Head box in a paper machine
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United States of America Patent
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-
Jan 21, 1992
Grant Date -
N/A
app pub date -
Oct 26, 1990
filing date -
Oct 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A head box in a paper machine, has a group of conduction pipes for guiding paper material from a mixing chamber into a slice. The pipes are fixed to a frame at one end of the head box on the side of the slice lip. Long portions of the group of conduction pipes, ending at end portions on the side of the mixing chamber, are not fixed to the frame. A perforated plate disposed at an outlet port side of the mixing chamber is also not fixed to the frame, and is connected to the group of conduction pipes. The group of conduction pipes thus freely expand and contract at their non-fixed ends on the side of the perforated plate. The perforated plate is integrally moved following thermal expansion and contraction of the group of conduction pipes, thereby absorbing the thermal expansion and contraction.
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