Molding method for manufacture of a resin molded part

Details Molding method for manufacture of a resin molded part Molding method for manufacture of a resin molded part

1990-01-17

1991-04-30

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428332, 428192, 2003022, 200333, 379451, 455128, B32B 300, H01H 1306

Patent

active

050117289

ABSTRACT:
A molding method for manufacture of a resin molded part having one or more flexibly movable, pushbutton-shaped thick projections formed integrally with a base through the intermediary of thin wall portions continued from the peripheral edges of the projections, wherein a thermoplastic elastomer is used as a molding material, and wherein the thick projections, the thin wall portions, and the base are integrally molded by supplying a mass of the molding material into a mold through a gate provided adjacent the center of a portion corresponding to each of the projections. The method requires no vulcanization and permits efficient production. Furthermore, it allows well balanced flow of the molding material and eliminates the possibility of burrs and sink marks being produced.

REFERENCES:
patent: 2415961 (1947-02-01), Nast
patent: 3669598 (1972-06-01), Tucker
patent: 3995008 (1976-11-01), Spiegelberg
patent: 4264295 (1981-04-01), Hingley
patent: 4501936 (1985-02-01), Morse

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