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US 9,409,372 B2Granted
Method for perforating tissue sheets
AssigneeKimberly-Clark Worldwide, Inc.
InventorsFrank Stephen Hada, James Leo Baggot, Robert Eugene Krautkramer
Life of this patent
Estimating the term…
Abstract
Curvilinear or other complex perforation patterns for paper products, such as paper towels and bath tissue, can be produced using a differential speed perforation nip formed between a rotating pattern roll and a moving anvil surface. The relative speed between the perforation elements on the surface of the pattern roll and the anvil surface shears the web at the perforation points.
Claims17
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.
Dependencies are inferred from the claim text.