Extruder.

摘要

an extruder in which the joint between the downstream, forward end portion of a cylinder (2) and a gear pump (8) is always kept tight, so that molten resin material is prevented from leaking out. As the main discharge port of a diverter valve (9) is prevented from shifting from the inhalation port of the gear pump (8) at the joint therebetween, the flow passage at the joint is always smooth without a spot where the molten resin material collects. The quality of resin products thus becomes stable.