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Ground Network Insert for Polymers Containing Conductive Fibers

IP.com Disclosure Number: IPCOM000062771D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Launikitis, JA: AUTHOR

Abstract

A conductive wire mesh screen is integrally formed with the conductive polymer sheets or layers of thermosetting sheet molding compounds and acts as a conductor for grounding unwanted electrical charges in the resulting molded part.

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Ground Network Insert for Polymers Containing Conductive Fibers

A conductive wire mesh screen is integrally formed with the conductive polymer sheets or layers of thermosetting sheet molding compounds and acts as a conductor for grounding unwanted electrical charges in the resulting molded part.

This arrangement provides a direct path for an electrical charge to return to ground in certain conductive polymers, such as those composed of thermosetting sheet molding compound (SMC) resin filled with conductive fibers such as aluminized glass, stainless steel or carbon veils.

Figs. 1 and 2 show an insert design which may be used to enhance the grounding of these conductive polymers. The unique feature is a mechanically attached screen 1, of highly conductive metal, which acts as an integral part of the insert to intermix with the conductive fibers in a plane parallel to that which the fibers align when molded. The conductive insert 3 is attached to the screen 1 by a lock nut 5, although other means of fastening such a crimping or brazing can also be used for mechanical attachment of the two elements. The overall dimensions of the screen should be made as large as possible, within the physical constraints of each housing design, in order to maximize the number of conductive fibers in contact with the insert.

In the molding process, the SMC layers 2 and 4 are driven from the outside surfaces toward the inner veil, forcing the conductive fibers against and through the me...