Production of jackets for flexible magnetic disks, and apparatus for this purpose

Apparatus for the production of a jacket for flexible magnetic disks, in which jacket blanks are punched out of a web of film material, those surfaces of the blanks which are intended to be the inner surfaces of the jacket are covered with a nonwoven fabric, the individual blanks together with the nonwoven fabric are then folded into jacket form, and those parts of the blank overlapped in this procedure are joined to one another via tabs by welding, the magnetic storage disk being inserted into the jacket before the end tab is closed, and the welding temperature for each weld joint being produced, by resistance heating, through the formation, for a short duration, of a large number of spot welds at spatially separated points of said joint, said apparatus comprising a punching unit for producing jacket blanks from a film web, a unit for folding the blanks into jacket form and having a support surface for the jacket to be welded, and a welding strip which is arranged above said jacket and is electrically connected to a welding current source, and means for driving said welding strip toward the support surface with the aid of a movable holder, the welding strip consisting of a wavy electrical resistance belt which forms point-like weld surfaces and is fastened to the holder via a thermal insulation.