Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1975-06-25
1977-12-27
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
93 33H, 93 35R, 93DIG1, 156267, 156497, 156498, 156510, B31B 2314, B31B 2360, B31B 4904
Patent
active
040653447
ABSTRACT:
The present invention provides a method and apparatus for the manufacture of generally rectangular plastic bags from a gusseted or flattened tubular, supply stock where the bags terminate in heat sealed closure at the bottom and the end opposite the bottom is generally open.
The method provided by the present invention includes feeding selected stock of elongate gusseted or flattened tubular plastic material, in a direction along the longitudinal axis of the material to heat seal bar means, sealing a portion of the tubular stock together, by heating the material, along a line generally transverse to the direction of movement of the stock to form the bottom of a first bag, and at generally the same time cutting the stock along a line transverse to the direction of travel of the stock at a location a selected distance from the seal bar in the direction of travel of the stock to form the open end of a second bag and, while the heat seal bar is in contact with the stock, exerting a force on the tail portion of the stock between the cut and the sealing bar to break the tail portion away from the seal formed by the sealing bar.
REFERENCES:
patent: 2800163 (1957-07-01), Rusch
patent: 3384528 (1968-05-01), Lehmacher et al.
patent: 3558406 (1971-01-01), Kugler
patent: 3575763 (1971-04-01), Ramsey
patent: 3586577 (1971-06-01), Bella
patent: 3813998 (1974-06-01), Lotto
Powell William A.
Steutermann Edward M.
Weist Industries Inc.
Wityshyn M. G.
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