Strapping joint and method and apparatus for forming same

B - Operations – Transporting – 65 – D

Patent

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B65D 63/10 (2006.01) B29C 65/06 (2006.01) B65B 13/32 (2006.01) B65B 51/22 (2006.01)

Patent

CA 1046738

Abstract of the Disclosure A joint having improved snag resistance and peel strength is formed between overlapping end portions of a thermoplastic strap. The thermoplastic strap is formed into a loop having overlapping inner and outer end portions which are joined to one another by a resolidified thin layer of formerly melted material from each of the overlapping strap end portions. Resolidified material extends completely to an in- wardly tapered end of the outer strap end portion to provide the improved joint. A resolidified mass of formerly molten material also is present in front of the tapered end to further protect it against snagging. The improved joint can be formed utilizing a fric- tion-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 com- pressed surfaces. During this time, movement of the jaws toward one another is continued to compress the remaining over- lapping 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.

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