Process for injection molding polyethylene terephthalate

Details Process for injection molding polyethylene terephthalate Process for injection molding polyethylene terephthalate

B - Operations, Transporting

29

B

B29B 11/08 (2006.01) B29C 45/00 (2006.01) B29C 45/60 (2006.01) B29C 45/63 (2006.01)

Patent

CA 2186441

There is provided a process for injection molding a preform for stretch blow molding a thin-wall vessel such as a bottle using amorphous polyethylene terephthalate (A-PET) as a molding material, wherein a required amount of crystallized polyethylene terephthalate (C-PET) is added to the A-PET. The resulting mixture material can be easily plasticized to increase the IV value of the molding material to a value higher than that of A-PET so as to injection mold the preform. A-PET which is hardly usable as a molding material for stretch blow molding due to its low IV value is made usable as a molding material for stretch blow molding by increasing its IV value making use of plasticization at the time of injection molding.

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