• 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 invention relates to a device and a method for transferring a strip (1) of a web (2) from a first covering (14) to a second covering (13). It is characterized in that the strip (1) is guided in a first region (9) between the first covering (14) and the second covering (13) and the transfer of the strip (1) to the second covering (13) he follows. This enables automatic web transfer, with significantly reduced space requirements and less equipment complexity.
    公开号:AT521367A4
    申请号:T50358/2019
    申请日:2019-04-18
    公开日:2020-01-15
    发明作者:Theussl André；Klamminger Wolfgang；Diemat Reinhard
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    Summary
    The invention relates to an apparatus and a method for transferring a
    Strip (1) of a web (2) from a first covering (14) to a second covering (13). It is characterized in that the strip (1) is guided in a first region (9) between the first covering (14) and the second covering (13) and the transfer of the strip (1) to the second covering (13) he follows. This enables automatic web transfer, with significantly reduced space requirements and less equipment complexity.
    Fig. 2
    1/24
    2694 AT
    DEVICE AND METHOD FOR CONVERTING A STRIP
    A TRAIN
    The invention relates to a method for transferring a strip of a web from a first covering to a second covering of a machine for producing a fibrous web. The invention also relates to an apparatus for transferring a strip of a web in a machine for producing a fibrous web with a first covering and a second covering, and with a first region for transferring the strip from the first covering to the second covering, in the first region the strip is guided between the first covering and the second covering.
    In general, the web is guided in a machine for producing a fibrous web on different fabrics in order to achieve a desired effect. With regard to the transfer of the train, a distinction can be made between an open and a closed train. A closed train is characterized by the fact that the web is supported by a covering, e.g. a felt, a sieve, a belt or the like is led directly to the next covering. In accordance with the continuous support and guidance of the web by the covering, the closed train is particularly effective and in particular unproblematic when the machine is started up, i.e. when the web is to be run through the machine for the first time. The same problem as when starting up can also be seen when re-transferring after a web break. In the case of an open train between two coverings, on the other hand, the web must overcome an open area between the coverings without being supported by a covering. Accordingly, the start-up or transfer is problematic since the web has to overcome the open area between the coverings without support and without guidance.
    Machines for pulp drying process a fibrous web that consists mainly of pulp and typically has a sheet weight of more than 450 g / m 2 in the production plant. The transition of the web from a first covering, for example the pick-up felt, a press unit, for example a combination press, to a second covering, for example the felt of a shoe press unit, is generally as
    2.24
    2694 AT open train executed. When the machine is started up or transferred again, the web must be manually transferred from the first covering to the second covering in the open area. To do this, a strip is usually cut from the web in the machine direction, e.g. by a fluid cutting jet directed against the web, which separates the web into a strip and into a remaining web. This strip is manually transferred by one person to the subsequent fabric, i.e. the strip is guided manually within the machine. Since manipulation inside the machine in the area of incoming roll nips is a danger to life and limb, technical solutions are required to avoid these risks. The machine typically runs at a speed of 50-200 m / min. After successfully transferring the strip, the strip is spread out, i.e. the width of the strip cut from the web is increasingly increased, e.g. by moving the fluid cutting jet in the cross-machine direction, as a result of which the strip covers the entire web at the end of the spreading process and thus the entire web is transferred after the strip has been transferred.
    It should be noted that the strength of a cellulose web increases with increasing dry content. The pulp web typically has a dry content of <20% before mechanical press dewatering, a dry content of typically <60% after mechanical press dewatering, and a dry content of typically> 80% after the thermal drying section. Due to the lower dryness and the associated lower strength of the web in the area of the press, the transfer task is more difficult than when the web is transferred after thermal drying, corresponding to the higher dryness and the higher web strength.
    WO 00/31336 in Fig. 1 reveals the typical prior art of a wet end of a cellulose drying machine. It is said that this arrangement is insufficient to meet the demands of higher machine speeds. In particular, the transfer of the strip and the spreading in open areas is a highly complicated and prone to failure process.
    The aim of the invention is a closed web transfer without touching the web by hand, and an improvement in industrial safety. The goal is one more
    3.24
    2694 AT device according to the invention with minimal space requirement, with low overall equipment complexity.
    This is achieved according to the invention in that the strip is guided in a first region between the first covering and the second covering and the strip is transferred from the first covering to the second covering, the first covering being lifted off after the first region and the Strip continues with the second covering, the strip being guided on the second covering to a second region and in the second region the strip being guided between the second covering and a third covering. The machine for producing the fibrous web is in particular a machine for drying pulp. For the transfer, the strip and the web are passed together on the first covering, which is preferably designed as a felt, through at least one press nip of a suction press roll. At least one further roller presses against the suction press roller, mechanical dewatering of the strip and the web occurring in the press nip formed between the suction press roller and the further roller. The press nip is preferably double felted, i.e. the further roll pressing against the suction press roll is also wrapped in a covering, which is also preferably made of felt. In the press nip, the strip and the web are therefore pressed between two coverings, which are preferably designed as felt, one roller of the press nip being a suction press roller. After the press nip, the covering of the other roller is lifted off to avoid rewetting. After guiding the strip together with the web on the first covering through the at least one press nip, the strip is continued on the first covering and the remaining web follows the covering of the further roller to a reject area or reject container of the machine. The suction press roll is designed with at least one suction zone for suctioning the first covering. After the press nip through which the strip and the web are guided together, the suction press roller advantageously allows suctioning of the first covering, at least in the region of the strip, whereby on the one hand the strip guided on the first covering is held on the suction pressing roller and on the other hand a possible one Remoistening after mechanical pressing is minimized. The arrangement described is in particular a combination press in a machine for drying pulp, with a suction press roll, which is operated by a
    4.24
    2694 AT first covering - typically a felt - is wrapped, with at least one, typically two press nips being made against the suction press roll. The press nips are double felted and for transfer the strip is continued on the first covering after the first press nip and the remaining web is fed to the reject area after the first press nip. The strip guided on the first covering is typically transferred to a high-pressure press, e.g. a shoe press, hand over. For this purpose, the first covering and the strip guided thereon are guided into a first region, the first region and in particular the length of the first region being characterized in that the first region begins at the point where the first covering runs onto a second covering. and ends where the first covering is lifted from the second covering, the strip then continuing to follow the second covering. The strip is thus in contact with the first covering and the second covering in the first region and the strip is transferred in the first region from the first covering to the second covering in the sense of a closed train. The first area is further characterized in that the strip in the first area does not pass through a press nip, i.e. In the first area, only compressive forces act on the strips as a result of the tension of the first or the second clothing and the local curvature in the first area. The strip is guided on the second fabric to a second area, the second area being characterized in that the second area begins at the point where the second fabric meets a third fabric. The second covering is typically a felt. The third covering is also typically a felt, and the third covering can also be designed as impermeable. According to the invention, the second covering and the third covering form the coverings of the high-pressure press or the shoe press.
    A favorable embodiment of the method is characterized in that a jet of a pneumatic nozzle acts at least briefly on the first covering lifted off after the first area, the jet acting in a cross-machine area of the first covering, where the strip on the first covering in the first area to be led. According to the invention, the strip follows the second covering after the first region, the first covering being lifted off the second covering at the end of the first region. The beam
    24.5
    2694 AT of the pneumatic nozzle already acts on the first covering shortly after the end of the first area, the beam of the pneumatic nozzle acting in the cross-machine direction acting in a cross-machine area of the first covering, where the strip is guided on the first covering in the first area. The jet of the pneumatic nozzle supports the transfer of the strip to the second covering, i.e. a strip which may possibly incorrectly move along from the first region on the first covering is detached from the first covering by the beam, the strip detached from the first covering being deposited on the second covering by the beam effect and the beam orientation.
    A favorable embodiment of the method is characterized in that a jet of a water nozzle acts on the second fabric in front of the first area, the jet acting in a cross-machine area of the second fabric, where the strip is guided on the second fabric after the first area. The jet of the water nozzle is preferably directed towards the running side of the second covering, the running side of the covering being opposite to the web side of the covering on which the fibrous web rests. The water nozzle is arranged, for example, just before the roller, via which the second covering is fed to the first area, the roller being a grooved roller or a perforated roller. The jet of the water nozzle saturates the second fabric in the effective area of the jet, which increases the smoothness of the second fabric on the web side or reduces the permeability of the second fabric. In accordance with the well-known “glass plate effect”, the strip in the first area will preferably follow the second covering and pass from the less “smooth” or more permeable first covering to the “smooth” or less permeable second covering. A favorable embodiment of the method is characterized in that the strip and the web are guided together with at least the first covering through at least one press nip, the strip being sucked in by the first covering in the area between the press nip and in front of the first area. The machine for producing the fibrous web is, in particular, a machine for drying pulp, the first covering, which is preferably designed as a felt, being guided around a suction press roll. At least one further roller presses against the suction press roller. The suction press roll advantageously allows
    6.24
    2694 AT at least one suction of the first covering after the press nip, through which the strip and the web are led together. On the one hand, the strip guided on the first covering is better held on the suction press roll or
    fixed and on the other hand possible rewetting after the mechanical pressing is minimized.
    Another advantageous embodiment of the method is characterized in that at least the strip in the first area is sucked by the second covering. The first area is characterized in that the first area begins at the point where the first covering runs onto the second covering and ends where the first covering is lifted off, the strip then continuing to follow the second covering. Thus, in the first area, the strip is transferred from the first covering to the second covering in the sense of a closed train. The transfer of the strip from the first covering to the second covering and the fixing of the strip to the second covering is improved according to the invention in that the second covering is vacuumed at least in the region of the strip. It is particularly advantageous to vacuum the second covering primarily in the area of the strip during the transfer of the strip and thus to direct the available vacuum onto this area. After the strip has been transferred and after the strip has been spread out, the second covering can also be vacuumed in the region of the entire web, whereby in particular the entire web is fixed and wrinkles and blistering of the web on the second covering are prevented.
    A further advantageous embodiment of the method is characterized in that at least the strip is at least partially sucked in by the second covering in the area between the first area and the second area. The first area is characterized in that the first area begins at the point where the first covering runs onto the second covering and ends where the first covering is subsequently lifted off, the strip then continuing to follow the second covering. The strip guided on the second covering is led further to a second area, the second area being characterized in that the second area begins at the point where the second covering runs onto a third covering. The fixation of the strip
    7.24
    2694 AT on the second covering in the area between the first area and the second area, is improved according to the invention in that the second covering is vacuumed at least in the area of the strip. It is particularly advantageous to vacuum the second covering primarily in the area of the strip during the transfer of the strip and thus to direct the available vacuum onto this area. After the strip has been transferred and after the strip has been spread out, the second covering can also be vacuumed in the region of the entire web, whereby in particular the entire web is fixed and wrinkling of the web on the second covering is prevented. Suction in the area between the first area and the second area can be implemented by a suction box.
    An advantageous embodiment of the method is characterized in that the second covering is guided in the area between the first area and the second area via a suction box and the second covering is suctioned via the suction box. The suction of the second covering through the suction box takes place during the transfer of the strip, preferably in the region of the strip, in order to fix the strip on the second covering. So the available vacuum is directed to this area. After the strip has been transferred and after the strip has been spread out, the second covering can also be suctioned through the suction box in the region of the entire web, whereby in particular the entire web is fixed and wrinkling of the web on the second covering is prevented.
    An advantageous embodiment of the method is characterized in that the second covering is suctioned indirectly in the first area through a suction box. This can e.g. by guiding the second covering over a roller, the roller being designed as a grooved roller and the suction box located outside the roller directly vacuuming the grooves of the roller and indirectly the second covering. This can e.g. also by guiding the second covering over a roller, the roller being designed as a perforated roller and the suction box lying outside the roller directly vacuuming the perforated roller and indirectly the second covering. In the case of the grooved roller, the suction can be on the area of the strip or else on the
    8.24
    2694 AT can be directed over the entire area by designing the suction box in such a way that the grooves are vacuumed in the area of the strip or in the area of the entire web. In the case of the perforated roller, internals such as e.g. Chambers are provided in order to direct suction to the area of the strip or to the area of the entire web, and in this case too the suction box can be prepared for zonal suction. The suction box for indirect suction of the second covering can either be designed such that only indirect suction of the second covering is provided via the suction box. Or the suction box can be designed such that indirect suction of the second covering and direct suction of the second covering takes place when the second covering is guided over the suction box. The indirect suction of the second covering has the advantage that a much more compact design is possible and, with simultaneous indirect and direct suction of the second covering, only the suction box can be connected to the vacuum system or vacuum system of the machine and the suction effect on both the suction box and the Roll can be extended. Generally there is no need to connect the roller directly to the vacuum system or vacuum system of the machine. The roller according to the invention, designed as a grooved roller or perforated roller vacuumed over the circumference, can in particular be made compact. Suction rolls connected directly to the vacuum system or vacuum system are generally sucked axially through the hub, which requires a larger hub diameter and thus a larger bearing design. Such suction rolls sucked through the bearing are complex in terms of mechanical engineering and for constructional reasons there is a realizable minimum diameter. The roller according to the invention sucked indirectly via the suction box, designed as a grooved roller or as a perforated roller sucked over the circumference, allows smaller minimal diameters to be realized.
    An advantageous embodiment of the method is characterized in that, after the strip has been passed through the second region, the strip cut from the web is spread out and after the spreading, the entire web is guided through the second region. Successfully guiding the strip through the second area means successfully transferring the strip and as a result the width of the strip cut from the web can be increased increasingly
    9.24
    2694 AT, e.g. by moving the fluid cutting beam that cuts the strip from the web in the cross machine direction. With the process of the fluid cutting jet in the cross-machine direction, the width of the strip is increasingly increased until the strip covers the entire web. Thus, after the strip has been transferred and the vehicle has been driven, the entire web is transferred to the second area. The widening is now complete. In the case described, the transfer of the strip coming from a combination press and guided on a first covering, preferably a felt, to a second covering, likewise preferably a felt, is completed, the strip on the second covering together with a third covering in a second Range and further into a high pressure press, which is typically a shoe press.
    An advantageous embodiment of the method is characterized in that the length of the first area is reduced after driving wide. The first region and in particular the length of the first region is characterized in that the first region begins at the point where the first covering runs onto the second covering and ends where the first covering is subsequently lifted off the second covering. During the transfer, the strip continues to follow the second covering. In the first area, the strip is thus transferred from the first covering to the second covering. The presence of the first region when the strip is transferred means a length of the first region greater than zero and a closed guidance of the strip between the press nip, through which the strip and the first clothing are guided, and the beginning of the second region. Thus, the strip between the press nip and the beginning of the second area is always in contact or guided by a covering. The strip is transferred as a closed train. After the strip has been transferred into the second area and after it has been widened, it may be advantageous to reduce the second area to dissolve down to the second area, i.e. After the wide travel, the web is open in a short area or the web changes in a short area from the first covering to the second covering in an open train. In order to implement a closed train when transferring a strip and an open train after the widening, the first covering after the first region is guided over a subsequent roller, the length of the first region being adjustable via the position of the subsequent roller.
    10/24
    2694 AT
    The wrapping of the grooved roller or the perforated roller sucked over the circumference can be adjusted by the first covering through the position of the subsequent roller. According to the invention, it is advantageous to realize a longer first area during the transfer of the strip in order to achieve a better fixation of the strip on the second covering. For this purpose, the following roller is positioned in such a way that there is a greater wrap around the grooved roller or the perforated roller sucked over the circumference by the first covering. After the widening, the following roller can be positioned in such a way that a smaller wrap or no wrap of the grooved roller or the perforated roller sucked over the circumference is given by the first covering. In the case of no wrapping, in particular a relative speed between the first covering and the second covering in the short open area - open draft - can be achieved, the speed of the first covering being less than or equal to the speed of the second covering when the machine for pulp drying is in operation. The smaller the wrap, the more advantageous this is with regard to possible rewetting of the web by the first covering in the first area. A minimal rewetting by the first covering is achieved by a short length of the first area, a certain length being advantageous for a good transfer of the strip from the first covering to the second covering.
    An advantageous embodiment of the method is characterized in that the web consists predominantly of cellulose and has a sheet weight of more than 450 g / m 2 . The invention is particularly well suited for transferring a strip from the combination press into a high-pressure press, in particular into a shoe press, of a machine for drying pulp. According to the invention, a strip is to be transferred in such a machine, the sheet weight of which is greater than 450 g / m 2 . However, it cannot be ruled out that the process of transferring the strip with a sheet weight of <450 g / m 2 is carried out on a machine for pulp drying, for example in order to keep the amount of rejects resulting from the transfer small. However, this in no way contradicts the applicability of the invention for transferring strips on a pulp drying machine.
    io
    11/24
    2694 AT
    A further advantageous embodiment of the method is characterized in that the strip is cut across the entire width of the strip in front of the first region, transverse to the machine direction. On the one hand, a fluid cutting jet is used to cut a strip from the web in the machine direction and to separate the web into a strip and into a remaining web. According to the invention, the strip is now cut across the entire width of the strip in front of the first area, advantageously in front of the press nip. This can be done by a cutting jet from a nozzle, the cutting jet acting across the machine direction across the entire width of the strip. This cutting of the strip over the entire width of the strip interrupts the strip, which is endless per se, with the strip in particular being transferred to the second fabric upstream of the cut during the transfer.
    The invention also relates to a device for transferring a strip of a web in a machine for producing a fibrous web, characterized in that the second covering is guided over a roller in the first region, the roller being a grooved roller or a perforated roller, and the second covering in the first region, at least in the region of the strip, can be sucked indirectly via a suction box by directly vacuuming the grooves of the roller or by directly vacuuming the perforated roller through the suction box. By designing the roller as a grooved or perforated roller, the roller being able to be vacuumed via a suction box located outside the roller, the roller can be made very compact.
    An equally advantageous embodiment of the device is characterized in that the strip and the web are guided together with at least the first covering through at least one press nip, a roller is designed as a suction press roller and the suction press roller is part of the press nip, the first covering wrapping around the suction press roller and the suction press roll has at least one suction zone for suctioning the first covering in the area after the press nip and that the second covering is guided after the first area via a suction box, the second covering being suctionable via the suction box at least in the area of the strip. During the transfer of the strip, it is advantageous to at least in the first covering after the press nip
    12/24
    2694 AT
    Vacuum area of the strip over the suction press roller. This allows the strip to be fixed on the first covering after the press nip. Suctioning the first covering after the press nip is also advantageous with regard to rewetting the strip or the web. After the first area, by vacuuming the second covering, at least in the area of the strip, a better fixation of the strip on the second covering can be achieved, the second covering being guided over a suction box and being able to be sucked over it. After the strip has been widened, both the suction press roll and the suction box advantageously allow suctioning over the entire width of the web.
    A further advantageous embodiment of the device is characterized in that the first covering after the first region is guided over a subsequent roller, the length of the first region being directly adjustable by adjusting the position of the subsequent roller, and a jet of a pneumatic nozzle on the is directed towards the first area lifted first covering, and the beam is arranged in a cross machine area of the first covering, where the strip is guided on the first covering in the first area. The transfer of the strip from the first covering to the second covering takes place in a closed manner via a closed train, the subsequent roller being positioned such that the first covering at least partially wraps around the second covering. After widening, the length of the first area is minimized or the first area is left open. In the case of a minimal first area, the subsequent roller is positioned such that the first covering at least briefly wraps around or touches the second covering, thereby realizing a closed tension. If the first area is left open, the subsequent roller is positioned such that there is a short distance between the first covering and the second covering, so that the web changes from the first covering to the second covering in the region of a short open train. The pneumatic jet directed shortly after the first area ensures that a strip which runs wrongly with the first area after the first area is lifted off the first area and deposited on the second area.
    The invention will now be described by way of example with reference to the drawings.
    13/24
    2694 AT
    Fig. 1 shows a machine for producing a fibrous web according to the
    State of the art.
    Fig. 2 shows the device according to the invention for transferring a strip, wherein the strip is guided closed.
    Fig. 3 shows the device according to the invention for transferring a strip after transferring and spreading the strip with a short open train of the web.
    4 shows the suction box according to the invention for the direct suction of a roller and the indirect suction of the second covering.
    1 shows an overview of the sheet forming unit and the press section of a machine 10 for producing a fibrous web in accordance with the prior art. The sheet forming unit for forming the web 2 is designed as a twin-wire dewatering unit, the press section with a first press unit 6 - and a subsequent press unit 7. Further subsequent units of the machine are not shown. Corresponding to the open tension between the first press unit 6 and the subsequent press unit 7, a strip 1 of the web 2 is first transferred and then extended to the machine width. Also shown is an endless fabric 14 of the first press unit 6 and the endless fabrics 13 and 15 of the subsequent press unit 7. According to FIG. 1, the running direction of the web 2 is from left to right.
    2 shows the device according to the invention and illustrates the method for transferring the strip 1. The strip 1 in the first press unit 6 is cut from the web 2 in front of the press nip 5 and the strip 1 and the remaining web 2 are on the first covering 14 passed through the press nip 5. The remaining web 2 is removed from the first covering 14 after the press nip 5 and moved into a reject area or reject container (not shown). The strip 1 is guided further on the first covering 14 around the suction press roller 4, the suction pressing roller 4 allowing suctioning of the first covering 14 at least in the region of the strip 1 at least after the press nip 5. The first covering 14 and the strip 1 are brought together in a first region 9 with a second covering 13, the second covering 13 being implemented via a roller 11, as a grooved roller 11 or as a perforated roller 11
    14/24
    2694 AT. The roller 11 allows suctioning of the second covering 13 at least in the region of the strip 1. At the end of the first region 9, the first covering 14 is lifted off, the strip 1 continuing to run on the second covering 13. The length of the first region 9, or the point at which the first covering 14 is lifted from the second covering 13, is determined by the position of the roller 18. In Figure 2, the roller 18 is shown in the position for transferring the strip 1 as a continuous circle and the position of the roller 18 after transfer and spreading is shown as a dashed circle. During the transfer, the jet of the pneumatic nozzle 8 acts on the first clothing, the jet of the pneumatic nozzle 8 acting shortly after the first area 9, at least in the cross-machine area of the first clothing 14, where the strip 1 on the first clothing 14 in the first area is led. Between the first area 9 and the second area 19, the covering is guided over a suction box 12, the second covering 13 being sucked over at least in the area of the strip via the suction box 12. The suction box 12 further allows the second covering 13 to be sucked indirectly in the first area 9, the suction box 12 suctioning the roller 11, which is designed as a grooved roller 11 or as a perforated roller 11, directly over the circumference. The second region 19 is characterized by the placement of the third covering 15 on the second covering 13 leading the strip 1. The jet of the water nozzle 16 can act on the second covering 13, the beam acting in a cross-machine area of the second covering 13, where the Strip 1 is guided on the second covering 13 after the first area 9. The jet of the water nozzle 16 allows the second fabric 13 to be saturated with water in the effective area of the jet during the transfer, as a result of which the smoothness of the second fabric 13 on the web side is increased or the permeability of the second fabric 13 is reduced. When the strip 1 has been successfully guided through the second region 19, the transfer of the strip 1 is completed, the strip subsequently being spread out and the entire web 2 being transferred after the spreading out.
    3 shows the device according to the invention after the transfer of the strip 1 and after the widening with a short open train of the web 2. After the widening, the strip 1 has the entire width of the web 2, the web 2 being guided through the press nip 5 and the entire lane 2 continues on the first
    15/24
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    Covering 14 is guided over the suction roll 4. The web 2 after the press nip 5 can be sucked through the first covering 14 via the suction roll 4. The roller 18 is now in the operating position, characterized in that the first region 9 formed during the transfer of the strip 1, which is created by the second covering 13 being wrapped by the first covering 14, is minimized (not shown) or dissolved ( shown in Fig.3). A minimized first area 9 is provided if the first covering 14 and the second covering 13 are still in contact and the web 2 is thus transferred from the first covering 14 to the second covering 13, which results in a closed train. When the first area 9 is dissolved, the first covering 14 and the second covering 13 are spaced apart, i.e. not in contact, and the web 2 is transferred open from the first covering 14 to the second covering 13, thus realizing an open pull (shown in FIG. 3). The advantage of an open train is, in particular, the possibility of realizing different speeds between the first covering 14 and the second covering 13, the speed of the covering remaining or increasing in the machine direction according to the invention. After the wide covering, the second covering 13 has either the same or a higher speed than the first covering 14. With increasing speed in the machine direction, a longitudinal stretching of the web can be compensated, with the result that blistering or streaking can be prevented. According to the invention, the water nozzle 16 can support the transfer of the strip 1, the water nozzle 16 no longer being active after the widening.
    Fig. 4 shows the roller 11, which can be designed as a grooved roller 11 or as a perforated roller 11, wherein the roller 11 is vacuumed directly via the suction box 12 over the circumference. The creasing 17 of the roller 11 or alternatively the perforated suction width 17 of the roller 11 is shown in FIG. 4. During the transfer of the strip 1, suctioning of the second covering 13 is advantageous at least in the area of the strip 1. For this purpose, the suction box 12 can be designed with a separate edge zone 18 in order to concentrate the suction on the area of the strip 1 during the transfer of the strip 1. After widening, suctioning over the entire width of the web 2 can be advantageous in order to fix the web 2 better on the second covering 13 and to prevent blistering and streaking.
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    The present invention thus offers advantages over conventional ones
    Threading devices. In addition to the automatic web transfer without touching the web by hand, and the associated improvement in industrial
    Security, the invention allows automatic with very little space
    Transfer with reduced overall mechanical engineering complexity.
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    权利要求:
    Claims (15)
    [1]
    claims
    1. A method for transferring a strip (1) of a web (2) from a first covering (14) to a second covering (13) of a machine (10) for producing a fibrous web, characterized in that the strip (1) in one first area (9) is guided between the first covering (14) and the second covering (13) and the strip (1) is transferred from the first covering (14) to the second covering (13), after the first Area (9) the first covering (14) is lifted off and the strip (1) with the second covering (13) continues, the strip (1) on the second covering (13) being guided to a second region (19) and in the second region (19) the strip (1) is guided between the second covering (13) and a third covering (15).
    [2]
    2. The method according to claim 1, characterized in that a jet of a pneumatic nozzle (8) acts at least briefly on the first covering (14) lifted off after the first region (9), the beam in a cross-machine area of the first covering (14) acts where the strip is guided on the first covering (14) in the first area (9).
    [3]
    3. The method according to claim 1, characterized in that the strip (1) and the web (2) are guided together with at least the first covering (14) through at least one press nip (5), the strip (1) in the area between the Pressnip (5) and before the first area (9) is sucked through the first covering (14).
    [4]
    4. The method according to claim 1, characterized in that at least the strip (1) in the first region (9) is sucked by the second covering (13).
    [5]
    5. The method according to claim 1, characterized in that at least the strip (1) is sucked at least partially in the area between the first area (9) and the second area (19) by the second covering (13).
    [6]
    6. The method according to claim 5, characterized in that the second covering (13) in the region between the first region (9) and the second region (19) is guided via a suction box (12) and the second covering (13) via the Suction box (12) is sucked.
    [7]
    7. The method according to claim 4, characterized in that the second covering (13) in the first region (9) is sucked indirectly through a suction box (12).
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    [8]
    8. The method according to claim 7, characterized in that the second covering (13) in the first region (9) is guided over a roller (11), the roller (11) as a grooved roller (11) or as a perforated roller ( 11) and the suction box (12) in the case of the grooved roller (11) directly sucks the grooves of the roller (11) or in the case of the perforated roller (11) directly the perforated roller (11), which means via the suction box (12) the second covering (13) is sucked on indirectly.
    [9]
    9. The method according to claim 1, characterized in that after the strip (1) has been passed through the second region (19), the strip (1) cut out of the web (2) is spread out and, after widening, the entire web is passed through the second Area (19) is performed.
    [10]
    10. The method according to claim 1, characterized in that after the widening the length of the first region (9) is reduced.
    [11]
    11.The method according to claim 1, characterized in that the web (2) consists predominantly of cellulose and has a sheet weight of more than 450 g / m 2 .
    [12]
    12. The method according to claim 1, characterized in that the strip (1) in front of the first region (9) is cut across the entire width of the strip (1) transverse to the machine direction.
    [13]
    13. Device for transferring a strip (1) of a web (2) in a machine (10) for producing a fibrous web with a first covering (14) and a second covering (13), and with a first area (9) for transferring the Strip (1) from the first covering (14) to the second covering (13), whereby in the first area (9) the strip (1) is guided between the first covering (14) and the second covering (13) characterized in that in the first region (9) the second covering (13) is guided over a roller (11), the roller (11) being a grooved roller (11) or a perforated roller (11), and the second covering (13) in the first area (9), at least in the area of the strip (1), can be suctioned indirectly via a suction box (12) by directly vacuuming the grooves of the roller (11) or by directly vacuuming the perforated roller (11) through the suction box (12).
    [14]
    14. The apparatus according to claim 13, characterized in that a roll (4) as a suction press roll (4.) Is guided through at least one press nip (5) of the strips (1) and the web (2) together with at least the first covering (14) ) is executed and the suction press roll (4) is part of the press nip (5), the first
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    Covering (14) wraps around the suction press roll (4) and the suction press roll (4) has at least one suction zone for suctioning the first covering (14) in the area after the press nip (5) and that the second covering (13) after the first area (9 ) is guided over a suction box (12), the second covering (13) being able to be sucked through the suction box (12) at least in the area of the strip (1).
    [15]
    15. The apparatus according to claim 13, characterized in that the first covering (14) after the first region (9) is guided over a subsequent roller (18), the length of the first region being adjusted by adjusting the position of the subsequent roller (18) (9) is directly adjustable and wherein a jet of a pneumatic nozzle (8) is directed onto the first covering (14) lifted off after the first area (9), and the jet is arranged in a cross-machine area of the first covering (14) where the strip (1) is guided on the first covering (14) in the first area (9).
    20/24
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    同族专利:
    公开号 | 公开日
    BR102020003578A2|2020-10-27|
    FI20205282A1|2020-10-19|
    AT521367B1|2020-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4921575A|1989-09-25|1990-05-01|Beloit Corporation|Couch press transfer apparatus|
    DE102012202535A1|2011-02-23|2012-08-23|Metso Paper, Inc.|Dewatering device for fiber web machine, comprises metal band and counter roller, around which metal band is arranged to run, such that dewatering gap is formed between metal band and counter roller|
    EP2581491A1|2011-10-12|2013-04-17|Andritz AG|Transfer suction roll for transferring a material web|DE102019134691A1|2019-12-17|2020-11-19|Voith Patent Gmbh|Device and method for transferring a fibrous web|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50358/2019A|AT521367B1|2019-04-18|2019-04-18|DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN|ATA50358/2019A| AT521367B1|2019-04-18|2019-04-18|DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN|
    BR102020003578-9A| BR102020003578A2|2019-04-18|2020-02-20|device and process for transferring a strip from a blanket|
    FI20205282A| FI20205282A1|2019-04-18|2020-03-19|Device and method for transferring a strip of a web|
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