Headbox for a machine for producing a fibrous web

A technology of fiber material and headbox, applied in the direction of paper machine, paper making, paper machine wet end, etc., can solve the problems of high pressure loss and achieve the effect of reliable metering input system

Inactive Publication Date: 2011-10-12
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Favorable influences on volume flow constancy: low dynamics at the metering point and high pressure loss after the metering point

Method used

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  • Headbox for a machine for producing a fibrous web
  • Headbox for a machine for producing a fibrous web
  • Headbox for a machine for producing a fibrous web

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] figure 1 Shows a vertical and schematic longitudinal section of an exemplary embodiment of a headbox 1 for a machine for producing at least one fiber material suspension 2 A web of fibrous material 3 is produced. It goes without saying that the headbox 1 can also be configured as a multilayer headbox for producing a fibrous material web 3 using at least two different fibrous material suspensions. Here, the fibrous material web 3 may in particular be a paper web, a cardboard web or a tissue paper web.

[0042] The headbox 1 has a conveying device 4 for conveying one of the fibrous material suspensions 2, said conveying device 4 being implemented in the manner of, for example, a transverse distribution pipe 5 as shown in the figure, or in accordance with a large number of hoses not here. Draw the implementation of the circular distributor.

[0043] Distributor tube perforated plate 6 having a plurality of channels 7 arranged in rows Z and columns S follows downstream o...

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PUM

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Abstract

The invention relates to a headbox (1) for a machine for producing a fibrous web (3), especially a paper or cardboard web, from at least one fiber suspension (2), comprising a feed device (4, 5) feeding the at least one fiber suspension (2), a perforated distribution pipe plate (6) arranged immediately downstream thereof and having a plurality of channels (7) arranged in lines (Z) and columns (S), an intermediate channel (8) arranged downstream thereof, extending over the width (B) of the headbox (1) and having a plurality of means (9) for dosing a fluid (10) in partial fluid streams (10.T) to the at least one fiber suspension (2) in a preferably adjustable/controlled manner, the means (9) being spaced apart from each other in the width direction of the headbox (1) and the individual means (9; 9.1) comprising a plurality of dosing channels (11) having respective dosing channel openings (11.1) on the outlet side and a dosing channel length (11), arriving at different levels and being connected to a common supply channel (12). The headbox (1) according to the invention is characterized in that the dosing channel length (11) of the dosing channel (11) is 1.5 times longer than the dosing channel opening (11.D) of the dosing channel (11) on the outlet side and in that the distance (A) of the dosing channel opening (11.1) of the dosing channel (11) on the outlet side to the turbulence generator (13) ranges from 0 to 50 mm.

Description

technical field [0001] The invention relates to a headbox for a machine for producing a fibrous material web, in particular a paper or cardboard web, from at least one fibrous material suspension, said headbox having: Conveying device for conveying at least one suspension of fibrous material; downstream distribution tube orifice plate with a large number of channels distributed in rows and columns; center located downstream of distribution tube orifice plate and extending over the width of the headbox channel, said central channel has a plurality of means spaced apart from one another in the width direction of the headbox, said means for feeding the fluid into at least one fiber material suspension, preferably in an adjustable / controllable manner in a fluid split metering In the liquid, wherein each said mechanism comprises a plurality of dosing inputs with corresponding openings of the dosing input channel on the outflow side and lengths of the dosing input channel, opening a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F1/02
CPCD21F1/02D21F1/022
Inventor 沃尔夫冈·鲁夫克斯坦丁·芬克尔马库斯·豪斯勒克劳斯·莱利特
Owner VOITH PATENT GMBH
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