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

1991-02-13

1993-07-20

Silbaugh, Jan H.

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

052290425

ABSTRACT:
A process for the manufacture of a polyethylene terephthalate (PET) container 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. The process inlcudes the following steps, on an amorphous PET preform which includes a body and a neck section which already possesses the final shape and dimensions of the PET container to be formed, heating only the body, exclusive of the neck section, of the PET preform to a temperature at least equal to the PET-softening temperature; in a mold, blow molding the heated preform body to form an intermediate container whose body has dimensions greater, by about 20% with respect to height and by 0 to about 30% transversely, than the dimensions of the PET container to be formed, while cooling the mold walls holding the intermediate container to a temperature of about 5.degree. to about 40.degree. C.; heating the body of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. for a period of about 1 to about 5 minutes to obtain an intermediate container with contracted body, while heating the neck section during part of or the entire body heating time under temperature and time conditions sufficient to allow crystallization of the PET neck section alone; slowly cooling the neck section; and blow molding the heated contracted body of the intermediate container obtained to its final shape and dimensions for a period of about 2 to about 6 seconds.

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 (1989-06-01), Denis et al.

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