KNEADING APPARATUS, METHOD FOR PRODUCING THERMOPLASTIC RESIN MOLDED PRODUCT, AND FOAM INJECTION MOLDING METHOD

摘要

A kneading apparatus for a thermoplastic resin, includes: a plasticizing cylinder which has a high pressure kneading zone and a pressure reduction zone; a screw in the plasticizing cylinder; a downstream side seal mechanism which shuts off communication between the high pressure kneading zone and the pressure reduction zone; and a pressure reduction zone pressure adjusting mechanism which is connected to the pressure reduction zone and which controls a pressure of the pressure reduction zone so that the pressure is not less than an atmospheric pressure and the pressure is not more than a maximum pressure of the high pressure kneading zone that is achieved when kneading a molten resin with a pressurized fluid, when the downstream side seal mechanism shuts off the communication between the high pressure kneading zone and the pressure reduction zone.

主权项

1. A kneading apparatus for a thermoplastic resin, comprising:
a plasticizing cylinder which has a high pressure kneading zone, and a pressure reduction zone; a screw which is arranged rotatably and movably back and forth in the plasticizing cylinder; a downstream side seal mechanism which is provided between the high pressure kneading zone and the pressure reduction zone; and a pressure reduction zone pressure adjusting mechanism which is connected to the pressure reduction zone of the plasticizing cylinder and which controls a pressure of the pressure reduction zone to a predetermined value.