Apparatus for producing a machine-direction heat seal

Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container

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Details

493208, 493225, 493394, 493928, 156582, 1565831, 1565834, B31B 2364, B31B 2386

Patent

active

047215011

ABSTRACT:
Apparatus for producing a machine-direction 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 rollers mounted thereon at spaced locations in tandem for engaging the film along the path of the 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 rollers. A heater is provided for heating the block and its plurality of surfaces and the rollers are maintained in contact with the plurality of surfaces whereby movement of the hem though the heat sealing apparatus causes the plurality of rollers to rotate and maintain contact with the plurality of surfaces whereby the rollers are in turn heated by conduction from the block and produce the heat seal in the hem.

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