Method and apparatus for the production of shear seals in thermoplastic materials
AssigneeMobil Oil Corporation
InventorMyron L. Moffitt
Life of this patent
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Abstract
A method and apparatus for the production of improved heat seals in thermoplastic materials which includes causing displacement of thermoplastic material in the area being sealed during the sealing operation. The displaced thermoplastic serves to reinforce that area of the seal which is normally weakened as a result of the heat sealing step.
Claims2
In a method for heat sealing together multiple superposed layers of thermoplastic material comprising bringing a heat sealing element into sealing engagement with said layers to effect sealing, the improvement which comprises laterally displacing a portion of said thermoplastic material in the heatseal area with said heat seal element while said element is in sealing engagement with said layers, said lateral displacement of material being achieved by lateral displacement of said sealing element.
Heat sealing apparatus comprising a resilient support surface, a heat sealing element adapted for sealing engagement in a seal area, multiple layers of thermoplastic supported on said support surface and displacement means to laterally displace molten portions of said layers in said seal area during sealing engagement of said sealing element, said displacement means comprising means to laterally displace said heat-seal element.
Dependencies are inferred from the claim text.