Rupture lines in flexible packages
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United States of America Patent
Stats
-
Oct 7, 1980
Issued Date -
N/A
app pub date -
Nov 1, 1976
filing date -
Nov 1, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus for producing rupturable areas in thermoplastic film wherein said film is used to make closed flexible containers or packages that are easily ruptured for the release of contents contained therein. The apparatus is comprised of a male mold portion and a female mold portion having the film interposed therebetween. Application of heat and pressure to the film by the male and female mold portions cause the plastic film to extrude outwardly from the impression area thereby forming a weakened line or area in the film by selectively reducing the thickness thereof. The film is then formed into flexible packages having the rupture area in a selected position.
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Cited Art Landscape
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