Injection of molding material into molds that may contain cores

Details Injection of molding material into molds that may contain cores Injection of molding material into molds that may contain cores

1992-07-27

1993-09-28

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264257, B29C 4526

Patent

active

052484670

ABSTRACT:
An injection molding method and apparatus is disclosed that enables the injection of molding material into molds that may contain fibers, long, oriented fibers, core inserts and/or surface inserts. The method utilizes these steps: first, evacuation of the mold and its contents with the use of a vacuum means to remove gasses, adsorbed and chemisorbed water and other substances, second, injection of material into the mold using an injection pump or atmospheric pressure to force molding material into the mold. Apparatus for the preferred embodiment includes the placement of molds and any mold contents in a vacuum chamber to eliminate a dependence on seals around the mold, and means for injection of molding material under vacuum.

REFERENCES:
patent: 4132755 (1979-01-01), Johnson
patent: 4248817 (1981-02-01), Frank
patent: 4256444 (1981-03-01), Suter
patent: 4412804 (1983-11-01), Huther
patent: 4439386 (1984-03-01), Antczak
patent: 4927580 (1990-05-01), Nasu et al.
patent: 4997606 (1991-03-01), Mears et al.
patent: 5059370 (1991-10-01), Kojima
patent: 5082615 (1992-01-01), Sakai
Robinson, Norman W., The Physical Principles of Ultra-high Vacuum Systems and Equipment, 1968, pp. 150-213.

Affiliated with

Also associated with

Rating

Injection of molding material into molds that may contain cores does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Injection of molding material into molds that may contain cores , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injection of molding material into molds that may contain cores will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2189399