Patent Number: 7,820,271

Title: Laminates of films and methods and apparatus for their manufacture

Abstract: A laminate of thermoplastic polymeric films comprises a fluted ply A and non-fluted ply B, adhered to one another in bonded zones along some of the flute crests the fluted ply A. The wavelength of the flutes is preferably no more than 3 mm. Ply A has a generally uniform thickness or can have attenuated zones of lesser thickness extending parallel to the flute direction, each bonded zone being located mainly within an attenuated zone. The flutes can be sinuous with crests on both sides of ply A and can be adhered on each side to a ply B. The flutes can be filled with filler material, including reinforcement strands, and one or both sides can be perforated. The method and apparatus employ aligned grooved fluting rollers and a grooved laminating roller.

Inventors: Rasmussen; Ole-Bendt (CH-6316 Walchwil/Zug, CH)

Assignee:

International Classification: B29D 22/00 (20060101); B32B 3/28 (20060101); B65D 81/02 (20060101); B65D 81/03 (20060101); A41D 3/04 (20060101)

Expiration Date: 2018-10-26 0:00:00