D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
154/114, 9/39
D21H 11/04 (2006.01) D21H 11/14 (2006.01) D21H 13/40 (2006.01) D21H 13/46 (2006.01) D21H 17/67 (2006.01) D21H 21/52 (2006.01) E04C 2/04 (2006.01)
Patent
CA 1175611
ABSTRACT OF THE DISCLOSURE A composite paper particularly adapted for use as cover sheets in the production of qypsum wallboard, the paper being sufficiently porous to permit better drainage and more rapid drying in the production of the paper, and when applied to the surfaces of a gypsum slurry for forming wallboard, per- mits less heat to be utilized ln the wallboard conversion, thereby saving energy in the board production required for drying tho board. The paper comprises in weight percent: (A) fibers in an amount of from about 65% to about 90% and having a fiber freeness of from about 350 to 550 ml. Canadian Standard Freeness, (B) a mineral filler in an amount from about 10% to about 35%, (C) a binder in an amount from about 1% to about 3-1/2%, (D) e flocculant in an amount of from about 2 to about lb./ton, and (E) sizing agent in an effective amount to prevent water penetration, In a preferred embodiment the paper is treated with an internal sizing agent during ito formation, and subsequontly treated with a surface sizing agent after formation, in order to provide better adhesion to the gypsum core.
402884
Johnstone Norman E.
Kehoe John R.
Company United States Gypsum
Macrae & Co.
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