Counter-rotating twin-screw screw extruder

for the plastics industryfor PVCfor polypropylen

Counter-Rotating Twin-Screw Extruders are characterized by their positive displacement conveying, exceptional self-cleaning capabilities, controllable shear and temperature profiles, and strong pressure generation. This technology holds an irreplaceable position for processing heat-sensitive materials (especially PVC), performing high-pressure extrusion molding, and handling formulations with high filler content or requiring frequent material changes. Working Principle The barrel is composed of multiple split-type cylinder units with open and closed holes, designed as a clamshellstructure for easy access. The unique screw structure adopts a modularcombination, providing two meshing configurations: fully open (longitudinal and transverse) and fully closed between screws. The screws rotate outward in opposite directions (can be designed for inward counter-rotation based on materials), generating a calendering effect that enables gentle low-temperature shearing of materials. Using modularassembly, the shaft connects various screw elements (conveying elements, kneading elements, tooth-shaped elements, counter-flow elements, etc.) in series to form melting, intensive mixing, and venting sections. Advantages > Use a twin-screw feeder to ensure uniform and stable feeding; > Strong kneading capability for excellent mixing, gentle shearing, and precise temperature control. > Short L/D ratio for material heat preservation and mild processing. > Adapts to multiple formulations without hardware changes and enables quick product switching. > Split-type barrel design facilitates easy maintenance with short downtime.