Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1996-04-19
1997-09-30
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
249 54, 2643281, 264338, B29C 3310, B29C 3356, B29C 4534
Patent
active
056723059
ABSTRACT:
A method of manufacturing a medical prosthetic article by injecting a thermoplastic resin into the cavity of a plaster mold, comprising the steps of: confining first and second plaster molds having porous structures respectively in first and second mold bodies made dividable from each other, the first and second plaster molds defining therein a cavity having first and second inner faces, a contour of a medical prosthetic article to be molded, a sprue runner communicating with the cavity, and an air vent communicating with the cavity; sealing up the cavity not only from the ambient air but also from the porous structures of the first and second plaster molds, when the first and second mold bodies are closed; evacuating the cavity through the air vent; and injecting a thermoplastic resin through the sprue runner into the cavity under a predetermined degree of vacuum.
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