Apparatus for welding sheets

专利名称：Apparatus for welding sheets发明人：ZURN, KARL申请号：EP85102071.9申请日：19850226公开号：EP0155548B1公开日：19880518

摘要：A device for welding foils, webs or bags having differing thickness along a line tobe welded at right angles to a conveying direction includes a pair of elongated weldingdies movable relative to one another and one of which has an elongated, periodicallyheatable electric resistance heating element having serially-connected sections ofdiffering 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. Eachsection of differing resistance corresponds in length and position to the differingthickness along the line to be welded and is so dimensioned that, prior to initial contactwith that line to be welded, the heating element has a higher temperature in the zones oflesser cross-sectional area corresponding to the thicker areas of the line to be weldedthan at a the at the zones of greater cross sectional area corresponding to the thinnerareas thereof. The zonal variations in cross-sectional area are so dimensioned that theheating element has a constant temperature over its entire length immediately aftercontacting te line to be welded to form a continuous weld.

申请人：OPTIMA-MASCHINENFABRIK DR. BUHLER GMBH & CO.,OPTIMA-MASCHINENFABRIK DR. BUHLER GMBH & CO.

代理机构：Patentanwälte Ruff, Beier, Schöndorf und Mütschele

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