Method of producing plastic containers for storage of goods unde

Details Method of producing plastic containers for storage of goods unde Method of producing plastic containers for storage of goods unde

1979-03-20

1981-04-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264537, 264540, 264235, 264346, 425526, B29C 1707, B29C 2500

Patent

active

042645581

ABSTRACT:
A method of producing a form retaining container made of synthetic plastic material comprising feeding a plastic material in liquid state onto a male member to provide a layer on the male member constituting a blank for the container. The layer is cooled to prevent crystallization of the material. The thus cooled blank is placed into a mold cavity having an interior configuration corresponding to the desired outer shape of the container to be produced. The layer is inflated into conformity with the mold cavity. The configuration of the mold cavity is such that the blank undergoes biaxial stretching in a middle region of the container by at least 1.5 times while the mouth and part of the bottom of the container will be formed by biaxially stretching the blank less than 1.5 times. The inflated blank is then heated until curing is completed and then the blank is removed from the mold.

REFERENCES:
patent: 3496143 (1970-02-01), Siggel et al.
patent: 3803275 (1974-04-01), Corsover
patent: 3821349 (1974-06-01), Mozer
patent: 3822332 (1974-07-01), Hrach et al.
patent: 3849530 (1974-11-01), Wyeth et al.
patent: 3966378 (1976-06-01), Valyi
patent: 3970419 (1976-07-01), Valyi

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