Molding tool construction and molding method

Details Molding tool construction and molding method Molding tool construction and molding method

2005-03-01

2005-03-01

Heitbrink, Jill L. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Treatment of material by vibrating, jarring, or agitating...

C249S111000, C249S116000, C249S134000, C264S219000, C264S327000, C425S407000, C425S548000

Reexamination Certificate

active

06861021

ABSTRACT:
An molding apparatus useful for molding polymer compositions includes a substrate; a first insulating layer having an electrical resistivity of at least about 1010ohm-centimeters and thermal conductivity of about 0.2 to about 5 watts/(meter-kelvin); a heating element; a second insulating layer having an electrical resistivity of at least about 1010ohm-centimeters and a thermal conductivity of at least about 5 watts/(meter-kelvin); and a first molding layer having a specific heat capacity of about 100 to about 2,500 joules/(kilogram-kelvin), and optionally, a second molding layer. The apparatus provides rapid heating and cooling of the mold surface. The apparatus may be employed for rapidly molding articles having desirable surface characteristics.

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