DE102007038133A1 - Fibrous material web e.g. paper web, producing device, has strip, which is bent upwards around guide roller, guided downwards by forming two drying passages and bent downwards relative to vertical - Google Patents

Abstract

The device (1) has a drying section provided with an impingement drying arrangement. A fibrous material web e.g. paper web, with a drying filter strip (17) is guided in the impingement drying arrangement along blowing covers (14, 15). The impingement drying arrangement is partially arranged in a machine base, and the drying filter strip of the impingement drying arrangement is guided upwards by a guide. The strip is bent upwards around a guide roller (19), guided downwards by forming two drying passages (12, 13) and is bent downwards relative to the vertical.

Description

The Invention relates to a device for producing a fibrous web, in particular a paper, board or tissue web, with a press device and one of these downstream drying apparatus comprising at least a first drying section with an impingement drying arrangement, in which the fibrous web with a drying wire along at least one, especially directed against this blast hood becomes.

Devices for producing a fibrous web, in particular paper or board web, with a press section and a downstream drying arrangement are known in a large number of designs from the prior art. Representative is here on the publication DE 10 2005 017 989 A1 directed. In this embodiment, the drying section comprises a first so-called impingement drying arrangement and a second of this downstream impingement drying arrangement, wherein the first impingement drying arrangement comprises a rotatable, in particular besaugbare, roller, the upper peripheral portion is wrapped in operation of the fibrous web and a above the roller and the Umschlingungsbereich opposite arranged first Blauenaube for applying the fibrous web with a drying medium, in particular in the form of hot air. In this embodiment, the removal of the fibrous web from the press section via a transfer belt to the first impingement drying arrangement takes place. The second impingement drying arrangement is constructed in such a way that it has at least one elongated vertical drying section, wherein it comprises at least one blast hood arranged laterally next to the drying section and directed towards the latter. By this arrangement, a high drying performance can be achieved and contamination of the dry assembly can be largely avoided. In particular, unwanted accumulation of scraps of paper in the drying section is excluded. These can fall directly down into the basement, for example, during demolition or during the transfer process. This solution builds very short in the axial direction, especially since the drying wire is guided in the impingement drying arrangement in the vertical direction from below back up, so that two dry sections considerable dry length can be realized in a very small space. The guidance of the fibrous web of the second impingement drying arrangement via a conventional contact drying, for example in the form of a single or multi-row drying cylinder assembly around which the fibrous web is meandering for the purpose of both sides uniform drying.

With the solution described in this document can be significantly higher dry content can be realized. Indeed builds the facility due to the two provided impingement arrangements very large in the longitudinal direction of the machine. Further is here appropriate space for the arrangement to take over to provide the fibrous web from the press section over a transfer belt is realized.

The Web guide is due to the two impingement drying arrangements relatively complex, in particular, a plurality of transfer points is provided, where the fibrous web that this supporting band replaced. Furthermore, retrofitting is already existing Machine concepts with such solutions only partially possible.

Of the Invention is therefore based on the object, a device for Production of a fibrous web, in particular paper, cardboard or tissue web of the type mentioned above, that on the one hand between the press section and one of these downstream Drying realized a simple web guide is, with the space for the drying device in optimal Way to be used. On the other hand, a retrofit de inventive solution without significant Expenditure also be possible in existing arrangements. Further are with the drying device high drying contents before the conventional Contact drying in a small space to achieve.

The inventive solution is characterized by the Characteristics of claim 1 characterized. Advantageous versions are described in the subclaims.

A Apparatus for producing a fibrous web, in particular a Paper, board or tissue web, with a press device and a this downstream drying device comprising at least one first drying section with an impingement drying arrangement, in which the fibrous web on a drying wire along a on the Trockensiebband, in particular the guided on this Fiber web directed glass hood is guided according to the invention, characterized in that the Impingement drying arrangement at least partially in the machine cellar is arranged and the dryer fabric of the impingement Tockenanordnung with the formation of two dry sections with respect to the vertical at an angle, d. H. inclined down and under guidance to a guide roller or pulley again inclined to is guided above. The vertical corresponds to a vertical opposite the machine floor.

The inventive solution allows for an arrangement of the impingement drying arrangement in the machine cellar providing installation space in the machine area above, provided for other building units can be. By the inclined guidance becomes the individual Drying section considerably extended, so here higher Dry contents can be achieved and the committee removal considerably easier at break-offs.

The Decrease of the fibrous web takes place either directly from the press section or via an intermediate transfer ribbon arrangement. The decrease and the transfer into the impingement drying arrangement takes place in a so-called acceptance area, preferably directly by means of the fibrous web in the impingement drying arrangement supporting drying wire belt. The acceptance range is from formed by a sieve belt entrained Siebsaugleitwalze, this in conjunction with a felt or the one Fibrous web leading aggregate, such as one Roller at least one surface or linear Allows contact. Preferably will help of the acceptance process, the drying wire in the acceptance area over a Siebsaugleitwalze out. This is the guide roller arranged offset in the vertical direction and in the axial direction, to allow an extended drying section here. Preferably, this drying section is flat without curvature executed, thereby reducing the effort in this arranged glass hoods and guide rollers can be kept low. Conceivable, however, are also versions with curved Drying section. In the former case preferably forms the Fibrous web leading drying fabric belt or at least one of the drying sections with a vertical, d. H. a vertical to the machine floor through the discharge line of the fibrous web in the acceptance area an angle of ≦ 70 °, preferably ≦ 60 °, most preferably ≦ 50 ° and / or a Angle ≥ 30 °, most preferably> 35 °.

curvatures the individual drying section can preferably by Radii <10 m, most preferably <8 m be characterized.

Both Dry sections of the impingement dryer assembly are V-shaped arranged to each other. The drying sieve in each of the drying sections is by an angle to a horizontal plane of> 25 °, particularly preferably> 30 ° writable. Preferably, the angle is ≤ 45 °.

to Realizing a simple construction, preferably the impingement drying arrangement is symmetrical built up. The plane of symmetry is through the guide roller, in particular the longitudinal axis of the deflection roller and a vertical to this described in the vertical direction. Also the guide roller is preferably designed as an evacuated roll to here to ensure stable guidance of the fibrous web.

In each of the drying sections is preferably at least one suction roller and at least one support or guide roller provided. The Back-up rollers advantageously serve to support the fibrous web or the sieve carrying it in the drying section, while the suction rolls take over the fibrous web support and promote drying. In every Drying line are preferably a plurality of backup rolls and / or Suction devices, in particular in the form of stationary suction boxes or suction rolls arranged. The back-up rolls can be grooved, drilled and / or vacuumed in an advantageous manner, whereby the web guide and drying intensity on can be improved.

Also The suction devices have a support function. Further these promote the dry performance. Depending on the arrangement, vacuum this also the space between the rollers. This will be a negative pressure on the glass case opposite side of the fibrous web generated.

In the inventive arrangement are the guide roller and the take-off roll each formed as a suction roll. That's it spanned sieve belt forms advantageously a V-shaped Arrangement of two drying sections, which pass through one after the other can be. The transfer of the fibrous web between the press arrangement and the drying device takes place preferably by means of an evacuated roll in the form of a so-called Pickup roller.

The Hoods used in the individual drying sections can over considered the width of the fibrous web and the machine width from a module or preferably from a plurality of individual controllable Modules exist, with the width of the individual modules in the range between about 1.5 to about 4 m, preferably about 2 to about 3 m. to Simplification of handling, these can be the same Operated operation. Preferably, the extend individual glass hoods over a large part of the guide area of the screen belt between the pick-up area and the deflection area or the acceptance area and the transfer area, where This results in very high dry effects.

Hot air is preferably used as the drying medium. In this case, temperatures between about 300 ° to 500 ° have been particularly advantageous proven. The blowing speed of the drying medium is in the range of about 70 to 130 m / s.

The the impingement drying arrangement downstream drying arrangement preferably comprises a contact drying, for example in the form of a single row or multi-row drying cylinder arrangement. The handover takes place on a drying cylinder. Due to the almost complete Arrangement of impingement drying arrangement in the basement can by suitable guidance of the fibrous web is a part of the downstream Drying device in the now not required space the impingement drying arrangement in the longitudinal direction of the machine be integrated above the machine floor, these in vertical Direction over each other at least partially overlapping can be arranged. This can be a particularly compact Drying device can be provided in the machine direction a minimum of space required. This is through the return the dryer fabric after the V-arrangement opposite to the machine direction of passage ensured by forming a transfer area.

The solution according to the invention is hereinafter explained with reference to figures. In detail is the following shown:

1 illustrates in a schematic simplified representation with reference to a section of the longitudinal view of a machine for the production of fibrous webs an inventively executed arrangement of an impingement drying arrangement;

2 clarifies a detail view according to 1 ;

3 illustrates a particularly advantageous development of an embodiment according to 1 ,

The 1 illustrates in schematic simplified representation of a section of a cross-sectional view of a machine 1 for producing a fibrous web, in particular paper, board or tissue web. Visible here is a acceptance area 2 between a press device 3 or a press section and one of these downstream drying device 4 which is also called a dryer section. The fibrous web F is at the end of the press section on a circulating endless belt 5 guided, which may be formed depending on the design and design of the press section as felt, support belt or transfer belt. In the case shown, the tape 5 formed for example by a felt belt. The drying device 4 includes a first drying section 6 and a second, the first drying section 6 in fibrous web passage direction, that is, in the machine direction L, downstream drying section 7 , The second dry section 7 is formed by a conventional dry arrangement. Their function is based on the principle of contact drying. This is designed in the illustrated case as a single-row dry arrangement. The fibrous web F is by means of a circulating endless belt 8th , which is preferably in the form of a so-called dryer, alternately guided along the surfaces of the drying cylinder TZ1, which are arranged here in the upper row. Visible here is that the acceptance area 2 between press device 3 and drying device 4 as well as the conventional drying arrangement in the second drying section 7 relative to the machine floor or the foundation 9 the machine 1 for the production of fibrous webs at a certain height h are arranged opposite to this. Between the press device 3 and the second drying section 7 is the first dry section 6 arranged. According to the invention, this comprises an impingement drying arrangement 10 , This is in a space-saving manner as the first dry section 6 between the press section and the press device 3 and the conventional drying arrangement in the form of the contact drying section. The arrangement of the impingement drying arrangement 10 takes place in such a way that they are essentially in an oblique direction up to the area of the machine cellar 11 that is below the foundation 9 extends. This is indicated by the impingement drying arrangement 10 two drying tracks 12 and 13 on, which are passed through successively and which are arranged at an angle β to each other in a space-saving manner. Preferably, the arrangement of the two drying sections takes place 12 and 13 V-shaped, that is, both are arranged at an angle β to each other, preferably the angle β is between the two trained drying sections 12 . 13 in the range between 40 ° to 120 °, more preferably 50 ° to 90 °, most preferably in the range of about 60 °. Referring to the foundation 9 closes each of the dry sections 12 . 13 an angle α1, α2 with this viewed in the direction of passage in the range of 25 ° to <90 °, more preferably between 30 ° and 80 °, most preferably> 60 °, wherein the angles α1, α2 can be the same size or different , Each of the drying sections 12 and 13 comprises at least one laterally arranged next to this and directed to this glass hood 14 respectively. 15 , In this case, the fibrous web F along a support band 16 , in particular a drying wire 17 along the two glass hoods 14 and 15 guided. The decrease of the fibrous web F of the press device 3 , in particular press section, takes place here over the drying wire 17 in the acceptance area 2 , In addition, the drying wire wraps around 17 preferably in the acceptance area 2 a so-called suction roll 18 , Which with a transfer ribbon 5 the press device 3 cooperates and the fibrous web F decreases. The decrease takes place in the area of the machine height above the foundation 9 , The acceptance area 2 describes a flat area or area with at least line contact. If you put one horizontal line through the last point, the two are dry sections 12 . 13 each directed against each other at an angle α1, α2 of preferably ≥ 30 ° to this aligned, preferably at an angle ≥ 60 °. This makes it possible to effectively achieve longer drying distances in a space-saving manner and furthermore to ensure a safe web guide. The drying arrangement, in particular the impingement drying arrangement 10 , Further comprises a deflection roller 19 for guiding and deflecting the dryer fabric 17 , The leadership of the dryer 17 takes place after acceptance of the fibrous web F of the press section V-shaped mainly in the area of the machine cellar 11 ie downwards in vertical direction. By the V-shaped guide, the fibrous web F is guided along an inclined plane passing through the guide of the dryer fabric belt 17 is writable. As a result, an optimally long drying section can be created even at low basement heights.

The individual glass hoods 14 . 15 preferably extend over most of the length of the dry sections 12 . 13 , At the leading of the fibrous web F side of the dryer fabric belt 17 opposite side, that is inside 20 , For supporting suction and support or guide rollers can be arranged, these are here with 21 and 22 designated and preferably alternately arranged at regular intervals.

Between the first upper suction roll 18 and the guide roller 19 or the deflection roller 19 and in the transition to the second dry section 7 by means of another guide roller 24 Preferably, a plurality of support rollers or guide rollers 22 and / or suction rolls 21 or suction boxes stationary type can be arranged. These backup rolls 22 support the fibrous web F or the dryer fabric carrying them 17 , These can be grooved, drilled and / or vacuumed, whereby the drying properties can be further improved.

Furthermore, the suction devices are also used 21 , Especially in the form of suction rolls, suction blow boxes or suction boxes, the support of the dryer fabric 17 or the fibrous web F, improve the web guide and promote the drying performance. These also absorb the space between the individual rollers 18 . 21 . 24 . 19 ,

The outlet of the blowing air is preferably carried out almost perpendicular to the surface 23 of the dryer fabric belt 17 , on which also the fibrous web lies. The single glass dome 14 respectively. 15 can consist of several partial hoods or have different sections. Storage is also in the basement. Preferably, the entire device is arranged such that it is mainly in the basement 11 the machine 1 extends.

The glass hoods 14 . 15 can be designed so that they can be lifted or swung, for example, during the transfer of the fibrous web F or for maintenance. Furthermore, in all variants in the hoods 14 . 15 Integrated burners and recirculation fans and bypass flaps to allow an integrated hot air system. Viewed across the machine width, ie transverse to the machine direction, the individual hoods 14 . 15 each consist of several individual modules in order to profile. These may be formed, for example, with a standardized width of about 1.5 to about 4 m, preferably 2 to 3 m. In this case, the individual modules can preferably be operated the same or else controlled in accordance with different drying capacities.

The acceptance area 2 is preferably arranged in the region of the machine base. This offers the advantage that the decrease remains easily accessible and the entire non-contact drying in the form of impingement drying arrangement 10 is arranged substantially below the machine base and extends in the basement. Seen in the longitudinal direction in the machine direction thereby space is gained.

In the case shown, the individual drying sections 12 . 13 preferably in each case straight running, that is, the drying area is considered flat in the running direction and describes a flat area. It is also conceivable embodiment not shown here with appropriate guidance of the dryer 17 with curved guide in the direction of travel.

The dryer 17 is advantageously up to the next drying cylinder TZ1 for transfer in the transfer area 25 on the outer circumference 26 a heated drying cylinder TZ1 out.

The solution according to the invention 1 illustrates a particularly advantageous embodiment, in which only the impingement drying arrangement 10 arranged in V-shape in the region of the cellar and the decrease of the fibrous web F from the press section directly by means of the dryer 17 he follows. This can be done on white Tere transfer belts, support bands, etc. are omitted. Specifically, here a direct simple fibrous web guide is guaranteed, with the V-shape even at low vertical basement heights long dry sections can be realized.

The 2 clarified by a section according to 1 the alternate arrangement of guide rollers and stabilization boxes on the inside 20 of the dryer 17 , The arrangement preferably takes place between guide or support rollers and the stabilization device 21 always alternately and at regular intervals. This creates the same conditions over the entire drying section.

Also the reversing roller 19 is preferably designed as a suction roll. The individual glass hoods 14 . 15 are operated with hot air.

Because of the already quite high dry content of the fibrous web F after passing through the impingement drying arrangement 10 and the associated relatively high strength of the web, this can be performed to limit the effort in at least one subsequent to the impingement drying arrangement contact drying section via heated drying cylinder TZ.

The 3 illustrates an advantageous development of an embodiment according to 1 , In this, the arrangement of the impingement drying arrangement takes place 10 downstream contact drying device or the drying section 7 viewed in the machine direction overlapping by part of the dry section 7 viewed in the longitudinal direction in the region of the extension of the impingement drying arrangement 10 , but is arranged in the vertical direction above this. The contact drying device of the drying section 7 can be performed in various ways. In the case shown this is single-row. The extension in the vertical direction takes place between the machine floor or foundation 9 and preferably within the height of the vertical extension of the dryer section upstream press section 3 , This may be the impingement drying arrangement 10 In addition, in addition, either include another impingement drying section with glass dome that adhere to the drying section 13 connects or only a transfer or transfer area 27 which, viewed in the machine direction, extends counter to the passage direction. In the case shown, the transfer area 27 through the leadership of the dryer 17 formed with, on its inside of suction devices 21 and support or guide rollers 22 is supported. The dryer 17 will do this on the back-up roll 24 deflected again against the machine direction, wherein the support roller 24 preferably in the area of the machine floor 9 is arranged. The transfer of the fibrous web F takes place from the transfer area 27 Here is an example of a single-row dry module 28 , the machine direction more dry assemblies, here for example 29 , comprising at least one drying cylinder TZ2 can be arranged downstream. The first dry assembly 28 is arranged here by way of example in a plane a, the second subordinate is arranged offset to this in the vertical direction in the plane b. The planes a and b are characterized by the position of the longitudinal axes of the drying cylinders of the individual dry modules 28 . 29 writable.

The formation of the impingement dry arrangement 10 , especially the dry sections 12 . 13 is preferably as in the 1 Therefore, with regard to the orientation and angle specifications on the statements in 1 can be referenced.

It is of decisive importance for the solution according to the invention that the fibrous web F on the one hand directly by means of the dryer 18 is taken from the press section and immediately the impingement drying arrangement 10 is supplied. The guide is thereby inclined downwards, that is, at an angle to the vertical, which is laid through the removal region, preferably in the range of ≥ 60 ° and <90 °. The return preferably takes place in the same way, so that a preferably symmetrical drying arrangement for the impingement drying arrangement 10 can be created.

1

contraption for producing a fibrous web

2

pick-up area

3

Press apparatus press section

4

dryer

5

Tape, Support band, transfer band

6

first drying section

7

second drying section

8th

dryer

9

foundation

10

Impingement drying arrangement

11

basement, cellar

12

first drying section

13

second drying section

14

Blashaube

15

Blashaube

16

support band

17

dryer

18

Suction roll

19

deflecting

20

inside

21

suction

22

supporting roll or guide roller

23

surface

24

supporting roll

25

Transfer area

26

outer periphery

27

Threading area

28

dryer assembly

29

dryer assembly

F

Fibrous web

β

angle

α1, α2

angle

L

machine direction

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102005017989 A1 [0002]

Claims (23)

Contraption ( 1 ) for producing a fibrous web (F), in particular paper, board or tissue web, with a press device ( 3 ) and one of these downstream drying device ( 4 ) comprising at least a first drying section ( 6 ) with an impingement drying arrangement ( 10 ), in which the fibrous web (F) with a dryer fabric belt ( 17 ) along at least one blast hood ( 14 . 15 ), characterized in that the impingement drying arrangement ( 10 ) at least partially in the machine cellar ( 11 ) and the drying wire belt ( 17 ) of the impingement cam assembly ( 10 ) with formation of two drying sections ( 12 . 13 ) with respect to the vertical inclined downwards and under the leadership of a pulley ( 19 ) is guided back upwards inclined. Contraption ( 1 ) according to claim 1, characterized in that within the dryer fabric belt ( 17 ) a take-off suction roll ( 18 ) provided with an element of the press device ( 3 ) an acceptance area ( 2 ) and the Abnahmesaugwalze ( 18 ) in the axial and vertical directions offset to the guide roller ( 19 ) is arranged. Contraption ( 1 ) according to one of claims 1 or 2, characterized in that the drying sections ( 12 . 13 ) V-shaped at an angle β between 40 ° to 120 °, preferably between 50 ° to 90 °, more preferably in the range of about 60 ° to each other. Contraption ( 1 ) according to one of claims 1 to 3, characterized in that the drying sections ( 12 . 13 ) are arranged at an angle β> 60 °, preferably> 65 ° to each other. Contraption ( 1 ) according to one of claims 1 to 4, characterized in that at least one of the drying sections ( 12 . 13 ) relative to a vertical to the machine floor ( 9 ) is oriented at an angle of ≦ 70 °, preferably ≦ 60 °, most preferably ≦ 50 °. Contraption ( 1 ) according to one of claims 1 to 5, characterized in that at least one drying section ( 12 . 13 ) an angle of> 30 ° with respect to a vertical to the machine floor ( 9 ), preferably> 35 °. Contraption ( 1 ) according to one of claims 1 to 6, characterized in that all drying sections ( 12 . 13 ) an angle of> 30 ° with respect to a vertical to the machine floor ( 9 ), preferably> 35 °. Contraption ( 1 ) according to one of claims 1 to 7, characterized in that at least one of the drying sections ( 12 . 13 ) with a horizontal plane an angle (α1, α2) viewed in the direction of passage in the range of 25 ° to 70 °, more preferably between 30 ° and 60 °, very particularly preferably between 30 ° and 45 °. Contraption ( 1 ) according to one of claims 1 to 8, characterized in that at least one of the drying sections ( 12 . 13 ) with a horizontal plane an angle (α1, α2) viewed in the direction of passage in the range> 60 °, preferably> 65 °. Contraption ( 1 ) according to one of claims 1 to 9, characterized in that the two drying sections ( 12 . 13 ) symmetrical with respect to a plane through the longitudinal axis of the guide roller ( 19 ) and a perpendicular to this are arranged. Contraption ( 1 ) according to one of claims 1 to 10, characterized in that the decrease in the acceptance area ( 2 ) of an endlessly circulating belt of the press device ( 3 ) he follows. Contraption ( 1 ) according to one of claims 1 to 11, characterized in that the decrease in the acceptance area ( 2 ) of an endlessly circulating band in the form of a transfer belt ( 5 ) he follows. Contraption ( 1 ) according to one of claims 1 to 12, characterized in that the removal area ( 2 ) between the drying wire ( 17 ) and the surface of a rotating element of the press device ( 3 ), in particular a press roll is formed. Contraption ( 1 ) according to one of claims 1 to 13, characterized in that in each drying section ( 12 . 13 ) at least one blast hood ( 14 . 15 ), which comprises a glass device for a dry medium, hot air being used as the dry medium. Contraption ( 1 ) according to one of claims 1 to 14, characterized in that the individual blast hood ( 15 ) viewed over the machine width consists of at least two individually controllable modules. Contraption ( 1 ) according to one of claims 1 to 15, characterized in that on the fibrous web (F) leading side ( 23 ) of the dryer fabric belt ( 17 ) opposite side ( 20 ) a plurality of back-up rolls ( 22 ) and / or suction devices ( 21 ) are arranged. Contraption ( 1 ) according to claim 16, characterized in that the support rollers ( 22 ) and / or suction devices ( 21 ) are arranged alternately. Contraption ( 1 ) according to claim 16 or 17, characterized in that the support rollers ( 22 ) and / or suction devices ( 21 ) are arranged at a uniform distance from each other. Contraption ( 1 ) according to one of claims 1 to 18, characterized in that the first and / or second drying section ( 12 . 13 ) of the impingement drying arrangement ( 10 ) are writable by a flat surface area. Contraption ( 1 ) according to one of claims 1 to 18, characterized in that the first and / or second drying section ( 12 . 13 ) of the impingement drying arrangement ( 10 ) are writable by a flat surface area. Contraption ( 1 ) according to claim 20, characterized in that the curvature is <10 m, preferably 8 m. Contraption ( 1 ) according to one of claims 1 to 21, characterized in that the impingement drying arrangement ( 10 ) is arranged downstream of a contact drying device, comprising at least one drying cylinder (TZ1, TZ2). Contraption ( 1 ) according to claim 22, characterized in that the contact drying device above the impingement drying arrangement ( 10 ) and in the machine direction at least partially within the extension range of the impingement drying arrangement ( 10 ) is arranged in the machine direction.