EP2215305A1 - Verfahren für die zufuhr von hochkonsistentem zellstoff zu einem herstellungsträger und stoffauflauf für hochkonsistenten zellstoff - Google Patents
Verfahren für die zufuhr von hochkonsistentem zellstoff zu einem herstellungsträger und stoffauflauf für hochkonsistenten zellstoffInfo
- Publication number
- EP2215305A1 EP2215305A1 EP08850448A EP08850448A EP2215305A1 EP 2215305 A1 EP2215305 A1 EP 2215305A1 EP 08850448 A EP08850448 A EP 08850448A EP 08850448 A EP08850448 A EP 08850448A EP 2215305 A1 EP2215305 A1 EP 2215305A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- flow channel
- consistency
- flow
- slice
- 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
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 16
- 239000000835 fiber Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 description 15
- 238000010008 shearing Methods 0.000 description 5
- 238000005243 fluidization Methods 0.000 description 4
- 230000009021 linear effect Effects 0.000 description 4
- 239000011111 cardboard Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 241001052209 Cylinder Species 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- -1 pulp sheets Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000725 suspension Substances 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
Definitions
- the invention relates to a method for feeding high-consistency pulp to a formation support, in which method fibre pulp at the consistency of about 4 to 20% is fed from a slice onto a formation support that is permeable to water, for manufacturing a fibre-based product.
- the invention also relates to a high-consistency pulp headbox, whose inlet part is connected to a source of fibre pulp at the consistency of about 4 to 20%, and whose outlet end forms a slice or the like for feeding said pulp onto a formation support that is permeable to water.
- pulp whose consistency is as high as possible that is, pulp whose fibre solids content is as high as possible and whose water content is thus low, to reduce the quantity of circulating water.
- a problem with the feeding of pulp at a high consistency of 4 to 20% onto the product formation support lies in obtaining a product of uniform quality, because in pulp at such a high consistency, the fibres tend to accumulate in a dense fibre network, and they cannot be evenly distributed on the whole surface area of the product.
- the consistency of such pulp is, in fact, already in a range where a web tends to form when fibres are bound to each other.
- the main task in the feeding of such pulp is to keep the pulp, with respect to its rheological properties, in a "fluid" state similar to water, by preventing the formation of fibre agglomerations and possibly by disintegrating any fibre agglomerations already formed. This is important before the web starts to form onto the formation support, because defects in the pulp can no longer be amended afterwards.
- Patent Fl 86444 to which corresponds, inter alia, patent EP 348398, discloses a roll fitted in the cross-machine direction to rotate in the pressure chamber of the headbox.
- the aim is to subject the pulp at a consistency of 6 to 15% to high shearing forces locally between the rotating surface of the roll and another surface.
- the rotary movement of the roll is also used for feeding pulp in the headbox towards the formation support.
- the method according to the invention is primarily characterized in that before the slice, the pulp is led into a flow channel tapering on at least part of its length in the flow direction and limited by a surface moving at a velocity that is different from the pulp flow velocity, and that the pulp is fed by force into this flow channel by a feeding device, for example a high-consistency pump, that supplies kinetic energy to the pulp and is separate from the moving surface.
- a feeding device for example a high-consistency pump
- the pulp is subjected to shearing forces along its whole path in the flow channel, and good mixing, turbulence and thereby fluidization of the pulp can be maintained up to the slice, from where the pulp is discharged onto a moving formation support, on which the product starts to form simultaneously when water is removed from the pulp through the formation support.
- the surface moving at a speed differing from the pulp rate may be, for example, the peripheral surface of a rotor arranged to rotate in the headbox.
- the peripheral surface of such a rotor forms one limiting surface of a gap tapering in the flow direction, and a second limiting surface is formed by a stationary wall that is opposite to the peripheral surface and is curved in the same direction.
- the turbulence of the pulp is increased by the design of the wall limiting the gap, causing successive constriction points in the pulp flow passage.
- the flow channel forming the tapering gap ends in a slice, up to which the pulp is maintained in a turbulent state.
- the feeding of the pulp into the tapering flow channel, or gap is effected by force with a feeding device that gives the pulp the kinetic energy required by it, for example a high-consistency pump.
- This feeding device is a device functionally separate from the rotating rotor.
- the high-consistency pulp headbox according to the invention is characterized in that the inlet part continues as a flow channel that tapers on at least part of its length, ending in a slice, and that the flow channel is limited by a surface arranged to move at a velocity different from the pulp flow velocity.
- a surface is preferably the peripheral surface of a cylinder arranged to rotate in the headbox.
- Fig. 1 illustrates the general principle of product formation from pulp at a high consistency
- Fig. 2 is a cross-sectional view of a headbox for feeding pulp onto a formation support
- Figs. 3 to 6 show alternative structures for cylinders in the headbox of Fig. 2.
- FIG. 1 shows the principle of manufacturing a product in the form of a continuous web W by the method according to the invention.
- Aqueous fibre suspension in this case high-consistency pulp
- a pulp container M by a pump P via inlet pipe system 3 into a headbox 1.
- the pulp is discharged through a slice onto a formation support 2, such as a wire, that runs continuously forward and is permeable to water.
- the fibre pulp has a consistency of 4 to 20%, in which range the fibre pulp can be called high-consistency pulp.
- the consistency of the pulp is preferably in the range from 5 to 15%.
- the fibre pulp carried along with the formation support 2 is gradually dewatered through the formation support 1 , wherein its dry matter content is increased, and the fibrous product W starts to form into a cohesive texture in which the fibres are arranged in their fixed positions with respect to each other and are bound to each other. Since the water content of the pulp coming from the headbox onto the formation support is relatively low, less water is removed at this step A of web formation than when using pulp of normal consistency, and the quantity of circulating water is reduced.
- the circulating water filtered through the wire is illustrated with an arrow in Fig. 1.
- the web W that is already cohesive without support is guided to a pressing step B, in which it is dewatered by mechanical pressing, and finally into a drying step C, in which water is removed by evaporating with heat.
- the web W formed in this way may be a pulp web, a cardboard web or a paper web.
- Fig. 1 The depiction of Fig. 1 is intended to be illustrative only, and the positions of the various parts and the entries of the formation support 2 and the other means conveying the web W may vary, depending on the machine and on the product to be manufactured.
- Figure 2 shows the structure of the headbox in more detail, in a vertical section taken in the direction of the pulp flow and the running direction of the web to be formed.
- High-consistency pulp is fed into the headbox 1 through the inlet pipe system 3, from above into an inlet part formed by the initial end of the flow channel 4 that tapers gradually towards the slice 5 of the headbox.
- the flow channel 4 is formed between a cylin- der 6 arranged to rotate in a chamber within the headbox and a curved wall 7 opposite to its peripheral surface.
- the wall 7 has a larger radius of curvature than the cylinder, and it approaches the cylinder 6 in the direction of flow of the pulp, resulting in a tapering flow channel with a generally curved form.
- the wall 7 of the flow channel is immobile, even though it may be movable in the direction of radius of the cylinder 6, to adjust the "gap" between the cylinder 6 and the wall 7.
- the cylinder 6 can also be called “rotor”, and the wall 7 immobile with respect to it can also be called “stator”.
- pulp is supplied along the whole length substantially over the machine width, and the terms "nar- rowing” and “tapering” refer in this context to the reduction of the dimensions in a direction perpendicular to the machine width and the flow direction, that is, in the direction of the radii of curvature of the cylinder and the wall.
- the headbox in Fig. 2 illustrates the shape of the flow channel over the whole machine width.
- the flow channel 4 extends in an angle of about 90 degrees with respect to the feeding direction of the inlet flow (inlet direction of the inlet pipe system 3), but this feeding angle may vary within a large range; that is, it may range from 0 to almost 180 degrees.
- the flow channel 4 may thus also start as a direct extension to the inlet pipes 3, or it may extend in a sharper angle than 90 degrees.
- the cylinder 6 does not substantially affect the pulp flow in the flow channel 4 towards the slice 5, but this is obtained by means of an external feeding device. Thanks to this, the rotary movement of the cylinder 6 effectively exerts energy to the pulp flowing towards the slice 5, fluidizing it and preventing the formation of fibre bundles and the fixation of fibres with respect to each other.
- the peripheral surface of the cylinder 6 is provided with a three-dimensional surface pattern; that is, it may comprise, for example, knobs.
- Various alternatives for surface patterning are illustrated in Figures 3 to 6 (Figs. 3 and 5 are elevated views, and Figs. 4 and 6 are perspective views).
- the three-dimensional pattern is formed by successive ridges or elevations 11 in the peripheral direction, and in the case of Figs. 5 and 6, it is formed by separate elevations 12 in the peripheral direction and the axial direction.
- the wall 7 is provided with successive elevations or ridges 7a in the direction of the axis of rotation of the cylinder 6, forming successive constriction or expansion points in the cross-sectional area of the flow.
- the average distance of the wall 7 from the cylinder 6 may be constant, and the design of the wall surface may be used to effectively maintain turbulence also at the terminal end of the flow channel.
- the elevations or ridges may extend in similar configuration over the whole machine width, or they may be discontinuous and staggered. It is also possible that the wall 7 is provided with separate knobs which form a corresponding design to maintain turbulence.
- the rotational speed of the cylinder 6 is dependent on the consistency of the pulp in such a way that the higher the consistency of the pulp to be fed, the higher the rotational speed is to be adjusted. It can be shown that at a certain rotational speed, a fluidization point is achieved, at which the pulp at a given consistency starts to act like water.
- the cylinder 6 or rotor does not have an essential pumping effect, but its function is only to exert shearing forces on the pulp flowing in the channel 4.
- the actual volume flow is produced by a high-consistency pump P that feeds pulp into the headbox 1 , which pump may be a displacement-type pump or a fluidizing pump.
- the pump feeds pulp into the headbox 1 through inlet pipe system 3 without any buffer tank or the like in between.
- the short terminal part 4a of the flow channel following the peripheral surface of the cylinder turns away from the cylinder, forming a short slice channel which ends in the slice 5.
- the turn is about 90°; in other words, the terminal part of the channel is directed away from the cylinder in the direction of the radius of the cylinder, but the turn may be sharper or gentler, greater or smaller than 90°.
- This short terminal part 4a of the flow channel 7 is also curved in the direction opposite to the curvature of the initial part, gradually into the direction of the formation support 2. The pulp is discharged from the slice 5 in a direction opposite to the direction of movement of the periphery of the cylinder 6.
- the flow channel 4 may be arranged in a mirror-like manner with respect to the rotor 6 in Fig. 1 , the position of the slice channel 4a and the running direction of the wire remaining unaltered.
- the figure also shows the path of the formation support 2 that is permeable to water, past the headbox 1.
- the lower surface of the headbox forms a first sliding surface 8 that guides the formation support towards the slice 5 and ends at the lower edge of the slice 5.
- the upper edge of the slice extends as a second sliding surface 9 in the running direction of the formation support 1 , guiding the formation support 2 and the pulp discharged onto it from the slice 5, which pulp immediately begins to form into a web when dewatering starts downwards through the formation support 2.
- the tension of the formation support can be set suitable by means of the position of the sliding surfaces 8 and 9. After the second sliding surface 9, the web W runs on top of the formation support 1 towards the pressing step, as described above.
- the headbox also comprises means sealing the gap between the cylinder 6 and the rest of the headbox outside the flow channel 4, such as doctor blades, which prevent the discharge of the pulp elsewhere. These are indicated with the reference numeral 10 in Fig. 2.
- the machine width may vary within a large range.
- the inlet pipe system 3 can be arranged as a structure to distribute high-consistency pulp evenly in different locations at the initial end of the flow channel 4.
- the diameter of the cylinder or rotor is advantageously 300 to 1200 mm.
- the width of the inlet channel depends, among other things, on the grammage of the product to be manufactured.
- the length of the slice channel 4a is 15 to 50 mm, and the size of its slice is determined by the grammage of the product to be manufactured.
- the invention is suitable, among other things, for feeding fibre pulp into a pulp drying machine, but the invention is not limited solely to machines whose end product is pulp.
- the invention is also suitable for cardboard manufacturing machines and papermaking machines.
- the fibre pulp to be fed from the headbox does not form the entire product, but the headbox may also be placed in a two- ply or multi-ply former, in which one or more fibre layers are attached to the layer formed of the high-consistency pulp.
Landscapes
- Paper (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Forging (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20075811A FI20075811L (fi) | 2007-11-14 | 2007-11-14 | Menetelmä sakean massan syöttämiseksi muodostusalustalle ja sakeamassaperälaatikko |
PCT/FI2008/050653 WO2009063135A1 (en) | 2007-11-14 | 2008-11-13 | A method for feeding high-consistency pulp to a formation support and a high-consistency pulp headbox |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2215305A1 true EP2215305A1 (de) | 2010-08-11 |
EP2215305B1 EP2215305B1 (de) | 2011-06-08 |
Family
ID=38786742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08850448A Not-in-force EP2215305B1 (de) | 2007-11-14 | 2008-11-13 | Verfahren für die zufuhr von hochkonsistentem zellstoff zu einem herstellungsträger und stoffauflauf für hochkonsistenten zellstoff |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2215305B1 (de) |
CN (1) | CN101861427B (de) |
AT (1) | ATE512252T1 (de) |
FI (1) | FI20075811L (de) |
WO (1) | WO2009063135A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103184703B (zh) * | 2013-03-19 | 2015-06-03 | 陕西科技大学 | 一种流浆箱 |
EP2907916A1 (de) * | 2014-02-12 | 2015-08-19 | Mayr-Melnhof Karton AG | Verfahren und Vorrichtung zur Herstellung einer ein- oder mehrlagigen Faserstoffbahn sowie damit hergestellte ein- oder mehrlagige Faserstoffbahn |
GB201614150D0 (en) | 2016-08-18 | 2016-10-05 | Univ Oxford Innovation Ltd | Microfluidic arrangements |
EP3362177A1 (de) | 2015-10-16 | 2018-08-22 | Oxford University Innovation Limited | Mikrofluidische anordnungen |
SE544977C2 (en) * | 2020-04-08 | 2023-02-14 | Valmet Oy | A pulp distribution compartment arrangement and a pulp introduction method for pulp filter equipment |
WO2021243129A1 (en) | 2020-05-29 | 2021-12-02 | Kimberly-Clark Worldwide, Inc. | Headbox for manufacturing a substrate |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3869769D1 (de) * | 1987-01-30 | 1992-05-07 | Ahlstroem Oy | Vorrichtung und verfahren zum ausspreizen von pulpe auf ein band. |
AT404847B (de) * | 1996-06-27 | 1999-03-25 | Andritz Patentverwaltung | Verfahren und vorrichtung zur verteilung einer, insbesondere mittelkonsistenten, faserstoffsuspension |
FI116470B (fi) * | 1999-10-04 | 2005-11-30 | Metso Paper Inc | Menetelmä paperirainan muodostamiseksi |
SE520520C2 (sv) * | 2001-12-05 | 2003-07-22 | Skogsind Tekn Foskningsinst | Metod för att forma en skiktad fibrig bana och en maskin för utförande av denna |
-
2007
- 2007-11-14 FI FI20075811A patent/FI20075811L/fi not_active Application Discontinuation
-
2008
- 2008-11-13 WO PCT/FI2008/050653 patent/WO2009063135A1/en active Application Filing
- 2008-11-13 CN CN2008801160937A patent/CN101861427B/zh not_active Expired - Fee Related
- 2008-11-13 AT AT08850448T patent/ATE512252T1/de active
- 2008-11-13 EP EP08850448A patent/EP2215305B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2009063135A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101861427B (zh) | 2012-06-20 |
FI20075811L (fi) | 2009-05-15 |
FI20075811A0 (fi) | 2007-11-14 |
CN101861427A (zh) | 2010-10-13 |
WO2009063135A1 (en) | 2009-05-22 |
EP2215305B1 (de) | 2011-06-08 |
ATE512252T1 (de) | 2011-06-15 |
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