EP1793035A2 - Caisse de tête d'une machine de fabrication d'une bande fibreuse - Google Patents

Caisse de tête d'une machine de fabrication d'une bande fibreuse Download PDF

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Publication number
EP1793035A2
EP1793035A2 EP06123354A EP06123354A EP1793035A2 EP 1793035 A2 EP1793035 A2 EP 1793035A2 EP 06123354 A EP06123354 A EP 06123354A EP 06123354 A EP06123354 A EP 06123354A EP 1793035 A2 EP1793035 A2 EP 1793035A2
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EP
European Patent Office
Prior art keywords
fluid
headbox
flow
metering
flow channels
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Withdrawn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
EP06123354A
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German (de)
English (en)
Other versions
EP1793035A3 (fr
Inventor
Bernd Weißgerber
Simon Juhas
Konstantin Fenkl
Wolfgang Ruf
Uli Dürr
Klaus Lehleiter
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Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1793035A2 publication Critical patent/EP1793035A2/fr
Publication of EP1793035A3 publication Critical patent/EP1793035A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • D21F1/026—Details of the turbulence section
    • 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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a headbox of a machine for producing a fibrous web, in particular paper or board web, from at least one pulp suspension, with at least one feed device feeding the at least one pulp suspension and at least one turbulence generating means in which during operation of the headbox the at least one pulp suspension by a Variety of preferably arranged in rows and columns flow channels, thereby divided into turbulent pulp suspension partial flows and is merged after exiting the turbulence generating means in a preferably machine-width chamber, wherein in the region of the turbulence generating means for metering at least one fluid in the plurality of flow channels are provided.
  • Such a headbox is for example from the German patent application DE 199 26 805 A1 known.
  • This document moreover shows a metering tube designed as a means for metering a fluid into a stock suspension flow of a turbulence tube.
  • the metering tube is provided with at least one lateral opening, which is associated with at least one opening in the turbulence tube.
  • each flow channel is at least partially flows at least partially from the at least one guided in the associated means fluid outside at least partially, and that each flow channel is provided with at least one metering opening for at least partially receiving the fluid flowing around it at least partially, so that in the region of the metering opening a mixed partial flow formed from the pulp suspension partial flow and the at least one accommodated partial fluid flow is formed.
  • the invention provides the possibility of adding the additional fluid without any dimensional dependence on the flow channels and the means.
  • the flow channels for example in the form of thin-walled turbulence tubes and / or turbulence tube inserts, can be dimensioned independently of the mean, so that the required for a good volume constancy of the two streams and relatively slow flow velocities in both components due to the largest possible flow cross-sections at least Range of dosing can be achieved.
  • the required total volume constancy of the mixed flow in the individual flow channel of the turbulence generating means and thus also in the entire turbulence generating means is easily achieved.
  • a low dynamics causes the desired low energy loss, so that an inventive arrangement of the flow channels at relatively low downstream pressure losses can be realized.
  • the invention also offers the possibility of the greatest possible degree of freedom in the arrangement and in the design of the flow channels and the means.
  • the flow channels arranged in a column are provided in such a way that they are either partially or completely circumscribed externally, at least in sections, by the at least one fluid carried in the associated means.
  • all the flow channels arranged in one column can be completely or partially completely enclosed on the outside.
  • an externally complete flow around the flow channels arranged in the column there is also the possibility that they are completely enveloped on the outside, symmetrically or approximately symmetrically, by the at least one fluid guided in the associated means.
  • the pitch of the flow channels of the turbulence-generating means can be appreciably reduced.
  • the cross-sectional area of the means can be chosen significantly larger than in the known systems.
  • the means for metering in at least one fluid are designed such that the flow channels of at least two adjacent columns are at least partially partially or completely surrounded on the outside by the at least one fluid guided in the associated means.
  • means for metering in the at least one fluid can be completely or partially encased outside on the outside.
  • an externally complete flow around the flow channels arranged in the column there is also the possibility that they are completely enveloped symmetrically or approximately symmetrically on the outside by the at least one fluid guided in the associated means.
  • the pitch of the flow channels of the turbulence generating means can again be appreciably reduced.
  • the cross-sectional area of the means can again be chosen significantly larger than in the known systems.
  • a decisive advantage is also that the number of means is at least halved, as a means supplies at least the flow channels of two adjacent columns. This creates a noticeable cost advantage with noticeably less control effort for the metered addition.
  • a plurality of flow channels at least in sections have at least one cross-sectional taper and / or cross-sectional widening, wherein at least one metering opening is arranged in the region of the at least one respective cross-sectional change.
  • the change in cross section causes, inter alia, a favorable turbulence change at least within the pulp suspension partial flow.
  • the flow rate of the fluid can be kept to a certain extent by serially varying the geometries of the flow channels.
  • the fluid in or opposite the direction of flow of the pulp suspension partial stream are added, which in turn results in corresponding advantages, for example with regard to the quality of the volume constancy of the two partial streams.
  • the flow channel preferably has a plurality of, preferably two metering openings, which are arranged in the flow channel preferably symmetrically to the flow direction of the at least one fibrous suspension partial flow.
  • the flow channel has at least one metering opening, which is arranged in a region opposite to the flow direction of the at least one fluid in the flow channel.
  • the region opposite to the flow direction of the at least one fluid is in this case the rear region of the flow channel.
  • This area is the so-called dead water area, whereby a lower dynamic pressure is set at the metering point. Furthermore, the danger of sedimentation at this point is very low, since the dead water area is a "floating" area.
  • the flow channel may of course also have a plurality, preferably two, metering openings, which are arranged in a region opposite to the flow direction of the at least one fluid in the flow channel, preferably symmetrically to the flow direction of the at least one fluid.
  • a plurality, preferably two, metering openings which are arranged in a region opposite to the flow direction of the at least one fluid in the flow channel, preferably symmetrically to the flow direction of the at least one fluid.
  • At least one metering opening preferably has a preferably circular, one in the flow direction of the pulp suspension partial flow elongated, in particular oval or slot-like, a rectangular, in particular square, or similar cross-sectional area.
  • a preferably circular, one in the flow direction of the pulp suspension partial flow elongated, in particular oval or slot-like, a rectangular, in particular square, or similar cross-sectional area is provided.
  • adjacent means arranged offset in the flow direction of the pulp suspension partial flows to each other in particular in at least two rows are arranged alternately offset from each other.
  • at least two means in the flow direction of the pulp suspension partial stream can be arranged one behind the other.
  • the possible arrangements of the funds favor a variety of possible Zudosierève. For example, by means of a first means the flow channels of a straight line and by a second means the flow channels of an odd line of the turbulence generating means can be supplied with a fluid. Also agents with different qualities can be added selectively and staggered.
  • the cross-sectional area of the individual means is preferably constant at least in sections in the flow direction of the at least one fluid and / or tapers at least in sections continuously and / or discontinuously.
  • the flow rate of the mean fluid flow can be kept constant.
  • the turbulence generating means in the first embodiment is a turbulence generator in which the at least one pulp suspension flows through a plurality of preferably in rows and in columns flow channels, thereby divided into turbulent pulp suspension partial flows and after exiting the turbulence generator in one the turbulence generator in the flow direction of at least one pulp suspension downstream headbox is brought together again to the formation of a machine-wide fibrous web enable.
  • means are then provided for metering in at least one fluid into the multiplicity of flow channels.
  • the turbulence generator may have at least one turbulence generator block and the means may be formed as part of the turbulence generator block or the turbulence generator may have at least one turbulence generator block and the means may be formed as a component of at least one component arranged upstream of the turbulence generator block.
  • the turbulence generating means is a tube bank and in the region of the tube bank means for metering at least one fluid into the plurality of flow channels are provided.
  • the tube bank may have at least one tube bank block and the means may be formed as part of the tube bank block or the tube bank may have at least one tube bank block and the means may be formed as part of at least one upstream of the tube bank block arranged component.
  • the means for metering the at least one fluid into a plurality of flow channels may, in the first preferred embodiment, be a fluid distribution chamber having a preferably rectangular, in particular square, cross-sectional area, viewed in the flow direction of the at least one fluid. In a second preferred embodiment, it can be a fluid distribution bore with a preferably circular cross-sectional area viewed in the flow direction of the at least one fluid. Both preferred embodiments best meet the demands placed on them at comparatively low production costs and good performance.
  • 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 a headbox according to the invention has consistently excellent properties, since, inter alia, the control of both its fiber orientation transverse profile and its basis weight cross-section is possible.
  • FIGS. 1a and 1b show vertical longitudinal sections through headboxes 1 of a machine for producing a fibrous web, in particular a paper or board web, from a pulp suspension 2.
  • the illustrated headboxes 1 can of course also be configured as multilayer headboxes comprising at least two different pulp suspensions for producing a fibrous web use.
  • the fibrous web may in particular be a paper, board or tissue web.
  • the headbox 1 shown in FIG. 1a has a feed device 3 which feeds the pulp suspension 2, for example in the embodiment of an illustrated transverse distributor tube 4 or a rotary distributor (not illustrated) with a large number of tubes.
  • the headbox 1 has a turbulence generator 5 (turbulence generating means) arranged downstream of the feed device 3 in the flow direction S (arrow) of the pulp suspension 2.
  • This turbulence generator 5 has a plurality of preferably in lines Z.1 to Z.4 and in columns S.1 to S.11 ( Figure 2) arranged flow channels 6 (6.1 to 6.44) ( Figure 2).
  • the flow channels 6 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 flow cross sections.
  • the flow channels 6 are flowed through by the pulp suspension 2, whereby they are divided into turbulent pulp suspension partial flows 7 (7.1 to 7.44) (FIG. 2) and, after exiting the turbulence generator 5, in a flow direction S (arrow) in the turbulence generator 5.
  • the pulp suspension 2 downstream headbox 8 is brought together again to allow the formation of a machine-wide fibrous web.
  • the headbox 8 can be considered as a machine-wide chamber.
  • means 9 for metering in at least one fluid 10 into the multiplicity of flow channels 6 (6.1 to 6.44) (FIG. 2) are provided in the region of the turbulence generator 5.
  • the headbox 1 shown in FIG. 1b corresponds at least in the second part of the flow path of the pulp suspension 2 to the headbox shown in FIG. 1a. Thus, reference is hereby made to its description.
  • the headbox 1 of FIG. 1b has both a tube bank 15 (further turbulence generating means) as a feed device 3 feeding the pulp suspension 2 and the turbulence generator 5 and in the flow direction S (arrow) of the pulp suspension 2 preferably machine-width chamber 16 on.
  • the chamber 16, which is also referred to as the intermediate chamber, may in a further embodiment have a plurality of partition walls which, at least in sections, subdivide it into a plurality of sectioned partial chambers.
  • the tube bank 15 has a multiplicity of flow channels 6 (6.1 to 6.44) (FIGS. 6.1 to 6.44) which are preferably arranged in rows Z.1 to Z.4 and in columns S.1 to S.11 (FIG. 2) (FIG. 2).
  • the flow channels 6 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 flow cross sections.
  • the flow channels 6 are traversed by the pulp suspension 2, wherein it is divided into turbulent pulp suspension partial streams 7 (7.1 to 7.44) ( Figure 2) and merged after exiting the tube bank 15 in the preferably machine-width chamber 16 again.
  • means 9 for metering in at least one fluid 10 into the multiplicity of flow channels 6 (6.1 to 6.44) (FIG. 2) are provided.
  • the turbulence generator 5 can also have means 9 for metering in at least one fluid 10 into the multiplicity of flow channels 6 (6.1 to 6.44) (FIG. 2).
  • the means 9 are shown here by dashed lines. In this case, the number of rows and the number of columns of the two turbulence generating means 5, 15 may be different.
  • the respective headbox 1 illustrated in both FIGS. 1a and 1b can have both a straight base contour (FIG. 1a) and a curved base contour (FIG. 1b).
  • the means 9 shown in the two figures 1a and 1b can supply the respective fluid 10 both from above, from below and on both sides. If at least two means 9 are present, as indicated in FIG. 1 b, the fluids 10 can, in a further embodiment, also be supplied from opposite sides.
  • FIG. 2 shows a schematic view of the turbulence generating means 5 (or 15) of the headbox 1 of FIG. 1 against the flow direction S (arrow) of the pulp suspension 2.
  • the turbulence generating means 5 has a plurality of flow channels 6.1 to 6.44 arranged in rows Z.1 to Z.4 and columns S.1 to S.11.
  • the flow channels 6.1, 6.11, 6.12, 6.22, 6.23, 6.33, 6.34, 6.44 of the turbulence generating means 5 provided in the boundary zones S.1, S.11 can have a larger passage cross-section D than the remaining flow channels 6 of the columns S.2 to S.10 own, which are not explicitly shown.
  • the pitch of the flow channels 6.1 to 6.44 arranged in the columns S1 to S11 can be different over the machine width M.
  • the marginal divisions may be larger than the central divisions.
  • FIGS. 3 to 28 now show sections and views, in each case in section, of various embodiments of a turbulence generating means 5 of a headbox according to the invention.
  • FIGS. 3 to 28 are all in common that the means 9 for metering in at least one fluid 10 into the plurality of flow channels 6 are provided in the area of the turbulence generating means 5 such that each flow channel 6.1 to 6.44 (FIG. 2) at least sometimes at least partially flows around the at least one out in the associated means 9 fluid 10, and that each flow channel 6.1 to 6.44 (Figure 2) with at least one Zudosierö Stamm 11 for at least partially receiving him at least is provided in the region of the metering orifice 11, a mixed partial flow 12.1 to 12.44 (FIG. 2) formed from the pulp suspension partial flow 7.1 to 7.44 (FIG. 2) and the at least one absorbed partial fluid flow 10.1 to 11.44 (FIG. 2).
  • the fluid 10 is preferably water, in particular clear water, and / or from a pulp suspension, in particular white water, the concentration of which differs from the average concentration of the at least one pulp suspension 2 in the headbox 1.
  • Figures 3 and 4 show horizontal and partial longitudinal sections through two embodiments of a turbulence generating means 5 of a head box according to the invention.
  • the turbulence generating means 5 have arranged in columns S.A flow channels 6.A, which are at least partially in sections and symmetrically completely surrounded by the guided in the associated means 9 fluid 10 outside.
  • a arranged in the column SA is a fluid distribution bore 13 with a preferably circular cross-sectional area QM, viewed in the flow direction F (arrow) of the fluid 10.
  • the individual metering opening 11 also has an elongated, in particular slot-like, cross-sectional area QZ in the flow direction T (arrow) of the pulp suspension partial stream 7.A.
  • the flow channels 6. A shown and arranged in the gaps S.A have mostly constant flow cross-sections q.
  • the flow channel 6.A of Figure 3 is also formed at least partially converging. He is also trained with a step change between two constant distances.
  • the flow channel 6.A of Figure 4 is only divergent at least partially formed.
  • FIGS. 5 and 7 show vertical and fragmentary cross sections through various embodiments of a turbulence generating means 5 of a head box according to the invention.
  • FIG. 6 shows horizontal and partial longitudinal sections through the turbulence generating means 5 of FIGS. 5 and 7, wherein it also corresponds to FIG.
  • the flow channels 6.A of the turbulence generating means 5 arranged in columns S.A. are in turn at least partially and symmetrically completely circumscribed by the fluid 10 guided in the means 9 on the outside.
  • the means 9 for metering in the fluid 10 in the corresponding flow channel 6.A arranged in the column SA is again a fluid distribution bore 13 with a preferably circular cross-sectional area QM, viewed in the flow direction F (arrow) of the fluid 10 the cross-sectional area QM of the means 9 in the flow direction F (arrow) of the fluid 10 is at least partially constant, whereas the cross-sectional area QM of the means 9 in FIG. 7 tapers at least in sections in the flow direction F (arrow) of the fluid 10.
  • the increment is preferably arranged centrally between two flow channels 6.A.
  • the respective metering opening 11 is arranged in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A.
  • the area is arranged exactly opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A.
  • the individual metering openings 11 in turn have an elongate, in particular slot-like, cross-sectional area QZ in the flow direction T (arrow) of the pulp suspension partial stream 7.A (FIG. 6).
  • FIGS. 8 and 10 show vertical and fragmentary cross sections through various embodiments of a turbulence generating means 5 of a head box according to the invention.
  • FIG. 9 shows horizontal and partial longitudinal sections through the turbulence generating means 5 of FIGS. 8 and 10.
  • a common means 9 is preferably arranged centrally between two flow channels 6.A, 6.B arranged in the gaps S.A, S.B.
  • the means 9 for metering in the fluid 10 in the corresponding flow channel 6.A, 6.B arranged in the column SA, SB is again a fluid distribution bore 13 with a preferably circular cross-sectional area QM, viewed in the flow direction F (arrow) of the fluid 10
  • the cross-sectional area QM of the means 9 in the flow direction F (arrow) of the fluid 10 is at least partially constant, whereas the cross-sectional area of the agent in the figure 10 tapers in the flow direction F (arrow) of the fluid 10 at least in sections by leaps and bounds.
  • the increment is preferably arranged centrally between two flow channels 6.A, 6.B.
  • the respective metering opening 11 is again arranged in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A, 6.B.
  • the area lies opposite to the flow direction F (arrow) and below the perpendicular to the flow direction F (arrow) of the fluid 10.
  • the individual metering openings 11 face the center line of the means 9 and again have an elongated, in particular slot-like cross-sectional area QZ (FIG ).
  • FIGS. 11 and 13 show vertical and fragmentary cross sections through various embodiments of a turbulence generating means 5 of a head box according to the invention.
  • FIG. 12 shows horizontal and partial longitudinal sections through the turbulence generating means 5 of FIGS. 11 and 13.
  • the flow channels 6.A, 6.B of the turbulence generating means 5 arranged in columns S.A, S.B are in turn completely at least in sections but completely surrounded by the fluid 10 guided in the means 9 on the outside, but asymmetrically. It can be seen that a common means 9 is preferably arranged symmetrically to two flow channels 6.A, 6.B arranged in the gaps S.A, S.B.
  • the means 9 for metering in the fluid 10 in the corresponding flow channel 6.A, 6.B arranged in the column SA, SB is again a fluid distribution bore 13 with a preferably circular cross-sectional area QM, viewed in the flow direction F (arrow) of the fluid 10
  • the cross-sectional area QM of the means 9 in the flow direction F (arrow) of the fluid 10 is at least partially constant, whereas the cross-sectional area of the means 9 in FIG. 13 is continuous at least once in the flow direction F (arrow) of the fluid 10 rejuvenated.
  • the taper is preferably arranged centrally between two flow channels 6.A, 6.A and 6.B, 6.B.
  • the respective metering opening 11 is again arranged in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A, 6.B.
  • the area lies opposite to the flow direction F (arrow) of the fluid 10 and below the perpendicular to the flow direction F (arrow) of the fluid 10.
  • the individual metering openings 11 face the center line of the means 9 and in turn have an elongate, in particular slot-like cross-sectional area QZ ( Figure 12).
  • Figures 14 and 15 show horizontal and partial longitudinal sections through two embodiments of a turbulence generating means 5 of a head box according to the invention.
  • the means 9 for metering in the fluid 10 into the corresponding flow channel 6.A arranged in the column SA is in turn a fluid distribution bore 13 with a preferably circular cross-sectional area QM viewed in the direction of flow F (arrow) of the fluid 10.
  • the means 9 surrounds the fluid in the column SA arranged flow channel 6.A turn at least partially symmetrical and on the outside completely.
  • the illustrated flow channels 6.A have, at least in sections, at least one change in cross-section in the case of reduction or enlargement of the flow cross-sections q.
  • the flow channel 6.A of Figure 14 undergoes a cross-sectional taper
  • the flow channel 6.A of Figure 15 undergoes a cross-sectional widening.
  • the continuous or discontinuous change in cross section can, as shown in dashed lines in FIG. 14, basically take place at any desired distance of the flow channel 6.
  • At least one metering opening 11 is additionally arranged.
  • the fluid 10 can thus counter to the flow direction T (arrow) of the pulp suspension partial stream 7.A (FIG. 14) or in the flow direction T (arrow) of the pulp suspension partial stream 7.A (FIG. 15) are metered into the same.
  • FIG. 16 shows a vertical and fragmentary cross section through a preferred embodiment of a turbulence generating means 5 of a head box according to the invention.
  • the means 9 for metering in the fluid 10 in the corresponding flow channel 6.A arranged in the column SA is a fluid distribution bore 13 with a preferably circular cross-sectional area QM, viewed in the flow direction F (arrow) of the fluid 10.
  • the cross-sectional area QM of the means 9 is at least in sections constant in the flow direction F (arrow) of the fluid 10.
  • the cross-sectional area QM of the means 9 can taper at least in sections in the direction of flow F (arrow) of the fluid 10 at intervals.
  • the increment is preferably arranged centrally between two flow channels 6.A.
  • the metering opening 11 is arranged in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A.
  • the area is arranged exactly opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A.
  • the metering opening 11 may in this case have a preferably circular, an elongated, in particular oval or slot-like, in the flow direction T (arrow) of the pulp suspension partial stream 7.A, a rectangular, in particular square, or similar cross-sectional area QZ.
  • FIGS. 17 and 18 show vertical cross sections through two embodiments of a flow channel 6.A of a head box according to the invention.
  • the flow channel 6.A of Figure 17 has a plurality, a total of four Zudosierö Stamm 11, which are preferably arranged in the same distribution at the periphery of the flow channel 6.A.
  • the flow channel 6.A of FIG. 18 has two metering openings 11, which are arranged in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A preferably symmetrically to the flow direction F (arrow) of the fluid 10. The area lies opposite to the flow direction F (arrow) of the fluid 10 and below the perpendicular to the flow direction F (arrow) of the fluid 10.
  • the metering openings 11 shown in the two figures can again have a preferably circular, an elongate, in particular oval or slot-like, in the flow direction T (arrow) of the pulp suspension partial stream 7.A, a rectangular, in particular square, or similar cross-sectional area QZ.
  • Figures 19, 20, 21 and 22 are plan views of various embodiments of a turbulence generating means 5 of a head box according to the invention.
  • FIG. 23 shows a vertical and fragmentary cross section through the turbulence generating means 5 of FIG. 22.
  • the two figures 19 and 20 show turbulence generating means 5, the adjacent means 9.A, 9.B are arranged offset in the flow direction T (arrow) of the pulp suspension partial streams 7.A in at least two rows to each other.
  • the means 9.A, 9.B of FIG. 19 serve the flow channels 6.A, 6.B of a column SA, SB, wherein the means 9.A and the means 9.B are each arranged in a row RA, RB , In addition, the means 9.A, 9.B flow around the flow channels 6.A, 6.B on the outside completely.
  • the Umf facilitatorung is preferably formed symmetrically.
  • the respectively arranged in a row RA, RB means 9.A, 9.B of Figure 20 operate in pairs adjacent flow channels 6.A, 6.B a line ZA of the turbulence generating means 5.
  • the flow channels 6.A, 6.B are at least in sections of the fluid 10 carried in the means 9.A, 9.B is completely externally but asymmetrically circumscribed. It can be seen that a common means 9.A, 9.B is preferably arranged symmetrically to two flow channels 6.A, 6.B arranged in the gaps S.A, S.B.
  • the two Figures 21 and 22 show turbulence generating means 5, the means 9.A, 9.B are arranged in the flow direction T (arrow) of the pulp suspension partial streams 7.A in a row.
  • the means 9.A, 9.B of Figure 21 serve the flow channels 6.A, 6.B a column S.A, wherein the means 9.A, 9.B are arranged one behind the other in two rows R.A, R.B.
  • the means 9.A, 9.B flow around the flow channels 6.A on the outside completely.
  • the Umf facilitatorung is preferably formed symmetrically.
  • the means 9.A of Figure 22 operate in pairs adjacent flow channels 6.A, 6.B a line ZA of the turbulence generating means 5.
  • the flow channels 6.A, 6.B are at least in sections from that in the means 9.A, 9.B guided fluid 10 outside partially enclosed. It can be seen that a common means 9.A, 9.B is preferably arranged symmetrically to two flow channels 6.A, 6.B arranged in the columns SA, SB.
  • FIG. 23 shows a vertical and fragmentary cross section through the turbulence generating means 5 of FIG. 22.
  • This embodiment creates the possibility that two means 9A, 9A, 9A, 9 arranged in succession in the flow direction T (arrow) of the pulp suspension partial flow 7.A. B are formed such that in each case the fluid 10 is metered into different flow channels 6.A, 6.B.
  • the flow channels 6.A, 6.B lie in adjacent rows Z.A, Z.B.
  • FIGS. 24 and 26 show vertical and fragmentary cross-sections through various embodiments of a turbulence generating means 5 of a head box according to the invention.
  • FIGS. 25 and 27 respectively show horizontal and partial longitudinal sections through the turbulence generating means 5 of FIGS. 24 and 26.
  • the flow channels 6.A of the turbulence generating means 5 arranged in columns S.A. are in turn at least partially and symmetrically completely circumscribed by the fluid 10 guided in the means 9 on the outside.
  • the means 9 for metering the fluid 10 into a plurality of flow channels 6A arranged in gaps SA is a fluid distribution chamber 14 having a preferably rectangular, in particular square, cross-sectional area QM, viewed in the flow direction F (arrow) of the fluid 10.
  • the cross-sectional area QM of the agent 9 tapers continuously in the flow direction F (arrow) of the one fluid 10.
  • the cross-sectional area QM of the agent can also taper in sections continuously and / or abruptly.
  • the means 9 is designed in such a way that it flows completely around the flow channels 6.A arranged in a column SA at least in sections, symmetrically and on the outside.
  • the means 9 in the embodiment of FIG. 26 is designed such that there are two in each case one column SA arranged flow channels 6.A at least in parts, asymmetric and outside completely flows around.
  • the respective metering opening 11 is arranged in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A.
  • the turbulence generating means 5 may comprise at least one turbulence generating block and the means may be formed as part of the turbulence generating block, as shown for example in FIGS. 3 to 28 with the exception of FIGS. 25 and 27.
  • the turbulence generating means 5 may again comprise at least one turbulence generating block, but as shown in FIGS. 25 and 27, the means 9 may be formed as part of a component arranged upstream of the turbulence generating block.
  • the arrangement can be made directly, ie directly (FIGS. 25 and 27), or indirectly, ie by means of a preferably machine-wide chamber.
  • FIG. 28 shows a schematic partial sectional view of an embodiment of a turbulence generating means 5 of a head box according to the invention.
  • the flow channels 6 into which at least one fluid 10 is supplied by the means 9 are not arranged in a single column S.A. Rather, the flow channels 6 receiving through fluid 10 extend over a plurality of gaps, wherein the means 9 extends at an angle ⁇ to the gaps S.A.
  • the angle ⁇ may assume different values depending on the design of the turbulence generating means 5.
  • the flow channels 6 of the respective fluid 10 can be at least partially, but also completely enveloped.
  • FIGS. 3 to 28 may also be combined, at least in part, with one another in a manner which is obvious to the person skilled in the art.
  • the headbox described in Figures 3 to 28 is particularly suitable for use in a machine for producing a fibrous web, in particular paper or board web.
  • the invention provides a headbox of the type mentioned, which allows a largely independent metered addition of the additional fluid at the desired total volume constancy of the individual, formed from the pulp suspension partial flow and partial fluid flow partial stream.

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EP06123354A 2005-11-30 2006-11-02 Caisse de tête d'une machine de fabrication d'une bande fibreuse Withdrawn EP1793035A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510000172 DE102005000172A1 (de) 2005-11-30 2005-11-30 Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn

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EP1793035A2 true EP1793035A2 (fr) 2007-06-06
EP1793035A3 EP1793035A3 (fr) 2011-06-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102216521A (zh) * 2008-12-18 2011-10-12 福伊特专利公司 用于制造纤维材料幅材的机器的流浆箱

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4437181A1 (de) * 1994-10-18 1995-03-16 Escher Wyss Gmbh Stoffauflauf für eine Papiermaschine
WO1998046823A1 (fr) * 1997-04-14 1998-10-22 Vaahto Oy Procede et dispositif servant a reguler un debit dans la caisse d'arrivee d'une machine a papier
WO2005024127A1 (fr) * 2003-09-09 2005-03-17 Metso Paper, Inc. Appareil connecte a la caisse d'arrivee d'une machine a papier ou analogue

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4437181A1 (de) * 1994-10-18 1995-03-16 Escher Wyss Gmbh Stoffauflauf für eine Papiermaschine
WO1998046823A1 (fr) * 1997-04-14 1998-10-22 Vaahto Oy Procede et dispositif servant a reguler un debit dans la caisse d'arrivee d'une machine a papier
WO2005024127A1 (fr) * 2003-09-09 2005-03-17 Metso Paper, Inc. Appareil connecte a la caisse d'arrivee d'une machine a papier ou analogue

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102216521A (zh) * 2008-12-18 2011-10-12 福伊特专利公司 用于制造纤维材料幅材的机器的流浆箱
CN102216521B (zh) * 2008-12-18 2014-05-14 福伊特专利公司 用于制造纤维材料幅材的机器及流浆箱

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Publication number Publication date
DE102005000172A1 (de) 2007-06-14
EP1793035A3 (fr) 2011-06-29

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