Conical twin screw barrel for window and door profile lines with stable gelation. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Window profile is the most QC-visible PVC product there is — weld strength, impact and surface all track back to gelation. Our profile screws hold a stable gelation point with a profile-tuned compression curve and a polished, low-hang-up channel.
Built for 55/110 to 80/156 class extruders running white and coloured profile, laminated and foam-core. Tell us your extruder model and profile family and we match the set.
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.
| Models | SJSZ 55/110, 65/132, 80/156 |
|---|---|
| Design | Profile gelation curve, polished channel |
| Material | 38CrMoAlA nitrided / bimetallic option |
| Surface | Polished, anti-stick |
| Typical profiles | Window/door frame, siding, trunking |
| Lead time | 25–40 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 |
Not necessarily. Virgin rigid PVC at moderate CaCO₃ loading is mild; nitrided is standard. Move to bimetallic when you run high-filler, recycled or foam-core formulations.
Yes — we build for the common European conical geometries from drawings or samples; send the nameplate and worn parts.
On virgin rigid PVC, typically 2–4 years of two-shift running for a nitrided set; bimetallic lasts considerably longer on filled compounds.
Matched screw and barrel for SJSZ 51/105 conical twin extruders.
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Large-format conical twin set for big-diameter PVC pipe lines.
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Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
