High speed vacuum porting

Details High speed vacuum porting High speed vacuum porting

B - Operations, Transporting

65

H

B65H 20/12 (2006.01) A61F 13/475 (2006.01) A61F 13/494 (2006.01) B65H 23/02 (2006.01) B65H 27/00 (2006.01)

Patent

CA 2547464

This invention proposes a new, improved method and apparatus for applying web segments to a traveling web. These web segments, sometimes called ears or wings, may be asymmetrical or otherwise incompatible with the usual slip-and-cut method. The asymmetrical shape may have differing web tensions which can cause the web segments to be improperly engaged with the vacuum holes on an anvil roll. The present invention utilizes both circumferential rows of vacuum holes and an additional pattern of ear retaining vacuum holes. The circumferential rows of vacuum holes are activated consecutively by vacuum commutation, however, the pattern of ear retaining vacuum holes are activated simultaneously to counter the effects of differing web tensions on the ear portions.

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