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Co-Extrusion Cast Film Machine Expo Advertisement Unlock Next-Level Film Production at Co-Extrusion Cast Film Machine Expo 2025! The ultimate hub for packaging, industrial, and flexible film professionals—don’t miss out! Live Demos: Witness cutting-edge co-extrusion machines (3-7 layers) deliver superior barrier  properties, high transparency, and energy efficiency. Connect & Collaborate: Meet 200+ global suppliers, engineers, and buyers to source equipment,  share tech insights, and seal partnerships. Expert Talks: Learn from industry leaders about trends in sustainable film production, cost  optimization, and smart manufacturing integration

Co-Extrusion Cast Film Machine Expo Advertisement Unlock Next-Level Film Production at Co-Extrusion Cast Film Machine Expo 2025! The ultimate hub for packaging, industrial, and flexible film professionals—don’t miss out! Live Demos: Witness cutting-edge co-extrusion machines (3-7 layers) deliver superior barrier  properties, high transparency, and energy efficiency. Connect & Collaborate: Meet 200+ global suppliers, engineers, and buyers to source equipment,  share tech insights, and seal partnerships. Expert Talks: Learn from industry leaders about trends in sustainable film production, cost  optimization, and smart manufacturing integration​  

  Welcome Booth No U219   Date 2025.09.02-09.04  

The future of the cast film production line and its improvements   The cast film production line plays a crucial role in the manufacturing industry, providing a wide range of films used in various applications such as packaging, agriculture, construction, and medical industries. With the increasing demand for high-quality films, the cast film production line is expected to witness significant growth and improvements in the coming years.   One of the key factors driving the growth of the cast film production line is the increasing demand for flexible packaging solutions. Flexible packaging offers several advantages such as lightweight, cost-effective, and customizable packaging solutions, making it a popular choice among manufacturers. As a result, the demand for cast films used in flexible packaging is expected to grow significantly, driving the growth of the cast film production line.   In addition to the increasing demand for flexible packaging solutions, advancements in technology are also driving the growth of the cast film production line. Manufacturers are constantly investing in research and development to improve the efficiency and quality of cast film production lines. For example, new technologies such as multi-layer extrusion and inline coating are being adopted to enhance the performance of cast film production lines, resulting in higher productivity and better film quality.   Moreover, the growing awareness about sustainable packaging solutions is also expected to drive the growth of the cast film production line. Consumers are becoming more conscious about the environmental impact of packaging materials, leading to an increasing demand for eco-friendly packaging solutions. As a result, manufacturers are focusing on developing cast films made from recyclable and biodegradable materials, further driving the growth of the cast film production line.   Despite the promising future of the cast film production line, there are still several challenges that need to be addressed to ensure its sustainable growth. One of the key challenges facing the cast film production line is the increasing competition from other packaging solutions such as rigid packaging and paper-based packaging. Manufacturers need to continuously innovate and improve their production processes to stay competitive in the market.   Another challenge facing the cast film production line is the fluctuating prices of raw materials. The cost of raw materials such as resins and additives can significantly impact the profitability of cast film production lines. Manufacturers need to closely monitor the prices of raw materials and implement cost-effective strategies to mitigate the impact of price fluctuations.   In conclusion, the cast film production line is expected to witness significant growth and improvements in the coming years, driven by the increasing demand for flexible packaging solutions, advancements in technology, and growing awareness about sustainable packaging solutions. However, manufacturers need to address challenges such as increasing competition and fluctuating raw material prices to ensure the sustainable growth of the cast film production line. By investing in research and development and adopting cost-effective strategies, manufacturers can capitalize on the opportunities offered by the growing demand for cast films in the packaging industry.

1. Common Plastic Types and Properties for Film Production Polyethylene (PE) Series LDPE (Low-Density Polyethylene): Density 0.91-0.94 g/cm³, melting point 105-115°C. It offers excellent flexibility and transparency and is commonly used in food packaging bags and agricultural mulch films. HDPE (High-Density Polyethylene): Density 0.941-0.97 g/cm³, melting point 120-130°C. It offers high mechanical strength and is suitable for garbage bags and industrial packaging films. LLDPE (Linear Low-Density Polyethylene): Through the introduction of short chain branches through a copolymerization process, LLDPE offers puncture resistance 3-5 times greater than LDPE. It is widely used in frozen food packaging and heavy-duty packaging films.   Polypropylene (PP): Density 0.89-0.91 g/cm³, melting point 160-170°C. It offers high-temperature stability (can withstand retorting at 120°C) and good barrier properties. It is commonly used in microwaveable lunch boxes and pharmaceutical packaging. BOPP (Biaxially Oriented Polypropylene): Through longitudinal and transverse stretching after extrusion, transparency is increased by 50%. It is used for cigarette packaging and label films. Polyvinyl Chloride (PVC) Rigid PVC (density 1.3-1.45 g/cm³) is made into a soft film by adding plasticizers. It has excellent flame retardancy and printability, but is gradually being replaced due to environmental concerns.   Polyester (PET) Density 1.38-1.40 g/cm³, melting point 255-260°C. BOPET film produced through a biaxial stretching process offers high strength (tensile strength > 200 MPa) and excellent gas barrier properties. It is used for LCD panel protective films and food vacuum packaging.   Nylon (PA) PA6/PA66: Melting point 215-265°C. Multilayer composite films produced through coextrusion have an oxygen transmission rate of <2 cm³/(m²·24h·0.1 MPa). They are used for vacuum packaging of meat and corrosion-resistant packaging of chemicals.   Biodegradable Materials PLA (polylactic acid): Made from fermented corn starch, it fully degrades in 6-12 months and is used for disposable tableware packaging and shopping bags. PBS (polybutylene succinate): With superior heat resistance to PLA (melting point 114°C), it is suitable for mulch films and medical dressing packaging. 2. The Role and Effect of Plastic Blending Complementary Performance PE + EVA (ethylene-vinyl acetate copolymer): When the EVA content is 15-20%, the film's low-temperature toughness increases by 300%, making it suitable for packaging frozen foods at -40°C. PP + POE (polyolefin elastomer): When the POE content is 5-8%, the impact strength increases by 2 times, making it suitable for cushioning packaging of electronic products.   Cost Optimization Recycled + virgin: Adding 30% recycled content to HDPE film reduces costs by 25% and maintains >80% mechanical properties. Filler Modification: Adding 20% calcium carbonate (particle size <5μm) increases film stiffness by 40%, making it suitable for express packaging bags.   Functional Enhancement PE + Masterbatch: Adding 0.5-2% titanium dioxide masterbatch, the light-blocking rate exceeds 99%, suitable for light-shielding pharmaceutical packaging. PP + Antistatic Agent: Adding 1-3% ethoxylated amine antistatic agent reduces the surface resistivity to 10⁹Ω, preventing dust absorption by electronic products due to static electricity.   Process Improvement Multi-layer Coextrusion Technology: Through a 3-7-layer composite structure (such as PE/EVOH/PE), oxygen barrier properties are increased by 1000 times, suitable for high-barrier food packaging. 3. Typical Applications and Industries Food Packaging Industry Liquid Milk Packaging: PE/aluminum foil/PET three-layer composite film, oxygen barrier rate <0.5 cm³/(m²·24h·0.1MPa), shelf life extended to 6 months. Snack Packaging: BOPP/CPP (unoriented polypropylene) two-layer film, heat seal strength >3N/15mm, prevents leakage.   Agricultural Sector Degradable Ground Film: PLA/PBS blended film completely degrades into CO₂ and water after 6 months, eliminating the pollution problem of traditional PE ground film. Greenhouse Film: EVA/LDPE co-extruded film, with light transmittance >90%, infrared rejection >70%, and 30% increased energy savings.   Industrial Applications Chemical Product Packaging: PA/PE five-layer co-extruded film, with puncture resistance >150N, capable of withstanding a 50kg drop. Electronic Component Packaging: PS/PE antistatic film, with a surface resistance of 10⁶-10⁸Ω, prevents electrostatic breakdown of precision components.   Medical Sector Sterile Packaging: PET/Al/PE seven-layer composite film, with a bacterial rejection rate >99.9999%, used for packaging infusion bags and surgical gowns. Medical Dressing: PP spunbond nonwoven fabric + PE breathable film, with a water vapor transmission rate >3000g/(m²·24h), promotes wound healing. 4. Suitable Industries and Equipment Selection Recommendations High Value-Added Industries Pharmaceutical Packaging: Requires an online defect detection system (0.01mm accuracy) and a cleanroom (ISO Class 7). Electronic Component Packaging: A three-layer co-extrusion system equipped with an electrostatic eliminator (ion air gun) is recommended.   Large-Scale Manufacturing Industries Express Logistics Packaging: An extruder with a width greater than 2000mm and an automatic winder system (speed ≥ 150m/min) is recommended. Agricultural Mulch Film: Requires a thickness control system (±2μm tolerance) and a waste film recovery device (recovery rate > 95%).   Environmentally Responsible Industries Biodegradable Materials: Requires a dedicated screw (compression ratio 2.5:1-3:1) and a low-temperature extrusion process (temperature < 180°C). Food Contact Materials: Equipment materials must comply with FDA/EU 10/2011 standards and be equipped with a nitrogen atmosphere protection system to prevent oxidative degradation. 5. Technology Development Trends Nanocomposite Technology: Adding 0.5-2% nano-montmorillonite improves the oxygen barrier properties of the film by 5-10 times. Intelligent Control: An online infrared spectroscopy detection system monitors film thickness and composition uniformity in real time. Green Manufacturing: Using supercritical CO₂ foaming technology, film density is reduced by 30% and carbon emissions by 45%.   Plastic extruders, through the deep integration of materials science and process control, can produce a variety of films with thicknesses ranging from 0.008mm to 0.3mm. They serve over 30 industries, from daily consumer goods to high-end manufacturing, and have become a core piece of equipment in the modern packaging industry. Baijia Mechanical Equipment (Huizhou) Co., Ltd is a professional manufacturer of cast film machinery. We have our own factories and technicians, mature mechanical technology and experience, the pursuit of continuous innovation, support customized non-standard machines, welcome to contact us.

Plastic Film Extrusion Process 1. Process Characteristics The plastic film extrusion process involves molten plastic and continuously forming it into a film through a die. It has the following core characteristics:   Continuous Production: The entire process from plasticization to forming is continuous, resulting in high production efficiency and suitability for large-scale manufacturing.   Efficient Forming: The rotating screw propels the melt through the die to form a uniform film, allowing for rapid adjustment of thickness and width.   Wide Material Compatibility: It supports a variety of thermoplastics, including polyethylene (PE), polypropylene (PP), and polyester (PET). Co-extrusion technology enables the production of multi-layer composite films, imparting special properties such as barrier properties and heat resistance.   Precise Thickness Control: Die designs (such as hanger-type and screw-distributing) combined with cooling roller shaping ensure uniform film thickness, with tolerances within ±0.01mm.   High Process Flexibility: It can produce single-layer or multi-layer films, adapting to different material and product requirements by adjusting parameters such as screw speed and temperature. 2. Production Machine Types Single-Screw Extruder: Structure: Consists of a screw, barrel, hopper, die, and drive system. Application: Suitable for extruding general-purpose plastics (such as PE and PP). Low cost and simple operation, it is widely used in food packaging, agricultural mulch, and other fields.   Twin-Screw Extruder: Advantages: The intermeshing screw design enhances mixing, reduces material residence time, and prevents degradation of heat-sensitive materials. Application: Suitable for the production of highly filled, high-viscosity materials (such as PEEK films containing nanofillers), or engineering plastic films that require blending and modification.   Multi-Layer Coextrusion Equipment: Structure: Multiple extruders connected to a single die create a multilayer structure through layered coextrusion. Application: Produces barrier composite films (such as PP/ADH/EVOH/ADH/PP) for food and pharmaceutical packaging to extend shelf life.   3. Key Component Materials Screw and Barrel: Material: High-strength, corrosion-resistant alloy steel (such as 38CrMoAlA), with a hard chrome plating or nitriding treatment for improved wear resistance and service life. Design: The screw length-to-diameter ratio (L/D) is typically 20:1 to 30:1, ensuring sufficient plasticization of the material. The barrel is heated in sections, with a temperature control accuracy of ±1°C.   Die: Material: A combination of an alloy steel inner sleeve (such as 42CrMo) and a carbon steel outer sleeve. The die lip features an adjustable elastic structure to ensure flow uniformity. Type: A coat hanger die is suitable for wide-width films, while a screw distributor die is suitable for multi-layer coextrusion.   Chiller Roller: Material: Carbon steel with a hard chrome plating and internal circulating water cooling. Roller diameters range from 400mm to 1000mm, with a line speed of up to 60m/min.   Draw-Up and Winding Device: Draw-Up Roller: A combination of a rubber pressure roller and a metal roller provides constant tension (±0.5N) to prevent film stretching and deformation. Winder: Utilizes constant tension control technology, supports automatic roll changing, length measurement alarms, and achieves a roll flatness error of ≤1mm. 4. Applications Packaging Industry: Food Packaging: PE film is used for plastic wrap and shopping bags; multi-layer co-extruded films (such as PA/PE) are used for vacuum packaging to block oxygen and moisture. Industrial Packaging: PP film is used for moisture-proof packaging of electronic products, and PET film is used for metallized coating to enhance product gloss.   Agriculture: Ground Film and Greenhouse Film: LDPE film is used for covering farmland, providing insulation and moisture retention; EVA greenhouse film has a high light transmittance (≥90%), promoting crop growth.   Medical: Medical Film: Polycaprolactone (PCL)-based films are biodegradable and are used for radiotherapy positioning films, capable of being reshaped over 20 times.   High-End Industry: New Energy: PEI/PSF composite films are used for fuel cell separators, offering chemical resistance and excellent conductivity. Aerospace: Polyimide (PI) films are resistant to high temperatures (≥400°C) and are used as insulation materials to ensure safe equipment operation.   5. Industry Trends With technological advancements, plastic film extrusion processes are evolving toward higher performance and greater multifunctionality. For example, nanofiller modification improves film thermal conductivity (for example, PEEK film has a thermal conductivity of 2.18 W/(m·K)). Plasma treatment enhances surface energy and improves printability. In the future, as environmental protection requirements increase, research on the environmental response mechanisms of controlled-degradable films (such as PLA) will become a key focus, driving the sustainable development of the industry.

Plastic extrusion machines are industrial equipment designed to melt, shape, and solidify plastic materials into continuous profiles or semi-finished products.  1. The process involves Heating: Plastic pellets or powder are fed into a barrel and heated to a molten state. Shearing & Mixing: A rotating screw applies pressure and shear force to homogenize the melt. Shaping: The molten plastic is forced through a die to form the desired cross-section (e.g., pipe, sheet, film). Cooling: The extruded profile is cooled (via air or water) to solidify its shape.   2. Types of Plastic Extrusion Machines Single-Screw Extruder Appearance：Cylindrical barrel with a single helical screw; compact, horizontal design. Key Features： Simple structure, low cost. Suitable for PVC, PE, PP pipes/sheets. Limited mixing capability.   Twin-Screw Extruder Appearance：Parallel or conical barrels with two intermeshing screws; larger footprint. Key Features： Superior mixing/venting for filled plastics (e.g., wood-plastic composites). Higher energy consumption. Used for PVC profiles, masterbatch production.   Flat Extruder Appearance：Rectangular die head for producing flat sheets or films; vertical/horizontal options. Key Features： High output for plastic films (e.g., packaging, agricultural film). Requires precise temperature control.   Pipe Extruder Appearance：Specialized die for circular pipes; often paired with vacuum sizing tanks. Key Features： Produces pipes for water supply, drainage, or cables. Requires mold customization for different diameters.   Co-Extruder Appearance：Multiple extruders feeding into a single die for layered structures. Key Features： Creates multi-layer products (e.g., waterproof films, food packaging). Complex die design.   3. Material Characteristics Barrel & Screw: Made of high-strength alloy steel (e.g., 38CrMoAlA) with nitriding treatment for wear resistance. Screw geometry varies (e.g., metering, compression zones) to optimize plasticizing efficiency.   Die Head: Precision-machined from stainless steel or chrome-plated steel to ensure uniform flow. Modular designs allow quick die changes for different profiles. Heating/Cooling System: Electric heaters (band or ceramic) provide rapid temperature control (±1°C accuracy). Water or air cooling channels prevent overheating of sensitive materials. 4. Application Scenarios Construction: PVC Windows/Doors: Twin-screw extruders produce multi-chamber profiles for thermal insulation. PE Water Pipes: Single-screw extruders with vacuum sizing ensure dimensional stability.   Packaging: BOPP Films: Flat extruders with T-dies create transparent films for food packaging. Multi-Layer Barrier Films: Co-extruders combine EVOH/PA layers for oxygen resistance.   Automotive: PP Interior Panels: Single-screw extruders with calenders produce textured surfaces. PA Fuel Lines: Twin-screw extruders handle high-temperature, chemical-resistant materials.   Agriculture: PE Greenhouse Films: Flat extruders with UV stabilizers extend film lifespan. Drip Irrigation Tapes: Micro-extruders produce thin-walled tubes with precise hole spacing.   5. Selection Guide for Buyers Material Compatibility: For heat-sensitive materials (e.g., PVC), choose a twin-screw extruder with better venting.   Output Requirements: High-volume pipe production favors single-screw machines with large screw diameters (e.g., Φ120mm).   Budget Constraints: Single-screw extruders cost 30–50% less than twin-screw models but offer lower mixing quality.   Future Scalability: Modular co-extruders allow easy upgrades for multi-layer products as demand grows. 6. Industry Trends Energy Efficiency: Newer models adopt servo-driven screws and heat recovery systems to reduce power consumption by 20–30%.   Smart Manufacturing: IoT-enabled extruders monitor screw speed, melt pressure, and die temperature in real time for process optimization. Sustainability: Biodegradable plastics (e.g., PLA) require specialized screws with lower shear rates to prevent degradation.

Plastic extruder is the core equipment in the field of plastic processing. Through the rotation of the screw, the plastic raw materials (granules or powders) are melted and plasticized in the heating barrel, and continuously extruded into products with the required cross-sectional shape through the mold. Its essence is an integrated process of "melting-conveying-molding", which is widely used in the production of pipes, films, plates, profiles, etc.   1.Type classification and structural characteristics 1. Classification by the number of screws Single screw extruder Structure: It consists of a single screw, barrel, heating and cooling system, transmission system and mold. The screw is divided into a feeding section, a compression section and a metering section, and the material is compressed by changing the depth of the screw groove. Advantages: Simple structure, low cost, easy maintenance, suitable for extrusion molding of a single plastic. Application: Production of conventional products such as PVC pipes, PE films, PP sheets, etc.   Twin screw extruder Structure: Two screws rotate in parallel or meshing, the barrel is divided into closed type and slotted type, and is equipped with a side feeding system. Advantages: Good mixing effect, uniform plasticization, strong exhaust capacity, and can handle fillers or recycled materials. Application: production of complex formulas such as wood-plastic composite materials, high-filling masterbatch, modified plastics, etc.   Multi-screw extruder Structure: the number of screws ≥3, usually used for special processes (such as reactive extrusion). Advantages: high shear, high dispersion, suitable for materials that require fast response (such as TPU, silicone rubber). 2. Classification by process direction Flat extrusion and flat blowing (film extrusion): extruding tubular blanks through a ring die, and forming a film after blowing and cooling. Flat extrusion and blowing up (pipe extrusion): the material is extruded vertically upward, cooled and formed by a vacuum sizing sleeve, suitable for large-diameter pipes. Flat extrusion and blowing down (drip irrigation belt extrusion): the material is extruded downward and directly enters the water tank for cooling, suitable for thin-walled products.   3. Core structure analysis Extrusion system: Screw: determines the plasticizing capacity, the larger the diameter, the higher the output (common diameter range 30-200mm). Barrel: lined with wear-resistant alloy layer, segmented heating (resistance heating or electromagnetic induction heating), temperature control accuracy ±1℃. Transmission system: Use DC or AC variable frequency motor, reduce speed through gearbox, and realize stepless adjustment of screw speed (0-120rpm). Heating and cooling system: Heating: zone control (usually 3-5 zones), total power ranges from 10kW to 200kW depending on the model. Cooling: air cooling or water cooling, quickly remove the waste heat generated by screw shearing to prevent material decomposition. Mold design: Flow channel structure: adopt diverter shuttle design to ensure uniform distribution of materials and reduce welding marks. Forming sleeve: vacuum adsorption or water cooling shaping to control product size accuracy (tolerance ±0.1mm).   4. Comparison of type advantages Single screw Advantages: low cost, easy operation Limitations: weak mixing ability, not suitable for high filling formula   Twin screw Advantages: uniform plasticization, good exhaust Limitations: complex structure, high maintenance cost   Flat extrusion and blowing Advantages: suitable for large-diameter pipes, high cooling efficiency Limitations: large equipment footprint   Flat extrusion and blowing Advantages: good thin-walled product molding, fast production speed Limitations: high mold precision requirements 5. Application scenario expansion Construction field: Extrusion of PVC door and window profiles, PP-R water supply pipes, PE-RT floor heating pipes to meet the needs of energy-saving buildings. Packaging industry: Production of BOPP film (biaxially oriented polypropylene), PE cling film, and PET strapping tape, with an annual output accounting for more than 30% of global plastic products. Agriculture field: Manufacturing drip irrigation tapes, agricultural films, and greenhouse frames to promote the development of water-saving agriculture and facility agriculture. Emerging fields: 3D printing filaments: Production of PLA, ABS and other consumables through single screw extruders, with a diameter accuracy of ±0.05mm. Biodegradable materials: extruded PBAT/PLA blended modified pellets for degradable shopping bags and ground films.   6. Technology development trends High efficiency and energy saving: electromagnetic heating technology is used to reduce energy consumption by 30% and increase temperature response speed by 50%. Intelligent control: integrated PLC+touch screen system to achieve real-time monitoring and automatic adjustment of temperature, pressure and speed. Modular design: by replacing the screw combination or mold, the product type can be quickly switched to meet the needs of small batch customization.

Cast film forming equipment (casting machine) is mainly used in the fields of casting film product forming, casting material formula development, casting material performance research, etc., such as conveying materials to the casting machine to take cast film products. During use, the speed of the casting roller and the traction roller can be controlled by the servo motor, so that the material conveying speed can be adjusted to produce various sheet products that meet user requirements.   Cast film has excellent heat sealing performance and excellent transparency. It is one of the main packaging composite substrates and is used to produce high-temperature cooking film, vacuum aluminum film, etc.   And the extruded cast film can be processed by subsequent stretching process to produce uniaxial and biaxial stretch films, breathable and impermeable films, and heat shrinkable films. It is the fastest-growing film forming technology in recent years.   The plastic materials commonly used to produce films by extrusion cast film method are mainly LDPE, LLDPE, EVA, PP, PET, PA, etc. Cast film production Film extrusion molding is the first step in producing ready-to-use packaging materials. Extrusion processes have always been the basis for efficient printing and bag making, and therefore the basic prerequisite for producing high-quality products. Typical cast film production line applications include stretch film, CPP film or barrier film, which can achieve high productivity and stable quality. The machines are equipped with intelligent control systems to ensure the production quality of the film, monitor details at any time, and achieve worry-free production.   PARKnSHOP can provide the right machine according to your specific production needs: from basic solutions for standard products to customizable solutions for the production of demanding products. With our latest mechanical technology for cast film extrusion lines, we are happy to support you and help you create the ideal machine to meet your specific needs. Welcome to contact us for consultation!

Cast Film Extrusion is a process that extrude molten polymer onto the surface of a high-speed cooling roller through a vertical slit die to form a uniform film.   1. Core operating mode of the machine Melt extrusion: The polymer particles are heated and melted by a single-screw or twin-screw extruder and transported to the die through the rotation of the screw. Die design: A vertical slit die is used to ensure uniform distribution of the melt and form a molten film with controllable thickness. Cooling and shaping: The melt is fixed on the surface of a high-speed rotating cooling roller through an air knife or a vacuum box to achieve rapid quenching and improve the transparency and mechanical properties of the film. Thickness control: The subsequent cooling roller, traction roller and embossing roller further adjust the film thickness, and finally the finished product is obtained by trimming and winding. 2. Machine data characteristics Multi-layer co-extrusion capability: High-end equipment supports 5-11 layers of co-extrusion, adapts to special materials such as PA and EVOH, and improves barrier properties. Production speed and width: The maximum production speed is 500 meters/minute, the net width can reach 2 meters, and the annual output exceeds 4,000 tons. Thickness accuracy: Thickness deviation ≤±5%, real-time monitoring through online thickness measurement system to ensure product consistency. Temperature control: Equipped with intelligent temperature control system, the temperature of the cooling roller can be accurate to ±1℃, which can meet the processing requirements of different materials.   3. Machine production and material characteristics Material adaptability: It can process a variety of materials such as PP, PE, TPE, EVA, CPE, etc., and supports single-layer or multi-layer composite structures. Special material adaptation: PA (nylon) improves barrier properties, EVOH (ethylene-vinyl alcohol copolymer) enhances oxygen barrier properties.   Product structure: The thickness range of single-layer film is 0.01-0.06 mm, and the thickness of multi-layer composite film can reach 0.2 mm. Surface treatment: Support corona treatment, embossing and other processes to improve printing adhesion or anti-slip performance.   Production efficiency: The edge material recovery rate is ≤10%, and the edge material is re-introduced into the main extruder through the automatic grinding system to reduce raw material loss. 4. Production advantages Superior performance: The film has high transparency, uniform thickness, and mechanical properties (such as tensile strength and tear strength) are better than those of blown film. Excellent barrier properties: The multi-layer co-extrusion structure can achieve an oxygen permeability of ≤1 cc/(m²·24h·atm). Cost-effectiveness: The raw material utilization rate is high, the edge material recovery system reduces waste, and the overall cost is reduced by 15%-20%. High production efficiency, the annual output of a single line can reach 4,000 tons, meeting the needs of large-scale production. Environmental protection: Some equipment supports low-smoke zero-halogen (LSZH) material processing, which reduces the release of toxic gases during combustion. The edge material recovery system meets the requirements of sustainable development and reduces carbon emissions. 5. Application scenarios Food packaging: High barrier films are used for meat and dairy product packaging to extend the shelf life. Example: Multi-layer co-extruded CPP film is used for potato chip bags to block oxygen and moisture. Medical supplies: Medical surgical gowns, disposable sheets, sanitary napkins and other sanitary products rely on its sterility and flexibility. Industrial packaging: Machine dust covers, air conditioner covers, copier covers, etc. need to be dust and moisture proof. Special fields: Applications that require strong weather resistance, such as solar cell back panels and agricultural mulch films.

Cast film extrusion equipment processes polymer materials (such as PE, PP, TPU, EVA, etc.) into high-precision films through melt extrusion and roller cold forming processes.   1. Technical features Multi-layer co-extrusion technology: supports 3-11 layer composite structures, and achieves precise compounding of different materials (such as PA, EVOH) through independent temperature control extruder and dispenser system, improving the barrier properties, mechanical strength and other properties of the film. High-precision thickness control: Using T-type die head and online thickness gauge, combined with closed-loop feedback system, the uniformity of film thickness can reach within ±1.5%, meeting the strict requirements of high-end packaging for thickness consistency. High-efficiency and energy-saving design: equipped with low-shear screw and intelligent temperature control system, melt temperature fluctuation ≤2℃, energy consumption is reduced by 15%-20% compared with traditional equipment. High-speed production capacity: Line speed can reach 100-250m/min, and single-line production capacity can reach up to 600kg/h. Taking PE breathable film as an example, the daily output of a 1.6-meter wide production line can reach 8 tons. 2. Production advantages and data support Wide material adaptability: Can process more than 20 materials such as PE, PP, TPU, EVA, PLA, etc., and support single-layer to 11-layer composite structures. Special material processing: Through the design of short 3D melt channel and floating layer, the processing problems of high melting point materials such as PA and EVOH are solved, and the scrap rate is reduced to less than 5%. High process flexibility: Support online stretching (MDO unit): achieve a longitudinal stretching ratio of 1:3-1:6 for the film, and improve the stiffness and barrier properties of the film. For example, a 3-layer zebra-patterned cast line can produce agricultural mulch with an MD tensile strength of ≥50MPa. Surface treatment function: integrated corona and coating units to meet post-processing requirements such as printing and lamination. Automation and intelligence: Equipped with Siemens PLC control system and touch screen human-machine interface, it can realize real-time monitoring and adjustment of parameters such as temperature, speed, tension, etc. Intelligent winding system: adopts a fully automatic turret structure, supports surface, center, and gap winding, and the roll change time is ≤15 seconds, reducing downtime losses.   3. Core application scenarios Food packaging: High barrier cast film: used for food packaging that needs long-term preservation such as meat and cheese, with an oxygen permeability of ≤2cm³/(m²·24h·0.1MPa). Cooking packaging film: resistant to high-temperature cooking at 121℃, suitable for convenience foods, self-heating rice, etc. Medical and health: Breathable film: water vapor permeability (WVTR) reaches 3000-8000g/(m²·24h), used for baby diapers, medical sheets, etc. Antibacterial film: by adding nano silver ions, an antibacterial rate of 99.9% is achieved to meet the needs of medical supplies such as surgical gowns and masks. Industry and agriculture: Agricultural mulch: adding photodegradation agents to achieve natural degradation in 180 days and reduce soil pollution. Electronic product packaging: anti-static current cast film (surface resistance 10⁶-10⁹Ω), protect precision components from static damage. Daily necessities: Raincoats, gloves and other waterproof products: use TPU cast film, tensile strength ≥40MPa, tear strength ≥80N/mm. Home decoration film: can produce matte, glossy, wood grain and other surface effects, replacing traditional PVC film. 4. Key factors in purchasing decisions Equipment configuration selection: Layer requirements: 3-5 layers of equipment are suitable for general packaging, and 7 layers or more are used for special functional films such as high barrier and breathable. Width and capacity: Select the production line width (1200-3000mm) according to the target market. Buyers with a daily output demand of 5-10 tons are recommended to choose equipment with a width of more than 2000mm. Brand and certification: Give priority to brands that have passed CE and ISO9001 certification to ensure equipment stability and after-sales service.   5. Industry trends and purchasing suggestions Greening: With the advancement of the "dual carbon" policy, you can pay attention to equipment equipped with waste heat recovery and energy-saving motors when purchasing to reduce long-term operating costs. Intelligence: Choose equipment that supports the Industrial Internet to achieve remote monitoring and predictive maintenance and reduce unplanned downtime. Customization: For special application scenarios (such as degradable materials and functional coatings), jointly develop customized solutions with suppliers.   Baijia Mechanical Equipment (Huizhou) Co., Ltd. is a factory specializing in the manufacture of cast film machinery. It can customize non-standard machinery to meet your specifications. The quality is guaranteed. Welcome to consult.

The equipment for producing cast film is called cast film extruder. The equipment of different production lines is distinguished by different raw materials and production configurations, but the machine principle and structure are similar. It mainly includes extruder, die head, cooling roller, traction roller, winding device, trimming and recycling system, etc. Extruder Function: Heat and melt the plastic raw materials to provide uniform melt for the subsequent casting process. Type: Cast film generally uses a single screw extruder. Different plastic raw materials are suitable for different screw parameters. For example, the screw for polypropylene has a diameter of 90-200mm, an aspect ratio (L/D) of 25-33, a compression ratio (ε) of 3.5-4, a sudden change structure, and can be equipped with a mixing head; the screw for polyethylene has a diameter of 90-150mm, L/D = 25-28, ε = 3.0, and a metering structure.   Die head Function: Make the melt flow out evenly to form a sheet-like melt flow of a certain width and thickness. It is a key equipment for producing wide-width films. Type and specification: The die head of polypropylene cast film can be branch pipe type or hanger type. The die head width has several specifications of 1.3m, 2.4m, 3.3m, and 4.2m. The length of the straight part of the die is L=(50~80)t (t is the film thickness), and the larger value is taken when the film thickness is small; the die lip opening is 0.3~0.5mm, and the smaller value is taken when the thickness is large. Polyamide cast film mostly uses a branch pipe die head, and the length of the die lip shaping section should be appropriately longer than that of CPP. Polyethylene cast film mostly uses a branch pipe structure, with a branch pipe diameter of 30~50mm and a die lip gap of 0.3~1.0mm. Cooling roller Function: Rapidly cool and solidify the melt extruded from the die head, which helps the film maintain the required dimensional stability and physical properties. Specifications and features: The polyethylene and CPP film casting cooling roller is a relatively large diameter steel roller with a diameter of 400~1000mm, and the larger value is taken as the die head width increases. The roller surface is hard chrome plated and polished to mirror finish. The roller is a double spiral cooling tube, which is cooled by cooling water. There are two double-sided cooling rollers, which are used to further cool the two surfaces of the film. They are smaller than the cast cooling rollers and have a diameter of 150~300mm. The cooling of polyamide cast film is different from that of CPP film. It is divided into two steps. The cast roller is an oil cooling roller. Hot oil is passed through the roller. The temperature of the hot roller is 90~100℃, which is lower than the temperature of the cast film. Then the water cooling roller is used to cool the film to room temperature.   Pulling roller Function: Pull out the cooled and solidified film smoothly, control the conveying speed of the film, and ensure the stable operation of the film during the production process.   Winding device Function: Collect the pulled film and roll it into a roll to form a continuous film coil for easy storage and transportation.   Edge trimming and recycling system Function: Remove the excess part of the edge of the film, determine the width of the film, and recycle the cut edge material to achieve resource reuse.

Definitions & Core Technologies Stretch Film Production Machine This machine produces stretch film (e.g., LLDPE-based cling film) via a blown film extrusion process. The polymer resin is melted, extruded through a circular die, and inflated into a bubble, which is then cooled, collapsed, and wound into rolls.   Cast Film Machine This machine produces cast film (e.g., BOPP, CPP, or cast polyethylene) via a cast extrusion process. The molten polymer is extruded through a flat die, chilled on a cooling roll, and wound into rolls.   Machine Principle Principle of Stretch Film Production Machine Stretch film production machine is mainly used to produce unidirectional or bidirectional stretched polyethylene (PE) film. Its core processes include: Extrusion molding: Polyethylene particles are heated and melted, and extruded through a flat die to form a wide and thin plastic sheet. Cooling and solidification: The plastic sheet is rapidly cooled by a cooling roller or air cooling system to form a semi-solid thick sheet. Longitudinal stretching (MDO): After the thick film is heated by the preheating roller, it is stretched longitudinally by multiple sets of stretching rollers to give the film longitudinal strength and elasticity. Transverse stretching (TDO, optional): Some machines are equipped with a transverse stretching device, which fixes the edge of the film by a clamp and stretches it to achieve bidirectional stretching. Heat setting and winding: The stretched film is set at high temperature to eliminate internal stress and finally wound into a large roll. Principle of film casting machine (casting machine) Film casting machine (casting machine) is mainly used to produce films such as cast polypropylene (CPP) and biaxially oriented polypropylene (BOPP). Its core processes include: Extrusion molding: The polymer particles are heated and melted, and extruded through a flat die to form a wide and thin melt. Casting cooling: The melt is directly cast onto the cooling roller and solidified by rapid cooling to form a transparent film. Traction and winding: After the film is stretched by the traction roller, it is wound into a large roll.   Application Scenarios Stretch Film Machine Packaging: Pallet wrapping, unitization, and bundling (e.g., logistics, food, agriculture). Industries: Logistics (70% market share), agriculture (silage wrap), and retail (bundle wrapping). Cast Film Machine Packaging: Food packaging (e.g., snack bags, laminates), labels, and medical films.Then the Flexible Packaging Cast Film Line can meet your production needs. Industries: Food (40% market), pharmaceuticals (25%), and electronics (15%). Example: A BOPP cast film line produces 20 μm film at 400 m/min with 95% transparency for high-end packaging.   Advantage Comparison Stretch Film Strengths: High stretchability reduces material costs (50% less film vs. manual wrapping). Excellent cling and puncture resistance for heavy loads. Weaknesses: Lower optical clarity (haze >15%) limits use in transparent packaging. Thickness variability affects printability.   Cast Film Strengths: Superior optics (haze <5%) and printability ,High Transparent Film Machine for premium packaging. Higher production speeds (up to 500 m/min) and energy efficiency. Weaknesses: Lower stretchability (not suitable for pallet wrapping). Higher initial investment (1–5Mvs.0.5–2M for stretch film lines).   Decision Factors for Buyers Choose Stretch Film If: Prioritizing cost savings in logistics/warehousing. Packaging irregular or heavy loads (e.g., building materials).   Choose Cast Film If: Requirering high-visibility packaging (e.g., consumer goods). Targeting high-speed production (e.g., FMCG industries).

Film extrusion technology: the key to unlocking efficient production in multiple industries As one of the core processes of modern plastic processing, film extrusion technology pushes the molten material in the heated barrel through the screw, and is formed into a continuous film through the mold. It is widely used in food packaging, industrial manufacturing, agricultural covering and other fields. As a high-tech enterprise deeply engaged in the field of cast film extrusion machinery, we provide customized solutions for global customers based on mature processes and innovative technologies.   Industry applications and standard differences of film extrusion machinery Food and pharmaceutical packaging industry Film extrusion machinery is the core production equipment for food packaging bags and pharmaceutical aluminum-plastic composite films. The industry has extremely high requirements for the hygiene standards and material compatibility of machinery. For example, when producing pharmaceutical-grade PVC/PE composite films, a twin-screw extruder is required to ensure that the materials are evenly mixed and there is no residual contamination. Our equipment is ISO 9001 certified, equipped with a fully enclosed hopper and online cleaning system, and meets GMP specifications. Agricultural covering film field Agricultural ground film and greenhouse film must have high strength, weather resistance and light transmittance. The industry has strict requirements on the tolerance of film thickness, which usually needs to be controlled within ±3%. We use high-precision thickness gauges and multi-zone temperature control systems, combined with three-layer co-extrusion technology, to produce EVA/POE/LDPE composite films, significantly improving anti-aging performance.   Construction and industrial materials industry The production of waterproof rolls and thermal insulation films needs to deal with high-temperature and high-viscosity materials. Such machinery needs to be equipped with high-torque transmission boxes and wear-resistant screws to adapt to the processing of crystalline materials such as PP and PET. Our equipment uses nitrided screws and double cooling rollers to ensure uniform crystallinity of the sheet and increase tensile strength by more than 20%.   Electronics and medical industries Electronic component packaging films and medical protective films have strict requirements on cleanliness and dimensional stability. For example, when producing lithium battery separators, slit dies and electrostatic adsorption technology are required to ensure that the film thickness deviation is less than ±1μm. Our equipment is equipped with a laser diameter gauge and a closed-loop control system, which can achieve 0.01mm precision adjustment.   Technological innovation and process advantages As a professional manufacturer, we have a modern factory equipped with an independent R&D laboratory and a fully automatic production line. Core products include High-speed cast film machine: The maximum line speed of Auto-casting Film Machine is 400m/min, which is suitable for CPP, CPE and other materials; Multi-layer co-extrusion cast film machine: Multi-layer Cast Film Line supports 3-5 layers of composite structure to meet the high barrier requirements in the food and medical fields; Intelligent control system: The whole machine adopts PLC automatic control, equipped with human-machine interface, real-time optimization of screw speed, extrusion pressure and cooling temperature, reducing energy consumption by 15%.   Cooperation cases and customer value Food packaging companies: Food groups use our equipment to produce degradable PLA films, with a 40% increase in production capacity and a scrap rate of less than 0.5%;   Agricultural cooperatives: The weather-resistant mulch film production line customized for agricultural enterprises has increased crop yields by 18% and a film recovery rate of 90%;   Medical companies: The clean-grade cast film machine provided to medical device companies has passed ISO 13485 certification, and the product defect rate is less than 0.1%.   Looking to the future: Continuous innovation to build a sustainable future We are always customer-oriented and committed to developing more efficient and environmentally friendly film extrusion technology. Whether it is the lightweight demand for food packaging or the degradation upgrade of agricultural covering film, our team can provide full-process support from equipment selection to process optimization.   Our technical team is composed of senior engineers and holds multiple patents for Cast Film Machine. Welcome to contact us to explore the infinite possibilities of film extrusion technology together!

1. Differences between machines and processes Process principle Film casting: Liquid plastic solution is applied to the surface of the carrier, and a film is formed by solvent evaporation or cooling solidification. Typical equipment such as multi-layer co-extrusion high-speed cast film machinery uses a precision extrusion system and a cast roller group to stably form in a low temperature environment below 80°C.   Cast film (calendered film): The molten plastic is extruded through the gap between the rollers of the calender, and the material is subjected to stretching and shearing forces during the process. The equipment must be equipped with a high-precision roller gap control system to ensure the uniformity of the film thickness (for example, the thickness deviation of the barrier film produced by the cast film method can be controlled within 3%).   Equipment structure Film casting equipment: The core components include extruder, cast roller, cooling system and traction device. Taking the 16-meter wide production line as an example, it uses a modular winder and an industrial Internet platform to achieve remote monitoring and fault prediction.   Cast film equipment: Taking the 5-layer co-extrusion production line as an example, its key technology lies in the high-precision quantitative feeding system and online recycling device, which can process raw materials such as LDPE and PP and produce films with a thickness of 6-7μm.   2. Comparison of performance and application scenarios Physical properties Cast film: The molecular structure is not damaged by stretching, the weather resistance is excellent (warranty period is 5-7 years), the thickness uniformity is high (such as the optical film thickness deviation ≤3%), but the color selection is limited (such as the thickness of the casting grade color change film color card is 4.5μm).   Cast film: Due to extrusion and stretching, the internal stress causes easy retraction, but it can achieve complex structures (such as multi-layer co-extruded film with ≥3 layers), and the thickness range is wider (6-7μm to hundreds of microns).   3. Application fields Cast film: Optical field: AR glasses polarizer holographic optical waveguide (PVG) technology adopts casting process, and the light efficiency is improved by 300%. Medical packaging: For example, the medical three-layer co-extruded film produced by Renolite is used for large infusion bags to meet biocompatibility requirements. Cast film: Food packaging: For example, Saudi Basel LDPE 2427K casting film raw material is used for food packaging film, with excellent heat sealing performance. Industrial materials: such as PP Formosa 2100M CPP cast film, which is used for electroplating laminated film, with good electroplating and excellent transparency.   4. Buyer demand matching Cast film equipment: suitable for scenes with high requirements for weather resistance and thickness uniformity, such as optical film and long-term outdoor advertising film. For example, the optical film for AR glasses developed by Southeast University uses a cast film process to increase the refractive index modulation by 6-10 times. Cast film equipment: suitable for high production capacity and low cost requirements, such as a 1.6-meter-wide cast film production line with a daily production capacity of 20 tons, suitable for food packaging, stretch film, etc. Cost and efficiency Cast film: The equipment investment is relatively high (such as the industrial Internet platform of Shicheng Machinery requires additional investment), but the raw material utilization rate is high (such as the recyclability of polypropylene cast film is 100%), and the long-term operating cost is low. Cast film: The equipment investment is relatively low (such as the equipment investment of the blowing production line is small), but the raw material loss is high (such as the fixed waste loss caused by the pressure surplus and the extrusion tail). 5. Technical barriers Cast film: Need to master core technologies such as material modification (such as liquid crystal composite formula) and interference exposure, suitable for enterprises cooperating with scientific research institutions. Cast film: The technical threshold is relatively low, but the problem of internal stress release needs to be solved (such as the need to feed the film to avoid bubbling during calendering film installation), suitable for mature manufacturing companies.   6. Future trends Cast film: Transformation towards intelligence and greenness. Cast film: Development towards high precision and wide width to meet high-end needs such as battery separators for new energy vehicles.

The sanitary material cast film machine is a professional equipment used to produce films for medical and sanitary products. Through melt extrusion and cast film molding processes, polymer materials are made into uniform and transparent films.   Hygienic Material Cast Film Machine Technical parameters Extrusion capacity: output 180-250kg/h, suitable for medical-grade raw materials such as LDPE, LLDPE, MDPE, etc. Film specifications: width ≤2100mm, thickness 0.01-0.5mm, meeting the diversified needs of surgical gowns, masks and other products. Operation efficiency: Line speed 30-80m/min, support continuous production, reduce downtime. Performance advantages: High-precision molding: using adjustable die head to ensure that the uniformity error of film thickness is ≤±3%, reducing the defective rate. Energy-saving design: servo motor and PLC control system optimize energy consumption, saving 15%-20% energy compared with traditional models. Hygiene standards: fully enclosed production environment, equipped with air purification system, cleanliness reaches ISO 7 level, avoiding secondary pollution. Typical application scenarios Medical protection field: Medical masks: The outer layer of non-woven fabric is compounded with cast film to improve waterproofness and breathability, meeting EN 14683 standards. Protective clothing: Produce high-barrier TPU cast film, which is used in the core part of protective clothing, blocking virus penetration rate ≥ 99.9%. Sanitary products industry: Diapers: PE cast film is used as the base film, the leakage-proof performance is improved by 40%, and the incidence of infantile diaper rash is reduced. Sanitary napkins: The surface of the permeable cast film has a water vapor permeability of 2000g/m²·24h, which improves comfort. Food packaging field: Fresh packaging: Produce high-oxygen barrier EVOH cast film to extend the shelf life of food by 3-5 days. Pharmaceutical packaging: Medical-grade CPP film that meets FDA 21 CFR 177.1520 standards to ensure drug stability.   Cast Film Making Machine Maintenance and Care Daily Cleaning: Die Head Cleaning: After each shutdown, use a copper brush to remove residual materials from the die head to prevent coking products from affecting the quality of the film. Cooling Roller Maintenance: Wipe the surface of the cooling roller with alcohol every week to prevent scale accumulation and film surface defects. Regular Maintenance: Screw and barrel: Check the wear every 2000 hours of operation. If the gap exceeds 0.3mm, it needs to be replaced to prevent material degradation. Transmission System: Check the gearbox oil level and oil quality every month, and replace ISO VG 320 gear oil in time to reduce noise and energy consumption. Calibration and Debugging: Thickness Sensor: Calibrate once a quarter to ensure that the film thickness error is ≤±2% to avoid customer complaints. Tension Control: Adjust the rewinding and unwinding tension according to different materials to prevent the film from stretching, deformation or wrinkling.

Cast film machine is a device that extrude molten plastic resin onto a cooling roller and rapidly cool it to form a film. This process is called cast film extrusion. The film produced by cast film has the characteristics of high flatness, good transparency and low shrinkage.   Features Modern cast film machines are usually equipped with advanced online monitoring and control systems, which can collect and record a large amount of production data in real time, which is essential for quality control, process optimization and fault diagnosis. The main data-carrying features include:   Temperature data: Temperature of each zone of the extruder: Record the temperature of different areas of the extruder barrel to reflect the plasticization and melting state of the resin. Die head temperature: Record the temperature of each point of the die head, which affects the uniformity and surface quality of the film. Cooling roller temperature: Record the temperature of the surface of the cooling roller, which directly affects the cooling rate and crystallinity of the film, and then affects its physical properties. Ambient temperature and humidity: Record the ambient temperature and humidity of the production workshop, which may have an indirect impact on the performance of the film.   Pressure data: Extruder melt pressure: monitors the pressure of the molten resin inside the extruder, reflecting the stability of the extrusion process. Die head pressure: monitors the pressure distribution of the molten resin inside the die head, which helps to adjust the die lip opening and ensure the uniformity of the film thickness.   Speed ​​data: Extrusion screw speed: controls the extrusion amount of molten resin. Cooling roller speed: determines the traction speed of the film, and together with the extrusion amount determines the thickness of the film. Reeling speed: synchronized with the cooling roller speed to ensure the smooth reeling of the film.   Thickness data: Online thickness measurement: The thickness of the film is measured in real time by the sensor, and fed back to the control system for automatic adjustment. The thickness data at different positions can be recorded to evaluate the uniformity of the film thickness.   Tension data: Reeling tension: monitors the tension of the film during the traction process to avoid stretching deformation or breakage of the film. Reeling tension: controls the tension during the reeling process to ensure the flatness of the coil and avoid loose or over-tightening.   Current and energy consumption data: Monitor the current of each motor (such as extrusion motor, traction motor, winding motor) to reflect the operating load of the equipment. Record the energy consumption of the entire production line for cost control and energy efficiency analysis.   Alarm and fault data: Record various alarm information (such as overtemperature, abnormal pressure, motor overload, etc.) that occurs during the operation of the equipment, as well as the time and type of fault, to facilitate fault diagnosis and troubleshooting.   Material and process parameter data: Record the type, brand, batch and other information of the resin used. Record the set process parameters, such as extrusion temperature curve, cooling roller temperature setting, die lip opening setting, etc. The collection and analysis of these data help operators better understand the production process, discover and solve problems in a timely manner, optimize process parameters, and improve product quality and production efficiency. The data of modern cast film machines can usually be stored, exported and trend analyzed to provide support for intelligent production and management. Application fields Due to its excellent performance, cast film has a wide range of applications in many fields:   Food packaging: Cling Film: It is used for wrapping and preserving household and commercial food by taking advantage of its good self-adhesiveness and transparency. Stretch Film: It is used for bundling and fixing pallet cargo by taking advantage of its stretchability and self-adhesiveness, providing moisture-proof, dust-proof and stable protection. Composite film substrate: As the middle layer or surface layer of multi-layer composite packaging film, it provides barrier, printability and heat sealing functions.   Industrial packaging: Protective Film: It is used for surface protection of metal sheets, plastic sheets, glass and other products to prevent scratches and pollution. Release Film: It is used in the production process of tapes, labels, electronic components, etc. to provide peeling performance.   Agriculture: Agricultural film: It is used for greenhouse covering, ground film, etc., with functions such as light transmission, heat preservation and moisture retention.   Medical and health care: Medical dressing substrate: It is used as the substrate of medical tapes, surgical films, etc. Disposable protective equipment: such as protective clothing, isolation membrane, etc.   Electronic appliances: Insulation film: used for insulation of wires and cables, electronic components. Capacitor film: used as dielectric material of capacitors.   Other fields: Optical film: such as polarizer, brightening film, etc., used for display devices. Automotive industry: used for interior parts, protective film, etc. Building materials: used as waterproof film, sound insulation film, etc.   Maintenance In order to ensure the stable operation of the cast film machine and extend its service life, regular maintenance is essential. The main maintenance measures include:   Daily maintenance: Cleaning: Keep the machine and the surrounding environment clean, and regularly clean the residual materials and dust on the extruder, die head, cooling roller, traction roller, winding device and other parts. Inspection: Check the operating status of the equipment every day, including whether there is abnormal noise, vibration, leakage, etc. Check whether each connection part is loose, and tighten the bolts and joints. Lubrication: According to the requirements of the equipment manual, regularly add lubricating oil or grease to the parts that need lubrication (such as bearings, gearboxes, guide rails, etc.). Safety inspection: Check whether the safety protection devices are intact and reliable, such as emergency stop button, safety door, overload protection, etc.   Regular maintenance: Extruder maintenance: Regularly clean the accumulated materials in the screw and barrel, check the wear of the screw, and replace it if necessary. Check whether the heater and cooling system are operating normally. Die head maintenance: Regularly clean the accumulated materials in the die lip and flow channel, check the flatness and gap of the die lip, and adjust or repair it if necessary. Cooling roller maintenance: Regularly clean the surface of the cooling roller to maintain its finish and ensure good cooling effect. Check the bearings and seals of the cooling roller and replace them if necessary. Traction and winding device maintenance: Check the surface condition and pressure of the traction roller and the pressure roller, and clean the adhesion on the surface. Check the operation of the winding motor and the accuracy of the tension control system. Electrical system maintenance: Regularly check whether the connection of the electrical circuit is reliable and whether it is aging or damaged. Check whether the electrical components in the control cabinet are working properly, clean the dust, and ensure good heat dissipation. Hydraulic and pneumatic system maintenance (if any): Check the hydraulic oil level and quality, and replace the hydraulic oil and filter element regularly. Check whether the air circuit is leaking and whether the pneumatic components are working properly. Preventive maintenance:   Develop a maintenance plan: According to the frequency of use of the equipment and the manufacturer's recommendations, develop a detailed maintenance plan and cycle. Train operators: Provide professional training for operators to enable them to master the correct operating procedures and basic maintenance skills. Spare parts management: Establish a reasonable spare parts inventory to replace damaged parts in time and reduce downtime. Record maintenance: Record the content, time and execution personnel of each maintenance in detail to facilitate traceability and analysis.   Professional maintenance: For some complex maintenance work, such as overhaul of equipment and repair of precision parts, professional maintenance personnel should be carried out.

1. Definition and working principle of cast film machine Cast film machine is a special equipment that processes high molecular polymers (such as polypropylene PP, polyethylene PE, etc.) into films through melt extrusion process. Its core process is melt casting method:   Raw material melting: Plastic particles are heated and melted by extruder (temperature is usually 200-280℃). Cast molding: The melt is evenly extruded through the T-die head and quenched on the surface of the cooling roller (the temperature of the cooling roller can be as low as 0-10℃). Tractive winding: The film is flattened by the traction roller and then rolled to form a finished product. Compared with the traditional blown film process, the film produced by the cast film machine has the advantages of high thickness uniformity (error within ±2%), good transparency (light transmittance ≥92%), and high production efficiency (line speed can reach 300m/min).   2. Core features and data advantages Efficient production capacity Line speed: High-end models can reach 300m/min, and the daily output exceeds 50 tons (taking CPP film as an example, when the thickness is 25μm). Multi-layer co-extrusion technology: supports 3-7 layer composite structure, and the interlayer thickness control accuracy is ±1.5%. Excellent film performance Thickness range: 10-200μm, meeting different packaging needs. Physical properties: Tensile strength (longitudinal/transverse): ≥40MPa/≥25MPa Elongation at break: ≥400% Heat sealing strength: ≥8N/15mm   Energy-saving and environmentally friendly design Energy consumption: Unit energy consumption is 15%-20% lower than that of traditional equipment (such as using servo motor drive system). Waste heat recovery: Cooling water circulation system can reduce water resource consumption by more than 60%.   3. Application fields and typical cases Packaging industry Food packaging: CPP film is used for cooking bags (resistant to high temperature of 121℃), self-supporting bags, etc. Medical packaging: High barrier PVDC coated film to extend the shelf life of drugs. Daily chemical packaging: PET/PE composite film, used for soft packaging such as shampoo and cosmetics. Industrial field Electronic materials: optical grade PET film (thickness 12-50μm), used for LCD backlight module. New energy: solar cell backplane film (fluorine coating), weather resistance ≥ 25 years. Agriculture and construction Agricultural film: EVA anti-fogging film, light transmittance increased by 10%, service life extended to 3 years. Waterproof material: TPO self-adhesive waterproof membrane, tensile strength ≥ 18MPa, puncture resistance ≥ 90N.   4. Maintenance guide Daily maintenance Cleaning: Clean the die flow channel and cooling roller surface after daily shutdown to prevent carbide accumulation. Lubrication: Regularly add high temperature resistant grease (such as Klüberplex BEM 41-132) to the screw and bearing. Regular maintenance (quarterly) Precision calibration: Die gap: Use laser rangefinder to detect, error ≤ 0.01mm. Cooling roller parallelism: Adjust by micrometer, deviation ≤ 0.02mm/m. Parts replacement: Filter: Replace every 500 hours (accuracy 20-40μm). Sealing ring: Check and replace aging parts every 2000 hours.   Troubleshooting Uneven film thickness: Check the tightening torque of the die head bolts (recommended value: 15-20N·m). Adjust the lip gap (calibrate with a 0.01mm feeler gauge). Film wrinkles: Correct the parallelism of the cooling roller and the traction roller (error ≤0.1mm/m). Check the air knife pressure (recommended value: 0.02-0.05MPa).   5. Industry trends and prospects As the packaging industry's requirements for film performance increase, cast film machines are developing in the following directions: Intelligent: Integrate AI visual inspection systems to monitor film defects (such as crystal points and fish eyes) in real time. Green: Use bio-based materials (such as PLA) casting technology to reduce carbon emissions. Multifunctional: Develop special film production lines such as release films and protective films to expand application scenarios. Through continuous technological innovation and refined maintenance, cast film machines will play a greater role in high-end packaging, new energy, electronic information and other fields.

Sustainability Focus: There's a strong emphasis on sustainability, with companies developing cast film lines capable of producing high-performance, thin stretch films using a greater proportion of post-consumer recycled (PCR) materials. This aligns with the EU packaging directive (PPWR) and overall environmental concerns, particularly in applications requiring hygienic material cast film machine outputs for sensitive goods.   Advanced Technology and Efficiency: New cast film lines are being introduced with the most advanced technology, achieving production rates and the ability to produce very thin films (e.g., 8 microns). These machines often include advanced systems for incorporating recycled materials and automated packaging robots, enabling the creation of functional cast film machine products with tailored properties.   Meeting Customer Demands: Investments in new cast lines allow manufacturers to offer a full range of stretch films, better meeting diverse customer demands, including various industrial stretch films and products with high recycled content. This also includes the production of new products like thin hand stretch films with reinforced edges, often manufactured on a versatile flexible packaging cast film line.   Growth in Flexible Packaging: The demand for flexible packaging solutions is a major driver for the cast films market. Cast films offer excellent barrier properties, durability, and clarity, making them suitable for food, pharmaceuticals, and consumer goods. The shift towards lightweight packaging in retail and the growth of e-commerce further amplify this trend.   Advancements in Bio-Based Polymers: The development and use of bio-based polymers in cast films present an emerging opportunity. These sustainable materials offer environmentally friendly alternatives to traditional petroleum-based films while potentially providing comparable or superior performance.   Focus on Automation and Efficiency in Machinery: The stretch film machinery market, closely related to cast film production, is seeing trends towards increased automation, energy-efficient machinery, and the integration of IoT features for better process control and monitoring. Modular designs are also gaining preference for their flexibility.   Growth in Specific Applications: The demand for cast films is rising in various applications, including food and beverage packaging (for extended shelf life and product safety), healthcare (medical and hygiene packaging), and industrial packaging (load containment and reduced material waste).   Market Growth Projections: The global cast films market and related machinery markets are experiencing and are projected to continue experiencing significant growth in the coming years, driven by increasing demand for packaging, technological advancements, and a focus on sustainability.

In today's dynamic industrial landscape, efficient and versatile packaging solutions are paramount. At the forefront of this innovation lies cast film technology, a process that transforms plastic raw materials into continuous films with a wide array of applications across packaging, agriculture, medical, and industrial sectors. Bai Jia stands as a dedicated manufacturer, specializing in the production of high-quality cast film machinery, empowering businesses with solutions. Our commitment extends to providing Functional Cast Film Machine options tailored to diverse needs. The cast film production process involves meticulously heating and melting plastic raw materials, which are then precisely shaped into a continuous film through a sophisticated cast film head.      This intricate equipment comprises several key components working in harmony: A precise feeding system: Ensuring a consistent and controlled supply of raw materials. A carefully regulated heating area: Melting the plastic to the optimal processing temperature. An advanced cast film head: Shaping the molten plastic into a uniform film. A robust roller system: Guiding and cooling the newly formed film. The structural features of our Bai Jia cast film machines are engineered for optimal performance and precision. For specialized applications, consider our Matte Cast Film Line for films with reduced gloss.     Rectifier-type material trough: Our machines feature a rectifier-type material trough, meticulously designed to ensure consistent material distribution from edge to center. This eliminates inconsistencies and guarantees uniform lateral dimensions of the final film. High-precision bottom bracket: Utilizing high-precision cylindrical spindles with an accuracy of approximately 0.002mm, our bottom brackets provide exceptional stability and support for smooth operation. Cylindrical C-shaped scraper: We incorporate cylindrical C-shaped scrapers, which minimize errors and ensure high dimensional accuracy and consistent density of the produced film. Efficient cooling and winding systems: Our equipment employs circulating water cooling for rapid and effective cooling, resulting in excellent film transparency. The friction winding mechanism, coupled with trimming and winding devices, ensures neat and precisely wound film rolls. Durable screw and barrel device: The screw and barrel, critical components of the cast film unit, are constructed from high-quality 38CrMoAIA alloy steel, nitrided and precision machined for long-lasting performance and consistent output. The versatility of cast film technology has led to its widespread adoption in numerous industries, including the secure fastening packaging of building materials, hardware accessories, paper mills, glass bottle factories, and for express companies, pallet packaging, and export packaging. Our advanced designs also include Multi-layer Cast Film Line configurations for enhanced film properties.   Key characteristics cast film machines include: Precision Scraping: The cylindrical C-type scraper minimizes errors, guaranteeing high dimensional accuracy and film density. Stable Support: High-precision cylindrical spindles in the bottom support bracket ensure exceptional operational stability. Uniform Material Distribution: The rectifier trough design ensures consistent material flow, resulting in uniform film width. Enhanced Drying Efficiency: The combination of bottom plate heating and reverse hot air optimizes the drying process, significantly improving overall production efficiency. Choosing Bai Jia as your cast film machinery provider offers significant advantages: High Production Volume: Our machines are engineered for efficient and high-volume film production. Low Consumption: We prioritize energy-efficient designs to minimize operational costs. Intelligent Expansion Force Control: Our advanced systems allow for precise control over the finished product's expansion force. Easy Expansion Force Control: Operators can effortlessly manage the expansion force of the produced film, catering to diverse application requirements.   We are committed to providing our clients with reliable, high-performance cast film machinery tailored to their specific needs. With our deep understanding of cast film technology and unwavering dedication to quality, we are your trusted partner in achieving packaging excellence.   We invite you to learn more about our comprehensive range of cast film machinery. Contact us today for a consultation and discover how Bai Jia can empower your operations.