Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – With subsequent cutting – grooving – breaking – or comminuting
Patent
1979-11-19
1981-06-23
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
With subsequent cutting, grooving, breaking, or comminuting
264119, 264120, B29J 500
Patent
active
042750270
ABSTRACT:
A cellulosic fiber containing board is molded 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 consolidated blank. The consolidated 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 is formed by hot-pressing a consolidated cellulosic fiber-containing board including urea in at least its surface fibers, at a temperature of at least 525.degree. F. The composition of the skin has not been determined but is different than the composition of cellulosic material thereunder. In one embodiment, the consolidated cellulosic fiber-containing board has a density of less than 35 pounds/ft..sup.3 to provide a skin of higher density and substantially better structural properties. In accordance with another embodiment, a consolidated board having a density of at least 35 pounds/ft..sup.3 is provided with a skin which is not as significantly different from the core material as is the skin formed over the low density core material of the first embodiment, but the skin on the higher density mats also improves the board strength, stiffness, paint holdout and design fidelity properties.
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Clarke John T.
Hoffman Michael R.
Luck Allan J.
Czaja Donald E.
Hall James R.
Masonite Corporation
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