Vacuum roll transfer apparatus
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United States of America Patent
Stats
-
Oct 6, 1992
Issued Date -
N/A
app pub date -
Mar 18, 1991
filing date -
Feb 13, 1987
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vacuum roll transfer apparatus is disclosed for drying a web extending through a single tier dryer section of a paper machine. The apparatus includes a rotatable perforate shell having a first and a second end. A stationary duct is disposed within and along the length of the shell between the ends of the shell. The duct is connected to a source of partial vacuum and the shell defines a plurality of holes along the length thereof such that in use of the apparatus, when the duct is connected to the source of partial vacuum, a partial vacuum is generated within a chamber defined between the shell and the duct. A flow restricting arrangement is disposed within the duct for generating a greater vacuum level adjacent to at least one of the ends of the shell for facilitating threading of a tail of the web.
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