• 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:
    Pressing device for a machine for producing or treating a fibrous web comprising a press roll (1) and a counter roll (2) a first fabric (10) and a second fabric (20), which are arranged so that they run together through the press nip and a Web separation in the machine direction after the press nip takes place, also means by which the fibrous web at a transfer point (8) can be transferred to a subsequent treatment device and a transfer line (7) between the web separation and the transfer point (8) on which the fibrous web in operation is transported on the first stringing. The press device is characterized in that the transfer section (7) is straight or predominantly straight and the press device comprises at least one guide roller (3,4) for the first cover (10), wherein in the machine direction after web separation at least one guide roller (3, 4) for the first covering (10) as a driven guide roller (3) is executed.
    公开号:AT15442U1
    申请号:TGM50232/2015U
    申请日:2015-12-29
    公开日:2017-09-15
    发明作者:
    申请人:Voith Patent Gmbh；
    IPC主号:
    专利说明:

    description
    PRESS DEVICE
    The present invention relates to a press apparatus for a machine for producing or treating a fibrous web according to the preamble of claim 1.
    In modern paper machines for cardboard and packaging papers so-called tandem shoe presses are usually used at light to medium grammages in the range of 60 to 450 g / m2, in which the fibrous web is pressed successively into two shoe press nips. These two shoe presses are double felted. The fibrous web is thus guided in sandwich between two press felts through the shoe press nips.
    Regardless of the type of paper, a single, double-felted shoe press is used for low basis weight webs, from about 60 to 180 g / m 2.
    In order to ensure the web separation after a double-felted nip, the web is separated by a separating sucker from the top felt. Thereafter, the web runs on a transfer line, the installation possibility for additional facilities, such as. offers a steam box. After the transfer line, the web is removed from a take-off roll in the next group. This may be another press or dryer group.
    In the installations known from the prior art with double-felted nip and separating suction, the drive is located on the counter-roller to the shoe press.
    In these embodiments, however, it comes to web running problems after the separation sucker, especially when it comes to the first press nip. On the so-called transfer path between the separating sucker and the take-off roll can cause wrinkling and web edge getting up, which can lead to web breaks or folding the web edges in the further course of production.
    As a remedy for this web running problems, it is possible to reduce the production speed of the machine. However, this seriously affects the profitability of the production process.
    Another possible solution for improving the web run is the use of a central roller press. However, this is associated with higher costs for new plants and not feasible for existing facilities with shoe press devices for reasons of space.
    In DE 10 2011 082 159 A1 is also proposed to perform the web run in the transfer path wholly or predominantly curved. For this purpose, according to DE 10 2011 082 159 A1, both a convex separating suction device is used, as well as an additional, convexly executed stabilizing element. Since the covering here but over long distances on static elements is performed, on the one hand, a comparatively large drive power is necessary. On the other hand, the risk of accelerated felt wear is given.
    The object of the invention is therefore to propose a press device with at least one double-felted shoe press nip, which can ensure a stable web run in the transfer line even at high production speeds.
    The object is completely solved by a press device according to the characterizing part of claim 1.
    It is proposed a press device for a machine for producing or treating a fibrous web, in particular a paper, cardboard or pulp web. The press device comprises a press roll and a counter roll, which together form a press nip. In addition, the press device comprises a first clothing and a second clothing, each having a paper side and a running side and are arranged so that they run together through the press nip. The fabrics can each be a press felt, but it can also be in one or both of the
    Coverings to another suitable band, such as a transfer belt act. In operation, the fibrous web between the first and the second clothing is passed through the press nip. In each case, the paper side of the fabric touches the fibrous web.
    The two fabrics are performed in such a way that takes place in the machine direction after the press nip a web separation. In this case, the fibrous web is usually transported further with the first string during operation of the press apparatus. Since further process steps are necessary in the papermaking process after pressing, means are also provided in the press device with which the fibrous web can be transferred at a transfer point to a subsequent treatment device. This subsequent treatment device may be, for example, a further press or a drying device.
    Furthermore, the press device on a transfer path. In the context of this application, the term transfer path refers to the path of the first covering between the web separation and the transfer point into the subsequent treatment device. The term is explained by the fact that, during operation of the press device, the fibrous web is transferred to the subsequent treatment device on this route, ie. is transported. According to the invention it is provided that this transfer line is currently running. Alternatively, it may be at least predominantly straight. By this is to be understood that the transfer line is at least 50% of its length, in particular more than 65% of its length, more preferably more than 80% of its length just executed. This deviation from the completely straight web guide of the transfer path can be caused, for example, by the presence of a separating sucker, which is pressed against the first clothing with a certain force.
    In addition, at least one guide roller for the first fabric is provided in the press apparatus. However, in an advantageous embodiment of the invention, a plurality of guide rollers can also be provided, for both the first clothing and for the second clothing. This is particularly advantageous because both fabrics are usually designed as loops. According to the invention, it is provided that at least one guide roller of the first clothing is designed as a driven guide roller. This driven guide roll is provided in the machine direction after the web separation.
    In an advantageous embodiment of the invention, especially the first guide roller of the first fabric after web separation is provided as a driven guide roll. However, it may also be a different guide roller designed as a driven guide roller. Specifically, it may be advantageous to provide a plurality of driven guide rollers.
    The effect of these guide rollers can be seen in the fact that the first fabric, optionally together with the fibrous web after the press nip, especially after the web separation is not pushed as it were by the driven counter-roller of the press nip, but by the attached further back in the direction driven guide roller is at least partially pulled.
    Further advantageous embodiments of the invention are described in the subclaims.
    Thus, it can be provided in an advantageous embodiment of the invention that the press device comprises at least one separating sucker, which is provided on the running side of the first fabric. Such a vacuum cleaner sucks the first fabric, and optionally the fibrous web through the first fabric, and usually supports the fibrous web during operation of the press apparatus, so that it runs along with the first fabric and not with the second fabric. Typically, such a vacuum cleaner is operated with a vacuum between 5 kPa and 40 kPa, preferably between 10 kPa and 30 kPa, more preferably between 15 kPa and 25 kPa.
    Such a vacuum cleaner can be designed as a suctioned roller, as a so-called Saugfilzleitwalze.
    In many advantageous embodiments of the invention, however, the separating sucker will be designed as a static suction element. Often, such a vacuum cleaner is then executed in particular after the web separation with a straight or predominantly straight surface.
    Such a vacuum cleaner often leads to a slowing down of the first clothing during operation of the press device. This makes it particularly negative for the web run, if the first covering is possibly pushed together with the fibrous web exclusively by a driven roller. Therefore, in an advantageous embodiment of the invention, the driven guide roller is provided in the running direction of the first clothing after the separating sucker, and particularly preferably so that no further static elements, in particular no static suction on the first fabric more provided between the suction separator and the driven guide roll are. As a result, it can be ensured, for example, that the first clothing is not only pushed over the separating vacuum cleaner, but is also at least partially pulled by the driven guide roller.
    Experiments have shown that such an arrangement can have a positive effect on the web run during operation of the press device.
    In a preferred embodiment of the invention, the press roll is designed as a shoe press roll. The press shoes that are used here advantageously have a shoe length of more than 200 mm, in particular more than 250 mm.
    The press load in the nip is often more than 800 kN / m, preferably more than 1000 kN / m, more preferably more than 1100 kN / m.
    In a further advantageous embodiment, the first covering and / or the second covering is a press felt.
    In a further advantageous embodiment of the invention, the at least one separating suction is a static suction with a maximum of 10 suction slots, preferably with a maximum of 5 suction slots, more preferably with 3 suction slots. These are usually arranged one behind the other in the machine direction.
    A larger number of suction slots usually does not lead to improved separation efficiency of the separating sucker, but can cause an increased Bespannungsverschleiß or increased braking of the fabric and thus a higher drive power of the press device by itself.
    The length of the transfer path can influence the web travel behavior. Therefore, in a further advantageous embodiment of the invention, it is provided that the length of this transfer path is less than 2500 mm, preferably less than 2000 mm, particularly preferably less than 1500 mm.
    If the drive power of the driven guide roller chosen too large, so this may also have negative effects on the operation of the press device, the life of the first clothing, etc. in some cases. Therefore, it can be provided in a further preferred embodiment that the drive power of the driven guide roller is less than 40%, preferably less than 30%, more preferably less than 25% of the total drive power of the press device.
    Furthermore, it can be provided that at least the driven guide roller is designed to be pivotable or linearly movable. If the driven guide roller is provided, for example, just behind the transfer point, can be by moving the driven guide roller, the web transfer, for example, by changing the wrap of a Abnahmesaugwalze optimize.
    In the following treatment device may be in advantageous embodiments of the invention to another press device, in particular a press device according to one of the preceding claims or to a drying device such as a dryer section with steam-heated cylinders.
    Especially for packaging papers or cardboard, in particular for basis weights between 60 and 450 g / m2, a second press device will often follow a first press device. In other applications, for example in the production of special light fibrous webs between 60 g / m2 and 180 g / m2, a drying device can be provided directly after the press device.
    In a dryer section, the fibrous web is usually supported on a drying wire. When transferring from the press device according to the invention, the fibrous web is then transferred from the first covering to a drying wire. When transferring it to a subsequent press device, for example into a shoe press, the fibrous web can be transferred to a belt, for example to a press felt.
    In a further advantageous embodiment of the invention, the means for transferring the fibrous web to the subsequent treatment device may comprise a Abnahmesaugwalze, wherein the Abnahmesaugwalze comprises at least one suction zone, preferably at least two suction zones.
    In embodiments in which the subsequent treatment device is a pressing device, it can be advantageously provided that the vacuum in at least one suction zone of the intake suction roll is more than 30 kPa, preferably more than 40 kPa, particularly preferably more than 50 kPa ,
    In embodiments in which the subsequent treatment device is a drying device, it may be advantageously provided that the vacuum in at least one suction zone of the intake suction roll is more than 20 kPa, preferably more than 25 kPa, particularly preferably more than 30 kPa ,
    In the following the invention is explained in more detail with reference to schematic, not to scale figures.
    Figure 1 shows a schematic representation of a device according to the invention Pressenvorrich.
    The press nip is formed in the press apparatus shown in FIG. 1 by a press roll 1 and a counter roll 2. The press roll 1 is designed here as a shoe press roll 1. The press shoe used in this case can advantageously have a shoe length of more than 200 mm or even more than 250 mm.
    The first fabric 10 and the second fabric 20 are executed in the embodiment shown in Figure 1 as press felts. They run together through the press nip. In the embodiment shown here, the fibrous web is introduced into the press nip on the second fabric 20 after it has been taken over by a take-off roll 6a from a previously arranged in the machine direction sheet forming device, which is not shown in the figure.
    After the press nip a separating sucker 5 is arranged, which is arranged below, ie on the running side of the first fabric. This separating sucker 5 is pressurized during operation of the press device with Ünterdruck. It is an object of the separating sucker 5 to ensure that the fibrous web continues to run after the web has been separated with the first covering 10. This separating sucker is executed in Figure 1 in a design with three suction slots. According to the invention, however, more or fewer suction slots are possible. Advantageously, for example, be a version with 5 suction slots. In many applications, the number of suction slots will be less than 10. After the separating sucker 5, the fibrous web is transported on a transfer line 7 on the first fabric 10 on until it is transferred at the transfer point 8 by means of a Abnahmesaugwalze 6 to the subsequent treatment device.
    Especially for packaging papers or cardboard, in particular for basis weights between 60 and 450 g / m2, a second press device will often follow a first press device. This may for example be a second Schuhpressenvorrich device. This is often double felted. In this case, the fibrous web is transferred at the transfer point 8 to a press felt 30. The vacuum of the take-off suction roll in this case is usually more than 30 kPa, often more than 40 kPa or in some cases more than 50 kPa.
    In other applications, for example in the production of special light fibrous webs between 60 g / m2 and 180 g / m2, a drying device can be provided directly after the press device. In this case, the transfer of the fibrous web at the transfer point 8 takes place on a drying wire 30. The vacuum of the take-off suction roll in this case is usually more than 20 kPa, often more than 25 kPa or in some cases more than 30 kPa.
    For the leadership of the first fabric 10 a plurality of guide rollers 3,4 are provided. The guide rollers 3,4 can be designed to be pivotable or linearly movable. This can be advantageous in particular in the case of the guide roll 3 directly after the transfer point 8 in order to optimize the transfer of the fibrous web to the subsequent treatment device, especially the looping of the take-off suction roll 6. In the embodiment shown here according to the invention, the first guide roller 3 is provided after the separating sucker 5 with a drive. It is also possible to provide another guide roller 3,4 with a drive. Usually, at least one further, static suction element, for example a tube suction device, is provided in a press device such as that shown, for example, on the first stringing 10 as well. This suction element can be used to condition the fabric 10,20,30. In this case, it is advantageous to position a driven guide roller 3 so that no further static elements, in particular no static suction elements are provided in the machine direction between the suction separator and the driven guide roller.
    1 shows a press device in which the transfer path 7 between the web separation and the transfer point 8 according to the invention straight, or predominantly straight. On the known from the prior art convex or concave web guide can be dispensed with, and it is still achieved a stable web run. In particular, in the advantageous embodiment shown, further static elements between the separating sucker 5 and the driven guide roller 3 are dispensed with.
    A further stabilization of the web run can be achieved by the length of the transfer path 7 is kept relatively short. Advantageously, this length is less than 2500mm, preferably less than 2000mm, more preferably less than 1500mm. In addition, the strength of the drive 31, the driven guide roller 3 can support the stabilization of the web run. It may prove favorable that the drive power of the driven guide roll 3 is less than 40% of the total drive power of the press device, preferably less than 30%, more preferably less than 25%.
    权利要求:
    Claims (11)
    [1]
    claims
    1. Pressing device for a machine for producing or treating a fibrous web, in particular a paper, board or pulp web, comprising a press roll (1) and a counter roll (2), which together form a press nip, a first fabric (10) and a second fabric (20), each having a paper side and a running side and arranged so that they run together through the press nip and a web separation in the machine direction after the press nip takes place, in addition means by which the fibrous web at a transfer point (8) a subsequent treatment device can be handed over and a transfer line (7) between the web separation and the transfer point (8) on which the fibrous web is transported during operation on the first fabric, characterized in that the transfer line (7) is straight or predominantly straight running and the press device at least one guide roller (3,4) for the first Besp At least one guide roller (3,4) for the first clothing (10) is designed as a driven guide roller (3) in the machine direction after the web separation.
    [2]
    2. Press device according to claim 1, characterized in that the press device comprises at least one separating sucker (5), which is provided on the running side of the first fabric.
    [3]
    3. Press device according to claim 2, characterized in that the at least one separating sucker (5) is a static suction with a maximum of 10 suction slots, preferably with a maximum of 5 suction slots, more preferably with 3 suction slots.
    [4]
    4. Press device according to one of claims 2 or 3, characterized in that the driven guide roller (3) is provided in the running direction of the first clothing after the separating sucker (5), and between the separating sucker (5) and the driven guide roller (3) no further static elements, in particular no static suction on the first fabric more are provided.
    [5]
    5. Press device according to one of claims 1 to 4, characterized in that the press roll (1) is designed as a shoe press roll (1).
    [6]
    6. Press device according to claim 5, characterized in that the shoe press roll (1) comprises a press shoe with a shoe length of more than 200mm, in particular more than 250 mm.
    [7]
    7. Press device according to one of claims 1 to 6, characterized in that it is a press felt in the first fabric and / or the second fabric.
    [8]
    8. Press device according to one of claims 1 to 7, characterized in that the transfer path (7) between the web separation and the transfer point (8) in the subsequent treatment device less than 2500 mm, preferably less than 2000mm, more preferably less than 1500 mm ,
    [9]
    9. Press device according to one of claims 1 to 8, characterized in that the drive power of the driven guide roller (3) is less than 40%, preferably less than 30%, more preferably less than 25% of the total drive power of the press device.
    [10]
    10. Press device according to one of claims 1 to 9, characterized in that the driven guide roller (3) is designed to be pivotable or linearly movable.
    [11]
    11. Press device according to one of claims 1 to 10, characterized in that the subsequent treatment device is a further press device, in particular a press device according to one of the preceding claims or a drying device.
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    CN205839470U|2016-12-28|
    DE202016000260U1|2016-02-02|
    FI11211U1|2016-04-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4257844A|1977-04-15|1981-03-24|Beloit Corporation|Press section arrangement|
    EP0705937A1|1994-10-06|1996-04-10|Valmet Corporation|Press section with an equalizing press in a paper machine|
    EP1048780A2|1999-04-27|2000-11-02|Voith Sulzer Papiertechnik Patent GmbH|Press section|
    DE102007021879A1|2007-05-10|2008-11-13|Voith Patent Gmbh|Pressing arrangement for e.g. paper web producing machine, has transfer band for transferring fibrous web between pressing nips, where band is formed by transfer filter band with permeability in range of preset cubic feet per minute|
    DE102008054864A1|2008-12-18|2010-07-01|Voith Patent Gmbh|Pressing device has pressing arrangement forming pressing gap, through which material web is guided, where two coverings are so arranged and guided, that these form guiding area supporting material web|
    DE102011082159A1|2011-09-06|2013-03-07|Voith Patent Gmbh|Device for transferring and stabilizing a fibrous web|DE102018123389A1|2018-09-24|2020-02-13|Voith Patent Gmbh|Machine and method for producing a fibrous web|
    CN111235937A|2019-12-31|2020-06-05|华邦特西诺采新材料股份有限公司|Production process and equipment of decorative base paper by utilizing diagonal stabilizing technology|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015205476|2015-03-26|
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