Patent ID: 6669615
Filing Date: 2003-12-30
Classification: B29C,B29K,B31B,B65D,Y10T

Abstract:
A process of hinging at least two layers of plastic film material together in a high speed plastic bag line comprising the steps of:sequentially forming plastic bags, each plastic bag including a front panel of plastic film having two substantially parallel side edges; a rear panel of plastic film having two substantially parallel side edges; a fastening of the front panel and rear panel for forming a continuous periphery to the bag; and, a bottom joining a bottom of the front panel, and a bottom of the rear panel at substantial right angles to the side edges of the front panel and rear panel; whereby the bag has a closed bottom, a continuous closed periphery, and an open top; an improvement in providing each bag with hinges in two adjacent layers of the plastic bag in the high speed bag line during the forming of the bag step, the process comprising the steps of: juxtaposing at least first and second plastic films of the bag to one another in a disposition for hinging; providing at least one compression die on at least one side of the juxtaposed at least first and second plastic films, the compression die having the size and shape of the hinge desired; impressing the compression die across the juxtaposed first and second plastic films to produce a temperature and pressure sufficient to form a hinge in the at least first and second plastic films together, the impressing having insufficient temperature and pressure to permanently fuse the first and second plastic films together so that the films when folded at the hinge each retain structural integrity sufficient to form the bag.