Radiation stress relieving of polymer articles

Details Radiation stress relieving of polymer articles Radiation stress relieving of polymer articles

C - Chemistry, Metallurgy

08

J

204/91.79

C08J 3/28 (2006.01)

Patent

CA 1218955

UNITED STATES PATENT APPLICATION Of: David C. Frisch and Wilhelm Weber For: RADIATION STRESS RELIEVING OF POLYMER ARTICLES ABSTRACT OF THE DISCLOSURE A method of rapidly relieving stress in an extruded or molded polymer article is disclosed. The method can be used in the preparation of printed circuit boards. An article comprised of the polymer is exposed to electromagnetic radiation, for a time period sufficient to absorb enough energy to stress relieve the polymer against stress cracking therein. Exposure occurs at one or more ranges of frequencies which are capable of being absorbed by the polymer and which are effective or stress relieving without or substantially without causing heat induced softening or flowing of the polymer. The electromagnetic radiation is selected from the ranges of infrared, microwave or ultraviolet radiation. S P E C I F I C A T I O N

407053

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