| 摘要 |
Two film strips (1) are placed flat against each other and moved continuously forward to a point where they are transversely welded together at intervals corresponding to the sleeve dimension in the transporting direction (2). The welded strips are then cut into individual sleeves by a transverse cut. An Independent claim is also included for the process equipment which includes a transporting system for two strips (1) flat on each other, a transverse welding unit and a parting unit for cutting welded strips in the transverse direction during forward movement. Preferred Features: The strips are welded along at least one long edge during forward movement by a welding wheel (7) rotating around an axis parallel to the strip surface and normal to the transporting direction at a peripheral speed corresponding with the linear speed of the strips. The welding wheel acts in conjunction with another wheel (8) on the opposite side of the strips (1). Transverse welding is effected by a welding bar (12) and an opposing bar (13) mounted on rolls (10,11) on opposite sides of the strips and rotating at the same speed as the latter. The welding bar may perform a combined welding and cutting action. Alternatively, a separate knife (20) rotates in unison with the moving strips. Holes are punched along one edge of the sleeves by punches (16) around one roll (14) and corresponding recesses (17) around an opposing roll (15). |
