Blow-molding methods to form containers having upper and lower s

Details Blow-molding methods to form containers having upper and lower s Blow-molding methods to form containers having upper and lower s

1989-04-29

1992-03-31

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

264154, 264167, 264536, 264541, 264DIG33, B29C 4904

Patent

active

051006073

ABSTRACT:
A plastic container having base and sidewall portions is provided with corrugations as a unitary part of the sidewall portion. The sidewall portion is of a thickness that would not be capable of supporting itself without the unitary corrugations. The corrugations serve to rigidify, and this impart self-supporting capabilities to, the sidewall portion. The upper edge of the sidewall preferably includes a unitarily formed rim which assists in maintaining the sidewall in its generally tubular condition (and thus more easily facilitates the placement of articles in the container). The container may be closed by a flexible and gatherable terminal portion which is an integral extension of the rim or the upper edge of the sidewall. The containers of the invention are formed by an extrusion blow-molding technique using an appropriately configured blow mold.

REFERENCES:
patent: 1555115 (1925-09-01), Hand
patent: 2036687 (1936-04-01), Fisher
patent: 2304676 (1942-12-01), Bratring
patent: 2672904 (1954-03-01), Hasselquist
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patent: 3608268 (1971-09-01), Lauritzen
patent: 3795719 (1974-03-01), Morecroft et al.
patent: 4836970 (1989-06-01), Robbins, III
Reid and Cochrane, Big Blow Molding, British Plastics, pp. 220-226, 5/1962.

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