WEB CUTTING APPARATUS.

摘要

PCT No. PCT/GB93/02645 Sec. 371 Date Jun. 23, 1996 Sec. 102(e) Date Jun. 23, 1996 PCT Filed Dec. 23, 1993 PCT Pub. No. WO94/14583 PCT Pub. Date Jul. 7, 1994Transverse cuts are made in a web using a cutter/anvil combination which is subjected to high frequency vibration, preferable ultrasound. In one arrangement, particularly for cutting tea bag webs, a rotary cutter drum (4) cooperates with an ultrasonically-vibrated anvil 12. The web may be simultaneously sealed and cut by means of a modified drum (202) having sealer/cutter elements (208, 210). In other arrangements, particularly for cutting cork paper on a machine for assembling filter cigarettes, the paper is severed on a drum (106, 122, 192, 350) cooperating with an ultrasonically-vibrated anvil (110, 194, 312) or directly on an ultrasonically-vibrated drum (144, 160, 170, 180).