Urea containing high density skin fiberboard with a low density

Details Urea containing high density skin fiberboard with a low density Urea containing high density skin fiberboard with a low density

1976-11-05

1979-11-20

Ives, P. C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428218, 428236, 428301, 428526, 156 628, 156285, 156331, 162101, 264128, 264113, B32B 514, B32B 702, B29J 504

Patent

active

041751507

ABSTRACT:
A fiberboard is manufactured having relatively high density skins on a relatively low density core by including urea in at least the surface fibers of a consolidated mat, having a density of less than 35 pounds per cubic foot, and then hot-pressing the consolidated mat at a temperature of at least 525.degree. F. to form a board having high density surface skins.

REFERENCES:
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patent: 3673021 (1972-06-01), Joa
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patent: 3762974 (1973-10-01), Wirz
patent: 3927235 (1975-12-01), Chow
patent: 3959005 (1976-05-01), Bruun et al.
patent: 4007076 (1977-02-01), Clarke et al.
patent: 4012561 (1977-03-01), Doughty

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