Device and method for producing tubes

摘要

Flat material for hose production is pulled and formed around a hollow filling tube with a welding unit. The welding unit comprises an electrically conductive heating strip(2) parallel to the transporting direction with flat areas(2') for contacting the hose material edges to be welded. A controllable electrical supply is connected to the front and rear ends of the heating strip. Independent claims are made for: a) a process for producing thermoplastic tube using the claimed welding equipment in which the contact area(2') of the heating strip(2) is located between the two material edges to be joined as the material moves forwards and softens the plastic. The hose is progressively formed as it is drawn over a hollow filling tube and the softened edges are pressed together to effect a continuous longitudinal weld; b) a use of the welding equipment for producing tubular bags.