Method of forming sealing gaskets in container closures

Details Method of forming sealing gaskets in container closures Method of forming sealing gaskets in container closures

1980-06-04

1981-12-08

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264268, 4251748R, 425809, B29C 1302

Patent

active

043047440

ABSTRACT:
Method of forming a sealing gasket made from vinyl chloride resin plastisol in container closures made of a high-melting olefin polymer, especially polypropylene. The invention employs a combination of microwave heating and controlled heating by conventional means. The controlled conventional heating raises the temperature of the closure to from 5.degree. to 35.degree. C., preferably 5.degree. to 15.degree. C., below its melting point; at this temperature microwave heating is then introduced to flux the plastisol.

REFERENCES:
patent: 2835926 (1958-05-01), Maier et al.
patent: 2881475 (1959-04-01), Wilckens
"Plastics-Microwaves Pros & Cons", C. H. Will, SPE Journal, Nov. 1968, vol. 24, pp. 29-32.

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