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Method and apparatus for producing a welded joint in thermoplastic strap with differential pressure

  • US 5,348,781 A
  • Filed: 10/08/1993
  • Issued: 09/20/1994
  • Est. Priority Date: 10/30/1992
  • Status: Expired due to Fees
First Claim
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1. A welded joint defined between two lengths of thermoplastic strap, comprising:

  • said two lengths of thermoplastic strap being disposed in a face-to-face overlapping relationship with respect to each other at a location at which said welded joint is to be defined;

    at least part of the thickness of each one of said two strap lengths being resolidified from a fused state during which said two lengths of said strap disposed at said location at which said welded joint is to be defined were subjected to above-ambient pressure;

    said resolidified thickness part of one of said two strap lengths being merged with the resolidified thickness part of the other one of said two strap lengths so as to define a continuous resolidified region; and

    said resolidified region including a peripheral region, and an adjacent central region having a substantially disc-like configuration, wherein said above-ambient pressure was maintained, during said fused state, for a longer period of time within said central region than within said peripheral region.

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