Method for scoring rigid plastic sheet material

Details Method for scoring rigid plastic sheet material Method for scoring rigid plastic sheet material

1986-08-11

1989-04-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264156, 264313, 264320, 264DIG66, 425291, 425398, B29C 4304, B29C 5902

Patent

active

048184616

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.

REFERENCES:
patent: 2351475 (1944-06-01), Berger
patent: 2416451 (1947-02-01), Magnus
patent: 3502761 (1970-03-01), Dimitracopoulos
patent: 4074414 (1978-02-01), Anderka et al.
patent: 4415515 (1983-11-01), Rosenberg
patent: 4555378 (1985-11-01), Martin et al.

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