Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Coating or impregnating workpiece before molding or shaping...
Patent
1983-09-30
1984-12-04
Lesmes, George F.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Coating or impregnating workpiece before molding or shaping...
156242, 156245, 156246, 264156, 264258, 264316, B29G 500
Patent
active
044863721
ABSTRACT:
A method of forming perforations in composite laminates by impregnating the material with a modified epoxy resin by means of hot melt or solvent methods. The resin is then allowed to dry. The epoxy impregnated material is then warmed to around 165.degree. F. and forced by a resilient pressure pad over a tool having a plurality of upstanding studs or pins. While in position on the pin tool, the laminate is then partially cured by combined heat and pressure to minimize resin flow while retaining the ability to be formed to a final contour in a contoured curing fixture after removal from the pin tool. Controlled partial cure and selected low flow resin systems prevent resin flow into the formed apertures formed by the pin tool during final resin cure.
REFERENCES:
patent: 2289177 (1942-07-01), Chandler
patent: 3177970 (1965-04-01), Boschi
patent: 3787546 (1974-01-01), Pratt et al.
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patent: 4211590 (1980-07-01), Steward et al.
patent: 4292105 (1981-09-01), Taylor
Brown William D.
Millard Ernest C.
Gilliam Frank D.
Lesmes George F.
Rohr Industries, Inc.
Schlesinger Patrick J.
Schwartz P. R.
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