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WO2008138683A1 - Procédé de nettoyage - Google Patents

Procédé de nettoyage Download PDF

Info

Publication number
WO2008138683A1
WO2008138683A1 PCT/EP2008/054085 EP2008054085W WO2008138683A1 WO 2008138683 A1 WO2008138683 A1 WO 2008138683A1 EP 2008054085 W EP2008054085 W EP 2008054085W WO 2008138683 A1 WO2008138683 A1 WO 2008138683A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
fibrous web
cleaning
roller
cleaning device
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.)
Ceased
Application number
PCT/EP2008/054085
Other languages
German (de)
English (en)
Inventor
Susanne Berger
Holger Humberg
Alexander Wohlmuth
Roland Mayer
Daniel Gronych
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 WO2008138683A1 publication Critical patent/WO2008138683A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/04—Doctors for drying cylinders

Definitions

  • the invention relates to a method for cleaning a running
  • the fibrous web in particular an uncoated and not highly compressed paper or board web, i. e.g. A web intended for newspaper printing and improved newsprint, which typically moves at high speed through the manufacturing machine, often removes particles from the web. These particles, in particular fiber parts, are only poorly bound to the web surface and constitute dust or impurities in the dry state of the web. These particles, in turn, later cause problems in the further processing of the fibrous web produced. Above all, if the fibrous web is to be printed later, the said particles can get on printing plates or blankets of the printing press, settle there and over a long period printing errors such as in particular so-called whitespots, i. small white unprinted stains, or so-called hickies, i. annular spots, cause.
  • whitespots i. small white unprinted stains
  • hickies i. annular spots
  • these particles are vascular cells from the eucalyptus tree, which in particular through the use of waste paper as a raw material, in particular copy paper in the newspaper get printing paper.
  • waste paper as a raw material
  • copy paper in the newspaper get printing paper.
  • even the smallest adhesive constituents can occur which bring about comparable printing defects.
  • the mentioned printing problems occur in particular when, in the production of the paper, the relevant fibrous web for dewatering has passed through a compact 3-nip press such as, for example, a DuoCentri II or DuoCentri Nipcoflex press.
  • a compact 3-nip press such as, for example, a DuoCentri II or DuoCentri Nipcoflex press.
  • the pulp or paper web usually comes in the first nip with a felt on the bottom in contact.
  • the two subsequent nips only the top of the web comes into contact with a felt while the bottom is in contact with a smooth roll.
  • the paper is more compacted on the felt-contacting upper side than on the side facing a smooth roller.
  • the corresponding compaction has a decisive influence on the binding of the vascular cells and particles to the web surface, which is due to the lower hydraulic and larger back pressure on the felted side.
  • a draft is directed to the web which separates the dust from the surface of the web.
  • a suction effect is applied to the web to remove the dust.
  • vortex flow is generated before the dust-separating blowing, to prevent the transport of the dust into the environment and to compensate for the suction effect.
  • a device for preventing deposits of hydrophobic impurities on a fibrous web has a take-off element, in particular a roller or endless belt or sieve with adsorption capacity. These take-off elements absorb the debris from the fibrous web, thereby cleaning the web. During the acceptance or cleaning, the fibrous web runs over drying cylinders of the last and / or penultimate drying group of the web production machine. It should also be mentioned that today's fibrous webs are often made for reasons of economy in a large width of about 10 m. Accordingly, the range of cleaning the fibrous web is correspondingly wide, which increases the expense of cleaning.
  • the detachment of such loose and / or unbound particles from the fibrous web is to be optimized, which can cause hickies or whitespots during later printing of newsprint in the offset process.
  • the small adhesive components mentioned in the introduction should also be included.
  • the object of the invention is achieved by a method according to claim 1. According to the invention, it is accordingly provided that the cleaning device acts on the fibrous web which has already been dried in a drying section of the production machine.
  • the fibrous web has such a high strength that the direct action with a cleaning device no longer harms her.
  • the final quality of the fibrous web produced is thereby higher than before. It is achieved by the method according to the invention that no particles or at least only very few particles dissolved from the fibrous web are located on the web at the end of an online or offline production process. As a result, especially the risk of printing errors, z. B. so-called hickies or whitespots in a later processing stage, ie in the printing of the web by offset printing, avoided, but at least reduced.
  • the cleaning method according to the invention can also be applied, as stated, in offline production methods.
  • the fibrous web is also after the drying of the web, but before the reel or only in the so-called finishing machine, i. cleaned in the calender after unwinding.
  • the method according to the invention can be used particularly advantageously on the side of the fibrous web which has been less compacted in the press section and / or former section or has been compacted too low in absolute terms.
  • a high compression takes place, for example, in the press section on the side of the paper web, in the direction of which much and severely dehydrated. This is typically the side which is often in contact with a dewatering belt such as a felt in a dewatering zone such as a press nip. In these cases, it is therefore advantageous to clean the opposite side, ie the less compressed side. If the drainage as a whole is very gentle, ie both sides are less compacted, then the cleaning according to the invention can be applied on both sides.
  • the upper side of the fibrous web is also cleaned. Cleaning is thus carried out on both sides of the web. Both web pages can be cleaned both simultaneously and successively. Decisive for this is the strength and strength of the fibrous web and also the available space within the manufacturing or finishing machine.
  • the fibrous web is moistened before cleaning. This dissolves little bound particles.
  • the usual process of adding printing ink and dampening water to offset printing is already anticipated.
  • the cleaning method according to the invention can be carried out, for example, with at least one brush extending over the width of the fibrous web or traversing across the web width.
  • at least one brush extending over the width of the fibrous web or traversing across the web width.
  • a plurality of juxtaposed Single brushes which can also be subjected to different pressure forces.
  • the brush or brushes may be round brushes or designed as roller brushes and should preferably rotate in opposite directions to the direction of the fibrous web. But there are also fixed brushes, such as flat brushes possible.
  • At least one scraper and / or at least one air nozzle and / or at least one suction device-the latter for discharging the brushed, scraped off or blown-off particles can be used alternately to the brushes.
  • the air nozzles can work at high pressure and be designed as slit nozzles.
  • roller may therefore have a special plastic cover which acts adhesively.
  • this plastic material can be used for the web tapping, endless belt.
  • a cleaning device with at least one brush arrangement, at least one coating strip arrangement and / or at least one roller or belt arrangement with adhesiveness is used.
  • a brush arrangement with at least one rotating in or against the web running circular brush can be used.
  • a brush assembly with at least one stationary brush is conceivable.
  • a Streichangnan angel is used with at least one stationary fixed coating strip.
  • a coating strip arrangement with at least one rotating roller can also be used.
  • a coating strip arrangement with at least one rotating roller it is advantageous if its rotational speed deviates from the web running speed, wherein the relative speed of the roller is in particular greater than 5% and preferably greater than 10% of the web running speed.
  • the described cleaning options can each be applied individually, but are also applicable in combination, whereby the cleaning effect increases.
  • the cleaning device acts on a fibrous web which has been compacted on one side and which has previously been guided through a section which compresses on one side, in particular a press arrangement of the production machine which compresses on one side.
  • the fibrous web can be previously characterized in particular by a one-side compacting 3-nip compact press arrangement, preferably by a 3-nip press.
  • Compact press assembly be performed with a shoe press as a third press.
  • the cleaning device is tion preferably arranged on the side of the fibrous web at which the lower compression is present.
  • the cleaning device is to act on a fibrous web having a lower compression on its underside
  • the cleaning device is preferably arranged on the underside of the fibrous web.
  • the process according to the invention can be used particularly advantageously if the waste paper (DIP) content as a fiber raw material is> 5%, in particular> 30%.
  • DIP waste paper
  • the process according to the invention is particularly suitable in the production of newsprint.
  • the method according to the invention can be applied to papers which are printed by offset printing.
  • the same components are provided with the same reference numerals.
  • Figures 1 to 3 the last two drying cylinders 1 and 2, which here for example part of a single-row dryer section 3 of a web-making machine 4 are shown.
  • the fibrous web 6 runs in the direction L of a cleaning device 7 to.
  • the fibrous web 6 is an uncoated and not highly compressed (as a rule made from waste paper) paper web for newspaper printing.
  • Such papers often have particles on their surface which are only poorly bound to the surface or poorly bound in vascular cells. These particles can cause considerable printing errors in the later printing process (newsprint printing). Therefore, a cleaning of the finished dried fibrous web 6 is performed according to the invention.
  • suction 8 is shown by way of example.
  • the vertically drawn hollow arrows 8a and 8b are intended to indicate the withdrawal direction or removal direction for the unwanted particles 9 detached with the cleaning device 7.
  • Figure 1 shows a first variant of the cleaning of this fibrous web 6.
  • a cleaning device 7 here is a web-width, rotating brush roller 7.1 is provided.
  • this brush roller or else the plurality of brushes arranged next to one another or even the web width it is also possible for one or more adhesion rollers to be used 7.2 be provided.
  • the Adäsionswalze has, as its name implies, a roll cover with adhesion properties. The loose particles are thus detached The adhesion roller 7.2 but itself must be freed from the adhering, ie the removed from the fibrous web 6 particles 9, which is why one of these roller / rollers 7.2 assigned / associated scraper is / are present.
  • Such a scraper is designated 7.2.1.
  • FIG. 2 shows a second variant of the cleaning option, in which high-pressure air nozzles 7.3 are provided for detaching the particles 9.
  • FIG. 3 shows the possible use of fixed brushes 7.4 or scrapers 7.5 acting on the fibrous web 6.
  • FIG. 4 shows a further variant of the cleaning possibility, in which the cleaning device 7 acts on a fibrous web 6 which has been compacted on one side and which has previously been guided through a section compressed on one side, in this case a press arrangement 10 of the production machine 4 which compresses on one side.
  • the one-side compacting press arrangement 10 may comprise, for example, a 3-nip compact press arrangement, preferably a 3-nip compact press arrangement with a shoe press as the third press.
  • the 3-nip compact press assembly 10 comprises a DuoCentri press assembly in which the fibrous web 6 is removed by a first felt 12 from a traveling belt 14, e.g. Suction roller 16 and a Ge genwalze 18 formed first nip 20 is supplied.
  • the counter-roller 18 may be, for example, a hard roller or a shoe press roller.
  • the fibrous web is guided together with the first felt 12 and guided around the counter-roller 18 second felt 22 through the first nip 20. This first nip 20 is thus double-felted.
  • the fibrous web is guided together with the first felt 12 around the suction press roll 16 and subsequently transferred to another roll or central roll 24, which together with the suction press roll 16 forms a second nip 26, through which the fibrous web 6 is passed.
  • This second nip 26 is simply felted, wherein the upper side of the fibrous web 6 is in contact with the relevant felt 12.
  • the fibrous web 6 is guided without the second felt 12 on the further roller 24 to a third nip 28 which is formed between the further roller 24 and, for example, a shoe press roll 30, around which a third felt 32 is guided ,
  • the optionally extended in the direction of web travel L third nip 28 is thus again simply felted, again in the present case the top of the fibrous web 6 comes into contact with the relevant felt 32.
  • the fibrous web 6 passes through a drying section 3, of which initially only two drying cylinders 1 with a suction deflecting roller 34 arranged therebetween are shown. Starting from a last roller, for example the last drying cylinder 1, the drying section 3, the fibrous web 6 is fed via guide rollers 5 a reel 36.
  • the fibrous web 6 is acted upon by the cleaning device 7.
  • the cleaning device 7 is arranged on the underside 6b of the fibrous web 6 having the lower compression.
  • the cleaning can take place, for example, in a region in which the fibrous web 6 is guided at least substantially horizontally. In this case, as already mentioned, only the web underside 6b is acted upon by the cleaning device 7.
  • roller 30 forming the third nip 28 with the further or central roller 24 it may in principle be, for example, also a hard roller instead of a shoe press roller.
  • the cleaning device 7 may comprise one or more identical or different contact or cleaning elements for removing particles from the less compressed web surface.
  • a combination of a 3-nip compact press is preferably conceivable with shoe press 24, 30 in the third position with a cleaning device 7, for example, at least a brush and / or a coating element and / or an adhesive roller or belt and can be arranged either after the drying section 3 before the reel 36 or on the slitter winder.
  • the one or more contact or cleaning elements sit on the side of the paper, which undergoes a lower compression in the press assembly 10. This is the bottom of a DuozentriNipcoFlex press assembly.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de nettoyage d'une bande (6) de papier, de carton ou d'une autre matière fibreuse défilant lors de sa production dans une machine de production (4). Selon ce procédé, la bande de matière fibreuse (6) est débarrassée de particules (9) indésirables détachées ou non liées. Selon l'invention, le dispositif de nettoyage (7) agit sur la surface ou sur la face (6a, 6b) de la bande (6) de matière fibreuse, dont le séchage est achevé déjà dans une partie sèche (3) de la machine de production (4).
PCT/EP2008/054085 2007-05-15 2008-04-04 Procédé de nettoyage Ceased WO2008138683A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710022810 DE102007022810A1 (de) 2007-05-15 2007-05-15 Reinigungsverfahren
DE102007022810.6 2007-05-15

Publications (1)

Publication Number Publication Date
WO2008138683A1 true WO2008138683A1 (fr) 2008-11-20

Family

ID=39629026

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/054085 Ceased WO2008138683A1 (fr) 2007-05-15 2008-04-04 Procédé de nettoyage

Country Status (2)

Country Link
DE (1) DE102007022810A1 (fr)
WO (1) WO2008138683A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023200337A1 (de) 2023-01-17 2024-07-18 Robert Bosch Gesellschaft mit beschränkter Haftung Reinigung schnelllaufender Bahnen und Segmente

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519757A (en) * 1984-01-17 1985-05-28 Magna-Graphics Corporation Web surface treating apparatus
DE3800669A1 (de) * 1988-01-13 1989-07-27 Ltg Lufttechnische Gmbh Vorrichtung zur staubabsaugung am trocknungszylinder einer papiermaschine
US5635031A (en) * 1995-07-06 1997-06-03 Valmet Corporation Method in a paper machine or in a finishing device of a paper machine for collecting and removing dust separated from a web
DE19736847A1 (de) * 1997-08-23 1999-02-25 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Vermeidung von Ablagerungen hydrophober Störstoffe
DE20300919U1 (de) * 2003-01-22 2003-04-03 Voith Paper Patent GmbH, 89522 Heidenheim Breitnip-Kalander

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239863A (en) 1963-08-19 1966-03-15 Thomas A Gardner Pressure gradient web cleaning apparatus
FI104099B1 (fi) 1996-10-25 1999-11-15 Valmet Corp Menetelmä ja laite paperikoneella tai vastaavalla tai sen jälkikäsittelylaitteella pölyn poistamiseksi

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519757A (en) * 1984-01-17 1985-05-28 Magna-Graphics Corporation Web surface treating apparatus
DE3800669A1 (de) * 1988-01-13 1989-07-27 Ltg Lufttechnische Gmbh Vorrichtung zur staubabsaugung am trocknungszylinder einer papiermaschine
US5635031A (en) * 1995-07-06 1997-06-03 Valmet Corporation Method in a paper machine or in a finishing device of a paper machine for collecting and removing dust separated from a web
DE19736847A1 (de) * 1997-08-23 1999-02-25 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Vermeidung von Ablagerungen hydrophober Störstoffe
DE20300919U1 (de) * 2003-01-22 2003-04-03 Voith Paper Patent GmbH, 89522 Heidenheim Breitnip-Kalander

Also Published As

Publication number Publication date
DE102007022810A1 (de) 2008-11-20

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