Device for welding foils having different thickness along a weld

Details Device for welding foils having different thickness along a weld Device for welding foils having different thickness along a weld

1985-03-07

1987-03-10

Bartis, Anthony

Electric heating

Heating devices

Combined with pressure application means

1565831, 1565839, 219221, 219228, H05B 300, B65B 5114, B30B 1534

Patent

active

046492593

ABSTRACT:
A device for welding foils, webs or bags having differing thickness along a line to be welded at right angles to a conveying direction includes a pair of elongated welding dies movable relative to one another and one of which has an elongated, periodically heatable electric resistance heating element having serially-connected sections of differing electrical resistance along its length defined by zonal variations in cross sectional area of the heating element, e.g., areas of differing heating element width. Each section of differing resistance corresponds in length and position to the differing thickness along the line to be welded and is so dimensioned that, prior to initial contact with that line to be welded, the heating element has a higher temperature in the zones of lesser cross-sectional area corresponding to the thicker areas of the line to be welded than at a the at the zones of greater cross sectional area corresponding to the thinner areas thereof. The zonal variations in cross-sectional area are so dimensioned that the heating element has a constant temperature over its entire length immediately after contacting te line to be welded to form a continuous weld.

REFERENCES:
patent: 2489643 (1949-11-01), Hunter
patent: 2802086 (1957-08-01), Fener
patent: 3005402 (1961-10-01), Starger et al.
patent: 3095492 (1963-06-01), Gaiennie
patent: 3196068 (1965-07-01), Schoder et al.
patent: 3624836 (1971-11-01), Rohdin
patent: 4412123 (1983-10-01), Ammann et al.

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