EP2585633A2 - Stoffauflauf für eine maschine zur herstellung einer faserstoffbahn - Google Patents
Stoffauflauf für eine maschine zur herstellung einer faserstoffbahnInfo
- Publication number
- EP2585633A2 EP2585633A2 EP11710757.3A EP11710757A EP2585633A2 EP 2585633 A2 EP2585633 A2 EP 2585633A2 EP 11710757 A EP11710757 A EP 11710757A EP 2585633 A2 EP2585633 A2 EP 2585633A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- headbox
- cross
- pressure loss
- intermediate channel
- generating means
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title abstract 4
- 239000000725 suspension Substances 0.000 claims abstract description 70
- 239000000123 paper Substances 0.000 claims abstract description 15
- 238000009826 distribution Methods 0.000 claims description 52
- 239000012530 fluid Substances 0.000 claims description 27
- 239000000835 fiber Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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
-
- 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
- D21F1/06—Regulating pulp flow
-
- 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
- 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 packaging paper web, from at least one pulp suspension, comprising a supplying the at least one pulp suspension and a transverse distributor tube feeding device, with a downstream and a plurality of in line and in column flow channels having manifold hole plate, with a downstream, extending across the width of the headbox intermediate channel, with a downstream turbulence generating means having a plurality of in-line and in column flow channels, and with the turbulence generating with - headbox immediately adjacent and having a nozzle gap.
- Such a headbox is known for example from the document DE 198 43 729 A1.
- the pulp suspension coming from a constant part known to the person skilled in the art is led through the transverse distribution tube, then deflected in front of or in the distributor tube plate in the machine direction (MD), separated and fed to the machine-width intermediate channel.
- MD machine direction
- the flow ie at least the pulp suspension is uniformed, any added dilution water, in particular white water, is mixed in and the entire suspension is fluidized.
- a very good throughput constancy by the turbulence-generating means must be achieved in the headbox-free jet, and the suspension is finally accelerated to machine speed in the headbox nozzle.
- a disadvantage of such a headbox is that its transverse distribution pipe is provided with a return system for excess fibrous stock suspension (compare FIG.
- This feedback system usually has a return line and a flow control, comprising a control unit including at least one sensor (pressure sensor), at least one actuator (spool) and various lines on.
- a return system causes incalculable costs in both purchase, operation and maintenance, and it is also sluggish in function and prone to repairs.
- the document DE 102 08 610 A1 already discloses a headbox whose pressure loss in the turbulence generating means is greater than 0.3 bar, preferably greater than 0.2 bar, and whose transverse distribution tube has a cross section tapering in the flow direction of the pulp suspension and only in the region its largest cross-section is connected to a supply line for the pulp suspension.
- the pulp suspension fed to the transverse distribution tube is discharged exclusively via the headbox nozzle.
- the disadvantageous recycling system for excess pulp suspension can be avoided with such a headbox, the technical implementation of such a headbox is more than difficult. In particular, this in turn can have a high energy consumption and an unstable fiber orientation (transverse) profile. It is therefore an object of the invention to improve a headbox of the type mentioned in such a way that the aforementioned disadvantages of the prior art as far as possible, preferably completely eliminated.
- the pressure loss for preferably uniform distribution of the pulp suspension should be as low as possible and optimally distributed.
- the energy consumption of the headbox should be noticeably reduced, the stability of the fiber orientation (cross) profile improved and the consumption of chemicals, especially retention aids, reduced.
- a system pressure loss is provided, which is composed essentially of a first pressure loss between the feeder and the intermediate channel and a second pressure loss in the turbulence generating means, wherein the first pressure loss is a value in Range of 15 to 85%, preferably from 25 to 85%, in particular from 40 to 85%, assumes that the intermediate channel disposed between the Verteilrohrlochplatte and the turbulence generating means a free intermediate channel length of> 50 mm, preferably> 120 mm, in particular of> 200 mm, and in that the cross-sectional ratio between inlet and intermediate channel assumes a value in the range from 0.1 to 2, preferably from 0.15 to 1.5, in particular from 0.2 to 1.
- the inventive design of the headbox of the type mentioned provides a most extensive, preferably complete avoidance of the aforementioned disadvantages of the prior art and a significantly improved fulfillment of particular technological requirements.
- the headbox according to the invention achieves a flow in the cross-machine direction as constant as possible inflow of pulp suspension in the headbox. This is mainly made possible by the fact that its operation takes place without recirculation, a special pressure loss distribution between its Headbox areas prevail and between the two grids, so the Verteilrohrlochplatte and the turbulence generating means, a minimum distance, ie a minimum length of the intermediate channel is present. And the aspect ratio between inlet and intermediate channel favors a very good transverse distribution of at least one pulp suspension in the width direction of the head box according to the invention.
- the cross-section of the inlet is the largest cross-sectional area of the feeder, ie the initial cross-section of the feeder, in particular the cross-divider, whereas the cross-section of the intermediate channel is by definition the free cross-sectional area of the machine-width intermediate chamber, ie the downstream total area of the distribution well plate.
- at least one, well-known to those skilled separator, in particular a blade be arranged. If a plurality of separating elements, in particular lamellae, are arranged in the headbox of the headbox according to the invention, then they can have different lengths and possibly also different properties, such as surface contours and the like.
- the second pressure loss in the turbulence-generating means of the head box according to the invention preferably assumes a value in the range from 0.1 to 1.5 bar, preferably from 0.2 to 1.0 bar, in particular from 0.3 to 0.5. This region for the second pressure loss is particularly advantageous with regard to a good and procedurally necessary fluidization of the pulp suspension.
- the head box according to the invention is preferably provided with hydraulic elements for pressure recovery, such as diffusers, stage diffusers or short diffusers.
- This flow guidance allows a trouble-free and clog-free inflow from the transverse distributor. pipe into the distribution well plate at a speed of 4-16 m / s. The necessary flow energy must be converted back into pressure energy through the diffusers in the distribution well plate.
- the at least one pulp suspension fed to the feed device of the head box according to the invention is preferably fed exclusively to the downstream flow channels of the distribution tube hole plate.
- the cross section of the transverse distribution tube which tapers in the direction of flow of the fibrous suspension and the connection of the supply line for the fibrous suspension in the region of the largest cross section of the distributor ensure that the fibrous suspension is fed to the distribution well plate under approximately equal pressures.
- further means in line with the substance, are means spaced apart from one another for preferably controllably metered addition of a fluid into partial fluid streams into the at least one Fiber suspension provided, wherein the individual means each comprises a plurality of a respective Zudosierkanalö réelle and opening centerline having, at different heights and opening connected to a common supply channel Zudosierkanäle.
- This embodiment allows the realization of a technically simple and reliable Zudosiersystems, which is also still inexpensive and technically relatively 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.
- the impact point of the opening center line of the individual Zudosierkanalö réelle on the turbulence generating means is preferably approximately centrally, preferably centrally between the two column planes of two adjacent flow channels.
- the Zudosierkanalötician the means for preferably controllable / metered addition of the fluid in partial fluid streams at least one pulp suspension to the turbulence generating means of the headbox according to the invention preferably a sen perpendicular distance in the range of 2 to 50 mm, preferably from 3 to 40 mm, in particular from 5 up to 20 mm, on. This distance ranges ensure the necessary mixing quality of the fluid with the pulp suspension, even with different operating parameters, so that the best conditions for the production of a fibrous web with good to very good quality characteristics are given.
- the respective means for preferably regulatable / controllable metering of the fluid in partial fluid streams into the at least one fibrous suspension preferably comprises an injector, as also described in German patent application DE 10 2008 054 898.7 dated 18.12.2008 (Applicant's file: HPA14265 DE - " MJ II-DoS-TE geometry "), the disclosure of which is hereby made the subject of the present description.
- the fluid preferably consists of water, in particular white water or clear water, or of at least one pulp suspension whose concentration differs from the average concentration of the at least one pulp suspension flowing in the headbox.
- the transverse distribution tube of the headbox according to the invention preferably has at least one removable component in the region of its preferably smallest end-side cross-section, the removable component preferably having a rectangular cross-section. This removable component greatly enhances the ease of maintenance and cleaning of the headbox. Due to the preferably rectangular cross section, the hydraulic height of the component is maintained. As a result, the reduction of the cross section is only uniaxial.
- the component is also preferably designed as a hinged part and connected to the transverse distribution tube by means of at least one articulated connection and associated attachment.
- the articulation is upstream, downstream or side mounted.
- Such a hinge connection belongs to the well-known state of the art and has already proven itself in many diverse applications.
- the component may of course also be connected to the distributor by means of a plurality of screw connections or by means of a plurality of slide connections.
- the component is designed according to a further aspect of the invention as a cleaning access for the distributor and / or as a sampling point for Faserstoffsuspen- sion.
- These embodiments are characterized in particular by a practical benefit; So they are beneficial in many ways.
- the head box according to the invention can also be designed as a multi-layer headbox with at least one separating element.
- a multilayer fibrous web having different layer qualities, in particular higher-quality outer layers, can be produced.
- the at least one separating element of the multi-layer headbox can have a minimum rigidity both in the longitudinal direction and in the transverse direction, which assumes at least a value of> 40 N / mm in some areas.
- a flutter and / or a curvature of the at least one in the fabric running nozzle arranged separating element effectively avoided at least during operation of the multi-layer casserole and favors the production of a fibrous web with improved properties.
- the headbox according to the invention is outstandingly suitable for use in a machine for producing a fibrous web, in particular paper, cardboard or packaging paper 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, it is possible to control both its fiber orientation transverse profile and its basis weight transverse profile.
- Figure 1 is a vertical and schematic longitudinal sectional view of a first preferred embodiment of a head box according to the invention for a machine for producing a fibrous web from at least one pulp suspension;
- Figure 2 is a vertical longitudinal section of a preferred
- Embodiment of a distribution well plate of a head box according to the invention Embodiment of a distribution well plate of a head box according to the invention.
- Figure 3 is a vertical and schematic longitudinal sectional view of a second preferred embodiment of a headbox according to the invention for a machine for producing a fibrous web from at least one pulp suspension;
- Figure 4 is a schematic side view of the means for preferably controllable metered addition of a fluid of the headbox according to the invention shown in Figure 3;
- Figure 5 is a horizontal, partial and schematic longitudinal sectional view of the head box according to the invention shown in Figure 3;
- FIG. 6 shows a schematic front view of a preferred embodiment of a transverse distributor tube of a head box according to the invention
- Figure 7 is a schematic side view of a preferred embodiment of a transverse distribution tube of a head box according to the invention.
- FIG. 8 shows an exemplary pressure profile in a feed device, in particular in a transverse distributor tube of a device according to the invention
- Headbox for a machine for producing a fibrous web from at least one pulp suspension.
- FIG. 1 shows a vertical and schematic longitudinal sectional view of a first preferred embodiment of a headbox 1 according to the invention for a machine for producing a fibrous web 3 from a pulp suspension 2 (arrow).
- the illustrated head box 1 according to the invention can of course also be designed as a multilayer headbox, which uses at least two different pulp suspensions for producing the fiber web 3.
- the fibrous web 3 may in particular be a paper, board or packaging paper web.
- the headbox 1 has a feed device 4 feeding the pulp suspension 2 (arrow) in the form of a transverse distributor tube 4.1 known to the person skilled in the art.
- the feed device 4 is followed downstream by a Verteilrohrlochplatte 5, which has a plurality of arranged in rows Z and in columns S flow channels 6.
- a Verteilrohrlochplatte 5 which has a plurality of arranged in rows Z and in columns S flow channels 6.
- an intermediate channel 7 extending across the width B (arrow) of the head box 1 according to the invention adjoins.
- a turbulence generating means 8 Downstream of the intermediate channel 7 is a turbulence generating means 8 having a plurality of flow channels 9 arranged in rows Z and columns S.
- the pulp suspension 2 (arrow) in the turbulence generating means 8 is divided into pulp suspension partial streams and exits after exiting the turbulence generating means 8 in a machine-width chamber 10 in an embodiment of a nozzle gap 12 having headbox nozzle 1 1 merged again to allow the formation of a machine-wide fibrous web 3.
- the flow channels 9 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 expert well known and not explicitly illustrated separating element, in particular a blade be arranged. If a plurality of separating elements, in particular lamellae, are arranged in the headbox nozzle 1 1, they can have different lengths and possibly also different properties, such as surface contours and the like.
- the headbox nozzle 1 1 kan n on the outlet side m on the one hand m with a dashed lines indicated aperture 13 may be provided.
- a system pressure loss p s is now provided, which essentially comprises a first pressure loss p, between the supply device 4 and the intermediate channel 7 and a second pressure loss p 2 in the turbulence generating means 8.
- the first pressure loss pi takes a value in the range of 15 to 85%, preferably 25 to 85%, in particular from 40 to 85%
- the second pressure loss p 2 in the turbulence generating means 8 has a value in the range from 0.1 to 1.5 bar, preferably from 0.2 to 1.0 bar, in particular 0.3 to 0.5 bar, assumes (see also Figure 3).
- the intermediate channel 7 arranged between the distribution tube perforated plate 5 and the turbulence generating means 8 has a free intermediate channel length 7.L of> 50 mm, preferably of> 120 mm, in particular of> 200 mm.
- the intermediate channel 7 is designed with a machine width (compare also FIG. 3).
- the cross-sectional ratio Q between inlet 4.Z and intermediate channel 7 furthermore assumes a value in the range from 0.1 to 2, preferably from 0.15 to 1.5, in particular from 0.2 to 1 (see also FIG. ,
- the cross-section 4.Q of the inlet 4.Z is by definition the largest cross-sectional area 4.Q max of the feed device 4, ie the initial cross-sectional area 4.Q max of the feed device 4, in particular the transverse distribution tube 4.1, whereas the cross-section 7.Q of the intermediate channel 7 by definition, the free quench surface 7Q is free of the machine-width intermediate chamber 7, that is to say the downstream total area 5.F of the distribution pipe perforated plate 5.
- FIG. 2 shows a vertical longitudinal section of a preferred embodiment of a distribution well plate 5 of a headbox 1 according to the invention for a machine for producing a fibrous web from a pulp suspension with different channel segments 6.Q.
- a distribution well plate 5 can be used, for example, in the inventive headbox 1 shown in Figure 1.
- the distribution well plate 5 has, for example, five rows Z1 to Z5 on flow channels 6 and a plurality of gaps S on flow channels 6. All flow channels 6 have a consistently round channel cross section 6.Q, but in different shapes and configurations. Also, all flow channels 6 are provided on the inlet side with a respective intake chamfer 14 known to those skilled in the art.
- the flow channels 6 of the two upper lines Z4, Z5 initially have a constant channel cross section 6.Q, which ultimately undergoes a continuous enlargement 15, in particular a cone 15.1 with a cone angle ⁇ of ⁇ 30 °.
- the flow channel 6 of the middle row Z3 initially again has a constant channel cross section 6.Q, which ultimately experiences two jump-like extensions 16, in particular increments 16.1, 16.2.
- the flow channels 6 of the two lower rows Z1, Z2 initially again have a constant channel cross section 6.Q, which ultimately experiences only a jump-type extension 17, in particular a step jump 17.1.
- Each individual flow channel 6 of the distribution well plate 5 thus has at least initially a round channel cross section 6.Q with a channel diameter 6.D and then ultimately forms at least one diffuser 18 due to at least one extension 15, 16, 17.
- the mean channel diameter 6. DM of the individual flow channel 6 of the distribution well plate 5 and the length 5.L of the Partial hole plate 5 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 distribution well plate 5 is therefore provided in the manner set forth with hydraulic elements for pressure recovery, such as, for example, diffusers 18, stages, iffusors or short diffusers.
- FIG. 3 now shows a vertical and schematic longitudinal section of a second preferred embodiment of a headbox 1 according to the invention for a machine for producing a fibrous web 3 from a fibrous suspension 2 (arrow).
- the illustrated head box 1 according to the invention can of course also be designed as a multilayer 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 packaging paper web.
- the illustrated head box 1 according to the invention corresponds in essential areas to the headbox 1 according to the invention shown in FIG. 1, reference is made to the description and illustration thereof.
- spaced apart means 19 for preferably controllable metered addition of a fluid 20th (Arrow) in partial fluid streams 20.
- T (arrows) provided in the pulp suspension 2 (arrow).
- the individual means 19 each comprise a plurality of a respective metering channel opening 21 .0 and opening center line 21.
- the Zudosierkanalö réelle 21 .0 of the individual means 19 for preferably controllable Zordostechnik has to the turbulence generating means 8 a vertical distance A in the range of 2 to 50 mm, preferably from 3 to 40 mm, in particular from 5 to 20 mm.
- the means 19 for preferably controllable metered addition preferably have a pitch width TB of N x 25 mm or N x 33.3 mm, wherein N is preferably a natural number.
- the respective means 19 for preferably regulatable / controllable metering is designed as an injector 19.1.
- the fluid 20 (Peil) consists of water, in particular white water or clear water, or of at least one pulp suspension whose concentration differs from the average concentration of the at least one flowing in the headbox according to the invention pulp suspension.
- FIG. 4 shows a schematic side view of the middle part 1 to preferably metered / controllable metered addition of a fluid 20 (arrow) of the inventive head box 1 shown in FIG. 3 for a machine for producing a fibrous web from a pulp suspension.
- the metering channels 21 of the means 19 for preferably controllable metering, which discharge at different heights, are arranged at equal intervals D, and the common supply channel 22 of the metering means 19 preferably has a circular cross-sectional area 22. Q with a diameter 22. D from 6 to 20 mm, preferably from 10 to 15 mm, on.
- the metering channel 21 of the means 19 for preferably controllable metering connected to the common supply channel 22 moreover has a circular cross-sectional area 21 .Q with a diameter 21 .D of 2 to 10 mm, preferably 4 to 6 mm.
- the designed as an injector 19.1 means 19 for preferably controllable metered addition has a length 19.L in the range of 60 to 350 mm, preferably from 100 to 250 mm, and depending on the height of the intermediate chamber of the head box 1 according to the invention a height nineteenth .H in the range of 50 to 300 mm, preferably from 75 to 250 mm.
- the means 19 for preferably controllable metered addition preferably have a pitch width TB of N x 25 mm or N x 33.3 mm, wherein N is preferably a natural number.
- the injector 19.1 is also disclosed in German Patent Application DE 1 0 2008 054 898.7 dated Dec. 18, 2008 (Applicant's File: HPA14265 DE - "MJ M-DoS-TE Geometry”) The disclosure of which is incorporated herein by reference made.
- FIG. 5 shows a horizontal, partial and schematic longitudinal sectional view of the inventive headbox 1 shown in FIG. 3 for a machine for producing a fibrous web 3 from a fibrous stock suspension 2 (arrow).
- the headbox 1 comprises the feeding device 4 feeding the pulp suspension 2 (arrow) in the form of a transverse dividing pipe 4.1 known to the person skilled in the art.
- the feed device 4 closes downstream of the Verteilrohrlochplatte 5, which has a plurality of arranged in rows Z and in columns S flow channels 6.
- the over the width B (double arrow) of the head box 1 according to the invention extending intermediate channel 7 connects.
- Downstream of the intermediate channel 7 is the turbulence generating means 8 having a plurality of flow channels 9 arranged in rows Z and in gaps S. And the turbulence generating means 8 is immediately followed by the headbox 1 having the nozzle gap 12.
- the intermediate channel 7 are several in the width direction Y (double arrow) of the headbox 1 according to the invention spaced apart means 1 9 for preferably controllable / metered metering of the fluid 20 (arrow) in partial fluid streams 20.
- T (arrows) in the pulp suspension 2 ( Arrow) provided.
- the individual means 19 each comprise a plurality of a respective metering channel opening 21 .0 and opening center line 21. M having Zudosierkanäle 21 (see Figure 4).
- the Zudosierkanalö réelle 21 .0 of the individual means 19 for preferably controllable metered addition to the turbulence generating means 8 has a vertical distance A in the range of 2 to 50 mm, preferably from 3 to 40 mm, in particular from 5 to 20 mm.
- M of the individual metering channel opening 21 onto the turbulence generating means 8 lies approximately centrally, preferably centrally between the two slot planes S1 to S4 of two adjacent flow channels 9.
- the means 19 for preferably controllable metered addition preferably have a pitch width TB of N x 25 mm or N x 33.3 mm, where N is preferably a natural number.
- transverse distribution pipe 4.1 has a cross-section 4.Q tapering in the direction of flow R (arrow) of the pulp suspension 2 and that in the region of its largest cross-section it is connected to a supply line not shown in detail but known to a person skilled in the art Pulp suspension 2 is connected.
- FIG. 6 shows a schematic front view of a preferred embodiment of a transverse distribution tube 4.1, that is to say a delivery device 4 of a headbox 1 according to the invention.
- the transverse distribution tube 4.1 has at least one detachable component 23, which preferably has a rectangular cross section 23.
- the component 23 is designed as a hinged part 23.1, which is connected by means of at least one articulated connection 24 (dash-dot line) and associated attachment to the transverse distribution pipe 4.1.
- the articulation 24 is mounted upstream in the embodiment of FIG 6; However, it can also be mounted downstream or laterally in a further embodiment.
- the component 23, in a non-illustrated construction can also be connected to the distributor by means of a multiplicity of screw connections or by means of a multiplicity of slide connections.
- FIG. 7 shows a schematic side view of a preferred embodiment of a transverse distribution tube 4.1 of a head box 1 according to the invention.
- the transverse distribution tube 4.1 has a cross-section 4.Q tapering in the flow direction R (arrow) of the fibrous suspension 2 and is connected in the region of its largest cross-section 4.Q to an only indicated supply line 25 (arrow) for the fibrous suspension 2. Furthermore, the largest cross-sectional area 4.Qmax of the feed device 4, that is to say the initial cross-sectional area 4.Qmax of the feed device 4, in particular of the transverse distributor tube 4.1, is shown.
- the pulp suspension 2 (arrow) supplied to the transverse distribution pipe 4.1 is supplied exclusively to the downstream flow channels 6 of the distribution pipe perforated plate 5.
- transverse distribution tube 4.1 is shown with a closed and opened component 23 or folding part 23.1, which is connected to the transverse distribution tube 4.1 by means of the articulated connection 24 and associated attachment.
- the Component 23 or folding part 23.1 is preferably designed as a cleaning access and / or as a sampling point.
- FIG. 8 shows an exemplary pressure loss curve in a feed device, in particular in a transverse distributor tube of a headbox according to the invention for a machine for producing a fibrous web from at least one fibrous stock suspension due to acting pipe friction.
- the abscissa shows the distance from the recirculation side in [mm], the longitudinal axis in the ordinate, the velocity in the lateral distribution tube in [m / s] and on the right ordinate the pressure loss dp in [mbar].
- HPA14252 EN - "MJ M Edge Modules"
- HPA14253 EN - "MJ Il Pressure Drop Distribution"
- HPA14263 EN - "MJ II-Slat-Free Excipient Addition"
- HPA14265 EN - "MJ M-DoS-TE Geometry"
- HPA14310 EN - "MJ Il distribution well plate thickness"
- HPA14466 EN - "MJ ll-W-STA"
- the headbox 1 according to the invention which is at least partially illustrated in FIGS. 1 to 7, 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 above is improved by the invention so that the aforementioned disadvantages of the prior art as far as possible, preferably completely eliminated tigt.
- the pressure loss for preferably uniform distribution of the pulp suspension is distributed as low as possible and optimal.
- the energy consumption of the headbox is also noticeably reduced, the stability of the fiber orientation profile is improved, and the consumption of chemicals, in particular retention agents, is reduced.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010030352 DE102010030352A1 (de) | 2010-06-22 | 2010-06-22 | Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn |
PCT/EP2011/054420 WO2011160865A2 (de) | 2010-06-22 | 2011-03-23 | Stoffauflauf für eine maschine zur herstellung einer faserstoffbahn |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2585633A2 true EP2585633A2 (de) | 2013-05-01 |
EP2585633B1 EP2585633B1 (de) | 2014-07-16 |
Family
ID=44625559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11710757.3A Active EP2585633B1 (de) | 2010-06-22 | 2011-03-23 | Stoffauflauf für eine maschine zur herstellung einer faserstoffbahn |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2585633B1 (de) |
CN (1) | CN102947504B (de) |
DE (1) | DE102010030352A1 (de) |
WO (1) | WO2011160865A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103422384B (zh) * | 2013-08-08 | 2015-04-22 | 华南理工大学 | 一种可进行流场测量和可视化研究的水力式实验流浆箱 |
WO2019195973A1 (zh) * | 2018-04-09 | 2019-10-17 | 华南理工大学 | 用于长纤维造纸的低速水力式流浆箱 |
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DE19843729A1 (de) * | 1998-09-24 | 2000-03-30 | Voith Sulzer Papiertech Patent | Verfahren und Vorrichtung zur Verbesserung des Schrumpfungs-Querprofils |
DE19908898A1 (de) * | 1999-03-02 | 2000-09-07 | Voith Sulzer Papiertech Patent | Verfahren zur Zudosierung eines fluiden Mediums in einen Suspensionsstrom eines Stoffauflaufes und Stoffauflauf |
DE10208610B4 (de) | 2002-02-27 | 2014-03-06 | Voith Patent Gmbh | Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf |
DE102004000069A1 (de) * | 2004-12-30 | 2006-07-13 | Voith Paper Patent Gmbh | Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn |
DE102008054894A1 (de) | 2008-12-18 | 2010-07-01 | Voith Patent Gmbh | Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn |
DE102008054899A1 (de) | 2008-12-18 | 2010-06-24 | 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 |
DE102008054897A1 (de) | 2008-12-18 | 2010-07-01 | Voith Patent Gmbh | Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn |
DE102008054893A1 (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 |
DE102009027721A1 (de) | 2009-07-15 | 2011-01-20 | Voith Patent Gmbh | Stoffauflauf für eine Maschine zur Herstellung einer Fasterstoffbahn |
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2010
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EP2585633B1 (de) | 2014-07-16 |
WO2011160865A3 (de) | 2012-02-23 |
WO2011160865A2 (de) | 2011-12-29 |
DE102010030352A1 (de) | 2011-12-22 |
CN102947504B (zh) | 2015-04-15 |
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