EP0445564A1 - Procédé de régulation de la direction d'écoulement d'une caisse de tête dans une machine à papier - Google Patents

Procédé de régulation de la direction d'écoulement d'une caisse de tête dans une machine à papier Download PDF

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Publication number
EP0445564A1
EP0445564A1 EP19910102273 EP91102273A EP0445564A1 EP 0445564 A1 EP0445564 A1 EP 0445564A1 EP 19910102273 EP19910102273 EP 19910102273 EP 91102273 A EP91102273 A EP 91102273A EP 0445564 A1 EP0445564 A1 EP 0445564A1
Authority
EP
European Patent Office
Prior art keywords
headbox
flow
raw material
flow rate
widthwise direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910102273
Other languages
German (de)
English (en)
Inventor
Norio c/o Mihara Machinery Works Fujita
Tetsuo c/o Mihara Machinery Works Makino
Hiroshi Ogawa
Akira Hiroshima Tech Inst. Mitsubishi Eguchi
Mutsuo Nagasaki Technical Institute Kuragasaki
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0445564A1 publication Critical patent/EP0445564A1/fr
Withdrawn legal-status Critical Current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
    • D21F1/02—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
    • 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
    • D21F1/028—Details of the nozzle 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

Definitions

  • the present invention relates to a method for regulating flow directions of raw material jet flows, which is applicable to a headbox in a paper machine.
  • FIG. 9 A headbox in a paper machine in the prior art is illustrated in a perspective view in Fig. 9.
  • reference numeral 1 denotes a headbox main body
  • numeral 2 denotes header pipes
  • numeral 3 denotes a slit-shaped jet port
  • numeral 4 denotes a wire
  • numeral 5 denotes a header pipe block, which is a part integrating a large number of header pipes together.
  • the headbox operates to make raw paper material coming out of the header pipes 2 jet from the slit-shaped jet port 3 uniformly in the widthwise direction of the wire 4.
  • correction for the flow rate of the raw material jetted from the jet port 3 is effected taking into consideration the fact that there exists influence of friction of the flow passageways inside of the headbox 1 and even after it has been jetted onto the wire 4, liquid at the side edge portions of the wire would flow outwards.
  • this method for correcting the flow rate in the prior art, either one of the following two methods was used:
  • a more specific object of the present invention is to provide a method for regulating flow directions, in which not only uneven flow rate is corrected, but also correction of jet flow directions which was difficult in the prior art, can be also realized.
  • a method for regulating flow directions of raw material jet flows of a headbox in a paper machine provided with liquid branching header pipes directed from the upstream of a flow passageway to the downstream as arrayed along the widthwise direction of the paper machine consisting of the steps of providing a header pipe block having such header pipes that a flow rate through a header pipe or pipes at at least one end in the widthwise direction of the paper machine is set or made variable so as to be set larger than a flow rate through a header pipe or pipes at the central portion, and/or a piping or pipings disposed on at least one of the end surfaces in the widthwise direction of a flow passageway within the headbox at the downstream of the header pipes and capable of feeding liquid into the headbox and a piping or pipings disposed at at least one end in the widthwise direction of a flow passageway within the headbox at the downstream of the header pipes and capable of extracting the raw material within the headbox to the outside of the headbox, increasing the flow rates at
  • the reduction of the flow rate at the end portions caused by friction of the flow passageway within the headbox is supplemented, furthermore by partly extracting the raw material from the end portions, the surplus amount of the increased flow rate at the end portions are reduced and also the inwardly directed flow caused by the surplus of the flow rate at the end portions can be corrected.
  • a first preferred embodiment of the present invention will be explained with reference to Fig. 1. It is to be noted that in Fig. 1, since a headbox main body 1, header pipes 2, a jet port 3 and a wire 4 are identical to those used in the headbox in the prior art shown in Fig. 9, detailed description thereof will be omitted, and in the following only characteristic points of the present invention will be described.
  • Fig. 2 is a cross-section front view of a header pipe block 5, in which provision is made such that a flow rate through the end portion may be larger than a flow rate through the central portion, by selecting an inner diameter d 2 of a header pipe 2b in the end portion larger than an inner diameter d 1 of a header pipe 2a in the inside portion. While the header pipes 2b having the inner diameter d 2 are provided only in one column at each end in Fig.
  • header pipes 2b may be provided in two columns at the respective ends, a number of header pipes having a larger inner diameter may be different between the respective ends, the inner diameter of the header pipes may be different between the upper ones and the lower ones, or the size of the inner diameter may be varied into three or more kinds.
  • Fig. 3 shows a B - B cross-section in Fig. 1, in which provision is made such that a part of the raw material at the end portions within the headbox can be extracted to the outside of the headbox through pipings 7 disposed symmetrically at the opposite ends on the upstream side of a slit-shaped jet port 3. Since the inner pressure of the headbox is higher than the atmospheric pressure, provided that the inner diameter of the pipings 7 is chosen sufficiently large, the raw material can be extracted from the headbox merely by opening the pipings 7 to the atmosphere.
  • Fig. 4 shows a flow rate distribution along the widthwise direction and flow directions improved according to the present invention. If the flow rates at the end portions increase as compared to that in the central portion by disposing the header pipe block shown in Fig. 2, then as shown in Fig. 4(b) the flow rates at the end portions would become large as compared to that before correction shown in Fig. 4(a). By the way, since liquid would flow in such direction that its flow rate may become uniform according to a general property of a liquid flow, the flow directions would be directed inwards as shown in Fig. 4(b).
  • Fig. 5 shows one modified embodiment, in which a sleeve 9 is fitted to the inside of the header pipe 2 in such manner that the sleeve may not slip out due to the pressure of the raw material.
  • the flow rates through the end portions can be made larger than the flow rate through the central portion.
  • flow rate balance between the end portions and the central portion as shown in Fig. 4(c) can be changed in a relatively simple manner by replacing the sleeves 9.
  • a tube 10 made of elastic material such as rubber or the like is disposed inside of the header pipe 2, and by applying a pressure to the inside of the tube 10 through a duct 11 the tube 10 is deformed as shown in Fig. 6(b).
  • the flow rate through the header pipe in the end portion can be made larger than the flow rate through the header pipe in the central portion.
  • the flow rate balance between the end portions and the central portion can be changed.
  • a correction effect for the flow directions can be attained as shown in Fig. 4(c).
  • Fig. 8 shows another preferred embodiment which is different from that shown in Fig. 7, in which owing to the fact that pipings 13 are inserted into the headbox as bent along the pond-sides 6, the fear of disturbing flow directions within the headbox is less than the embodiment shown in Fig. 7.
  • the essence of the present invention resides in the header pipe block having header pipes which are preset in such manner that the flow rates through the header pipes in the end portions of the headbox may be larger than the flow rate through the header pipe in the central portion, and/or the pipings disposed at the end portions of the flow passageway and capable of feeding the liquid in the headbox, and the pipings capable of extracting the raw material in the headbox to the outside from the end portions of the flow passageway.
  • the jet flow directions of the headbox can be aligned in the same direction. According to results of experiments, flow directions directed outwards by 0.2° before correction became to direct inwards by 0.1° by supplementing the raw material to increase the flow rates at the opposite end portions, and furthermore, by extracting the raw material to decrease the flow rates at the opposite end portions, the jet directions could be aligned in the same direction.
  • orientation angles of fibers of ⁇ 4° prior to correction were improved up to ⁇ 2° or less. It is to be noted that the orientation angles of fibers as referred to above are experimental values measured by a sonic sheet tester.
EP19910102273 1990-02-26 1991-02-18 Procédé de régulation de la direction d'écoulement d'une caisse de tête dans une machine à papier Withdrawn EP0445564A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP44815/90 1990-02-26
JP2044815A JPH03249297A (ja) 1990-02-26 1990-02-26 抄紙機ヘッドボックスの流向調整方法

Publications (1)

Publication Number Publication Date
EP0445564A1 true EP0445564A1 (fr) 1991-09-11

Family

ID=12701929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910102273 Withdrawn EP0445564A1 (fr) 1990-02-26 1991-02-18 Procédé de régulation de la direction d'écoulement d'une caisse de tête dans une machine à papier

Country Status (4)

Country Link
EP (1) EP0445564A1 (fr)
JP (1) JPH03249297A (fr)
KR (1) KR930007859B1 (fr)
FI (1) FI910856A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595325A1 (fr) * 1992-10-29 1994-05-04 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif pour la régulation du débit dans les parties latérales d'une caisse de tête pour machine à papier
WO1995008024A1 (fr) * 1993-09-17 1995-03-23 Beloit Technologies, Inc. Procede d'orientation des fibres
EP0857816A1 (fr) * 1997-01-14 1998-08-12 Valmet Corporation Caisse de tête d'une machine à papier avec alimentation en eau blanche par les cÔtes latéraux
DE19737646A1 (de) * 1997-08-29 1999-03-04 Voith Sulzer Papiermasch Gmbh Blattbildungssystem mit Formatschilden
US6294051B1 (en) * 1999-04-13 2001-09-25 Kimberly-Clark Worldwide, Inc. Method for improving the edge strength of a fibrous mat
EP2017383A2 (fr) 2007-07-20 2009-01-21 Voith Patent GmbH Dispositif destiné à la fabrication d'une bande de matière fibreuse
DE102007034766A1 (de) 2007-07-25 2009-01-29 Voith Patent Gmbh Vorrichtung und ein Verfahren zur Online-Regelung des Faserorientierungsquerprofils
DE102007036956A1 (de) 2007-08-04 2009-02-05 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
AT505931B1 (de) * 2007-11-19 2009-05-15 Andritz Ag Maschf Blattbildungsverfahren und nasspartie zur herstellung einer faserstoffbahn
EP2063020A1 (fr) * 2006-09-05 2009-05-27 Yokogawa Electric Corporation Procédé de simulation, procédé de commande d'orientation de fibre et dispositif de commande d'orientation de fibre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011001668A (ja) * 2009-06-22 2011-01-06 Voith Patent Gmbh 洗浄機用ヘッドボックス

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1148674A (en) * 1965-08-04 1969-04-16 Beloit Corp Improvements in a headbox of a papermaking machine
WO1986001844A1 (fr) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss Gmbh Systeme de caisse de tete pour machine a papier, et procede pour son utilisation
EP0232604A1 (fr) * 1985-12-13 1987-08-19 Valmet-Ahlstrom Inc. Caisse de tête pour une machine à papier
AT384633B (de) * 1986-05-12 1987-12-10 Albert Hans Stoffauflauf fuer papiermaschinen
WO1988008896A1 (fr) * 1987-05-14 1988-11-17 Beloit Corporation Boite de tete
WO1989011561A1 (fr) * 1988-05-17 1989-11-30 J.M. Voith Ag Caisse de tete pour machines a papier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1148674A (en) * 1965-08-04 1969-04-16 Beloit Corp Improvements in a headbox of a papermaking machine
WO1986001844A1 (fr) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss Gmbh Systeme de caisse de tete pour machine a papier, et procede pour son utilisation
EP0232604A1 (fr) * 1985-12-13 1987-08-19 Valmet-Ahlstrom Inc. Caisse de tête pour une machine à papier
AT384633B (de) * 1986-05-12 1987-12-10 Albert Hans Stoffauflauf fuer papiermaschinen
WO1988008896A1 (fr) * 1987-05-14 1988-11-17 Beloit Corporation Boite de tete
WO1989011561A1 (fr) * 1988-05-17 1989-11-30 J.M. Voith Ag Caisse de tete pour machines a papier

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470439A (en) * 1992-10-29 1995-11-28 Mitsubishi Jukogyo Kabushiki Kaisha End portion flow rate regulating apparatus for a paper machine headbox
EP0595325A1 (fr) * 1992-10-29 1994-05-04 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif pour la régulation du débit dans les parties latérales d'une caisse de tête pour machine à papier
WO1995008024A1 (fr) * 1993-09-17 1995-03-23 Beloit Technologies, Inc. Procede d'orientation des fibres
EP0857816A1 (fr) * 1997-01-14 1998-08-12 Valmet Corporation Caisse de tête d'une machine à papier avec alimentation en eau blanche par les cÔtes latéraux
DE19737646A1 (de) * 1997-08-29 1999-03-04 Voith Sulzer Papiermasch Gmbh Blattbildungssystem mit Formatschilden
US6214169B1 (en) 1997-08-29 2001-04-10 Voith Sulzer Papiermaschinen Gmbh Sheet formation system with deckle plates and method for reducing edge waves
US6294051B1 (en) * 1999-04-13 2001-09-25 Kimberly-Clark Worldwide, Inc. Method for improving the edge strength of a fibrous mat
EP2063020A1 (fr) * 2006-09-05 2009-05-27 Yokogawa Electric Corporation Procédé de simulation, procédé de commande d'orientation de fibre et dispositif de commande d'orientation de fibre
US8214071B2 (en) 2006-09-05 2012-07-03 Yokogawa Electric Corporation Simulation method, fiber orientation control method and fiber orientation control apparatus
EP2063020A4 (fr) * 2006-09-05 2012-04-25 Yokogawa Electric Corp Procédé de simulation, procédé de commande d'orientation de fibre et dispositif de commande d'orientation de fibre
DE102007033938A1 (de) 2007-07-20 2009-01-22 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn
EP2017383A3 (fr) * 2007-07-20 2012-06-13 Voith Patent GmbH Dispositif destiné à la fabrication d'une bande de matière fibreuse
EP2017383A2 (fr) 2007-07-20 2009-01-21 Voith Patent GmbH Dispositif destiné à la fabrication d'une bande de matière fibreuse
EP2022889A2 (fr) 2007-07-25 2009-02-11 Voith Patent GmbH Dispositif et procédé de réglage en ligne du profilé transversal d'orientation des fibres
DE102007034766A1 (de) 2007-07-25 2009-01-29 Voith Patent Gmbh Vorrichtung und ein Verfahren zur Online-Regelung des Faserorientierungsquerprofils
EP2025808A2 (fr) 2007-08-04 2009-02-18 Voith Patent GmbH Machine destinée à la fabrication d'une bande de matière fibreuse
DE102007036956A1 (de) 2007-08-04 2009-02-05 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
AT505931B1 (de) * 2007-11-19 2009-05-15 Andritz Ag Maschf Blattbildungsverfahren und nasspartie zur herstellung einer faserstoffbahn
EP2060675A3 (fr) * 2007-11-19 2009-10-07 Andritz AG Procédé de formation de feuille et partie humide destinés à la fabrication d'une bande de matière fibreuse

Also Published As

Publication number Publication date
FI910856A (fi) 1991-08-27
KR910021512A (ko) 1991-12-20
KR930007859B1 (ko) 1993-08-20
FI910856A0 (fi) 1991-02-22
JPH03249297A (ja) 1991-11-07

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19910315

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Inventor name: MAKINO, TETSUO, C/O MIHARA MACHINERY WORKS

Inventor name: KURAGASAKI, MUTSUO, NAGASAKI TECHNICAL INSTITUTE

Inventor name: OGAWA, HIROSHI

Inventor name: FUJITA, NORIO, C/O MIHARA MACHINERY WORKS

Inventor name: EGUCHI, AKIRA, HIROSHIMA TECH, INST. MITSUBISHI

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