Method of influencing a pre-drained fibrous web on a screen

Details Method of influencing a pre-drained fibrous web on a screen Method of influencing a pre-drained fibrous web on a screen

1980-11-19

1983-01-25

Alvo, Steve

Paper making and fiber liberation

Processes and products

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

162211, 162217, D21F 152, D21F 304, D21F 306

Patent

active

043702007

ABSTRACT:
A method and apparatus are disclosed for influencing the fibers in the uppermost layer of a fibrous web lying on a screen, for example, in applying a watermark or evening the surface of the web, wherein a surface compression is exerted on the web by a screen roller and a second screen guided around the screen roller. The surface compression is maintained over a variable time period and causes a water film to appear on the upper surface of the web, in which the fiber density is much less than in the web prior to the surface compression. This water layer is forcibly aspirated from the web and the fibers therein thus experience a reorientation and become set in desired positions.

REFERENCES:
patent: 2890149 (1959-06-01), Muller
patent: 2977277 (1961-03-01), Kelly
patent: 3846232 (1974-11-01), Kankaanpaa
patent: 4146424 (1979-03-01), Justus

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