Injection molding footwear

Details Injection molding footwear Injection molding footwear

1977-02-09

1979-01-16

Hoag, W.E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264259, 264328, B29C 500, B29D 900, B29F 110

Patent

active

041349555

ABSTRACT:
Method of making casual footwear including a knitted fabric upper, a woven insole portion, and an injection-molded sole is produced in a mold cycle of 45-second duration, as opposed to five or six minutes heretofore generally required, or the +2 minutes with the latest known materials. Molding conditions and materials are carefully controlled, and substantial penetration of the woven and knitted fabrics by the injected material is achieved. The woven insole portion prevents the flowing plastic from pushing the upper over the last. Ethylene/ethyl acrylate copolymer, polyvinyl chloride and styrene butadiene are preferred sole thermoplastics.

REFERENCES:
patent: 1955720 (1934-04-01), Rollman
patent: 2147197 (1939-02-01), Glidden
patent: 3031723 (1962-05-01), Baudou
patent: 3035291 (1962-05-01), Bingham
patent: 3324220 (1967-06-01), Goy
patent: 3383782 (1968-05-01), McGinnity
patent: 3416174 (1968-12-01), Novitske
patent: 3611501 (1971-10-01), Daum et al.
patent: 3676542 (1972-07-01), Maltby
patent: 3863272 (1975-02-01), Guille

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