Apparatus for scoring rigid plastic sheet material

Details Apparatus for scoring rigid plastic sheet material Apparatus for scoring rigid plastic sheet material

1988-08-18

1989-10-31

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

220 904, 220270, 264156, 425291, 425398, B29C 4340

Patent

active

048773913

ABSTRACT:
An apparatus for forming frangible score lines in rigid plastic sheet material. The apparatus utilizes a flat surface having a serrated edge having points and notches. The rigid plastic sheet material is laid on the flat surface. A scoring means is positioned to strike downwardly on the sheet material whereby the points of the serrated edge of the flat surface will extend into the sheet material a distance further than the notches of the serrated edge to thus form a corrugated fracturable score line in the plastic sheet material. The apparatus is useful for forming score lines in lids for drink cups intended for fast food service.

REFERENCES:
patent: 2351475 (1944-06-01), Berger
patent: 2416451 (1947-02-01), Magnus
patent: 3502761 (1970-03-01), Dimitracopoulos
patent: 3572579 (1971-03-01), Mueller et al.
patent: 4074414 (1978-02-01), Anderka et al.
patent: 4302415 (1981-11-01), Lake
patent: 4409178 (1983-10-01), Ward
patent: 4415515 (1983-11-01), Rosenberg
patent: 4518096 (1985-05-01), Winstead
patent: 4555378 (1985-11-01), Martin et al.

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