Method for injection molding polyethylene terephthalate

Details Method for injection molding polyethylene terephthalate Method for injection molding polyethylene terephthalate

1994-05-02

1997-01-28

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

26421123, 264349, 366 89, 425203, 425208, B29C 4776, B29C 4782

Patent

active

055975259

ABSTRACT:
A method for injection molding polyethylene terephthalate by employing a vent type injection unit as means for omitting preliminary drying the resin, wherein the unit does not develop a poor screw biting, and even when the molding material is an undried uncrystallized or crystallized PET, can feed a certain amount of the material at all times to injection mold a desired transparent molded form such as a preform, and use the preform to produce a thin-wall container at a low cost.

REFERENCES:
patent: 3023456 (1962-03-01), Palfey
patent: 3826477 (1974-07-01), Kunogi et al.
patent: 4143974 (1979-03-01), Strassheimer
patent: 4670203 (1987-06-01), Chang
patent: 4863652 (1989-09-01), Chang
patent: 4946536 (1990-08-01), Kumazaki
patent: 5308562 (1994-05-01), Wohlfahrt-Laymann
Modern Plastics International, vol. 7, No. 4, Apr. 1977, Lausanne CH, pp. 57-59, Bishop, "Vented-screw injection molding".

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