Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work
Patent
1975-06-03
1977-02-08
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
264 36, 264102, 264344, 156 94, B29C 2500
Patent
active
040072452
ABSTRACT:
Method of improving the shear strength properties of degraded fibrous/resin composites comprising subjecting the composite article to a vacuum heat treatment. The vacuum heat treatment of the degraded composite article regenerates the bond at the fibrous/resin interface, causing a regain in shear strength. The treatment comprises subjecting the composite to a pressure of about 1 millimeter of mercury at a temperature of 300.degree. F (149.degree. C) for 24 hours.
REFERENCES:
patent: 3029473 (1962-04-01), Greenberg
patent: 3047909 (1962-08-01), Boyer
"Glass Fibre and Glass to Resin Adhesion," by K. J. Brookfield, Reinforced lastics, (London), vol. 27, No. 299, pp. 135-138, (9/62).
"The Effect of Heat & Water Immersion on the Flexural Strength of Certain Glass Fibre/Polyester Resin Laminates," by H. J. Brookfield, Applied Plastics, Apr. 1959, pp. 29-31 and May 1959, pp. 41-44.
Edelberg Nathan
Gibson Robert P.
Lowe James B.
The United States of America as represented by the Secretary of
Voigt Jack W.
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