Electrode sealing system for thermoplastic tube

Details Electrode sealing system for thermoplastic tube Electrode sealing system for thermoplastic tube

1981-07-23

1983-05-17

Shaw, C. C.

Electric heating

Metal heating

Of cylinders

219 1053, 219 1077, 219 1067, 1562744, 1563806, H05B 654, B32B 1902

Patent

active

043841864

ABSTRACT:
A system for hermetically sealing a thermoplastic tube during each cycle of operation of the system. A hand-holdable sealing gun has a pair of electrodes between which a tube to be sealed is placed. One of the electrodes is fixed and the other is moved by the core of a solenoid on which the moveable electrode is mounted. An RF field is established between the two electrodes to heat the tube between them. A limit switch is closed to terminate the RF field when the distance between the electrodes reaches a predetermined minimum distance. A trigger switch on the gun when squeezed initiates a cycle of operation of the system. A power supply, a source of RF energy, a mode switch and a second trigger switch are mounted in or on a housing. A bracket is also mounted on the housing for the sealing gun. The bracket positions the gun so that it can be operated in a fixed position. A mode switch determines whether the system will operate with the sealing gun held being in the hand of an operator or in a fixed mode of operation with the gun mounted on a bracket on the housing. A single cable connects the sealing gun with the power supply, the RF source, DC power supply and selected control switches which are mounted on the housing.

REFERENCES:
patent: 2820875 (1958-01-01), Werych et al.
patent: 3281566 (1966-10-01), Zelnick
patent: 4013860 (1977-03-01), Hosterman et al.
patent: 4186292 (1980-01-01), Acker

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