EP1760191A1 - 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
EP1760191A1
EP1760191A1 EP05108022A EP05108022A EP1760191A1 EP 1760191 A1 EP1760191 A1 EP 1760191A1 EP 05108022 A EP05108022 A EP 05108022A EP 05108022 A EP05108022 A EP 05108022A EP 1760191 A1 EP1760191 A1 EP 1760191A1
Authority
EP
European Patent Office
Prior art keywords
spray bar
cleaning
conveyor belt
foam
cross
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.)
Granted
Application number
EP05108022A
Other languages
German (de)
English (en)
Other versions
EP1760191B1 (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 AT05108022T priority Critical patent/ATE407257T1/de
Priority to DE502005005269T priority patent/DE502005005269D1/de
Priority to EP05108022A priority patent/EP1760191B1/fr
Priority to PL05108022T priority patent/PL1760191T3/pl
Publication of EP1760191A1 publication Critical patent/EP1760191A1/fr
Application granted granted Critical
Publication of EP1760191B1 publication Critical patent/EP1760191B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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. There 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. are deposited during operation on and in such conveyor belts 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 then 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. Is possible, for example, the use of Alphasolv ® AP 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 supply 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 aligned ,
  • 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 may, as shown in Figures 1 b) - d), be designed differently.
  • Figure 1b) the simplest construction is shown.
  • 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 shown in Figure 1c).
  • This is a spray bar 14, which has at the lower edge 20 via recesses, in which inserts 15 are used.
  • 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. 1d Yet another embodiment is shown in Figure 1d). It may prove to be advantageous for a better distribution of the foam 16 on the conveyor belt 17, the openings either not exactly on 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 to arrange the openings each offset alternately.
  • 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)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Paper (AREA)
EP05108022A 2005-09-01 2005-09-01 Dispositif et procédé de nettoyage de convoyeurs et de toiles notamment utilisées dans une machine à papier Active EP1760191B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT05108022T ATE407257T1 (de) 2005-09-01 2005-09-01 Vorrichtung und verfahren zur reinigung von transportbändern und geweben insbesondere bei papiermaschinen
DE502005005269T DE502005005269D1 (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
PL05108022T PL1760191T3 (pl) 2005-09-01 2005-09-01 Urządzenie i sposób oczyszczania taśm transportowych i tkanin maszyny papierniczej

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

Family

ID=35613706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05108022A Active 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)

Cited By (3)

* 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
CN103726385A (zh) * 2014-01-02 2014-04-16 玖龙纸业（太仓）有限公司 干网保洁装置
CN104018385A (zh) * 2014-06-10 2014-09-03 丁鉴群 一种生产玻璃纤维纸的长网造纸机喷淋机构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2231141A1 (de) * 1971-06-24 1973-01-11 Applied Chem Pty Ltd Vorrichtung zur erzeugung von reinigungsschaum
DE2509020A1 (de) * 1974-03-08 1975-09-11 Nordiska Maskinfilt Ab Vorrichtung zum abtrennen einer papierbahn vom formdraht bei einer papierherstellungsmaschine
US6468397B1 (en) * 1999-12-20 2002-10-22 Kimberly-Clark Worldwide, Inc. Scarfing shower for fabric cleaning in a wet papermaking process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2231141A1 (de) * 1971-06-24 1973-01-11 Applied Chem Pty Ltd Vorrichtung zur erzeugung von reinigungsschaum
DE2509020A1 (de) * 1974-03-08 1975-09-11 Nordiska Maskinfilt Ab Vorrichtung zum abtrennen einer papierbahn vom formdraht bei einer papierherstellungsmaschine
US6468397B1 (en) * 1999-12-20 2002-10-22 Kimberly-Clark Worldwide, Inc. Scarfing shower for fabric cleaning in a wet papermaking process

Cited By (5)

* 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
CN103726385A (zh) * 2014-01-02 2014-04-16 玖龙纸业（太仓）有限公司 干网保洁装置
CN103726385B (zh) * 2014-01-02 2016-03-02 玖龙纸业（太仓）有限公司 干网保洁装置
CN104018385A (zh) * 2014-06-10 2014-09-03 丁鉴群 一种生产玻璃纤维纸的长网造纸机喷淋机构
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

Also Published As

Publication number Publication date
EP1760191B1 (fr) 2008-09-03
PL1760191T3 (pl) 2009-02-27
ATE407257T1 (de) 2008-09-15
DE502005005269D1 (de) 2008-10-16

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