WO2020052833A1 - Section de formage et procédé de fonctionnement - Google Patents

Section de formage et procédé de fonctionnement Download PDF

Info

Publication number
WO2020052833A1
WO2020052833A1 PCT/EP2019/069229 EP2019069229W WO2020052833A1 WO 2020052833 A1 WO2020052833 A1 WO 2020052833A1 EP 2019069229 W EP2019069229 W EP 2019069229W WO 2020052833 A1 WO2020052833 A1 WO 2020052833A1
Authority
WO
WIPO (PCT)
Prior art keywords
forming section
friction
covering
coefficient
bar
Prior art date
Application number
PCT/EP2019/069229
Other languages
German (de)
English (en)
Inventor
Stefanie Hänisch
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
Priority to EP19742187.8A priority Critical patent/EP3850151A1/fr
Publication of WO2020052833A1 publication Critical patent/WO2020052833A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • 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
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls
    • 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
    • D21G9/0027—Paper-making control systems controlling the forming section

Definitions

  • the invention relates to a forming section of a machine for producing a fibrous web, a method for operating a forming section and a computer program product.
  • the forming section is a central component of a paper machine.
  • a fiber suspension is usually placed on one fabric or between two fabrics.
  • suction elements such as Suction boxes or suction rollers are removed from the water suspension.
  • a forming section of a machine for producing a fibrous web comprising at least a first covering and at least one suction box, the suction box comprising a suction zone and a first bar which is in frictional contact with the first covering.
  • the forming section has means for determining a coefficient of friction for the friction of the first covering and the first bar.
  • This friction is not known from the outset, as it is influenced by a large number of factors. These are, for example, the structure of the covering, the wear condition of the covering, the material pairing covering / strip, or the stability and thickness of the lubricating film that forms between the strip and Covering.
  • the tribological conditions are very complex and cannot be predicted sufficiently by theoretical considerations.
  • the invention therefore provides means for determining the friction currently acting in the operation of the forming section in the form of a characteristic value. Knowledge of this coefficient of friction enables the operator to take countermeasures that reduce friction and thus reduce both the required drive power and the wear on the fabric.
  • the forming section has a control unit which is set up to change an actuator, such as in particular the vacuum of the suction zone, as a function of the determined coefficient of friction. Automatic control of the forming section is possible by means of such a control unit.
  • a forming section will have several suction boxes, as well as several strips and suction zones.
  • means can advantageously be provided to determine friction characteristics for the friction of the first covering with a plurality of strips, in particular for all strips.
  • the means for determining a coefficient of friction can advantageously include temperature sensors for determining the temperature of the first bar. These temperature sensors can, for example, be integrated directly in the bar. Due to the friction of the covering on the bar, this bar heats up. The measurement of the temperature of the bar can therefore be used very well for a coefficient of friction.
  • the means can include temperature sensors for determining the temperature of a process water.
  • the water drawn off through the suction boxes, also known as white water is usually returned to the process via channels and pipes. Temperature measurement in such a channel or pipeline is very simple. Experiments by the applicant have shown that the temperature of these discharged white water is measurably increased by increased friction and the resulting increased strip temperature.
  • the white water temperature can be between a few tenths of a degree up to 2-4 ° above the temperature of the stock suspension. This measurement can therefore also be used to determine a coefficient of friction.
  • the means can comprise force sensors in order to determine the tensile force exerted by the first covering on the first bar. Due to an increased friction between the covering and the last, an increased force is also exerted on the last.
  • the measurement can be carried out, for example, by measuring the torque or the displacement of the bar, in particular by means of strain gauges.
  • the forming section can be a gap former or a so-called hybrid former.
  • the first covering and any further covering can be a fabric or a perforated film, or the covering can include these elements.
  • the vacuum in step iii) does not necessarily have to take place in a suction zone which is directly adjacent to the first bar.
  • a high coefficient of friction is determined in the rear part of the forming section to reduce a vacuum in the front part of the forming section. As a result, more water gets into the rear part of the forming section, which leads to improved lubrication of the bar and thus to a reduction in friction.
  • the vacuum in the rear part of the forming section can be increased in order to still ensure a sufficient total drainage of the wire section.
  • provision can be made for a temperature measurement, in particular on the first bar or in a process water, to determine the coefficient of friction.
  • it can be provided that the force that exerts the first covering on the first strip is measured to determine the coefficient of friction.
  • measurements can also be carried out on several strips or on several process water flows.
  • the regulation or control of a forming section is usually carried out with the aid of a processing device.
  • the computer of this processing device often also has access to further operating parameters of the paper machine or also quality parameters of the paper produced. These parameters can also be included in the calculation of the coefficient of friction.
  • the invention also relates to a computer program product with program code means for carrying out a method according to one aspect of the invention, the computer program product being executed on a processing device or being stored on a computer-readable data carrier.
  • FIG. 1 shows schematically a section of a forming section according to one aspect of the invention
  • the forming section of a machine for producing a fibrous web shown in FIG. 1 represents a gap former.
  • This comprises a first covering 10 and a second covering 20, which are usually fabrics 10, 20.
  • An aqueous fiber suspension is introduced from the headbox nozzle 30 between the coverings 10, 20.
  • the suspension in the sandwich between the two fabrics 10, 20 is transported between the forming roller 32 and the screen suction roller 31. Thereafter, the fibrous web which has already been formed then continues to run with the first covering 10 and is then usually transferred to a press area which is not shown in FIG. 1.
  • the forming section comprises 3 suction boxes 1 a, 1 b, 1 c. This is an exemplary implementation. Forming sections according to the invention can also comprise more or fewer suction boxes.
  • Each of the suction boxes has a number of strips 2a, 2b, 2c which are in frictional contact with a covering - strips 2a and 2c are in contact with the first covering 10, while the strips 2b are in frictional contact with the second covering.
  • the suction boxes 1 a, 1 b, 1 c also have a number of suction zones, at which a vacuum is present, and with the help of which water is sucked out of the fibrous web. This process water is drained off via lines 3 and is usually returned to the process.
  • the forming section in FIG. 1 can now have one or more means for determining a coefficient of friction.
  • a temperature sensor 4 which can be provided in or on one or more of the strips 2c, is shown as an example in the so-called “Hi-Vac suction box” 1c.
  • a plurality of sensors 4 will be provided in a bar in order to have redundancy in the event that one sensor fails or in order to be able to check the measured values for plausibility.
  • the first suction box 1 a shows the possibility of providing a temperature sensor 5 in or on the discharge line 3 of the white water, and to use these knife values to determine a coefficient of friction.
  • the third suction box 1b shows that different sensors 4, 5 can also be combined to determine the coefficient of friction.
  • temperature sensors 4, 5 are provided both in a strip 2 b and in the discharge line 3. It should be noted that the invention is not specific to this Sensor configuration limited, but only the multitude of possible arrangements should be shown here.
  • thermo sensors 4 instead of the temperature sensors 4 in the bar or in addition to this, further sensors can be provided in or on the bar. These can be force sensors, among other things, in order to determine the tensile force exerted on the bar by the covering.
  • an operating method for such a forming section could, for example, be such that the temperature of a strip 2c in the rear HiVac suction box 1c is monitored by means of a built-in temperature sensor 4.
  • a built-in temperature sensor 4 an average of several temperature sensors can also be formed. This temperature value can be used as a coefficient of friction. If this temperature rises above a predetermined setpoint, one or more vacuums are reduced by means of a control unit (not shown here). These can be vacuums in the same suction box 1 c as well as in other suction boxes 1 a, 1 b, which are generally upstream.
  • control unit also uses further values.
  • the specified target value for the coefficient of friction or the strength of the reduction in vacuum depends on process parameters such as the production speed or the type of paper produced.

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  • Paper (AREA)

Abstract

L'invention concerne une section de formage d'une machine destinée à la fabrication d'une bande de matière fibreuse, comprenant au moins un premier entoilage ainsi qu'au moins une caisse aspirante, la caisse aspirante comprenant une zone d'aspiration ainsi qu'une première baguette qui est en contact de frottement avec le premier entoilage, caractérisée en ce que la section de formage possède des moyens destinés à déterminer une valeur caractéristique de frottement pour le frottement du premier entoilage et de la première baguette. L'invention concerne également un procédé de fonctionnement et un produit de programme d'ordinateur.
PCT/EP2019/069229 2018-09-14 2019-07-17 Section de formage et procédé de fonctionnement WO2020052833A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19742187.8A EP3850151A1 (fr) 2018-09-14 2019-07-17 Section de formage et procédé de fonctionnement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122498.2 2018-09-14
DE102018122498.2A DE102018122498A1 (de) 2018-09-14 2018-09-14 Formierpartie und Betriebsverfahren

Publications (1)

Publication Number Publication Date
WO2020052833A1 true WO2020052833A1 (fr) 2020-03-19

Family

ID=67383771

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/069229 WO2020052833A1 (fr) 2018-09-14 2019-07-17 Section de formage et procédé de fonctionnement

Country Status (3)

Country Link
EP (1) EP3850151A1 (fr)
DE (1) DE102018122498A1 (fr)
WO (1) WO2020052833A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1382741A2 (fr) * 2002-07-18 2004-01-21 Klaus Bartelmuss Appareil pour la fabrication d' une bande de papier comportant au moins une bande de tamisage sans fin guidée par des rouleaux de support et de guidage
DE60215694T2 (de) 2001-11-09 2007-09-06 Metso Automation Oy Verfahren und vorrichtung zur regelung der siebpartie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128866A1 (de) * 1981-07-22 1983-02-10 Feldmühle AG, 4000 Düsseldorf Papiermaschine
DE10163575A1 (de) * 2001-12-21 2003-07-03 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60215694T2 (de) 2001-11-09 2007-09-06 Metso Automation Oy Verfahren und vorrichtung zur regelung der siebpartie
EP1382741A2 (fr) * 2002-07-18 2004-01-21 Klaus Bartelmuss Appareil pour la fabrication d' une bande de papier comportant au moins une bande de tamisage sans fin guidée par des rouleaux de support et de guidage

Also Published As

Publication number Publication date
DE102018122498A1 (de) 2020-03-19
EP3850151A1 (fr) 2021-07-21

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