Method to improve welding of profiled plastic film or tape

• US 5,273,511 A
• Filed: 03/30/1993
• Issued: 12/28/1993
• Est. Priority Date: 03/30/1993
• Status: Expired due to Term

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Illinois Tool Works Inc.
• Inventors: Boeckman, Hugo
• Primary Examiner(s): Lavinder, Jack
• Application Number:
  US08/039,919
• Time in Patent Office: 273 Days
• Field of Search: 493/194-, 156/251, 156/253, 156/256, 156/324, 156/290
• US Class Current: 493/195
• CPC Class Codes: B29C 2793/0018 for making a hole
• CPC Class Codes: B29C 2793/0081 before shaping
• CPC Class Codes: B29C 65/02 by heating, with or without pressure
• CPC Class Codes: B29C 65/08 using ultrasonic vibrations non-plastics element to plastics elements B29C65/645
• CPC Class Codes: B29C 65/58 Snap connection
• CPC Class Codes: B29C 65/72 by combined operations or combined techniques, e.g. welding and stitching
• CPC Class Codes: B29C 66/02241 Cutting, e.g. by using waterjets, or sawing using heat B29C66/0246; cutting-off or cutting-out a part of a strip-like or sheet-like material, transferring that part and fixing it to an article B29C69/005
• CPC Class Codes: B29C 66/02242 Perforating or boring
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/346 Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration
• CPC Class Codes: B29C 66/43 Joining a relatively small portion of the surface of said articles B29C66/45 takes precedence
• CPC Class Codes: B29C 66/723 being multi-layered B29C66/7292, B29C66/72941 take precedence
• CPC Class Codes: B29L 2005/00 Elements of slide fasteners
• CPC Class Codes: B29L 2031/7128 Bags, sacks, sachets tea bags B29L2031/7122; medical bags B29L2031/7148
• CPC Class Codes: B31B 70/8131 Making bags having interengaging closure elements
• CPC Class Codes: B65D 33/2558 the slide fastener having a non-constant section throughout the length of the fastener, e.g. slightly undulated interlocking members or castellated stringers
• CPC Class Codes: Y10T 156/1054 and simultaneously bonding [e.g., cut-seaming]
• CPC Class Codes: Y10T 156/1062 Prior to assembly

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.

Claims

1. 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.

2. A method as claimed in claim 1 wherein said cut-outs are punched through said continuous female profile section.

3. A method as claimed in claim 1 wherein said cut-outs are punched through said continuous male profile section.