Two wire former for paper making machines

Details Two wire former for paper making machines Two wire former for paper making machines

1997-04-22

1998-03-24

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

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

162213, 162301, D21F 100

Patent

active

057308411

ABSTRACT:
A two-wire former for producing a web of fibrous material, in particular a paper web, is designed as a gap-former with the following characteristics: a first and a second wires form together a twin wire; a headbox injects the pulp directly between the two wires; at least one first dewatering zone consists in the advance direction of a curved, non-rotary, interrupted surface, for example a forming shoe or several strips that form together a surface. The invention is characterized in that a convex dewatering element that starts directly at the point of impact of the jet of pulp is provided at the beginning of the first dewatering zone, seen in the advance direction, and has at least two curvature radii Ri in contact with the wires. Both curvature radii Ri are smaller than the curvature radius Ri+l that follows them in the advance direction.

REFERENCES:
patent: 4557802 (1985-12-01), Waris
patent: 4623429 (1986-11-01), Tissari
patent: 4734164 (1988-03-01), Irwin
patent: 5074966 (1991-12-01), Koivuranta
patent: 5203967 (1993-04-01), Bando

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