Low-shear PET screw barrel for APET / PETG sheet and packing strap lines. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
PET sheet work is a moisture and IV game: too much shear and the intrinsic viscosity drops, the sheet yellows and the straps lose tensile strength. Our PET screw runs a low-compression, long-metering profile with polished channels to keep IV loss minimal at sheet output rates.
Built for APET / PETG thermoforming sheet, folding box and packing strap lines. Tell us the resin IV you buy and the sheet thickness you run and we match the geometry and barrel heating layout.
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 | Ø65–150 mm |
|---|---|
| L/D ratio | 28–33 |
| Compression ratio | 2.0–2.4, low-shear profile |
| IV loss | Minimised by gentle melting profile |
| Material | 38CrMoAlA nitrided / bimetallic for rPET sheet |
| Channel finish | Polished, anti-degradation |
| Lead time | 30–40 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 |
Significantly. High shear and long residence both break PET chains; a low-compression profile with a short, polished flow path keeps IV loss where your sheet spec allows.
Use a bimetallic barrel and expect more contamination handling; we deepen the feed slightly and can add a melt filtration recommendation to your line.
Send the extruder model, screw diameter and target strap width/thickness; we size the screw for the output you actually need.
Complete set for PE/PP pipe, film, sheet and pelletizing extrusion lines.
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Degassing barrel with vent port for LDPE/HDPE with moisture or volatile content.
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Grooved feed section for high-output HDPE pipe extrusion.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
