Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1986-12-08
1988-01-05
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493208, 493225, 493394, 493928, 156582, 1565831, 1565834, B31B 2364, B31B 2386
Patent
active
047173726
ABSTRACT:
Apparatus for producing a machine-direction intermittent heat seal in a moving web of plastic film including a block adapted to be supported on one side of the hem and having a plurality of wheels having heat conducting surfaces spaced around the periphery and mounted on the block at spaced locations in tandem for engaging the film along the path of the intermittent heat seal to be formed in the hem. The block has a corresponding plurality of surfaces each of which is adapted to be engaged by a side of one of the wheels. Gears interconnect the wheels to maintain the wheels in register with the intermittent portions of the heat seal in the hem during rotation of the wheels. A heater is provided for heating the block and its plurality of surfaces and springs are provided for maintaining the wheels in contact with the plurality of surfaces whereby movement of the hem through the heat sealing apparatus causes the plurality of wheels to rotate and maintain contact with the plurality of surfaces whereby the wheels are in turn heated by conduction from the block and produce the intermittent heat seal in the hem.
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Gilman Michael G.
McKillop Alexander J.
Mobil Oil Corporation
Schmidt Frederick R.
Speciale Charles J.
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