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Headbox for a machine for producing a fibrous web

A fiber material and headbox technology, applied in paper machine, wet end of paper machine, textile and paper making, etc., can solve the problem of high consumption of chemical water retaining agent, achieve small pressure loss, reduce consumption and improve stability Effect

Active 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

In addition, a high consumption of chemicals - especially water retaining agents - may also result

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

[0027] figure 1 A vertical and schematic longitudinal section is shown of a headbox 1 for a machine for producing a fibrous material web 3 from a fibrous material suspension 2 (arrow). It goes without saying that the headbox 1 can also be configured as a multi-layered headbox for producing the fibrous material web 3 using at least two different fibrous material suspensions. Here, the fibrous material web 3 can in particular be a paper web, a cardboard web or a cotton paper web.

[0028] The headbox 1 has a conveying device 4 for conveying a fibrous material suspension 2 (arrow). The structure of the conveying device 4 is a transverse distribution pipe 5.1 known to professionals.

[0029] A distribution pipe orifice plate 6 is connected downstream of the conveying device 4, and the distribution pipe orifice plate 6 has channels 7 distributed in rows Z and columns S.

[0030] An intermediate channel 8 extending over the width B (arrow) of the headbox 1 is also connected downstream of ...

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PUM

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Abstract

The invention relates to a headbox (1) which comprises a feed device (4, 5.1; 4, 5.2) 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, 9.1) 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 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.O) and an opening center line (11.M), arriving at different levels and being connected to a common supply channel (12). The headbox further comprises a downstream turbulence generator (13) having a plurality of flow channels (14) arranged in lines (Z) and columns (S) and a headbox nozzle (16) which is directly contiguous to the turbulence generator (13) and which has a nozzle gap (17). The headbox (1) according to the invention has a system pressure loss which is substantially composed of a first pressure loss (Delta p1) between the feed device (4, 5.1; 4, 5.2) and the intermediate channel (8) and a second pressure loss (Delta p2) in the turbulence generator (13), the second pressure loss (Delta p2) and the first pressure loss (Delta p1) being in a ratio ranging from 8:1 to 1:1, preferably from 4:1 to 1:1, particularly from 2:1 to 1:1.

Description

Technical field [0001] The invention relates to a headbox for a machine for producing a web of fibrous material from at least one fibrous material suspension, in particular a web of paper or cardboard, the headbox having: A conveying device for conveying at least one fibrous material suspension; a distribution pipe orifice plate connected downstream and having a large number of channels arranged in rows and columns; a middle of the distribution pipe orifice plate downstream and extending over the width of the headbox Channel, the intermediate channel has a plurality of mechanisms spaced apart from each other in the width direction of the headbox, and the mechanisms are used to input the fluid into at least one fibrous material suspension preferably in an adjustable / controllable manner. In the liquid, each of the mechanisms respectively includes a plurality of metering input channels with corresponding metering input channel openings and opening centerlines, which pass in at diff...

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
Owner VOITH PATENT GMBH
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