Abstract The formation of a composite formed by spreading a liquid thermosetting resin over a continuously moving plastic film or sheet. Chopped fiber is added and a fabric or veil, such as dacron polyester cloth, is continuously laid over the top to form a reinforced composite. This continuously produced thermosetting resin composite is rolled into a coil. After a maturation period, the plastic film or sheet may be removed from the SMC composite and sections of appropriate size and weight are cut from the coil and placed over the die of a compression molding machine, veil side down, up or both. The material is then compression molded at a pressure of 500-3000 p.s.i. (35 to 210 kg. per sq. cm.) and a temperature of 100°-165° C., and cured into an article. The fabric used has a grab break strength of at least 10 lbs. (4.5 kg.) in both longitudinal and transverse directions, and a tensile elongation of at least 10%, and is sufficiently permeable to permit liquid resin to pass therethrough during compression molding.
A reinforced composite suitable for conversion into a finished product by compression molding at temperatures of 100°-165° C. and pressures of 500-3000 p.s.i. (35-210 kg. per sq. cm.) comprising a uniform layer of a dry partially cured curable thermosetting polymeric material capable of being liquified by heat including a reinforcing proportion of reinforcing fibers, and a fabric overlying at least one surface of said layer, said fabric having a grab break strength of at least 10 lbs. (4.5 kg.) in both longitudinal and transverse directions, and a tensile elongation of at least 10%, said fabric being sufficiently permeable to permit liquid polymeric material to pass therethrough during compression molding.
Claim 2
Dependent Claim
109 words
A reinforced composite suitable for conversion into a finished product by compression molding at temperatures of 100°-165° C. and pressures of 500-3000 p.s.i. (35-210 kg. per sq. cm.) comprising a uniform layer of a dry partially cured curable thermosetting polymeric material capable of being liquified by heat including a reinforcing proportion of reinforcing fibers, and a fabric overlying at least one surface of said layer, said fabric having a grab break strength of at least 10 lbs. (4.5 kg.) in both longitudinal and transverse directions, and a tensile elongation of at least 10%, said fabric being sufficiently permeable to permit liquid polymeric material to pass therethrough during compression molding.
Claim 3
Dependent Claim
14 words
The reinforced composite according to claim 1 wherein the fabric comprises linear polyester fibers.
Claim 4
Dependent Claim
16 words
The reinforced composite according to claim 1 wherein the curable polymeric material comprises a polyester resin.
Claim 5
Dependent Claim
15 words
The reinforced composite according to claim 1 wherein the reinforcing fibers comprise chopped glass rovings.
Claim 6
Dependent Claim
19 words
The reinforced composite according to claim 1 wherein the reinforcing fibers comprise continuous fibers axially aligned in said layer.