Wear-protected parallel twin screw barrel for wood-plastic composite profile and board. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Wood flour is a grinding agent and moisture source at once. Our WPC package combines a bimetallic barrel with a screw profile that degasses and gels the composite gently — protecting the line from both abrasion and steam pockets in the melt.
Built for WPC decking, fencing, pergola profiles and foam-core WPC board with 50–80% wood content. Tell us your wood loading and profile size and we quote the right wear package.
Quote within one business day. We reply with a matching proposal, delivery date and price — no generic catalogue PDF.
Standard range shown. Every dimension below can be changed to your machine, resin and output — custom manufacturing is our daily business.
| Screw diameter | Ø65/130–92/188 mm classes |
|---|---|
| Barrel | Bimetallic lining 2–5 mm (standard for WPC) |
| Screw | Hardened lands, degassing-ready profile |
| Wood content | 50–80% wood flour / fibre |
| Vent | Optional vacuum degassing port |
| Lead time | 35–45 days |
The honest answer depends on your resin, not on price. Here is how we advise customers.
| Gas Nitrided (38CrMoAlA) | Bimetallic Alloy Lining | |
|---|---|---|
| Best for | Unfilled PE, PP, PS, ABS, virgin PVC | Glass-filled, mineral-filled, recycled, corrosive |
| Surface hardness | HV 900–1020, depth 0.45–0.7 mm | Alloy layer 2–5 mm, metallurgically bonded |
| Typical service life | Baseline | 3–5× baseline on abrasive resin |
| Cost | Lower | Higher, recovered through fewer stoppages |
| Certification | MTC with heat number | MTC + hardness records, third-party on request |
Bimetallic — wood flour with its mineral residues is abrasive enough that nitrided barrels age visibly within a year at WPC loadings.
At wood contents above roughly 50%, yes: moisture in the flour flashes to steam and must be vented or the profile foams unpredictably. We build the vent position to match your barrel layout.
Send the extruder model, profile weight per metre and line speed; we size the screw for your actual duty point.
For PVC pipe, profile and WPC extrusion on parallel twin-screw lines.
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Flight-profiled, match-marked pair for even plasticising.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
