Abstract: A method of continuously producing a flexible drywall joint filler having a central spline portion adapted for cooperation with a joint defined between a pair of adjacent sidewall panels and a pair of substantially thin edge portions, comprises extruding at a predetermined extrusion rate a continuous strip of flexible material having a predetermined width, pulling the extruded pre-formed strip of flexible material at a pulling rate greater than the extrusion rate thereby completely forming the thin edge portions on the strip and reducing the predetermined width by about 30-65% to a completed width, and cooling the material at the completed width to form a continuous strip of flexible drywall joint filler having "feathered" edge portions.

Abstract: A drywall joint filler for joining together two conventional drywall building panels formed as an extending flexible strip of plastic or the like having a central spline which extends into the space between the panels to properly locate the joint and which tapers to a feather edge as it extends away from the spline. The spline is preferably provided with whiskers or spurs to provide additional holding forces. The joint is preferably adhered to the abutting panels by double-coated adhesive paper strips.