Forming an integral closure for a thermoplastic container
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United States of America Patent
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-
Oct 20, 1981
Issued Date -
N/A
app pub date -
May 14, 1980
filing date -
Dec 15, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved high speed cast process for fusing fasteners, with strips of film at their base, to separately extruded film or sheet stock for making containers with integral closure means. The process makes available multiple sets of male and female fastener elements, with variable spacing, in a single extrusion operation. The apparatus is configured so that adhesion between the fastener elements and the film or sheet occurs very closely to the die lips before significant cooling of the extrudate occurs. Containers with improved profiles are obtained because the base permits the profiles to remain relatively rigid during closing and opening.
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