Application · Plastic Modification
Plastic Modification Line: Filled, Reinforced, Toughened, FR
Filled, reinforced, toughened and flame-retardant compounds can run on one platform — the difference is where the additives enter the barrel and how much vacuum you pull afterwards. A reference plastic modification line page from Kerke.
Plastic Modification Line — workshop photo 1, Kerke workshop, Nanjing
Plastic Modification Line — workshop photo 2, Kerke workshop, Nanjing
Plastic Modification Line — workshop photo 3, Kerke workshop, Nanjing
Plastic Modification Line — workshop photo 4, Kerke workshop, Nanjing
Plastic Modification Line — workshop photo 5, Kerke workshop, Nanjing
Plastic Modification Line — workshop photo 6, Kerke workshop, NanjingQuick answer
Plastic modification covers filling, reinforcement, toughening and flame retardancy on one twin-screw platform at 100–3,000 kg/h. The differentiation is the screw configuration, feeder arrangement and downstream units — not a different machine for each product.
Workshop photos and a running video — shot on our own lines, not stock images.
What sets the limit
Base resin is melted in the first barrels, fillers or fibres are added downstream to avoid attrition, the melt is devolatilized and pelletized. Impact modifiers are added with a low-shear mixing block to protect the rubber phase.
| Parameter | Value / range |
|---|---|
| Modification types | Filled / GF reinforced / toughened / flame retardant |
| Output | 100–3,000 kg/h |
| L/D | 36–52 |
| Downstream | Side feeder, vacuum vent, screen changer |
| Model | KTE-52B to KTE-95D |
| Pelletizing | Strand or underwater |
Output figures are measured on the reference material stated above. Filler grade, bulk density and moisture move output by ±15% — that is why every quotation we issue is tied to a trial report.
Process flow, step by step
- FeedingLoss-in-weight dosing of polymer and filler; side feeder or liquid injection where the formulation needs it.
- Melting and dispersingScrew geometry with 45°/90° kneading blocks; barrel profile set by the polymer.
- DevolatilizationVacuum vent at −0.06 to −0.09 MPa removes moisture and volatiles before the die.
- Pressure build-upThrottle or discharge section stabilises die pressure; a melt pump where gauge control matters.
- Pelletizing and packingStrand or underwater; then centrifugal dryer, vibrating screen and bagging.
Equipment configuration
| Stage | Equipment | Why this choice |
|---|---|---|
| Main machine | Co-Rotating Twin Screw Extruder | Architecture follows the filling level and the mixing duty, not the required tonnage. |
| Screw geometry | Building-block elements, W6Mo5Cr4V2, bimetallic liner | Wear package for abrasive filler; mixing blocks only where dispersion demands them. |
| Feeding | Loss-in-weight feeder, side feeder where needed | Recipe accuracy: ±0.5% short term on the weighed component. |
| Pelletizing | Pelletizing system | Chosen by polymer and filler ceiling — water contact is the deciding column. |
| Downstream | Centrifugal dryer, vibrating screen, bagging | Fines below 2% and moisture below the specification of your downstream process. |
Output by model
| Model | Dia. (mm) | Speed (rpm) | Motor (kW) | Torque (N·m) | Output (kg/h) |
|---|---|---|---|---|---|
| KTE-50B | 50.5 | 500–600 | 55–75 | 2×525 | 80–200 |
| KTE-50D | 50.5 | 300–800 | 75–90 | 2×860 | 100–300 |
| KTE-52B | 51.4 | 500–600 | 55–75 | 2×720 | 80–200 |
| KTE-52D | 51.4 | 500–600 | 75–110 | 2×1050 | 100–400 |
| KTE-65B | 62.4 | 500–600 | 90–110 | 2×860 | 200–450 |
| KTE-65D | 62.4 | 300–800 | 132–160 | 2×1530 | 350–600 |
| KTE-75B | 71 | 500–600 | 132–160 | 2×1530 | 300–800 |
| KTE-75D | 71 | 300–800 | 200–315 | 2×2100 | 500–1000 |
| KTE-85B | 85 | 500–600 | 220–315 | 2×2100 | 550–1000 |
| KTE-95B | 93 | 500–600 | 250–315 | 2×3000 | 800–1500 |
| KTE-95D | 93 | 500–800 | 315–500 | 2×4800 | 1000–2000 |
| KTE-135B | 135 | 500–600 | 315–500 | 2×4800 | 1500–3000 |
| KTE-135D | 135 | 500–800 | 500–1000 | 2×7800 | 1500–4000 |
Three mistakes that cost the most
1. Feeding glass fibre into the hopper
Feeding glass fibre into the hopper — fibre length collapses and impact strength halves.
2. Over-shearing impact modifiers: the rubber domain size drops below the toughening threshol
Over-shearing impact modifiers: the rubber domain size drops below the toughening threshold.
3. Guaranteeing output without a trial
Guaranteeing output without a trial — filler grade, bulk density and moisture move output by ±15%; the trial report is what turns a reference value into a contract number.
FAQ
One line for PP+GF and PC/ABS?
Possible but compromised. PC/ABS needs higher torque and different mixing; most plants keep separate screw sets and swap them.
What output can I expect for 30% GF PA6?
Roughly 60–70% of the unfilled output at the same screw speed, because of fibre feeding limits and die pressure.
What output can you guarantee for this application?
The reference band is 100–3,000 kg/h, measured on the stated material. We quote a guaranteed figure only after a trial on your own material, because filler grade, bulk density and moisture move output by ±15%.
Can we run our material before ordering?
Yes — send 25–50 kg. We return pellets, a running video and a report with temperatures, screw speed, feeder settings and output per hour. The trial is free; you cover the freight.
What is the delivery time?
30–45 working days for standard configurations, 45–70 for custom screw geometry and ODM work. Voltage and frequency are built for the destination country.
Where these numbers come from
Parameters are taken from the Kerke product parameter table and the product master data sheet, and cross-checked against commissioning records for lines in the same application. Formulations and temperature windows are typical industry values, not a recommendation for your specific compound — every figure marked reference must be confirmed on a material trial before it becomes a contractual number.
Reviewed by the Kerke process team, Nanjing. Page updated 6 November 2026.
Send 25–50 kg and we run it on our lab extruder: pellets, running video and a capacity report back in 3–7 days.
Plastic modification line — the short version
Note on plastic modification line: the numbers above are reference ranges from Kerke's own trial runs, not catalogue promises. Screw geometry, wear package and pelletizing method are set on the trial bench first, so the output you compare is the output you get. If your grade is not in the tables, send it — the closest configuration is usually a change of screw set, not a different machine.
Related on this site: Machine range: KTE-50B to 135D · Pelletizing methods compared · quotation and free trial · Wikipedia: Masterbatch