Press felt with asymetric fiber crosssection in a surface layer

Details Press felt with asymetric fiber crosssection in a surface layer Press felt with asymetric fiber crosssection in a surface layer

1989-05-31

1991-01-29

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162DIG1, 428218, 428286, D21F 708

Patent

active

049884093

ABSTRACT:
A press felt (4) is provided for transporting a fibre web (3) through the press section of a paper making machine for efficiently receiving water from the fibre web (3), the press felt (4) includes at least one fabric layer and a surface layer on both sides of the felt (4), the air permeability of both surface layers being substantially smaller than that of all fabric layers. In order to make the removal of water more efficient and to avoid the rewetting of the web, the air permeability of surface layer of the press felt away from the fibre web is substantially smaller than the air permeability of the surface layer on the opposite side of the press felt, i.e., the side adjacent the web.

REFERENCES:
patent: 4199401 (1980-04-01), Liu et al.
patent: 4425392 (1984-01-01), Oikawa et al.
patent: 4529643 (1985-07-01), Lundstrom
patent: 4772504 (1988-09-01), Andresen

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