Process and device for controlling the consistency and fiber ori

Details Process and device for controlling the consistency and fiber ori Process and device for controlling the consistency and fiber ori

1997-08-29

2000-10-24

Chin, Peter

Paper making and fiber liberation

Apparatus

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

162264, 162338, 162343, D21F 102

Patent

active

061361526

ABSTRACT:
A headbox for a paper machine and a process for controlling consistency of the slurry. The headbox includes a turbulence insert having an inlet end and a distributing pipe having a connecting area. The distributing pipe may extend across a width of the paper machine for feeding a slurry flow through the connecting area and into the turbulence insert. The headbox may also include a nozzle having an outlet gap and a plurality of feed lines supplying control flows. The plurality of feed lines may be coupled to the connecting area at an angle .alpha. between approximately 5.degree. and 170.degree. with respect to a directional component of the slurry flow directed toward the turbulence insert, the plurality of feed lines may be positioned in a vicinity of the inlet end. The headbox may further include a device for adjusting the control flows, whereby a consistency of the slurry flow may be adjusted in the vicinity of the inlet end by adjusting the control flows, while a constant volumetric flow of the slurry flow is maintained in the vicinity of the inlet end. The process includes feeding a slurry flow to the headbox across a width of the machine, distributing a plurality of control flows across the width, maintaining a constant rate volumetric flow of the slurry flow, and injecting the plurality of control flows in a vicinity of the turbulence insert at an angle .alpha., between approximately 5.degree. and 170.degree., with respect to a flow component of the slurry flow directed toward the turbulence insert. In this manner, the plurality of control flows may be diverted less than approximately 180.degree. in the distributing pipe to include a flow direction substantially parallel to the slurry flow.

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Copy of a German Search Report dated Feb. 18, 1997 with German Application No. 196 34 993.1.
English Language Translation of European Patent Application No. 95 105 978.1.
Copy of a European Search Report dated Feb. 13, 1998 and Annex.

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