Boxable Mesh Adhesive Drywall Corner Trim

Abstract

A boxable drywall corner trim including an elongated semi-rigid member that forms a pair of flanges joined at a grooved hinge along a centerline. Each of the flanges can have a thinner part and a thicker part joined at a step that is approximately parallel to the centerline a predetermined distance from the centerline. The thicker part of the flanges can form a protruding nose member that makes the piece boxable by preventing the cross-over of wet drywall mastic or mud from one flange to the other. The thinner portion of the flange may optionally be perforated with a pattern of punched holes of any configuration throughout the flange assembly. The piece can have a wall-facing paper or other fibrous layer of material that has a tacky adhesive on its wall-facing side. The adhesive can be in a pattern of dots, ridges, lines or any other pattern, or the adhesive can be continuously coated on the surface. A layer of mesh can be trapped between the semi-rigid member and the outer paper layer, the mesh may or may not optionally penetrate into the plastic or other material of the semi-rigid member. When the entire piece is hot extruded, the mesh normally penetrates the plastic.

1 . An extruded corner drywall trim capable of being applied to a corner and wet-mudded on both sides comprising:
 a pair of semi-rigid elongated plastic flanges each with a wall-facing surface and a room-facing surface joined edge-to-edge lengthwise along a centerline, wherein said flanges can flex about said centerline;   each of said flanges having a thinner region and a thicker region separated by a step, said step being approximately parallel to the centerline, the thicker region forming a protruding nose member along said centerline having a room-facing surface prepared to directly receive paint or texture, and wherein said thinner region has a flat or tapered continuous surface extending away from said step to an edge, said step and said flat or tapered continuous surface forming a region that prevents crossover of wet mud from one of said flanges to the other; and   a layer of mesh material or apertured material or perforated material on each of said flanges extending along said continuous surface approximately from the step to and beyond the edge of said flange for a predetermined distance;   wherein the wall-facing surface of said flanges include regions coated with adhesive;   wherein said mesh material, apertured material or perforated material is captured between a fibrous layer and at least one of said semi-rigid flanges;   wherein said mesh penetrates into said semi-rigid member.   
   
   
       2 . The corner trim of  claim 1  wherein said flanges include a plurality of punched holes. 
   
   
       3 . The corner trim of  claim 1  wherein said protruding nose is covered with a fibrous layer. 
   
   
       4 . The corner trim of  claim 1  wherein said regions coated with adhesive are dots. 
   
   
       5 . The corner trim of  claim 1  wherein said regions coated with adhesive are ridges. 
   
   
       6 . The corner trim of  claim 1  wherein the entire wall-facing surface of said flanges are coated with a continuous layer of adhesive. 
   
   
       7 . The corner trim of  claim 1  wherein said adhesive is tacky, whereby said trim piece can be applied, repositioned, removed and re-applied. 
   
   
       8 . The corner trim of  claim 1  wherein a wall-facing surface of said mesh is coated with an adhesive. 
   
   
       9 . The corner trim of  claim 1  wherein the room-facing surface of said flanges is coated with a fibrous layer. 
   
   
       10 . The corner trim of  claim 9  wherein said mesh material is captured between said fibrous layer and said semi-rigid flange. 
   
   
       11 . A drywall corner trim piece comprising, in combination:
 an elongated semi-rigid base member forming two flanges coupled together with a hinge, said hinge forming a centerline, said flanges having wall-facing surfaces and room facing surfaces;   a first paper layer covering said wall-facing surfaces of said flanges, wherein said first paper layer has tacky adhesive on its wall-facing surface;   a layer of mesh material attached and cooperating with the room-facing surface of said flanges, said mesh material extending from a point on said flanges away from said centerline to a point a predetermined distance beyond the edges of said flanges;   wherein said mesh material penetrates into said flanges.   
   
   
       12 . The drywall corner trim piece of  claim 11  wherein said tacky adhesive is a matrix of dots or ribs. 
   
   
       13 . The drywall corner trim piece of  claim 11  wherein said semi-rigid member is boxable. 
   
   
       14 . The drywall corner trim piece of  claim 11  further comprising a second paper layer covering the room-facing surfaces of said flanges. 
   
   
       15 . The drywall corner trim piece of  claim 14  wherein said layer of mesh material is captured by said second paper layer.