Parallel twin screw barrel for large-diameter uPVC pipe and mWPC pipe lines. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Large-diameter PVC pipe lines run parallel twins where output and melt uniformity matter over long shifts. Our pipe-profile screws give a stable, fully gelled melt at high throughput — with the conical-style low-shear character PVC needs, in a parallel layout built for sustained line speeds.
Built for Ø63–630 mm and larger pipe. Send the extruder model (SJSZ or your brand) and pipe range and we quote a matched set, bimetallic if you run recycled or filled compounds.
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 |
|---|---|
| Centre distance | Matched to extruder model |
| Design | PVC gelation profile, low shear |
| Material | 38CrMoAlA nitrided / bimetallic option |
| Hardness | HV 900–1020 nitrided; 2–5 mm alloy lining option |
| Typical lines | uPVC pipe Ø63–630 mm+ |
| Lead time | 30–45 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 |
Conical dominates small-to-medium pipe for its low shear at the tips; parallel wins on large-diameter, high-output lines where the longer metering zone helps. Tell us the pipe diameter and we will say which suits.
Yes — we build for the common SJSZ parallel range and most Chinese and European parallel twin extruders.
If you run calcium-carbonate-heavy or recycled compounds, yes. For virgin rigid PVC at moderate output, nitrided remains standard.
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.
