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EP1760191B1 - Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier - Google Patents

Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier Download PDF

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Publication number
EP1760191B1
EP1760191B1 EP05108022A EP05108022A EP1760191B1 EP 1760191 B1 EP1760191 B1 EP 1760191B1 EP 05108022 A EP05108022 A EP 05108022A EP 05108022 A EP05108022 A EP 05108022A EP 1760191 B1 EP1760191 B1 EP 1760191B1
Authority
EP
European Patent Office
Prior art keywords
spray rod
cleaning
foam
cross
range
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.)
Expired - Lifetime
Application number
EP05108022A
Other languages
German (de)
English (en)
Other versions
EP1760191A1 (fr
Inventor
Ivo Nägeli
Hanspeter Böhler
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.)
Dr W Kolb AG
Original Assignee
Dr W Kolb AG
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 Dr W Kolb AG filed Critical Dr W Kolb AG
Priority to PL05108022T priority Critical patent/PL1760191T3/pl
Priority to DE502005005269T priority patent/DE502005005269D1/de
Priority to AT05108022T priority patent/ATE407257T1/de
Priority to EP05108022A priority patent/EP1760191B1/fr
Publication of EP1760191A1 publication Critical patent/EP1760191A1/fr
Application granted granted Critical
Publication of EP1760191B1 publication Critical patent/EP1760191B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F1/32—Washing wire-cloths or felts
    • 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
    • D21F1/34—Construction or arrangement of spraying pipes
    • D21F1/345—Spraying-pipe cleaners

Definitions

  • the present invention relates to a device for cleaning circulating conveyor belts of a paper machine, in particular for cleaning in interrupted production. Furthermore, it relates to a method for cleaning circulating conveyor belts and a method for retrofitting an existing cleaning system for circulating conveyor belts.
  • a plurality of conveyor belts is arranged. These can take over pure transport function, but they can also, as for example in a Fourdrinier, for the actual sheet formation or for specific drying operations or press resp. Be responsible for drainage processes. Since these conveyor belts are either exposed directly to the pulp or at least fresh and thus deposits causing paper, it can not be avoided that fibers, binders, pigments, etc., but possibly also components of coatings, etc. during operation on and in such conveyor belts deposit and their function, such as their water permeability and homogeneous surface, adversely affect.
  • the cleaning can be done either during production, and here both continuously and in sections. Likewise, the cleaning can be carried out at a stationary paper machine, and thereby either at standstill of the conveyor belt or moving conveyor belt, the latter typically in crawl (so-called crawl speed cleaning, that is compared to the production greatly reduced speed) done.
  • the invention is therefore an object of the above problems of the prior art overcome. It is therefore intended to propose an alternative device for cleaning circulating conveyor belts of a paper machine, in particular for use with a stationary paper machine and for cleaning conveyor belts in crawlspace.
  • the solution to this problem is achieved by providing means for providing foam.
  • the foam provided thereby is transported to at least one spray bar, for example via lines, and is applied by means of at least one spray bar to the conveyor belt through a plurality of openings.
  • the spray bar is preferably above, e.g. arranged transversely to the direction of the tape, so that the foam from the openings can fall freely on the conveyor belt.
  • the essence of the invention thus consists in the fact that it is surprisingly possible to transport foam provided in a separate unit to a spray bar and to apply it through corresponding openings in this spray bar, without the foam decomposing during this transport and thereby substantial proportions of non-foamed Cleaning agents are applied. It can thus be produced as efficiently as possible in the separate unit of the foam, and applied uniformly over the width of the conveyor belt.
  • the conveyor belt is a fabric or a felt based on plastics such as PU, PA, Polyester, possibly also on a metallic basis.
  • the openings are holes or simple holes in the spray bar.
  • the foam can be applied simply and efficiently over the entire transport path, ie from the means for providing foam to the conveyor belt, by dimensioning the structure such that the sum of the cross-sectional areas of all the holes of a spray bar is smaller ( or at most equal to) the cross-sectional area of the spray bar (ie, the line cross-section of the spray bar). If the flow cross-sections are adjusted in this way, pressure changes do not occur at any point, which cause the foam to disintegrate and the cleaning agent to be returned to the undesired liquid state.
  • the bores advantageously each have a cross-sectional area in the range of 7-100 mm 2 , preferably in the range of 10-150 mm 2 , typically 20-30 mm 2 .
  • the holes or better openings may in principle have different cross-sectional areas, such as triangular, square, rectangular, hexagonal, elliptical, etc., but the structure is particularly simple if the holes each have a circular opening. It turns out that then preferably the inner diameter in the range of 3-10 mm, preferably in the range of 4-7 mm is selected.
  • the spray bar On the other side of the spray bar can be designed such that it has a cross-sectional area in the range of 500- 4000 mm 2, preferably in the range of 1000-3500 mm 2.
  • the spray bar may have different cross-sections, in turn, for example, triangular, square, rectangular, hexagonal, elliptical, etc., is particularly easy to use a cylindrical tube.
  • a tubular spray bar When using a tubular spray bar, it may have a substantially circular internal cross-sectional area with a diameter in the range of 25-110 mm, preferably in the range of 40-80 mm.
  • the bores are preferably arranged on the spray bar so that the foam emerging from the bores falls by gravity onto the conveyor belt.
  • the holes can distribute the foam on the conveyor belt evenly and in a manner sufficient for cleaning if, as is preferred, they each have a spacing of 50-200 mm, particularly preferably a spacing of 50-150 mm. It is also possible to provide means by which the spray bar is moved in crawl running conveyor belt in the plane parallel to the surface of the conveyor belt perpendicular to the conveying direction of the conveyor belt back and forth to effect an optimal application with foam.
  • the at least one spray bar is arranged essentially perpendicular to the running direction of the conveyor belt and parallel to its surface, preferably at a distance of 50-500 mm, in particular 150-250 mm, from the surface of the conveyor belt.
  • the means for the continuous provision of foam are composed of means for supplying an aqueous solution of cleaning agent and at least one element for producing foam by targeted supply or admixture of gas, for example air.
  • the element may be a specific mixing chamber for producing foam.
  • the element can also be designed simply as a T-piece, in which, for example, the compressed air is supplied via a leg to the linearly flowing cleaning agent.
  • air is supplied in the form of compressed air, this under a pressure in the range of 2-6 bar via a conduit with a diameter in the range of 10-30mm.
  • a further preferred embodiment of the device according to the invention is characterized in that cleaning agent is supplied from a detergent container to a cleaning central unit in which it is mixed in the desired ratio with supplied water, and subsequently this mixture, optionally via a valve and / or a check valve, the element is supplied.
  • the cleaning agent is preferably formulations containing surfactants, solvents, acids, alkalis and / or enzymes, or mixtures of two or more of these components.
  • the cleaners are presented as an aqueous solution with a content of 0.1-100% and then For example, in a ratio of 2: 1 (detergent solution to water) mixed with water.
  • the use of Alphasolv ® AP is possible, for example, as available from Kolb AG, Switzerland.
  • a further preferred embodiment is characterized in that in addition means for rinsing are arranged, in particular with water, which may also be the spray bar, which is controlled differently for this purpose, that is, which is temporarily exposed to rinse water. It is also possible to provide means for extracting detergent and / or water.
  • the present invention relates to a method for cleaning a circulating conveyor belt of a paper machine.
  • the method is particularly characterized in that foam is provided and this is supplied to at least one spray bar.
  • the foam is then applied to the conveyor belt by means of the spray bar through a plurality of openings, in particular, the sum of the cross-sectional areas of all holes of a spray bar is chosen smaller (or equal) of the cross-sectional area of the spray bar.
  • a device as described above is used.
  • a preferred embodiment of the method is characterized in that the cleaning takes place during the standstill of the paper machine, wherein the conveyor belt is acted upon either at a standstill or continuously in crawlspace with foam. It is particularly preferably applied in the range of 0.1-6 1 / m 2 cleaning mixture and more preferably the conveyor belt is moved at a speed of 10-100 m per minute.
  • the present invention relates to the retrofitting or conversion of a paper machine to a device, as described above for carrying out a method, as also explained above.
  • the method for retrofitting a cleaning system for cleaning a circulating conveyor belt of a paper machine is characterized in that an existing device in which a liquid can be applied via arranged on a spray bar nozzles in liquid form or in the form of a spray on a conveyor belt specifically is modified.
  • FIG. 1 shows a schematic representation of a device with which a conveyor belt 17 in a paper machine 19 (or a downstream unit) can be cleaned.
  • the conveyor belt 17 is the wet screen belt of a fourdrinier machine, but the cleaning device can equally be used for cleaning other conveyor belts in a paper machine and even for cleaning a round screen of a rotary screen machine.
  • the conveyor belt 17 has, for example, a width of 5.7 meters and is moved during normal operation at a speed of, for example, 900 m per minute. It is, for example, a paper machine for the production of paper from recycled material.
  • the cleaning device has a cleaning central unit 7.
  • This central unit is supplied from a detergent container 1 via a line 5 detergent.
  • the cleaning agent is conveyed by a pump, and then mixed with water.
  • the water from a second container 2 and a line 6 is provided, it is also possible to directly connect a fresh water line.
  • a valve 9 is arranged, which serves to adjust the supplied dilute detergent solution.
  • the central unit 7 can be set manually both with respect to the pump 8 and with respect to the valve 9, but preferably a control unit is provided which automatically controls this central unit, as well as the supply of compressed air described below.
  • a check valve 10 Downstream of the central unit 7, a check valve 10 is first arranged (this can also be arranged within the central unit 7), and then follows the actual mixing point 11, or the element in which the foam is generated.
  • compressed air 3 which can be controlled manually or automatically via a valve 4, fed. It is concretely compressed air with a pressure of 4 bar, which is supplied in a pipe of about 1.25 cm diameter. Furthermore, a check valve 12 and a pressure reduction element 13 are arranged in the supply line for compressed air.
  • the element 11 is a simple T-piece, with the cross section of the pipe when feeding the compressed air is 1/2 inch and Alphasolv® cleaning agent is supplied. The flow and pressure conditions lead to the fact that in this element 11 the diluted cleaning agent is almost completely converted into foam.
  • the foam produced in the element 11 is then fed via the foam feed line 21, which has a cross-sectional area similar to that of the spray bar, a spray bar 14 which is arranged parallel above the surface of the conveyor belt 17 and perpendicular to the running direction (see arrow) of the conveyor belt ,
  • the length of the section 21 should have no curvature, and should have a length in the range of 0.5-2 m, so that the foam in this line section is not returned to the liquid phase.
  • the spray bar 14 has along its length on the bottom via inserts 15 with openings 18 through which the foam 16 emerges. Due to gravity, the foam falls in uniform distribution on the conveyor belt 17, which is typically moved forward in crawl, that is at a speed of about 70 m per minute. Approximately 4 1 cleaning agents per square meter of conveyor belt are applied in the form of foam.
  • the spray bar 14, as shown in the FIGS. 1 b) - d) is shown to be designed differently.
  • the spray bar 14 is a simple tube, for example with a circular cross-section, and with a diameter of 2 inches, that is 5.08 cm.
  • 50 holes are drilled in the pipe 14 at a hole-to-hole distance of 10 cm, each hole having a diameter of 5-6 mm.
  • the sum of all cross-sectional areas of the holes 18 should be smaller than the cross-sectional areas of the spray bar.
  • the spray bar 14, in turn, with a diameter of 2 inches has a cross-sectional area of 19 cm 2 .
  • FIG. 1c Another construction is in Figure 1c ).
  • inserts 15 may be inserts which normally include nozzles for spraying cleaning fluid. These have been drilled out (or replaced by corresponding other inserts) in this embodiment, so that there are no longer any nozzles but rather larger openings 18 for the exiting foam 16.
  • an already existing cleaning system can be retrofitted by either drilling out or replacing the existing there nozzles for the application of cleaning liquid, and by additionally a unit for providing foam is grown.
  • FIG Figure 1d Another embodiment is shown in FIG Figure 1d ). It may prove advantageous for a better distribution of the foam 16 on the conveyor belt 17, the openings either not exactly at the lower edge 20 but eg something against the direction of the conveyor belt (see arrow) to arrange, or, as in Figure 1d ) is shown, the openings each to be arranged alternately offset. For a better distribution effect of the openings, the spray bar can also be moved during the application, for example along its axis to cover a wider area or to equalize the distance between the openings.

Landscapes

  • Cleaning By Liquid Or Steam (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Paper (AREA)

Claims (16)

  1. Dispositif de nettoyage de convoyeurs circulants (17) d'une machine à papier (19), dans lequel on a disposé des moyens (1-13) pour préparer de la mousse (16), caractérisé en ce que la mousse (16) est déposée sur le convoyeur (17) au moyen d'au moins un tube de projection (14) par l'intermédiaire d'une pluralité d'ouvertures (15, 18).
  2. Dispositif selon la revendication 1, caractérisé en ce que les ouvertures (15, 18) sont des perçages (18) dans le tube de projection (14), dans lequel la somme des surfaces des sections transversales de tous les perçages d'une rampe de projection (14) est inférieure ou égale à la surface de la section transversale de la rampe de projection (14).
  3. Dispositif selon la revendication 2, caractérisé en ce que la somme des surfaces des sections transversales de tous les perçages (18) d'un tube de projection (14) est inférieure à la surface de la section transversale de la rampe de projection (14).
  4. Dispositif selon l'une quelconque des revendications 2 ou 3, caractérisé en ce qu'il y a au moins 3, de préférence au moins 5 à 20 perçages (18) par mètre courant de le tube de projection (14), et les perçages (18) présentent chaque fois une surface de section transversale de l'ordre de 7 à 100 mm2, de préférence de l'ordre de 20 à 150 mm2, ou en ce que les perçages (18) présentent une ouverture circulaire ayant un diamètre intérieur de l'ordre de 3 à 10 mm, de préférence de l'ordre de 4 à 7 mm.
  5. Dispositif selon l'une quelconque des revendications 2 à 4, caractérisé en ce qu'un tube de projection (14) présente une surface de section transversale de l'ordre de 500 à 4000 mm2, de préférence de l'ordre de 1000 à 3500 mm2, ou en ce qu'un tube de projection tubulaire (14) présente une surface de section transversale intérieure circulaire avec un diamètre de l'ordre de 25 à 110 mm, de préférence de l'ordre de 40 à 80 mm.
  6. Dispositif selon l'une quelconque des revendications 2 à 5, caractérisé en ce que les perçages (18) sont disposés essentiellement sur une rangée ou en décalage alterné sur la face inférieure du tube de projection (14), tournée vers le convoyeur (17) et en ce qu'ils présentent de préférence chaque fois un espacement de 50 - 200 mm, en particulier de préférence un espacement de 50 - 150 mm.
  7. Dispositif selon l'une quelconque des revendications 2 à 6, caractérisé en ce que l'au moins un tube de projection (14) est disposée au-dessus et essentiellement perpendiculairement à la direction de défilement du convoyeur (17), et parallèlement à la surface de celui-ci, de préférence à une distance de 50 - 500 mm, en particulier de 150 - 250 mm de la surface du convoyeur (17).
  8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens (1-13) de préparation continue de mousse (16) comprennent des moyens (1, 2, 5-10) pour amener une solution de préférence aqueuse d'agent de nettoyage (1) ainsi qu'au moins un élément (11) pour produire la mousse par une addition ciblée de gaz (3).
  9. Dispositif selon la revendication 8, caractérisé en ce que le gaz (3) est ajouté sous la forme d'air comprimé à l'élément (11), qui est de préférence une pièce en T (11), en particulier de préférence sous une pression de l'ordre de 2 à 6 bars.
  10. Dispositif selon l'une quelconque des revendications 8 ou 9, caractérisé en ce que des conduites (21) essentiellement sans courbes, d'une longueur ne dépassant pas 0,5 à 2 m, sont disposées entre l'élément (11) et la rampe de projection (14).
  11. Dispositif selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'un agent de nettoyage est ajouté à partir d'un réservoir d'agent de nettoyage (1) à une unité centrale de nettoyage (7), est mélangé dans cette dernière éventuellement en un rapport souhaité avec de l'eau ajoutée (2), et ce mélange ou l'agent de nettoyage est finalement ajouté à l'élément (11), éventuellement par une soupape (9) et/ou un clapet anti-retour (10).
  12. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on a disposé en plus des moyens de rinçage, en particulier à l'eau, qui peuvent en l'occurrence être également la rampe de projection (14), qui est à cet effet commandée de manière différente, et/ou des moyens d'aspiration de l'agent de nettoyage et/ou de l'eau.
  13. Procédé de nettoyage d'un convoyeur circulant (17) d'une machine à papier (19), caractérisé en ce que l'on prépare une mousse (16) et on l'envoie à au moins un tube de projection (14), et en ce que l'on dépose la mousse (16) sur le convoyeur (17) au moyen du tube de projection (14) par l'intermédiaire d'une pluralité d'ouvertures (15, 18), dans lequel en particulier la somme des surfaces des sections transversales de tous les perçages d'un tube de projection (14) est inférieure ou égale à la surface de la section transversale de la rampe de projection (14).
  14. Procédé selon la revendication 13, caractérisé en ce que l'on utilise un dispositif selon l'une quelconque des revendications 1 à 12.
  15. Procédé selon l'une quelconque des revendications 13 ou 14, caractérisé en ce que l'on effectue le nettoyage pendant l'arrêt de la machine à papier, dans lequel on traite le convoyeur (17) avec la mousse (16) soit à l'arrêt soit en continu, et dans lequel on dépose de manière particulièrement préférée de l'ordre de 0,1 - 6 1/m2 de mélange de nettoyage et de manière particulièrement préférée on déplace le convoyeur (17) avec une vitesse de 10 - 100 m par minute.
  16. Procédé de rééquipement d'une installation de nettoyage pour le nettoyage d'un convoyeur circulant (17) d'une machine à papier (19), dans laquelle on peut déposer un liquide sous forme liquide ou sous la forme d'un brouillard pulvérisé sur un convoyeur (17) au moyen de buses disposées sur une rampe de projection (14), caractérisé en ce qu'au moins quelques-unes des buses sont percées et/ou sont remplacées par des pièces rapportées avec des ouvertures (15), et éventuellement quelques-unes des buses sont fermées, dans lequel on assure que la somme des surfaces des sections transversales de toutes les ouvertures d'un tube de projection (14) est inférieure ou égale à la surface de la section transversale du tube de projection (14), et en ce qu'il est prévu des moyens (1-13) pour préparer de la mousse (16), de préférence en continu.
EP05108022A 2005-09-01 2005-09-01 Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier Expired - Lifetime EP1760191B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL05108022T PL1760191T3 (pl) 2005-09-01 2005-09-01 Urządzenie i sposób oczyszczania taśm transportowych i tkanin maszyny papierniczej
DE502005005269T DE502005005269D1 (de) 2005-09-01 2005-09-01 Vorrichtung und Verfahren zur Reinigung von Transportbändern und Geweben insbesondere bei Papiermaschinen
AT05108022T ATE407257T1 (de) 2005-09-01 2005-09-01 Vorrichtung und verfahren zur reinigung von transportbändern und geweben insbesondere bei papiermaschinen
EP05108022A EP1760191B1 (fr) 2005-09-01 2005-09-01 Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05108022A EP1760191B1 (fr) 2005-09-01 2005-09-01 Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier

Publications (2)

Publication Number Publication Date
EP1760191A1 EP1760191A1 (fr) 2007-03-07
EP1760191B1 true EP1760191B1 (fr) 2008-09-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05108022A Expired - Lifetime EP1760191B1 (fr) 2005-09-01 2005-09-01 Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier

Country Status (4)

Country Link
EP (1) EP1760191B1 (fr)
AT (1) ATE407257T1 (fr)
DE (1) DE502005005269D1 (fr)
PL (1) PL1760191T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102514910A (zh) * 2011-11-23 2012-06-27 巴彦淖尔盛安化工有限责任公司 一种防止乳化炸药在输送机皮带表面粘结的方法
CN103726385B (zh) * 2014-01-02 2016-03-02 玖龙纸业（太仓）有限公司 干网保洁装置
CN104018385B (zh) * 2014-06-10 2016-03-16 丁鉴群 一种生产玻璃纤维纸的长网造纸机喷淋机构
CN104343038B (zh) * 2014-11-04 2016-08-24 中国轻工业南宁设计工程有限公司 浆板机防纸幅上翻的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7208700A (fr) * 1971-06-24 1972-12-28
SE380557B (sv) * 1974-03-08 1975-11-10 Nordiska Maskinfilt Ab Anordning for nedslagning av pappersbana fran vira i pappersmaskin
US6468397B1 (en) * 1999-12-20 2002-10-22 Kimberly-Clark Worldwide, Inc. Scarfing shower for fabric cleaning in a wet papermaking process

Also Published As

Publication number Publication date
DE502005005269D1 (de) 2008-10-16
EP1760191A1 (fr) 2007-03-07
ATE407257T1 (de) 2008-09-15
PL1760191T3 (pl) 2009-02-27

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