EP2379799B1 - Caisson de tête pour machine de fabrication d'une bande de matière fibreuse - Google Patents

Caisson de tête pour machine de fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP2379799B1
EP2379799B1 EP09740124A EP09740124A EP2379799B1 EP 2379799 B1 EP2379799 B1 EP 2379799B1 EP 09740124 A EP09740124 A EP 09740124A EP 09740124 A EP09740124 A EP 09740124A EP 2379799 B1 EP2379799 B1 EP 2379799B1
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EP
European Patent Office
Prior art keywords
metering
headbox
channel
fluid
fibrous suspension
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.)
Not-in-force
Application number
EP09740124A
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German (de)
English (en)
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EP2379799A1 (fr
Inventor
Wolfgang Ruf
Konstantin Fenkl
Markus Häußler
Klaus Lehleiter
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2379799A1 publication Critical patent/EP2379799A1/fr
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Publication of EP2379799B1 publication Critical patent/EP2379799B1/fr
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    • 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

Definitions

  • the invention relates to a headbox for a machine for producing a fibrous web, in particular paper or board web, from at least one pulp suspension, comprising a feeding device feeding the at least one pulp suspension, having a downstream and a plurality of channels arranged in rows and in columns A distribution well plate having a downstream thereto, over the width of the headbox extending intermediate channel with a plurality of spaced in the width direction of the headbox means for preferably controllable / metered addition of a fluid in fluid streams in the at least one pulp suspension, wherein the single means each have a plurality comprising respective outlet-side Zudosierkanalö Stamm and Zudosierkanalfar comprising, at different heights and connected to a common supply channel Zudosierkanäle, with a current Downstream turbulence generating means having a plurality of flow channels arranged in rows and in columns and with a headbox jet immediately adjacent to the turbulence generating means and having a nozzle gap.
  • Such a headbox is for example from the German patents DE 44 16 898 A1 .
  • German patent application DE 44 16 898 A1 shows a headbox for a paper machine with a supply device for the pulp suspension, with a plurality of channels having guide means, one upstream lying to a guide means mixing chamber with a plurality of distributed across the headbox feeding means for a differing in its properties of the stock suspension zuzumischendes and with the guide means subsequent, an outlet gap for the stock suspension forming nozzle chamber.
  • the feed means for the admixed fluid extend substantially perpendicularly in the mixing chamber and have a plurality of admixing openings located one above the other.
  • German disclosure DE 44 16 899 A1 shows a headbox for a paper machine with a supply device for the pulp suspension, a first plurality of channels having guide means, a second plurality of channels having guide means, an intermediate mixing chamber, a subsequent, an exit slit for the stock suspension forming nozzle chamber and a plurality of transverse over the headbox distributed supply lines for the admixed fluid, wherein the majority of the channels of the guide means are positioned and dimensioned so that the outlet opening from the upstream guide means is not aligned with an opening in the downstream guide means.
  • the supply lines for the admixing fluid have admixing openings, which for the most part are each aligned with an opening in the downstream guide device.
  • German Offenlegungsschrift DE 44 16 909 A1 a headbox for a papermaking machine having a stock suspension feeder, downstream guide means provided with a plurality of channels, downstream of which is a mixing chamber extending across the width of the headbox with a plurality of crossflow wells distributed substantially across the headbox, substantially in the flow direction extending partitions and distributed across the headbox feeders for a zuzumischendes fluid with Zumischö réelleen, downstream of a further, a plurality of channels having guide means and a subsequent, an outlet gap for the stock suspension forming nozzle chamber.
  • the supply means for the admixed fluid extend into the mixing chamber and the sectional area formed by the partitions in the mixing chamber begins in the region of the admixing openings, from where it extends substantially in the direction of flow up to the second guide means.
  • a headbox of a paper machine with a feed device for the pulp suspension is a with a plurality of channels having guide means, a lying upstream of a guide means mixing chamber with a plurality of transversely distributed over the course feed means for a differing in its properties of the stock suspension zuzumischendes and with the guide means subsequent, an exit gap for equipped with the pulp-forming nozzle space.
  • the feed device is designed as a tube inserted into the mixing chamber, which have in the mixing chamber a plurality of substantially perpendicular to the main flow direction admixing
  • From the DE 102 45 154 A1 is a headbox for a paper or board machine with at least one mixing chamber known.
  • a first fluid flows into the mixing chamber and at least a second fluid is added via metering channels which open at least partially at different heights.
  • the metering channels for the second fluid are at least partially provided in at least one metering blade introduced into the mixing chamber.
  • the headboxes shown in these documents form systems that meet the particular technological requirements for a good mixing quality of pulp suspension and fluid, a sufficient volume flow stability, a small effective width and a low mapping offset more or less good or only partially meet.
  • the mixing quality of pulp suspension and fluid is usually by a good pre-distribution of the media in the height direction, positively influenced by a large turbulence intensity in the media and by a long mixing distance for the media.
  • a low dynamics at the metering point and a high pressure loss after the metering point have a favorable effect.
  • the inventive design of the headbox of the type mentioned provides a most extensive, preferably complete avoidance of the disadvantages of the prior art and a much improved fulfillment of particular technological requirements.
  • the headbox according to the invention has a technically simple and reliable Zudosiersystem, which is also still inexpensive and technically easy to perform.
  • the stated arrangement of Zudosierkanäle over the height and the dimensioning of the respective Zudosierkanals affect extremely positive to the required good to very good mixing quality of pulp suspension and fluid, the desired low effective width and the necessary low mapping offset.
  • At least one, well-known to those skilled separator, in particular a blade be arranged. If several separating elements, in particular slats arranged in the headbox of the head box according to the invention so they can have different lengths and possibly also different properties, such as surface contours and the like.
  • the means designed in particular as a metering blade for preferably controllable metering of the fluid in partial fluid streams into the at least one pulp suspension is preferably arranged on the lower wall and / or on the upper wall of the intermediate channel.
  • This embodiment is particularly useful in high-line turbulence generating means to limit the Fluidzuström füren in the individual fluid supply line.
  • the two walls of the intermediate channel may be at least partially parallel to each other, convergent, divergent, stepped or spherically curved and arranged.
  • the arrangement of the means for preferably controllable metered addition in at least one row is also possible. If the means for preferably regulatable / controllable metering are arranged in several rows, then they can also be arranged offset from one another.
  • the means which is designed in particular as a metering blade, for metering preferably controllable metering can be made of at least one metal, such as a stainless steel, titanium or bronze, or a plastic, such as a thermosetting plastic, of a thermoplastic a (hard) rubber, made of a fiberglass, a CFK or the like consist.
  • a plastic version in particular the materials polyamide (PA), polyphenylsulfone (PPSU), Teflon (PTFE), polyoxymethylene (POM) are advantageous.
  • the common supply channel of the means for preferably regulatable / controllable metering may have a circular cross-sectional area with a diameter of 6 to 20 mm, preferably 10 to 15 mm, and the metering channel of the means for preferably controllable metering connected to the common supply channel may also have a circular cross-sectional area with a diameter of 2 to 10 mm, preferably from 4 to 6 mm.
  • both the common supply channel as well as the Zudosierkanal - seen in respective longitudinal direction - have a constant, a continuously converging or a sudden widening channel cross-section.
  • the Zudosierkanäle of the means for preferably adjustable / controllable metering, which opens at different heights, can be arranged at equal or approximately equal intervals.
  • the means for preferably controllable metering may have a preferably equal or approximately equal spacing in the headbox width direction in the range of 10 to 100 mm, preferably 25, 33, 50 or 66 mm, and the means for preferably regulating / itself controllable metering may have a length - depending on the height of the intermediate channel - in the range of 60 to 350 mm, preferably from 100 to 250 mm, and a height in the range of 50 to 300 mm, preferably from 75 to 250 mm.
  • the length of the metering blade in the direction of flow of the at least one pulp suspension designed for preferably controllable metered addition of the fluid in partial fluid streams into the at least one pulp suspension and the length of the intermediate channel are preferably in a ratio of 1: 1.25 to 1: 5, preferably from 1: 1.5 to 1: 3, in particular from about 1: 2. These value ranges have an effect, in particular, on the desired low effective width due to a directed and steady flow upstream of the metering point and low transverse flows at the metering point.
  • the means designed as dosing means for preferably controllable metering of the fluid in partial fluid streams into the at least one pulp suspension preferably has a leading edge directed counter to the flow direction of the at least one pulp suspension, which is at an angle of 60 to 90 °, preferably 75 to 85 °, in particular of about 80 °, to the flow direction of the at least one pulp suspension runs.
  • This embodiment has fluidic advantages and can carry away any dirt particles adhering to the leading edge due to a "vertical component" in the direction of the free middle end.
  • the front edge of the formed as a metering means for preferably controllable metered addition of the fluid in fluid streams into the at least one pulp suspension an end face having a width of at least 3 mm, preferably at least 5 mm, in particular about 10 mm, and / or at least on one side, preferably be provided on both sides with a lateral rounding or bevel.
  • the lateral rounding can take on a value in the range of 0.1 to 0.45, preferably 0.33, in particular 0.25, • the width of the agent.
  • the chamfer can have a chamfer angle in the range of 25 to 75 °, preferably 30 to 60 °, in particular 45 °.
  • the flow after the means for preferably controllable metered addition can be substantially calmed due to the avoidance of detachment vortices on the outlet-side region of the means for preferably controllable metered addition.
  • the width of the metering blade formed as a means for preferably controllable metered addition of the fluid in partial fluid streams in the at least one pulp suspension and the division of two arranged in adjacent columns of the turbulence generating means flow channels are preferably in a ratio of 1: 5 to 1: 1.25 , preferably from 1: 3 to 1: 1.5, in particular from about 1: 1.65.
  • the width of the metering blade formed as a means for preferably controllable metered addition can assume a value in the range of 20 to 50 mm.
  • the Zudosierö Stamme formed as a metering agent for preferably controllable metered addition of the fluid in fluid streams into the at least one pulp suspension can all open on the one hand at different heights or they can otherwise lead in pairs in equal or approximately equal heights and in this case an opening angle between have the opening center lines in the range of -30 to + 30 °, preferably from 0 to 30 °, in particular from 10 to 30 °.
  • the point of impact of the metering orifice center line of the individual metering opening on the turbulence generating means may be approximately centrally, preferably centrally between the slot planes of two adjacent flow channels or approximately flush, preferably aligned with the flow channel centerline of the flow channel of the turbulence generating means. Also, at least in regions, a height-wise offset of the metering opening center lines of the metering openings to the flow channel center lines of the flow channels of the turbulence generating means is possible.
  • the Verteillochlochplatte and the intermediate channel have a total length of a maximum of 500 mm, preferably of at most 350 mm, in particular of at most 300 mm.
  • the feed device and the channels of the distribution well plate are preferably dimensioned such that the flow rate of the at least one pulp suspension in the feeder and the average flow rate of the at least one pulp suspension in the channels of the distribution well plate are in a ratio of 1: 2 to 1: 3 ,
  • the respective channel of the distribution well plate - seen in the flow direction - have a constant, a continuously diverging or at least once at a time widening channel cross-section.
  • the single channel of the distribution well plate preferably has a round channel cross-section with a channel diameter and the average channel diameter of the single channel of the distribution well plate and the length of the distribution well plate are ideally in a ratio of 1: 2 to 1:10, preferably 1: 3 to 1: 8, in particular from 1: 4 to 1: 5. These value ranges allow improved stability of the headbox in an optionally larger operating window.
  • 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 pulp suspension in the headbox.
  • the headbox according to the invention is outstandingly suitable for use in a machine for producing a fibrous web, in particular paper or board 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.
  • FIG. 1 shows a vertical and schematic longitudinal sectional view of an exemplary embodiment of a headbox 1 for a machine for producing a fibrous web 3 from a pulp suspension 2.
  • the illustrated headbox 1 can of course also be designed as a multi-layer headbox, which uses at least two different pulp suspensions for producing 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 a pulp suspension 2, for example in the embodiment of a transverse distributor tube 5 or a rotary distributor (not illustrated) with a multiplicity of hoses.
  • the feeder 4 is followed downstream by a Verteilrohrlochplatte 6, which has a plurality of arranged in rows Z and in columns S channels 7.
  • the individual means 9 for preferably controllable metered addition in each case comprises a plurality of metering channels 11 having a respective metering channel length 11 .L and exit-side metering channel opening 11. 1, opening at different heights and connected to a common supply channel 12 (cf. FIG. 2 ).
  • a turbulence generating means 13 Downstream of the intermediate channel 8 is a turbulence generating means 13 having a plurality of flow channels 14 arranged in rows Z and columns S.
  • the pulp suspension 2 in the turbulence generating means 13 is divided into pulp suspension partial streams and after exiting the turbulence generating means in one Machine width chamber 15 in the design of a nozzle gap 17 having headbox 16 merged again to allow the formation of a machine-width fibrous web 3.
  • the flow channels 14 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 areas.
  • the headbox 16 may be provided on the outlet side at least one side with a dashed line indicated aperture 18.
  • FIG. 2 now shows a fragmentary detail of the in the FIG. 1 schematically illustrated headbox 1.
  • the Zudosierkanalratio 11.L of each Zudosierkanals 11 is greater than 1.5 • the outlet side Zudosierkanalö Stamm 11.1 of the same Zudosierkanals 11 and the distance A of the outlet side Zudosierkanalö founded 11.1 of the same Zudosierkanals 11 to the turbulence generating means 13, in particular to an inlet plate 13.1 of the turbulence generating means 13 is located in a range of 0 to 50 mm, preferably 0 to 30 mm, especially 10 to 25 mm.
  • the width 9.B (arrow) of the means 9 designed as a metering blade 9.1 for preferably controllable metering of the fluid 10 (arrow) into partial fluid streams 10.T (arrow) into the pulp suspension 2 and the pitch 14.T (arrow) two flow channels 14 arranged in adjacent columns S of the turbulence generating means 13 are in a ratio of 1: 5 to 1: 1.25, preferably 1: 3 to 1: 1.5, in particular about 1: 1.65.
  • the width 9.B (arrow) of the means 9 designed as a metering blade 9.1 for preferably controllable metering can assume a value in the range from 20 to 50 mm.
  • the means 9 for preferably controllable metered addition have a preferably the same or approximately equal pitch T (arrow) in the width direction of the headbox 1 in the range of 10 to 100 mm, preferably 25, 33, 50 or 66 mm.
  • the means 9 designed as a metering blade 9.1 for preferably controllable metered addition of the fluid 10 into partial fluid streams 10T (arrow) into the at least one pulp suspension 2 is arranged on the lower wall 8.1 of the intermediate channel 8.
  • the means 9 for preferably controllable / metered metering could also be arranged on the upper wall 8.2 of the intermediate channel 8.
  • the two walls 8.1, 8.2 of the intermediate channel 8 are arranged parallel to each other in the present case; However, they could also only partially executed parallel to each other, parallel, convergent, divergent or spherical curved and arranged.
  • the means 9 for preferably controllable metered addition are arranged in a row; However, they can also be arranged in at least two rows, wherein they can also be arranged offset from each other.
  • the distribution well plate 6 and the intermediate channel 8 have a total length LG of at most 500 mm, preferably of at most 350 mm, in particular of at most 300 mm.
  • the feeding device 4 and the channels 7 of the distribution well plate 6 are dimensioned such that the flow velocity v.4 (arrow) of the pulp suspension 2 in the feeding device 4 and the flow velocity v.7 (arrow) of the pulp suspension 2 in the channels 7 of the distribution well plate 6 are in a ratio of 1: 2 to 1: 3.
  • FIG. 3 shows a schematic detail of the in the FIG. 2 schematically shown means 9 for preferably adjustable / controllable metering of the fluid 10 (arrow) in partial fluid streams 10.T (arrows).
  • the metering channels 11 of the metering blade 9. 1 which are preferably arranged at different heights and are preferably regulated / controllable metered addition, are arranged at equal or approximately equal distances a and have a circular cross-sectional area 11.Q with a diameter 11.D of 2 to 10 mm , preferably from 4 to 6 mm.
  • the common supply channel 12 of the means 9 for preferably controllable metered addition has a circular cross-sectional area 12.Q with a diameter 12.D of 6 to 20 mm, preferably from 10 to 15 mm.
  • Both the common supply channel 12 and the individual metering channel 11 have - viewed in the respective longitudinal direction - a constant, a continuously converging or a sudden widening channel cross section 12.Q, 11.Q on.
  • the means 9 for preferably controllable metered addition has a length 9.L in the range of 60 to 350 mm, preferably 100 to 250 mm, and a height 9.H in the range of 50 to 300 mm, preferably from 75 to 250 mm, on, wherein the height 9.H depending on the clear height of the intermediate channel 8H 8 (see. FIG. 2 ) is selected.
  • a gap of ⁇ 3 mm, preferably of ⁇ 5 mm, remains between the means 9, which is designed as a metering blade 9.1, for preferably metered / controllable metering and the adjacent wall of the intermediate channel 8 (cf. FIG. 2 ).
  • the means 9 designed as a metering blade 9.1 for preferably metered / controllable metering of the fluid 10 (arrow) into partial fluid streams 10.T (arrows) into the pulp suspension 1 has one opposite to the direction of flow R (arrow) of the pulp suspension 2 directed front edge 19 which extends at an angle ⁇ of 60 to 90 °, preferably from 75 to 85 °, in particular of about 80 °, to the flow direction R (arrow) of the pulp suspension 2.
  • FIG. 4 shows a view of the in the FIG. 3 illustrated means 9 for preferably regulatable / controllable metering of the fluid 10 in partial fluid streams 10.T (arrow).
  • the front edge 19 of the device 9 designed as a metering blade 9.1 for preferably controllable metered addition of the fluid 10 in partial fluid streams 10.T (arrow) into the pulp suspension 2 has an end face 20 with a width 20.B of at least 3 mm, preferably of at least 5 mm, in particular of about 10 mm. Also, the front edge 19 of the means 9 for preferably adjustable / controllable metering is provided on both sides with a lateral chamfer 21.
  • the chamfer 21 may have a chamfer angle in the range of 25 to 75 °, preferably 30 to 60 °, in particular 45 °.
  • the means 9 tapers for preferably controllable metered addition in the flow direction R (arrow) of the pulp suspension 2 on both sides, the preferably continuous taper 23 a taper angle ⁇ of at most 20 °, preferably of at most 10 °, in particular of a maximum of 7 °.
  • FIG. 5 shows a schematic detail of another embodiment of the means 9 for preferably controllable / metered addition of the fluid 10 (arrow) in partial fluid streams 10.T (arrows).
  • the basic structure of this means 9 for preferably controllable / metered addition substantially corresponds to the basic structure of the in the FIG. 3 schematically illustrated means 9 for preferably controllable / controllable metering, so that reference is also made to this description of the figures.
  • the metering openings 11.1 of the metering channels 11 of the metering device 9.1 designed as means 9 for preferably regulated / controllable metering of the fluid 10 (arrow) in partial fluid streams 10T (arrows) in the pulp suspension 2 open in pairs at the same or approximately equal heights and they have an opening angle ⁇ between the opening center lines 11.M in the range of - 30 to + 30 °, preferably from 0 to 30 °, in particular from 10 to 30 °, on (see. FIG. 6 ).
  • the paired Zudosierkanäle 11 of 9 formed as a metering blade 9.1 means for preferably adjustable / controllable metering of the fluid 10 (arrow) in partial fluid streams 10.T (arrows) in the pulp suspension 2 are arranged at equal or approximately equal distances a.
  • FIG. 6 shows a view of the in the FIG. 5 illustrated means 9 for preferably regulated / controllable metering of the fluid 10 in partial fluid streams 10.T (arrows).
  • the front edge 19 of the device 9 designed as a metering blade 9.1 for preferably controllable metered addition of the fluid 10 in partial fluid streams 10.T (arrow) into the pulp suspension 2 has an end face 20 with a width 20.B of at least 3 mm, preferably of at least 5 mm, in particular of about 10 mm.
  • the front edge 19 of the means 9 for preferably adjustable / controllable metering is provided on both sides with a lateral rounding 24.
  • the lateral rounding 24 can assume a value in the range from 0.1 to 0.45, preferably from 0.33, in particular from 0.25, the width 9.B of the means 9 designed as a metering blade 9.1.
  • the means 9 tapers for preferably controllable metered addition in the flow direction R (arrow) of the pulp suspension on both sides, wherein the preferably continuous taper 23 a Rejuvenation angle ⁇ of a maximum of 20 °, preferably of at most 10 °, in particular of at most 7 °.
  • FIG. 7 shows a schematic detail of a third embodiment of the means 9 for preferably controllable / metered addition of the fluid 10 (arrow) in partial fluid streams 10.T (arrows).
  • the basic structure of this means 9 for preferably controllable / metered addition substantially corresponds to the basic structure of in the FIG. 3 shown means 9 for preferably regulated / controllable metering, so that reference is also made to this description of figures.
  • the metering ducts 11 of the fluid 9 (9) designed as a metering blade 9.1 for preferably controllable metered addition of the fluid 10 (arrow) into partial fluid streams 10T (arrows) into the pulp suspension 2 are arranged at equal or approximately equal distances a and have a circular cross-sectional area 11.Q with a diameter 11.D of 2 to 10 mm, preferably from 4 to 6 mm.
  • the common supply channel 12 of the means 9 for preferably controllable metered addition has a circular cross-sectional area 12.Q with a diameter 12.D of 6 to 20 mm, preferably from 10 to 15 mm.
  • the means 9 designed as a metering blade 9.1, for preferably metered / controllable metering in the area on both sides 25.1, 25.2 (cf. FIG. 8 ) between two outlet-side Zudosierkanalö Stammen 11.1 of adjacent in the longitudinal direction Zudosierkanälen 11 with at least one recess 26 is provided.
  • FIG. 8 shows a view of the in the FIG. 7 schematically shown means 9 for preferably controllable / controllable metering of the fluid 10 in partial fluid streams 10.T (arrows).
  • FIG. 9 shows a vertical and schematic longitudinal sectional view of a Verteillochlochplatte 6 of the headbox 1 of the invention for a machine for producing a fibrous web from at least one pulp suspension with five channels 7 with different channel cross-sections 7.Q.
  • the distribution well plate 6 has five rows Z1 to Z5 on channels 7 and a plurality of columns S on channels 7. All channels 7 have a consistently round channel cross section 7.Q, but in different shapes and configurations. Also, all channels 7 are provided on the inlet side with a respective intake chamfer 27 known to the person skilled in the art.
  • the channels 7 of the two upper lines Z4, Z5 initially have a constant channel cross section 7.Q, which ultimately experiences a continuous extension 28, in particular a cone 28.1 with a cone angle ⁇ of ⁇ 30 °.
  • the channels 7 of the middle row Z3 initially again have a constant channel cross section 7.Q, which ultimately experiences two jump-like extensions 29, in particular increments 29.1, 29.2.
  • the channels 7 of the two lower rows Z1, Z2 initially again have a constant channel cross section 7.Q, which ultimately experiences only a sudden extension 29, in particular a step jump 29.1.
  • Each individual channel 7 of the distribution well plate 6 thus has at least initially a round channel cross section 7.Q with a channel diameter 7.D and then ultimately forms at least one diffuser 30 due to at least one Extension 28, 29 off.
  • the mean channel diameter 7.DM of the channel 7 of the distribution well plate 6 and the length 6.L of the distribution well plate 6 are in a ratio of 1: 2 to 1:10, preferably from 1: 3 to 1: 8, in particular from 1: 4 to 1: 5.
  • the means 9, designed as a metering blade 9.1 for preferably controllable metering consists at least of a metal, such as a stainless steel, titanium or bronze, or a plastic, such as a thermosetting plastic, of a thermoplastic, made of a (hard) rubber, a GRP, CFK or similar.
  • a metal such as a stainless steel, titanium or bronze
  • a plastic such as a thermosetting plastic, of a thermoplastic, made of a (hard) rubber, a GRP, CFK or similar.
  • a plastic version in particular the materials polyamide (PA), polyphenylsulfone (PPSU), Teflon (PTFE), polyoxymethylene (POM) are advantageous.
  • the headbox 1 of the FIGS. 1 to 4 flowing fluid 10 consists at least of water, in particular white water or clear water, or from at least one pulp suspension whose concentration differs from the average concentration of at least one in the headbox 1 flowing pulp suspension 2.
  • the headbox 1 shown and described in each case in the figures is particularly suitable for use in a machine for producing a fibrous web 3, in particular paper or board web, from at least one fibrous stock suspension 2.
  • a headbox of the type mentioned is improved by the invention so that a most extensive, preferably complete avoidance of the disadvantages of the prior art and a significantly improved fulfillment of the particular technological requirements is reached.
  • the headbox according to the invention has a technically simple and reliable Zudosiersystem, which is also still inexpensive and technically easy to perform.

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Claims (15)

  1. Caisse de tête (1) pour une machine de fabrication d'une bande fibreuse (3), en particulier d'une bande de papier ou de carton, constituée d'au moins une suspension de fibres (2), comprenant un dispositif d'alimentation (4, 5) acheminant l'au moins une suspension de fibres (2), comprenant une plaque perforée de tubes de distribution (6) se raccordant en aval et présentant une pluralité de canaux (7) disposés en lignes (Z) et en colonnes (S), comprenant un canal intermédiaire (8) situé en aval de celle-ci, s'étendant sur la largeur (B) de la caisse de tête (1), avec plusieurs moyens (9) espacés les uns des autres dans la direction de la largeur de la caisse de tête (1) pour le dosage de préférence réglable ou commandable d'un fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2), le moyen individuel (9 ; 9.1) comprenant à chaque fois plusieurs canaux de dosage (11) présentant une ouverture de canal de dosage respective (11.1) côté sortie et une longueur de canal de dosage (11.L), débouchant à différentes hauteurs et connectés à un canal d'alimentation commun (12), comprenant un moyen de génération de turbulences (13) disposé en aval avec une pluralité de canaux d'écoulement (14) disposés en lignes (Z) et en colonnes (S) et avec une buse de caisse de tête (16) se raccordant directement au moyen de génération de turbulences (13) et présentant une fente de buse (17),
    caractérisée en ce que
    la longueur de canal de dosage (11.L) du canal de dosage (11) est supérieure à 1,5 fois l'ouverture de canal de dosage côté sortie (11.D) du canal de dosage (11) et en ce que la distance (A) de l'ouverture de canal de dosage côté sortie (11.1) du canal de dosage (11) au moyen de génération de turbulence (13), en particulier à une plaque d'entrée (13.1) du moyen de génération de turbulence (13), est comprise dans une plage de 0 à 50 mm, de préférence de 0 à 30 mm, en particulier de 10 à 25 mm.
  2. Caisse de tête (1) selon la revendication 1,
    caractérisée en ce que
    le moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) est disposé au niveau de la paroi inférieure (8.1) et/ou de la paroi supérieure (8.2) du canal intermédiaire (8).
  3. Caisse de tête (1) selon la revendication 1 ou 2,
    caractérisée en ce que
    la longueur (9.L), orientée dans la direction d'écoulement (R) de l'au moins une suspension de fibres (2), du moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) et la longueur (8.L) du canal intermédiaire (8) se situent dans un rapport de 1:1,25 à 1:5, de préférence de 1:1,5 à 1:3, notamment vaut environ 1:2.
  4. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) présente une arête avant (19) orientée à l'encontre du sens d'écoulement (R) de l'au moins une suspension de fibres (2), laquelle arête s'étendant suivant un angle (α) de 60 à 90°, de préférence de 75 à 85°, particulièrement d'environ 80°, par rapport à la direction d'écoulement (R) de l'au moins une suspension de fibres (2).
  5. Caisse de tête (1) selon la revendication 4,
    caractérisée en ce que
    l'arête avant (19) du moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) présente une surface frontale (20) ayant une largeur (20.B) d'au moins 3 mm, de préférence d'au moins 5 mm, en particulier d'au moins 10 mm.
  6. Caisse de tête (1) selon la revendication 4 ou 5,
    caractérisée en ce que
    l'arête avant (19) du moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) est pourvue au moins d'un côté, de préférence des deux côtés, d'un arrondi latéral (24) ou biseau (21).
  7. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) se rétrécit au moins dans sa région du côté de la sortie (22) dans la direction d'écoulement (R) de l'au moins une suspension de fibres (2) au moins d'un côté, de préférence des deux côtés, le rétrécissement (23) de préférence constant présentant un angle de rétrécissement (5) de 20° au maximum, de préférence de 10° au maximum, notamment de 7° au maximum.
  8. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la largeur (9.B) du moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) et la division (14.T) de deux canaux d'écoulement (14) disposés dans des fentes adjacentes (S) du moyen de génération de turbulences (13) se situent dans un rapport de 1:5 à 1:1,25, de préférence de 1:3 à 1:1,5, notamment d'environ 1:1,65.
  9. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) est pourvu, dans la région au moins d'un côté, de préférence des deux côtés (25.1, 25.2), entre deux ouvertures de canal de dosage du côté de la sortie (11.1) de canaux de dosage (11) adjacents dans la direction longitudinale, d'au moins un évidement (26).
  10. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    toutes les ouvertures de dosage (11.1) des canaux de dosage (11) du moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) débouchent à des hauteurs différentes.
  11. Caisse de tête (1) selon l'une quelconque des revendications 1 à 9,
    caractérisée en ce que
    les ouvertures de dosage (11.1) des canaux de dosage (11) du moyen (9) réalisé sous forme de lame de dosage (9.1) pour le dosage de préférence réglable ou commandable du fluide (10) en flux partiels de fluide (10.T) dans l'au moins une suspension de fibres (2) débouchent par paires à des hauteurs identiques ou approximativement identiques et présentent un angle d'ouverture (χ) entre les axes médians des ouvertures (11.M) de l'ordre de -30 à +30°, de préférence de 0 à 30°, notamment de 10 à 30°.
  12. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la plaque perforée de tubes de distribution (6) et le canal intermédiaire (8) présentent une longueur totale (LG) de 500 mm au maximum, de préférence de 350 mm au maximum, notamment de 300 mm au maximum.
  13. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le dispositif d'alimentation (4, 5) et les canaux (7) de la plaque perforée de tubes de distribution (6) sont dimensionnés de telle sorte que la vitesse d'écoulement (v.4) de l'au moins une suspension de fibres (2) dans le dispositif d'alimentation (4, 5) et la vitesse d'écoulement (v.7) de l'au moins une suspension de fibres (2) dans les canaux (7) de la plaque perforée de tubes de distribution (6) se situent dans un rapport de 1:2 à 1:3.
  14. Caisse de tête (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le canal (7) de la plaque perforée de tubes de distribution (6) présente une section transversale de canal ronde (7.Q) avec un diamètre de canal (7.D) et en ce que le diamètre de canal moyen (7.DM) du canal (7) de la plaque perforée de tubes de distribution (6) et la longueur (6.L) de la plaque perforée de tubes de distribution (6) se situent dans un rapport de 1:2 à 1:10, de préférence de 1:3 à 1:8, notamment de 1:4 à 1:5.
  15. Machine de fabrication d'une bande fibreuse (3), en particulier d'une bande de papier ou de carton, comprenant au moins une caisse de tête (1) selon l'une quelconque des revendications 1 à 14.
EP09740124A 2008-12-18 2009-10-22 Caisson de tête pour machine de fabrication d'une bande de matière fibreuse Not-in-force EP2379799B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008054898A DE102008054898A1 (de) 2008-12-18 2008-12-18 Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
PCT/EP2009/063837 WO2010069649A1 (fr) 2008-12-18 2009-10-22 Caisson de tête pour machine de fabrication d'une bande de matière fibreuse

Publications (2)

Publication Number Publication Date
EP2379799A1 EP2379799A1 (fr) 2011-10-26
EP2379799B1 true EP2379799B1 (fr) 2012-12-12

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EP09740124A Not-in-force EP2379799B1 (fr) 2008-12-18 2009-10-22 Caisson de tête pour machine de fabrication d'une bande de matière fibreuse

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US (1) US8221590B2 (fr)
EP (1) EP2379799B1 (fr)
CN (1) CN102216521B (fr)
DE (1) DE102008054898A1 (fr)
WO (1) WO2010069649A1 (fr)

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DE102008054897A1 (de) 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054898A1 (de) 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008054896A1 (de) 2008-12-18 2010-07-01 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102009027013A1 (de) 2009-06-18 2010-12-23 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102010001555A1 (de) 2010-02-03 2011-08-04 Voith Patent GmbH, 89522 Ventil zum Regulieren eines Fluidstroms
DE102010001557A1 (de) 2010-02-03 2011-08-04 Voith Patent GmbH, 89522 Ventil zum Regulieren eines Fluidstroms
DE102010001541A1 (de) 2010-02-03 2011-08-04 Voith Patent GmbH, 89522 Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102010028403A1 (de) 2010-04-30 2011-11-03 Voith Patent Gmbh Ventil zum Regulieren eines Fluidstroms
DE102010028404A1 (de) 2010-04-30 2011-11-03 Voith Patent Gmbh Ventil zum Regulieren eines Fluidstroms
DE102010028408A1 (de) 2010-04-30 2011-11-03 Voith Patent Gmbh Ventil zum Regulieren eines Fluidstroms
DE102010030352A1 (de) 2010-06-22 2011-12-22 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102010038891A1 (de) 2010-08-04 2012-02-09 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102011003849A1 (de) 2011-02-09 2012-08-09 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
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Also Published As

Publication number Publication date
US8221590B2 (en) 2012-07-17
CN102216521B (zh) 2014-05-14
DE102008054898A1 (de) 2010-06-24
CN102216521A (zh) 2011-10-12
EP2379799A1 (fr) 2011-10-26
WO2010069649A1 (fr) 2010-06-24
US20110290441A1 (en) 2011-12-01

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