Mineral wool product containing high density skins and method of

Details Mineral wool product containing high density skins and method of Mineral wool product containing high density skins and method of

1978-02-27

1979-11-20

Ives, P. C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428218, 428236, 428301, 428451, 428452, 428526, 428531, 156 622, 156 628, 156331, 156285, B32B 514, B29J 504

Patent

active

041751493

ABSTRACT:
A mineral wool board is manufactured having relatively high density skins by including urea in at least the surface fibers of a consolidated mineral wool fiberboard containing cellulosic fibers and/or starch and then hot-pressing the consolidated board at a temperature of at least 525.degree. F. to form a board having high density surface skins.

REFERENCES:
patent: 1663503 (1928-03-01), Mason
patent: 1663504 (1928-03-01), Mason
patent: 1663506 (1928-03-01), Mason
patent: 1812969 (1931-07-01), Mason
patent: 1812970 (1931-07-01), Mason
patent: 3062699 (1962-11-01), Raphael et al.
patent: 3699203 (1972-10-01), Oshima et al.
patent: 4007076 (1972-02-01), Clarke et al.

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