Head box in a paper machine

Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...

Patent

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Details

162336, D21F 102

Patent

active

050825313

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.

REFERENCES:
patent: 3272233 (1966-09-01), Truffitt
patent: 3528882 (1970-09-01), Nothohm
patent: 3607625 (1971-09-01), Hill et al.
patent: 4146427 (1979-03-01), Hogel et al.

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