Paper forming unit with two dandy rolls

Details Paper forming unit with two dandy rolls Paper forming unit with two dandy rolls

1993-02-09

1994-08-16

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162203, 162300, 162348, D21F 100

Patent

active

053384083

ABSTRACT:
In a Fourdrinier paper making system where all of the water from the stock slurry is removed in one direction downwardly through the paper web, a sheet forming unit, including two spaced dandy rolls with a pocket roll inbetween, is added to press a secondary fabric downwardly on the top surface of the paper web. The pocket roll cooperates with a suction box below the paper web to remove water while the web passes over a low vacuum section and then over a high vacuum section and then over a low vacuum section of the suction box. This treatment produces a better internal bond between the fibers in the paper web and also produces better surface properties.

REFERENCES:
patent: 3810818 (1974-05-01), Arledter
patent: 3819474 (1974-06-01), Holz
patent: 4406739 (1983-09-01), Kankaanpaa
patent: 4425187 (1984-01-01), Armstrong
patent: 4459175 (1984-07-01), Bubik et al.
patent: 4472244 (1984-09-01), Haltsonen
patent: 4561938 (1985-12-01), Kallmes

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