Degassing barrel with vent port for LDPE/HDPE with moisture or volatile content. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Moisture, printing ink residues and volatiles leave the melt as gas. A vented barrel with a machined degassing port lets that escape before the second compression stage, instead of leaving bubbles in your pipe wall or film.
We machine the vent at the position your line needs and pair it with a two-stage screw so decompression happens at the port, not downstream.
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.
| Bore diameter | Ø45–250 mm |
|---|---|
| Design | Two-stage with vent port |
| Vent position | Machined to your specification |
| Material | 38CrMoAlA nitrided / bimetallic |
| Vacuum connection | Optional port threading |
| Screw pairing | Two-stage screw supplied together |
| Lead time | 35–45 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 |
At the decompression zone of the two-stage screw — we calculate it with the screw design, so order barrel and screw together.
It removes most volatiles. Very wet feedstock still needs some pre-drying; we will tell you what to expect for your material.
Usually not economically — a vented barrel is a different bore layout. A replacement set is the practical route.
Complete set for PE/PP pipe, film, sheet and pelletizing extrusion lines.
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Grooved feed section for high-output HDPE pipe extrusion.
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Mixing-head screw for blown film and cast film lines.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
