Method and apparatus for scoring rigid plastic sheet...

B - Operations – Transporting – 26 – D

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B26D 3/08 (2006.01) B29C 53/06 (2006.01) B29C 59/00 (2006.01) B29C 59/02 (2006.01) B65D 17/34 (2006.01) B65D 47/10 (2006.01) B29C 37/00 (2006.01)

Patent

CA 1296675

ABSTRACT According to this invention, there is provided a method and apparatus for making an article, such 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 said 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.

543944

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