초록 ▼

A bag pack comprises a plurality of easy open handle bags. The bags are easy to open because the exterior surfaces of the bags are cold-welded together so that when one bag is pulled from the pack, the adjacent next bag is at least partly open. The external surfaces of the bags are not welded to the

A bag pack comprises a plurality of easy open handle bags. The bags are easy to open because the exterior surfaces of the bags are cold-welded together so that when one bag is pulled from the pack, the adjacent next bag is at least partly open. The external surfaces of the bags are not welded to the internal surfaces of the bags during the pressure welding process, because the material that forms the external surface of the bag is treated with a corona discharge, which renders the external surface more susceptible to cold weldings. Optionally a static charge is induced on the bags so that each bag is at a different voltage than the adjacent bags so the bags attract each other, and the panels of each individual bag repel each other, to contribute to the easy open feature.

대표청구항 ▼

A method for forming a bag pack comprising a plurality of easy open bags from a elongated, flattened tube, the tube having a external surface and an internal surface, the method comprising the steps of: (a) treating at least a portion of the external surface of the tube with a corona discharge; (b)

A method for forming a bag pack comprising a plurality of easy open bags from a elongated, flattened tube, the tube having a external surface and an internal surface, the method comprising the steps of: (a) treating at least a portion of the external surface of the tube with a corona discharge; (b) forming a series of individual bags from the treated tube, wherein each individual bag of said series of bags has a front panel with respective exterior and interior surfaces and a back panel with respective exterior and interior surfaces; (c) inducing an alternating static charge on the series of bags by inducing a first charge on said respective exterior and interior surfaces of both the front and back panels of a first individual bag and by inducing a second charge on said respective exterior and interior surfaces of both the front and back panels of a second individual bag adjacent to said first individual bag, so that at least a portion of each bag is charged, with adjacent bags being at different polarities and said front and rear panels of the individual bags are at the same polarity, thereby forming a series of alternatively charged bags; (d) stacking the series of alternatively charged bags in a pack such that adjacent exterior surfaces of respective front and back panels of each adjacently stacked bag attract each other and the interior surfaces of respective front and back panels of each individual bag repel each other so the bags are easy to open; and (e) pressure welding the exterior surfaces of all the bags in the pack together at selected spots, wherein the power of the corona discharge and the force of the pressure weld are such that (i) the interior surfaces of each bag are not welded together, (ii) when a respective bag is pulled from the pack, an adjacent next bag in the pack is at least partly opened, and (iii) when a bag is pulled from the pack, the adjacent next bag is not torn at the selected spots.