Introduction to Plastic Board Extrusion
Comprehensive guide to manufacturing high-quality plastic boards from 3mm to 50mm thickness. Master PVC foam, PP honeycomb, PC/PMMA optical and ABS/HIPS board production with YuanSu Machinery’s industry-leading expertise.
Plastic board extrusion produces rigid, flat panels with thickness ranging from 3mm to 50mm, widely used in construction, advertising, automotive and electronics industries. Unlike thin sheets, thick boards require specialized extrusion systems, advanced cooling technology and precise stress control to prevent warping and ensure dimensional stability. YuanSu Machinery has developed optimized processing solutions for all major board materials, delivering high-performance production lines with exceptional reliability.
PVC Thick Board & Foam Board
Rigid & Foam PVC Solutions. Thickness: 3mm – 50mm
Core Processing Characteristics
- Stress-free cooling to prevent board warping and bending
- Precise chemical foaming control for uniform cell structure
- Multi-layer co-extrusion for solid skin-foam core structure
- Wide thickness range from 3mm solid board to 50mm foam board
- Excellent flame retardancy and chemical resistance
- Multiple surface finishing options: smooth, matte, embossed
Typical Applications
- Marine and wet environment applications
- Advertising boards, signages and display materials
- Construction wall panels and ceiling systems
- Furniture components and cabinetry materials
- Chemical-resistant tank linings and equipment enclosures
- Building formwork and temporary construction panels
Detailed Production Process Flow
1. Raw Material Formulation & Mixing
PVC resin, stabilizers, lubricants, foaming agents, fillers and colorants are accurately weighed according to proprietary formulations. High-speed hot and cold mixing ensures uniform dispersion of all additives.
Parameters: Hot mixing temp: 110-120°C | Cold mixing temp: 40-50°C | Mixing time: 15-25 minutes
2. Twin-Screw Extrusion & Melting
A conical or parallel twin-screw extruder specifically designed for PVC processing melts and homogenizes the material. Precise temperature control prevents premature foaming in the barrel.
Parameters: Barrel zones: 140-180°C | Screw speed: 20-60 rpm | Melt temperature: 160-170°C
3. Extrusion Die & Foaming
The molten PVC is extruded through a wide flat die. Foaming occurs as the material exits the die and pressure is released. The die design is critical for controlling foaming ratio and board thickness.
Parameters: Die temperature: 165-175°C | Foaming ratio: 1.5-3.0 times | Die gap: 2-15mm
4. Calendering & Sizing
The extruded board passes through a series of calendering rolls and a vacuum sizing tank that control the final thickness, width and surface finish. Gradual cooling minimizes internal stresses.
Parameters: Roll temperature: 40-70°C | Sizing tank temp: 20-30°C | Line speed: 1-8 m/min
5. Annealing & Stress Relief
The board passes through an annealing oven to relieve residual stresses caused by uneven cooling. This step is critical for preventing warping during subsequent processing and use.
Parameters: Annealing temp: 60-80°C | Residence time: 5-15 minutes | Cooling rate: 1-2°C/min
6. Cutting, Trimming & Stacking
The continuous board is trimmed to width, cut to length using a flying saw, and automatically stacked. Edge trimming is recycled back into the production process to minimize waste.
Parameters: Cutting accuracy: ±2mm | Board length: 1-6m | Stack height: up to 1.5m
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Board Thickness | 3mm – 50mm | ±5% tolerance |
| Maximum Width | Up to 2200mm | 2000mm standard |
| Density (Foam Board) | 0.4 – 0.8 g/cm³ | 0.5 – 0.6 g/cm³ |
| Production Speed | 1 – 10 m/min | 5 m/min average |
| Flatness | ≤0.2mm/m | ≤0.15mm/m |
| Annual Capacity | 2,000 – 8,000 tons | 5,000 tons/year |
Common Defects & Solutions
Uneven Cell Structure
Cause: Inconsistent foaming agent dispersion or temperature fluctuation
Solution: Improve mixing process, optimize barrel temperature profile, use better foaming agents
Board Warping
Cause: Residual internal stress or uneven cooling
Solution: Extend annealing time, optimize cooling profile, adjust line speed
Surface Roughness
Cause: Poor melt quality or die lip buildup
Solution: Clean die lips regularly, optimize formulation, improve filtration
YuanSu Machinery Technology Advantages
- High-performance conical twin-screw extruders optimized for PVC processing
- Advanced foaming technology for uniform cell structure and consistent density
- Multi-zone stress-free cooling system to prevent board warping
- Automatic thickness control system with ±3% tolerance
- Integrated edge trim recycling system for zero material waste
- Customizable surface embossing and finishing options
PP Honeycomb Board
Lightweight High-Strength Structural Materials. Thickness: 5mm – 50mm
Core Processing Characteristics
- Continuous one-step extrusion of honeycomb core structure
- Integrated lamination of solid surface layers with honeycomb core
- Exceptional strength-to-weight ratio (80% lighter than solid PP)
- Customizable cell size and board thickness for different loads
- 100% recyclable and environmentally friendly material
- Excellent water resistance and chemical stability
Typical Applications
- Automotive interior panels, door liners and trunk floors
- Lightweight packaging for heavy and fragile goods
- Building partitions, wall panels and ceiling systems
- Furniture components and lightweight cabinetry
- Logistics turnover boxes and pallets
- Marine and recreational vehicle construction
Detailed Production Process Flow
1. Raw Material Preparation
Homopolymer or copolymer PP resin is used for both the honeycomb core and surface layers. Additives such as UV stabilizers, antioxidants and colorants are mixed as required.
Parameters: Melt flow index: 1-5 g/10min | Drying temp: 80°C for 2-3 hours | Moisture < 0.05%
2. Multi-Extruder Feeding
Three separate extruders are used: one for the honeycomb core and two for the top and bottom surface layers. This allows independent control of core and skin properties.
Parameters: Core extruder temp: 180-220°C | Skin extruder temp: 190-230°C | Screw speed: 30-80 rpm
3. Honeycomb Core Extrusion
The core melt is extruded through a specialized honeycomb die with thousands of small nozzles that form the hexagonal cell structure. The die design determines cell size and wall thickness.
Parameters: Die temperature: 210-220°C | Cell size: 5-20mm | Wall thickness: 0.2-0.5mm
4. Surface Layer Lamination
The molten surface layers are simultaneously extruded and laminated onto the top and bottom of the honeycomb core while it is still hot. This creates a permanent bond without adhesives.
Parameters: Lamination temperature: 180-200°C | Skin thickness: 0.3-1.0mm | Bond strength: > 200 N/50mm
5. Cooling & Sizing
The laminated board passes through a series of cooling rolls and a sizing section that controls the final thickness and flatness. Controlled cooling prevents cell collapse and ensures dimensional stability.
Parameters: Cooling roll temp: 20-40°C | Line speed: 2-10 m/min | Thickness tolerance: ±0.5mm
6. Cutting & Finishing
The continuous board is trimmed to width, cut to length using a precision saw, and automatically stacked. Edge sealing can be performed inline for moisture protection.
Parameters: Cutting accuracy: ±2mm | Board length: 1-6m | Maximum width: 2000mm
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Board Thickness | 5mm – 50mm | ±0.5mm tolerance |
| Maximum Width | Up to 2000mm | 1800mm standard |
| Density | 0.15 – 0.5 g/cm³ | 0.2 – 0.3 g/cm³ |
| Cell Size | 5mm – 20mm | 10mm standard |
| Compressive Strength | 0.2 – 1.0 MPa | 0.5 MPa |
| Annual Capacity | 1,000 – 5,000 tons | 3,000 tons/year |
Common Defects & Solutions
Cell Collapse
Cause: Excessive temperature or insufficient cooling
Solution: Reduce melt temperature, increase cooling rate, optimize line speed
Poor Layer Bonding
Cause: Mismatched melt temperatures or insufficient pressure
Solution: Adjust skin layer temperature, increase lamination pressure
Uneven Cell Size
Cause: Die blockage or uneven flow distribution
Solution: Clean die thoroughly, optimize die design, improve melt homogeneity
YuanSu Machinery Technology Advantages
- Patented one-step continuous honeycomb extrusion technology
- Precision-engineered honeycomb dies for uniform cell structure
- Integrated inline lamination system for strong, adhesive-free bonding
- Customizable cell size and board thickness for specific applications
- High-speed production up to 10 m/min with consistent quality
- Automatic edge sealing system for enhanced moisture resistance
PC/PMMA/GPPS Board
Optical-Grade Transparent & Translucent Boards. Thickness: 3mm – 50mm
Core Processing Characteristics
- High-temperature processing up to 300°C for polycarbonate
- Strict optical quality control for transparent applications
- Stress relief annealing process to eliminate internal stresses
- Integrated protective film application during production
- Excellent light transmission (up to 92% for PMMA)
- High impact resistance (250 times stronger than glass for PC)
Typical Applications
- Signage, advertising displays and light boxes
- Safety glazing and bullet-resistant panels
- Architectural windows, skylights and canopies
- Lighting fixtures and diffuser panels
- Display cases and museum exhibits
- Medical equipment and protective shields
Detailed Production Process Flow
1. Raw Material Drying
PC and PMMA are highly hygroscopic and must be thoroughly dried to prevent hydrolysis and optical defects. Closed-loop dehumidifying dryers are used to achieve extremely low moisture levels.
Parameters: PC drying: 120°C for 6-8 hours | PMMA drying: 80°C for 4-6 hours | Moisture < 0.005%
2. Single-Screw Extrusion & Melting
A high-performance single-screw extruder with a low-shear design is used to melt the material without causing degradation. Precise temperature profiling is critical for maintaining optical clarity.
Parameters: PC barrel zones: 240-300°C | PMMA barrel zones: 180-240°C | Screw speed: 20-60 rpm
3. Melt Filtration & Pumping
The molten polymer passes through a high-precision melt filter with fine mesh screens to remove even the smallest contaminants. A gear pump provides constant pressure and flow to the die.
Parameters: Filter mesh: 200-300 micron | Melt pressure: 120-180 bar | Pump speed: 10-40 rpm
4. Sheet Extrusion & Polishing
The melt is extruded through a high-precision flat die and cast onto a series of highly polished chrome rolls. The rolls are temperature-controlled to achieve the desired surface finish and optical properties.
Parameters: Die temperature: 260-280°C (PC) | Roll temperature: 80-120°C | Line speed: 1-6 m/min
5. Annealing & Stress Relief
The board passes through a long annealing oven to eliminate internal stresses that could cause cracking or optical distortion. Slow cooling ensures complete stress relief.
Parameters: Annealing temp: 120-140°C (PC) | Residence time: 10-30 minutes | Cooling rate: 1°C/min
6. Protective Film Application & Cutting
Protective films are applied to both sides of the board to prevent scratches during handling and transportation. The board is then cut to size and carefully packaged.
Parameters: Film thickness: 50-100 micron | Cutting accuracy: ±1mm | Board length: 1-4m
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Board Thickness | 3mm – 50mm | ±3% tolerance |
| Maximum Width | Up to 2000mm | 1800mm standard |
| Light Transmission (PMMA) | > 90% | > 92% |
| Light Transmission (PC) | > 85% | > 88% |
| Haze | < 1% | < 0.5% |
| Annual Capacity | 2,000 – 6,000 tons | 4,000 tons/year |
Common Defects & Solutions
Optical Distortion
Cause: Internal stress or uneven cooling
Solution: Extend annealing time, optimize cooling profile, improve roll temperature control
Surface Defects
Cause: Contaminants in melt or roll imperfections
Solution: Improve filtration, polish rolls regularly, maintain clean production environment
Yellowing
Cause: Material degradation due to excessive temperature
Solution: Reduce processing temperature, shorten residence time, use stabilizers
YuanSu Machinery Technology Advantages
- High-precision extrusion dies for exceptional optical clarity
- Super-polished chrome rolls with mirror finish (Ra < 0.02 micron)
- Closed-loop dehumidifying drying system with moisture monitoring
- Advanced temperature control system with ±1°C accuracy
- Multi-zone annealing system for complete stress relief
- Integrated online protective film application system
- Optical quality inspection system with defect detection
ABS/HIPS Single & Multi-Layer Board
High-Impact Thermoforming Structural Boards. Thickness: 3mm – 50mm
Core Processing Characteristics
- Single & multi-layer co-extrusion for enhanced performance combinations
- Optimized processing to maintain excellent impact resistance
- Superior surface finish ideal for painting, printing and vacuum forming
- Excellent thermoformability for complex three-dimensional shapes
- Wide hardness range from soft-touch to rigid structural grades
- Good chemical resistance and dimensional stability
Typical Applications
- Automotive interior panels, door trims and instrument panel substrates
- Refrigerator liners, freezer compartments and appliance housings
- Luggage, suitcases and travel accessories
- Electronic equipment enclosures and console covers
- Toys, sporting goods and consumer products
- Medical equipment housings and laboratory furniture
Detailed Production Process Flow
1. Raw Material Drying & Blending
ABS and HIPS resins are hygroscopic and must be dried to prevent surface defects and degradation. Different grades can be blended to achieve specific hardness and impact properties.
Parameters: ABS drying: 80-90°C for 4-6 hours | HIPS drying: 70-80°C for 3-4 hours | Moisture content < 0.03%
2. Single/Multi-Extruder Feeding
For single-layer boards, one extruder is used. For multi-layer boards (e.g., ABS/HIPS/ABS), multiple extruders feed different materials to the co-extrusion feedblock independently.
Parameters: ABS barrel zones: 180-240°C | HIPS barrel zones: 170-220°C | Screw speed: 30-80 rpm
3. Co-Extrusion Feedblock & Die
The molten materials are combined in a co-extrusion feedblock that precisely controls layer thickness ratios. The combined melt flows through a wide flat die with individually adjustable lip segments.
Parameters: Die temperature: 210-230°C | Layer ratio accuracy: ±2% | Die gap: 3-55mm
4. Calendering & Surface Finishing
The extruded melt passes through a set of three polished chrome calendering rolls that control the final thickness, surface finish and flatness. Roll temperatures are carefully balanced to prevent stress.
Parameters: Roll temperature: 60-100°C | Line speed: 2-10 m/min | Surface roughness: Ra < 0.05 micron
5. Annealing & Stress Relief
The board passes through an annealing oven to eliminate residual stresses that could cause warping during thermoforming. Controlled cooling ensures consistent material properties.
Parameters: Annealing temperature: 80-100°C | Residence time: 5-20 minutes | Cooling rate: 1-3°C/min
6. Surface Treatment & Cutting
Optional corona treatment can be applied to improve printing and painting adhesion. The board is then trimmed to width, cut to length and automatically stacked.
Parameters: Corona power: 10-20 kW | Cutting accuracy: ±1.5mm | Board length: 1-6m
Technical Specifications
| Parameter | Value Range | YuanSu Standard |
|---|---|---|
| Board Thickness | 3mm – 50mm | ±4% tolerance |
| Maximum Width | Up to 2200mm | 2000mm standard |
| Izod Impact Strength (ABS) | ≥10 kJ/m² | ≥15 kJ/m² |
| Production Speed | 2 – 12 m/min | 6 m/min average |
| Flatness | ≤0.2mm/m | ≤0.15mm/m |
| Annual Capacity | 3,000 – 10,000 tons | 6,000 tons/year |
Common Defects & Solutions
Silver Streaks
Cause: Moisture in raw material or air entrapment
Solution: Extend drying time, improve venting on extruder, reduce screw speed
Layer Delamination
Cause: Poor adhesion between layers or mismatched melt temperatures
Solution: Optimize melt temperature matching, use compatible resin grades
Poor Thermoforming
Cause: Excessive residual stress or incorrect material grade
Solution: Extend annealing time, adjust processing parameters, select proper resin
YuanSu Machinery Technology Advantages
- Advanced multi-layer co-extrusion technology for up to 5-layer composite boards
- Specialized screw design optimized for ABS/HIPS to prevent material degradation
- High-precision calendering system for mirror-like surface finish
- Integrated online corona treatment system for improved surface adhesion
- Intelligent stress control system ensuring excellent thermoforming performance
- High-torque gearboxes for stable operation at high output and heavy loads
