Application · Plastic Masterbatch
White Masterbatch Line: 50–70% TiO2 Without Agglomerates
Titanium dioxide is the one filler that fails visibly: 63% loading with poor wetting gives white specks in a black film, and no amount of filtering saves the batch. A reference white masterbatch line page from Kerke.
White Masterbatch Line — workshop photo 1, Kerke workshop, Nanjing
White Masterbatch Line — workshop photo 2, Kerke workshop, Nanjing
White Masterbatch Line — workshop photo 3, Kerke workshop, Nanjing
White Masterbatch Line — workshop photo 4, Kerke workshop, Nanjing
White Masterbatch Line — workshop photo 5, Kerke workshop, Nanjing
White Masterbatch Line — workshop photo 6, Kerke workshop, NanjingQuick answer
White masterbatch carries 50–70% TiO2 on a twin screw with L/D 44–48, high-shear dispersion and water ring pelletizing. Output 200–1,200 kg/h. The limiting factor is usually TiO2 grade and surface treatment, not machine torque.
Workshop photos and a running video — shot on our own lines, not stock images.
What sets the limit
TiO2 is metered with a twin-screw feeder, wetted in a melt seal, dispersed through a high-shear block, vacuum devolatilized to remove moisture, filtered and pelletized.
| Parameter | Value / range |
|---|---|
| TiO2 loading | 50–70% (rutile, surface-treated) |
| L/D | 44–48 |
| Temperature | 170–200 °C |
| Pelletizing | Water ring or strand |
| Output (reference) | 200–1,200 kg/h |
| Model | KTE-65B, KTE-75B |
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 170–200 °C.
- 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 packingWater ring or strand; 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. Moisture in TiO2 causes voids and die build-up
Moisture in TiO2 causes voids and die build-up — specify a dryer on the feeder, not just a vent.
2. Screen packs blind quickly at 70%: plan a continuous screen changer.
Screen packs blind quickly at 70%: plan a continuous screen changer.
3. Standard elements at 70% TiO2
Standard elements at 70% TiO2 — plan PM elements in the melt zone and a 2,500 h inspection, or output drifts and hiding power fades batch to batch.
FAQ
Why does my white masterbatch look grey?
Usually insufficient dispersion or contaminated screens. Check filter pressure and screw configuration before blaming the TiO2.
Can I run white and black on the same line?
Not practically. Pigment contamination in a white line is permanent; customers keep a dedicated white line.
What output can you guarantee for this application?
The reference band is 200–1,200 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.
White masterbatch line — the short version
Note on white masterbatch 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