Spiral bifilar welding sleeve
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United States of America Patent
Stats
-
Mar 13, 1984
Grant Date -
N/A
app pub date -
Mar 1, 1982
filing date -
Mar 1, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bifilar resistance element for use in preparing heating elements used in thermal bonding and the like, wherein two electrically conducting wires are embedded in a thermoplastic sheath which is fusible when sufficient current is passed through the bifilar resistance element. A heating element is prepared by joining the pair of wires in a length of the bifilar resistance element together at one end to form an electrically conductive path and then winding the length into a spiral shape. Two articles of thermoplastic material may be bonded together by placing the heating element in a recess simultaneously adjacent both articles with a pair of leads to the heating element extending externally from the two articles to be bonded, and applying an electrical current so that the thermoplastic sheath and a portion of the adjacent articles themselves are fused, to bond the articles together upon cooling.
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