Arch Drywall Trim Product

Abstract

A notched drywall trim piece that can take the form of a bead, hinged trim piece or bullnose piece that generally is constructed from a semi-rigid core that forms two flanges. At least one of the flanges is notched allowing the piece to follow the shape of an arch or arbitrarily curved corner. The product can generally be installed without any mechanical fasteners since the inner or wall-facing surface of the product is prepared or treated to bond directly with drywall mud or other mastic. In this manner, the piece can be installed using only wet mud or other mastic. The installation process can be aided by the used of a corner roller common in the industry to help set and align the material with the corner being trimmed. The outer or room-facing surface can optionally be treated or prepared to bond with the mud or can be prepared to directly receive paint or texture. The preparation of the flange surface can take the form of a paper or other fibrous layer, scoring, frocking (bonding a powered fibrous material), roughing, protrusions, or a water-activated adhesive or pressure sensitive (or any other) adhesive may be used.

1 . An arch drywall corner trim product comprising:
 an elongated plastic semi-rigid core with a centerline and two plastic flanges separated by a flexible hinge, each flange with a room-facing surface and a wall-facing surface, said flexible hinge allowing the product to be bent repeatedly to any angle about said hinge;   wherein, at least one of said flanges has a plurality of notches running along said flange allowing the product to be bent along the centerline to match a corner curvature; and   wherein the wall-facing surface of at least one flange is prepared to bond with drywall mastic such that no mechanical attachments are necessary;   and wherein in the wall-facing surface of at least one of said flanges is bonded to a layer of fibrous material, and wherein said layer of fibrous material is coated with a layer of water-activated adhesive.   
     
     
         2 . The arch drywall corner trim product of  claim 1  wherein said product is bullnose. 
     
     
         3 . The arch drywall corner trim product of  claim 1  wherein the wall-facing surface of at least one of said flanges is prepared by roughening. 
     
     
         4 . The arch drywall corner trim product of  claim 1  wherein the wall-facing surface of at least one of said flanges is prepared by scoring or protrusions. 
     
     
         5 . The arch drywall corner trim product of  claim 1  wherein the wall-facing surface of at least one of said flanges is prepared by coating with a mastic compound. 
     
     
         6 . The arch drywall corner trim product of  claim 5  wherein said mastic compound is an adhesive. 
     
     
         7 . The arch drywall corner trim product of  claim 6  wherein said adhesive is water-activated or pressure sensitive. 
     
     
         8 . The arch drywall corner trim product of  claim 1  wherein the wall-facing surface of at least one of said flanges is prepared by frocking. 
     
     
         9 . The arch drywall corner trim product of  claim 1  wherein both of said flanges are notched. 
     
     
         10 . The arch drywall corner trim product of  claim 1  further comprising a bead along said centerline. 
     
     
         11 . The arch drywall corner trim product of  claim 10  wherein said bead is notched.