DE102011083367A1 - Former for machine for manufacturing fibrous material web e.g. paper web, from fibrous material suspension, has lower wire, and felt enclosing suction roller and guided over conducting and adjustable rollers for adjusting felt strain - Google Patents

Abstract

The former (1) has a lower wire (3) for dewatering of a fibrous material web (2), and a wire suction roller (4) for guiding the web. A wire conducting roller (5) is arranged downstream of the wire. A pick-up-roller (6) is arranged between the suction and conducting rollers for removing the web and transferring the material web to a pressing section (7). A felt (8) is guided over the suction roller and provided for enclosing the suction roller in an enclosing area. The felt is guided over conducting rollers (9) and a horizontally adjustable roller (10) for adjusting felt strain. An independent claim is also included for a machine for manufacturing fibrous material web.

Description

The invention relates to a former for a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web from at least one pulp suspension, with at least one sieve for dewatering the fibrous web to be produced from at least one pulp suspension, with a sieve suction roll over which the on the in particular lower sieve resting and to be manufactured from at least one pulp suspension fibrous web is led, with one of the Siebsaugwalze in Sieblaufrichtung of the particular lower sieve downstream Siebleitwalze, over which the particular lower sieve is guided, and with a between the Siebsaugwalze and the Siebleitwalze and each other in particular the lower Siebs arranged, felted and vacuumed pick-up roll for the removal of the fibrous web to be produced from at least one pulp suspension and transfer thereof into a press section.

Such a former is part of a wire section for a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web of at least one pulp suspension and from the large number of publications known.

In the production of pulp, beech and spruce wood are used in a known manner. These are thinning and industrial lumber. These come mainly from sustainably managed forests.

The 1 shows a schematic representation of a part of the technology of pulp production. Shown are the drainage E (wet end), the drying T (dryer) and the packaging V (baler).

In a pulp mill, a pulp suspension is produced by various mechanical and chemical treatments of the pulp raw material. The pulp suspension is screened and diluted with water in a short cycle and then applied through a headbox to a dewatering device, such as a screening section, particularly a fourdrinier or a twin-wire machine. The dewatered pulp web is then pressed, dried and wound or cut into a final product.

And in the production of a fibrous web, the pulp is fed from a headbox to a wire of a wire section where it is then dewatered to a dry solids content of about 20%. The fibrous web to be made from the pulp is then further dewatered in a press section by passing it through one or more rollers which extract water by mechanical pressing of the fibrous web. In a subsequent dryer section, the fibrous web is then in contact with a plurality of drying cylinders. The dry content of the fibrous web is increased to a final value of 90 to 98%. The finished fibrous web, so paper, cardboard or cardboard, can be rolled up into a roll or cut into formats. Subsequently, known methods for further processing are available.

The 2 and 3 show now in schematic partial representation in each case a former 1 a known wire section for a machine 100 for producing a fibrous web 2 , in particular a paper, cardboard or packaging paper web of at least one pulp suspension. From a headbox, not shown, the at least one on a particular lower sieve 3 applied pulp suspension, optionally dehydrated in cooperation with a particular upper sieve when forming a Doppelsiebstrecke to a dry solids content of about 20%. The drainage is carried out in a known manner by the at least one particular lower sieve 3 ( 2 ) and if necessary by further different drainage elements 14 , such as Foilkasten, wet vacuum and vacuum cleaner ( 3 ). At the end of the shaper 1 becomes the pulp suspension to be produced from at least one pulp suspension 2 on the particular lower sieve 3 in the machine direction MD (arrow) in the direction of a press section, not shown 7 guided. After a sieve suction roll 4 becomes the particular lower sieve 3 via a wire guide roll 5 guided. The at least one pulp suspension to be produced fibrous web 2 gets on a pick-up roller 6 by means of negative pressure from the particular lower sieve 3 to a first upper felt of the press section, not shown 7 passed, so on the line between the sieve suction roller 4 and the wire guide roll 5 ,

It is therefore an object of the invention to further develop a former of the type mentioned above such that the fibrous web to be produced from at least one pulp suspension undergoes an additional drainage before it is transferred to a press section and a possible rewetting is markedly reduced. The further development of the former according to the invention is intended in particular in the production of selected varieties, such as, for example, WFC, WFU, Newsprint, cardboard and packaging.

This object is achieved according to the invention in a former of the type mentioned in the introduction by means of a felt via the wire suction roll is guided, which wraps around the sieve suction at least in the looped by the particular lower sieve Umschlingungsbereich, thereby causing additional dewatering and a reduction of remoistening to be produced from at least one pulp suspension fibrous web before the press section, and that the felt through a plurality of guide rollers and at least a preferably horizontally adjustable roller is guided for adjusting the felt tension.

The object of the invention is completely solved in this way.

The use according to the invention of a felt within the former, in particular within its forming zone, leads to an additional dewatering of the fibrous web to be produced from at least one fibrous stock suspension and to a reduction in its rewetting in front of a press section.

The dewatering performance of the machine for producing a fibrous web, in particular a paper, board or packaging paper web of at least one pulp suspension is thus increased significantly before the press section, ie already in the forming zone of the former. This increase in drainage performance, in turn, results in energy savings in the machine section wire section, press section and dryer section.

Furthermore, a cleaning before the first press of the press section by the additional and especially coarse felt, which can absorb a lot of dirt, obtained. As is known, felts are easier to clean in the former as they can be made coarser. And press felts in a single-NipcoFlex press ( EP 1 072 721 A2 - "Single NFP") can be made finer according to the invention, whereby a higher quality and a higher dry content can be achieved in the produced from at least one pulp suspension fibrous web. Moreover, a longer service life of the felts in the press section can be effected.

The felt is preferably stretched and preferably controlled so that it has a felt tension in the range of 2.5 to 5 kN / m, preferably 3 to 4.5 kN / m. These ranges ensure safe and efficient use of the felt.

Furthermore, preferably several preferably traversing high-pressure water jet nozzles are provided for conditioning the felt, wherein they have a nozzle diameter of ≥ 0.4 mm, preferably ≥ 0.8 mm, and / or a pressure of ≥ 10 bar, preferably of ≥ 12 bar. This ensures efficient conditioning of the felt.

The felt preferably comprises at least two layers and a woven or laid basic structure, wherein it in turn preferably comprises at least two build-up layers on the basic structure, preferably as a nonwoven. The uppermost and in particular the lower sieve partially contacting the build-up layer here preferably has at least 17 dtex, preferably at least 44 dtex. These ranges of values ensure sufficient strength of the contacting make coat.

The felt in its entirety preferably has an air permeability of ≥ 30 cfm, preferably 40 cfm. These ranges of values allow efficient removal of the water drained from the fibrous web to be produced from at least one pulp suspension.

Moreover, a device for lubricating the felt, for example by means of water, is preferably provided. As a result, premature felt wear is effectively and moreover inexpensively avoided, especially since the running time of the machine for producing a fibrous web, in particular a paper, board or packaging paper web from at least one pulp suspension is appreciably extended.

Furthermore, preferably in the direction of the direction of travel of the lower sieve, in particular preferably directly in front of the sieve roller, preferably several lower sieves together with overlying pulp webs to be produced from at least one pulp suspension, especially high-vacuum suction boxes whose negative pressure preferably increases in the direction of wire run of the particular lower sieve and / or whose negative pressure is in the range of 45 to 80 kPa, preferably 45 to 75 kPa, in particular 45 to 65 kPa. As a result, the drainage of the fibrous web to be produced from at least one pulp suspension is in turn improved.

After the wire guide in Sieblaufrichtung the particular lower screen after the wire suction roller arranged Siebleitwalze several elements, such as pipe suction, are preferably provided for further conditioning of the felt. This arrangement also serves to effectively prevent rewetting of the fibrous web produced from at least one pulp suspension within the wire section.

Of course, a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web from at least one pulp suspension may comprise at least one former according to the invention. It arise while the aforementioned advantages of the invention.

The sieve suction roll of the former is preferably a part of a Gautschpresse, in particular a preferably covered, in particular felted mini NFP, on the one hand for additional dewatering of the fibrous web to be produced from at least one pulp suspension and on the other hand for intercepting Sauglochmarkierungen in the produced from at least one pulp suspension fibrous web the sieve suction roller is used. The preferred covering of the mini-NFP allows drainage up and down within the wire section, so even before the press section. For widths of the press of ≤ 8 m (limit is then 200 kN / m), a cost-saving mini-NFP can be used. For press widths of ≥ 8, a "normal" NFP can be used to apply sufficiently high line loads.

And the Gautschpresse, in particular the preferably covered, in particular felted mini-NFP preferably has a line load of ≥ 40 kN / m, preferably of ≥ 60 kN / m, and / or a shoe length of ≥ 60 mm, preferably of ≥ 90 mm, in particular of ≥ 120 mm, on. These ranges of values give sufficiently good press values at acceptable acquisition and operating costs.

• – EP 1 072 721 A2 („Single NFP”);
• – EP 1 077 283 B1 („Tandem NFP”);
• – EP 1 048 780 B1 („Tandem NFP”);
• – EP 1 316 641 B1 („3. Presse”);
• – EP 1 749 926 B1 („DuoCentri”); und
• – DE 10 2004 003 674 A1 („DuoCentri plus 4. Presse”).

Also preferably has a press section preferably arranged in the machine direction immediately before a dryer section at least one press nip. A press having at least one press nip and felted on one side is disclosed, for example, in the following publications:

• - EP 1 072 721 A2 ("Single NFP");
• - EP 1 077 283 B1 ("Tandem NFP");
• - EP 1 048 780 B1 ("Tandem NFP");
• - EP 1 316 641 B1 ("3rd Press");
• - EP 1 749 926 B1 ( "DuoCentri"); and
• - DE 10 2004 003 674 A1 ("DuoCentri plus 4th Press").

The relevant content of these publications is hereby made the subject of the present description.

And the drying section itself is preferably formed single-row and preferably has a short first drying group with a maximum of three cylinders, preferably two cylinders, in particular a cylinder on. When using the former according to the invention such cost-effective press designs can be used.

Further features and advantages of the invention will become apparent from the following description of several preferred embodiments with reference to the drawings.

Show it

1 a schematic representation of a part of the technology of pulp production;

2 and 3 in each case a schematic partial representation of a former of a known wire section for a machine for producing a fibrous web; and

4 to 6 in each case a schematic partial representation of preferred embodiments of a former according to the invention of a known wire section for a machine for producing a fibrous web

The 4 to 6 each show schematic partial representations of preferred embodiments of a former according to the invention 1 for a machine, not shown 100 for producing a fibrous web 2 (dashed line) of at least one pulp suspension. In the produced fibrous web 2 in particular, it is a paper, board or packaging paper web.

The shaper 1 includes at least one sieve 3 for dewatering the fibrous web to be produced from at least one pulp suspension 2 , a sieve suction roll 4 over which the on the particular lower sieve 3 resting and to be produced from at least one pulp suspension fibrous web 2 is guided, and one of the suction sieve 4 in Sieblaufrichtung S (arrow) of the particular lower sieve 3 downstream screen guide roll 5 over which the particular lower sieve 3 is guided. Between the sieve suction roll 4 and the wire guide roll 5 and one another in particular of the lower sieve 3 is a felted and vacuumed pick-up roller 6 for the removal of the fibrous web to be produced from at least one pulp suspension 2 and transfer of the same in a press section, not shown 7 arranged.

It is now over the sieve suction roll 4 a felt 8th led, which the sieve suction roll 4 at least in that of the particular lower sieve 3 looped wrap area 4.u wraps around, thereby additional dewatering and a reduction in rewetting of the produced from at least one pulp suspension fibrous web 2 in front of the press section, not shown 7 to effect. Furthermore, the felt 8th over several guide rollers 9 and at least one preferably horizontally adjustable roller 10 for adjusting the felt tension 8.S guided. The preferably horizontal adjustability of the roller 10 is represented by a double arrow.

The use of the former shown 1 is particularly useful in the production of selected varieties such as WFC, WFU, Newsprint, carton and packaging.

Furthermore, the felt 8th so tense and preferably regulated that he felt a tension 8.S in the range of 2.5 to 5 kN / m, preferably 3 to 4.5 kN / m. Also, several are preferably traversing and merely indicated high pressure water jet nozzles 11 for conditioning the felt 8th provided, with a nozzle diameter 11.D of ≥ 0.4 mm, preferably ≥ 0.8 mm, and / or a pressure of ≥ 10 bar, preferably of ≥ 12 bar.

The felt 8th itself includes, as only in 5 indicated, at least two layers 8.L1 . 8.L2 and a woven or laid basic structure 8.g , Also, the felt can 8th at least two training levels 8.A on the basic structure 8.g , preferably as non-woven. Here, the top and the particular lower sieve 3 in some cases contacting structural layer 8.A at least 17 dtex, preferably at least 44 dtex. Also, the felt points 8th an air permeability 8.P of ≥ 30 cfm, preferably ≥ 40 cfm.

Moreover, preferably in the machine direction MD (arrow) immediately before a non-illustrated, the skilled person, however, known from a variety of publications dryer section 12 arranged press section 7 at least one press nip on. In addition, the dryer section 12 formed in a single row and has a short first drying group with a maximum of three cylinders, preferably two cylinders, in particular a cylinder on.

The two in the 5 and 6 illustrated preferred embodiments of the former according to the invention 1 for a machine, not shown 100 for producing a fibrous web 2 from at least one pulp suspension are each with a device 13 for lubrication of the felt 8th , For example, by means of water provided.

Furthermore, in each Sieblaufrichtung S (arrow) of the particular lower sieve 3 preferably immediately before the wire guide roll 5 several the particular lower sieve 3 together with the fibrous web to be produced and made from at least one pulp suspension 2 impinging drainage elements 14 , in particular high-vacuum suction boxes 14.1 arranged, their negative pressure 13.p in Sieblaufrichtung S (arrow) of the particular lower sieve 3 preferably increases and / or their negative pressure 13.p in the range of 45 to 80 kPa, preferably 45 to 75 kPa, in particular 45 to 65 kPa.

Also, according to the direction of sieve S (arrow) of the particular lower sieve 3 after the sieve suction roll 4 arranged Siebleitwalze 5 several elements 15 , for example, pipe sucker 15.1 , for further conditioning of the felt 8th intended.

The in the 6 illustrated preferred embodiment of the former according to the invention 1 for a machine, not shown 100 for producing a fibrous web 2 at least one pulp suspension comprises a sieve suction roll 4 , part of a rubber press 4.1 , in particular a preferably covered, in particular felted, mini-NFP.

This rubber press 4.1 , in particular the preferably covered, in particular felted mini NFP has a line load 4.1LL of ≥ 40 kN / m, preferably ≥ 60 kN / m, and / or a shoe length 4.1SL of ≥ 60 mm, preferably ≥ 90 mm, in particular ≥ 120 mm.

In summary, it should be noted that the invention further develops a former of the type mentioned at the outset so that the fibrous web to be produced from at least one pulp suspension undergoes additional dewatering before it is transferred to a press section and a possible rewetting is markedly reduced. The further development of the former according to the invention is particularly useful in selected varieties, such as WFC, WFU, Newsprint, cardboard and packaging.

LIST OF REFERENCE NUMBERS

1

 molder

2

 Fibrous web

3

 Scree; lower sieve

4

 Suction roll

4.u

 wrap region

4.1

 Gautschpresse

4.1LL

 line load

4.1SL

 Shoe length

5

 wire guide roll

6

 Pick-up roll

7

 press section

8th

 felt

8.A

 make coat

8.g

 basic structure

8.L1

 location

8.L2

 location

8.P

 Air permeability

8.S

 felt tension

9

 guide roll

10

 roller

11

 high pressure water jet

11.D

 Nozzle diameter

12

 drying section

13

 Device for lubricating the felt

13.p

 vacuum

14

 dewatering element

14.1

 High-vacuum suction box

15

 element

15.1

 Uhle

100

 Machine for producing a fibrous web from at least one pulp suspension

e

 Drainage (wet end)

MD

 Machine direction (arrow)

S

 Sieblaufrichtung (arrow)

T

 Drying (dryer)

V

 Packaging (baler)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1072721 A2 [0013, 0024]
• EP 1077283 B1 [0024]
• EP 1048780 B1 [0024]
• EP 1316641 B1 [0024]
• EP 1749926 B1 [0024]
• DE 102004003674 A1 [0024]

Claims (15)

Shaper ( 1 ) for a machine for producing a fibrous web ( 2 ), in particular a paper, cardboard or packaging paper web of at least one pulp suspension, with at least one sieve ( 3 ) for dewatering the fibrous web to be produced from at least one pulp suspension ( 2 ), with a suction sieve ( 4 ), over which the on the particular lower sieve ( 3 ) and to be produced from at least one pulp suspension fibrous web ( 2 ), with one of the suction sieve ( 4 ) in Sieblaufrichtung (S) of the particular lower sieve ( 3 ) downstream screen guide roll ( 5 ), over which the particular lower sieve ( 3 ) and with one between the sieve suction roll ( 4 ) and the wire guide roll ( 5 ) and one another of the particular lower sieve ( 3 ), felted and vacuumed pick-up roller ( 6 ) for the removal of the fibrous web to be produced from at least one pulp suspension ( 2 ) and transferring them into a press section ( 7 ), characterized in that via the suction sieve ( 4 ) a felt ( 8th ) which guides the suction sieve ( 4 ) at least in that of the particular lower sieve ( 3 ) looped area ( 4.u ), to thereby provide additional dewatering and a reduction in rewetting of the fibrous web to be produced from at least one fibrous stock suspension ( 2 ) in front of the press section ( 7 ) and that the felt ( 8th ) over several guide rollers ( 9 ) and at least one preferably horizontally adjustable roller ( 10 ) for adjusting the felt tension ( 8.S ) is guided. Shaper ( 1 ) according to claim 1, characterized in that the felt ( 8th ) is tensioned and preferably regulated such that it has a felt tension ( 8.S ) in the range of 2.5 to 5 kN / m, preferably 3 to 4.5 kN / m. Shaper ( 1 ) according to claim 1 or 2, characterized in that a plurality of preferably traversing high pressure water jet nozzles ( 11 ) for conditioning the felt ( 8th ) are provided, whereby they have a nozzle diameter ( 11.D ) of ≥ 0.4 mm, preferably ≥ 0.8 mm, and / or a pressure of ≥ 10 bar, preferably of ≥ 12 bar. Shaper ( 1 ) according to one of the preceding claims, characterized in that the felt ( 8th ) at least two layers ( 8.L1 . 8.L2 ) and a woven or laid basic structure ( 8.g ). Shaper ( 1 ) according to one of the preceding claims, characterized in that the felt ( 8th ) at least two building layers ( 8.A ) on the basic structure ( 8.g ), preferably as a nonwoven. Shaper ( 1 ) according to claim 5, characterized in that the uppermost and in particular the lower sieve ( 3 ) layer-by-layer contact-building layer ( 8.A ) has at least 17 dtex, preferably at least 44 dtex. Shaper ( 1 ) according to one of the preceding claims, characterized in that the felt ( 8th ) an air permeability ( 8.P ) of ≥30 cfm, preferably ≥40 cfm. Shaper ( 1 ) according to one of the preceding claims, characterized in that a device ( 13 ) for lubricating the felt ( 8th ), for example by means of water. Shaper ( 1 ) according to any one of the preceding claims, characterized in that in the direction of the filter (S) of the particular lower sieve (S) ( 3 ) preferably immediately before the wire guide roll ( 5 ) several the particular lower sieve ( 3 ) together with a fibrous web to be produced on at least one pulp suspension ( 2 ) dewatering elements ( 14 ), in particular high-vacuum suction boxes ( 14.1 ) are arranged, the negative pressure ( 13.p ) in Sieblaufrichtung (S) of the particular lower sieve ( 3 ) preferably rises and / or its negative pressure ( 13.p ) is in the range of 45 to 80 kPa, preferably 45 to 75 kPa, especially 45 to 65 kPa. Shaper ( 1 ) according to any one of the preceding claims, characterized in that after the in Sieblaufrichtung (S) of the particular lower sieve ( 3 ) after the sieve suction roll ( 4 ) arranged Siebleitwalze ( 5 ) several elements ( 15 ), for example, pipe sucker ( 15.1 ), for further conditioning of the felt ( 8th ) are provided. Machine for producing a fibrous web ( 2 ), in particular a paper, board or packaging paper web of at least one pulp suspension, characterized in that it comprises at least one former ( 1 ) according to one of the preceding claims. Machine according to claim 11, characterized in that the sieve suction roll ( 4 ) of the former ( 1 ) a part of a Gautschpresse ( 4.1 ), in particular a preferably covered, in particular felted, mini-NFP. Machine according to claim 12, characterized in that the Gautschpresse ( 4.1 ), in particular the preferably covered, in particular felted, mini-NFP a line load ( 4.1LL ) of ≥ 40 kN / m, preferably of ≥ 60 kN / m, and / or a shoe length ( 4.1SL ) of ≥ 60 mm, preferably ≥ 90 mm, in particular ≥ 120 mm. Machine according to claim 11, 12 or 13, characterized in that a preferably in the machine direction (MD) immediately before a dryer section ( 12 ) arranged press section ( 7 ) has at least one press nip. Machine according to claim 14, characterized in that the drying section ( 12 ) is formed in a single row and has a short first drying group with a maximum of three cylinders, preferably two cylinders, in particular a cylinder.

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