Long single screw for polystyrene foaming extruders. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Foaming screws are long for a reason: the blowing agent has to dissolve completely before the melt reaches the die. We build long-L/D screws with a polished profile so the melt arrives homogeneous and at a stable temperature.
Designed around your blowing agent and target output.
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 | Ø65–300 mm |
|---|---|
| L/D ratio | Long, per foaming requirement |
| Material | 38CrMoAlA nitrided |
| Finish | Polished channels |
| Design | For CO₂ or HFC blowing agent |
| Output | Matched to your line |
| Lead time | 35–50 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 |
The blowing agent needs length and pressure to dissolve fully. Too short and you get uneven cell structure in the board.
Yes — send the drawing or the worn screw and we reproduce or improve it.
Rising melt temperature, falling output and uneven cell structure are the usual signs. Send us photos and measurements and we assess them.
Big-format XPS screw sets, max machining diameter Ø300 mm in-house.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
