Fiber polymer trim
AssigneeCertainteed Gypsum and Ceiling Manufacturing, Inc
InventorDouglas J. Wambaugh
Life of this patent
Estimating the term…
Abstract
A corner trim material that is made of a material that will bond with current industry mastics such as all purpose joint compounds, resists impact, resists abrasion, and readily accepts common coatings such as drywall mud, texture and paints. The surface of this material generally does not need to be covered by any secondary fiber based material such as paper to improve bonding or coating on the inside or outside. The material generally consists of a polymer mixed with a fibrous material like pulp or glass fiber. A corner trim piece can be directly extruded from the mix. The corner trim piece can have a center hinge, can be bullnose, and the flanges can optionally have holes or optionally be coated with adhesive.
Claims17
A drywall corner trim piece, comprising:
- a substantially uniform profile having a radiused bullnosed center section and a tapered flange extending from an end of the radiused bullnosed center section in a substantially continuous taper on each side of the drywall corner trim piece to thinner outside edges of the tapered flange;
- wherein the drywall corner trim piece is formed from an extruded composite material comprising at least one polymer and at least one fibrous material.
A method of forming a drywall corner trim piece, comprising:
- mixing a base polymer and a fibrous material at a temperature sufficient to melt the base polymer and the fibrous material into a contiguous composite material mix;
- and
- extruding a corner trim piece from the contiguous composite material mix, wherein the corner trim piece comprises substantially co-planar flanges extending from an end of a radiused bullnosed center section in a substantially continuous taper in a substantially flat configuration, wherein the corner trim piece comprises tapered flanges extending from a thicker section at the centerline in a substantially continuous taper on each side of the drywall corner trim piece to thinner sections at distal edges of the tapered flanges.
Dependencies are inferred from the claim text.