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US 6,250,048 B1Granted
Longitudinal seam sealer for polyethylene material
AssigneeTriangle Package Machinery Company
InventorJohn M. Linkiewicz
Life of this patent
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AssigneeTriangle Package Machinery Company
InventorJohn M. Linkiewicz
Estimating the term…
A form-fill-seal machine in which a heated longitudinal seam sealer continuously forms a longitudinal lap seam along lapped edges of the tube being formed. This longitudinal lap seam sealer can be used in machines having conventional cross sealing jaws as well as in machines in which the cross sealing jaws move in the direction of the moving film during the cross sealing operation. The heated longitudinal seam sealer includes a wafer thin internal hot air dispenser that discharges hot air from both surfaces on the surfaces to be fused together. The heated longitudinal seam sealer also includes an external hot air dispenser that includes a plurality of hot air discharge jets through which hot air is discharges on the outer surface of one of the overlapped edges that not only provides necessary heat to cause fusion but also exerts sufficient pressure on the overlapped edge to insure proper sealing.
The method of forming a lap seal in a heat sealable sheet of material comprising the steps of:
The method of continuously forming packages having a longitudinal lap seal from heat sealable material comprising the steps of:
Dependencies are inferred from the claim text.