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Browse Prior Art Database

Forming a Composite Molded Part

IP.com Disclosure Number: IPCOM000082579D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Brown, AB: AUTHOR [+2]

Abstract

This device provides means for injection molding a plastic part having a preformed plastic skin. It provides a combined vacuum forming and injection molding action. Selection of color, texture and other conditions in the preform film allows the preparation of an injection molded plastic part having predetermined surface characteristics, without any secondary surface finishing operations.

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Forming a Composite Molded Part

This device provides means for injection molding a plastic part having a preformed plastic skin. It provides a combined vacuum forming and injection molding action. Selection of color, texture and other conditions in the preform film allows the preparation of an injection molded plastic part having predetermined surface characteristics, without any secondary surface finishing operations.

The device may be, for example, any standard injection molding apparatus, with slight modifications as shown. A thin thermoplastic film 2 of the desired character is supported in frame 4. Frame 4 is placed between fixed mold half 6 and movable mold half 8 carried by, for example, a modified injection molding device. The injection molding device and mold half 8 have been modified so that vacuum ports 10 are operatively located within mold half 8. This allows a vacuum to be drawn into mold cavity 8.

In operation, frame 4 and film 2 which it carries are brought into contact with mold half 8 and a vacuum is drawn in the mold through vacuum ports 10. This causes film 2 to be drawn into intimate contact with the cavity walls of mold 8. The vacuum may be drawn while mold halves 6 and 8 are separated, or after the two mold halves are brought together. Prior to vacuum drawing, it is desirable to heat film 2 or to take whatever other steps are necessary to condition the film for forming.

Where the vacuum is drawn after the mold halves are brought together, t...