Planetary screw barrel for rigid PVC calendering feed and large-area sheet lines. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Calendering feed demands a melt that is homogeneous, degassed and temperature-flat — exactly what a planetary roller stage does best: the rolling spindles knead the PVC over the full bore at low shear. We build planetary screw-spindle-barrel sets for calendering feed duties.
Built for rigid and semi-rigid PVC sheet feed, flooring base layers and calendering trains. Send the machine model or planetary section dimensions and we quote 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.
| Screw diameter | Ø100–250 mm typical |
|---|---|
| Spindle count | 6–12 rolling spindles |
| Material | Nitrided spindles; bimetallic bore option |
| Melt quality | Homogeneous, low-shear, temperature-flat |
| Typical duty | Calendering feed, sheet lines |
| Lead time | 40–55 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 rollers knead over the whole melt volume at low shear: excellent homogeneity without heat spikes — exactly what a calender wants at the bank.
Yes — spindle re-grinding and re-nitriding where the wear allowance allows; we inspect and quote both routes.
Recommended where the compound carries filler; the rollers and bore wear as a pair.
For planetary roller extruders in rigid PVC compounding and calendering.
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Central spindle with helical flights matched to the roller set.
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Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
