Welcome to ANDA
Welcome to ANDA
Export-quality wood plastic composite decking is shaped long before the profile reaches the cooling table. Recycled plastic must melt steadily, wood flour must be dry and evenly sized, and additives must be measured with care. When these basics are controlled, a WPC decking production line can hold board weight, surface finish, locking dimensions, and color through a full shipment.
A written acceptance standard gives the production team a clear basis for approving each delivery. Record the supplier, batch number, polymer type, moisture level, particle size, bulk density, and visible contamination before storage.
PE, PP, and PVC should not be mixed casually. They melt differently, so an unknown blend may cause unstable pressure, rough surfaces, weak ribs, or brittle edges. Sort recycled plastic by polymer family, then wash, dry, and reduce it to a consistent flake, regrind, or powder size. Magnets and screens can remove metal, stones, paper, and other debris.
Mixed particle sizes may bridge in the feeder or create uneven flow. A screened grade feeds more smoothly and gives the polymer a consistent fiber surface to coat. Water trapped in the compound turns to steam in the extruder and may leave pinholes, internal voids, or a foamed edge.
Control point | Factory check | Risk when missed |
Polymer identity | Label each stream | Pressure swings |
Wood-flour moisture | Test every batch | Bubbles and voids |
Particle size | Sieve check | Bridging |
Contamination | Magnet and visual check | Die damage |
Additive dosing | Calibrated weighing | Color drift |
Anda’s WPC Decking Production Line can use an automatic vacuum feeder and a precision twin-screw metering feeder. Closed transfer reduces dust, while variable-speed dosing helps high-viscosity WPC material enter the extruder evenly without bridging or blockage.
Charging order, blade action, batch temperature, and cooling speed affect how well recycled plastic, wood flour, pigment, lubricant, and coupling agents are distributed.
Operators should follow one approved sequence and record batch time, motor current, discharge temperature, and material appearance. Low-dose additives need accurate pre-weighing. Color changes also require cleaning so residual pigment does not carry into the next order.
A simple checklist includes:
· confirm the previous batch has discharged;
· add ingredients in the approved order;
· watch motor load for clumping;
· discharge at the validated temperature;
· inspect the blend before transfer.
Hot material should not remain in a pile. Slow cooling can cause caking and moisture pickup. A hot mixer followed by a cold mixer creates a controlled handoff and prepares the compound for stable feeding.
Anda’s mixing unit uses SUS304 stainless-steel contact surfaces, polished inner walls, and three-piece cast stainless-steel blades. Under suitable conditions, the high-speed mixer can form a uniform blend in about ten minutes. Its honeycomb water-cooling jacket is designed to cool material from roughly 120°C to 45°C quickly.
The process route depends on how clean and stable the recycled feedstock is. Direct extrusion cuts handling, while pre-compounding may help when raw-material variation is harder to control.
A one-step route works when plastic identity, wood-flour moisture, particle size, and dosing are stable. The prepared blend moves directly to profile extrusion. A two-step route first forms pellets or agglomerates, adding one process but creating a more uniform feed.
WPC melt is thick, abrasive, and sensitive to excess heat. Screw speed and barrel temperature should be high enough for full plastication but not so high that the wood fiber darkens. Burnt odor, black streaks, or falling output often point to local overheating. Steam near the vent usually indicates wet wood flour.
Anda’s WPC Decking Production Line uses a conical twin-screw extruder with screw-core oil cooling and multi-stage forced-air barrel cooling. This two-way temperature-control design reduces local hot spots and lowers the risk of wood-fiber carbonization during continuous production.
A stable compound can still produce rejected boards when die flow, vacuum calibration, haul-off speed, or cutting length is inconsistent. These downstream steps must work as one system.
The die must distribute melt evenly through the top skin, ribs, hollow chambers, and locking edges. The hot profile then enters a vacuum calibration table, where vacuum holds the geometry and separate water circuits remove heat. Uneven cooling may twist the board or change joint dimensions.
Rubber caterpillar belts should pull without slipping or crushing the profile. Haul-off speed must follow extrusion output. Optional online embossing can press a deep wood-grain texture while the surface remains warm. The cutter should hold repeat length without leaving heavy dust.
Anda’s line can include a high-precision WPC profile die, a 4-meter or 6-meter stainless-steel vacuum calibration table, a variable-speed caterpillar haul-off, optional online embossing, a dust-controlled cutter with accuracy within ±1 mm, and an automatic stacker that reduces surface scratching.
Final inspection should confirm that the beginning, middle, and end of the run meet the same standard. Export buyers usually care about repeatable dimensions, consistent color, clean surfaces, reliable locking, and safe packing.
Record feeder rate, screw speed, temperatures, melt pressure, vacuum level, cooling-water temperature, haul-off speed, and board weight per meter. Check width, thickness, straightness, wall thickness, locking fit, cut length, color, embossing depth, and surface defects.
Sampling should cover several points in the run. Square stacks, separators, moisture-resistant wrapping, and traceable labels help protect the goods during container loading and transport.
Because Anda’s WPC Decking Production Line links metering, extrusion, calibration, haul-off, cutting, and stacking, process changes can be traced across the complete line. The integrated layout supports consistent board geometry and makes routine quality records easier to maintain.
Zhangjiagang Anda Machinery Co., Ltd. manufactures WPC Decking Production Line equipment for wood plastic composite profile production. Its supply scope can cover mixing, automatic feeding, conical twin-screw extrusion, profile forming, vacuum calibration, haul-off, optional embossing, precision cutting, and stacking.
The line can be configured around polymer type, wood-flour ratio, board drawing, target output, surface pattern, workshop layout, and utility conditions. Buyers are welcome to watch the Anda WPC Decking Production Line video to review the equipment sequence and production workflow.
Anda can provide a coordinated line rather than isolated machines. Matching the mixer, feeder, extruder, die, cooling table, haul-off, cutter, and stacker to the same product specification reduces commissioning gaps and simplifies operator training.
Export-ready WPC decking begins with disciplined material preparation. Keep recycled polymers separate, dry and screen the wood flour, weigh additives accurately, cool the blend quickly, and store each batch to prevent moisture return. These steps reduce pressure fluctuation, bubbles, color drift, and dimensional variation.
The line must carry that consistency through extrusion, calibration, haul-off, embossing, cutting, and stacking. A stable process is easier to inspect and less likely to create costly rework.
Anda’s WPC Decking Production Line brings these stages into one coordinated system, with controlled feeding, twin-screw extrusion, targeted cooling, accurate cutting, and optional surface embossing. The project can be configured around the actual formula and decking profile.
The exact target depends on the polymer, formula, venting, and storage method. The practical standard is a low, repeatable level that produces no steam at the vent, internal voids, or moisture-related pinholes during trial production.
Uncontrolled mixed plastic should be avoided. PE, PP, and PVC have different melting behavior and additive needs. Each stream should be identified, tested, and processed under its own validated formula.
No. Clean, dry, and consistently dosed material may run through a one-step process. Pre-compounding is useful when recycled feedstock varies or tighter color and output stability are needed.
A typical line may include mixing, vacuum feeding, precision metering, a conical twin-screw extruder, profile die, vacuum calibration table, caterpillar haul-off, cutter, and stacker. Online embossing can be added for a deep wood-grain finish.
