Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1977-07-28
1979-11-20
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264118, 264119, 264120, 264128, 264134, B29J 504
Patent
active
041751051
ABSTRACT:
A method of molding a cellulosic fiber containing board at a temperature of at least 525.degree. F. to provide a relatively high density skin on at least one surface. A fibrous composition, including cellulosic fibers, is consolidated to form a blank having a density of less than 35 pounds/cubic foot. The blank is then cut to a shape larger in at least two of its three dimensions than corresponding dimensions of a mold cavity when said mold is in a closed position. Urea is then included in at least a surface layer of fibers of the blank in an amount of at least 5% based on the dry weight of the fibers contacted with urea, and thereafter the cut blank is molded to form a contoured product having a skin on at least one surface thereof, the skin defined by a thickness of material on said surface of said product having a density greater than the material on which the skin is formed.
REFERENCES:
patent: 1953832 (1934-04-01), Waldemar
patent: 3562376 (1971-02-01), Hameister et al.
patent: 3758357 (1973-09-01), Akerson et al.
patent: 4007076 (1977-02-01), Clarke et al.
Clarke John T.
Hoffman Michael R.
Luck Allan J.
Hall James R.
Masonite Corporation
White Robert F.
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