PVC/CPVC/UPVC Injection Screw Barrel

The screw and barrel designs for PVC, CPVC, and UPVC are built around a common challenge: these materials are heat-sensitive, highly viscous, and corrosive when decomposed. The equipment prioritizes low shear, short residence time, and strong corrosion resistance. Screws feature small compression ratios and gradual transition zones to minimize frictional heat, while barrels use nitrided or bimetallic alloys with precise multi-zone cooling. This unified system is widely used to produce pipes, window profiles, plumbing fittings, valves, and electrical junction boxes.

The PVC/CPVC/UPVC injection screw barrel addresses the specific processing challenges of heat-sensitive vinyl compounds across construction, plumbing, and electrical applications. In PVC pipe fitting injection molding, the screw barrel's low-shear design prevents local overheating that can cause material decomposition and release of corrosive HCl gas. For CPVC compound processing used in industrial hot water piping systems, the controlled shear rates ensure complete plasticating without thermal degradation of the high-chloride content material. The UPVC window profile injection molding sector relies on these systems to produce complex profile geometries with consistent density distribution. Electrical junction box manufacturers use these screw barrels to produce insulating components that require precise dimensional control and excellent electrical resistance properties. The system's versatility allows processors to run PVC, CPVC, and UPVC on the same hardware platform with only minor adjustments to temperature profiles and shot settings.