Differential pressure sealing apparatus and method
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United States of America Patent
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Mar 9, 1993
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N/A
app pub date -
Sep 26, 1990
filing date -
May 20, 1987
priority date (Note) -
Expired
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Abstract
A differential pressure sealing apparatus and method for processing a continuously moving elongated sheet through successively different stages of vacuum. A vacuum chamber is provided with an inlet and a guide roller for the incoming sheet with the sheet urged against the guide roller over a wrap contact angle of 15 to 120 degrees. To resist the entrance of air into the chamber, a sealing structure encompasses at least portions of the entrance, the guide roller and the sheet.
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