Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1978-06-01
1980-06-10
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264113, B29H 902
Patent
active
042072824
ABSTRACT:
The formation of a composite formed by spreading a liquid thermosetting resin over a continuously moving plastic film or sheet is disclosed. Chopped fiber is added and a fabric or veil, such as a 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.degree.-165.degree. C., and cured into an article. In another embodiment, the fabric or veil may be first placed on one of the die elements, e.g., the bottom die. SMC is then placed over the fabric to make up the total charge. The charge is then compression molded under the conditions previously described. 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.
REFERENCES:
patent: 3784664 (1974-01-01), Nicklin
Lubin, G., ed. Handbook of Fiberglass and Advanced Plastics Composites, Van Nostrand Reinhold Co., N.Y. 1969, pp. 37-40.
Naitore, M. H., Asso. Ed., Plastics Technology, Mar., 1976, p. 41.
Armco Inc.
Arnold Donald J.
Hall James R.
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