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US 5,273,511 AGranted
Method to improve welding of profiled plastic film or tape
AssigneeIllinois Tool Works Inc.
InventorHugo Boeckman
Life of this patent
Estimating the term…
Abstract
A method for providing a welded side seam area in a plastic bag or package having interlocking male and female profile sections on plies of plastic sheeting material includes the provision of cut-outs through one of the male and female profile sections and contiguous plastic sheeting material at preselected intervals therealong. The welds, which may be provided by a seal bar or jaws, are provided along lines including or passing through the cut-outs. A thinner and more leak-resistant side seam area between bags or packages is the result.
Claims3
A method for providing a welded seam in a plastic package having a zipper comprising:
- providing a sheet of plastic material having a continuous female profile section;
- providing a sheet of plastic material having a continuous male profile section;
- punching a plurality of cut-outs at preselected intervals along one of said continuous female profile section or continuous male profile section, said cut-outs removing sections of one of said profile sections and forming holes through the sheet of plastic material contiguous therewith;
- inserting said continuous male profile section into said continuous female profile section to join said sheets of plastic material together;
- and
- welding said sheets of plastic material together along lines including said cut-outs.
3 more elements
Dependencies are inferred from the claim text.