Machine · Two-stage SE/SE
Two-Stage Single Screw Line SE/SE
Single screw plus single screw: the first stage melts and compacts, the second degasses and pressurizes. Built for washed agricultural film and heavily printed material where a twin screw would wear out. A reference two-stage single screw page from Kerke.
Two-stage SE SE — workshop photo 1, Kerke workshop, Nanjing
Two-stage SE SE — workshop photo 2, Kerke workshop, Nanjing
Two-stage SE SE — workshop photo 3, Kerke workshop, Nanjing
Two-stage SE SE — workshop photo 4, Kerke workshop, Nanjing
Two-stage SE SE — workshop photo 5, Kerke workshop, Nanjing
Two-stage SE SE — workshop photo 6, Kerke workshop, NanjingQuick answer
SE/SE two-stage single screw lines handle PE/PP film, woven bag and low-bulk-density scrap at 200–2,000 kg/h: a compactor-fed first stage melts and degasses, the second stage filters and builds die pressure. It is the cheapest configuration that still produces saleable pellets from film.
Workshop photos and a running video — shot on our own lines, not stock images.
Parameter table
| Configuration | Stage 1 | Stage 2 | Output (kg/h) | Feed |
|---|---|---|---|---|
| SE-120 / SE-120 | 120 mm | 120 mm | 200–400 | Film, bag, rigid regrind |
| SE-150 / SE-150 | 150 mm | 150 mm | 400–800 | Film, woven bag |
| SE-180 / SE-180 | 180 mm | 180 mm | 800–2,000 | Woven bag, heavy film |
Reference output measured on the stated material family; subject to a material trial. Motor and torque values are per machine, not per screw shaft.
Why two stages for film
Film has a bulk density around 30–80 kg/m³. A single screw cannot draw it in, and a single-stage forced feeder still gives unstable output. The first stage in an SE/SE line is a compactor-fed extruder that densifies and melts; the second stage only filters and pressurizes — so output is stable and the screen changer does not see unmelted flakes.
What decides pellet quality here
Not the extruder — the upstream washing and drying. Moisture above 1% gives porous, smelly pellets regardless of machine quality. We quote washing lines together with the pelletizing line for this reason.
What this machine is normally bought for
FAQ
Why two single screws instead of one?
One screw cannot both plasticize cold, low-bulk-density film and pull a deep vacuum. Splitting the duties doubles the working length without doubling the wear cost.
How dirty can the input be?
Up to 5% contamination by weight with a screen changer and regular purging; above that, washing and drying upstream is cheaper than wear parts.
Is the output stable enough for film blowing?
Yes, with gravimetric feeding and a melt pump. Without a pump, pressure variation shows up as gauge bands.
Where these numbers come from
Screw diameters, speeds, motor ratings, torque and reference output come from the Kerke parameter table and the product master data sheet, and are cross-checked against commissioning records. Where a catalogue value and a trial value disagree, the trial value is the one we quote.
Reviewed by the Kerke process team, Nanjing. Page updated 6 November 2026.
Send 25–50 kg — we return pellets, a video and a report with the parameters we used, in 3–7 days.
Two-stage single screw — the short version
Note on two-stage single screw: what separates one machine from another is torque class, L/D and the wear package matched to your material, not the build standard. Shortlist from the tables, then confirm the choice on a trial with your own powder.
Planning an upgrade this quarter? Send the material and the target output — the configuration comes back within one working day.
Every quotation lists the wear package as a separate line, so its cost is visible from day one.
Questions are answered the same day, in English or Chinese.
Note on two-stage single screw: the data on this page was last verified on our own test line in Nanjing.
Not sure which two-stage single screw configuration fits? Describe the material and the pellet shape required — we answer with a recommendation, not a brochure.
Related on this site: Extrusion lines by application · Extruder selection guide · free extrusion line quotation · Wikipedia: Twin-screw extruder