Blow molding process for the manufacture of polyethylene terepht

Details Blow molding process for the manufacture of polyethylene terepht Blow molding process for the manufacture of polyethylene terepht

1993-03-19

1994-08-30

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264230, 264235, 264342R, 264346, 264521, 264530, 425526, B29C 4918, B29C 4964, B29C 4968

Patent

active

053425588

ABSTRACT:
Blow molding processes for the manufacture of polyethylene terephthalate (PET) containers are disclosed. The containers are capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. A representative process includes the steps of blow molding the heated body of an amorphous PET preform comprising a body and a neck section having a body with dimensions greater than the dimensions of the final PET container to be formed; heating only the body of the intermediate container under specified conditions to rapidly shrink the body, thus forming a contracted body; heating the neck section to effect crystallization thereof; slowly cooling the neck section alone while heating of the contracted intermediate body continues; and blow molding the heated contracted body of the intermediate container in a second mold to its final shape and dimensions.

REFERENCES:
patent: 4379099 (1983-04-01), Ota et al.
patent: 4385089 (1983-05-01), Bonnebat et al.
patent: 4572811 (1986-02-01), Ota et al.
patent: 4836971 (1987-06-01), Denis et al.

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