Injection molded articles with improved surface characteristics

Details Injection molded articles with improved surface characteristics Injection molded articles with improved surface characteristics

1982-03-29

1984-03-27

McCamish, Marion

Stock material or miscellaneous articles

Surface property or characteristic of web, sheet or block

4285428, 4289122, 264 25, B32B 900, B32B 904

Patent

active

044394926

ABSTRACT:
In injection molding thermoplastic resin compositions containing reinforcing materials and/or fillers, high quality molded articles superior in surface gloss and exhibiting substantially no surface defect can be obtained, by employing a technical measure, in which only superficial layer of the inner wall surface of the mold is selectively heated, by high-frequency induction heating, to a temperature above the heat distortion temperature of the thermoplastic resin composition employed prior to injection molding and cooling and solidifying the resin.

REFERENCES:
patent: 2686935 (1954-08-01), Stott
patent: 2696023 (1954-12-01), Stott
patent: 2781547 (1957-02-01), Moxness
patent: 3988403 (1976-10-01), Angell et al.
patent: 4029841 (1977-06-01), Schmidt
patent: 4064206 (1977-12-01), Seufert
patent: 4083901 (1978-04-01), Schonfeld et al.
patent: 4123488 (1978-10-01), Lawson
patent: 4198457 (1980-04-01), Saito et al.
patent: 4201742 (1980-05-01), Hendry

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