Dual-chamber vacuum box
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Feb 1, 1995
filing date -
Feb 1, 1995
priority date (Note) -
Expired
status (Latency Note)
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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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