Method for scoring rigid plastic sheet material
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United States of America Patent
Stats
-
Apr 4, 1989
Issued Date -
N/A
app pub date -
Aug 11, 1986
filing date -
Sep 9, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for making an article, such as a plastic food container lid having frangible score lines. The article is formed of a sheet of plastic material having substantially constant thickness with score lines defining an offset portion thereof which is connected to the remaining sheet material by a segment that is thinner than the sheet material and being rupturable for the removal of the offset portion. The periphery of the inwardly directed portion of the offset portion overlaps the periphery of the outwardly directed portion of the offset portion on the opposite side of the sheet material. The fracturable score lines are corrugated along their length by a plurality of successive grooves and ridges with the grooves extending deeper into the material than the ridges.
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Cited Art Landscape
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