PVC WPC Foam Board Production Line

Overview

The PVC WPC Foam Board Production Line by Chenxing Machinery is a heavy-duty industrial system built for continuous production of PVC and wood-plastic composite foam boards in widths from 915 mm to 1,830 mm and thicknesses from 3 mm to 40 mm. Three configurations are available: the SJS280/156 single-extruder system delivering 400 kg/hr, the SJS292/188 single-extruder system delivering 600 kg/hr, and the SJS280/156 + SJS265/132 co-extrusion system that adds a second single screw extruder and distributor to produce A+B+A three-layer boards — a foamed core sandwiched between two solid skin layers — also at 600 kg/hr.

These foam boards are the go-to material for cabinet manufacturing, concrete formwork, interior door cores, and flooring underlayment in construction markets worldwide. Compared to plywood and MDF, PVC/WPC foam boards are 100% waterproof, termite-proof, and require no painting or edge-banding for finished cabinet faces. The full product catalog details all Chenxing extrusion equipment for foam board manufacturers.

Technical Parameters

Model selection: The SJS280/156 is the standard production workhorse — 400 kg/hr output translates to roughly 160 sheets of 1,220 × 2,440 × 18 mm foam board per 8-hour shift, sufficient for a mid-sized cabinet factory or regional board distributor. The SJS292/188 jumps to 600 kg/hr (approximately 240 sheets of the same size per shift) and extends the line to 30 meters for additional cooling capacity to match the higher throughput. The co-extrusion configuration uses the SJS280/156 as the main extruder feeding the foamed core layer and the SJS265/132 as the co-extruder feeding the solid PVC skin on both sides — producing a three-layer board with a smooth, dense surface for direct printing or lamination and a lightweight foamed core that reduces weight and material cost by 15–20%. For upstream material mixing, our high speed mixer ensures uniform blending of PVC resin, foaming agent, and fillers before feeding into the extruder.

System Configuration

● = Standard configuration — = Not applicable

Core Features

Conical Twin-Screw Extruder — Optimized for Foaming

Foam board extrusion is fundamentally different from solid board production. The PVC dry blend contains a chemical foaming agent (typically azodicarbonamide, 0.3–0.8% by weight) that decomposes at 170–200°C, releasing gas that forms the cellular structure. The extruder must plasticize the PVC fully before the foaming agent decomposes — if the PVC reaches gelation temperature (approximately 185°C) while the foaming agent has already released its gas, the gas escapes before the melt matrix can trap it, resulting in collapsed cells and poor foam density. The conical twin-screw design handles this with a progressively decreasing channel cross-section that builds pressure gently, delaying gas release until the melt is homogeneous and the die back-pressure holds the gas in solution until the board exits the die — at which point controlled expansion creates uniform cells across the entire board cross-section. Our PVC pipe extrusion line page shows related twin-screw technology from our standard product range.

A+B+A Three-Layer Co-Extrusion — Premium Surface at Lower Cost

The co-extrusion option pairs the main extruder (SJS280/156, processing the foamed core formulation) with a co-extruder (SJS265/132, processing a solid, unfoamed PVC skin formulation) and a distributor that splits the co-extruder's output into two thin streams — one for the top surface and one for the bottom surface of the board. The result is a three-layer board: solid skin on both faces for a smooth, scratch-resistant, paintable or printable surface, and a foamed core for weight reduction and material cost savings.

The economics are compelling. A 1,220 × 2,440 × 18 mm solid PVC board weighs approximately 58 kg and requires approximately 63 kg of raw material (allowing for trim waste). The same board in A+B+A co-extruded format weighs approximately 42–48 kg — 20–25% lighter — and uses approximately 10–15% less PVC resin because the foamed core expands to fill volume with less material. For a factory producing 200 boards per day, that is roughly 2,000–3,000 kg of resin saved per day. The lighter weight also reduces shipping costs: a 20-foot container holds approximately 500 solid boards versus 580–600 co-extruded boards. For raw material preparation, our hopper dryer removes moisture from PVC resin and fillers, and our vacuum loader automates material feeding to both extruders.

Required Water Chiller — Fast Cooling for High Output

Every foam board line must be paired with a water chiller — this is not optional. The reason: when the foam board exits the die at 180–190°C, the foaming reaction is still active, and the board surface is tacky. If the calibration platform and cooling frame receive inconsistent water temperature (as happens with a simple open-loop water supply where ambient temperature varies across the day), the board cools unevenly — the foam cells on the faster-cooling side collapse while the slower-cooling side continues expanding, creating warpage that renders the board unsellable. A closed-loop industrial chiller maintains the cooling water at a set temperature (typically 10–15°C for foam board) regardless of ambient conditions, delivering consistent cooling across all board contact points throughout a 24-hour continuous production run. The chiller capacity is sized to the extruder output — our application engineers include the correctly sized chiller in every quotation.

Standardized Board Widths for Global Markets

All three configurations produce boards in three standard widths — 915 mm, 1,220 mm, and 1,830 mm — which map directly to international plywood and MDF sheet dimensions. The 1,220 × 2,440 mm format (4 × 8 feet) is the global construction standard, fitting directly into standard cabinet cut-lists, formwork layouts, and container loading plans without trim waste. The 915 mm and 1,830 mm widths serve niche markets: 915 mm for compact living-space cabinetry common in Asian and European apartment construction, 1,830 mm for oversized architectural panels and commercial formwork. Width changeover involves swapping the die and adjusting the calibration platform's roller spacing — approximately 2–3 hours — and production typically runs a single width continuously for days or weeks rather than switching widths multiple times per shift. For edge sealing and post-processing, our plastic embossing machine can apply wood-grain or decorative textures to board surfaces inline.

Complete Line Integration — Extruder to Stacked Board, One System

The foam board line is a fully integrated system where each component is sized to match the extruder's output. The calibrating platform uses multiple roller pairs with independent gap adjustment to set the board thickness precisely as it exits the die while still soft. The cooling frame that follows is a multi-deck rack with dozens of driven rollers that support the board as it travels through an extended cooling path — the 30-meter length of the SJS292/188 allows the 600 kg/hr board to cool through its full 40 mm thickness before the haul-off grips it, preventing deformation. The haul-off machine's wide rubber rollers (matching the full board width) pull without leaving surface marks. The flying cutting machine trim the board to length with a saw blade that travels with the board during the cut, producing clean, square edges. The automatic stacker collects cut boards and stacks them neatly for forklift pickup — no manual lifting of 50+ kg boards required. For waste recycling, our plastic pelletizing system converts board trim and off-spec sheets back into reusable pellets. A full range of auxiliary equipment — from dust collectors to labeling machines — is available to complete the factory setup.

Production Process

1. Dry Blend Mixing — PVC resin (K-value 57–60 for foam, lower than pipe-grade PVC), calcium carbonate filler (10–30 parts per 100 resin), chemical foaming agent (0.3–0.8%), stabilizers, processing aids, and colorant are mixed in a high speed mixer at 110–120°C, then cooled to 40°C in a cooling mixer. The foaming agent must not pre-decompose during mixing, so temperature control at this stage is critical.

2. Extrusion — The dry blend enters the conical twin-screw extruder via a vacuum conveyor. Four barrel zones (typically 155°C → 165°C → 175°C → 180°C) progressively plasticize the PVC while the channel compression prevents premature gas release. For the co-extrusion configuration, a second extruder feeds solid PVC skin formulation to the distributor, which injects thin surface layers onto both faces of the foamed core melt stream inside the die.

3. Die Forming & Foaming — The melt exits the flat sheet die at 175–185°C. The moment the pressure drops to atmospheric, the dissolved gas expands, creating the foam cell structure. The die's flexible lip allows fine-tuning of thickness uniformity across the full board width.

4. Calibration & Cooling — The hot, still-expanding board enters the calibrating platform where roller pairs set the final thickness and surface flatness. The board then travels through the multi-deck cooling frame for 15–25 minutes, depending on thickness, until the core temperature drops below 60°C. Consistent cooling water temperature from the industrial chiller is essential during this stage.

5. Haul-Off & Cutting — The cooled board is pulled by the wide-belt haul-off at a speed synchronized with the extruder output. A flying saw cuts the board to the programmed sheet length — typically 2,440 mm (8 feet) for construction markets — with square, clean edges.

6. Stacking — The automatic stacker collects cut boards and builds counted stacks. Stacks are removed by forklift and moved to the finished goods area or directly into a container for shipping.

For operations generating significant trim and off-spec waste, our plastic recycling system grinds and re-pelletizes the material for re-use in the foamed core layer at up to 20% regrind content without affecting foam density or surface quality.

Application Guide

FAQ

1. What is the difference between single-layer and A+B+A co-extrusion foam board — and when should I invest in the co-ex configuration?

A single-layer foam board is one homogeneous material from surface to surface, with the foam cell structure visible on both faces. It is suitable for applications where the board surface is hidden — concrete formwork, door cores, flooring underlay, and wall substrates that will be covered with laminate or wallpaper. The board surface has a matte, slightly textured appearance from the foam cells breaking at the surface.

An A+B+A co-extrusion board has solid PVC skin layers (typically 0.3–0.5 mm thick) on both faces, with the foamed core sandwiched between them. The solid skins deliver a smooth, glossy surface that can be directly UV-printed, painted, or hot-stamped with wood-grain film — critical for cabinet doors, furniture panels, and visible partition walls where appearance matters. The foamed core reduces weight by 15–20% and material cost by 10–15% compared to a solid board of the same thickness.

The co-extrusion configuration adds approximately 40–50% to the line cost (second extruder, distributor, and more complex die), but for a cabinet board manufacturer selling decorative panels at a premium price, the payback period is typically 8–14 months based on material savings alone. If your primary customers are construction companies buying formwork and underlayment at commodity prices, the single-layer system is the correct investment. Many manufacturers start with the single-layer SJS280/156 or SJS292/188 and add the co-extrusion extruder and distributor as a retrofit when their customer mix shifts toward visible-surface products. Our solutions page includes example factory layouts for both configurations.

2. What foam board density can this line achieve, and how does density affect the board's mechanical properties?

The SJS series achieves foam board densities from 0.45 g/cm³ to 0.80 g/cm³ depending on the foaming agent dosage and processing conditions. Here is how density maps to applications:

• 0.45–0.55 g/cm³: Lightweight partition panels and exhibition boards. Low density means lower screw-holding strength (screws strip at 1.5–2.0 N·m torque), so these boards are used where mechanical fasteners are not the primary load path. At this density, a 1,220 × 2,440 × 18 mm board weighs approximately 24–30 kg.

• 0.55–0.65 g/cm³: The sweet spot for cabinet boards and door cores. Screw-holding strength reaches 2.5–3.5 N·m — sufficient for cabinet hinges, drawer slides, and door handle hardware. Board weight is approximately 30–35 kg for the standard sheet size.

• 0.65–0.80 g/cm³: High-density boards for concrete formwork and structural applications. At this density, the foam cells are small and uniform, delivering flexural strength of 18–25 MPa and screw-holding of 4.0–5.0 N·m — comparable to 12 mm construction plywood.

Density is controlled primarily by foaming agent dosage (more agent = lower density) and die temperature (higher die temperature = greater expansion before the skin solidifies). The extruder operator adjusts these two parameters to target the density required for the day's production run. Our latest industry news covers foam formulation innovations relevant to board manufacturers.

3. What are the utility requirements — power, water, compressed air, and floor space — for a complete line?

• Power: 380V three-phase. The SJS280/156 draws approximately 140–160 kW total for the complete line (extruder motor, calibrating platform drives, cooling frame rollers, haul-off, cutting saw, stacker, and chiller). The SJS292/188 draws approximately 200–230 kW. An independent electrical panel with proper overload protection is required.

• Water: The water chiller is a closed-loop system — it circulates the same water continuously and only requires a small makeup volume (approximately 100–200 liters per week to replace evaporation and minor leaks). A drain connection is needed for periodic chiller cleaning. No continuous freshwater supply is consumed during normal operation.

• Compressed Air: 0.6–0.8 MPa for the stacker's pneumatic clamping mechanism and the cutting saw's board clamp. A 3–5 HP rotary screw air compressor with a 200-liter receiver tank is sufficient.

• Floor Space: Allow a minimum of 28 × 4 m (SJS280/156), 31 × 4 m (SJS292/188), or 31 × 6 m (co-extrusion) for the line itself, plus additional space for raw material storage, dry blend mixing station, finished board storage, and forklift aisles. Total factory area for a single-line foam board operation is typically 400–600 m². We provide a dimensioned CAD layout drawing as part of every quotation. Our High-Output Single Screw Extruder page shows the motor and drive sizing philosophy used across our extruder product lines.

4. How long does it take to switch between board widths and thicknesses — and what's the downtime cost?

A width changeover (e.g., from 1,220 mm to 915 mm boards) takes approximately 2–3 hours and involves: (1) stopping the extruder and purging remaining melt (30 minutes); (2) swapping the flat sheet die to the new width specification (45–60 minutes — the die is hot and heavy, requiring two technicians and a crane or die cart); (3) adjusting the calibrating platform roller gap and replacing the roller set if the thickness specification also changes (30–45 minutes); (4) re-adjusting the cooling frame roller spacing across the new board width (20–30 minutes); (5) restarting extrusion and dialing in the parameters for the new board size (30 minutes).

A thickness-only changeover (e.g., from 18 mm to 25 mm on the same 1,220 mm width) is faster — approximately 1 hour — because the die stays in place and only the calibrating platform gap and haul-off speed need adjustment.

At 400 kg/hr, two hours of downtime costs approximately 800 kg of lost output — roughly 35 sheets of 18 mm board. Most factories therefore schedule width changes no more than once per week and run dedicated production campaigns of 5–7 days at a single width. Thickness changes can be done at shift change or during a scheduled maintenance window. The products page lists complementary equipment for multi-width factories.

5. What raw material formulation should I use for PVC foam board, and where do I source the components?

A standard PVC foam board formulation (parts by weight per 100 parts PVC resin):

• PVC resin: 100 parts (K-value 57–60, suspension grade — lower K-value than pipe-grade PVC, which uses K65–68)

• Calcium carbonate filler: 10–30 parts (800–1,250 mesh, treated with stearic acid coating for dispersibility)

• Chemical foaming agent: 0.3–0.8 parts (azodicarbonamide, decomposition temperature 195–205°C; use the modified grade with ZnO kicker to lower effective decomposition to 170–180°C)

• Ca/Zn stabilizer: 3–5 parts (non-toxic grade for indoor cabinet and furniture applications; lead-based stabilizers are prohibited in EU and North American markets)

• Acrylic processing aid: 5–8 parts (promotes melt strength for uniform cell structure)

• Foam regulator: 5–8 parts (acrylic copolymer, controls cell size uniformity)

• Internal lubricant: 0.5–1.0 parts (stearic acid or calcium stearate)

• External lubricant: 0.5–1.5 parts (PE wax)

• Titanium dioxide (optional): 2–5 parts (for white boards)

• Wood fiber (for WPC): 20–40 parts (80–120 mesh, moisture content below 1.5% — wood fiber is hygroscopic and must be dried separately at 100–105°C for 2 hours before mixing)

All components are commodity chemicals available from multiple suppliers globally. We provide a full formulation specification with recommended Chinese and international suppliers as part of the line commissioning package. The formulation can be adjusted for local raw material availability and cost — for example, increasing calcium carbonate filler to 30–40 parts reduces resin cost but also reduces flexural strength, so the balance is tailored to your target board density and application.

Getting started is straightforward: tell us your target board width, thickness, density, and application market, and we ship a complete line including the base formulation, processing parameters, and on-site (or remote video) startup support. For companies moving into foam board production for the first time, we recommend starting with the SJS280/156 single-layer configuration and one board width — typically 1,220 mm — and adding the co-extrusion option and additional widths as the order book grows. Our about us page details our 20+ year track record in plastic extrusion equipment.

Why Choose Chenxing Machinery

• Complete solution, not just a machine — the quotation includes the correctly sized water chiller (essential for foam board), raw material formulation with supplier sourcing, a CAD factory layout drawing, and 5 working days of on-site startup support. You are not left to figure out the cooling system, the recipe, or the factory layout on your own.

• Scalable investment path — start with the single-layer SJS280/156 at 400 kg/hr. When the business case supports visible-surface boards, add the co-extrusion extruder and distributor as a field-retrofittable upgrade. No need to buy a second complete line.

• Internationally standardized board formats — 915 mm, 1,220 mm, and 1,830 mm widths match global plywood and MDF dimensions, meaning your boards fit directly into customer cut-lists and container loading plans with zero trim waste.

• Remote support, rapid ramp-up — from uncrating to first production board in 5–7 days with video-guided installation and parameter setup. Our engineers dial in your foam formulation remotely and stay connected until your boards meet density, surface, and dimensional quality targets at the contracted output rate.

Get Your PVC WPC Foam Board Line Quotation

Ready to enter or expand in the PVC/WPC foam board market — serving cabinet manufacturers, formwork suppliers, door producers, or construction material distributors?

Step 1 — Define Your Product: Email ceo@cxsljx.com with your target board width(s), thickness(es), target density, application market, monthly output target (sheets or tons), and factory dimensions. Include whether you need single-layer or A+B+A co-extrusion capability. Response within 24 hours.

Step 2 — Receive Your Configured Proposal: Within 3 working days, receive a model recommendation, throughput projection for each board specification, chiller sizing calculation, dimensioned CAD factory layout, complete system quotation including all auxiliary equipment, and a formulation specification with international supplier recommendations.

Step 3 — Validate with Production Samples: Before shipment, we produce sample boards in your target thickness and density at our factory. You receive board samples for your own QC testing (density, flexural strength, screw-holding, water absorption), plus a video and data log documenting the full production run.

Step 4 — Commission to Commercial Quality: Our engineers oversee installation and commissioning — on-site or via live video — including recipe setup, operator training, and production of the first specification-grade boards. The line is released for commercial production only after your boards meet all quality targets at the full contracted output rate.

Contact us now: ceo@cxsljx.com | +86 159 5118 7228 | Chenxing Machinery