| 摘要 |
<p>A method for making a non-woven, dimensionally stable composite sheet comprising a polymeric binder, cellulosic fibers, and glass fibers comprising the following steps (A) - (D) in sequence: (A) forming an aqueous dispersion of: (i) cellulosic fibers in the form of a wood pulp consisting essentially of soft wood fibers of a particular type; and (ii) a water-soluble surfactant comprising a dispersion aid for said glass fibers in an amount sufficient to disperse said glass fibers in said dispersion; (B) adding to said dispersion containing said cellulosic fibers and said surfactant chopped glass fibers in an amount such that the partial consistency of said glass fibers in said dispersion is from about 0.5 to about 3.0 %, said added glass fibers having only residual water content, an average length of from about 0.1 to 0.7 inch and a diameter of about 6ν to about 13ν; (C) adding to said dispersion containing said surfactant and said fibers an organic, water-insoluble, film-forming, polymeric binder; and (D) forming from said aqueous dispersion a dried, non-woven dimensionally stable composite sheet comprising from about 5 to about 50 wt.% of said cellulosic fibers and from about 5 to about 25 wt.% of said glass fibers.</p> |
