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EP1645684A1 - Procédé et dispositif pour réguler le profil transversal de grammage d'une bande fibreuse - Google Patents

Procédé et dispositif pour réguler le profil transversal de grammage d'une bande fibreuse Download PDF

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Publication number
EP1645684A1
EP1645684A1 EP05108909A EP05108909A EP1645684A1 EP 1645684 A1 EP1645684 A1 EP 1645684A1 EP 05108909 A EP05108909 A EP 05108909A EP 05108909 A EP05108909 A EP 05108909A EP 1645684 A1 EP1645684 A1 EP 1645684A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
white water
pulp suspension
wire section
feed system
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
EP05108909A
Other languages
German (de)
English (en)
Other versions
EP1645684B1 (fr
Inventor
Klaus Lehleiter
Konstantin Fenkl
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 EP1645684A1 publication Critical patent/EP1645684A1/fr
Application granted granted Critical
Publication of EP1645684B1 publication Critical patent/EP1645684B1/fr
Anticipated expiration legal-status Critical
Not-in-force legal-status Critical Current

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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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • 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 method for controlling the basis weight cross profile of a fibrous web, in particular a paper or board web, in a short cycle at a fibrous web producing and at least one feed system for a high-consistency pulp suspension, a headbox and a wire section having machine, in particular a paper or board machine wherein the high-consistency pulp suspension is fed into the head box by means of the feed system and wherein white water recovered from the wire section is supplied to the high-consistency pulp suspension for dilution by means of a feed system comprising at least one pump.
  • the invention further relates to a device for controlling the basis weight cross profile of a fibrous web according to the preamble of claim 9.
  • headboxes of the type mentioned for example, known from German patent applications DE 40 19 593 C2 and DE 195 09 522 A1, have a dilution water control sometimes for the purpose of regulating the basis weight cross-profile of the fibrous web, wherein a high-consistency pulp suspension has a consistency in the range of 0.1 to 1.5%.
  • This has, inter alia, the consequence that, for a sufficiently good control of the basis weight cross-profile of the fibrous web, large amounts of diluting water, preferably white water recovered in the short cycle of the wire section, have to be added.
  • the European Patent EP 1 155 187 B1 further describes a (post) dilution of a high-consistency pulp suspension with white water recovered from the wire section in a short cycle.
  • the high-consistency pulp suspension has a consistency of at least 1.5% and not more than 4%, and the feeding of the white water by means of a dilution pump directly into the headbox.
  • the sectional control of the material densities is carried out by the sectional control of the feed quantities of highly consistent pulp suspension and white water.
  • the sectional feed quantities are regulated by means of valves arranged in sections.
  • a serious disadvantage of this type of regulation of the basis weight cross-section is that large and expensive control units, which include valves and mixing chambers, among others, are necessary to control only small differences.
  • This object is achieved in a method in that the high-consistency pulp suspension before supplying the serving for dilution white water from the wire section at least from the wire section recovered white water and / or clear water for the purpose of Basistherquerquerprofilierung the fibrous web is preferably controlled by means of a feed system.
  • the advantage is achieved that in the first stage a correction of the basis weight cross profile and in the second stage a dilution with the goal of a consistency across the width of the fibrous web can be achieved.
  • To carry out this two-stage process only small and inexpensive mixing units and minimal amounts of dilution water are needed.
  • At least the white water recovered from the wire section and / or the clear water can preferably be supplied in a regulated manner for the purpose of the basis weight cross-profiling of the fibrous web to form the highly consistent fibrous suspension in the region of its feed system or in the region of the headbox.
  • the realization of the first option is particularly suitable for retrofitting, whereas the realization of the second possibility offers itself in an advantageous manner for new installations.
  • both options are characterized by excellent functionality, good operational reliability and a good cost-benefit ratio.
  • the media is fed to the headbox preferably across its width sectioned.
  • the number of the respective sections for the supplied media is preferably the same.
  • the respective sectioned feed can take place via the respective feed system and / or directly into the headbox.
  • the high consistency pulp suspension preferably has a stock consistency in the range of 1 to 6%, preferably 1.5 to 4.5%. In this area, the function of the method according to the invention is fully guaranteed.
  • the object of the invention is achieved in a device in that a preferably controllable feed system is provided which feeds the high consistency pulp suspension before feeding the white water used for dilution from the wire section at least from the wire section recovered white water and / or clear water for the purpose of the Basisthesquerprofilprofil the fibrous web.
  • the advantage according to the invention of a two-stage process is achieved that in the first stage a correction of the basis weight cross-profile and in the second stage a dilution with the goal of a consistency across the width of the fibrous web can be realized.
  • the device is also characterized by small and inexpensive mixing units.
  • Figures 1 to 3 show three schematic representations of three devices 1 for the respective control of the basis weight cross profile of a fibrous web 2, in particular a paper or board web, in a short cycle at a fibrous web 2 producing and at least one feed system 3 for a high-consistency pulp suspension Q H , a headbox 4 and a wire section 5 having machine, in particular a paper or board - machine.
  • a feed system 3 for supplying the highly consistent pulp suspension Q H is provided in the headbox 4.
  • the respective feed system 3 comprises a line system 6 which has at least one preferably controllable pump 7 (headbox pump) and possibly a separator 8. Furthermore, a respective feed system 9 is provided for feeding of recovered from the wire section 5 white water Q N in the high-consistency pulp suspension Q H for the purpose of dilution.
  • This respective feed system 9 comprises a line system 10, which has at least one preferably controllable pump 11. The resulting from the wire section 5 white water Q N is known to be collected in a white water tank 12 and submitted for further use in the constant part of the machine or in the stock preparation.
  • the high-consistency Pulp suspension Q H here has a consistency in the range of 1 to 6%, preferably from 1.5 to 4.5%, on.
  • a regulation of the respective delivery system 13.1, 13.2, 13.3 can take place, for example, via a known process control system (PLS).
  • a feed system 13.1 having both a pump 14 and a valve 15 is provided, which preferably feeds the white water Q L recovered from the wire section 5 and supplied in a controlled manner for the purpose of the basis weight cross-profiling of the fibrous web 2.
  • a common feed system 13.2 having a pump 14 is provided with a subassembly 16 which divides the white water Q N recovered from the wire section 5 into at least two sub-streams Q N , Q L.
  • the subassembly 14 is a first Zuwoodteilsystem 13.21 for supplying a first portion of the white water Q N to the highly consistent pulp suspension Q H for the purpose of dilution and a second Zuwoodteilsystem 13.22 for preferably controlled feeding a second portion of the white water Q L to the highly consistent pulp suspension Q H for the purpose the basis weight cross-profiling of the fibrous web 2 is provided.
  • a feed system 13.3 having both a pump 14 and a valve 15 is provided, which feeds the clarified water Q L supplied for the purpose of the basis weight transverse profiling of the fibrous web 2 in a controlled manner.
  • the supplied clear water Q L is removed from a separate clear water tank 17.
  • the preferably controlled feeding of at least the white water Q N recovered from the wire section 5 and / or the clear water Q L for the purpose of the basis weight cross-profiling of the fibrous web 2 to form the highly consistent fibrous suspension Q H takes place in the devices 1 shown in FIGS. 1 to 4 in the area of these feed systems 3
  • This type of feed is also in the figure 4 in perspective view in each sectioned feed systems 3, 9, 13, wherein the number of respective sections in this embodiment is the same.
  • the preferably regulated feed also takes place at least partially in the area of the head box 4 which is sectioned over its width B (arrow).
  • each feed system 3, 9, 13 or each feed subsystem is over its width B (arrow), where the number of respective sections S N for the supplied media Q H , Q N , Q L is preferably the same.
  • the medium Q N is supplied for example from a centrifugal distributor, not shown.
  • the feed systems 3, 9, 13 illustrated in FIGS. 1 to 3 each comprise at least one transverse distributor tube 18 of known type. However, they may of course also comprise at least one centrifugal distributor of known type. They may also comprise any units known in the field of constant part or stock preparation, in particular classifiers, deaerators and the like.
  • the feed systems 3, 9, 13.1, 13.2, 13.3 shown in FIGS. 1 to 4 are outstandingly suitable for carrying out the method according to the invention for controlling the basis weight cross-section of a fibrous web 2, in particular a paper or board web, in a short circulation in a fibrous web 2 producing and at least one feed system 3 for a high consistency pulp suspension Q H , a headbox 4 and a wire section 5 having machine, in particular a paper or board machine.
  • the invention provides a method and an apparatus of the aforementioned types which require only small amounts of dilution water to control the basis weight cross-section of a fibrous web by adding dilution water.

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  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP05108909A 2004-10-09 2005-09-27 Procédé et dispositif pour réguler le profil transversal de grammage d'une bande fibreuse Not-in-force EP1645684B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004049261A DE102004049261A1 (de) 2004-10-09 2004-10-09 Verfahren und Vorrichtung zur Regelung des Flächengewichtsquerprofils einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1645684A1 true EP1645684A1 (fr) 2006-04-12
EP1645684B1 EP1645684B1 (fr) 2008-01-02

Family

ID=35427267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05108909A Not-in-force EP1645684B1 (fr) 2004-10-09 2005-09-27 Procédé et dispositif pour réguler le profil transversal de grammage d'une bande fibreuse

Country Status (3)

Country Link
EP (1) EP1645684B1 (fr)
AT (1) ATE382735T1 (fr)
DE (2) DE102004049261A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038091A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil 2
DE102007038089A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil
DE102007038088A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil 3
DE102007038090A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil IV
DE102008056505A1 (de) 2008-11-08 2010-05-12 Voith Patent Gmbh Konstantteil
DE102008058415A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil einer Papiermaschine
DE102008058414A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil mit Entkopplung
DE102008061970A1 (de) 2008-12-12 2010-06-17 Voith Patent Gmbh Konstantteil-Sortierung
DE102009006715A1 (de) 2009-01-29 2010-08-05 Voith Patent Gmbh Ausschussaufbereitung
DE102009054816A1 (de) 2009-12-17 2011-06-22 Voith Patent GmbH, 89522 Konstantteil
DE102010030996A1 (de) 2010-07-06 2012-01-12 Voith Patent Gmbh Metall-Ionen
WO2012013407A1 (fr) 2010-07-30 2012-02-02 Voith Patent Gmbh Dispositif d'amenée du flux de pâte d'une machine de production d'une bande de matière fibreuse
DE102012203379A1 (de) 2012-03-05 2013-09-05 Voith Patent Gmbh Konstantteil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368461B1 (en) * 1997-08-20 2002-04-09 Voith Sulzer Papiermaschinen Gmbh Device to control or regulate the basis weight of a paper or cardboard web

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368461B1 (en) * 1997-08-20 2002-04-09 Voith Sulzer Papiermaschinen Gmbh Device to control or regulate the basis weight of a paper or cardboard web

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038089A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil
DE102007038088A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil 3
DE102007038090A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil IV
WO2009021802A1 (fr) * 2007-08-11 2009-02-19 Voith Patent Gmbh Système d'approche pour une machine à papier
WO2009021803A1 (fr) * 2007-08-11 2009-02-19 Voith Patent Gmbh Partie constante pour une machine à papier
DE102007038091A1 (de) 2007-08-11 2009-02-12 Voith Patent Gmbh Konstantteil 2
DE102008056505A1 (de) 2008-11-08 2010-05-12 Voith Patent Gmbh Konstantteil
DE102008058415A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil einer Papiermaschine
DE102008058414A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil mit Entkopplung
US8313618B2 (en) 2008-12-12 2012-11-20 Voith Patent Gmbh Screening in an approach flow system
DE102008061970A1 (de) 2008-12-12 2010-06-17 Voith Patent Gmbh Konstantteil-Sortierung
DE102009006715A1 (de) 2009-01-29 2010-08-05 Voith Patent Gmbh Ausschussaufbereitung
CN102301067A (zh) * 2009-01-29 2011-12-28 沃依特专利有限责任公司 用于制造纤维幅的方法和装置
WO2011072906A1 (fr) 2009-12-17 2011-06-23 Voith Patent Gmbh Dispositif de régulation de consistance
DE102009054816A1 (de) 2009-12-17 2011-06-22 Voith Patent GmbH, 89522 Konstantteil
DE102010030996A1 (de) 2010-07-06 2012-01-12 Voith Patent Gmbh Metall-Ionen
WO2012004196A1 (fr) 2010-07-06 2012-01-12 Voith Patent Gmbh Ions métalliques
WO2012013407A1 (fr) 2010-07-30 2012-02-02 Voith Patent Gmbh Dispositif d'amenée du flux de pâte d'une machine de production d'une bande de matière fibreuse
DE102010038694A1 (de) 2010-07-30 2012-02-02 Voith Patent Gmbh Konstantteil
CN103154362A (zh) * 2010-07-30 2013-06-12 沃依特专利有限责任公司 用于制备纤维幅的机器的进入系统
CN103154362B (zh) * 2010-07-30 2015-10-21 沃依特专利有限责任公司 用于制备纤维幅的机器的进入系统
DE102012203379A1 (de) 2012-03-05 2013-09-05 Voith Patent Gmbh Konstantteil
WO2013131699A1 (fr) 2012-03-05 2013-09-12 Voith Patent Gmbh Circuit de tête d'une machine de fabrication d'une bande de matière fibreuse

Also Published As

Publication number Publication date
ATE382735T1 (de) 2008-01-15
EP1645684B1 (fr) 2008-01-02
DE502005002386D1 (de) 2008-02-14
DE102004049261A1 (de) 2006-04-13

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