Machine · Spare parts & auxiliary equipment
Extruder Spare Parts & Auxiliary Equipment
Screw elements, barrels and shafts are the parts that wear — we keep the common sizes in stock and machine the specials in our own workshop. Mixers, pelletizers and line fittings come from the same floor, so one purchase order covers the extruder and everything around it.
Spare parts warehouse — gearboxes, motors and stock assemblies
Screw elements and barrels on stock racks
CNC turning of screw shafts and elements
Machining centre with barrel liners
Barrel castings before finish machining
Robot welding station for tanks and skidsQuick answer
Kerke stocks screw elements, barrels and shafts for KTE twin-screw and SE single-screw extruders — stock parts dispatch in 24–48 h, and specials are machined from a drawing or a used sample in 15–25 days. The auxiliary range — SHR hot and cool high-speed mixers (5–1,000 L), strand and die-face pelletizers, screen changers and line fittings — is built in the same workshop, quoted with the extruder line so nothing is a surprise at commissioning.
Wear parts — screw elements, barrels, shafts
These three decide whether the line holds its output after a year of abrasive filler. We build them ourselves, so the material is specified for your recipe rather than taken from a catalogue.
| Part | Typical material | Fits | Note |
|---|---|---|---|
| Screw elements (螺套) | W6Mo5Cr4V2, HRC 58–62; 38CrMoAlA nitrided for standard duty | KTE 35–95 twin screw, SHJ, SE | Building-block segments: conveying, kneading, mixing, zoning. Wear zone sets sold per recipe. |
| Barrels (机筒) | 38CrMoAlA nitrided; bimetal liner (HIP) for high-filler | Matched to screw Ø and centre distance | Closed, vented and side-feeder barrels; heater collars and thermocouple bores as originals. |
| Shafts / cores (芯轴) | 42CrMo quenched and tempered, involute splined | KTE, SHJ, SE series | Six-tooth involute spline; new shafts or straightness restored on request. |
Not sure of the segment codes? Send a photo of the worn element and the extruder model — we identify the set from the wear pattern.
In stock or made to order
| Item | Stock | Custom |
|---|---|---|
| Screw elements, common KTE sizes | 24–48 h dispatch | 15–25 days from drawing or sample |
| Barrels, nitrided / bimetal | Common lengths in stock | 20–30 days per drawing |
| Splined shafts | SE / KTE common sizes | 15–25 days |
| Heater bands, thermocouples, seals | In stock | — |
| Die plates, screen changer plates | 48 h for standard plates | Per drawing |
Custom work starts from either a drawing or a physical part: we measure, reverse the segment geometry, quote within one working day and machine in our own CNC shop — no third-party foundry queue.
Auxiliary equipment
High-speed mixers (高混机). SHR hot-mix and hot/cool combination units, 5–1,000 L, for powder premix, masterbatch and PVC compounding. Stainless contact parts, jacketed for cooling, with the same PLC family as the extruder line.
Pelletizing units (切粒). Strand pelletizers, water-ring and die-face cutters matched to the extruder output; spare knives, die plates and strand guides stocked for every machine we ship.
Line fittings (配件). Screen changers, gravimetric feeder screws, water baths, air knives, gearboxes, heater bands and seals — the parts that keep the line fed, cut and dry, quoted as a set with the main machine.
FAQ
Are screw elements made in-house?
Yes. Building-block elements, shafts and barrel liners are machined in our own workshop — the CNC shop you see on this page. Standard KTE sizes are stocked; specials are quoted from a drawing or a sample within one working day.
What spare parts should be stocked?
One set of screw elements for the wear zone, one die plate, heater bands, thermocouples, and a gearbox oil filter set. That covers 90% of unplanned stops.
Do you supply the water and air systems?
Water ring and underwater systems include the pump, tank and heat exchanger as a skid; compressed air and chilled water supply to the skid are by the customer.
We confirm stock, price and lead time within one working day — for a full line, include the target output and material.
Spare parts — the short version
What keeps a compounding line profitable is not the extruder spec sheet — it is how fast worn elements, barrels and shafts are back on the machine. We stock the common sizes, machine the specials in-house, and build the mixers and pelletizers around the extruder so the whole line is supported by one supplier.
Related on this site: Pelletizing systems (all 7 methods) · Full machine range · free extrusion line quotation