Process and apparatus for injection molding

Details Process and apparatus for injection molding Process and apparatus for injection molding

B - Operations, Transporting

29

C

18/700

B29C 45/76 (2006.01) B29C 45/57 (2006.01)

Patent

CA 2000663

- 41 - PROCESS AND APPARATUS FOR INJECTION MOLDING ABSTRACT A system of injection molding by an injection machine with a mold comprises conventional fundamental steps including a material plasticising and metering step, a material injecting step and a material pressure-holding step, but with a additional feature in that a nozzle passage is interrupted midway therealong from communication between the interior of a machine body and a mold cavity, after the injecting step but while the material pressure-holding step is being carried out. The material pressure-holding step is carried out first using the injection machine per se operated with a plunger to exert a first non-stepped external or internal pressure on the entire injected material but second using another means for exerting a second non-stepped or stepped internal pressure on a forward portion of the injected material separated due to the nozzle passage interruption.

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