Twin Screw Extruder ABS PC Alloy Compounding Machine 600-800 kg h 12 Month Warranty for Plastic Modification

Alloying is a compatibility problem before it is a capacity problem

ABS and PC do not blend by themselves. They need a compatibiliser dispersed at the right shear, at the right temperature, in the right order. Add to that the residual monomer that PC carries and the moisture that ABS absorbs, and the machine has to do three jobs at once: disperse, devolatilise and keep the melt from degrading. Capacity only matters after those three are solved.

The melt train, stage by stage

Feeding is gravimetric on both polymer streams, so the alloy ratio stays where the formulation says. Melting is followed by a dispersive kneading section that breaks the compatibiliser down to the scale where it can sit at the interface. Filler, flame retardant or pigment is then added through a downstream side feeder, which keeps abrasive additives away from the high shear zone.

Two vent stages follow. The first is atmospheric and releases the bulk of the volatiles; the second runs deep vacuum and pulls residual monomer and moisture down to the levels that injection moulders notice as splay. An 80 mesh hydraulic screen changer then removes gels and contamination before the die.

Series data

Shaded frame covers the 600-800 kg/h band for ABS PC and similar engineering alloys.

Downstream and drying

Water ring pelletizing with a centrifugal dryer is the usual arrangement. Pellets leave below 0.3 percent moisture, which matters because PC hydrolyses readily. For transparent or light diffusion grades, the die and water system are cleaned separately to avoid cross contamination.

Where the quality risk sits

• Yellowing usually traces back to melt temperature spikes, not to the resin.
• Gels come from insufficient filtration or from dead spots in the die head.
• Poor impact values usually mean the compatibiliser was not dispersed early enough.
• Splay at the moulder is nearly always residual moisture, so verify the dryer before blaming the compound.

Programs we support

PC ABS for automotive interior and electronics housings, flame retardant ABS, PC light diffusion grades, HIPS and PBT compounds, and mineral or glass filled engineering alloys. Output is 600 to 800 kg/h on the 71.5 mm frame.

Send the alloy ratio, the additive package and the impact target, and we will propose the screw configuration and venting depth together.