Method of making a plastic casing with a conductive film

Details Method of making a plastic casing with a conductive film Method of making a plastic casing with a conductive film

1985-02-28

1986-12-16

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Forming electrical articles by shaping electroconductive...

264105, 428547, 428408, B29D 900

Patent

active

046295950

ABSTRACT:
Disclosed herein is a method of making a plastic casing with a conductive film which is effective to screen electromagnetic waves and prevent electrification. The method comprises the steps of removably coating a conductive material containing coarse conductive powder onto a mold surface of a mold set for forming a plastic casing, drying the coated conductive material to form a solidified film, injecting a fluidized thermoplastic material under high pressure into the mold set, and compressing the solidified film by the high temperature and high pressure of the thermoplastic material, thereby anchoring the solidified film to the contact surface of the molded casing opposite to the solidified film. The conductive film of the plastic casing thus made has a highly aggregate layer in which the particles of conductive powder are densely collected into point-to-point and/or surface-to-surface contact so that the contacting area of the particles is vastly increased.

REFERENCES:
patent: 3846223 (1974-11-01), Lederman et al.
patent: 4081578 (1978-03-01), van Essen et al.
patent: 4442055 (1984-04-01), Oelsch et al.

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