Process for heat-sealing thermoplastic conduits

Details Process for heat-sealing thermoplastic conduits Process for heat-sealing thermoplastic conduits

1986-04-21

1987-06-02

Czaja, Donald E.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156294, 1563042, 156318, 264230, 219535, 219544, 219499, 219517, B32B 108

Patent

active

046700781

ABSTRACT:
A system for heat-sealing thermoplastic conduits involves a thermoplastic sleeve surrounding an electrically conductive heating wire arranged in a coil. A bridging conductor is located adjacent the heating element, but is separated from it by an insulation layer of predetermined thickness. When the sleeve is heated by supplying electric power to the heating element, the entire heating element generates heat during a first phase in which fusion pressure is applied between the sleeve and pipes being connected. The bridging connector is forced into contact with selected coils of the heating element to initiate a second phase. In the second phase, the heat produced in the area of the selected coils is automatically reduced by short circuiting such coils.

REFERENCES:
patent: 3378672 (1968-04-01), Blumenkranz
patent: 3506519 (1970-04-01), Blumenkranz
patent: 4096017 (1978-06-01), Wyke
patent: 4224505 (1980-09-01), Sturm
patent: 4455482 (1984-06-01), Grandllement
patent: 4486650 (1984-12-01), Bridgstock
patent: 4493985 (1985-01-01), Keller
patent: 4530521 (1985-07-01), Nyffeuer
patent: 4536644 (1985-08-01), Thalmann

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