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Headbox and sheet-forming unit comprising a headbox

A headbox and forming unit technology, applied in textiles and papermaking, paper machine, wet end of paper machine, etc., can solve problems such as reducing flocculation and regeneration, and achieve the effect of optimizing fiber distribution and filler distribution

Inactive Publication Date: 2012-11-07
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Known measures are not sufficient to suppress or reduce flocculation regeneration to the desired degree at higher material concentrations (for example above 1.0 percent, especially above 1.2 percent) of the fibrous material suspension

Method used

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  • Headbox and sheet-forming unit comprising a headbox
  • Headbox and sheet-forming unit comprising a headbox
  • Headbox and sheet-forming unit comprising a headbox

Examples

Experimental program
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Embodiment Construction

[0039] figure 1 The influence of the material concentration SD of the fiber material suspension FS on the forming is illustrated by means of a graph. With regard to the magnitude of the flocculation FL that is formed as a function of the material concentration SD, the graph illustrates in detail the formation of the flocculation structure in the free jet that results when the fibrous material suspension FS is discharged from the nozzles of the headbox. Thus, the relationship between high material concentration SD and inhomogeneous and indistinct formations due to increased flocculation formation (arrow FL+) in the arrangement of fibers and filler material is evident, that is to say , in conventional, known headboxes there is a tendency for greater flocculation FL in the free jet of the fibrous material suspension to be discharged from the discharge gap of the headbox. Furthermore, it can be seen that when the fibrous material suspension FS has a smaller material concentration...

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PUM

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Abstract

The invention relates to a headbox (1) comprising at least one feeding device (5) feeding at least one fibrous material suspension (FS), a nozzle (4) having an outlet gap (11) for dispensing the fibrous material suspension (FS) in a free jet to a downstream functional unit of a shaping unit (2) downstream of the headbox (1) and a turbulence-generating device (6) arranged directly upstream of the nozzle (4) in the flow direction. The headbox further comprises a plurality of turbulence-generating channels (7, 7.xy, 7.11 - 7.4n) having at least one fluidization region each for guiding the fibrous material suspension (FS) in partial flows and supplying the nozzle (4), the individual channels (7, 7.xy, 7.11 -7.4n) being arranged in parallel to each other, forming rows (R1-Rx, R1-R4), in the transversal direction of the turbulence-generating device (6), and the rows (R1-Rx, R1-R4) being arranged next or on top of each other at a right angle to the transversal direction. The headbox (1) according to the invention is characterized in that the portion of a row (R1-Rx, R1-R4) of turbulence-generating channels (7, 7.xy, 7.11 -7.4n) supplying the nozzle (4) across a predefined unit of length at a right angle to the direction of throughflow forms a hydraulic unit (EH) and in that the nozzle (4) and the turbulence-generating device (6) are designed such that the volume which is referred to as volume (V hydr.unit) of the hydraulic unit and which is supplied by an individual hydraulic unit (EH) has a discharge width <=0.005 m<3> / m.

Description

technical field [0001] The invention relates to a headbox with: at least one feed device for feeding at least one fiber material suspension; a nozzle with a discharge gap for feeding the fiber material suspension with a free jet to a subsequent, On the functional unit of the molding unit, the molding unit is arranged after the headbox; and the vortex generating device arranged directly in front of the nozzle in the flow direction has a large number of vortex-generating channels with at least one fluidization area, said channel For guiding a fiber material suspension in sub-flows and loading nozzles, wherein in the transverse direction of the vortex generating device the individual channels are arranged parallel to one another and configured in rows, and the rows are arranged perpendicularly to the transverse direction next to each other or one above the other ground layout. [0002] Furthermore, the invention relates to a page forming unit of a machine for producing webs of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F1/02
CPCD21F1/026D21F1/028D21F1/02
Inventor 汉斯·洛泽马库斯·豪斯勒沃尔夫冈·鲁夫
Owner VOITH PATENT GMBH