EP2850246A1 - Procédé de détection de l'encrassement d'un habillage de machine à papier et habillage de machine à papier - Google Patents

Procédé de détection de l'encrassement d'un habillage de machine à papier et habillage de machine à papier

Info

Publication number
EP2850246A1
EP2850246A1 EP13722438.2A EP13722438A EP2850246A1 EP 2850246 A1 EP2850246 A1 EP 2850246A1 EP 13722438 A EP13722438 A EP 13722438A EP 2850246 A1 EP2850246 A1 EP 2850246A1
Authority
EP
European Patent Office
Prior art keywords
fabric
contamination
contact surface
cleaning
clothing
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Withdrawn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
EP13722438.2A
Other languages
German (de)
English (en)
Inventor
Marc Erkelenz
Franziska FERRER
Lisa Nagel
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 EP2850246A1 publication Critical patent/EP2850246A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21F1/0027—Screen-cloths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • 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
    • D21F1/32—Washing wire-cloths or felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/001—Drying webs by radiant heating
    • D21F5/002—Drying webs by radiant heating from infrared-emitting elements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/94—Investigating contamination, e.g. dust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/061—Sources

Definitions

  • the present invention relates to a method for detecting contamination of a fabric in a machine for producing and / or treating a material web, in particular fibrous web such as. Paper, board or tissue web according to the preamble of patent claim 1.
  • a plurality of fabrics are used for transporting and dewatering a fibrous web to be produced.
  • the fabrics are, for example, in the form of forming fabrics in the forming section, in the form of press felts in the press section and in the form of dryer fabrics in the dryer section or as transfer belts.
  • the screens and felts are at least partially designed as fabric tapes with open pore structure.
  • the clothing is increasingly contaminated by, for example, in the fiber suspension containing contaminants such as adhesives or other additives.
  • the pores and meshes become attached to the above-mentioned substances over time.
  • the object is achieved by a method having the features of patent claim 1 in that the contact surface and a void volume providing top and / or bottom of a fabric is detected by a detection and evaluation and is determined by the detection and evaluation, whether pollution is present and, in the presence of contamination, categorization according to the type of contamination with at least a first and second category is carried out, the first category comprises contamination of the contact surface and the second category comprises contamination of the void volume without contamination of the contact surface.
  • the contamination of the top and / or bottom of the fabric is divided into at least two categories, namely a first category, which includes contamination of the contact surface and a second category, which includes contamination of the void volume without contamination of the contact surface.
  • a first category which includes contamination of the contact surface
  • a second category which includes contamination of the void volume without contamination of the contact surface.
  • the snow wear on the contact surface of the fabric so this can rest on the material portions of the fabric, which are brought into contact with the fibrous web or with elements of the machine, such as. Scrapers, strips, roll covers and the like during operation of the machine.
  • the contamination may optionally connect several such sections of material.
  • the internal contamination is present in the open cavity volume of the clothing and not on the contact surface of the clothing. It is also conceivable that a contamination is arranged on the contact surface and extends into the cavity volume of the clothing, even in one piece. In this case, this pollution is assigned to the first category.
  • the basic idea of the invention is that a distinction is made between at least two categories of pollution, the contaminations of the two categories extending in the direction of thickness of the clothing extending into the interior of the clothing at different depths, and the first of the categories comprising contamination of the contact surface of the clothing Categories excludes contamination of the contact surface of the fabric.
  • the exact boundary between the two categories of pollution is drawn in each case depends on several factors, such as the inner and / or outer structure of the fabric and their cleanability with the cleaning fluid.
  • the exact limit can be determined, for example, on the basis of tests with the respective clothing.
  • the contamination of the first category comprises contamination of the contact surface and also contamination which, viewed in the thickness direction of the clothing, extends from the contact surface up to 10% relative to the total thickness of the clothing into the interior of the clothing.
  • the pollution of the second category may then be fouling which, viewed in the thickness direction of the fabric, is located further inwardly than that of the first category.
  • the first category is formed only by contamination of the contact surface of the fabric, whereas the pollution of the second category is formed by all arranged outside the contact surface pollution. If, in the context of the present invention, the contact surface is mentioned, the entire contact surface of the clothing or a part of the contact surface of the clothing may be meant here.
  • the volume of the cavity is mentioned, the total void volume of the fabric or a part of the void volume of the fabric may be meant here.
  • the covering is permeable to fluid, such as water and / or air and / or vapor.
  • the covering may, for example, be a drying wire.
  • the categorization of the contamination is based on a visual inspection of the top and / or bottom of the fabric.
  • the upper and / or lower side of the clothing is detected with an optical scanner and, for example, an assessment and categorization of the contamination is carried out on the basis of visual contrasts.
  • the top or bottom of the fabric here represents the paper side or the machine side of the fabric. In many cases, however, only one of the two sides of the top or bottom subjected to the visual inspection.
  • a particularly preferred development of the method according to the invention provides for applying a fluid cleaning medium to the covering to remove the dirt by means of a cleaning device on the top or bottom side, the cleaning device providing different cleaning programs and the different cleaning programs depending on the detection method used. and evaluation unit made categorization of the type of pollution selected.
  • the different cleaning programs differ in at least one of the following parameters: angle of incidence of the cleaning jet on the contact surface of the clothing, pressure of the fluid cleaning medium, geometry of the cleaning jet, cleaning time, cleaning additives, cleaning sequence, duration of the individual cleaning pulses, traversing speed of the cleaning device, drying after the fluid action.
  • a further particularly preferred embodiment of the invention provides that a contrast pattern is evaluated for categorizing the pollution, in which visual contrasts are taken into account between the contact surface of the fabric forming material sections, which are covered with dirt and those the contact surface of the fabric forming material sections, the not covered with pollution.
  • the contamination on the contact surface of the fabric produces an irregular contrast pattern, whereas the contamination within the fabric produce a regular contrast pattern.
  • the regular contrast pattern can be determined by the spacing of the warp and / or weft yarns of the fabric, depending on whether the contrast pattern is viewed in the warp or weft direction. If, during the visual assessment, contamination is arranged in the area both on contact areas and in the void volume of the area under consideration, on the one hand the considered area can be reduced until only one of the two categories of contamination is present. Alternatively, it is also conceivable that the size of the considered area is left and a possibly to be carried out cleaning treatment is performed with the cleaning program, which is assigned, for example, in terms of area most heavily represented pollution category.
  • the contrast patterns viewed in the machine direction or cross machine direction of the clothing can, for example, be as follows:
  • the covering in particular on the side which is visually inspected, is exposed to an illuminating light and uses a response light emanating from the covering in response to the illuminating light for visual inspection becomes.
  • the term "light” is not used exclusively for electromagnetic radiation in the visible spectral range, but - unless this is explicitly stated - also electromagnetic radiation in the infrared spectral range (IR light) and in the ultraviolet spectral range ( UV light).
  • the response light reflected at least partially from the fabric Illumination light is, wherein the intensity of the emanating from dirty areas of the fabric portions of the response light from the intensity of the emanating from clean areas of the clothing portions of the response light.
  • the intensity of the emanating from dirty areas of the fabric portions of the response light from the intensity of the emanating from clean areas of the clothing portions of the response light.
  • it can be, for example, light in the visible spectral range in the illumination light and the response light.
  • the material forming the clothing comprises at least partially luminescent material. If the clothing is formed by a textile structure or a textile fabric with yarns, it is particularly useful if at least some of the yarns of the clothing comprise luminescent material. This makes it possible for the response light emanating from the clothing to be at least partially luminescent light in the visible spectral range in response to the illumination light, the intensity of the portions of the response light emanating from contaminated areas of the clothing being dependent on the intensity of the portions emanating from clean areas of the clothing the answer light is different. By exploiting the luminescence effect, the visual contrast between soiled and clean material sections of the clothing can be further increased.
  • the warp and / or weft yarns comprise the luminescent material. It is conceivable in particular that all warp and / or weft yarns comprise the luminescent material. It is advantageous, in particular, if the warp and weft yarns comprise the luminescent material, since this avoids a light / dark pattern which is produced even with a clean fabric, which is produced by the "luminous" and "non-luminous” yarns and the detection of internal contamination makes it more difficult.
  • the luminescent material may, for example, be fluorescent or phosphorescent material.
  • the illumination light is UV light
  • the luminescent material is UV luminescent and the response light is in particular light in the visible spectral range.
  • the illumination light is IR light
  • the luminescent material is IR-luminescent and the response light is in particular light in the visible spectral range.
  • the illuminating light may also be heat radiation emitted by one or more drying cylinders in a dryer section of a machine for producing and / or treating a material web, in particular a fibrous web such as a paper, board or tissue web becomes.
  • the illumination and response light is light in the visible spectral range and the yarns of the clothing do not comprise a luminescent material.
  • a machine for producing and / or treating a material web in particular a fibrous web, such as a paper, board or tissue web
  • a machine for producing and / or treating a material web in particular a fibrous web, such as a paper, board or tissue web
  • a covering for a machine for producing and / or treating a material web, in particular fibrous web such as paper, board or tissue web is proposed, comprising yarns, at least some of which comprise a luminescent material.
  • the covering may preferably be a drying wire in which, in particular, at least some of the warp and / or weft yarns comprise the luminescent material.
  • FIG. 1 shows an apparatus for carrying out the method according to the invention for
  • FIG. 2 shows the soiled clothing of FIG. 1 in plan view
  • FIG. 3 shows the contrast pattern of the soiled fabric according to FIG. 2 and FIG.
  • Figure 4 shows different detail enlargements of the clothing in the CD direction
  • the fabric 1 shows a device 1 for carrying out the method according to the invention for the categorization and cleaning of a fabric 2, which is only partially shown, in a schematic exemplary representation in plan view of the paper side forming the top side 9 of the fabric 2.
  • the fabric 2 is present as a fabric formed and has in the machine direction MD extending warp threads 10 and extending in the cross machine direction CD weft threads 1 1, of which only a small area can be seen in the present illustration.
  • the device 1 comprises a detection and evaluation unit 3 with an optical scanner 4 and an evaluation and control unit 6 which communicates with it and in turn communicates with a cleaning device 5.
  • the optical scanner 4 and the cleaning device 5 are arranged on a traversing device and can traverse them transverse to the clothing 2 in the cross-machine direction CD.
  • the cleaning device 5 By the cleaning device 5, the top 9 of the fabric 2 to remove contamination with a fluid cleaning medium acted upon, the cleaning device 5 provides various cleaning programs that are selected in response to a made by the detection and evaluation unit 3 categorization of the type of contamination.
  • the optical scanner 4 is directed to the paper side of the fabric 2 providing top 9 of the fabric 2 and recorded here visually temporally successively locally different areas of the top 9 of the fabric 2 and sends image signals to the evaluation and control unit 6.
  • the evaluation and Control unit 6 evaluates the image signals detected by the optical scanner 4 and automatically controls the cleaning device 5 on the basis thereof, ie specifies, among other things, with which cleaning program depending on the contamination category of a region the
  • the various cleaning programs differ in at least one of the following parameters: impact angle of the cleaning jet on the contact surface of the clothing, pressure of the fluid cleaning medium, cleaning time, cleaning additives, cleaning sequence, duration of each cleaning pulses, traversing speed of the cleaning device.
  • the categorization of the pollution takes place on the basis of a visual inspection of the top 9 of the cover 2.
  • the categorization differs according to the invention in all cases between the first category, the pollution includes 7, which is located on top of the contact surface 12 of the fabric 2 and the second category which pollution 8, which is arranged in the cavity volume of the fabric 2 and does not cover the contact surface.
  • FIG. 4a shows pollution 7 of the first category K1, which is arranged on the contact surface 12 of the top 9 and Schnauze 8 of the second category, which extends in the cavity volume 13 sections and this is arranged in the thickness direction D of the fabric further inside the fabric 2 and the contact surface 12 is not covered.
  • the contact surface 12 of the fabric 2 is formed in the present embodiment by the thread sections of the warp threads 10 and weft threads 1 1 of the fabric 2, which are brought into contact with a paper web during the intended use of the fabric 2.
  • the contact surface 12 is formed only by the horizontally extending sections of the weft threads 11.
  • FIG. 4b shows contamination 7 which is arranged on the contact surface 12 of the upper side 9 and extends into the cavity volume 13 of the clothing. Since this contamination covers the contact surface 12, it is counted to the first category K1, although the contamination also extends into the cavity volume 13.
  • pollution 7 which is not arranged on the contact surface 12 of the top 9, but only in the cavity volume 13 of the fabric. This pollution is reckoned to the second category K2.
  • FIG. 4d shows contamination 7, which is arranged only on the contact surface 12 of the upper side 9. Since this contamination covers the contact surface 12, this is calculated to the first category K1.
  • FIGS. 2 and 3 show the fabric 2 with different types of snow wear (FIG. 2) and the resulting contrast pattern (FIG. 3) due to the nature of the fouling along different machine direction MD scans.
  • FIG. 3 a shows the contrast pattern for the scan along A - A in FIG. 2
  • FIG. 3 b shows the contrast pattern for the scan along B - B in FIG. 2 and FIG.
  • 3 c shows the contrast pattern for the scan along C - C in FIG. 2 nor that in order to increase the visual contrast present, the warp and the weft threads 10, 1 1 of the cover 2 comprise a luminescent material.
  • the scan along A - A shows a region of the top 9 of the fabric with pollution 8 within the fabric 2. This means that the thread sections which form the contact surface of the fabric 2 in this area, are not covered with dirt, but wells in the Inside the fabric as well as possibly thread portions of the fabric, which form the interior of the fabric in this area are covered with dirt.
  • the light emanating therefrom is at least partially luminescent light in response to an illumination light emitted, for example, by an illumination source, the intensity of the portions of the response light emanating from soiled areas of the clothing being less than the intensity of clean areas of the covering outgoing portions of the answering light.
  • FIG. 3a shows a regular contrast pattern along the section with contamination within the clothing, corresponding to the spacing of successive weft threads, and a consistently high intensity along the unpolluted portion of the clothing in the scanning direction A-A.
  • the scan along B - B shows a region of the top side 9 of the fabric 7 with dirt 7 on the contact surface of the fabric 2. This means that the thread sections which form the contact surface of the fabric 2 in this area are covered with dirt.
  • the yarns of the clothing comprise luminescent material
  • the light emanating therefrom is at least partially luminescent light in response to an illuminating light emitted by an illumination source, for example, the intensity of the portions of the response light emanating from soiled areas of the clothing being less than the intensity emanating from clean areas of the clothing Proportions of the answer light.
  • FIG. 3b shows an irregular contrast pattern with a high intensity minimum along the portion of contamination on the contact surface of the clothing and a consistently high intensity along the un soiled portion of the clothing in the scanning direction B-B.
  • the scan along C - C shows an unpolluted area of the top 9 of the fabric. This means that neither thread sections of the fabric 2, which provide the contact surface of the fabric, nor the open void volume of the fabric in this area are covered with dirt. Since there is no contamination, the contrast pattern of Figure 3c shows a uniformly high intensity corresponding to the intensity that is generated by uncovered thread sections of the fabric.
  • the illumination light in the present embodiment can be, for example, UV or IR light.
  • the covering may alternatively be a layer or knitted fabric. It is also conceivable that the fabric is formed from one or more perforated films.

Landscapes

  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention concerne un procédé permettant de détecter l'encrassement d'un habillage offrant une surface de contact et un volume creux dans une machine destinée à fabriquer et/ou traiter une bande de matière, en particulier une bande de matière fibreuse, par exemple bande de papier, carton ou tissu sur laquelle l'encrassement est détecté et évalué par une unité de détection et d'évaluation. L'invention se caractérise par le fait que l'unité de détection et d'évaluation entreprend une classification selon le type d'encrassement, tout en distinguant l'encrassement situé sur la surface de contact de l'habillage et l'encrassement situé à l'intérieur de l'habillage.
EP13722438.2A 2012-05-16 2013-05-14 Procédé de détection de l'encrassement d'un habillage de machine à papier et habillage de machine à papier Withdrawn EP2850246A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012208201A DE102012208201A1 (de) 2012-05-16 2012-05-16 Verfahren zur Erfassung von Verschmutzung einer Papiermaschinenbespannung
PCT/EP2013/059904 WO2013171195A1 (fr) 2012-05-16 2013-05-14 Procédé de détection de l'encrassement d'un habillage de machine à papier et habillage de machine à papier

Publications (1)

Publication Number Publication Date
EP2850246A1 true EP2850246A1 (fr) 2015-03-25

Family

ID=48430789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13722438.2A Withdrawn EP2850246A1 (fr) 2012-05-16 2013-05-14 Procédé de détection de l'encrassement d'un habillage de machine à papier et habillage de machine à papier

Country Status (5)

Country Link
US (1) US20150153278A1 (fr)
EP (1) EP2850246A1 (fr)
CN (1) CN104302833A (fr)
DE (1) DE102012208201A1 (fr)
WO (1) WO2013171195A1 (fr)

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CN112262363A (zh) 2018-02-27 2021-01-22 利惠商业有限公司 激光整理设计工具
CN112272596B (zh) 2018-02-27 2023-06-23 利惠商业有限公司 激光整理服装的按需制造
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Also Published As

Publication number Publication date
DE102012208201A1 (de) 2013-11-21
CN104302833A (zh) 2015-01-21
WO2013171195A1 (fr) 2013-11-21
US20150153278A1 (en) 2015-06-04

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