• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The subject of this invention is a process for producing a fibrous web (9), in particular for producing a tissue or tissue paper web, in which a pulp suspension to form a fibrous web (9) in a Doppelsiebformer (18) dewatered and the fibrous web (9) by means of a TAD dryer (19) is dried. After the twin-wire former (18) and before the TAD dryer (19), a pre-dewatering device (20) is provided, with a hood (17) and a suction roll (16), which is in each case exactly one covering (3, 4, 5). embedded fibrous web (9) flows through a hot fluid. The covering (5) between suction roll (16) and fibrous web (9) is a felt (5) and the covering (3, 4) between fibrous web (9) and hood (17) is a sieve (3, 4). In the pre-dewatering device (20), a volume flow of the fluid greater than 100 m3 / (m 2.min), in particular greater than 200 m3 / (m 2m.in), preferably greater than 250 m3 / (m 2m in) through the fibrous web (9 sucked through.
    公开号:AT517329A4
    申请号:T50843/2015
    申请日:2015-10-05
    公开日:2017-01-15
    发明作者:Dipl Ing Dr Anzel Andreas；Dipl Ing Scherb Thomas；Dipl Ing Mausser Wilhelm；Ing Gissing Klaus
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    METHOD FOR PRODUCING A FIBROUS WEB
    The subject of this invention is a process for producing a fibrous web, in particular for producing a tissue or tissue paper web. In this case, a pulp suspension is dehydrated to form a fibrous web in a twin-wire former and dried using a TAD dryer. In front of the TAD dryer a Vorentwässerungseinrichtung is provided with a hood and a suction roll, while the embedded between each exactly one fabric fiber web is traversed by a hot fluid, the fabric between the suction roll and fibrous web is a felt and wherein the fabric between fibrous web and Hood is a sieve.
    In conventional machines for the production of tissue with so-called Through Air Dryer (TAD), the fibrous web is first pre-dewatered with the aid of vacuum to a solids content of about 25% and then dried in the TAD dryer with the aid of large quantities of hot air. This air is heated by burners and with the help of blowers via the TAD hood through the fibrous web in the TAD drum passed, thereby evaporating the water in the fibrous web. The differential pressure between the hood and drum is low.
    By means of this through-flow drying, it is possible to produce particularly soft tissue.
    In the through-air drying with TAD drums, however, the air permeability of the fibrous web is a critical factor. If the fibrous web is too moist, the hot air can not penetrate the fibrous web. in the
    At the beginning of the TAD drum, only one impingement drying takes place, namely until the dry content of the fibrous web is high enough so that the air can flow through the fibrous web. Only then does one reach the area of throughflow drying. This undesirable impact drying in the TAD dryer has a detrimental effect on the moisture profile of the fibrous web. In addition, the drying efficiency or energy consumption decreases. To achieve a sufficient dry content often two TAD dryers are arranged one behind the other. EP 1 397 587 B1 discloses a tissue machine which dispenses with the use of TAD driers. Here, the fibrous web is pre-dried in a Vorentwässerungseinrichtung, while the fibrous web between a sieve and a felt is embedded and is thereby of hot air at a temperature <220 ° C, preferably <150 ° C and an air flow of less than 50 m / (m flows through). Subsequently, the transfer of the fibrous web takes place on a Yankee cylinder, where it is finally dried. A Yankee cylinder works only on the principle of impact drying.
    In contrast to EP 1 397 587 B1, the invention allows much higher machine speeds or
    Production capacity, as well as better paper quality - in terms of Caliper, bulk, water absorption capacity and softness. In one embodiment of the invention, the pre-dewatering device can also be operated without a special embossing belt, and furthermore permits the production of a fibrous web provided with a three-dimensional surface structure.
    The invention has for its object to increase the dry content of the fibrous web, so that the efficiency of the TAD drum is increased or the energy consumption is reduced. In addition, the moisture profile of the fibrous web is transverse to the machine direction compared to conventional TAD systems uniform and preferably the use of only one TAD drum should be possible.
    However, the pre-dewatering should take place so gently that the quality of the fibrous web is not diminished, a pre-dewatering with presses or press belts can excessively compress the fibrous web and thus adversely affect the quality.
    This object is achieved by a manufacturing method according to claim 1.
    According to the invention, in contrast to EP 1 397 587 B1, the process uses a TAD drum and additionally in the predrying device a very high volume flow of the fluid is greater than 100 m / (m min), in particular greater than 200 m / (m min), preferably greater than 250 m / (m min) sucked through the fibrous web.
    The differential pressure in the pre-dewatering device between hood side and suction roller side should be set to greater than 0.25 bar, in particular greater than 0.45 bar, preferably greater than 0.55 bar. As a result, the pre-dewatering device is operated at a pressure difference which is greater by orders of magnitude than the differential pressure in the TAD drum, which is generally 0.05 bar. Due to this large differential pressure in the
    Vorentwässerungseinrichtung can also be done there throughflow drying, at least partially.
    By this invention, the dry content prior to the TAD drum can be increased from previously about 25% in conventional machines to over 30%, in particular to over 35%, preferably even over 40%. As a result, the permeability of the fibrous web increases and in the TAD drum through-flow drying can take place over the entire looping area.
    The hot fluid may be, for example, hot air or hot steam. Favorable temperature ranges of the hot air are at temperatures of above 150 ° C, in particular above 200 ° C, preferably above 250 ° C.
    The pre-dewatering device can also be divided into several zones, for example into two zones, as viewed in the machine direction. This can be done in the first zone drying with other operating parameters, for example, with a higher pressure, a higher temperature or with another medium.
    It is advantageous if the felt has a fine-pored structure, wherein the average pore size of the fibrous web-facing surface of the felt is smaller than the average pore size of the suction roll facing side. A fine and soft felt top to the fibrous web increases the contact area between felt and fibrous web, which promotes Kapillarentwässerung. By contrast, a relatively thick felt structure towards the suction roll favors the removal of water through the perforated suction roll surface into the interior of the roll. The fineness of the finer felt surface should be less than 6.7 dtex, preferably less than 3.3 dtex, the layer directly below it should have a fineness of less than 17 dtex, preferably less than 11 dtex, whereas the opposite felt side facing the suction roll would then be much more open (coarser) should be to facilitate the removal of water through the holes of the suction roll. These values refer to the basic fiber content of the felt.
    In order to achieve the best possible contact between felt and fibrous web in the pre-dewatering device, it is favorable if, at the beginning of the pre-dewatering device, a contact roller is provided which presses gently against the suction roller, thereby improving the contact of the fibrous web with the felt. However, the fibrous web should not or only to a very small extent be pressed. The contact roller should therefore only have a line force of less than 30 kN / m, better less than 15 kN / m, preferably less than 10 kN / m.
    For the largest possible volume flow to be realized, the suction roll should have as large a free surface as possible, for example greater than 25%, but better still greater than 35%.
    It is favorable if a Yankee is provided after the TAD dryer.
    In the following two embodiments of the invention will be described with reference to drawings. Show it:
    Fig. 1 is a schematic (side view) tissue machine, which is suitable for carrying out the method according to the invention;
    FIG. 2 shows a further schematic (side view) of a suitable tissue machine; FIG.
    The same reference numerals in the two figures designate the same system parts.
    In Figure 1, the pulp suspension is placed in a twin-wire former 18 via a headbox 1 between two wires 3, passed over a forming roll 2 and dewatered by means of vacuum boxes (not shown) to a dry content of about 24%.
    The transfer box 11 then transfers the fibrous web 9 onto a structured TAD sieve 4. The structured TAD sieve 4 can (need not) be moved somewhat slower than the sieve 3, so that the fibers fit well into the depressions of the TAD Sieve 4 (wet crepe), through the suction box 10 for wet structuring, the fibers are sucked into the structure of the TAD sieve 4.
    This is followed by further drainage in the pre-dewatering device 20. Die
    Pre-dewatering device 20 has a hood 17, a felt 5 and a suction roll 16. The fibrous web 9 fixed on the TAD wire 4 can be pressed by the press roll (kiss press roll) 15 against the felt 5 and against the suction roll 16. This improves the contact between felt 5 and fibrous web 9. The line force in this press nip is between 5 kN / m and 30 kN / m. At these pressures, only about 20% of the fibers are compacted, the remaining 80% of the fibers are protected by the wells of the TAD sieve 4 and therefore are not compressed.
    The fibrous web 9 is passed between the felt 5 and the TAD sieve 4 through the pre-dewatering device 20. About the hood 17 in a first zone steam is blown onto the fibrous web 9 and that more than 0.3 tons of steam per ton of pulp, better still more than 0.5 tons of steam per ton of pulp, ideally even more than 1 ton of steam per ton pulp.
    In the second subsequent zone moist hot air at a temperature of about 150 ° C, preferably blown over 250 ° C through the fibrous web 9. The air humidity of the hot air supplied via the hood 17 should preferably be above 150 gH2o / kgLUft, in particular above 300 gH2o / kgAir, preferably even above 450 gH2o / kgLuft.
    Since the fibrous web 9 is still very moist in the area of the pre-dewatering device 20, hardly any evaporation processes occur here. Here, the viscosity of the water in the fibrous web 9 is rather reduced by the heat supply, whereby the water is sucked through the suction roller 16 from the fibrous web 9. The fine-pored felt 5 promotes drainage by capillary drainage. The amount of air supplied via the hood 17 substantially corresponds to the amount sucked off via the suction roller 16. The supplied air or
    Steam amounts according to the invention more than 100 m / '' (m min), in particular more than 200 m / 3 (m nfin), preferably even more than 250 m / (m min).
    The pressure in the hood 17 is above the ambient pressure, so that no cold ambient air is sucked in via the suction roller 16.
    Following the pre-dewatering device 20, the fibrous web 9 with a solids content of more than 30%, in particular more than 35% and preferably more than 40%, is transferred to the hot-air dryer 19. The hot air dryer 19 is a TAD dryer and consists of a TAD drum 13 and a TAD hood 14. At a dry content of 35%, a second TAD drum can be discarded.
    Subsequently, the fibrous web is transferred with a press roller 12 from the TAD sieve 4 to a Yankee cylinder 6. At Yankee cylinder 6, the fibrous web 9 is further dried with hot air supplied via the hood 7 and then scraped off. The Yankee surface is sprayed over a coater 8 with chemicals to more easily scrape the fibrous web from the Yankee surface.
    FIG. 2 shows a further device for carrying out the method according to the invention. In contrast to FIG. 1, here the pre-dewatering device 20 is not arranged within the structured TAD sieve 4, but already inside the sieve 3 of the twin-wire former 18. The transfer of the fibrous web 9 onto the structured TAD sieve 4 takes place only after the pre-dewatering device 20. The sieve 3 of the twin-wire former 18 can be a structured or an unstructured sieve.
    权利要求:
    Claims (12)
    [1]
    claims
    1. A process for producing a fibrous web (9), in particular for producing a tissue or tissue paper web, in which a pulp suspension to form a fibrous web (9) in a twin-wire former (18) is dewatered and the fibrous web (9) by means of a hot air dryer ( 19) is dried, wherein after the Doppelsiebformer (18) and before the hot air dryer (19) a Vorentwässerungseinrichtung (20) is provided with a hood (17) and a suction roll (16), while the between each exactly one covering (3 , 4, 5) embedded fiber web (9) by a hot fluid durchstrdmt, wherein the fabric (5) between the suction roll (16) and fibrous web (9) is a felt (5) and wherein the covering (3, 4) between fibrous web ( 9) and hood (17) is a sieve (3, 4), characterized in that the fibrous web (9) in the hot air dryer (19) on a structured TAD sieve (4) by means of a hot air TAD drum (13) sep is ocknet and that in the Vorentwässerungseinrichtung (20) a volume flow of the fluid greater than 100 m / (m min), in particular greater than 200 m / (m min), preferably greater than 250 m / (m min) is sucked through the fibrous web (9) ,
    [2]
    2. The method according to claim l, characterized in that the fibrous web (9) on a structured sieve (3, 4) through the pre-dewatering device (20) is guided.
    [3]
    3. The method according to claim 1 or 2, characterized in that on the sieve (3) of the Doppelsiebformers (18) formed fibrous web (9) on this same sieve (3) through the pre-dewatering device (20) is guided.
    [4]
    4. The method according to claim 1 or 3, characterized in that the fibrous web (9) on a structured or unstructured screen (3) in the twin-wire former (18) is formed.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the fibrous web (9) in the Vorentwässerungseinrichtung (20) of hot air at a temperature of about 150 ° C, in particular over 200 ° C, preferably flows through 250 ° C. becomes. 6. A method according to claim 5, characterized in that the fibrous web (9) is flowed through by moist hot air, wherein the moisture content is over 150 gH2o / kgAir, in particular more than 300 gtmo / kgnjft, preferably even more than 450 gimo / kgLuft.
    [7]
    7. The method according to any one of Anspriiche 1 to 6, characterized in that the fibrous web (9) in the Vorentwässerungseinrichtung (20) is flowed through by hot steam.
    [8]
    8. The method according to any one of Anspriiche 1 to 7, characterized in that the fibrous web (9) in the Vorentwässerungseinrichtung (20) successively passes through two zones, wherein the fibrous web (9) in the first zone preferably of steam and hot air and in the second zone is traversed by hot air.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the differential pressure in the Vorentwässerungseinrichtung (20) between the hood side and Saugwalzenseite is set to greater than 0.25 bar, in particular greater than 0.45 bar, preferably greater than 0.55.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the felt (5) has a fine-pored structure, wherein the average pore size of the fibrous web (9) facing surface of the felt (5) is smaller than the average pore size of to the suction roller (16) side facing.
    [11]
    11. The method according to any one of claims 1,2 or 4 to 10, characterized in that the Faserstof fbahn (9) on the TAD screen (4) through the pre-dewatering device (20) is guided.
    [12]
    12. The method according to any one of claims 1 to 11, characterized in that the fibrous web (9) after the flow-through drum (13) is fed to a Yankee (6).
    [13]
    13. The method according to any one of claims 1 to 12, characterized in that at the beginning of Vorentwässerungseinrichtung (20) a contact roller (15) is provided which presses against the suction roll (16), thereby characterized the fibrous web (9) against the felt ( 5) is pressed.
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    同族专利:
    公开号 | 公开日
    CN106968121A|2017-07-21|
    EP3359733A1|2018-08-15|
    EP3359733B1|2019-05-08|
    CN106968121B|2019-10-25|
    WO2017060049A1|2017-04-13|
    US9856603B2|2018-01-02|
    US20170096775A1|2017-04-06|
    AT517329B1|2017-01-15|
    ES2737828T3|2020-01-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0874083A1|1997-04-03|1998-10-28|Fort James Corporation|High-intensity through-air-drying for conversion of conventional wet-press paper machines|
    CA2804938A1|2004-01-30|2005-08-18|Voith Paper Patent Gmbh|Advanced dewatering system|
    WO2005075736A2|2004-01-30|2005-08-18|Voith Paper Patent Gmbh|Advanced dewatering system|
    DE69417068T2|1993-12-20|1999-08-05|Procter & Gamble|WET PRESSED PAPER AND METHOD FOR THE PRODUCTION THEREOF|
    US6398916B1|1999-12-16|2002-06-04|Valmet Karlstad Ab|Simplified through-air drying paper making machine having a twin wire forming section|
    DE10129613A1|2001-06-20|2003-01-02|Voith Paper Patent Gmbh|Method and device for producing a fibrous web provided with a three-dimensional surface structure|
    AT413039B|2004-01-13|2005-10-15|Andritz Ag Maschf|DEVICE FOR CHANGING A PAULING OF A PAPER MACHINE|
    AT508331B1|2009-05-19|2011-05-15|Andritz Ag Maschf|METHOD AND DEVICE FOR TREATING A FIBROUS CAR TRACK IN A LANGNIP PRESS UNIT|AT517330B1|2015-10-06|2017-01-15|Andritz Ag Maschf|METHOD FOR PRODUCING A FIBROUS WEB|
    US10694666B2|2018-04-16|2020-06-30|Baum Machine, Inc.|Harvesting machine having a moisture removal mechanism and a crop converging mechanism|
    WO2020005236A1|2018-06-27|2020-01-02|Kimberly-Clark Worldwide, Inc.|Through-air drying apparatus and methods of manufacture|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50843/2015A|AT517329B1|2015-10-05|2015-10-05|METHOD FOR PRODUCING A FIBROUS WEB|ATA50843/2015A| AT517329B1|2015-10-05|2015-10-05|METHOD FOR PRODUCING A FIBROUS WEB|
    PCT/EP2016/071621| WO2017060049A1|2015-10-05|2016-09-14|Method for producing a fibrous material web|
    EP16766279.0A| EP3359733B1|2015-10-05|2016-09-14|Method for producing a fibrous web|
    ES16766279T| ES2737828T3|2015-10-05|2016-09-14|Procedure for manufacturing a band of fibrous material|
    CN201610857571.6A| CN106968121B|2015-10-05|2016-09-27|Method for manufacturing fiber material web|
    US15/283,636| US9856603B2|2015-10-05|2016-10-03|Process for production of a fibrous pulp web|
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