Deflection compensated forming wire turning bar

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

D - Textiles, Paper

21

F

D21F 9/00 (2006.01) D21F 1/48 (2006.01)

Patent

CA 2095130

A mechanism and method for initially dewatering a paper stock slurry between looped traveling forming wires (10, 11) wherein the wires pass over turning bars (14, 15; 16, 17), controlling the cross-machine curvature of the turning bars to compen- sate 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 (18, 19; 55, 56) for the turning bar such as by providing separate liquid chambers (30, 31; 34, 35) in the beam and directing (18a, 18b, 19a, 19b) heated or cooled water into the chambers to bend the bar to either a positive crown, to be straight or to a negative crown.

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