EP2122049A1 - Method and apparatus for drying a fibrous web - Google Patents

Method and apparatus for drying a fibrous web

Info

Publication number
EP2122049A1
EP2122049A1 EP20070857911 EP07857911A EP2122049A1 EP 2122049 A1 EP2122049 A1 EP 2122049A1 EP 20070857911 EP20070857911 EP 20070857911 EP 07857911 A EP07857911 A EP 07857911A EP 2122049 A1 EP2122049 A1 EP 2122049A1
Authority
EP
European Patent Office
Prior art keywords
characterized
fibrous web
steam
web
drying zone
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
EP20070857911
Other languages
German (de)
French (fr)
Other versions
EP2122049B1 (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

Links

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

Abstract

In a method for drying a fibrous web, in particular a paper, paperboard or tissue web, in which method the running fibrous web is loaded with hot air in the region of a predefinable drying zone, the fibrous web is loaded with steam at least in regions within the drying zone. A corresponding drying apparatus is also described.

Description

Method and apparatus for drying a fibrous web

The invention relates to a method for drying a fibrous web, in particular paper, board or tissue web, in which the running fibrous web is subjected in the region of a predetermined drying zone with hot air. It further relates to a corresponding drying device, and a machine for producing a tissue web with such a drying apparatus.

In WO 2005/075737 A1 a method of the type mentioned has already been described, which is used to produce a bulky tissue web and in which a so-called belt press in combination with a hot air hood or steam hood for the dewatering of the fibrous web used as an alternative to a certain dry content becomes. In tissue machines, it is important to reduce energy consumption, especially during the drying process to achieve a predetermined dry content. On the other hand, there is a need to increase the dry content and low energy expenditure.

The invention has for its object to provide an improved method and an improved apparatus of the type mentioned, in which the drying process is preferably optimized for the initially mentioned method of producing a tissue web, in particular with regard to the energy requirement for the dewatering of the fibrous web.

As regards the method this object is achieved in that the fibrous web is at least partially acted on within the drying zone with steam. For drying the fibrous web, preferably tissue web, that hot air and steam is applied in combination with each other.

Advantageously, the fibrous web is viewed in the web running direction applied within the first half of the total length of the drying zone with steam.

in this case the fibrous web in the web running direction is preferably considered, at least at the beginning of the drying zone treated with steam.

The fibrous web can be viewed in the running direction first with steam and subsequently with hot air. However, according to an alternative expedient embodiment, it is also possible for the fibrous web in the running direction considered first with hot air, then apply with steam and then again with hot air.

In certain cases it is advantageous if the fibrous web as viewed in the web running direction over at least substantially the entire length of the drying zone is supplied with steam of time.

However, according to an alternative expedient embodiment of the method according to the invention it is also possible for the fibrous web in the web running direction, are at least substantially to apply only within the first half of the total length of the drying zone with steam, in which case the fibrous web in the web running direction, are preferably at least essen- sentlichen only the first half of the total length of the drying zone is treated with steam away.

According to a further advantageous embodiment, the fibrous web is viewed in the web running direction at least substantially applied only within the first third of the overall length of the drying zone, and preferably at least substantially about the first third of time with steam.

In certain cases it is also advantageous if the fibrous web is viewed in the web guiding device is at least substantially applied only within the first quarter of the total length of the drying zone, and in this case preferably at least substantially about the first quarter of time with steam.

According to another alternative embodiment of the inventive procedural proceedings, the fibrous web in the running direction is considered only at the beginning of the drying zone treated with steam.

The fibrous web is preferably applied over the specifiable drying section of time with hot air. At least in this case, the drying zone may be at least substantially defined by the area in which the fibrous web is acted upon with hot air. In this case, the fibrous web can be subjected to steam in particular, within and / or before the drying zone.

Suitably, the fibrous web is viewed in the web running direction at least partially simultaneously with hot air and steam applied. Under a simultaneous treatment is to be understood in each case, that a respective position of the fibrous web is acted upon both with hot air or with steam.

According to an expedient practical embodiment of the fibrous web, together with a permeable fabric, in particular structured belt or TAD belt (TAD = Through Air Drying) are led through the drying zone, whereby in this case, first, the fibrous web and then the permeab- Ie tape from the hot air or steam, to the extent this has not yet condensed in the web, are flowed through. The combined hot air and steam treatment of the invention can thus, for example, be applied to a TAD drying process.

A preferred alternative embodiment of the method according to the invention is characterized in that the fibrous web is guided together with at least one permeable fabric, in particular structured fabric through the drying zone and initially the permeable belt and subsequently the fibrous web from the hot air or steam flow through ,

Here, the fibrous web can be covered by at least one further permeable fabric, in particular a press belt in the drying zone advantageously, in this case, first the more permeable fabric or press belt, subsequently or first permeable belt or structured belt and finally the fibrous web from the hot air . the steam flows through. In this case resulting from the use of a press belt, a belt press type, in which is then applied in addition to the mechanical pressure in particular, the combined hot air and steam drying according to the invention.

Together with the fibrous web, in addition, a dewatering belt, in particular felt belt, are guided through the drying zone, whereby first the additional permeable belt or press belt, then through the first permeable belt or structured belt and the fibrous web and finally the additional dewatering belt of the hot air or steam flow through, so far as this, is not condensed on the train as mentioned above.

However, in principle it is also conceivable to subject the fibrous web in the drying zone at least partially an impingement flow drying. In this case, the combined hot air and how steam application the invention is used as part of such impingement drying. Basically, the fibrous web and a through air drying may be at least partially exposed, however.

The above-mentioned object is also achieved by an apparatus for drying a fibrous web, in particular paper, board or tissue web, having a drying zone, in the region of the moving fibrous web with hot air can be loaded, which device is characterized according to the fact that the fibrous web within the drying zone at least regionally with steam can be acted upon.

Preferred embodiments of the inventive apparatus are given in the subclaims.

It is to the treatment of the fibrous web with hot air preferably at least one hot air hood provided. In this case, the drying zone may in particular be defined by the dimensions of the hot air hood. A steam treatment of the fibrous web is conceivable advantageously within and / or particularly before the drying zone.

For acting on the fibrous web with steam is advantageously at least one steam blow, in particular steam blowgun or steam blow box is provided.

The steam blow extending expediently at least substantially over the entire measured transversely to the web running direction of width of the hot air hood.

Advantageous in particular also when the steam blow is at least partially disposed within the hot air hood. However, according to a preferred alternative embodiment, the steam blow may be disposed directly in front of the hot air hood also considered in the web running direction.

The steam blow concerned may also arranged so executed and / or controlled such that the fibrous web in the web running direction viewed only over a part of the total length of the drying zone or over the entire drying zone simultaneously with hot air as is acted upon with steam.

Includes steam blow a steam blowing tube, the diameter of the openings, this steam blowing tube is advantageously in a range of about 5 to about 1 mm, and preferably in a range from about 4 to about 2.5 mm. The diameter in question is preferably limited upwards, since a certain speed for the jet of steam is required.

If the fibrous web is covered in the region of the drying zone of at least one permeable fabric, such as a permeable press belt, so is the distance between the steam blow and the outer, the fibrous web covering permeable fabric, such as a press belt, preferably <30 mm, in particular <20 mm, in particular <15 mm and preferably <10 mm.

Includes steam blow a steam blowing tube, its openings can be advantageously used in a mutual spacing of <20 mm, in particular <10 mm, preferably <7.5 mm be disposed. Comprises the at least one steam blow steam blower box, then on this advantageously adjustable, the moisture transverse profile of the fibrous web and / or regulated.

Comprises the at least one steam blow steam blowing tube, so this steam blowing tube, the dry content of the fibrous web can be influenced or adjustable and / or regulatable at least substantially.

Basically, the steam blow may comprise either only at least one steam blower box or has at least one steam blow pipe, or both at least one steam or at least one steam blow pipe.

If the fibrous web is covered in the region of the drying zone of at least one permeable fabric, so are advantageously such as in particular a scraper or the like is provided to remove the covering with the outer fibrous web permeable belt entrained boundary layer of air before entry of the strip in the drying area.

The hot air for the hot air hood of the drying zone may be at least partially taken from a drying cylinder, in particular a Yankee cylinder, associated hood. Such energy recovery is possible, since the temperature of the exhaust of such an example, associated with a Yankee cylinder hood is much higher than the temperature required for the hot air to supply the hot air hood of the drying zone. Thus, the temperature of the hood of a drying cylinder, in particular a Yankee cylinder extracted hot air, for example, about 300 0 C. The hot air hood of the drying zone is preferably at least partially supplied with hot air whose temperature is in a range <250 0 C, in particular <200 0 C and preferably in a range of about 150 0 C to about 200 0 C.

The temperature of the hot air to supply the hot air hood can be correspondingly adjusted to optimize the operating point in terms of energy consumption and / or regulated. A higher temperature would usually bring no more efficient drying with it.

According to a preferred practical embodiment of the drying zone on the side remote from the hot air hood side of the fibrous web or of the additional drainage belt is an evacuated device, in particular suction box and / or suction roll disposed at least in the area.

In this case, a suction roll, the evacuated device in particular with a suction zone defining a suction box cover.

As already mentioned, is preferably formed by a further permeable band than under tension press belt a belt press. In this case, the press belt preferably is under a high voltage in a range of about 40 to about 60 kN / m, to thereby exert a pressing pressure in a pressing zone, which is preferably in a range from about 0.5 to about 1, 5 bar. It is particularly advantageous also when viewed in the web running direction length of the press zone formed by the permeable press belt 80 chen at least in the essential defined by the wrap area over which the pressure belt wraps around the suction roll.

The considered in the web running direction length of the press zone formed by the permeable press belt can in particular correspond to at least essentially the length of the suction zone or the suction box of the suction roll. The drying zone can be viewed in the web running direction is shorter than the press zone to be. In certain cases, however, it is also advantageous if the press zone in the running direction considered 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. The flow rate of the steam at atmospheric pressure can advantageously lower than 0.5 times, particularly less than 0.3 times and preferably less than 0.2 times the flow rate of the hot air to be.

The steam increases the temperature of the fiber web to reduce the viscosity of the water in the fibrous web. For this, the steam must in the fibrous web, in particular tissue web, condense, as this temperature increase in question is achieved. This increase in temperature can be set, for example, by an appropriate choice of the correct temperature level for the hot air.

thus the temperature of the fibrous web impinging hot air, in particular for influencing the condensation of the steam in the fibrous web is preferably adjustable.

If the temperature is too low, the steam condenses immediately before entering into the fibrous web. This is due to the fact that the steam is cooled by the housing of the hot air hood and the incoming colder bands. This can occur particularly in the case of using a so-called belt press, since the vapor must in this case penetrate first two outer bands, namely the outer permeable belt, in particular press belt, and optionally a permeable structured belt, before it enters the fibrous web. If the fibrous web in the drying zone by a permeable press belt covers, so has this advantageously has a permeability of> 100 cfm, in particular> 300 cfm, in particular> 500 cfm, and preferably> 700 cfm (cfm = cubic feet per minute).

If the fibrous web led together with a permeable structured belt through the drying zone, so this has preferably a permeability of> 100 cfm, in particular> 300 cfm, in particular> 500 cfm, and preferably> 700 cfm.

It is advantageous in particular if the fibrous web is covered in the drying zone by a permeable press belt, etc. which is sawn at least substantially made of plastic, in particular polyamide, polyethylene, polyurethane.

According to an alternative advantageous embodiment of the device according to the invention, the fibrous web in the drying zone may, however, also be covered by a permeable press belt, which is gebil- det by a metal band.

a run together with the fibrous web through the drying zone belt in the web running direction is preferably at least pre-heated before the drying zone. This is expedient in particular in the case that a consist of metal Hendes press belt is used.

For preheating a steam heater, an IR heater and / or a hot water heating device is advantageously used. A hot-water heating device is particularly useful for a run together with the fibrous web through the drying zone inner band such as in particular an additional dewatering belt.

As already mentioned, the entrained on the surface of the outer band air separation layer may conveniently be removed, for example by a in front of the hot air hood extending across the width thereof scraper. This also brings a correspondingly higher temperature with it after it is avoided that the steam is cooled before entry into the fibrous web. The temperature of the hot air can thus be selected to be lower.

The invention also relates to a machine for producing a tissue web, which is characterized in that it comprises a drying apparatus according to the invention.

The invention is illustrated hereinafter by means of embodiments with reference to the drawing; in which:

Fig. 1 is a schematic representation of a conventional, working only with steam drying apparatus and the corresponding dry matter content increase and the corresponding temperature curve,

Fig. 2 is a schematic representation of a conventional, working with hot air drying apparatus, and the corresponding dry matter content increase and the corresponding temperature curve,

Fig. 3 is a schematic illustration of an exemplary exemplary form of a machine according to the invention for the manufacture of a tissue web lung with an inventive drying apparatus and

Fig. 4 is a simplified schematic representation of a abgewan- punched embodiment of the drying apparatus according to the invention and the corresponding dry matter content increase and the corresponding temperature curve.

Fig. 1 shows a schematic representation of a conventional, working only with steam drying apparatus with a suction zone 10 having suction roll 12 and a suction zone 10 in the initial region opposite steam blower 14. The tissue web 16 is between an inner dewatering belt 18 or felt and a structured fabric 20 out together with an outer, here made of metal pressing belt over the suction roll 12th The tapes 18 to 20 are each permeable. The press belt 22 is guided over guide rolls 24 and presses the tapes 18 to 22 and the tissue web 16 in the area of ​​the suction zone 10 against the suction roll 12th

In the area of ​​steam, the temperature T rises. Subsequently, however, the tissue web 16 cools already within the suction zone 10 with the intake ambient air sharply. As is apparent from Fig. 1, there arises a dry content increased by about 0.2%, and indeed only in the region of the steam blower fourteenth

Fig. 2 shows a conventional, working with hot air drying apparatus in a schematic representation. This drying device comprises a suction zone 10 having suction roll 12 and a suction zone 10 opposed, extending over its whole, viewed in the web running direction L Length hot air hood 26. The tissue web 16 is back together between a permeable dewatering belt 18 or felt and a permeable structured fabric 20 conducted with an outer permeable press belt 22 of metal over the suction zone 10 of the suction roll 12th

The dry content increase D is in this drying device in which the tissue web is dried by the hot air flowing through these 16, about 1, 5%. The temperature T increases in the suction zone 10 and the hot air hood 26 only marginally.

Fig. 3 shows a schematic representation of an exemplary embodiment of a machine 28 according to the invention for producing a fibrous web, here for example a tissue web with an inventive drying apparatus 30.

The drying device 30 includes a suction roll 32 with a defined in particular by an integrated suction box and a suction zone 34 of the suction roll 32 associated hot air hood 36th

Here, the fibrous web 38, here for example, the tissue web is guided together with a permeable structured fabric 40 over the suction roll 32, wherein the fibrous web is 38 between the permeable structured belt and the suction roll 40 32nd In addition, externally wrapped within the range of the suction zone 34 a standing under high tension permeable press belt 80 around the suction roll 32, whereby a belt press is formed. This only reasonable in Fig. 1 indicated press belt 80 is again seen more clearly in FIG. 4. The hot air from the hot air hood 36 thus successively flows through the permeable press belt 80, the permeable structured fabric 40 and the fibrous web 38 and into the suction zone 34 of the suction roller 32. In addition, a dewatering belt 42, eg felt to be guided 32, the suction roll , located between the suction roll 32 and the permeable structured fabric 40 and through which the hot air flows through the suction zone 34 of the suction roll in the 32nd In the present exemplary embodiment, are one after the other flowed through the permeable press belt 80, the permeable structured fabric 40, fibrous web 38 and dewatering fabric 42 from the hot air.

The moving fibrous web 38 is thus acted upon by a drying zone away with hot air, said drying zone may be at least substantially determined by the hot air hood 36th In this case, this drying zone can be viewed in the web running direction L, for example at least substantially on the suction zone 34 of the suction roll 32 or for example also extend beyond.

the fibrous web 38 is then at least partially applied in the area of ​​this drying zone with hot air and steam according to the invention.

For this, the fibrous web 38 may be considered at least be applied at the beginning of the drying zone with steam in the running direction L. In the present embodiment shown in FIG. 3, the fibrous web 38 is viewed in the web running direction L treated with steam only at the beginning of this drying zone. Viewed in the web running direction first with steam and subsequently with hot air.

For treatment of the fibrous web 38 with a steam blow steam 44 such as in particular a steam blow pipe or steam blower box is provided at least. In the present case, this includes a steam blow 44 preferably provided at the beginning of the drying zone steam blowgun. The steam blow 44 can extend at least substantially over the entire measured transversely to the web running direction L width of the hot air hood 36th Advantageously, it is at least partially disposed within the hot air hood 36th

As can be seen, for example, with reference to FIG. 4, the steam blow 44 can for example also comprise at least one steam blower box. Also in this case, the steam blower box is arranged again at the beginning of the drying zone is at least substantially defined here by the hot air hood 36 and at least substantially within the hot air hood 36th Also in this case, the fibrous web 38 is thus initially then treated with steam and hot air.

As can be seen from Fig. 3, means may be about 46 or the like provided in particular a Scha- to the discharge to the outer fibrous web 38 overlying permeable structured belt 40 entrained air separation layer before entry of the strip 40 in the drying zone.

The machine 28 also comprises a former having two converging dewatering belts 40, 48, wherein the inner band simultaneously forms the permeable structured fabric 40 in this case. The two dewatering belts 40, 48 run together, forming a stock inlet gap 50 and are guided over a forming element 52 such as in particular a forming roll.

In the present case, the permeable structured belt 40 is thus formed by the coming into contact with the forming element 52 inner dewatering belt of the former. This does not come into contact with the forming element 52 outer dewatering belt 48 is again separated from the fibrous web 38 in connection to the forming element 52nd By means of a headbox 54 is introduced the pulp suspension in the stock inlet gap 50th

Between the forming element 52 and the drying device 30, a suction element 56 may be provided, through which the fibrous web 38 is supported on the permeable structured fabric 40 and pressed against it permeable structured belt 40th

Following the drying apparatus 30, the dewatering belt 42 is separated from the permeable structured fabric 40 again. In this case, after the drying apparatus 30, a pick-up or release element 58 is provided, through which the fibrous web is held at the separation from the dewatering belt 42 to the permeable structured fabric 40 38th

Subsequently, the fibrous web is guided together with the permeable structured fabric 40 formed by a preferably formed between a Yankee cylinder by a drying cylinder 60 and a pressing member 62 such as a press roll press nip 64 38th When the pressing member 62 is in this case, for example, a shoe press roll. Behind the press nip 64, the permeable structured belt 40 is again separated from the drying cylinder 60, while the fibrous web 38 remains on the drying cylinder 60th The drying cylinder 60 is assigned a hood 66th

Between the suction roll 32 and the drying cylinder 60, optionally, a vacuum box with a hot air hood 68 or the like may be provided to increase the sheet resistance.

The hot air for the suction roll 32 associated hot air hood 36 can supply at least partly of the drying cylinder 60 associated with cover 66 may be entnom- men. The hood 66 of this hot air taken having a temperature for example in the range of about 300 0 C, which is usually higher than the 36 required for the hot air of the hot air box te.

As can be seen in FIG. 3, assigned to the drying cylinder hood 66 may be hot air taken from the hot air hood are supplied to 36 via a supply line 70, can be arranged in the at least one valve 72, in particular control valve. In addition, a filter 74 for the removal of in particular short fibers, dust or the like can be provided in this supply line 70 if necessary. Finally, supply line 70, a fan may be disposed.

The cylinder 60 of the associated dome 66 removed hot air can also be mixed with a line 76 supplied cold air. Also in the line 76 for the supplied cold air at least one valve 78, in particular control valve can be provided again. About the mixing ratio of the hood 66 of removed hot air and the cold air therefore the temperature of the hot air hood can be adjusted 36 supplied air.

Fig. 4 shows, in simplified schematic representation of a modified embodiment of the inventive drying apparatus 30. As mentioned above, here comprising the steam blow 44 instead of a steam blowing tube an at least substantially arranged within the hot air hood 36 Steam blower. This steam box is viewed in the web running direction L again at the beginning of the drying zone is at least substantially defined here by the hot air hood 36 is provided.

The present embodiment differs from that of Fig. 3 also differs in is performed in addition to the permeable structured fabric 40 and the dewatering belt 42 or felt a permeable press belt 80 together with the fibrous web 38 through the drying zone, through the permeable structured fabric 40 , the fibrous web 38, and the permeable dewatering belt 42 are pressed in the area of ​​the suction zone 34 against the suction roll 32nd

The press belt 18 is viewed in the web running direction L in front of and behind out of the drying zone in each case by a guide roll 82, over which the voltage concerned to the press belt 80 is produced.

As can be seen in FIG. 4, a relatively high temperature T. results compared to the entire suction zone which defines the drying zone here simultaneously Accordingly, provides a relatively high dry content gain also here, for example about 3%, a.

LIST OF REFERENCE NUMERALS

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 evacuated device, suction roll

34 suction zone

36 hot air hood

38 fibrous web, in particular tissue web

40 permeable structured belt

42 dewatering belt

44 steam blow, steam blowing tube, steam blower

46. ​​Schaber

48 dewatering belt

50 stock inlet gap

52 forming element, forming roll

54 headbox

56 suction

58 Pickup or separating element

60 drying cylinders Yankee cylinder

62 press member

64 press nip 66 cover

68 hot air hood

70 supply line

72 valve

74 filter

76 line

78 valve

80 permeable press belt

82 guide roll

10

Claims

claims
1. A method for drying a fibrous web (38), in particular paper, board or tissue web, in which the moving fibrous web (38) is acted upon in the region of a predetermined drying zone with hot air, characterized in that the fibrous web (38) within the drying zone is at least partially acted upon by steam.
2. Device according to claim 1, characterized in that the fibrous web (38) in the web running direction (L) is applied considered within the first half of the total length of the drying zone with steam.
3. The method according to claim 2, characterized in that the fibrous web (38) in the web running direction (L) is considered at least applied at the beginning of the drying zone with steam.
4. The method according to any one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) are considered first with steam and then with hot air is applied.
5. The method according to any one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) are considered first with hot air, then with steam and is then acted upon again with hot air.
6. The method according to any one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially the entire length of the drying zone is supplied with steam of time.
7. A method according to any one of claims 1 to 5, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially within the first half of the total length of the
Drying zone is supplied with steam.
8. The method according to claim 7, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially over the first half of the total length of the drying zone is supplied with steam of time.
9. A method according to any one of claims 1 to 5, characterized in that the fibrous web (38) in the web running direction (L) is considered at least essentially applied only within the first third of the overall length of the drying zone with steam.
10. The method according to claim 9, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially over the first third of the total length of the drying zone away is acted upon with steam.
11. A method according to any one of claims 1 to 5, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially the only within the first quarter of the total length
Drying zone is supplied with steam.
12. The method according to claim 11, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially over the first quarter of the total length of the drying zone is supplied with steam of time.
13. The method according to any one of claims 1 to 5, characterized in that the fibrous web (38) in the web running direction (L) considered is applied only at the beginning of the drying zone with steam.
14. A method according to any one of the preceding claims, characterized in that the fibrous web (38) over the specifiable drying zone away is acted upon with hot air.
15. The method according to any one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) is considered at least partially simultaneously with hot air and steam is acted upon.
16. The method according to any one of the preceding claims, characterized in that the fibrous web (38) is led together with a permeable fabric, in particular structured belt or TAD belt, through the drying zone and initially the fibrous web, then through the permeable belt of the hot air or steam to flow through.
17. The method according to any one of claims 1 to 15, characterized in that the fibrous web (38) is guided together with at least one permeable fabric (40), in particular structured fabric through the drying zone and initially the permeable belt (40), and then the fibrous web (38) of the hot air or steam to flow through.
18. The method according to claim 17, characterized in that the fibrous web in the drying zone of at least a soft direct permeable fabric (80), in particular press belt is covered and initially the further permeable fabric (80) or press belt, then the first permeable belt (40) or band structure, and finally the fibrous web (38) flows through the hot air or steam.
19. The method of claim 17 or 18, characterized in that in addition, a dewatering belt (42), in particular felt belt is led through the drying zone together with the fibrous web (38) and initially, if necessary the further permeable fabric (80) or press belt , then the first permeable belt (40) and structured belt and the fibrous web (38) and eventually the additional dewatering belt (42) from the hot air or steam to flow through.
20. The method according to any one of the preceding claims, characterized in that the fibrous web (38) at least partially a impingement flow drying in the drying zone is exposed.
21. The method according to any one of the preceding claims, characterized in that the fibrous web (38) at least partially of a through air drying is exposed in the drying zone.
22. The device (30) for drying a fibrous web (38), in particular paper, board or tissue web, with a drying zone, in the region of the moving fibrous web (38) with hot air can be acted upon, in particular for implementing the method according to any one of the preceding claims characterized in that the fibrous web (38) within the drying zone, at least in areas acted upon with steam.
23. Device according to claim 22, characterized in that the fibrous web (38) in the web running direction (L) can be acted upon considered within the first half of the total length of the drying zone with steam.
24. Device according to claim 23, characterized in that the fibrous web (38) in the web running direction (L) viewed at least in the beginning of the drying zone with steam can be acted upon.
25. The device according to any one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) are considered first with steam, and then is acted upon with hot air.
26. The apparatus of claim 22 or 23, characterized in that the fibrous web (38) in the web running direction (L) are considered first with hot air, then with steam and then is acted upon with hot air again.
27. The device according to any one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) are considered substantially the entire length of the drying zone over at least away with steam acted upon.
28. Device according to one of claims 22 to 26, characterized in that the fibrous web (38) in the web running direction (L) considered is substantially at least acted upon only within the first half of the total length of the drying zone with steam.
29. Apparatus according to claim 28, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially over the first half of the total length of the drying zone away can be acted upon with steam.
30. Device according to one of claims 22 to 26, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially be acted upon only within the first third of the overall length of the drying zone with steam.
31. The device according to claim 30, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially over the first third of the total length of the drying zone away can be acted upon with steam.
32. Device 22 to 26, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially be subjected to one of the claims only within the first quarter of the total length of the drying zone with steam.
33. Apparatus according to claim 32, characterized in that the fibrous web (38) in the web running direction (L) viewed at least substantially over the first quarter of the total length of the drying zone is away acted upon with steam.
34. The device can be acted upon according to one of claims 22 to 26, characterized in that the fibrous web (38) in the web running direction (L) is considered only at the beginning of the drying zone with steam.
35. Device according to one of the preceding claims, characterized in that the fibrous web (38) over the specifiable drying zone away is acted upon with hot air.
36. Device according to one of the preceding claims, characterized in that the fibrous web (38) in the web running direction (L) considered is applied at least partially simultaneously with hot air and steam.
37. Device according to one of the preceding claims, characterized in that the fibrous web (38) is led together with a permeable fabric, in particular structured belt or TAD belt through the drying zone and initially the fibrous web, then through the permeable belt of the hot air or the steam flow through.
38. Device according to one of claims 22 to 34, characterized in that the fibrous web (38) is guided together with at least one permeable fabric (40), in particular structured fabric through the drying zone and initially the permeable belt (40), and then the fibrous web (38) of the hot air or steam to flow through.
39. Apparatus according to claim 38, characterized in that the fibrous web (38) in the drying zone by at least one further permeable fabric (80), in particular press belt is covered and initially the further permeable fabric (80) or press belt, then the first permeable belt (40) or band structure, and finally the fibrous web (38) flows through the hot air or steam.
40. The apparatus of claim 38 or 39, characterized in that together with the fibrous web (38) in addition, a dewatering belt (42), in particular felt belt is led through the drying zone and initially, if necessary the further permeable fabric (80) or press belt , then the first permeable belt (40) or structure and the band
Fibrous web (38) and finally the additional dewatering belt (42) from the hot air or steam to flow through.
41. Device according to one of the preceding claims, characterized in that at least one hot air hood (36) is provided for acting on the fibrous web (38) with hot air.
42. Device according to one of the preceding claims, characterized in that it is provided for acting on the fibrous web (38) with at least one steam blow steam (44), in particular steam blowgun or steam blow box.
43. Apparatus according to claim 42, characterized in that the steam blow (44) extends at least substantially over the entire measured transversely to the web running direction of width of the hot air hood (36).
44. The apparatus of claim 42 or 43, characterized in that the steam blow (44) is disposed at least partially within the hot air hood (36).
45. The apparatus of claim 42 or 43, characterized in that the steam blow (44) in the web running direction (L) viewed is arranged directly in front of the hot air hood (36).
46. ​​Device according to one of the preceding claims, characterized in that the steam blow (44) comprises at least one steam blow pipe having openings, whose diameter in a range from about 5 to about 1 mm, and preferably in a range from about 4 to about 2.5 mm.
47. Device according to one of the preceding claims, characterized in that the fiber web of at least one permeable fabric in the region of the drying zone (40) is covered and that the distance between the steam blow (44) and the outer fiber fabric web covering permeable fabric (38) is <30 mm, in particular <20 mm, in particular <15 mm and preferably <10 mm.
48. Device according to one of the preceding claims, characterized in that the steam blow (44) comprises at least one steam blow pipe having openings at a mutual distance of <20 mm, in particular <10 mm, preferably <7.5 mm are arranged.
49. Device according to one of the preceding claims, characterized in that the steam blow (44) comprises at least one steam and on this, the transverse moisture profile of the fibrous web (38) adjusted and / or regulated.
50. Device according to one of the preceding claims, characterized in that the steam blow (44) comprises at least one steam blow pipe and at least substantially over this steam blowing tube, the dry content of the fibrous web (38) can be influenced or adjusted and / or regulated.
51. Device according to one of the preceding claims, characterized in that the fibrous web (38) is covered in the region of the drying zone of at least one permeable fabric (40) and in that means such as in particular a scraper (46) or the like are provided with the outer fibrous web (38) covering the permeable belt (40) to dissipate entrained air boundary layer before entry of the strip in the drying zone.
52. Device according to one of the preceding claims, characterized in that the hot air for the hot air hood (36) at least partially of a drying cylinder (60), in particular a Yankee cylinder, associated hood (66) is removed.
53. Apparatus according to claim 52, characterized in that the hood (66) of the drying cylinder (60) hot air taken having a temperature of about 300 0 C.
54. Device according to one of the preceding claims, characterized in that the hot air hood (36) is at least partially supplied with hot air, the temperature in the range <250 0 C, in particular <200 0 C and preferably in a range of about 150 0 C. to about 200 0 C.
55. Device according to one of the preceding claims, characterized in that in the region of the drying zone to that of the hot air hood (36) side facing away from the fibrous web (38) or the additional dewatered serungsbandes at least one evacuated device (32), in particular
Suction box and / or suction roll, is arranged.
56. Device according to one of the preceding claims, characterized in that the evacuated device comprises a suction roll with a suction zone defining a suction box.
57. Apparatus according to claim 56, characterized in that the further permeable fabric by a press belt (80) is formed, preferably in a range of about 40 to about 60 kN / m is under a high voltage and thereby a pressing pressure in a pressing zone exerts, the bar is preferably in a range from about 0.5 to about 1.5.
58. Device according to one of the preceding claims, characterized in that in the web running direction (L) viewed length of the through the permeable press belt (80) pressing zone formed is at least substantially defined by the wrap area, via which the pressing belt (80) wraps around the suction roll ,
59. Device according to one of the preceding claims, characterized in that in the web running direction (L) viewed by the length of the permeable press belt (80) corresponds at least to press zone formed substantially to the length of the suction zone of the suction roll.
60. Device according to one of the claims, characterized in that the drying zone in the web running direction (L) is considered smaller than the pressing zone.
61. Device according to one of claims 22 to 59, characterized in that the drying zone in the web running direction (L) is considered equal to or longer than the pressing zone.
62. Device according to one of the preceding claims, characterized in that the flow rate (l / min) of the vapor is less than the flow rate (l / min) of the hot air.
63. Apparatus according to claim 62, characterized in that at atmospheric pressure, the flow rate of the steam is less than 0.5 times, particularly less than 0.3 times and preferably less than 0.2 times the flow rate of the hot air.
64. Device according to one of the preceding claims, characterized in that the temperature of the fibrous web (38) acting on hot air, in particular for influencing the condensation of the steam in the fibrous web (38) is adjustable.
65. Device according to one of the preceding claims, characterized in that the fibrous web (38) in the drying zone by a permeable press belt (80) is covered, the cfm a permeability of> 100, in particular> 300 cfm, in particular> 500 cfm, and preferably> 700 cfm has.
66. Device according to one of the preceding claims, characterized in that the fibrous web (38) together with a permeable structured belt (40) is guided through the drying zone, the cfm a permeability of> 100, in particular> 300 cfm, in particular> 500 cfm and preferably> 700 cfm has.
67. Device according to one of the preceding claims, characterized in that the fibrous web (38) permeable in the drying zone of a
is covered press belt (80) which consists at least essentially of plastic, in particular polyamide, polyethylene, polyurethane, etc..
68. Device according to one of claims 22 to 66, characterized in that the fibrous web (38) in the drying zone by a permeable press belt (80) is covered, which is formed by a metal band.
69. Device according to one of the preceding claims, characterized in that at least one, together with the fibrous web (38) led through the drying zone tape (80, 40, 42) in the web running direction (L) before the drying zone is preheated.
70. Apparatus according to claim 69, characterized in that a steam heater for preheating, an IR heater and / or a hot-water heating device is provided.
71. The apparatus of claim 69 or 70, characterized in that at least one, together with the fibrous web (38) led through the drying zone inner band (38) such as in particular the additional dewatering belt is preheated by a hot water heater.
72. Machine (28) for producing a tissue web having a drying device according to one of the preceding claims.
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)

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EP2122049A1 true EP2122049A1 (en) 2009-11-25
EP2122049B1 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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EP2122049B1 (en) 2015-12-02
DE102006062234A1 (en) 2008-06-26
CA2673181A1 (en) 2008-07-03
US20090283234A1 (en) 2009-11-19
WO2008077869A1 (en) 2008-07-03
US8435384B2 (en) 2013-05-07

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