Color masterbatch production with planetary roller extrusion
Colour masterbatch production — concentrating pigments at 20–70% loading into a carrier resin for let-down into polyolefin, PVC, or engineering resin production — is simultaneously a high-mix, high-value-add operation and one of the most operationally demanding in the plastics industry. A typical colour masterbatch producer runs 20–80 colour formulations per month, each in lot sizes of 200–2,000 kg, with strict colour matching requirements (ΔE ≤ 1.5 CIE Lab for most catalogue colours).
The key operational challenge is colour change: transitioning the production equipment from one pigment system to another without carry-over contamination that fails the colour specification of the incoming lot. Twin screw compounders require 25–50 kg of purge material and 30–60 minutes downtime per colour change depending on the pigment systems involved. Internal mixer/single screw lines require disassembly of the mixing chamber for dark-to-light colour changes — 2–4 hours of downtime per change.
The PLATEX planetary roller extruder addresses this through its self-cleaning roller geometry. The planetary roller’s continuous wiping action removes pigment carry-over progressively — there are no screw-root blind spots or corner dead zones where pigment can accumulate. Colour changes from one pigment system to the next typically require 10–20 minutes and 15–40 kg of purge material depending on the colour sequence and carrier resin. For a masterbatch producer running 6 colour changes per shift, the difference between 20-minute and 40-minute change cycles is 2 additional production lots per shift per line.
The PLATEX 100 (100–200 kg/hr) is the most frequently selected model for colour masterbatch producers with high-mix, small-to-medium lot requirements. The PLATEX system overview covers the full range.
Why planetary outperforms twin-screw for colour masterbatch
Colour change speed: The PLATEX self-cleaning geometry wipes all processing surfaces continuously. When the incoming pigment is replaced with purge compound, every surface that pigment has contacted is being wiped clean in real time. Twin screw compounders have intermeshing flight surfaces that retain pigment at the screw-root radius — these surfaces are cleared only as the screw flight itself passes, which takes multiple rotations per screw-length section. At equivalent throughput and purge compound volume, the PLATEX transitions to clean output in less time than a twin screw.
Dispersion quality for sensitive pigments: High-surface-area pigments — carbon black, phthalocyanine blue, quinacridone red — require break-up of primary aggregates (0.1–1 µm) into primary particles (20–50 nm). This requires shear energy, but excessive shear damages aggregate structure and causes colour strength loss. The PLATEX’s film-forming wetting mechanism provides distributive mixing across the full melt film surface, achieving primary aggregate break-up without the excessive peak shear that causes strength loss on high-speed twin screw equipment.
Low-shear-sensitive pigments: Pearlescent pigments (mica-based platelet, 10–50 µm diameter) and aluminium flake metallics depend on preserving platelet aspect ratio for optical effect. High shear on twin screws breaks platelet edges and reduces aspect ratio, diminishing the pearl or metallic effect. The PLATEX’s lower specific shear stress preserves platelet integrity 30–50% better than equivalent twin screw operation (estimated by aspect ratio measurement of let-down plaques).
PVC carrier compatibility: Colour masterbatch for PVC applications uses a PVC carrier rather than PE or PP. PVC-carrier masterbatch requires the same low-temperature, low-shear processing constraints as rigid PVC compound — the PLATEX’s thermal control advantage over twin screw applies here as well. See rigid PVC compounding for the full PVC processing comparison.
Energy at small lot scale: At 150 kg/hr on standard PE carrier masterbatch, PLATEX 100 total draw is approximately 35–40 kW. Twin screw equivalent draws approximately 40–45 kW. The energy difference is modest at this scale, but the faster colour change cycle and lower purge material consumption per colour change represent a larger cost saving.
See PLATEX vs twin-screw for a full technical comparison.
Recommended PLATEX models
For high-mix colour masterbatch production with frequent colour changes (4–10 per shift), the PLATEX 100 (100–200 kg/hr, 45 kW) is the primary specification. The PLATEX 100’s compact footprint (280 × 260 × 150 cm) and self-cleaning geometry make it the most efficient masterbatch production unit in the PLATEX range on a cost-per-colour-change basis.
For higher-volume catalogue masterbatch production (fewer colour changes per shift, larger lot sizes), the PLATEX 155 (450–800 kg/hr) and PLATEX 165 (600–1,100 kg/hr) are appropriate. The PLATEX 165 handles TiO2 white at 60% loading (50 phr CaCO3 in some white masterbatch formulations) within its motor envelope.
For formulation development of custom colour systems — new pigment chemistries, pearlescent blends, UV-stable colour concentrates — the PLATEX 80 lab extruder (max 45 kg/hr) allows colour development with 2–5 kg pigment samples before committing to production lot scale.
Run your formulation in our lab
Send a 2–5 kg sample of your pigment system and carrier resin to Takımsan’s İstanbul facility. Our team runs it on the PLATEX 80 lab extruder and report dispersion quality (visual assessment, let-down plaque preparation), colour strength versus reference standard, and process recommendations. For pearlescent or metallic pigment systems, SEM imaging of pellet cross-section is included. Contact Takımsan to arrange a sample run.
