WO2016071262A1 - Revêtement pourvu d'une couche indicatrice - Google Patents

Revêtement pourvu d'une couche indicatrice Download PDF

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Publication number
WO2016071262A1
WO2016071262A1 PCT/EP2015/075410 EP2015075410W WO2016071262A1 WO 2016071262 A1 WO2016071262 A1 WO 2016071262A1 EP 2015075410 W EP2015075410 W EP 2015075410W WO 2016071262 A1 WO2016071262 A1 WO 2016071262A1
Authority
WO
WIPO (PCT)
Prior art keywords
indicator
layer
clothing
fabric
covering
Prior art date
Application number
PCT/EP2015/075410
Other languages
German (de)
English (en)
Inventor
Johan MALMQUIST
Kjell Karlsson
Robert Hilbing
Conny Andersson
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 WO2016071262A1 publication Critical patent/WO2016071262A1/fr

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Classifications

    • 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
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the invention relates to a fabric for use in a machine for producing a fibrous web according to the preamble of claim 1, a method for monitoring the aging of a fabric according to the preamble of claim 13, and a device for monitoring the aging of a fabric according to the preamble of claim 16th
  • the fibrous web In a machine for producing a fibrous web, in particular in a paper machine, the fibrous web is transported over long distances by covering supported by the various process stages.
  • the coverings take on other functions besides the supporting function. In particular, they should support the dewatering of the fibrous web.
  • these fabrics are usually screens or felt structures. These are nowadays mostly made of polymer material. Due to mechanical stress such as abrasion or tensile stress, but also due to chemical stress, an aging process of the clothing occurs during operation. This aging process means that the fabrics no longer adequately fulfill their dewatering tasks after some time, or there is a risk that they will no longer be able to cope reliably with the mechanical loads. Therefore, these fabrics must be replaced at certain intervals.
  • EP 2 105 530 discloses a covering, especially a screen, in which the filaments used are made of several layers of different materials.
  • the filaments consist of a core and several layers, which visually differ from each other. This allows the monitoring of the abrasion of the fabric as the various layers of the filaments are gradually removed and other colors become visible.
  • WO 2005/061787 A1 describes a passive sensor system for detecting wear.
  • a layer of colored staple fibers is applied to the base fabric of a press felt.
  • This colored layer of staple fibers is covered with a fine textile, whereupon a second layer of staple fibers in a different color is applied. After abrasion of the second layer of staple fibers and of the fine textile, the differently colored first layer of staple fibers becomes visible, whereby abrasion monitoring can take place.
  • a disadvantage of the sensor system described here is, inter alia, that the design options described in the design of a press felt are limited by the structure described. Thus, especially the additional layer of a fine textile is disturbing. Not only does this make the felt more expensive, but it can also be up to you Design have a more or less severe negative impact on the drainage properties of the felt. In addition, even with the sensor system described in WO 2005/061787 A1 no statement about the aging of the felt by chemical action is possible.
  • Object of the present invention is to provide a fabric in which an aging of the fabric is recognizable, which allows monitoring of the aging of the fabric, the disadvantages of the prior art are overcome.
  • the object is fully achieved by a covering according to the characterizing part of claim 1, a method for monitoring the aging of a fabric according to the characterizing part of claim 13, and a device for monitoring the aging of a fabric according to the characterizing part of claim 16.
  • the covering according to the invention for use in a machine for producing a fibrous web, in particular a paper, board, tissue or pulp web, has a running side facing away from the fibrous web and a paper side facing the fibrous web.
  • the fabric comprises at least one load-bearing basic structure and one or more functional layers.
  • the covering is characterized in that at least one functional layer is designed as an indicator layer.
  • This indicator layer comprises or consists of an indicator material. The indicator material is selected so that it changes one of its optical properties during use of the fabric.
  • the optical property is preferably the color.
  • the optical property may also be a reflection input or the coloring or brightness impression upon irradiation with UV light or IR light.
  • the covering is designed such that indicator layer during the operating period of the covering or at least during Part of the service life of the fabric from the outside is observable. In this way, the change in the optical characteristic of the indicator layer can be observed as a change in the visual impression of the fabric. Further advantageous embodiments are described in the subclaims.
  • the covering is in a preferred embodiment a felt, in particular a press felt, for example for a paper machine.
  • the indicator layer comprises staple fibers or consists thereof.
  • all staple fibers of this indicator layer may consist of indicator material, or only a part thereof.
  • the staple fibers may advantageously consist of a polyamide, a polyethylene or another suitable polymer.
  • more than 80% by weight, particularly preferably more than 90% by weight, very particularly preferably 100% by weight, of the staple fibers of the indicator layer consist of indicator material.
  • the mixture of staple fibers of indicator material with staple fibers of a polymer without indicator property allows great flexibility in the design of the indicator layer.
  • the fibers of indicator material consist of a uniform material, namely the indicator material.
  • This manufacturing technology is usually much easier to produce than so-called bi-component fibers comprising a core of a different material than the cladding area.
  • the fibers of Indikatornnaterial are distributed evenly in an advantageous embodiment of the invention in the indicator layer.
  • the fibers of indicator material are distributed unevenly in the indicator layer.
  • the indicator layer may be configured such that the concentration of the fibers of indicator material in the thickness direction of the indicator layer increases or decreases from an upper side to a lower side. This concentration change in the thickness direction is often but not exclusively uniform over the thickness direction.
  • a further advantageous distribution of the fibers of indicator material in the indicator layer provides that the concentration of the fibers of indicator material in the thickness direction of the indicator layer is higher on the outside and decreases towards the center of the layer. This can go so far that there are no or only isolated fibers as indicator material in the middle of the indicator layer.
  • an optically temperature-resistant material is selected as the indicator material.
  • a material for example a polymer, which is operated in the temperature range in which a felt is usually operated, for example between 20 ° C and 120 ° C, in particular between 30 ° C and 80 ° C, especially between 40 ° C and 70 ° C, its optical properties by the action of temperature does not, or does not change appreciably.
  • the change in the optical properties is significantly lower by the effect of temperature, as by the effect of aging, in particular the chemical aging of the material.
  • a light-resistant material is selected as the indicator material.
  • optically temperature-resistant and / or light-resistant materials By choosing such optically temperature-resistant and / or light-resistant materials, it can be ensured, for example, that an observed optical effect of the covering is really due to chemical and / or mechanical aging, and not for example due to temperature changes in the manufacturing process.
  • the indicator material comprises or consists of a polymer, in particular a polyurethane or another elastomer.
  • a polymer in particular a polyurethane or another elastomer.
  • This is selected to change color by contact with at least one substance used to make the fibrous web.
  • This may be, for example, an optical brightener, a filler, a glue, or a lignin.
  • the substance may also be water or pulp itself, or a substance used further in the process, and combinations of several substances.
  • a color change can come about in different ways.
  • the polymer can react chemically with the substance.
  • one or the other substance can be incorporated into the polymer structure, or at least one substance can also accumulate in the structure of the indicator layer, thus causing the color effect.
  • the discoloration effect occurs regardless of the form in which the polyurethane is present in the indicator layer.
  • This may be, for example, in the form of a membrane or other planar structure or in the form of fibers, especially polyurethane staple fibers.
  • Other forms of indicator material are also possible.
  • the proportion of the indicator material in the total weight of the clothing is less than 50%, preferably less than 30%, particularly preferably less than 15%. This is usually quite sufficient to observe the desired indicator effect, however, allows in the design of the clothing sufficient freedom to bring other materials used.
  • the clothing comprises several, in particular two, indicator layers.
  • At least one indicator layer is viewed from the load-bearing basic structure in the direction of the paper side.
  • At least one indicator layer viewed from the load-bearing basic structure, is mounted in the direction of the running side.
  • at least one indicator layer is viewed in the thickness direction between the load-receiving Basic structure and at least one other functional position, in particular a layer of staple fibers is aided.
  • Such an embodiment can, inter alia, advantageous because it allows a double aging monitoring of the fabric. If, for example, the indicator layer changes its color as a result of (chemical) aging, on the other hand, this color change becomes increasingly more observable from the outside, the more abrasion (mechanical aging) the further functional layer has undergone.
  • at least one further functional layer in particular a layer of staple fibers, is provided between at least one indicator layer and the load-absorbing basic structure.
  • at least the outermost functional layer of the paper side and / or the outermost functional layer of the running side of an indicator layer viewed in the thickness direction.
  • Such an embodiment may allow an advantageous double aging monitoring of the fabric.
  • the external indicator layer can change color as a result of chemical aging.
  • the indicator layer is gradually removed again by abrasion or fiber loss, so that the color changes again.
  • the color change of the indicator layer is set by selecting the indicator material so that the darkest hue is reached after the end of the running-in phase of the clothing, and then again by abrasion and fiber loss brightening of the fabric.
  • one or more other functional layers, in particular staple fiber layers are combined with the one or more indicator layers.
  • the covering comprises, in addition to the at least one indicator layer, at least one further functional layer viewed from the load-bearing basic structure in the direction of the paper side and at least one further functional layer viewed from the load-absorbing basic structure in the direction of the running side.
  • Another independent aspect of the invention relates to a method for monitoring the aging of a fabric for use in a machine for producing a fibrous web.
  • the covering is designed according to one of claims 1 to 12.
  • the paper side and / or the running side of the clothing is detected at regular or irregular time intervals by technical means or by visual inspection and examined with regard to the at least one optical property of the indicator material.
  • an optical sensor device detects the color impression of the paper side and / or the running side of the clothing and these values are compared in a connected computer system with stored reference values.
  • a signal in particular an electrical, optical or acoustic signal, is transmitted.
  • color impression in the context of this application includes not only the color in the strict sense, but also the impression of other possible optical properties, which cause an indicator effect in the indicator material, such as gloss or reflection.
  • the term also includes light dark contrasts, for example, when the indicator material is designed so that it changes from a light hue to a dark hue, especially from white to black or vice versa, or if it is from a gray to a other gray tone changed.
  • the optical sensor device detects the color impression at a plurality of positions over a transverse direction of the clothing, preferably continuously over the transverse direction of the clothing or over parts thereof. In a connected computer system so that a cross profile of the aging state of the fabric is created.
  • This information about the aging cross profile can be displayed, for example, on a screen.
  • Another independent aspect of the invention relates to a device for monitoring the aging of a fabric.
  • the device comprises a covering, an optical sensor device and a connected computer system and is characterized in that the covering is designed according to one of claims 1 to 1 1, and the optical sensor device is suitable for detecting the color impression of the clothing.
  • the optical sensor device comprises a camera, in particular a surface camera or a line camera.
  • the optical sensor device may also comprise a plurality of cameras. These can be distributed over the width of the fabric, for example.
  • the device comprises means for moving the optical sensor device, in particular for traversing the optical sensor device in the transverse direction of the clothing.
  • the device is suitable for use in the press section of a paper machine, which comprises a felt cleaning unit, in particular a movable high-pressure cleaning unit.
  • the optical sensor device uses the same means used for traversing, as the felt cleaning unit.
  • Figure 1 Figure 1 and Figure 3 each show a section through a fabric according to the invention
  • This press felt 4 comprises a load-bearing basic structure 3 and a staple fiber layer 2 as a further functional layer 2.
  • the staple fibers of this staple fiber layer 2 may consist of a polyamide. Depending on the field of application, it is also possible that the staple fibers consist of polyethylene or another polymer.
  • an indicator layer 1 is attached between the staple fiber layer 2 and the load-bearing basic structure 3 in the example shown in Figure 1, an indicator layer 1 is attached.
  • This indicator layer is designed as a nonwoven fabric layer. It comprises staple fibers of indicator material, for example a suitable polyurethane, as well as staple fibers of a further polymer, for example a polyamide.
  • the proportion of the indicator material in the indicator layer is often less than 80% by weight, preferably between 40% by weight and 60% by weight, particularly preferably between 45% by weight and 55% by weight. However, there may also be applications in which the proportion of indicator material is over 80% by weight, especially over 90% by weight of the indicator level. In extreme cases, the indicator layer can consist of 100% indicator material.
  • the indicator layer 2 is applied in the direction of the paper side 5 in FIG.
  • FIG. 1 An embodiment as shown in FIG. 1 is advantageous, inter alia, because it permits double aging monitoring of the clothing 4. If, for example, the indicator layer 1 changes its color as a result of (chemical) aging, on the other hand this color change from the outside becomes increasingly more observable the more abrasion (mechanical aging) the further functional layer 2 has undergone.
  • the configuration of the fabric 4 according to the invention in FIG. 2 comprises the same elements as the configuration in FIG. 1. In contrast, however, a staple fiber layer 2 is arranged between the indicator layer 1 and the load-bearing basic structure 3.
  • Such an embodiment may allow an advantageous double aging monitoring of the fabric 4.
  • the outer indicator layer 1 can change color due to chemical aging.
  • the indicator layer 1 is gradually removed again by abrasion or fiber loss, so that the color changes again.
  • the color change of the indicator layer 1 is set by selecting the indicator material so that the darkest hue is reached after the end of the running-in phase of the fabric 4, and then again by abrasion and fiber loss lightening of the fabric 4.
  • other embodiments of this aspect of the invention are possible.
  • further layers in particular further staple fiber layers, may also be provided in a press felt according to the invention.
  • at least one additional staple fiber layer can be provided from the basic structure in the direction of the running side.
  • a string 4 according to the invention is sketched, which comprises two indicator layers 1.
  • An indicator layer 1 is provided from the load-bearing base structure 3 in the direction of the paper side 5 and a second indicator layer 1 in the direction of the running side 6.
  • the two indicator layers 1 are each arranged between the load-bearing basic structure 3 and a staple fiber layer 2.
  • other combinations may also be provided according to the invention.
  • the staple fiber layer 2 is omitted on the outermost side 6.

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  • Paper (AREA)

Abstract

L'invention concerne un revêtement destiné à être utilisé dans une machine de fabrication d'une bande de matière fibreuse, notamment une bande de papier, de carton, de tissu ou de cellulose qui comporte un côté défilement (6) opposé à la bande de matière fibreuse et un côté papier (5) tourné vers la bande de manière fibreuse, lequel revêtement comporte au moins une structure de base (3) de réception de charge et une ou plusieurs couches fonctionnelles caractérisées en ce qu'au moins une couche fonctionnelle est réalisée sous la forme d'une couche indicatrice (1) qui comporte un matériau indicateur ou est constitué de celui-ci, le matériau indicateur étant choisi de telle sorte qu'une de ses propriétés optiques, en particulier sa couleur, change lors de l'utilisation du revêtement. L'invention concerne également un procédé de surveillance du vieillissement d'un revêtement et un dispositif de surveillance du vieillissement d'un revêtement, le revêtement étant un revêtement selon l'invention.
PCT/EP2015/075410 2014-11-05 2015-11-02 Revêtement pourvu d'une couche indicatrice WO2016071262A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014222546.9 2014-11-05
DE102014222546 2014-11-05

Publications (1)

Publication Number Publication Date
WO2016071262A1 true WO2016071262A1 (fr) 2016-05-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/075410 WO2016071262A1 (fr) 2014-11-05 2015-11-02 Revêtement pourvu d'une couche indicatrice

Country Status (1)

Country Link
WO (1) WO2016071262A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017122668A1 (de) * 2017-09-29 2018-10-31 Voith Patent Gmbh Bespannung und Verfahren zu deren Herstellung sowie Faservlies
CN109629311A (zh) * 2018-12-19 2019-04-16 上海金熊造纸网毯有限公司 一种双层底网造纸毛毯
WO2022122576A1 (fr) * 2020-12-07 2022-06-16 Voith Patent Gmbh Dispositif et procédé de production d'une bande de matière fibreuse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315499A (en) * 1996-07-23 1998-02-04 Scapa Group Plc Industrial textile including photochromic material
EP1275772A2 (fr) * 2001-07-13 2003-01-15 Voith Paper Patent GmbH Procédé et dispositif pour surveiller l' état de feutres ou tamis
WO2004061168A2 (fr) 2002-12-31 2004-07-22 Albany International Corp. Monofilaments faconnes avec rainures et tissus fabriques avec ces monofilaments
WO2005061787A1 (fr) 2003-12-11 2005-07-07 Albany International Corp. Systeme de detection passif pour la detection de problemes d'usure dans une garniture de machine a papier
EP2105530A1 (fr) 2003-06-27 2009-09-30 Albany International Corp. Indication du degré d'usure d'un tissu à l'aide de filaments

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315499A (en) * 1996-07-23 1998-02-04 Scapa Group Plc Industrial textile including photochromic material
EP1275772A2 (fr) * 2001-07-13 2003-01-15 Voith Paper Patent GmbH Procédé et dispositif pour surveiller l' état de feutres ou tamis
WO2004061168A2 (fr) 2002-12-31 2004-07-22 Albany International Corp. Monofilaments faconnes avec rainures et tissus fabriques avec ces monofilaments
EP2105530A1 (fr) 2003-06-27 2009-09-30 Albany International Corp. Indication du degré d'usure d'un tissu à l'aide de filaments
WO2005061787A1 (fr) 2003-12-11 2005-07-07 Albany International Corp. Systeme de detection passif pour la detection de problemes d'usure dans une garniture de machine a papier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017122668A1 (de) * 2017-09-29 2018-10-31 Voith Patent Gmbh Bespannung und Verfahren zu deren Herstellung sowie Faservlies
WO2019063302A1 (fr) * 2017-09-29 2019-04-04 Voith Patent Gmbh Revêtement et procédé pour le fabriquer ainsi que non-tissé
CN111164260A (zh) * 2017-09-29 2020-05-15 福伊特专利有限公司 网毯及其制造方法以及纤维无纺布
US11208764B2 (en) 2017-09-29 2021-12-28 Voith Patent Gmbh Paper machine clothing, method for producing same, and nonwoven fabric
CN111164260B (zh) * 2017-09-29 2022-02-08 福伊特专利有限公司 网毯及其制造方法以及纤维无纺布
CN109629311A (zh) * 2018-12-19 2019-04-16 上海金熊造纸网毯有限公司 一种双层底网造纸毛毯
WO2022122576A1 (fr) * 2020-12-07 2022-06-16 Voith Patent Gmbh Dispositif et procédé de production d'une bande de matière fibreuse

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