Method and apparatus for forming a strapping joint

B - Operations – Transporting – 29 – C

Patent

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Details

154/29.03, 156/3

B29C 27/08 (1980.01)

Patent

CA 1070600

Abstract of the Disclosure Apparatus for forming an improved joint when utilizing friction-fusion process by positioning overlapping portions of a thermoplastic strap between a pair of welding jaws having complementary opposing strap gripping surfaces. The strap gripping surface of one of the jaws includes a protrusion at an end thereof disposed perpendicularly to the strap length. The one jaw is moved perpendicular toward the other jaw so that the protrusion initially engages the adjacent overlapping strap portion prior to engagement by the remainder of the strap gripping surface, whereby the facing surfaces of the overlapping strap portions in alignment with the protrusion are compressed into heat generating frictional engagement with one another and the remaining overlapping strap portions between the jaws are gripped by adjacent gripping surfaces. The jaw opposite to the jaw with the protrusion is then moved in a direction generally parallel to the strap gripping surfaces while the overlapping strap portions in alignment with the protrusion are compressed to initiate interface melting between the compressed surfaces. During this time, movement of the jaws toward one another is continued to compress the remaining overlapping strap portions between the jaws into heat generating frictional engagement while the generally parallel movement of the one jaw is continued to expand interface melting to the facing surfaces of the remaining overlapping strap portions between the jaws.

312089

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