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WO2006067039A1 - Procede et machine de production d'une bande de matiere fibreuse - Google Patents

Procede et machine de production d'une bande de matiere fibreuse Download PDF

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Publication number
WO2006067039A1
WO2006067039A1 PCT/EP2005/056551 EP2005056551W WO2006067039A1 WO 2006067039 A1 WO2006067039 A1 WO 2006067039A1 EP 2005056551 W EP2005056551 W EP 2005056551W WO 2006067039 A1 WO2006067039 A1 WO 2006067039A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
machine
fibrous web
tension
fibrous
Prior art date
Application number
PCT/EP2005/056551
Other languages
German (de)
English (en)
Inventor
Kerstin Bechtel
Michael Schwarz
Niels Hardt
Original Assignee
Voith 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 filed Critical Voith Patent Gmbh
Publication of WO2006067039A1 publication Critical patent/WO2006067039A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0036—Paper-making control systems controlling the press or drying section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/02—Mechanical driving arrangements

Definitions

  • the invention relates to a method for producing a paper, board, tissue or another fibrous web from a pulp suspension, taking into account the web tension in a machine.
  • DE 199 56 752 A1 discloses a method for controlling or regulating drives in a machine for producing and / or finishing a fibrous web, in particular a paper, board or tissue web, with a press section, in which the fibrous web for dewatering running together with at least one band through at least one, formed by two press rolls press nip, and with a subsequent drying section, in which the fibrous web is passed with at least one band on heated drying cylinder.
  • the fibrous web is transferred to at least one transfer point between two accompanying transfer elements.
  • the receiving transfer element in this case has a higher speed than the transferring transfer element.
  • the known method is characterized in that the speed difference of the transfer elements at the transfer point is set at least substantially as a function of the moisture content of the fibrous web.
  • a paper web must be kept under tension from sheet formation to reeling to a web roll. This is done by incremental increase in train, d. H. Elongation, in web direction. If the web tension is too low, the web run will be affected by the formation of wrinkles or web flutter. If the web tension is too high, the strength of the paper web is exceeded; the consequence is a reduction in the quality of the paper web, for example increased porosity, or even web breaks. According to the current state of the art, the train must be adjusted manually. However, a measurement of the applied force or the associated web tension is not possible. However, the modulus of elasticity, ie the relationship between the web tension and the web tension, depends on both the properties of the material and the settings of the machine.
  • this object is achieved in a method of the type mentioned above in that the web train during production of the fibrous web obtained from data related to the production, ie calculated and adjusted.
  • the invention optimizes the web-pulls in a paper machine, so that the web-pulls are only just as high as minimally required, even with different production types and conditions.
  • the minimum required web tension can be determined.
  • the invention is based on the finding that the required web tension is not only dependent on the dry content of the fibrous web, but also on its basis weight. This is surprising, since the strength is approximately proportional to the weight per unit area with the same composition of matter and the same sheet structure and thus centrifugal forces would have to be compensated. Although the strength of the fibrous web increases in proportion to the increase in basis weight, the centrifugal force is dependent on the percentage of water.
  • the invention achieves better runnability of the paper web (runnability), better utilization of the substance potential and higher quality consistency.
  • the invention enables the calculation of the minimum required as well as the maximum allowable tension as a function of the material properties, the paper properties and machine settings at critical points in the paper machine.
  • the maximum permissible web tension is determined as a function of properties of the pulp suspension or the fibrous web produced from the pulp suspension.
  • an embodiment of the method is advantageous in which the maximum permissible web tension is determined particularly at the points at which there is the risk of a web break of the fibrous web.
  • the method is also characterized in that a range of parameters of the pulp suspension, the fibrous web and / or the machine is determined within which the machine can be operated trouble-free.
  • the web tension is determined as a function of the basis weight and the dry content of the fibrous web as well as the speed of the machine.
  • the elongation of the fibrous web during production can be taken into account for determining the web tension or the web tension or the web forces in the fibrous web.
  • the relationship between the web tension and the elongation of the fibrous web is determined either in the laboratory or by determining the transverse contraction of the fibrous web.
  • Such a method is advantageously further developed by taking into account factors in the production of the fibrous web in determining the relationship between the web tension and the elongation of the fibrous web, in particular the fiber orientation in the machine direction and fiber orientation the transverse direction and / or the filler content of the fibrous web.
  • the minimum required as well as the maximum permissible web tension are determined by a mathematical comparison between the required web tension of the fibrous web and the elongation associated with the respective web tension (substance and type-dependent).
  • the web tension is determined by means of a calculation program in which values of the machine and / or the fibrous web obtained during the production process and / or values known from laboratory measurements from previous production processes of fibrous webs, in particular on the same machine, in particular stored in a variety memory values are taken into account.
  • the invention also relates to a machine for producing a fibrous web according to one of the methods specified above.
  • the machine comprises measuring devices and / or sensors and a computing device for determining operating parameters of the machine during operation and / or properties of the fibrous web.
  • the machine has at least one control device for controlling the web tension as a function of operating parameters determined in the computing device and / or the properties of the machine or the fibrous web.
  • Fig. 1 the beginning of a single-row dryer section
  • Fiber web 1 is used.
  • a fibrous web 1 can be accelerated to a higher speed V 2 by the fibrous web 1 to a
  • Dry felt 4 or another conveyor belt is passed, which is the higher
  • FG means the basis weight of the fibrous web measured by a scanner at the end of the paper machine from the reel.
  • the factor v is the paper machine speed.
  • the factor TG is the dry content of the fibrous web 1, which can be measured, for example, as a function of the vapor pressure in the dryer group.
  • the factor f (l / q) is a function of the breaking length ratio of the breaking length of the fibrous web 1 in the longitudinal direction in relation to the breaking length in the transverse direction.
  • a, b, c coefficients which are valid for a particular paper machine concept, for example, for a paper machine with a tandem Nipcoflex press section, for each type of paper, such as LWC paper (Light Weight Coated Paper), and for a Fabric model, for example, 50% TMP (T hermomechanical pulp) and 25% LF (long fiber pulp) are valid for a particular Stoffentrtrag or a given type of paper.
  • LWC paper Light Weight Coated Paper
  • TMP T hermomechanical pulp
  • LF long fiber pulp
  • the required train is also different depending on the TG of the fibrous web 1, which is taken into account by the factor g.
  • the minimum required web tension for given paper machine parameters is compared with the maximum possible web tension.
  • the flow Web properties Because a papermaker can no longer individually know the web-critical locations in a paper machine, it is necessary to automate the papermaking process.
  • a dependence on the material properties of the roll surface can be taken into account.
  • the same applies to the material influences such as the freeness or for online measurements in the pulp suspension, by means of which also the freeness can be determined.
  • These values can also be used for the automatic correction of the coefficients a, b, c or other coefficients which are not explicitly stated (multidimensional multivariate modeling). Since the coefficients are material-dependent, a minimum web tension with coefficients ai, bi, Ci and a maximum web tension with coefficients a2, b2, C2 can be calculated for each type of pulp suspension.
  • the formula is evaluated for a specific paper machine configuration, for the respective paper type and for a specific paper machine speed and the maximum permissible web tension, ie the elongation of the paper web Fibrous web faced, ie compared with this.
  • the maximum elongation of the fibrous web can be determined by a tensile test in the laboratory. Likewise, safety factors can be taken into account, whereby, for example, only 80% of the maximum elongation or the maximum tensile stress is used for comparison. If the comparison now shows that the required web tension is higher than the permitted comparison value, then countermeasures must be taken, otherwise web run disturbances and breaks may occur.
  • a countermeasure may be, for example, to adjust the speed difference at this point in the paper machine.
  • the dry content at the critical point can be increased (by additional drying of the fibrous web 1) so as to reduce the required web tension.
  • the actual web tension is determined from the velocities of the fibrous web 1 before and after the critical point.
  • the critical point may, for example, be a free draw and / or the release point of the fibrous web 1 on a smooth surface, for example a press roll or a drying cylinder 3, 6.
  • a paper web 1 coming from a press section is transported by a transfer belt 2 onto a first drying cylinder 3 and delivered to it.
  • the paper web 1 has a speed vi.
  • the paper web 1 is transferred on the circumference of the drying cylinder 3 to a moving at a speed V 2 dry felt 4 and transferred via ayersiebsaugwalze 5 to a further drying cylinder 6.
  • sensors 7, 8 are preferably arranged in this area, which measure the different web speeds vi, V 2 .
  • the speeds can be directly via the surface tension, for example by means of the two sensors 7, 8 or via speed sensors, before and after the critical point K be determined.
  • the determined by the sensors 7, 8 speed values vi, V 2 are supplied to a control device 9 which an actuator 10 is actuated in consideration of the values vi, V 2 for adjusting the speed or for example, to adjust the steam pressure.
  • an actuator 10 is actuated in consideration of the values vi, V 2 for adjusting the speed or for example, to adjust the steam pressure.
  • other factors, coefficients, strength values or parameters of the paper machine or fibrous web 1 also flow into the regulating process in the regulating device 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de production d'une bande (1) de papier, carton, tissu mousseline ou d'une autre matière réalisée à partir d'une suspension de matière fibreuse en tenant compte du tirage de bande dans une machine. L'invention est caractérisée en ce que le tirage de bande est obtenu pendant la production de la bande de matière fibreuse (1) à partir des données générées en liaison avec la production.
PCT/EP2005/056551 2004-12-22 2005-12-07 Procede et machine de production d'une bande de matiere fibreuse WO2006067039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004061763.5 2004-12-22
DE200410061763 DE102004061763A1 (de) 2004-12-22 2004-12-22 Presswalze in einer Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn

Publications (1)

Publication Number Publication Date
WO2006067039A1 true WO2006067039A1 (fr) 2006-06-29

Family

ID=35709122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/056551 WO2006067039A1 (fr) 2004-12-22 2005-12-07 Procede et machine de production d'une bande de matiere fibreuse

Country Status (2)

Country Link
DE (1) DE102004061763A1 (fr)
WO (1) WO2006067039A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010090742A3 (fr) * 2009-02-06 2010-10-07 Cognex Corporation Système et procédé pour l'utilisation d'un capteur linéaire
US20200140217A1 (en) * 2018-11-05 2020-05-07 Seiko Epson Corporation Sheet manufacturing apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501642A (en) * 1982-09-23 1985-02-26 Champion International Corporation Method of paper tension control to maintain flutter within a predetermined range
DE19956752A1 (de) * 1999-11-26 2000-09-21 Voith Sulzer Papiertech Patent Antriebsregelung
US6352615B1 (en) * 1997-05-30 2002-03-05 Valmet Corporation Method and equipment in a paper/board machine for regulation of the difference of draw
WO2003054497A2 (fr) * 2001-12-20 2003-07-03 Kimberly-Clark Worldwide, Inc. Appareil et procede permettant de mesurer la tension dans un voile de fibres mobile, de sorte a controler les proprietes dudit voile
US20030155395A1 (en) * 2002-01-08 2003-08-21 Metso Automation Oy Method and equipment in connection with a paper machine or a paper web finishing apparatus
DE10350970A1 (de) * 2003-10-30 2005-05-25 Voith Paper Patent Gmbh Papiermaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501642A (en) * 1982-09-23 1985-02-26 Champion International Corporation Method of paper tension control to maintain flutter within a predetermined range
US6352615B1 (en) * 1997-05-30 2002-03-05 Valmet Corporation Method and equipment in a paper/board machine for regulation of the difference of draw
DE19956752A1 (de) * 1999-11-26 2000-09-21 Voith Sulzer Papiertech Patent Antriebsregelung
WO2003054497A2 (fr) * 2001-12-20 2003-07-03 Kimberly-Clark Worldwide, Inc. Appareil et procede permettant de mesurer la tension dans un voile de fibres mobile, de sorte a controler les proprietes dudit voile
US20030155395A1 (en) * 2002-01-08 2003-08-21 Metso Automation Oy Method and equipment in connection with a paper machine or a paper web finishing apparatus
DE10350970A1 (de) * 2003-10-30 2005-05-25 Voith Paper Patent Gmbh Papiermaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010090742A3 (fr) * 2009-02-06 2010-10-07 Cognex Corporation Système et procédé pour l'utilisation d'un capteur linéaire
US20200140217A1 (en) * 2018-11-05 2020-05-07 Seiko Epson Corporation Sheet manufacturing apparatus

Also Published As

Publication number Publication date
DE102004061763A1 (de) 2006-07-06

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