Patent Number: 6,251,224

Title: Bicomponent mats of glass fibers and pulp fibers and their method of manufacture

Abstract: The invention relates to a method of forming a bicomponent mat, the bicomponent mat which is formed from glass fibers and pulp fibers and methods of making a bicomponent mat. Initially in the method of forming a bicomponent mat, a pulp surface is treated with a cationic polymer in a pulp slurry. The next step involves using a surfactant to disperse glass fibers in a polyacrylamide (PAM)-based white water. The pulp slurry and the slurry of glass fibers are generally compatible and are combined to form a bicomponent furnish. The method has several advantages over conventional methods. First, conventional wet chop products typically cannot be used to form a bicomponent mat in a typical surfactant/PAM-based white water. Second, while some other fibers (such as glass fibers) may be used in the production of bicomponent mats in a typical PAM-based white water, the mat forming process is frequently interrupted and tends to produce very poor quality mats. Third, the mat forming of the invention process easily produces high quality bicomponent mats that are uniform and have a dense structure and low permeability. Finally, the method of the invention may be used to make a variety of wet chop products that are compatible with either softwood or hardwood fibers.

Inventors: Dong; Daojie (Westerville, OH)

Assignee: Owens Corning Fiberglass Technology, Inc.

International Classification: D21H 13/00 (20060101); D21H 13/40 (20060101); D21H 013/40 ()

Expiration Date: 06/26/2018