Method for forming an invisible tear seam

Details Method for forming an invisible tear seam Method for forming an invisible tear seam

1992-11-12

1993-10-26

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With reshaping or surface embossing of formed article

264126, 264302, 264DIG60, 280732, B29C 3902

Patent

active

052563545

ABSTRACT:
A method for forming a hidden tear seam in the cover for a safety air bag assembly comprises the steps of filling a heated open mold with liquid plastisol or dry powder comprised of polyvinyl materials; forming a gel layer of polyvinyl chloride material on the open heated thin metal mold; dumping excess polyvinyl liquid plastisol chloride material from the gel layer; fusing the gel layer; stamping a tear seam in a fused layer while it is still plastic by providing an anvil having a surface thereon of a first predetermined area and including an embossment thereon extending outwardly of said first predetermined area and stamping the tear seam by directing the embossment into the fused layer until the surface engages the fused layer and wherein the first predetermined area is sized to produce a reaction force on the anvil to determine the depth of penetration of the embossment and thereafter finally curing and cooling the fused layer and removing same from said thin metal mold.

REFERENCES:
patent: 4217325 (1980-08-01), Colby
patent: 4246213 (1981-01-01), Takamatsu et al.
patent: 4562025 (1985-12-01), Gray
patent: 4665864 (1987-05-01), Wersosky
patent: 4755333 (1988-07-01), Gray
patent: 4895389 (1990-01-01), Pack, Jr.
patent: 4923657 (1990-05-01), Gembinski et al.
patent: 4979888 (1990-12-01), Bauer et al.
patent: 5082310 (1992-01-01), Bauer

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