Twin wire forming apparatus

Details Twin wire forming apparatus Twin wire forming apparatus

1987-12-02

1990-01-16

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162203, 162300, D21F 100

Patent

active

048941204

ABSTRACT:
A forming apparatus (10) is disclosed for forming a web from stock. The apparatus (10) includes a frame (14) and a first and second plurality of guide rolls (16-26 and 30-34) rotatably connected to the frame (14). A first and second forming wire (28,36) extend respectively around the first and second plurality of guide rolls, with the first and second wires (28,36) cooperating together to define therebetween, a forming section (38) having a first and second (40,42) end. A headbox (12) is disposed adjacent to the first end (40) of the forming section (38). A suction shoe (44) is disposed adjacent to the first end (40) of the forming section for effecting an initial dewatering of the web. The suction shoe (44) has a curved surface (46) which abuts against the first wire (28) for removing a first portion of the water through the first wire (28) and a second portion of the water through the second wire ( 36). A vacuum slot (52) collects the second portion of water and a roll (17) is disposed between the vacuum slot (52) and the second end (42) of the forming section (38) for removing a third portion of the water from the formed web thereby resulting in a gradual increase in dewatering from the first to the second end of the forming section (38) thereby minimizing removal of fines from the stock and inhibiting two-sidedness of the resultant web.

REFERENCES:
patent: 3438854 (1969-04-01), Means
patent: 3846233 (1974-11-01), Kankaanpaa
patent: 3855057 (1974-12-01), Hill
patent: 4125428 (1978-11-01), Phelps
patent: 4153504 (1979-05-01), Justus
patent: 4209360 (1980-01-01), Stenberg
patent: 4417950 (1983-11-01), Bubik et al.
patent: 4532008 (1985-07-01), Creagan et al.
patent: 4557802 (1985-12-01), Waris
patent: 4609435 (1986-02-01), Tissari

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