Neutral sized paper for use in the production of gypsum...

Details Neutral sized paper for use in the production of gypsum... Neutral sized paper for use in the production of gypsum...

B - Operations, Transporting

32

B

154/114, 154/69

B32B 13/08 (2006.01) D21H 17/15 (2006.01) E04C 2/04 (2006.01)

Patent

CA 1212506

APPLICATION FOR LETTERS PATENT FOR NEUTRAL SIZED PAPER FOR USE IN THE PRODUCTION OF GYPSUM WALLBOARD ABSTRACT OF THE DISCLOSURE A paper particularly adapted for use as cover sheets in the production of gypsum wallboard, the paper having improved porosity and strength to permit better drainage and more rapid drying in the production of the paper to permit less fiber to be utilized, and to permit less heat to be utilized in drying the paper, providing for production of superior gypsum board. The paper comprises in weight percent: (A) fibers having a fiber freeness of from about 350 to 550 ml. Canadian Standard Freeness, (B) a buffering agent in an amount from about .25 to about 10%, (C) a neutral sizing agent in an effective amount to prevent water penetration, and (D) a cationic starch. In a preferred embodiment the paper is treated with a neutral internal sizing agent during its formation, and subsequently treated with a surface sizing agent after formation of the paper, in order to provide certain proper- ties including better adhesion to the gypsum core.

438810

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