Patent ID: 9409372
Filing Date: 2016-08-09
CPC Classification: B26D,B26F,B31D,B31F

Claim Text:
1. A method of perforating a paper web comprising: (a) carrying a moving paper web over a rotating pattern roll having protruding perforation elements which protrude from the surface of the pattern roll and are arranged on the surface of the pattern roll in a perforation pattern, whereby one side of the paper web is in contact with and supported by the surface of the pattern roll and wherein the angle of wrap of the paper web around the pattern roll is about 180 degrees or greater, said paper web and the surface of the rotating pattern roll moving at the same speed; and (b) passing the paper web through nips formed between the protruding perforation elements and a moving anvil surface which is traveling at a speed that is faster than the speed of the paper web, whereby the paper web is locally sheared and perforated in the nips to create a perforation pattern in the web.