| 摘要 |
A composite paper particularly adapted for use as cover sheets in the production of gypsum 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, permits less heat to be utilized in the wallboard conversion, thereby saving energy in the board production required for drying the 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 31/2%, (D) a flocculant in an amount of from about 2 to about 4 lb. |
