About Kerke Extrusion: 2,000+ lines built in Nanjing since 2009

About Kerke extrusion in one paragraph

A machine builder, not a trading company. Screw elements, shafts, barrels and dies are machined in our own works; gearboxes are assembled and run in for 24 hours before they meet a screw; every line is tested with material, not only dry-run, and the test video and pellet sample travel with the machine.

That structure decides what we are good at. When a filler masterbatch line has to hold 88% CaCO₃ without surging, or a PET line has to keep IV through the die, the answer is usually a screw element, a barrel liner or a feeder setting — all of which we can change without waiting for a third party.

What we build

How a line gets specified

1. Material. Resin, filler or fibre, loading percentage, additive package. This decides screw geometry before anything else.
2. Output and pellet standard. kg/h at the die, pellet shape, dust limit, bulk density.
3. Configuration. One-stage or two-stage, L/D, torque class, feeding, pelletizing method, downstream.
4. Trial. 25–50 kg on the closest lab machine; the measured parameters become the commissioning baseline.

Only after step four do we put a guaranteed output figure in a contract. The reasoning behind the sequence is set out in the selection guide.

What we do not do

We do not sell used machinery, do not build injection moulding machines, and do not supply resin, filler or masterbatch. If your project needs one of those, we will say so at quotation stage rather than quote around it — that is the short version of what the about kerke extrusion section above describes as a machine builder. Capacity figures on this site are reference ranges measured at standard screw speed — see the terms of sale for how the guaranteed figure is fixed.

Where the lines run

Filler masterbatch in Bangladesh, India, Vietnam and Egypt; PET flake recycling in Egypt, Turkey and Uzbekistan; black masterbatch in Poland, Nigeria and Mexico; cable compound in the Middle East and North Africa; WPC and wood-plastic profiles in Vietnam and Indonesia; lab and pilot lines in Europe and Korea. The case studies record country, material, configuration and measured output for each published project.

Next step

Two pages follow from here: the factory for how the machine is built, and service for what happens after it lands. For a quotation, send the material and the target output — the form takes two minutes, and the reply includes the closest configuration we have already delivered.

Background on the machine class itself: twin-screw extruder.

FAQ