Process for producing receptacles from a thermoplastic resin foa

Details Process for producing receptacles from a thermoplastic resin foa Process for producing receptacles from a thermoplastic resin foa

1976-07-08

1978-09-12

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Utilizing heat releasable stress to reshape solid workpiece

264248, 264321, B29C 1300

Patent

active

041138244

ABSTRACT:
Die for producing receptacles substantially impervious to liquid by bonding a bottom plate to an apertured receptacle made from a uni-directionally shrinkable thermoplastic resin foam sheet into an apertured receptacle having a flat annular portion provided in continuous with the lower end thereof comprises a female mold and a male mold defining when they are clamped together clearnaces therebetween whose thickness is less than that of the peripheral side wall of the apertured receptacle at the portion corresponding to the peripheral side wall and less than those of the annular portion of the apertured receptacle and the bottom plate at the portion corresponding to the bottom of the resulting receptacle, and at least one annular ridge having a height 50 - 90 % of the thickness of the clearance at the bottom and being integrally provided either on the inner surface of the female mold or the outer surface of the male mold at the portions against which the annular portion of the apertured receptacle is abutted.

REFERENCES:
patent: 2526311 (1960-10-01), Wilson
patent: 2989785 (1961-06-01), Stahl
patent: 3344222 (1967-09-01), Shapiro et al.
patent: 3370117 (1968-02-01), Blue
patent: 3673033 (1972-06-01), MacDaniel et al.
patent: 3792137 (1974-02-01), Seto
patent: 3919368 (1975-11-01), Seto
patent: 3967991 (1976-07-01), Shimano et al.
patent: 3970492 (1976-07-01), Anberg

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