Abstract: A method for sealing a bag which is formed from a tube of material and has front and rear walls, a pair of opposing, inward-tending gusset folds, each of these folds having front and rear vertical creases. The steps may include slitting each of the opposing front creases along longitudinal their axes to obtain front and rear plies. A first rearward fold is formed by rearwardly folding the rear ply together with the inward-tending gusset folds such that the inner surface of the rear ply is visible. A second rearward fold is formed by rearwardly folding the first fold until the inner surface of the rear ply lays against the rear wall of the bag.

Abstract: A polymer bag including a layer of a woven polymer and a method of sealing the gusseted bag by utilizing plasma treatment for sealing at least a pinch bottom of the bag, and additionally, profile strips for reclosably opening and closing the top of the bag.

Abstract: An assembly for forming a pinch bottom bag from a tube of material including a slitter for forming slits in the tube to define a forward ply and a rear ply, a first fold track for folding the rear ply to define a folded rear ply and a second fold track for folding the front ply and the folded rear ply so the front ply contacts the rear ply to define a pinch bottom seal.

Abstract: A method for sealing a bag which is formed from a tube of material and has front and rear sides, a pair of opposing, inward-tending gusset folds, each of these folds having front and rear vertical creases, comprising the steps of slitting each of the opposing front creases along longitudinal their axes, obtaining front and rear plies. A first rearward fold is formed by rearwardly folding the rear plies together with the rear vertical creases such that the inner surface of the rear ply is visible. A second rearward fold is formed by rearwardly folding the first fold until the inner surface of the rear ply lays against the rear side of the bag.