Dual-chamber vacuum box

Details Dual-chamber vacuum box Dual-chamber vacuum box

1995-02-01

1997-04-08

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Means casting fluent stock operably associated with shaping...

264101, 264556, 425388, B29C 3942

Patent

active

056185685

ABSTRACT:
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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EDI drawing No. 2SP1032, Dec. 3, 1993.

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