Blow-molding methods to form containers having upper and lower sections of different thicknesses
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United States of America Patent
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-
Mar 31, 1992
Issued Date -
N/A
app pub date -
Apr 29, 1989
filing date -
Apr 4, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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Cited Art Landscape
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