Patent ID: 9005094
Filing Date: 2015-04-14
Classification: B31B,B65D

Abstract:
1. A method for forming a self-sealing valve bag comprising steps of: unrolling a first web of material and a second web of material, the first and second webs of material both having an upper and a lower side; creating a combined web by contacting material from the upper side of the first web material from the lower side of the second web, the combined web having a valve side and an opposing open side; applying sealing lines to the combined web using sealing apparatus located externally to the combined web, such that the first web is sealed to the second web along part of the valve side, the sealing lines defining a valve portion in the valve side; after the step of applying the sealing lines, separating the first web and the second web at the open side, and folding the first web and the second web outwardly, until a section of the lower side of the first web contacts a section of the upper side of the second web; and sealing together the contacting sections of the lower side of the first web and the upper side of the second web to form three other sides of the bag.