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Title: Method of making a reinforced foam-filled resin-impregnated fiber glass covered vacuum forming mold plug
Abstract:
Method of making a mold for vacuum thermoforming is made by (a) applying a polyester gel coat to a master pattern; (b) applying a rigidizing mixture of a thermosetting resin and glass to the gel coat; (c) constructing and bonding an egg crate framework to the cured thermoset resin and glass fiber mixture; (d) filling the spacings of the egg crate framework with a polymeric rigidizing foam; (e) forming a vacuum plenum on the foam-filled egg crate; (f) attaching to the vacuum plenum a means for introducing a vacuum and; (g) forming air passageways through the gel coat which communicate with the vacuum plenum.
Other info: Inventors: Lint, Robert E. (Medford, NJ, US) Application Number: 544525 Filing Date: 1975-01-27 Publication_date: 1978-02-14 Assignee: Rohm and Haas Company (Philadelphia, PA) Primary Class(es): 29/458 114/357, 156/79, 156/245, 156/253, 264/46.5, 264/46.6, 264/156, 264/219, 264/255, 264/257, 264/261, 264/263, 264/294, 264/309 Other Classes: US Patent Ref:
Other Refs: Other References: Anon., "Spray-Up", Modern Plastics, Sep. 1961, pp. 89-92. Arkhangelskii et al., Fiberglass Boat Building, U.S. Dept. Commerce, Washington, D.C., (1964), pp. 81, 82, 94, 95, 100, 101. | |