EP2454411A1 - Caisse de tête pour une machine de fabrication d une bande de matière fibreuse - Google Patents

Caisse de tête pour une machine de fabrication d une bande de matière fibreuse

Info

Publication number
EP2454411A1
EP2454411A1 EP10724332A EP10724332A EP2454411A1 EP 2454411 A1 EP2454411 A1 EP 2454411A1 EP 10724332 A EP10724332 A EP 10724332A EP 10724332 A EP10724332 A EP 10724332A EP 2454411 A1 EP2454411 A1 EP 2454411A1
Authority
EP
European Patent Office
Prior art keywords
headbox
metering
fluid
generating means
turbulence generating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10724332A
Other languages
German (de)
English (en)
Inventor
Wolfgang Ruf
Frank Fey
Markus Häußler
Ole Hansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2454411A1 publication Critical patent/EP2454411A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/024—Details of the feed chamber

Definitions

  • Headbox for a machine for producing a fibrous web
  • the invention relates to a headbox for a machine for producing a fibrous web, in particular a paper, board or tissue web, from at least one pulp suspension, with a feed device feeding at least one pulp suspension, with one immediately after the feeder in the flow direction of the at least one pulp suspension and a plurality of distributed in rows and in columns flow channels distribution tube plate, with one of the Verteil- perforated plate in the flow direction of at least one pulp suspension immediately adjoining, extending in the direction of the headbox and two preferably machine-wide walls having intermediate channel, with a Interchannel in the flow direction of the at least one pulp suspension immediately subsequent turbulence generating means having a plurality of arranged in rows and in columns flow control channels, and having a headbox nozzle immediately adjacent to the turbulence generating means in the flow direction of the at least one pulp suspension, wherein the feeder, the distribution well plate and the intermediate channel are arranged in a first alignment plane and the turbulence generating means and the headbox nozzle in a second alignment plane and wherein the two plane
  • Such a headbox has been known in the art for many years and is described, for example, by the company Voith Paper under the name "W It is preferably used in paper or board machines with a forming unit comprising a fourdrinier wire, so-called Fourdrinier developments on the headbox of machines for producing a fibrous web have led, in addition to the actual pulp suspension, which is required for the production of the fibrous web, an additional controlled metered addition of a fluid, such as water or pulp suspension with different consistency, in the art short called “dilution water” occurs. This admixing takes place at several points distributed over the width of the headbox. The amount and / or the property of the dilution water are adjustable. By this measure, for example, the basis weight cross profile can be controlled efficiently and / or the occurrence of cross flows in the headbox can be effectively prevented.
  • Such a headbox with the described dilution water technology is known, for example, from the document DE 41 19 593 C2 ("ModuleJet")
  • ModuleJet The preferably controllable metered addition of the dilution water in partial streams into the at least one pulp suspension takes place through inlet openings in the wall of the In order to limit the effect of the added dilution water locally, in some cases partitions are placed in the mixing chamber.
  • Such a headbox with the described dilution water technology may also be equipped with an alternative dilution water system such as "Jetco”, “Annular Slot Injection” or “Injection System.”
  • dilution water systems from reputable manufacturers of fiber web production machines are systems, the requirements for a good mixing of pulp suspension and dilution water, a sufficient volume flow constancy, a small effective width and a low mapping offset more or less good or only partially meet.
  • a headbox of the type mentioned in the present invention that at least one preferably machine-wide wall of the intermediate channel spaced apart both in the width direction and in the longitudinal direction of the headbox means for preferably controllable metered addition of a fluid in partial fluid streams in the at least one fibrous suspension are arranged such that the individual means for preferably controllable metered addition of the fluid into at least one fluid sub-stream into the at least one fibrous suspension has a metering channel opening and a metering channel centreline having metering and that the respective Zudosierkanalö Publishing the Zudosierkanals of the individual means for preferably controllable / metered metered addition of the fluid in at least one partial fluid stream in the at least one pulp suspension is aligned so that the Zudosierkanstofflinein this Zudosierka- nals impinges on the turbulence generating means at a point of impingement.
  • the turbulence generating means is preferably a turbulence generator known to
  • the inventive improvement of the headbox of the type mentioned allows the realization of a technically simple and reliable dilution water system. Even with dilution water or fluid quantities that are possibly very different locally, good volume flow constancy is achieved over the entire machine width and, due to the addition of the dilution water or fluid in the direct intake region of the turbulence generation means, a narrow and sharply delineated active response is produced in the fibrous web.
  • a "vagrancy" of the partial flow of dilution water or fluid can only take place to a very limited extent by the targeted, locally stable and preferably controllable addition of the dilution water or of the fluid and the intensive mixing in the flow channels of the flow channel following the metering region Turbulence generating means with separate guidance of the mixed streams up to the beginning of the headbox out so the requirements for an optimal dilution water system largely, preferably even completely met.
  • the inventive improvement of the headbox of the type mentioned is suitable as a cheaper retrofit solution with less downtime compared with the already known retrofit solutions.
  • only at least one wall of the intermediate channel with the means for preferably tax- / rule ble metering of the dilution water or Fluids are provided in partial streams in the at least one pulp suspension.
  • the other components and groups of the previous headbox can exist without any structural changes and thus continue to be used.
  • the inventive improvement of the headbox of the type mentioned can be completed problem and effortlessly in the local environment of the existing machine for producing a fibrous web.
  • the respective metering channel opening of the metering channel of the individual means for preferably controllable metered addition of the fluid in at least one partial fluid stream into the at least one fibrous suspension is oriented such that the metering channel center line of this metering channel is preferably approximately central, in particular central between the columns of two adjacent flow channels impinging on the turbulence generating means upon formation of a point of impact.
  • the metered partial fluid flow does not flow directly into at least one flow channel of the turbulence generating means, very stable conditions with regard to the volume flow constancy are achieved. Moreover, water jet pump effects and similar phenomena are avoided to the greatest possible extent and lead to only slight changes in the case of changing volumes of the partial fluid flows.
  • a further preferred embodiment provides that the flow channels arranged in one row of the turbulence generating means have a line division of the flow channels and that the metering channel center lines of the Zudo- sierkanäle the spaced in the width direction of the headbox means for preferably controllable rule metered addition of the fluid in fluid partially dividing into the at least one pulp suspension associated with the flow channels of the turbulence generating means arranged in this row, having a line pitch of the metering passage centerlines, the line spacing of the metering passage centerlines preferably assuming the same or double the line splitting of the flow channels.
  • the line division of the metering channel centerlines assumes twice the line splitting of the flow channels, only one line of metering channels is assigned to each second row of flow channels.
  • the line division of the flow channels may, for example, assume a value of 25, 33, 50, 66 or 100 mm
  • a further preferred embodiment provides that the respective metering channel opening of the metering channel of the individual means for preferably controllable metered addition of the fluid in at least one partial fluid stream into the at least one pulp suspension is aligned such that the metering channel centerline of this metering channel outside or inside the Line of adjacent flow channels impinges on the turbulence generating means forming a point of impact.
  • the out-of-phase impact of the metering channel center line can assume a value of up to 50% of the column pitch of the flow channels.
  • the effective impact surface can be effectively increased, so that once again very stable conditions with regard to the volume flow constancy are achieved.
  • the metering channel centerline of the metering channel may also impinge upon the turbulence generating means within the line of adjacent flow channels as the point of impact is formed.
  • the point of impact of the metering channel centerline of the metering channel of the agent then aligns with the two adjacent flow channels of the turbulence generating means.
  • the flow channels arranged in a column of the turbulence generating means have a column pitch of the flow channels and the Zudosierkanalffenlinien the emanating at different heights Zudosierkanäle the means for preferably controllable / metered metered addition of the fluid in partial fluid streams in the at least one pulp suspension, the in this column arranged column flow channels of the turbulence generating means, a column pitch of the Zudosierkanalffenlinen, wherein the column pitch of Zudosierkanalffenlinien can assume the same or double value of the column pitch of the flow channels. If the two column divisions now assume the same value, each column of flow channels is assigned exactly one column of metering channels. On the other hand, if the column pitch of the metering channel center lines assumes twice the value of the column pitch of the flow channels, then only every second column of flow channels is assigned a column of metering channels.
  • the respective metering channel opening of the metering channel of the individual means for preferably controllable metered addition of the fluid in at least one partial fluid stream into the at least one fibrous suspension can, of course, also be oriented so that the metering channel centerline of this metering channel is centered or approximately centered, optionally also slightly offset to one Flow channel of the turbulence generating means impinges upon formation of a point of impact.
  • the flow channels of the turbulence generating means arranged in two adjacent rows can be offset relative to one another, preferably offset from one another in the middle.
  • the distance between the flow channels of the turbulence generating means arranged in adjacent rows is markedly increased. And this in turn leads to an advantageous increase in the effective impact area, so that in turn very stable conditions in terms of volume flow constancy are achieved.
  • flow channels of the turbulence generating means may of course be arranged without offset from each other. This results in a rectangular array grid for the flow channels of the turbulence generating means.
  • the metering channels of the means arranged in a column for preferably controllable metered addition of the fluid in partial fluid streams into the at least one pulp suspension are connected to a common supply channel.
  • each metering channel of the individual means for preferably controllable metered addition of the fluid in fluid sub-streams into the at least one pulp suspension is connected to its own supply channel.
  • This technically more complex design provides the advantage of greater design options, especially during operation of the machine for producing a fibrous web.
  • the respective Zudosierkanalö Stamm the Zudosierkanals of the individual means for preferably controllable rule metered addition of the fluid in at least one partial fluid stream in the at least one fibrous suspension to the turbulence generating means preferably a vertical and equal or approximately equal distance in the range of 1 to 50 mm, preferably from 3 to 30 mm, in particular from 10 to 30 mm.
  • This provides the advantage of a space-saving design with aerodynamically and technologically optimal operating conditions of the machine for producing a fibrous web.
  • the respective metering channel of the means for the preferably controllable metered addition of the fluid into at least one fluid partial stream into the at least one fibrous suspension may at least in some areas have a constant or preferably an abruptly widening cross-sectional inner surface. This can improve the distribution in the z direction.
  • the respective means for preferably controllable metered addition of the fluid in at least one partial stream of fluid into the at least one pulp suspension preferably comprises a metering tube.
  • This form of the agent has aerodynamically optimal properties and is also particularly suitable under production aspects.
  • the metering tube can in this case have any known tube cross-section, namely round, approximately round, oval, triangular, rectangular, square and the like.
  • the respective metering channel of the metering tube can have a rotationally symmetrical cross-sectional inner surface along its metering channel center line and the individual metering tube can have a preferably rotationally symmetrical outer surface with a diameter in the range from 3 to 25 mm, preferably from 4 to 16 mm, in particular from 5 to 10 mm, exhibit.
  • the fluidic properties of the agent can be further improved.
  • the fluid preferably consists of water, in particular clear water, or of a pulp suspension, in particular white water, the concentration of which differs from the average concentration of the at least one fibrous suspension flowing in the headbox.
  • the headbox according to the invention is outstandingly suitable for use in a machine for producing a fibrous web, in particular a paper, board or tissue web.
  • the fibrous web produced in the machine with at least one headbox according to the invention has consistently excellent properties, since, among other things, the control of both its fiber orientation transverse profile and its basis weight cross-section is possible. Further features and advantages of the invention will become apparent from the following description of several preferred embodiments with reference to the drawings. Show it
  • Figure 1 is a vertical and schematic longitudinal sectional view of a
  • Figure 2 is a partial and schematic sectional view of a first embodiment of a headbox according to the invention for a machine for producing a fibrous web;
  • Figure 3 is a partial and schematic sectional view of a second embodiment of a head box according to the invention for a machine for producing a fibrous web;
  • Figure 4 is an illustration of a first Zudosierrich a headbox according to the invention for a machine for producing a fibrous web
  • FIG. 5 is an illustration of a second metering concept of a head box according to the invention for a machine for producing a fibrous web.
  • the shown headbox 1 shows a vertical and schematic longitudinal section of an exemplary embodiment of a headbox 1 for a machine for producing a fibrous web 3 from a pulp suspension 2.
  • the shown headbox 1 can of course also be designed as a multi-layer waste containing at least two different pulp suspensions used for the production of the fibrous web 3.
  • the fibrous web 3 may in particular be a paper, board or tissue web.
  • the headbox 1 has a feeding device 4 which feeds the pulp suspension 2, for example in the embodiment of an illustrated transverse dividing pipe 5 or a rotary distributor, not shown, with a plurality of hoses, on.
  • the feed device 4 closes in the flow direction R (arrow) of the pulp suspension 2 directly a, for example, three-line distribution well plate
  • the number of lines Z can also be less than or greater than three in a manner not shown.
  • a three-line turbulence generating means 10 with a plurality of in three rows Z and in several columns S arranged flow channels 11 (see Figures 4 and 5).
  • the number of lines Z can also be less than or greater than three in a manner not shown.
  • the pulp suspension 2 in the turbulence generating means 10 is divided into pulp suspension partial streams and, after exiting the turbulence generating means 10 in a machine-wide chamber 12 in a form of a nozzle gap 14 having headbox 13 again combined to form a machine-wide fibrous web 3 to allow.
  • the flow channels 6 of the turbulence generating means 10 are preferably formed in a known manner as thin-walled turbulence tubes and / or turbulence tube inserts with at least partially constant, at least partially diverging, at least partially converging and / or discontinuous cross-sectional inner surfaces.
  • the headbox 13 is optionally optionally provided on the outlet side with at least one aperture 15 indicated by dashed lines.
  • separating element in particular a blade be arranged. If a plurality of separating elements, in particular lamellae, are arranged in the headbox nozzle 13, they can have different lengths and possibly also different properties, such as surface contours and the like.
  • the feed device 4, the distribution well plate 6 and the intermediate channel 8 in a first orientation plane AE.1 and the turbulence generating means 10 and the headbox 13 are arranged in a second alignment plane AE.2.
  • the two alignment planes AE.1, AE.2 include an obtuse angle ⁇ in the range of> 90 and ⁇ 180 °, preferably of> 100 and ⁇ 170 °, in particular of> 110 and ⁇ 160 °.
  • the headbox 1 thus has a substantial deflection 16.
  • 2 shows a partial and schematic sectional view of a first embodiment of a headbox 1 according to the invention for a machine for producing a fibrous web from a pulp suspension 2 (arrow). The illustrated extract is indicated in the figure 1 with a dashed circle K.
  • the basic structure of this headbox substantially corresponds to the basic structure of the headbox 1 shown schematically in FIG. 1, so that reference is also made to this description of the figures.
  • the intermediate channel 8 is arranged in a first orientation plane AE.1 and the turbulence generation means 10 is arranged in a second alignment plane AE.2.
  • the two alignment planes AE.1, AE.2 include an obtuse angle ⁇ in the range of> 90 and ⁇ 180 °, preferably of> 100 and ⁇ 170 °, in particular of> 1 10 and ⁇ 160 °.
  • the headbox 1 thus has a substantial deflection 16.
  • the intermediate channel 8 On the upper and preferably machine-wide wall 9.2 of the intermediate channel 8 are several both in the width direction B (arrow) and in the longitudinal direction L (arrow) of the headbox 1 spaced-apart means 17 for preferably controllable / rule ble metering of a fluid 18 in partial fluid streams 18th T (arrows) in the pulp suspension 2 (arrow) arranged. Due to the metered addition of the fluid 18 (arrow) in partial fluid streams 18.T (arrow) into the pulp suspension 2 (arrow), mixed partial flows 2.1 (arrow) result, which are then combined in the headbox nozzle into a combined mixed flow.
  • the means for preferably controllable metered addition of the fluid 18 in partial fluid flows 18.T (arrow), such as valves, are well known to those skilled in the art and thus not explicitly shown.
  • the respective metering channel 19 of the metering tube 17.1 has a rotationally symmetrical cross-sectional inner surface along its metering channel center line 19.M
  • the individual metering tube 17.1 also has a preferably rotational symmetrical outer surface 19.A with a diameter 19.D in the range of 3 to 25 mm, preferably from 4 to 16 mm, in particular from 5 to 10 mm, on.
  • the respective metering channel 19 of the means 17 has, at least in regions, a constant or preferably transversely widening cross-sectional inner surface 19.
  • the supply channel 20 is in turn connected to a supply system, not shown, for the fluid 18, wherein preferably in the supply channel 20 and / or in the supply system known in the art and thus not explicitly shown means, such as a valve for controllable / metered addition of the fluid 18 arrow is present.
  • a supply system not shown
  • means such as a valve for controllable / metered addition of the fluid 18 arrow is present.
  • each Zudosierkanal the individual means for preferably controllable / controllable metered addition of the fluid in partial fluid streams in the at least one pulp suspension in a manner not shown may also be connected to its own supply channel.
  • the metering channel opening 19.1 of the respective metering channel 19 of the individual means 17 is therefore arranged parallel or approximately parallel to the inlet side 10.
  • it may also be arranged in a manner not shown at an angle to the inlet side of the turbulence generating means.
  • FIG. 3 shows a partial and schematic sectional view of a second embodiment of a headbox 1 according to the invention for a machine for producing a fibrous web from a fibrous stock suspension 2 (arrow).
  • the illustrated extract is indicated in the figure 1 with a dashed circle K.
  • the intermediate channel 8 is arranged in a first orientation plane AE.1 and the turbulence generation means 10 is arranged in a second alignment plane AE.2.
  • the two alignment planes AE.1, AE.2 include an obtuse angle ⁇ in the range of> 90 and ⁇ 180 °, preferably of> 100 and ⁇ 170 °, in particular of> 110 and ⁇ 160 °.
  • the headbox 1 thus has a substantial deflection 16.
  • the means for preferably controllable metered addition of the fluid 18 in partial fluid flows 18.T (arrow), such as valves, are well known to those skilled in the art and thus not explicitly shown.
  • the respective metering channel 19 of the metering tube 17.1 has a rotationally symmetrical cross-sectional inner surface 19.1 along its metering channel center line 19.M.
  • the individual metering tube 17.1 further has a preferably rotationally symmetrical outer surface 19.A with a diameter 19.D in the range of 3 to 25 mm, preferably from 4 to 16 mm, in particular from 5 to 10 mm.
  • the respective metering channel 19 of the means 17 has, at least in regions, a constant or preferably transversely widening cross-sectional inner surface 19.1.
  • the respective metering channel opening 19.1 of the metering channel 19 of the individual means 17 for preferably controllable metering of the fluid 18 in at least one partial fluid flow 18.T (arrow) into the at least one fibrous material Suspension 2 is oriented so that the metering channel centerline 19.M of this metering channel 19 impinges on the turbulence generating means 10 when a point of impact AP (cross) is formed.
  • the Zudosierkanäle 19 are arranged in a column S means
  • each Zudosierkanal the individual means for preferably controllable / rule ble metering of the fluid in partial fluid streams in the at least one pulp suspension in a manner not shown may also be connected to its own supply channel.
  • FIG. 4 and 5 show two metering concepts of a headbox 1 according to the invention for a machine for producing a fibrous web.
  • the flow channels 11 of the turbulence generating means 10 are arranged by way of example in three rows Z.1 to Z.3 (Z) and four meander-shaped columns S.1 to S.4 (S).
  • flow channels 11 of the turbulence generating means 10 are arranged offset to one another. In the two present representations they are arranged centrally offset from one another, so that the flow channels 1 1 of the lower line Z.1 and the flow channels 11 of the upper line Z.3 have the same arrangement in width directions B (double arrow) of the headbox 1.
  • the flow channels of the turbulence generating means arranged in two adjacent rows can, of course, also be arranged without offset relative to one another in a manner not shown. This results in a rectangular array grid for the flow channels of the turbulence generating means.
  • Zudosierkanalö Stamm 19.1 of Zudosierkanäle 19 are shown in dashed lines and designed as a metering 17.1 means 17 for preferably controllable / rule ble metering of the fluid in partial fluid streams in the at least one pulp suspension shown.
  • the individual metering channel opening 19.1 of the metering channel 19 of the means 17 is aligned such that the metering channel center line 19.M of each metering channel 19 of the means 17 approximately centrally, in particular centrally between the columns S.2 and S.3 two adjacent flow channels 11 on the turbulence generating means 10th impinges upon formation of a respective impact point AP.
  • the flow channels 11 of the turbulence generation means 10 arranged in a row Z.1, Z.2 and Z.3 have a line division of the flow channels. Nodes TZ.11.
  • the line division of the flow channels may, for example, assume a value of 25, 33, 50, 66 or 100 mm.
  • the Zudosierkanalffenlinien 19.M the Zudosierkanäle 19 of the width direction B (arrow) of the headbox 1 spaced-apart means 17 which are assigned to the arranged in this row Z.1, Z.2 and Z.3 flow channels 1 1 of the turbulence generating means 10 have a line division of the Zuzosierkanal Mittellienien TZ.19.M on.
  • the line division of the metering channel center lines TZ.19.M assumes twice the value of the line division of the flow channels TZ.1 1.
  • the two line divisions TZ.19.M and TZ.11 can also assume the same value.
  • the flow channels 11 of the turbulence generating means 10 arranged in a column S.2 and S.3 have a column pitch of the flow channels TS.11.
  • the Zudosierkanalstofflinien 19.M the opening at different heights Zudosierkanäle 19 of the means 17, which are assigned to the arranged in this column S.2 and S.3 flow channels 1 1 of the turbulence generating means 10, have a column pitch of Zudosierkanalstofflinien TS.19. M up.
  • the column pitch of the metering channel center lines TS.19.M assumes the same value of the column pitch of the flow channels TS.11.
  • all rows Z.1, Z.2 and Z.3 of flow channels 11 of the turbulence generating means 10 are each assigned a row of metering channels 19 of the means 17.
  • the whole amount of pulp suspension is supplied with the fluid in partial fluid streams.
  • the column pitch of Zudosierkanalstofflinien TS.19.M takes twice the value of the column pitch of the flow channels TS.11.
  • the rows Z.1 and Z.3 of the flow channels 1 1 of the turbulence generating means 10 are each assigned a row of metering channels 19 of the means 17.
  • the individual Zudosierkanalö réelle 19.1 of Zudosierkanals 19 of the means 7 in Figures 4 and 5 is aligned so that the Zudosierkanstofflinem 19.M this Zudosierkanals 19 outside the line Z.1, Z.2 and Z.3 ( Figure 4) or Z.1 and Z.3 ( Figure 5) of the adjacent flow channels 11 impinging on the turbulence generating means 10 in forming the impact point AP.
  • the metering channel centerline of the metering channel may impinge upon the turbulence generating means as the point of impingement forms within the line of the adjacent flow channels in a manner not shown.
  • the fluid 18 used in the embodiments of FIGS. 2, 3, 4 and 5 consists at least of water, in particular white water or clear water, or of at least one pulp suspension whose concentration is determined by the average concentration of the at least one pulp suspension 2 flowing in the headbox 1 (FIG. Arrow).
  • the headbox 1 shown and described in each case in Figures 2, 3, 4 and 5 is particularly suitable for use in a machine for producing a fibrous web 3, in particular a paper or board web, from at least one pulp suspension 2 (arrow).
  • the features of the headbox 1 illustrated and described in FIGS. 2, 3, 4 and 5 may also be at least partially combined with one another by the skilled person in a manner which is obvious.
  • a headbox of the type mentioned is improved by the invention so that a technically simple and reliable dilution water system can be realized. Moreover, he allows a cost effective design and represents a cheaper retrofit solution with less downtime.
  • 17 means for preferably controllable rule metered addition of a fluid in fluid sub-streams

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Abstract

L’invention concerne une caisse de tête pour une machine de fabrication d’une bande de matière fibreuse à partir d’une suspension de matière fibreuse. La caisse de tête comprend un dispositif d’amenée (4, 5) qui achemine la suspension de matière fibreuse, une plaque perforée de tuyau de répartition (6) raccordée directement au dispositif d’amenée dans la direction d’écoulement de la suspension de matière fibreuse, un canal intermédiaire (8) raccordé directement à la plaque perforée de tuyau de répartition dans la direction d’écoulement et présentant deux parois (9.1, 9.2), un moyen générateur de turbulence (10) raccordé directement au canal intermédiaire dans la direction d’écoulement, ainsi qu’une buse de caisse de tête (13) raccordée directement au moyen générateur de turbulence dans la direction d’écoulement. Le dispositif d’amenée, la plaque perforée de tuyau de répartition et le canal intermédiaire sont agencés dans un premier plan d’orientation (AE.1), tandis que le moyen générateur de turbulence et la buse de caisse de tête sont agencés dans un second plan d’orientation (AE.2), les deux plans d’orientation formant un angle (α) > 90 et < 180°. La caisse de tête selon l’invention est caractérisée en ce que plusieurs moyens (17, 17.1) positionnés à une certaine distance les uns des autres aussi bien dans le sens de la largeur que dans le sens de la longueur de la caisse de tête, destinés à ajouter un fluide (18) de manière dosée, sous la forme de flux partiels de fluide (18.T), dans la suspension de matière fibreuse, sont agencés sur au moins une paroi (9.2) du canal intermédiaire (8). En outre, la caisse de tête est caractérisée en ce que le moyen individuel (17,17.1) comprend un canal d’addition dosée (19) présentant une ouverture de canal d’addition dosée (19.1) et une ligne médiane de canal d’addition dosée (19.M) et en ce que l’ouverture de canal d’addition dosée respective du canal d’addition dosée est conçue de telle sorte que la ligne médiane de canal d’addition dosée de ce canal d’addition dosée vienne buter contre le moyen générateur de turbulence, formant ainsi un point d’impact (AP).
EP10724332A 2009-07-15 2010-05-06 Caisse de tête pour une machine de fabrication d une bande de matière fibreuse Withdrawn EP2454411A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009027721A DE102009027721A1 (de) 2009-07-15 2009-07-15 Stoffauflauf für eine Maschine zur Herstellung einer Fasterstoffbahn
PCT/EP2010/056135 WO2011006691A1 (fr) 2009-07-15 2010-05-06 Caisse de tête pour une machine de fabrication d’une bande de matière fibreuse

Publications (1)

Publication Number Publication Date
EP2454411A1 true EP2454411A1 (fr) 2012-05-23

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EP10724332A Withdrawn EP2454411A1 (fr) 2009-07-15 2010-05-06 Caisse de tête pour une machine de fabrication d une bande de matière fibreuse

Country Status (5)

Country Link
US (1) US20120168105A1 (fr)
EP (1) EP2454411A1 (fr)
CN (1) CN102472009A (fr)
DE (1) DE102009027721A1 (fr)
WO (1) WO2011006691A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010001557A1 (de) 2010-02-03 2011-08-04 Voith Patent GmbH, 89522 Ventil zum Regulieren eines Fluidstroms
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DE102009027721A1 (de) 2011-01-20
US20120168105A1 (en) 2012-07-05
CN102472009A (zh) 2012-05-23

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