• 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, wherein a pulp suspension to form a fibrous web (9) in a Crescentformer (10) dewatered and dried on a Yankee (6) becomes. After the crescent former (10), the fibrous web (9) is guided together with the forming fabric (3) and the felt (4) after the forming roll (2) via a suction roll (11). The subject of this invention is also an apparatus for carrying out the method according to the invention.
    公开号:AT517330A4
    申请号:T50853/2015
    申请日:2015-10-06
    公开日:2017-01-15
    发明作者:Dipl Ing Dr Anzel Andreas；Ing Gissing Klaus；Dipl Ing Scherb Thomas
    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 Crescentformer and dried using a Yankee. In Crescentformer the pulp suspension is introduced via a headbox between a forming fabric and a felt and dewatered centrifugally in the region of a forming roll. The subject of this invention is also a device with which the method according to the invention can be carried out.
    The production of high quality paper is traditionally done with TAD machines. These allow the production of very good product quality, but are very expensive to purchase and also the specific energy costs are far higher than in conventional dry-crepe machines that have a Yankee.
    In conventional tissue machines with crescent formers, i. with forming units where the
    Pulp suspension is introduced at a forming roller between a felt and a screen, the fibrous web is dewatered by the centrifugal forces occurring at the forming roller to about 10% dry content. Subsequently, the fibrous web is transported on the felt, dakuumentwässert to a dry content of about 20% to 23% vacuum and finally, after further dewatering of the wet felt by vacuum is no longer possible, mechanically pressed in a press section. The dry content increases to about 40%. Thereafter, the thermal drying takes place on the Yankee.
    The pressing of the fibrous web in a press section negatively affects the quality of the tissue web. By pressing the still wet paper web it loses bulk. However, the pressing is often necessary to achieve the required dry content before the web can be transferred to the Yankee.
    DE 10 2011 007 568 A1 describes a tissue machine in which the fibrous web is guided in front of the Yankee on a suction roll, which is wrapped by a permeable press belt. By the press belt, the fibrous web is less compressed than in conventional presses, but also occur thereby quality losses.
    The invention has for its object to provide a method for tissue production, can be produced in the highest possible tissue.
    This object is achieved by a manufacturing method according to claim 1.
    According to the invention, the fibrous web is guided together with the forming fabric and the felt immediately after the forming roll on a suction roll in the process and further dehydrated there.
    In the area of the suction roll, no press belt is arranged, but the fibrous web is enclosed only by the forming fabric and the felt, thus a gentle drainage can take place. The felt is located between suction roll and fibrous web and the forming wire wraps around the
    Fibrous web outside. Thus, a gentle pressure can be exerted on the fibrous web via the forming fabric, but in the region of the suction roll, the tensile stress of the forming fabric should be less than 15 kN / m, preferably less than 12 kN / m.
    The fibrous web should preferably be flowed through by a hot fluid at the suction roll, for example, hot air at a temperature of about 150 ° C, in particular over 200 ° C, preferably above 250 ° C.
    The air humidity of the hot air supplied via the hood should preferably be above 150 gH0 / kg air, in particular above 300 gH0 / kg air, preferably even above 450 gH0 / kg air. The supplied hot air should preferably be the exhaust air of the Yankee hood.
    It is advantageous if the felt, the fibrous web and the forming fabric in the initial region of the suction roll, ie in the region in which the fibrous web comes into contact with the suction roll, are flowed through by steam. As a result, the temperature of the fibrous web is further increased, the viscosity of the water decreases and the vacuum dewatering is improved. The suction roll or the suction roll hood can also be divided into several zones, for example into two zones, viewed in the machine direction.
    This can be done in the first zone, a drainage with other operating parameters, for example, with a higher pressure, a higher temperature or with another medium.
    Advantageously, the fibrous web is then transported on the felt to the Yankee where it is transferred to the Yankee surface via a press or preferably a shoe press. The entire machine then only needs two strings, the forming fabric and the felt.
    Compared with conventional machines, the dry content after the forming unit is not only 10%, but more than 20%, in particular more than 25%, preferably more than 30%. Between forming unit and Yankee there is still enough space available for further units. Thus, a further drying step may be carried out there, for example with an impingement dryer or with a radiation dryer (for example infrared radiator). The dry content is then greater than 25%, in particular greater than 30%, preferably greater than 35%.
    The advantage is that the fibrous web reaches the press at the Yankee with a dry content of more than 30%, instead of only 20% to 23% in conventional systems. With this higher dry content, the fibers are more resistant to mechanical pressing. This results in a gain in bulk after the press.
    It is favorable 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 side facing the suction roll. 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 coarser 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 is to facilitate the removal of water through the holes of the suction roll. These dtex values refer to the basic fiber content of the felt.
    The subject of this invention is also an apparatus for producing tissue according to claim 10.
    It is also conceivable that the forming fabric is lifted off the fibrous web after the forming roll, dried and then brought into contact again with the fibrous web in front of the suction roll.
    In the following, an embodiment of the invention will be described with reference to FIG.
    In FIG. 1, the pulp suspension is introduced in a crescent former 10 via a headbox 1 in the region of the forming roller 2 between a felt 4 and a forming fabric 3.
    The felt 4 and the forming fabric 3 wrap around a part of the outer periphery of the forming roll 2, thereby the water of the pulp suspension is thrown by centrifugal forces through the forming fabric 3 to the outside. The felt 4 is arranged on the inside. The fibrous web 9 after the forming roll 2 has a dry content of about 10%.
    Following this centrifugal dewatering, the felt 4, the fibrous web 9 and the forming fabric 3 are guided over a suction roll 11, which is looped in regions. The suction roller 11 sucks through the felt 4, the moisture from the fibrous web 9, it takes place here a vacuum dewatering.
    In order to improve the drainage, a steam blower box 12 is arranged in the initial wrap area of the suction roll 11, via which hot steam flows onto the fibrous web 9 and heats it. The fibrous web 9 after the suction roll 11 has a solids content of about 25% to 30%.
    Since the fibrous web 9 is still very moist in the area of the suction roll 11, evaporation processes hardly occur here. Here, rather, the viscosity of the water in the fibrous web 9 is reduced by the supply of heat, whereby the water is sucked through the suction roller 11 from the fibrous web 9. The fine-pored felt 4 promotes drainage by capillary drainage.
    After the suction roll 11, the forming fabric 3 is lifted off the fibrous web 9. This is followed by impact drying in the present example. Drying by means of radiation (for example infrared radiation) would also be conceivable.
    The impingement dryer 8 is arranged on the side of the fibrous web 9. The fibrous web then has a solids content of about 30% to 35%.
    Finally, the fibrous web 9 is transferred from the felt 4 to a Yankee 6 with the aid of a shoe press 5. At Yankee 6, the fibrous web 9 is dried in a known manner with hot air supplied via the Yankee hood 7 and scraped off at the end. The dry content of the fibrous web 9 in the transfer to the Yankee 6 is approximately 50%.
    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 Crescentformer (10) is dewatered and the fibrous web (9) by means of a Yankee ( 6) is dried, wherein in the Crescentformer (10) the pulp suspension via a headbox (1) between a forming fabric (3) and a felt (4) is introduced and dewatered Zentrifugai in the region of a forming roll (2), characterized in that the fibrous web (9) is guided together with the forming fabric (3) and the felt (4) via a suction roll (11) immediately after the forming roll (2).
    [2]
    2. The method according to claim l, characterized in that the fibrous web (9) wraps around the suction roll (11) regions and there is flowed through by a hot fluid.
    [3]
    3. The method according to claim 2, characterized in that the fibrous web (9) on the suction roll (11) is flowed through by hot air at a temperature of over 150 ° C, in particular over 200 ° C, preferably over 250 ° C.
    [4]
    4. The method according to claim 3, characterized in that the fibrous web (9) on the suction roll (11) is flowed through by moist hot air, the moisture content over 150 gH0 / kgAir, in particular over 300 gHCk / kgAir, preferably even over 450 gH0 / kgAir.
    [5]
    5. The method according to claim 3 or 4, characterized in that the supplied hot air is the exhaust air of a Yankee hood 7.
    [6]
    6. The method according to any one of claims 2 to 5, characterized in that the fibrous web (9) in the initial region of the suction roll (11) is flowed through by steam.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the fibrous web (9) on the felt (4) to the Yankee (6) is transported.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the fineness of the fibrous web facing felt surface is less than 6.7 dtex, preferably less 3.3 dtex, the layer directly below a fineness of less than 17 dtex, preferably less than 11 dtex and the fineness of the suction roll facing felt surface is greater than 17 dtex.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the fibrous web (9) before the Yankee (6) and after the suction roll (11) by a impingement dryer (8) is pre-dried.
    [10]
    Apparatus for making tissue comprising a crescent former (10) and a yankee (6), the crescent former (10) comprising a headbox (1), a forming roll (2), a felt (4) and a forming fabric (3) , wherein the felt (4) between Formierwalze (2) and fibrous web (9) is arranged, characterized in that immediately after the forming roller (2) a suction roll (11) is arranged, wherein the felt (4), the fibrous web (9 ) and the forming fabric (3) wraps around the suction roll (11).
    [11]
    11. The device according to claim io, characterized in that after the suction roll (11) and in front of the Yankee (6), a further thermal drying device (8), in particular a baffle dryer, is provided.
    [12]
    12. Device according to one of claims 10 or 11, characterized in that in the tissue machine except the felt (4) and the forming fabric (3) no further covering is provided.
    类似技术:
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    WO2003000002A1|2003-01-03|Method and device for producing a fibre strip provided with a three-dimensional surface structure
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    EP3623525A1|2020-03-18|Method and machine for manufacturing a sheet of fibrous material
    EP2633117B1|2014-04-30|Device and method for drying fibrous material
    AT522459B1|2020-11-15|DEVICE AND METHOD FOR MANUFACTURING A FIBER WEB
    DE102019127683A1|2021-02-25|Drainage device
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    同族专利:
    公开号 | 公开日
    EP3359734A1|2018-08-15|
    WO2017060053A1|2017-04-13|
    EP3359734B1|2019-05-08|
    CN106968120A|2017-07-21|
    CN106968120B|2020-05-19|
    US20190360155A1|2019-11-28|
    AT517330B1|2017-01-15|
    ES2740877T3|2020-02-06|
    US10808360B2|2020-10-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    DE10130038A1|2001-06-21|2003-01-02|Voith Paper Patent Gmbh|Method and machine for producing a fibrous web|
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    US6231723B1|1999-06-02|2001-05-15|Beloit Technologies, Inc|Papermaking machine for forming tissue employing an air press|
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    DE60130761T2|2000-06-30|2008-07-17|Kimberly-Clark Worldwide, Inc., Neenah|METHOD FOR PRODUCING TISSUE PAPER|
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    ITFI20070256A1|2007-11-12|2009-05-13|Costanza Panigada|PROCESS FOR CONTINUOUS PRODUCTION OF TISSUE PAPER AND DEVICE USED IN THIS PROCESS.|
    DE102011007568A1|2011-04-18|2012-10-18|Voith Patent Gmbh|Apparatus and method for producing a material web|
    AT517329B1|2015-10-05|2017-01-15|Andritz Ag Maschf|METHOD FOR PRODUCING A FIBROUS WEB|DE102018123389A1|2018-09-24|2020-02-13|Voith Patent Gmbh|Machine and method for producing a fibrous web|
    DE102019123811A1|2019-09-05|2021-03-11|Voith Patent Gmbh|Method and device for producing a fibrous web|
    SE544018C2|2020-01-09|2021-11-02|Valmet Oy|A tissue paper making machine|
    AT522459B1|2020-01-30|2020-11-15|Andritz Ag Maschf|DEVICE AND METHOD FOR MANUFACTURING A FIBER WEB|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50853/2015A|AT517330B1|2015-10-06|2015-10-06|METHOD FOR PRODUCING A FIBROUS WEB|ATA50853/2015A| AT517330B1|2015-10-06|2015-10-06|METHOD FOR PRODUCING A FIBROUS WEB|
    EP16766540.5A| EP3359734B1|2015-10-06|2016-09-15|Method and machine for producing a fibrous web|
    PCT/EP2016/071818| WO2017060053A1|2015-10-06|2016-09-15|Method for producing a fibrous material web|
    ES16766540T| ES2740877T3|2015-10-06|2016-09-15|Procedure and device for manufacturing a band of fibrous material|
    US15/764,593| US10808360B2|2015-10-06|2016-09-15|Method for producing a fibrous material web|
    CN201610855647.1A| CN106968120B|2015-10-06|2016-09-27|Method for producing a fibrous material web|
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