EP1676950A1 - Caisse de tête pour machine de fabrication d'une bande fibreuse, une bande de papier ou de carton - Google Patents

Caisse de tête pour machine de fabrication d'une bande fibreuse, une bande de papier ou de carton Download PDF

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Publication number
EP1676950A1
EP1676950A1 EP05112196A EP05112196A EP1676950A1 EP 1676950 A1 EP1676950 A1 EP 1676950A1 EP 05112196 A EP05112196 A EP 05112196A EP 05112196 A EP05112196 A EP 05112196A EP 1676950 A1 EP1676950 A1 EP 1676950A1
Authority
EP
European Patent Office
Prior art keywords
headbox
flow
channels
intermediate chamber
guide
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
Application number
EP05112196A
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German (de)
English (en)
Other versions
EP1676950B1 (fr
Inventor
Wolfgang Ruf
Hans Loser
Klaus Lehleiter
Konstantin Fenkl
Karl Bunz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Voith Paper Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH, Voith Paper Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1676950A1 publication Critical patent/EP1676950A1/fr
Application granted granted Critical
Publication of EP1676950B1 publication Critical patent/EP1676950B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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

Definitions

  • the invention relates to a headbox for a machine for producing a fibrous web, in particular a paper or board web, with at least one distributor device for distributing at least one fibrous stock suspension across the machine width, with a first guide device having a plurality of channels, with a second, a plurality of channels having guide means, with an intermediate chamber therebetween, with a headbox adjoining the second guide means, which is provided with an outlet slit supplying a pulp suspension jet, and with a plurality of distributed over the machine width supply lines for a zuzumischendes fluid.
  • Such a headbox is known for example from German patent application DE 44 16 899 A1.
  • the admixture of the fluid with multiple distributed over the machine width supply lines directly into the machine-width intermediate chamber of the headbox.
  • the added fluid streams mix with the pulp suspension to partial mixing streams.
  • this design has the aerodynamic disadvantage that coarse turbulence structures arise in the pulp suspension in the region of the machine-width intermediate chamber which can lead to turbulence of the individual partial mixing streams.
  • German Patent DE 40 19 593 C2 the admixture of the fluid sectionally via supply lines in the machine-width intermediate chamber upstream mixing chambers, so-called Dilution facilities to perform.
  • Dilution facilities to perform.
  • the divisions of the dilution devices are not independent of the number of lines. This creates an unequal response breadth.
  • it should have a reduced and constant effective response width, effect a good mixing of the partial mixing streams in their z-direction, ensure a constancy of the partial volume flow independently of the partial fluid flow and enable retrofitting to existing systems.
  • the supply lines preferably open directly on the upper side, lower side and / or front side into the upstream region of the intermediate chamber and that the intermediate chamber is subdivided by means of a plurality of flow dividers arranged across the machine width and forming flow channels at least in sections with respect to their longitudinal direction, in that at least one first intermediate chamber is formed upstream.
  • the top, bottom and / or end mouth of the supply lines in the upstream region of the intermediate chamber provides, among other things, a maximum of flexibility in terms of divisions of different construction and functional groups and also allows cost-effective retrofitting to existing facilities, since only minor changes, in particular attachment of Holes ("one-hole dosages") and the like, must be made on the existing system.
  • a reduction and constant maintenance of the response range is also positively supported.
  • the flow channels cause due to the division of the mixed streams in smaller volume partial mixing streams a good mixing of the same in their z-direction. And last but not least, a constancy of the volume partial flow is ensured independently of the partial fluid flow.
  • the flow divider also causes a pressure drop in the range of 01, to 5 bar, preferably from 0.2 to 1 bar, which in turn results in a largely equalization of the volume partial flows.
  • the supply lines open in the region of the first intermediate chamber on the upper side and / or the lower side in the upstream region of the intermediate chamber.
  • the number of supply lines is equal to or approximately equal to the number of channels of the first guide device. This ensures a direct and individual assignment of a supply line to a channel of the first guide device. A partial flow of the supplied fluid is thus assigned to a partial flow of the at least one pulp suspension. An allocation of the partial flows in the ratio of 1: 1 is provided.
  • both the channels of the first guide device and the flow divider may have a respective pitch, which are the same, approximately the same or different.
  • the number of flow dividers is equal to or approximately equal to the number of channels of the first guide device.
  • the flow dividers are preferably arranged in fluidic extension of the channels of the first guide device. This in turn ensures a direct and individual assignment of a flow divider to a channel of the first guide device.
  • both the flow divider and the channels of the second guide device have a respective pitch, which are the same, approximately the same or different.
  • the pitch of the channels of the second guide means is preferably a fraction of the pitch of the flow dividers.
  • the channels of the second guide device may be aligned symmetrically to the flow dividers, so that a fluidically optimal flow path is formed.
  • the first intermediate chamber preferably has a length in the range of 5 to 500 mm, preferably from 10 to 100 mm, so that a sufficient length for a possible balance in terms of pressure, speed and the like is given.
  • the flow dividers arranged in the intermediate chamber may extend up to or not as far as the second guide device.
  • the flow dividers arranged in the intermediate chamber may be components of the second guide device in terms of mechanical engineering, whereas in the case of possible non-extension, the formed second intermediate chamber may have a length in the range from 1 to 500 mm, preferably from 10 to 100 mm.
  • the first guide device is preferably designed as a perforated plate
  • the second guide device is preferably formed as a turbulence generator, which preferably has a turbulence insert with a plurality of turbulence channels, which are formed in particular by turbulence tubes.
  • turbulence generator which preferably has a turbulence insert with a plurality of turbulence channels, which are formed in particular by turbulence tubes.
  • the flow dividers forming the flow channels have at least in sections arranged structures for preferably homogeneous mixing of the respective partial mixed streams.
  • the flow guide can all be arranged on the circumference of the straightening channel.
  • the oppositely arranged in the respective flow channel structures preferably have a preferably opposite course. This measure has a particularly advantageous effect in terms of achieving a homogeneous mixture of the two partial streams and a best possible flow calming in the partial mixing streams.
  • the desired orientation of the partial mixing streams in the machine direction is favored.
  • the structures arranged in the flow channels comprise a plurality of flow guide elements, which are aligned at least downstream in the machine direction. This outlet-side alignment of the flow guide elements contributes significantly to the desired flow orientation of the partial mixing streams. An inlet-side alignment of the flow guide in the machine direction is desirable, but not essential.
  • the flow guide elements preferably have a respective element height in the range of 5 to 95%, preferably 30 to 70% of the respective clear chamber width.
  • the element heights of at least some, preferably all flow guide elements in the machine direction can increase. These element heights require immersion of the flow guide elements in the partial mixing streams during their mixing, settling and orientation.
  • the arranged in a flow channel flow guide are offset in height from each other, so that it does not come to any collisions and the respective partial mixing current is continuously performed.
  • Two adjacent flow guide elements can have a spacing in the range from 0.2 to 5 ⁇ , preferably from 0.5 to 2 ⁇ , of the respective clear channel width.
  • the flow guide elements have a respective element length in the range from 1 to 20 ⁇ , preferably from 2 to 10 ⁇ , of the respective element height.
  • additional guide means may be arranged, which contribute to the generation of a desired pressure loss in the respective flow channel.
  • the flow channels of the flow divider downstream preferably have a respective widening cross-section, so that a gradual transition into the machine-width second intermediate chamber, if present, is given.
  • the inventive machine for producing a fibrous web in particular paper and / or board web, is characterized in that it is provided with a head box according to the invention.
  • the fibrous web may in particular be a paper or board web.
  • the headbox 1 has a distributor 2 for distributing a pulp suspension 3, in particular a highly consistent pulp suspension, across the machine width MB (double arrow).
  • the distributor 2 is in the embodiment of Figure 1, a transverse distribution tube 2.1; In a further embodiment, it can also be designed as a rotary distributor with a plurality of inlet hoses.
  • the headbox comprises a first, a plurality of channels 5 having guide means 4, a second, a plurality of channels 7 having guide means 6 and an intermediate chamber located therebetween 8.
  • the second guide means 6 is followed by a headbox 9, which with a a Pulp suspension jet 11 supplying exit slit 10 is provided.
  • the headbox 1 has a plurality of across the machine width MB (double arrow) away and only schematically shown supply lines 12 for zuzumischendes fluid 13.
  • the fluid 13 may be a low-consistency pulp suspension, in particular white water, and / or fresh water.
  • the feed lines 12 now preferably open directly on the upper side into the upstream region 14 of the intermediate chamber 8 and the intermediate chamber 8 is divided by means of several across the machine width MB (double arrow) away and flow channels 16 forming flow dividers 15 at least in sections with respect to their longitudinal direction L (arrow) such that upstream of at least a first intermediate chamber 17 is formed.
  • the flow dividers 15 divide the pulp suspension stream and optionally also the fluid stream into common individual streams.
  • the supply lines 12 open centrally and upstream between the flow channels 16 of the flow dividers 15 into the first intermediate chamber 17.
  • the first guide device 4 is designed as a perforated plate 18, whereas the second guide device 6 is designed as a turbulence generator 19 (see FIG. 5) which preferably has a turbulence insert 20 with a multiplicity of turbulence channels 21, which are formed in particular by turbulence tubes 22.
  • the second guide means 6 designed as a turbulence generator 19 is shown only schematically, since such a turbulence generator 19 is well known in the art.
  • FIG. 2 shows a partial detail view of the first intermediate chamber 17 together with adjacent assemblies of FIG. 1, namely the first guide device 4 with the channels 5, the first intermediate chamber 17 and the flow divider 15 with the flow channels 16.
  • This figure shows an example of the possible mouth locations of the supply lines 12, which preferably open directly on the top, bottom and / or end into the upstream region 14 of the intermediate chamber 8.
  • the supply line 12 may be in extension and / or approximately in extension of the channel 5 of the first guide means 4 (dashed position A) and / or preferably symmetrically between the channels 5 of the first guide means 4 (dashed position B) on the top and / or bottom in the upstream Area 14 of the intermediate chamber 8 open. Also, the supply line 12 in the preferably upstream region 23 of the Flow channel 16 of the flow divider 15 (dashed position C) open on the upper side and / or underside in the upstream region 14 of the intermediate chamber 8. It can also open centrally or approximately centrally between the flow channel 16 of the flow divider 15 (position D) on the upper side and / or the lower side in the upstream region 14 of the intermediate chamber 8.
  • the supply line 12 can extend at least at the end through the first guide device 4 and open at the end into the upstream region 14 of the intermediate chamber 8 (dashed position E). In this case, it can run centrally or approximately centrally between the channels 5 of the first guide device 4.
  • FIG. 3 shows a partial detail view of the headbox 1 of FIG. 1.
  • both the channels 5 of the first guide device 4 and the flow divider 15 have a respective pitch T KEF , T s , which are the same or approximately equal.
  • the two divisions T KEF , T s can also be different.
  • the number of flow dividers 15 is equal to or approximately equal to the number of channels 5 of the first guide means 4.
  • the flow divider 15 are arranged in fluidic extension of the channels 5 of the first guide means 4, so that for the pulp suspension 3 baffles 24 are formed on the flow dividers 15.
  • both the flow divider 15 and the channels 7 of the second guide means 6 have a respective pitch T s , T KZF , which are equal or approximately equal.
  • the two pitches T s , T KZF as seen in the embodiment of Figure 3, also be different.
  • the pitch T KZF of the channels 7 of the second guide means 6 is a fraction of the pitch T s of the flow divider 15, more precisely half.
  • the channels 7 of the second guide means 6 are aligned symmetrically to the flow dividers 15.
  • the number of supply lines 12 corresponds to the number of channels 5 of the first guide device 4 plus 1.
  • the first intermediate chamber 17 has a length L Z1 in the range of 5 to 500 mm, preferably from 10 to 100 mm.
  • the flow dividers 15 arranged in the intermediate chamber 8 do not extend to the second guide device 6, so that at least one second intermediate chamber 25 is formed downstream.
  • This second intermediate chamber 25 has a length L Z2 in the range of 1 to 500 mm, preferably from 10 to 100 mm.
  • the flow dividers 15 forming the flow channels 16 have structures 26 arranged at least in sections for preferably homogeneous mixing of the respective partial mixing streams (compare FIGS. 6a to 8b).
  • the extension can be continuous and / or unsteady.
  • FIG. 4 again shows a partial detail view of the headbox 1 of FIG. 1, but in an alternative embodiment.
  • the alternative embodiment consists in that the flow dividers 15 arranged in the intermediate chamber 8 extend up to the second guide device 6 and thus no second intermediate chamber is formed.
  • the arranged in the intermediate chamber 8 flow divider 15 are preferably mechanical engineering components of the second guide means 6. Otherwise, the present embodiment corresponds to the embodiment of Figure 3, to which reference is hereby made to this.
  • FIG. 5 shows a schematic sectional view of the headbox 1 of Figure 1 according to section line FF.
  • FIG. 5 shows a schematic sectional view of the headbox 1 of Figure 1 according to section line FF.
  • the possible supply lines 12 can preferably open into the upstream region 14 of the intermediate chamber 8, preferably directly on the upper side, the lower side and / or the front side.
  • the over the machine width MB (arrow) away and flow channels 16 forming flow divider 15 can effectively derive forces, which act on the limiting surfaces of the channel structure, for example, by means of attached connecting elements 27, in particular screws under the prevailing requirement.
  • the flow dividers 15 forming the flow channels 16 have structures 26 arranged at least in sections, for preferably homogeneous mixing of the respective partial mixed streams. In this case, they have, at least in regions, a turbulence-generating corrugated surface structure 28.
  • the first guide device 4 is formed as a perforated plate 18, whereas the second guide device 6 is formed as a turbulence generator 19, which preferably has a turbulence insert 20 with a plurality of turbulence channels 21, which are in particular formed by turbulence tubes 22.
  • the first intermediate chamber 17 has a length L Z1 in the range of 5 to 500 mm, preferably from 10 to 100 mm.
  • the flow dividers 15 arranged in the intermediate chamber 8 do not extend to the second guide device 6, so that at least one second intermediate chamber 25 is formed downstream.
  • This second intermediate chamber 25 has a length L Z2 in the range of 1 to 500 mm, preferably from 10 to 100 mm.
  • FIGS. 6a, 7a and 8a show different views of a flow channel 16 lying between two flow dividers 15 in the machine direction M (arrow), whereas FIGS. 6b, 7b and 8b show different wall views of the flow channels 16 of FIGS. 6a, 7a and 8a.
  • the flow dividers 15 forming the flow channels 16 have structures 26 arranged at least in sections, for preferably homogeneous mixing of the respective partial mixed streams. In this case, they have, at least in regions, a turbulence-generating corrugated surface structure 28, which in the flow channel 16 arranged opposite structures 26, 28 find a preferably opposite course.
  • the flow guide elements 29 shown in these figures have a respective element height H s in the range of 5 to 95%, preferably 30 to 70% of the respective clear channel width B K.
  • the element heights H s of at least some, preferably all, of the flow guide elements 29 in the machine direction M (arrow) increase.
  • the flow guide elements 29 arranged in the flow channel 16 are arranged at least on the two lateral flow dividers 15.
  • the flow guiding elements 29 can all also be arranged on the circumference of the flow channel 16.
  • the flow guiding elements 29 can also have different courses: they can run in a straight line (FIGS. 6a and 6b), curved (FIGS. 7a, 7b, 8a and 8b) or combined.
  • two adjacent flow guide elements 29 have a distance G in the range from 0.2 to 5 ⁇ , preferably from 0.5 to 2 ⁇ , of the respective clear channel width B K.
  • Strömungsleitieri 29 are equal in height (Figure 6a) or height offset from each other ( Figures 7a and 8a) arranged.
  • Figure 6a height offset from each other
  • Figures 7a and 8a height offset from each other
  • the flow guide elements 29 have a respective element length L s in the range from 1 to 20 times, preferably from 2 to 10 times, the respective element height H s .
  • the structure 26 forming the flow guide 29 have the shape of baffles, vanes or the like.
  • the structures 26 arranged opposite one another in the respective flow channel 16 have a preferably opposing course (FIGS. 7b and 8b).
  • the structure 26 of a flow divider 15 may have an upward course, whereas the structure 26 of the other flow divider 15 may have a downward course.
  • the curves can be made straight or curved here.
  • the structures 26 arranged in the respective flow channel 16 have a preferably opposite course to structures arranged upstream.
  • additional guide devices 30 are arranged in the respective flow channel 16 for generating a desired pressure loss.
  • These guide devices 30 are generally in the channel space protruding elements of different geometry and size and they are at least individually arranged between two flow guide 29.
  • the invention provides a headbox of the type mentioned, which no longer has the mentioned disadvantages of the prior art.
  • it has a reduced and constant effective response width, causes a good mixing of the partial mixing streams in their z-direction, ensures a constancy of the volume partial flow independent of the partial fluid flow and allows retrofitting to existing systems.

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  • Paper (AREA)
EP05112196A 2004-12-30 2005-12-15 Caisse de tête pour machine de fabrication d'une bande fibreuse, une bande de papier ou de carton Not-in-force EP1676950B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004000069A DE102004000069A1 (de) 2004-12-30 2004-12-30 Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn

Publications (2)

Publication Number Publication Date
EP1676950A1 true EP1676950A1 (fr) 2006-07-05
EP1676950B1 EP1676950B1 (fr) 2008-03-19

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EP05112196A Not-in-force EP1676950B1 (fr) 2004-12-30 2005-12-15 Caisse de tête pour machine de fabrication d'une bande fibreuse, une bande de papier ou de carton

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EP (1) EP1676950B1 (fr)
AT (1) ATE389743T1 (fr)
DE (2) DE102004000069A1 (fr)

Cited By (3)

* 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
CN102216520A (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
WO2011160865A3 (fr) * 2010-06-22 2012-02-23 Voith Patent Gmbh Caisse de tête pour une machine de production d'une bande de matière fibreuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115298370B (zh) * 2020-03-31 2023-05-02 金伯利-克拉克环球有限公司 用于生产分区和/或分层基材的方法和设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416909A1 (de) * 1994-05-13 1995-11-16 Voith Sulzer Papiermasch Gmbh Verfahren zur lokalen Zumischung von Fluid in einen Stoffauflauf für eine Papiermaschine sowie Stoffauflauf zu seiner Durchführung
DE4416899A1 (de) * 1994-05-13 1995-11-16 Voith Sulzer Papiermasch Gmbh Verfahren zur lokalen Zumischung von Fluid in einen Stoffauflauf sowie Vorrichtung zu seiner Ausführung
DE19705590A1 (de) * 1997-02-14 1998-08-20 Voith Sulzer Papiermasch Gmbh Stoffauflauf einer Papiermaschine
DE10217514A1 (de) * 2002-04-19 2003-11-06 Voith Paper Patent Gmbh Stoffauflauf einer Papier-, Karton- oder Tissuemaschine und Verfahren zur Verbesserung der Eigenschaften einer aus einer Faserstoffsuspension hergestellten Faserstoffbahn
DE10245154A1 (de) * 2002-09-27 2004-04-15 Voith Paper Patent Gmbh Stoffauflauf

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416909A1 (de) * 1994-05-13 1995-11-16 Voith Sulzer Papiermasch Gmbh Verfahren zur lokalen Zumischung von Fluid in einen Stoffauflauf für eine Papiermaschine sowie Stoffauflauf zu seiner Durchführung
DE4416899A1 (de) * 1994-05-13 1995-11-16 Voith Sulzer Papiermasch Gmbh Verfahren zur lokalen Zumischung von Fluid in einen Stoffauflauf sowie Vorrichtung zu seiner Ausführung
DE19705590A1 (de) * 1997-02-14 1998-08-20 Voith Sulzer Papiermasch Gmbh Stoffauflauf einer Papiermaschine
DE10217514A1 (de) * 2002-04-19 2003-11-06 Voith Paper Patent Gmbh Stoffauflauf einer Papier-, Karton- oder Tissuemaschine und Verfahren zur Verbesserung der Eigenschaften einer aus einer Faserstoffsuspension hergestellten Faserstoffbahn
DE10245154A1 (de) * 2002-09-27 2004-04-15 Voith Paper Patent Gmbh Stoffauflauf

Cited By (6)

* 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
CN102216520A (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
WO2011160865A3 (fr) * 2010-06-22 2012-02-23 Voith Patent Gmbh Caisse de tête pour une machine de production d'une bande de matière fibreuse
CN102947504A (zh) * 2010-06-22 2013-02-27 沃依特专利有限责任公司 用于制造纤维料幅的机器的流浆箱
CN102947504B (zh) * 2010-06-22 2015-04-15 沃依特专利有限责任公司 用于制造纤维料幅的机器的流浆箱

Also Published As

Publication number Publication date
EP1676950B1 (fr) 2008-03-19
DE502005003297D1 (de) 2008-04-30
ATE389743T1 (de) 2008-04-15
DE102004000069A1 (de) 2006-07-13

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