Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1973-03-08
1977-01-04
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156304, 156504, 156507, 156517, 156544, B31F 500, B65H 1908
Patent
active
040010678
ABSTRACT:
This invention relates to butt welding sheets of thermoplastic material. More specifically, this invention relates to an apparatus and a process for performing this operation in an improved manner by controlling the temperature of the means used to heat and cut sections of the thermoplastic material. The apparatus and process of this invention concerns switching means response to the length of the cutting means (the length being proportional to the temperature of the cutting means) which controls a power source used to pass current through the cutting means. The current produces heat due to the electrical resistance of the cutting means whenever the cutting means shortens due to a decrease in temperature. An increase of a predetermined amount in length of the cutting means, due to a proportional temperature increase, deactivates the heating circuit. The cutting means temperature control of this disclosure also includes an insulated enclosure having a gate through which the cutting means passes, the gate being comprised of adjacent sections of a flexible material. The enclosure thus conserves heat and inhibits external air currents from contacting and cooling the cutting means.
REFERENCES:
patent: 2707985 (1955-05-01), Binnall
patent: 3015600 (1962-01-01), Cook
patent: 3135077 (1964-06-01), Siegel et al.
patent: 3384527 (1968-05-01), Fener
patent: 3586584 (1971-06-01), Wilkins
patent: 3595456 (1971-07-01), Rosenthal
patent: 3721801 (1973-03-01), Bate
patent: 3769124 (1973-10-01), Johnson
patent: 3834971 (1974-09-01), Johnson
Gilman M. G.
Huggett C. A.
Malone C. A.
Mobil Oil Corporation
Powell William A.
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