EP2122049B1 - Method and apparatus for drying a fibrous web - Google Patents

Method and apparatus for drying a fibrous web Download PDF

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Publication number
EP2122049B1
EP2122049B1 EP07857911.7A EP07857911A EP2122049B1 EP 2122049 B1 EP2122049 B1 EP 2122049B1 EP 07857911 A EP07857911 A EP 07857911A EP 2122049 B1 EP2122049 B1 EP 2122049B1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
characterized
steam
belt
apparatus according
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 - Fee Related
Application number
EP07857911.7A
Other languages
German (de)
French (fr)
Other versions
EP2122049A1 (en
Inventor
Luiz Carlos Da Silva
Thomas Scherb
Peter Kahl
Frank Wegehaupt
Dieter Müller
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
Priority to DE200610062234 priority Critical patent/DE102006062234A1/en
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to PCT/EP2007/064290 priority patent/WO2008077869A1/en
Publication of EP2122049A1 publication Critical patent/EP2122049A1/en
Application granted granted Critical
Publication of EP2122049B1 publication Critical patent/EP2122049B1/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/18Drying webs by hot air
    • D21F5/182Drying webs by hot air through perforated cylinders
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14Making cellulose wadding, filter or blotting paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14Making cellulose wadding, filter or blotting paper
    • D21F11/145Making cellulose wadding, filter or blotting paper including a through-drying process
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0272Wet presses in combination with suction or blowing devices
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/20Waste heat recovery
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00Other details of machines for making continuous webs of paper
    • D21F7/008Steam showers
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00Complete machines for making continuous webs of paper
    • D21F9/003Complete machines for making continuous webs of paper of the twin-wire type

Description

  • The invention relates to a method for drying a fibrous web, in particular paper, board or tissue web, in which the continuous fibrous web is acted upon in the region of a predeterminable drying zone, with hot air and at least partially with steam. It further relates to a corresponding drying device and a machine for producing a tissue web with such a drying device.
  • In the WO 2005/075737 A1 A method of the type mentioned above is already described, which serves to produce a voluminous tissue web and in which a so-called belt press in conjunction with a hot air hood or alternatively a steam hood for dewatering the fibrous web is used up to a certain Trockengehaft. With tissue machines, it is important to reduce energy consumption, especially during the drying process, to achieve a predefined dry content. On the other hand, there is a need for an increase in dry content with low energy consumption.
  • The document WO 2005/073461 further describes a papermaking process with through-air drying. The energy efficiency is improved by using the exhaust air of one or more throughflow dryers to profit from the dry content of the fibrous web before the throughflow drying.
  • In the document US5974691 Also disclosed is a method for drying a fibrous web. The fibrous web is transported and supported on a permeable loading tension. In this case, a hot air flow of high speed through the fibrous web is generated by acting on the underside of the permeable fabric vacuum.
  • The invention has for its object to provide an improved method and an improved device of the type mentioned, in which the drying process, preferably for the aforementioned method for producing a tissue web, in particular with regard to the energy requirements for the dewatering of the fibrous web is optimized.
  • With regard to the method, this object is achieved in that the fibrous web viewed in the web running direction is applied within the first half of the total length of the drying zone with steam and that the fibrous web viewed in the web running direction is first applied with steam and then with hot air.
  • For drying the fibrous web, preferably tissue web, so hot air and steam is used in combination with each other.
  • Preferably, in this case, the fibrous web is considered in the web running direction, at least at the beginning of the drying zone with steam.
  • The fibrous web is viewed in the web running direction initially charged with steam and then with hot air.
  • However, according to an alternative expedient embodiment of the method according to the invention, it is also possible to apply steam to the fibrous web at least substantially only within the first half of the total length of the drying zone, in which case the fibrous web is preferably at least substantially only when viewed in the web running direction Steam is applied over the first half of the total length of the drying zone.
  • According to a further advantageous embodiment, the fibrous web is viewed in the web running direction at least substantially only within the first
  • Third of the total length of the drying zone, and thereby preferably applied at least substantially over this first third of time with steam.
  • In certain cases, it is also advantageous if the fibrous web is considered in the web running direction at least substantially only within the first quarter of the total length of the drying zone, and in this case preferably at least substantially over this first quarter away steam is applied.
  • According to a further alternative embodiment of the method according to the invention, the fibrous web, viewed in the web running direction, is acted upon with steam only at the beginning of the drying zone.
  • Preferably, the fibrous web is acted upon over the predetermined drying path away with hot air. At least in this case, the drying zone can be defined at least substantially by the area in which hot air is applied to the fibrous web. In this case, the fibrous web can be acted upon in particular within and / or before this drying zone with steam.
  • Conveniently, viewed in the web running direction, the fibrous web is subjected at least in some areas at the same time both to hot air and to steam. Under a simultaneous admission is to be understood in each case that a respective point of the fibrous web is acted upon both with hot air and with steam.
  • According to an expedient practical embodiment, the fibrous web together with a permeable band, in particular structured band or TAD band (TAD = Through Air Drying) are passed through the drying zone, in which case first the fibrous web and then the permeable band of the hot air or the steam, as far as this is not yet in the train is condensed, to be flowed through. The combined hot-air and steam application according to the invention can thus also be applied, for example, to a TAD-drying process.
  • A preferred alternative embodiment of the method according to the invention is characterized in that the fibrous web is passed through the drying zone together with at least one permeable band, in particular a structured band, whereby first the permeable band and then the fibrous web are flowed through by the hot air or the steam ,
  • In this case, the fibrous web in the drying zone can advantageously be covered by at least one further permeable band, in particular press belt, in which case first the further permeable band or press belt, then the first permeable band or structure band and finally the fibrous web of the hot air or hotfibre web The steam is flowed through. This results in the use of a press belt, a kind of belt press, in which then in addition to the mechanical pressure in particular the combined hot air and steam drying according to the invention is applied.
  • In addition, a dewatering belt, in particular felt belt, can be guided through the drying zone together with the fibrous web, wherein first the further permeable belt or press belt, then the first permeable belt or structure belt and the fibrous web and finally the additional dewatering belt from the hot air or the Steam to be flowed through, as far as this, as already mentioned, is not condensed in the web.
  • In principle, however, it is also conceivable to expose the fibrous web in the drying zone at least in regions to an impingement flow drying. In this case, therefore, the combined hot air and steam application according to the invention is used in the context of such an impingement flow drying.
  • In principle, however, the fibrous web can at least in some areas also be exposed to throughflow drying.
  • The object specified above is also achieved by a device for drying a fibrous web, in particular paper, board or tissue web with a drying zone, in the area of the current fibrous web can be acted upon with hot air, wherein. the fibrous web within the drying zone at least partially acted upon by steam and this device is characterized in that the fibrous web viewed in the web running within the first half of the total length of the drying zone, is acted upon by steam and the fibrous web viewed in the web running direction, first with steam and connect with Hot air can be acted upon.
  • Preferred embodiments of the device according to the invention are specified in the subclaims.
  • In this case, preferably at least one hot air hood is provided for loading the fibrous web with hot air. In this case, the drying zone can be defined in particular by the dimensions of the hot air hood. A steaming of the fibrous web is advantageously conceivable within and / or in particular before the drying zone.
  • For impinging the fibrous web with steam, at least one steam blowing device, in particular steam blow pipe or steam blow box, is advantageously provided.
  • The steam blower expediently extends at least substantially over the entire width of the hot air hood measured transversely to the web running direction.
  • It is particularly advantageous if the steam blower is at least partially disposed within the hot air hood.
  • However, according to a preferred alternative embodiment, the steam blowing device can also be arranged directly in front of the hot air hood, as viewed in the web running direction.
  • The relevant steam blower device can moreover be arranged, constructed and / or controlled so that the fibrous web, viewed in the direction of web travel, is acted upon by both hot air and steam at the same time over only a part of the total length of the drying zone or over the entire drying zone.
  • When the steam blower comprises a steam blow pipe, the diameter of the openings of this steam blow pipe is advantageously in a range of about 5 to about 1 mm, and preferably in a range of about 4 to about 2.5 mm. The diameter in question is preferably limited upwards, since a certain speed is required for the steam jet.
  • If the fibrous web in the region of the drying zone is covered by at least one permeable belt, for example a permeable press belt, then the distance between the steam blower and the outer permeable belt covering the fibrous web, for example a press belt, is preferably <30 mm, in particular <20 mm, in particular <15 mm and preferably ≤ 10 mm.
  • If the steam blower device comprises a steam blower tube, its openings can advantageously be arranged at a mutual distance <20 mm, in particular <10 mm and preferably <7.5 mm.
  • If the steam blowing device comprises at least one steam blower box, the moisture transverse profile of the fibrous web can advantageously be adjusted and / or regulated via this.
  • If the steam blowing device comprises at least one steam blow pipe, the dry content of the fibrous web can be influenced or adjusted and / or regulated at least substantially via this steam blow pipe.
  • In principle, the steam blower device may comprise only at least one steam blow box or only at least one steam blow pipe or else at least one steam blow box or at least one steam blow pipe.
  • If the fibrous web is covered by at least one permeable band in the area of the drying zone, means such as a scraper or the like are advantageously provided in order to remove the air boundary layer entrained with the outer permeable band covering the fibrous web prior to entry of the band into the drying area.
  • The hot air for the hot air hood of the drying zone may be at least partially removed from the hood associated with a drying cylinder, in particular a Yankee cylinder. Such energy recovery is possible because the temperature of the exhaust air from such hood associated with, for example, a Yankee cylinder is much higher than the temperature required for the hot air to supply the hot air hood to the drying zone. Thus, the temperature of the hood of a drying cylinder, such as in particular a Yankee cylinder removed hot air, for example, be about 300 ° C.
  • Preferably, the hot air hood of the drying zone is at least partially supplied with hot air, the temperature in a range <250 ° C, in particular <200 ° C and preferably in a range of about 150 ° C to about 200 ° C.
  • The temperature of the hot air for supplying the hot air hood can be adjusted and / or regulated in accordance with the energy consumption in order to optimize the operating point. A higher temperature would usually not result in more efficient drying.
  • According to a preferred practical embodiment, at least one evacuated device, in particular suction box and / or suction roller, is arranged in the region of the drying zone on the side of the fibrous web or the additional dewatering belt facing away from the hot air hood.
  • In this case, the evacuated device may in particular comprise a suction roll with a suction box defining a suction zone.
  • As already mentioned, a band press is preferably formed by a further permeable band as a press belt under tension. In this case, the press belt is preferably under a high tension in a range of about 40 to about 60 kN / m to thereby exert a pressing pressure in a press zone, which is preferably in a range of about 0.5 to about 1.5 bar. It is also of particular advantage if the length of the press zone formed by the permeable press belt 80, viewed in the web running direction, is at least essentially defined by the wrap area over which the press belt wraps around the suction roll.
  • The length of the press zone formed by the permeable press belt, as considered in the web running direction, can in particular also correspond at least substantially to the length of the suction zone or of the suction box of the suction roll.
  • The drying zone may be shorter than the pressing zone when viewed in the web running direction. In certain cases, however, it is also advantageous if the press zone in the web running direction is equal to or longer than the press zone.
  • The flow rate (l / min) of the steam is preferably less than the flow rate (l / min) of the hot air. At atmospheric pressure, the flow rate of the vapor may advantageously be less than 0.5 times, in particular less than 0.3 times, and preferably less than 0.2 times, the flow rate of the hot air.
  • The steam causes an increase in the temperature of the fibrous web to reduce the viscosity of the water in the fibrous web. For this purpose, the steam in the fibrous web, in particular tissue web, must condense, since thereby the relevant temperature increase is achieved. This temperature increase can be adjusted for example by an appropriate choice of the correct temperature level for the hot air.
  • The temperature of the hot air impinging on the fibrous web is thus preferably adjustable, in particular for influencing the condensation of the steam in the fibrous web.
  • If the temperature is too low, the steam condenses immediately before entering the fibrous web. This is because the steam is cooled by the housing of the hot air hood and by the incoming colder bands. This may occur in particular in the case of the use of a so-called belt press, since in this case the steam first has to penetrate two outer bands, namely the outer permeable band, in particular press belt, and optionally a permeable structured band, before it enters the fibrous web.
  • If the fibrous web is covered by a permeable press belt in the drying zone, it advantageously has a permeability of> 170 m 3 / h (> 100 cfm), in particular> 510 m 3 / h (> 300 cfm), in particular)> 850 m 3 / h (> 500 cfm) and preferably> 1189 m 3 / h (> 700 cfm, cfm = cubic feet per minute).
  • If the fibrous web is guided through the drying zone together with a permeable structured strip, this preferably has a permeability)> 170 m 3 / h (> 100 cfm), in particular> 510 m 3 / h (> 300 cfm), in particular> 850 m 3 / h (> 500 cfm) and preferably> 1189 m 3 / h (> 700 cfm).
  • It is particularly advantageous if the fibrous web is covered in the drying zone by a permeable press belt, which consists at least substantially of plastic, in particular polyamide, polyethylene, polyurethane, etc.
  • According to an alternative expedient embodiment of the device according to the invention, however, the fibrous web in the drying zone can also be covered by a permeable press belt, which is formed by a metal band.
  • Preferably, at least one belt guided through the drying zone together with the fibrous web is preheated in the web running direction in front of the drying zone. This is particularly useful in the case that a metal existing press belt is used.
  • For preheating advantageously a steam heater, an IR heater and / or a hot water heater is used.
  • A hot-water heating device is particularly suitable for an inner band guided through the drying zone together with the fibrous web, in particular an additional dewatering belt.
  • As already mentioned, the air separation layer entrained on the surface of the outer band may expediently be removed, for example, by means of a scraper extending over the width thereof in front of the hot air hood. This also brings a correspondingly higher temperature after it is avoided that the steam is cooled before entering the fibrous web. The temperature of the hot air can thus be chosen lower.
  • The invention also relates to a machine for producing a tissue web, which is characterized in that it comprises a drying device according to the invention.
  • The invention will be explained in more detail below with reference to exemplary embodiments with reference to the drawing; in this show:
  • Fig. 1
    a schematic representation of a conventional, only working with steam drying device and the corresponding dry content gain and the corresponding temperature profile,
    Fig. 2
    a schematic representation of a conventional, working only with hot air drying device and the corresponding dry content gain and the corresponding temperature profile,
    Fig. 3
    a schematic representation of an exemplary embodiment of a machine according to the invention for the production a tissue web with a drying device according to the invention and
    Fig. 4
    a simplified schematic representation of a modified embodiment of the drying device according to the invention and the corresponding dry content increase and the corresponding temperature profile.
  • Fig. 1 Fig. 1 schematically shows a conventional steam-only drying apparatus having a suction roll 12 having a suction zone 10 and a steam blowing box 14 opposite to the suction zone 10 in the starting region. The tissue web 16 is interposed between an inner dewatering belt 18 or felt and a structured belt 20 together with a outer, here made of metal press belt passed over the suction roller 12. The bands 18 to 20 are each permeable. The press belt 22 is guided over guide rollers 24 and presses the belts 18 to 22 and the tissue web 16 in the region of the suction zone 10 against the suction roller 12.
  • In the area of the steam blow box, the temperature T increases. Following this, however, the tissue web 16 already cools down strongly within the suction zone 10 with the intake ambient air. As is clear from the Fig. 1 results in a dry content increase of about 0.2%, and only in the area of the steam blower box 14.
  • Fig. 2 shows a schematic representation of a conventional, working only with hot air drying device. This drying apparatus comprises a suction roller 12 having a suction zone 10 and a hot air hood 26 extending opposite the suction zone 10 and extending over their entire length viewed in the web running direction L. The tissue web 16 is again between one permeable drainage belt 18 or felt and a permeable structured belt 20 together with an outer permeable press belt 22 made of metal over the suction zone 10 of the suction roll 12 out.
  • The dry content increment D in this drying apparatus, in which the tissue web 16 is dried by the hot air flowing therethrough, is about 1.5%. The temperature T increases in the region of the suction zone 10 and the hot air hood 26 only slightly.
  • Fig. 3 shows a schematic representation of an exemplary embodiment of a machine according to the invention 28 for producing a fibrous web, here for example a tissue web with a drying device 30 according to the invention.
  • The drying device 30 comprises a suction roll 32 having a suction zone 34 defined in particular by an integrated suction box and a hot air hood 36 assigned to the suction roll 32.
  • In this case, the fibrous web 38, here for example tissue web, is guided together with a permeable structured band 40 over the suction roll 32, the fibrous web 38 lying between the permeable structured band 40 and the suction roll 32. In addition, in the area of the suction zone 34 outside, a high-pressure permeable pressing belt 80 is wound around the suction roll 32, whereby a belt press is formed. This in the Fig. 1 only indicated press belt 80 is in the Fig. 4 to recognize even more clearly. The hot air from the hot air hood 36 thus flows successively through the permeable press belt 80, the permeable structured belt 40 and the fibrous web 38 into the suction zone 34 of the suction roller 32.
  • In addition, a dewatering belt 42, e.g. Felt, led to the suction roll 32, which is between the suction roll 32 and the permeable structured band 40 and through which the hot air flows into the suction zone 34 of the suction roll 32. In the present embodiment, therefore, the permeable press belt 80, the permeable structured belt 40, the fibrous web 38 and the dewatering belt 42 are successively flowed through by the hot air.
  • The running fibrous web 38 is thus applied over a drying zone away with hot air, said drying zone may be determined at least substantially by the hot air hood 36. In this case, this drying zone, viewed in the web running direction L, may for example extend at least essentially over the suction zone 34 of the suction roll 32 or, for example, beyond it.
  • According to the invention, the fibrous web 38 is now subjected to hot air in the area of this drying zone and at least partially to steam.
  • For this purpose, the fibrous web 38 viewed in the web running direction L can be acted upon at least at the beginning of the drying zone with steam. According to the present embodiment Fig. 3 is the fibrous web 38 viewed in the web running direction L only at the beginning of this drying zone exposed to steam. It is considered in the web running direction first with steam and then applied with hot air.
  • For impinging the fibrous web 38 with steam, at least one steam blower 44, in particular a steam blower pipe or steam blower box, is provided. In the present case, this steam blower 44 comprises a steam blow pipe, preferably provided at the beginning of the drying zone.
  • The steam blower 44 may extend at least substantially over the entire width of the hot air hood 36 measured transversely to the web running direction L. Advantageously, it is at least partially disposed within the hot air hood 36.
  • For example, based on the Fig. 4 can be seen, the steam blower 44, for example, include at least one steam blower box. Also in this case the steam blower box is again located at the beginning of the drying zone defined here at least substantially by the hot air hood 36 and at least substantially inside the hot air hood 36. Also in this case, the fibrous web 38 is thus initially charged with steam and then with hot air.
  • As based on the Fig. 3 can be seen, means such as a scraper 46 or the like may be provided to dissipate with the outer the fibrous web 38 covering the permeable structured band 40 entrained air separation layer before an entry of the belt 40 in the drying zone.
  • The machine 28 further comprises a former with two converging drainage belts 40, 48, wherein the inner belt simultaneously forms the permeable structured belt 40 in the present case. The two dewatering belts 40, 48 merge to form a pulp inlet gap 50 and are guided over a forming element 52 such as in particular a forming roller.
  • In the present case, therefore, the permeable structured band 40 is formed by the inner dewatering band of the former coming into contact with the forming element 52. The outer dewatering belt 48, which does not come into contact with the forming element 52, is separated again from the fibrous web 38 following the forming element 52.
  • By means of a headbox 54, the pulp suspension is introduced into the stock inlet gap 50.
  • Between the forming element 52 and the drying device 30, a suction element 56 may be provided, through which the fibrous web 38 is held on the permeable structured band 40 or pressed against this permeable structured band 40.
  • Following the drying device 30, the dewatering belt 42 is again separated from the permeable structured belt 40. In this case, behind the drying device 30, a pickup or separating element 58 is provided, through which the fibrous web 38 is held at the separation of the dewatering belt 42 to the permeable structured band 40.
  • Following this, the fibrous web 38 is guided together with the permeable structured band 40 through a press nip 64 formed between a drying cylinder 60 preferably formed by a Yankee cylinder and a pressing element 62 such as a press roll. The press element 62 in the present case is, for example, a shoe press roll. Behind the press nip 64, the permeable structured band 40 is again separated from the drying cylinder 60, while the fibrous web 38 remains on the drying cylinder 60. The drying cylinder 60 is associated with a hood 66.
  • Optionally, a vacuum box with a hot air hood 68 or the like may be provided between the suction roll 32 and the drying cylinder 60 to increase the sheet strength.
  • The hot air for the suction roll 32 associated hot air hood 36 may at least partially removed from the drying cylinder 60 associated hood 66 be. The hood 66 removed this hot air has a temperature, for example in the range of about 300 ° C, which is usually higher than that required for the hot air of the hot air box 36 te.
  • As based on the Fig. 3 can be seen, the hot cylinder associated with the drying cylinder hood 66 removed hot air of the hot air hood 36 can be supplied via a feed line 70, in which at least one valve 72, in particular control valve can be arranged. In addition, in this supply line 70, if necessary, a filter 74 may be provided for the removal of in particular short fibers, dust or the like. Finally, in this supply line 70, a fan may be arranged.
  • The hot air taken from the hood 60 associated with the cylinder 60 can also be mixed with cold air supplied via a line 76. Also in the line 76 for the supplied cold air again at least one valve 78, in particular control valve may be provided. About the mixing ratio of the hood 66 removed hot air and the cold air so the temperature of the hot air hood 36 supplied air can be adjusted.
  • Fig. 4 shows a simplified schematic representation of a modified embodiment of the drying device 30 according to the invention. As already mentioned, here the steam blower 44 comprises instead of a steam blow pipe at least substantially within the hot air hood 36 arranged steam blower box. This steam blower box, viewed in the web running direction L, is again provided at the beginning of the drying zone defined here at least essentially by the hot air hood 36.
  • The present embodiment differs from that of the Fig. 3 in addition to the fact that in addition to the permeable structured band 40 and the dewatering belt 42 or felt, a permeable press belt 80 together with the fibrous web 38 is passed through the drying zone, through which the permeable structured band 40, the fibrous web 38 and the permeable dewatering belt 42 in the region of the suction zone 34 are pressed against the suction roll 32.
  • The press belt 18 is viewed in the web running direction L before and behind the drying zone each guided around a guide roller 82, via which the relevant voltage for the press belt 80 is generated.
  • As based on the Fig. 4 can be seen, results in relation to the entire suction zone, which defines the drying zone here at the same time, a relatively high temperature T. Accordingly, there is also a relatively high dry content gain, here for example about 3%, a.
  • LIST OF REFERENCE NUMBERS
  • 10
    suction zone
    12
    suction roll
    14
    steam blow
    16
    tissue web
    18
    dewatering belt
    20
    structured band
    22
    press belt
    24
    guide roll
    26
    Hot air hood
    28
    machine
    30
    drying device
    32
    vacuumed device, suction roller
    34
    suction zone
    36
    Hot air hood
    38
    Fibrous web, in particular tissue web
    40
    permeable structured band
    42
    dewatering belt
    44
    Steam blower, steam pipe, steam box
    46
    scraper
    48
    dewatering belt
    50
    Stock inlet gap
    52
    Forming element, forming roller
    54
    headbox
    56
    suction
    58
    Pickup or separating element
    60
    Drying cylinder, Yankee cylinder
    62
    press member
    64
    press nip
    66
    Hood
    68
    Hot air hood
    70
    supply
    72
    Valve
    74
    filter
    76
    management
    78
    Valve
    80
    permeable press belt
    82
    guide roll

Claims (62)

  1. Method for drying a fibrous web (38), in particular a paper, board or tissue web, in which hot air is applied to the moving fibrous web (38) in the area of a predefinable drying zone, steam being applied to the fibrous web (38), at least in some areas, within the drying zone,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) within the first half of the overall length of the drying zone, and in that, viewed in the web running direction (L), first of all steam and then hot air are applied to the fibrous web (38).
  2. Method according to Claim 1,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) at least at the start of the drying zone.
  3. Method according to either of Claims 1 and 2,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) at least substantially only within the first half of the overall length of the drying zone.
  4. Method according to one of Claims 1 to 3,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) at least substantially only within the first third of the overall length of the drying zone.
  5. Method according to Claims 1 to 3,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) at least substantially over the first third of the overall length of the drying zone.
  6. Method according to one of Claims 1 to 4,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) at least substantially only within the first quarter of the overall length of the drying zone.
  7. Method according to Claims 1 to 5,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) at least substantially over the first quarter of the overall length of the drying zone.
  8. Method according to either of Claims 1 and 2,
    characterized in that
    viewed in the web running direction (L), steam is applied to the fibrous web (38) only at the start of the drying zone.
  9. Method according to one of the preceding claims,
    characterized in that
    hot air is applied to the fibrous web (38) over the predefinable drying zone.
  10. Method according to one of the preceding claims,
    characterized in that
    viewed in the web running direction (L), both hot air and steam are applied simultaneously to the fibrous web (38), at least in some areas.
  11. Method according to one of the preceding claims,
    characterized in that
    the fibrous web (38) is guided through the drying zone together with a permeable belt, in particular a structured belt or TAD belt, and the hot air and/or the steam flow/s firstly through the fibrous web and then through the permeable belt.
  12. Method according to one of Claims 1 to 10,
    characterized in that
    the fibrous web (38) is guided through the drying zone together with at least one permeable belt (40), in particular a structured belt, and the hot air and/or the steam flow/s firstly through the permeable belt (40) and then through the fibrous web (38).
  13. Method according to Claim 12,
    characterized in that
    in the drying zone, the fibrous web is covered by at least one further permeable belt (80), in particular a press belt, and the hot air and/or the steam flow/s firstly through the further permeable belt (80) or press belt, then through the first permeable belt (40) or structured belt and finally through the fibrous web (38).
  14. Method according to Claim 12 or 13,
    characterized in that
    together with the fibrous web (38), a dewatering belt (42), in particular a felt, is additionally guided through the drying zone, and, if appropriate, the hot air and/or the steam flow/s firstly through the further permeable belt (80) or press belt, then through the first permeable belt (40) or structured belt and the fibrous web (38) and finally through the additional dewatering belt (42).
  15. Method according to one of the preceding claims,
    characterized in that
    in the drying zone, the fibrous web (38) is subjected to impingement-flow drying, at least in some areas.
  16. Method according to one of the preceding claims,
    characterized in that
    in the drying zone, the fibrous web (38) is subjected to through-flow drying, at least in some areas.
  17. Apparatus (30) for drying a fibrous web (38), in particular a paper, board or tissue web, having a drying zone, in the area of which hot air can be applied to the moving fibrous web (38), in particular for carrying out the method according to one of the preceding claims, it being possible for steam to be applied to the fibrous web (38), at least in some areas, within the drying zone,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) within the first half of the overall length of the drying zone, and in that, viewed in the web running direction (L), first of all steam and then hot air can be applied to the fibrous web (38).
  18. Apparatus according to Claim 17,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) at least at the start of the drying zone.
  19. Apparatus according to either of Claims 17 and 18,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) at least substantially only within the first half of the overall length of the drying zone.
  20. Apparatus according to either of Claims 17 and 18,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) at least substantially only within the first third of the overall length of the drying zone.
  21. Apparatus according to either of Claims 17 and 18,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) at least substantially over the first third of the overall length of the drying zone.
  22. Apparatus according to one of Claims 17 to 20,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) at least substantially only within the first quarter of the overall length of the drying zone.
  23. Apparatus according to Claims 17 to 21,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) at least substantially over the first quarter of the overall length of the drying zone.
  24. Apparatus according to either of Claims 17 and 18,
    characterized in that
    viewed in the web running direction (L), steam can be applied to the fibrous web (38) only at the start of the drying zone.
  25. Apparatus according to one of the preceding Claims 17 to 24,
    characterized in that
    hot air is applied to the fibrous web (38) over the predefinable drying zone.
  26. Apparatus according to one of the preceding Claims 17 to 25,
    characterized in that
    viewed in the web running direction (L), both hot air and steam are applied simultaneously to the fibrous web (38), at least in some areas.
  27. Apparatus according to one of the preceding Claims 17 to 26,
    characterized in that
    the fibrous web (38) is guided through the drying zone together with a permeable belt, in particular a structured belt or TAD belt, and the hot air and/or the steam flow/s firstly through the fibrous web and then through the permeable belt.
  28. Apparatus according to one of Claims 17 to 24,
    characterized in that
    the fibrous web (38) is guided through the drying zone together with at least one permeable belt (40), in particular a structured belt, and the hot air and/or the steam flow/s firstly through the permeable belt (40) and then through the fibrous web (38).
  29. Apparatus according to Claim 28,
    characterized in that
    in the drying zone, the fibrous web (38) is covered by at least one further permeable belt (80), in particular a press belt, and the hot air and/or the steam flow/s firstly through the further permeable belt (80) or press belt, then through the first permeable belt (40) or structured belt and finally through the fibrous web (38).
  30. Apparatus according to Claim 28 or 29,
    characterized in that
    together with the fibrous web (38), a dewatering belt (42), in particular a felt, is additionally guided through the drying zone, and, if appropriate, the hot air and/or the steam flow/s firstly through the further permeable belt (80) or press belt, then through the first permeable belt (40) or structured belt and the fibrous web (38) and finally through the additional dewatering belt (42).
  31. Apparatus according to one of the preceding Claims 17 to 30,
    characterized in that
    in order to apply hot air to the fibrous web (38), at least one hot air hood (36) is provided.
  32. Apparatus according to one of the preceding Claims 17 to 31,
    characterized in that
    in order to apply steam to the fibrous web (38), at least one steam blowing device (44) is provided, in particular a steam blower pipe or steam blower box.
  33. Apparatus according to Claim 32,
    characterized in that
    the steam blowing device (44) extends at least substantially over the entire width of the hot air hood (36), measured transversely with respect to the web running direction.
  34. Apparatus according to Claim 32 or 33,
    characterized in that
    the steam blowing device (44) is arranged at least partly within the hot air hood (36).
  35. Apparatus according to Claim 32 or 33,
    characterized in that
    viewed in the web running direction (L), the steam blowing device (44) is arranged directly before the hot air hood (36).
  36. Apparatus according to one of the preceding Claims 32 to 35,
    characterized in that
    the steam blowing device (44) comprises at least one steam blower pipe with openings, the diameter of which lies in the range from about 5 to about 1 mm and preferably in the range from about 4 to about 2.5 mm.
  37. Apparatus according to one of the preceding Claims 32 to 36,
    characterized in that
    in the area of the drying zone, the fibrous web is covered by at least one permeable belt (40), and in that the distance between the steam blowing device (44) and the outer permeable belt (40) covering the fibrous web is < 30 mm, in particular < 20 mm, in particular < 15 mm and preferably ≤ 10 mm.
  38. Apparatus according to one of the preceding Claims 32 to 37,
    characterized in that
    the steam blowing device (44) comprises at least one steam blower pipe with openings which are arranged at a mutual spacing of < 20 mm, in particular < 10 mm and preferably < 7.5 mm.
  39. Apparatus according to one of the preceding Claims 32 to 38,
    characterized in that
    the steam blowing device (44) comprises at least one steam blower box, and the transverse moisture profile of the fibrous web (38) can be adjusted and/or regulated via the said steam blower box.
  40. Apparatus according to one of the preceding Claims 32 to 39,
    characterized in that
    the steam blowing device (44) comprises at least one steam blower pipe, and the dryness of the fibrous web (38) can be influenced or adjusted and/or regulated, at least substantially, via the said steam blower pipe.
  41. Apparatus according to one of the preceding Claims 17 to 40,
    characterized in that
    in the area of the drying zone, the fibrous web (38) is covered by at least one permeable belt (40), and in that means such as in particular a doctor (46) are provided in order to lead away the air boundary layer carried along by the outer permeable belt (40) covering the fibrous web (38) before the belt enters the drying zone.
  42. Apparatus according to one of the preceding Claims 31 to 41,
    characterized in that
    the hot air for the hot air hood (36) is at least partly taken from the hood (66) assigned to a drying cylinder (60), in particular a Yankee cylinder.
  43. Apparatus according to Claim 42,
    characterized in that
    the hot air taken from the hood (66) of the drying cylinder (60) has a temperature of about 300°C.
  44. Apparatus according to one of the preceding Claims 31 to 43,
    characterized in that
    the hot air hood (36) is at least partly supplied with hot air, the temperature of which lies in a range < 250°C, in particular < 200°C and preferably in a range from about 150°C to about 200°C.
  45. Apparatus according to one of the preceding Claims 31 to 44,
    characterized in that
    in the area of the drying zone, on the side of the fibrous web (38) or of the additional dewatering belt that faces away from the hot air hood (36), there is arranged at least one evacuated device (32), in particular a suction box and/or suction roll.
  46. Apparatus according to Claim 45,
    characterized in that
    the evacuated device comprises a suction roll with a suction box defining a suction zone.
  47. Apparatus according to Claim 29 or 30,
    characterized in that
    the further permeable belt is formed by a press belt (80), which is under a high tension, preferably in a range from about 40 to about 60 kN/m, and, as a result, exerts a pressing pressure in a pressing zone, which preferably lies in a range from about 0.5 to about 1.5 bar.
  48. Apparatus according to Claim 47,
    characterized in that
    viewed in the web running direction (L), the length of the pressing zone formed by the permeable press belt (80) is at least substantially defined by the wrap area over which the press belt (80) wraps around the suction roll.
  49. Apparatus according to either of the preceding Claims 47 and 48,
    characterized in that
    viewed in the web running direction (L), the length of the pressing zone formed by the permeable press belt (80) corresponds at least substantially to the length of the suction zone of the suction roll.
  50. Apparatus according to one of Claims 47 to 49,
    characterized in that
    viewed in the web running direction (L), the drying zone is smaller than the pressing zone.
  51. Apparatus according to one of Claims 47 to 49,
    characterized in that
    viewed in the web running direction (L), the drying zone is equal to or longer than the pressing zone.
  52. Apparatus according to one of the preceding Claims 17 to 51,
    characterized in that
    the volume throughput (l/min) of the steam is lower than the volume throughput (l/min) of the hot air.
  53. Apparatus according to Claim 52,
    characterized in that
    at atmospheric pressure, the volume throughput of the steam is lower than 0.5 times, in particular lower than 0.3 times and preferably lower than 0.2 times, the volume throughput of the hot air.
  54. Apparatus according to one of the preceding Claims 17 to 53,
    characterized in that
    the temperature of the hot air applied to the fibrous web (38) is adjustable, in particular in order to influence the condensation of the steam in the fibrous web (38).
  55. Apparatus according to one of the preceding Claims 29 to 54,
    characterized in that
    in the drying zone, the fibrous web (38) is covered by a permeable press belt (80), which has a permeability > 170 m3/h (> 100 cfm), in particular > 510 m3/h (> 300 cfm), in particular > 850 m3/h (> 500 cfm), and preferably > 1189 m3/h (> 700 cfm).
  56. Apparatus according to one of the preceding Claims 17 to 55,
    characterized in that
    the fibrous web (38) is guided through the drying zone together with a permeable structured belt (40), which has a permeability > 170 m3/h (> 100 cfm), in particular > 510 m3/h (> 300 cfm), in particular > 850 m3/h (> 500 cfm), and preferably > 1189 m3/h (> 700 cfm).
  57. Apparatus according to one of the preceding Claims 29 to 56,
    characterized in that
    in the drying zone, the fibrous web (38) is covered by a permeable press belt (80) which at least substantially consists of synthetic material, in particular polyamide, polyethylene, polyurethane.
  58. Apparatus according to one of Claims 17 to 56,
    characterized in that
    in the drying zone, the fibrous web (38) is covered by a permeable press belt (80) which is formed by a metal belt.
  59. Apparatus according to one of the preceding Claims 17 to 58,
    characterized in that
    at least one belt (80, 40, 42) guided through the drying zone together with the fibrous web (38) is pre-heated before the drying zone in the web running direction (L).
  60. Apparatus according to Claim 59,
    characterized in that
    a steam heating device, an IR heating device and/or a hot water heating device is/are provided for the pre-heating.
  61. Apparatus according to Claim 59 or 60,
    characterized in that
    at least one inner belt (38) guided through the drying zone together with the fibrous web (38), such as in particular the additional dewatering belt, can be pre-heated by means of a hot water heating device.
  62. Machine (28) for producing a tissue web, having an apparatus according to one of the preceding Claims 17 - 61.
EP07857911.7A 2006-12-22 2007-12-20 Method and apparatus for drying a fibrous web Expired - Fee Related EP2122049B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200610062234 DE102006062234A1 (en) 2006-12-22 2006-12-22 Method and device for drying a fibrous web
PCT/EP2007/064290 WO2008077869A1 (en) 2006-12-22 2007-12-20 Method and apparatus for drying a fibrous web

Publications (2)

Publication Number Publication Date
EP2122049A1 EP2122049A1 (en) 2009-11-25
EP2122049B1 true EP2122049B1 (en) 2015-12-02

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US (1) US8435384B2 (en)
EP (1) EP2122049B1 (en)
CA (1) CA2673181A1 (en)
DE (1) DE102006062234A1 (en)
WO (1) WO2008077869A1 (en)

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WO2008077869A1 (en) 2008-07-03
CA2673181A1 (en) 2008-07-03
US20090283234A1 (en) 2009-11-19
US8435384B2 (en) 2013-05-07
EP2122049A1 (en) 2009-11-25
DE102006062234A1 (en) 2008-06-26

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