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ELECTROMAGNETIC SHIELDING UTILIZING CONDUCTIVE THERMO-PLASTIC STRUCTURAL FOAM

IP.com Disclosure Number: IPCOM000024997D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

In constructing office equipment, it is frequently highly desirable to utilize plastics. However, inasmuch as plastic materials are non-conductive, they are inherently transparent to electromagnetic energy and are, therefore, poor shielding materials. Metals, which are highly conductive, are excellent shielding materials. To overcome the disadvantage of plastics in a shielding environment, a shield must be introduced into the plastic. Current technology provides this shield by applying metallic conductive layers onto the plastic surface. Typical methods for shielding include conductive paints, flame metal spray and plating. Thus, all of these processes require secondary operations.

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IEROX DISCLOSURE JOURNAL

ELECTROMAGNETIC SHIELDING

PLASTIC STRUCTURAL FOAM
A. M. Litman
N. E. Fowler

Proposed UTILIZING CONDUCTIVE THERMO- Classification

U.S. c1. 355/3 Int. CI. G03g 15/00

In constructing office equipment, it is frequently highly desirable to utilize plastics. However, inasmuch as plastic materials are non-conductive, they are inherently transparent to electromagnetic energy and are, therefore, poor shielding materials. Metals, which are highly conductive, are excellent shielding materials. To overcome the disadvantage of plastics in a shielding environment, a shield must be introduced into the plastic. Current technology provides this shield by applying metallic conductive layers onto the plastic surface. Typical methods for shielding include conductive paints, flame metal spray and plating. Thus, all of these processes require secondary operations.

In order to eliminate the secondary operation, a conductive plastic material may be employed. However, it has been extremely difficult to utilize conductive thermo- plastic structural foams for shielding. This has been accomplished by the incorporation of electrically conductive particles into the plastic. This produces a conductive plastic throughout which exhibits sufficient conductivity to effectively shield electromagnetic energy.

Volume 8 Number 2 March/April 1983

I 115

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  XEROX DISCLOSURE JOURNAL Volume 8 Number 2 March/April 1983...