A method for splicing a web of packaging material is provided. The method involves guiding a first web of packaging material through an automatic splicing device, determining the position of at least one mark of the first web of packaging material by a detector, moving the first web of packaging material based on the position of the at least one mark of the first web of packaging material such that a specific area of the first web of packaging material is arranged in proximity to a cutting unit, and cutting the first web of packaging material in order to form a separate leading part of the first web of packaging material. The method may also involve introducing a new leading part of a second web of packaging material into the automatic splicing device, determining the position of at least one mark of the second web of packaging material, moving the second web of packaging material based on the position of the at least one mark of the second web of packaging material such that a specific area of the second web of packaging material is arranged in proximity to a sealing arm of the cutting unit, and sealing the separate leading part of the first web of packaging material and the second web of packaging material.

A method for splicing a web of packaging material is provided. The method comprises: guiding the web of packaging material through an automatic splicing device; determining the position of at least one mark of the material web by means of a detector; moving the material web based on the determined positon such that a specific area of the material web is arranged in proximity to a cutting unit; cutting the material web in order to form a separate leading part of the material web; introducing a new leading part of a separate material web into the automatic splicing device; determining the position of at least one mark of the newly introduced material web; moving the newly introduced material web based on the determined position such that a specific area of the newly introduced material web is arranged in proximity to a sealing arm of the cutting unit; and sealing the separate leading part of the material web and the newly introduced material web.

Described herein is a sheet supply apparatus for continuously supplying sheets while splicing the leading edge of the sheet of a standby roll to the trailing end of a sheet being unwound from a working roll by using an auto splicer, the sheet supply apparatus including: a turret unwinder provided with fixation chucks that each fix both ends of a paper tube, and configured to switch the positions of the standby and working rolls; a detector configured to detect the position of one of both axial ends of the standby roll; a corrector configured to be connected to each of the fixation chucks and to correct the position of the standby roll; and a controller configured to align an end of the standby roll so that the end of the standby roll is aligned with the end of the working roll while correcting the position of the standby roll.

Described is a machine for making filter bags including: a rotary carousel having a plurality of grippers for retaining respective filtering chambers; each gripper is configured for moving the filtering chamber to a pick-up zone; a first reel of a first strip and a second reel of a second strip; a selector device including a first channel engaged by the first strip arriving from the first reel, and a second channel engaged by the second strip arriving from the second reel; the selector device has a shared outfeed at the pick-up zone; first and second movement means, positioned, respectively, along the first and the second channel for feeding, respectively, the first strip of tags and the second strip of tags, the first and second movement means are operated selectively in such a way as to feed alternately the first or the second strip.