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Thermoplastics welding method

  • US 4,090,899 A
  • Filed: 12/03/1975
  • Issued: 05/23/1978
  • Est. Priority Date: 12/06/1974
  • Status: Expired due to Term
First Claim
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1. A method of welding mutually overlapping portions of self-supporting objects made of weldable thermoplastic material, said self-supporting objects being capable of withstanding or supporting gas pressure produced in a welding zone without a significant deformation thereof, said welding being effected substantially without an external pressure which acts vertically to the welding zone, by heating to form a welding zone containing said thermoplastic material in an at least plastic state in an area between said mutually overlapping portions, said method comprising the step of providing an expanding agent in said welding zone, said agent producing at the temperature of said welding zone a gas pressure effective in said welding zone.

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