Machine for applying a semipermeable patch on a plastic bag
AssigneeNational Distillers and Chemical Corporation
InventorHarold E. Henderson
Life of this patent
Estimating the term…
Abstract
The machine includes a horizontal support for a plastic bag and a vertically movable heat-sealing head pivoted to the support for upward movement through an aperture in the support to contact the plastic bag. A vertically movable pressure platen having a vacuum head for holding a patch thereon is mounted directly above the heat-sealing head and is adapted to be moved into engagement with the plastic bag so that the patch can be heat-sealed to the bag. A cutter is mounted adjacent the pressure platen for reciprocating movement along an oblique path to intersect the aperture in the support directly beneath the pressure platen to provide a slit in the plastic bag prior to the heat-sealing of the patch on the bag over the slit.
Claims5
A machine for perforating a plastic sheet and securing a patch of the plastic sheet over said perforation comprise support means for holding the plastic sheet in position, cutting means located above said support means and movable downwardly to perforate the plastic sheet, heat-sealing means movably mounted below said support means for vertical movement upwardly into engagement with said plastic sheet and patch applying means movably mounted vertically above said heat-sealing means for moving said patch into engagement with said plastic sheet opposite said heat-sealing head and for pressing said patch and plastic sheet against said head, the axes of movement of said cutting means and said patch applying means intersecting at said support means.
Dependencies are inferred from the claim text.