Extrusion Dies, Inc.

Jeffrey M Seckora

Vernon J Krupa

Brian M Pitsch

A dual-chamber vacuum box for pinning a thermoplastic web to a cooling roll includes a primary vacuum chamber connected to a first vacuum source. The primary vacuum chamber has a first side located proximate a surface of the web at a line of contact between the web and the cooling roll and a second side opposite the first side. A secondary vacuum is chamber connected to a second vacuum source and is positioned adjacent the second side of the primary vacuum chamber. Apparatus is disposed between the primary and secondary vacuum chambers for creating a pressure variation along the line of contact between the web and the cooling roll.

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Chippewa Falls, WI, United States of America

Jeffrey M Seckora