Low-shear PVC screw with corrosion-protected barrel for pipe fitting and valve injection. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
PVC is the most punishing commodity resin in injection moulding: it releases HCl at even moderate melt temperatures and stalls in any screw with too much compression. Our PVC-fittings screw uses a low-compression, low-shear profile with a polished channel so the melt never sits long enough to degrade.
Built for fittings, valves, elbows and electrical conduit bodies on 60–320 t machines. Tell us the machine brand and tonnage and we match the geometry — rigid or plasticised PVC, lead-free or tin-stabilised.
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 | Ø30–120 mm |
|---|---|
| Compression ratio | 1.8–2.2 (low-shear PVC profile) |
| Material | 38CrMoAlA nitrided, corrosion-protected bore |
| Barrel | Nitrided or bimetallic lining for hot PVC |
| Surface | Polished channel, anti-stick finish |
| Typical machines | Haitian, Chen Hsong, Engel, Arburg |
| Lead time | 25–35 days after drawing approval |
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 |
PVC degrades quickly above its processing window and releases HCl, which attacks steel. A low-shear geometry with a short residence time and a corrosion-protected bore prevents both the black specks and the barrel pitting.
Yes. Ca-Zn formulations are more shear-sensitive than lead-stabilised ones; we tune the compression ratio down slightly and recommend a polished channel.
Usually yes. Give us the brand, tonnage and material — if we have built for that model we can quote without a drawing.
Complete matched set for 90–450 t injection moulding machines, nitrided or bimetallic.
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High-compression PET screw with barrier tips, low acetaldehyde generation for bottle-grade preforms.
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Centrifugally cast 2–5 mm alloy lining for glass-filled and corrosive resins.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
