EP3683355A1 - Dispositif et procédé de traitement d'une bande de matière fibreuse - Google Patents

Dispositif et procédé de traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP3683355A1
EP3683355A1 EP19212372.7A EP19212372A EP3683355A1 EP 3683355 A1 EP3683355 A1 EP 3683355A1 EP 19212372 A EP19212372 A EP 19212372A EP 3683355 A1 EP3683355 A1 EP 3683355A1
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EP
European Patent Office
Prior art keywords
fibrous web
web
thickness
conditioning
smoothness
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.)
Pending
Application number
EP19212372.7A
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German (de)
English (en)
Inventor
Friedrich Kendel
Thomas Ischdonat
Mathias Schneider
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
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 EP3683355A1 publication Critical patent/EP3683355A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • 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
    • D21G9/0045—Paper-making control systems controlling the calendering or finishing

Definitions

  • the invention relates to a device for treating a fibrous web according to the preamble of claim 1 and a method according to the preamble of claim 7.
  • calenders are usually used, which can appear in various designs, in particular as roller calenders or as belt calenders.
  • the EP 2 682 520 A1 describes a roll calender in which the paper web is tempered by the passage of the roll nip through a cooling device. Among other things, this enables a large volume of the paper web to be achieved without a corresponding increase in the use of fibers.
  • the object is achieved according to the invention by a device for treating a fibrous web, in particular a paper web, comprising a treatment gap for influencing the thickness and / or smoothness of the fibrous web as well as a conditioning element for conditioning the material web and a sensor device for determining the thickness and / or the smoothness of the fibrous web.
  • the conditioning element is arranged in the web running direction in front of the treatment gap, and the sensor device is arranged after the treatment gap.
  • a control unit is provided, which is set up to control the conditioning element using the values of the sensor device.
  • treatment gap is understood to mean both the classic roller nip and the treatment zones of other types of calenders, such as the belt calender or the shoe calender.
  • conditioning is intended to describe both the moistening of the fibrous web and the tempering, as well as the heating and / or cooling of the web and the combination of moistening and tempering.
  • the conditioning can be optimally adjusted, and the efficiency of the calender can be increased.
  • the effect of the calender on the fibrous web can be determined directly by measuring the smoothness and / or thickness after the calender.
  • the senor device is set up for measuring the thickness and the conditioning element is set up for tempering, in particular for cooling the web.
  • the sensor device can determine values at different positions in the cross-machine direction. This can be realized by two or more sensors distributed over the width of the fibrous web. Alternatively, a thickness sensor and / or smoothing sensor can also be designed to traverse across the web width. With such an embodiment, a cross profile of the corresponding sensor value over the web width can be determined. In the context of the invention, such a cross profile can consist of two or more discrete measured values. To determine the cross profile, these measured values can also be approximated or interpolated, which results in estimated values for the locations between the measurement locations. Knowing the cross-section of the smoothness or the thickness is advantageous because it enables the quality of the paper to be recognized directly across the web width, and can be remedied by countermeasures, especially when conditioning or adjusting the calender.
  • the measured values for thickness and / or smoothness are expediently transmitted to the control unit, which requires these values to control the conditioning element.
  • either the raw data of the measurement can be transmitted, or data processing can already take place in the sensor device.
  • Such a preparation can consist, for example, of a suitable averaging, or of determining a cross profile by approximation or interpolation of the measured values.
  • the sensor device can comprise its own data processing unit.
  • a sensor unit equipped in this way is advantageous, among other things, because the processed measurement data or profiles can also be made available to users other than the control unit quickly and without great effort.
  • the values are then processed only once centrally in the sensor unit, and all users of the data can be sure that they are using the same profile data without the risk of possible incorrect calculations when preparing their own data.
  • the conditioning element is set up to condition the material web differently at different points in the cross-machine direction.
  • the fibrous web in particular in combination with the determination of a cross profile of the thickness and / or smoothness, can be specifically conditioned in the areas where the cross profile deviates from a predetermined target value.
  • the temperature and / or moisture of the paper web can be specifically adjusted so that the web is optimally conditioned over the entire width, but that the web is only conditioned at any point to the extent required to achieve the desired calendering result necessary is.
  • Suitable conditioning elements can be implemented in a variety of ways. For example, steam or water can be applied to the web for moistening from a plurality of nozzles. Air, but also steam or water can be applied to the web for tempering. These fluids can be suitably cooled or heated. In particular, conditioning elements are also possible that enable both moistening, cooling and possibly heating the web in one element. Furthermore, the conditioning unit can act on the fibrous web from one side or from both sides. In particular, one or both of them can apply air or steam to the web. With double-sided loading, more efficient conditioning of the web is possible even at high speeds.
  • a moisture sensor and / or a basis weight sensor are additionally provided after the treatment gap.
  • At least one, in particular all, of the sensors for thickness, smoothness, moisture or weight per unit area is / are arranged at a distance of less than 10 m, in particular between 2 m and 8 m, behind the treatment gap. This means that there are almost no latencies between conditioning and measurement. If the sensors are further away from the treatment gap, the properties of the web may change again and the sensors may then no longer be able to draw conclusions about the calendering result with such precision. Effects that can cause such a change in the web properties are, for example, an equalization of the web moisture through migration of moisture within the paper web or a change in the smoothness due to the resurgence of near-surface fibers.
  • Such a method can in particular be carried out by means of a device according to one aspect of the invention.
  • the thickness and / or the smoothness are determined at different positions in the cross-machine direction and that in particular a transverse profile of the thickness and / or smoothness is determined.
  • the fibrous web can be conditioned differently using the cross machine direction.
  • An advantageous application of a device or a method according to one aspect of the invention is in the production of packaging paper, in particular products such as test liners.
  • a device can be arranged, for example, immediately before the reeling.
  • an aggregate can in particular be provided for the glue application.
  • a drying section is usually provided. Due to irregularities in sizing or differences in the subsequent drying, for example, the paper web can arrive at the calender with a very uneven moisture or temperature profile. These irregularities can then lead to a poor and also uneven calendering result. This can be effectively counteracted by appropriately adjusting the web directly in front of the treatment gap.
  • Figure 1 shows a device according to an aspect of the invention.
  • a device 1 for treating a fibrous web 10, in particular a paper web 10, is shown, as can be used, for example, in a system for producing packaging paper 10.
  • the material web 10 is guided through a treatment gap 2, in which the thickness and / or the smoothness of the paper web 10 can be influenced.
  • the treatment gap 2 is realized as a nip 2 of a roller calender 20.
  • all of the calendering devices known from the prior art can be used for the treatment nips 2 described in this application, in particular hard nip calenders, soft nip calenders, shoe or belt calenders.
  • a sensor device 4 is arranged after the treatment gap 2.
  • the thickness and / or the smoothness of the paper web 10 can be determined.
  • the sensor devices 4 can also provide a profile of the thickness and / or smoothness of the paper web.
  • several sensors 4 can either be arranged distributed over the width of the paper web 10.
  • a sensor can also be designed to be traversing, and thus measure the corresponding values successively at different points across the width of the web.
  • the measured values for thickness and / or smoothness can be transmitted from the sensor device 4 to a control unit 5.
  • the sensor unit 4 can comprise its own data processing unit.
  • a conditioning element 3 is provided in front of the treatment gap 2.
  • This conditioning element 3 is set up to condition the paper web 10, that is to say to temper it and / or moisten it. It is particularly advantageous if the conditioning element 3 can condition differently across the width of the web 10.
  • the control unit 5 is set up to control the conditioning element 3 using the values of the sensor device 4. It is particularly advantageous here if the sensor device 4 provides a profile of the thickness and / or the smoothness and at the same time the conditioning element 3 has the possibility of differently conditioning at different points across the web width. In this case, the paper web 10 can be suitably conditioned in front of the treatment gap 2 via the control unit 5, so that errors in the profile after the treatment gap 2 are prevented.
  • the method according to one aspect of the invention is also advantageous because a very fast reaction to disturbances is possible.
  • the conditioning element 3 is arranged very shortly before the sensor device 4.
  • the temperature control or humidification can also be changed very quickly. If a fault is measured with the sensor device 4, the conditioning element 3 can be used to counteract it immediately. The effect of this countermeasure is immediately recognizable in the measured value. There are therefore almost no latencies. For this reason, among other things, it is also advantageous if the sensor device 4 is arranged at a distance of less than 10 m, in particular between 2 m and 8 m, behind the treatment gap 2.

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EP19212372.7A 2019-01-15 2019-11-29 Dispositif et procédé de traitement d'une bande de matière fibreuse Pending EP3683355A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019100884.0A DE102019100884A1 (de) 2019-01-15 2019-01-15 Vorrichtung und Verfahren zur Behandlung einer Faserstoffbahn

Publications (1)

Publication Number Publication Date
EP3683355A1 true EP3683355A1 (fr) 2020-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19212372.7A Pending EP3683355A1 (fr) 2019-01-15 2019-11-29 Dispositif et procédé de traitement d'une bande de matière fibreuse

Country Status (2)

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EP (1) EP3683355A1 (fr)
DE (1) DE102019100884A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715019A2 (fr) * 1994-12-01 1996-06-05 Voith Sulzer Finishing GmbH Procédé et dispositif pour traiter une bande de matériau
US6260481B1 (en) * 1993-01-16 2001-07-17 V.I.B. Apparatebau Gmbh Apparatus for increasing the gloss and/or smoothness of a web of material
DE10255907A1 (de) * 2002-11-29 2004-06-24 Voith Paper Patent Gmbh Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn
EP1749930A1 (fr) * 2005-08-03 2007-02-07 Voith Patent GmbH Dispositif pour le traitement d'une bande fibreuse
DE102009046053A1 (de) 2009-10-27 2011-05-05 Voith Patent Gmbh Verfahren und Vorrichtung zum Öffnen eines Nips
EP2682520A1 (fr) 2012-07-03 2014-01-08 Metso Paper Inc. Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654799A (en) * 1995-05-05 1997-08-05 Measurex Corporation Method and apparatus for measuring and controlling the surface characteristics of sheet materials such as paper
DE102005031445A1 (de) * 2005-07-04 2007-01-11 Voith Patent Gmbh Verfahren zum Behandeln einer Bahn aus Faserstoff und Kalander

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6260481B1 (en) * 1993-01-16 2001-07-17 V.I.B. Apparatebau Gmbh Apparatus for increasing the gloss and/or smoothness of a web of material
EP0715019A2 (fr) * 1994-12-01 1996-06-05 Voith Sulzer Finishing GmbH Procédé et dispositif pour traiter une bande de matériau
DE10255907A1 (de) * 2002-11-29 2004-06-24 Voith Paper Patent Gmbh Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn
EP1749930A1 (fr) * 2005-08-03 2007-02-07 Voith Patent GmbH Dispositif pour le traitement d'une bande fibreuse
DE102009046053A1 (de) 2009-10-27 2011-05-05 Voith Patent Gmbh Verfahren und Vorrichtung zum Öffnen eines Nips
EP2682520A1 (fr) 2012-07-03 2014-01-08 Metso Paper Inc. Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse

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