Plastic closure with score lines

Details Plastic closure with score lines Plastic closure with score lines

1988-08-18

1989-05-09

Hall, George T.

Receptacles

Closures

With closure opening arrangements for means

2299061, B65D 4148

Patent

active

048281379

ABSTRACT:
According to this invention, there is provided a method and apparatus for making an article, such as a lid for a plastic food container made of plastic 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 said sheet material and being rupturable for the removal of said 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 said 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.

REFERENCES:
patent: 3800999 (1974-04-01), Serritella
patent: 4081103 (1978-03-01), Zoellick
patent: 4502608 (1985-03-01), Mills
patent: 4747509 (1988-05-01), Florkiewicz et al.

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