Method and apparatus for producing a welded joint in thermoplast

Details Method and apparatus for producing a welded joint in thermoplast Method and apparatus for producing a welded joint in thermoplast

1993-10-08

1994-09-20

Thomas, Alexander S.

Stock material or miscellaneous articles

Sheets or webs edge spliced or joined

428220, 156 735, B32B 518

Patent

active

053487818

ABSTRACT:
A novel method and apparatus are provided for making an improved welded joint between overlapping lengths of thermoplastic strap. The welded joint includes a central region and an adjacent peripheral region. The pressure on the strap joint during formation is released first in the peripheral region and subsequently in the central region. An embodiment of tile apparatus for making such a joint includes an anvil, a central strap-engaging member, a peripheral strap engaging member, and a mechanism for moving the anvil subsequently to three positions. At a first position the overlapping strap lengths are pressed between the anvil and both the central and peripheral strap-engaging members. In the second position of the anvil the peripheral strap-engaging member does not press against the strap lengths while the central strap-engaging member continues to press the strap lengths against the anvil. In the third position of the anvil, the anvil and strap-engaging members are sufficiently spaced apart to release all of the pressure on the strap lengths.

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