Introduction to Plastic Film Extrusion
Comprehensive guide to manufacturing high-precision plastic films from 0.008mm to 2mm thickness. Master TPU, stretch, cast and solar encapsulation film production with YuanSu Machinery’s industry-leading expertise.
Plastic film extrusion produces thin, flexible sheets with thickness ranging from 0.008mm to 2mm, serving as critical materials in packaging, automotive, construction and renewable energy industries. Modern film production demands extreme precision in thickness control (down to ±2%), ultra-high production speeds (up to 600m/min) and consistent material properties. YuanSu Machinery has developed optimized processing solutions for all major film materials, delivering high-performance lines with exceptional reliability and energy efficiency.
TPU High-Low Temperature & High-Elastic Film
High-Performance Elastomeric Films. Thickness: 0.008mm – 0.25mm
Core Processing Characteristics
- Low-shear screw design to preserve TPU elasticity and prevent degradation
- Multi-zone precision temperature control (±1°C accuracy)
- High-low temperature co-extrusion capability for multi-functional films
- Gradual cooling system to maintain clarity and mechanical properties
- Anti-stick surface treatment for easy unwinding and processing
- Ultra-thin film production down to 8 micron thickness
Typical Applications
- Medical protective films and wound dressings
- Automotive interior films and paint protection films (PPF)
- Waterproof and breathable membranes for construction
- Adhesive tapes and laminating films
- Sports equipment and inflatable products
- Electronic device protective films
Detailed Production Process Flow
1. Raw Material Drying & Preparation
TPU is highly hygroscopic and must be thoroughly dried to prevent hydrolysis and bubble formation. Closed-loop dehumidifying dryers are used to achieve extremely low moisture levels.
Parameters: Drying temperature: 80-100°C | Drying time: 3-6 hours | Moisture content < 0.02%
2. Low-Shear Extrusion & Melting
A specially designed low-shear single-screw extruder melts the TPU without causing molecular chain breakage. Precise temperature profiling is critical to maintain material elasticity.
Parameters: Barrel zones: 160-220°C | Screw speed: 50-150 rpm | Melt temperature: 190-210°C
3. Melt Filtration & Gear Pumping
The molten TPU passes through a high-precision melt filter to remove contaminants. A gear pump provides constant pressure and flow rate to the die, ensuring uniform film thickness.
Parameters: Filter mesh: 150-250 micron | Melt pressure: 100-180 bar | Pump speed: 20-60 rpm
4. Co-Extrusion Feedblock & Die
For multi-layer films, different TPU grades are combined in a co-extrusion feedblock. The melt flows through a precision flat die with automatically adjustable lip segments.
Parameters: Die temperature: 200-215°C | Die gap: 0.1-0.5mm | Layer ratio accuracy: ±1%
5. Chill Roll Casting & Cooling
The molten film is cast onto a polished chrome chill roll with precise temperature control. Gradual cooling minimizes internal stresses and preserves the film’s elastic properties.
Parameters: Chill roll temperature: 50-80°C | Line speed: 50-300 m/min | Cooling rate: 10-20°C/s
6. High-Speed Winding & Slitting
The film is trimmed to width and wound into large rolls using a tension-controlled winding system. Optional inline slitting produces rolls of specific widths for customer requirements.
Parameters: Maximum winding speed: 600 m/min | Roll diameter: up to 1000mm | Tension control: ±1%
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Film Thickness | 0.008mm – 0.25mm | ±2% tolerance |
| Maximum Width | Up to 2500mm | 2200mm standard |
| Production Speed | 50 – 600 m/min | 300 m/min average |
| Elongation at Break | 400 – 800% | 600% minimum |
| Maximum Co-Extrusion Layers | Up to 7 layers | 5 layers standard |
| Annual Capacity | 3,000 – 12,000 tons | 8,000 tons/year |
Common Defects & Solutions
Loss of Elasticity
Cause: Excessive shear or thermal degradation
Solution: Reduce screw speed, lower processing temperature, use low-shear screw design
Surface Stickiness
Cause: Insufficient cooling or improper anti-blocking additives
Solution: Increase chill roll temperature, optimize additive formulation
Thickness Variation
Cause: Melt pressure fluctuation or die lip misalignment
Solution: Calibrate gear pump, adjust automatic die lip control system
YuanSu Machinery Technology Advantages
- Patented high-low temperature co-extrusion technology for multi-functional TPU films
- 25% lower power consumption compared to conventional TPU film lines
- High-speed winding system up to 600m/min with perfect roll formation
- Integrated online thickness measurement and automatic control system
- Specialized anti-stick treatment for all contact surfaces
- Compatible with all TPU grades from 60A to 95D hardness
PET/PE/PP/PS Stretch Film
High-Speed Multi-Layer Packaging Films. Thickness: 0.01mm – 0.25mm
Core Processing Characteristics
- Multi-layer co-extrusion (up to 7 layers) for enhanced barrier properties
- High-speed extrusion with optimized screw geometry
- Biaxial stretching for improved tensile strength and clarity
- Integrated edge trim recycling system for zero material waste
- Automatic roll changing system for uninterrupted production
- Precise tension control throughout the production line
Typical Applications
- Food packaging films for fresh produce and processed foods
- Industrial stretch wrap and pallet wrapping films
- Shrink films for packaging and labeling
- Stretch hoods for industrial packaging
- Medical and pharmaceutical packaging
- Electronic component protective films
Detailed Production Process Flow
1. Raw Material Blending & Drying
Different resins and additives are accurately weighed and blended according to formulation requirements. Hygroscopic materials like PET require pre-drying to prevent defects.
Parameters: PET drying: 160°C for 4-6 hours | PE/PP: no drying required | Moisture < 0.005% (PET)
2. Multi-Extruder Feeding
Multiple extruders feed different materials to the co-extrusion feedblock. Each extruder is optimized for its specific material to ensure optimal melting and mixing.
Parameters: PE barrel zones: 160-200°C | PET barrel zones: 220-270°C | Screw speed: 100-300 rpm
3. Co-Extrusion & Die Formation
The molten materials are combined in a feedblock and extruded through a flat die. The die design ensures uniform flow distribution across the entire width of the film.
Parameters: Die temperature: 200-250°C | Die gap: 0.2-1.0mm | Layer ratio: 5-40% per layer
4. Chill Roll Casting
The molten film is cast onto a highly polished chill roll that rapidly cools and solidifies the material. The roll temperature controls the film’s crystallinity and clarity.
Parameters: Chill roll temperature: 20-60°C | Line speed: 100-500 m/min | Cooling rate: 50-100°C/s
5. Biaxial Stretching (Optional)
For high-performance films, the cast film is stretched in both machine and transverse directions to orient the polymer molecules and improve mechanical properties.
Parameters: MD stretch ratio: 3-5x | TD stretch ratio: 3-5x | Stretching temperature: 80-120°C
6. Trimming & Automatic Winding
The film edges are trimmed and recycled back into the process. The finished film is wound into large rolls using an automatic turret winder for uninterrupted production.
Parameters: Maximum winding speed: 500 m/min | Roll diameter: up to 1200mm | Trim recycling rate: 100%
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Film Thickness | 0.01mm – 0.25mm | ±2% tolerance |
| Maximum Width | Up to 3500mm | 3000mm standard |
| Production Speed | 100 – 500 m/min | 300 m/min average |
| Maximum Co-Extrusion Layers | Up to 7 layers | 5 layers standard |
| Light Transmission (Clear) | > 90% | > 92% |
| Annual Capacity | 5,000 – 20,000 tons | 12,000 tons/year |
Common Defects & Solutions
Stretch Breakage
Cause: Inconsistent film thickness or improper stretching temperature
Solution: Optimize die lip adjustment, adjust stretching temperature profile
High Haze
Cause: Improper cooling rate or excessive crystallinity
Solution: Lower chill roll temperature, optimize extrusion temperature
Poor Heat Sealability
Cause: Incorrect seal layer formulation or processing temperature
Solution: Adjust seal layer resin grade, optimize co-extrusion parameters
YuanSu Machinery Technology Advantages
- Advanced 7-layer co-extrusion technology for high-barrier packaging films
- Energy-efficient screw design reducing power consumption by 20%
- Integrated edge trim recycling system with automatic feeding
- Automatic turret winder for non-stop production at 500m/min
- Online thickness measurement system with closed-loop control
- Quick material changeover system minimizing downtime
CPP/CPE/EVA Cast Film
High-Precision Casting Films. Thickness: 0.02mm – 0.25mm
Core Processing Characteristics
- Low-temperature gentle processing to maintain material clarity
- Mirror-finish chrome casting rolls for superior surface quality
- Precise air gap control between die and casting roll
- Advanced corona treatment for excellent printing adhesion
- Ultra-wide production capability up to 3500mm
- Inline lamination and coating capabilities
Typical Applications
- Flexible food packaging films (snacks, confectionery)
- Lamination substrates for composite packaging
- Solar backsheet films and photovoltaic components
- Medical packaging and sterile barrier films
- Industrial packaging and protective films
- Label stock and adhesive tape substrates
Detailed Production Process Flow
1. Raw Material Preparation
Polypropylene, polyethylene and EVA resins are blended with additives such as slip agents, anti-blocking agents and stabilizers according to specific formulations.
Parameters: Mixing time: 5-10 minutes | Mixing temperature: 40-60°C | Additive loading: 0.1-2%
2. Single/Multi-Extruder Melting
The blended material is fed into single or multiple extruders (for co-extrusion). The screw design is optimized for gentle melting and uniform mixing.
Parameters: CPP barrel zones: 200-240°C | EVA barrel zones: 140-180°C | Screw speed: 80-200 rpm
3. Melt Filtration & Pumping
The molten polymer passes through a continuous screen changer to remove contaminants. A precision gear pump ensures constant melt pressure and flow rate.
Parameters: Filter mesh: 100-200 micron | Melt pressure: 80-150 bar | Pump accuracy: ±0.5%
4. Flat Die Extrusion & Casting
The melt is extruded through a precision flat die and cast onto a large-diameter chrome-plated casting roll. The air gap between die and roll is precisely controlled.
Parameters: Die temperature: 210-230°C | Air gap: 10-30mm | Casting roll diameter: 600-1200mm
5. Cooling & Surface Treatment
The film is rapidly cooled on the casting roll to achieve the desired clarity and mechanical properties. Optional corona treatment is applied to improve surface energy.
Parameters: Casting roll temperature: 20-40°C | Line speed: 50-300 m/min | Corona power: 10-40 kW
6. Trimming & Precision Winding
The film edges are trimmed and recycled. The finished film is wound into rolls with precise tension control to ensure uniform roll density and prevent wrinkles.
Parameters: Winding tension: 5-50 N/m | Roll diameter: up to 1000mm | Thickness tolerance: ±1.5%
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Film Thickness | 0.02mm – 0.25mm | ±1.5% tolerance |
| Maximum Width | Up to 3500mm | 3200mm standard |
| Production Speed | 50 – 350 m/min | 200 m/min average |
| Surface Roughness (Ra) | < 0.02 micron | < 0.015 micron |
| Corona Treatment Level | 38 – 42 dynes/cm | 40 dynes/cm minimum |
| Annual Capacity | 4,000 – 15,000 tons | 10,000 tons/year |
Common Defects & Solutions
Crystal Points
Cause: Unmelted resin particles or contamination
Solution: Increase filter mesh size, improve raw material quality, optimize extrusion temperature
Flow Marks
Cause: Uneven melt flow or die lip buildup
Solution: Clean die lips regularly, adjust melt temperature, optimize die design
Film Curling
Cause: Uneven cooling on both sides of the film
Solution: Adjust cooling air flow, balance roll temperatures, optimize line speed
YuanSu Machinery Technology Advantages
- Ultra-wide casting rolls up to 3500mm for high-volume production
- Precision air gap control system for uniform film thickness
- Advanced corona treatment with automatic power adjustment
- Integrated inline lamination and coating capabilities
- Modular design for quick material changeovers (under 2 hours)
- Energy-efficient extrusion system with 25% lower power consumption
PVB/POE/EVA Interlayer Film
Photovoltaic Encapsulation & Safety Glass Films. Thickness: 0.25mm – 2.0mm
Core Processing Characteristics
- Integrated moisture control system critical for PVB film production
- Clean room compatible design for high-purity film manufacturing
- Low-tension winding technology to prevent film distortion
- Precise cross-web thickness distribution for uniform lamination
- UV stabilization for long-term outdoor durability
- High optical clarity and excellent adhesion to glass
Typical Applications
- Solar panel encapsulation films (EVA/POE)
- Automotive windshields and side windows
- Architectural laminated safety glass
- Bullet-resistant and blast-resistant glass
- Display glass and touch screen interlayers
- Marine and aerospace glazing systems
Detailed Production Process Flow
1. Raw Material Drying & Dehumidification
PVB, EVA and POE resins are extremely sensitive to moisture. Closed-loop dehumidifying systems with dew point control below -40°C are used to ensure ultra-low moisture levels.
Parameters: PVB drying: 60-80°C for 4-6 hours | EVA drying: 50-60°C for 2-4 hours | Moisture content < 0.01%
2. Low-Shear Extrusion & Melting
A specially designed low-shear extruder melts the material without causing cross-linking or degradation. The entire production line is maintained in a controlled humidity environment.
Parameters: PVB barrel zones: 120-160°C | EVA barrel zones: 90-130°C | Screw speed: 30-100 rpm
3. High-Precision Melt Filtration
The molten polymer passes through multiple stages of high-precision filtration to remove even the smallest contaminants, which would cause defects in laminated glass.
Parameters: Filter mesh: 200-400 micron | Melt pressure: 80-150 bar | Filtration efficiency: 99.9% @ 50 micron
4. Flat Die Extrusion & Casting
The melt is extruded through a high-precision flat die with individually adjustable lip segments. The film is cast onto a polished chill roll with precise temperature control.
Parameters: Die temperature: 130-150°C (PVB) | Chill roll temp: 10-30°C | Die gap: 0.3-2.5mm
5. Controlled Cooling & Conditioning
The film passes through a series of cooling rolls and a conditioning chamber to stabilize its dimensions and moisture content. This step is critical for preventing post-production shrinkage.
Parameters: Conditioning temp: 20-25°C | Relative humidity: 30-40% | Line speed: 10-50 m/min
6. Low-Tension Winding & Packaging
The film is wound into large rolls using a low-tension winding system to prevent stretching and distortion. Rolls are immediately vacuum-sealed in moisture-proof packaging.
Parameters: Winding tension: 2-10 N/m | Roll diameter: up to 1000mm | Roll weight: up to 3 tons
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Film Thickness | 0.25mm – 2.0mm | ±2% tolerance |
| Maximum Width | Up to 2500mm | 2200mm standard |
| Production Speed | 10 – 60 m/min | 30 m/min average |
| Light Transmission | > 91% | > 92% |
| Haze | < 0.5% | < 0.3% |
| Annual Capacity | 2,000 – 8,000 tons | 5,000 tons/year |
Common Defects & Solutions
Bubbles in Laminated Glass
Cause: Excessive moisture in film or improper lamination
Solution: Improve drying system, maintain controlled humidity environment, optimize packaging
Poor Adhesion
Cause: Incorrect formulation or processing temperature
Solution: Adjust resin grade, optimize extrusion temperature, use proper adhesion promoters
Film Shrinkage
Cause: Residual stress or improper conditioning
Solution: Extend conditioning time, reduce winding tension, optimize cooling profile
YuanSu Machinery Technology Advantages
- Dedicated PVB extrusion lines with integrated closed-loop moisture management
- Clean room compatible design meeting ISO 14644-1 Class 8 standards
- High-precision melt filtration system for defect-free film production
- Low-tension winding system with ±0.5% tension control accuracy
- Full compliance with IEC 61730 (solar) and ASTM E1300 (safety glass) standards
- Automatic moisture monitoring and control system throughout the line
