Headbox with active local flow control

Details Headbox with active local flow control Headbox with active local flow control

1998-02-24

1999-12-21

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Automatic control

162336, 162343, D21F 106

Patent

active

060044314

ABSTRACT:
A headbox employs flow control valves which modulate the flow of stock through each tube of a tube bank, to give greater control over the cross machine direction flow of stock to the forming section of a papermaking machine. In one approach the flow through the tubes making up the tube bank is controlled by rotating cylindrical valve members which extend into portions of the tubes making up the tube bank. The valve members have channels which align with the tubes when the valve is fully opened. Rotation of the control member obstructs the tubes in the column until the desired level of flow from that column of tubes is obtained. In a second approach, pinch valves are created by constructing part of the tube from an elastic material and using air pressure, a cam or a twisting action to reduce the flow through the elastic section thus creating an adjustable valve. A third method employs guillotine valves which selectively block the flow of stock through a column of tubes.

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patent: 5833808 (1998-11-01), Shands et al.
Shands et al., "Method of Controlling Curl Employing Inline Headbox Edge Control Valve," Patent Application 08/786,626.

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