Method of injection molding polyethylene terephthalate

Details Method of injection molding polyethylene terephthalate Method of injection molding polyethylene terephthalate

B - Operations, Transporting

29

C

B29C 45/63 (2006.01) B29C 45/18 (2006.01) B29C 45/76 (2006.01)

Patent

CA 2143041

A method of injection molding polyethylene terephthalate without being predried or with having an irregular-shape wherein a vent type injection machine is employed and the vent is forcedly performed by vacuum suction within a range of a specified degree of vacuum, i.e. 50 to 150 torr (equal to 6666.1-19998.3 Pa.) and/or at the same time the material is forcedly fed by a feed screw having a specifically set revolution speed. According to the present invention, it is possible to provide an injection molding method in which an PET without being predried or with having an irregular-shape can be molded.

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