Method for press molding thermoplastic resins

Details Method for press molding thermoplastic resins Method for press molding thermoplastic resins

1990-10-09

1991-07-23

Silbaugh, Jan H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156245, 264154, 264163, 264257, 264266, 264273, 425112, B29C 4318, B29C 6518

Patent

active

050340760

ABSTRACT:
A multi-layer molded article including a thermoplastic resin body having a plurality of ribs and/or bosses on one side and a layer of a foam which is laminated on the side of the thermoplastic resin body having ribs and/or bosses is produced by a press molding method. The method involves the steps of supplying a foam between upper and lower halves of a mold, one of which has plurality of slits and/or holes corresponding to the ribs and/or bosses to be formed, supplying a quantity of a plasticized thermoplastic resin melt between the already supplied foam and the half of the mold not having any slit or hole, moving at least one half of the mold during supplying the thermoplastic resin or just after completion of supply of the thermoplastic resin to press mold the thermoplastic resin so that the plasticized thermoplastic resin breaks at least a part of areas of the foam on the slits and/or holes of the half of the mold to flow into the slits and/or holes and to form the ribs and/or bosses.

REFERENCES:
patent: 2291545 (1942-07-01), Ganz et al.
patent: 3184527 (1965-05-01), Fischer
patent: 3807146 (1974-04-01), Witkowski
patent: 4310376 (1982-01-01), Ebina et al.
patent: 4527709 (1985-07-01), Kondo et al.

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