Deflection compensated forming wire turning bar

Details Deflection compensated forming wire turning bar Deflection compensated forming wire turning bar

1990-11-13

1992-01-28

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162252, 162301, 162352, D21F 136

Patent

active

050841386

ABSTRACT:
A mechanism and method for initially dewatering a paper stock slurry between looped traveling forming wires wherein the wires pass over turning bars, controlling the cross machine curvature of the turning bars to compensate for variations in curvature due to temperature effects on the turning bar and to control the cross machine curvature of the turning bar to a predetermined fixed shape for wide machines to control the travel of the wire over the bars by applying bending moments to a support beam for the turning bar such as by providing separate liquid chambers in the beam and directing heated or cooled water into the chambers to bend the bar to either a positive crown, to be straight or to a negative crown.

REFERENCES:
patent: 3440136 (1969-04-01), Nelson et al.
patent: 3585105 (1971-06-01), Stuebe
patent: 3746613 (1973-07-01), Vauhkonen
patent: 4124441 (1978-11-01), Nykopp
patent: 4609435 (1986-09-01), Tissari
patent: 4724047 (1988-02-01), Creagan et al.
patent: 4769111 (1988-09-01), Nevalainen et al.

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