• 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:
    In an arrangement in the treatment of a marginal strip of a pulp drying machine, in which arrangement at the end of the wire section associated with the drying machine for pulp (10) catching devices (20) for catching one of the two edges (15, 16) of the pulp web (14) to be produced Separate edge strip (17) are arranged, it is proposed that the collecting devices (20) has two troughs (21) arranged in conjunction with the two edges (15, 16) are assigned, of which troughs (21) each below the wire section ( 10) for collecting the edge strip (17) by means of gravity in the trough (21) is arranged.
    公开号:AT15393U1
    申请号:TGM50029/2016U
    申请日:2016-02-15
    公开日:2017-08-15
    发明作者:Valtonen Aki
    申请人:Valmet Technologies Inc；
    IPC主号:
    专利说明:

    description
    ARRANGEMENT FOR THE TREATMENT OF AN EDGE STRIP OF A DRYING MACHINE FOR PULP
    The invention relates to an arrangement in the treatment of a marginal strip of a drying machine for pulp, in which arrangement at the end of the drying machine for cellulose associated wire section collecting devices for collecting the separated at the two ends of the pulp web to be produced edge strip are arranged.
    At the end of the wire section, the pulp web is adjusted by separating the edge strips of the pulp web, which edge strips are conveyed down into the pulper below the wire section. As with other fibrous web machines, the Pulper Drying Unit operates during the whole production process. Because of the high basis weight of the pulp web, the pulper in the pulp dryer must be sized large both in volume and in its blending performance so that if the web breaks, the full width pulp web will have room in the pulper. This even requires several rotors and these rotating motors, which means that the operating costs of the pulper become high. The basis weight of the dried pulp web is usually several hundred grams, even over a thousand grams.
    The object of the invention is to produce a novel arrangement for processing the edge strip of a drying machine for pulp, which arrangement is easier than before and cheaper than before from their operating costs. The characterizing features of this invention are indicated in the attached claims. In an arrangement according to the invention the edge strip is collected by gravity and forwarded in a liquid form. More precisely, separate troughs are used, with the aid of which the edge strip is collected and converted into the liquid form. The use of the pulper can be limited. In practice, the pulper can even be switched off during normal operation, which significantly reduces operating costs.
    In the following, the invention will be described in detail with reference to the accompanying drawings, which illustrate some embodiments of the invention, in which Fig. 1 in principle shows the arrangement according to the invention viewed from above, Fig. 2 in principle the invention Arrangement viewed from the side shows.
    In principle, the pulp drying machine is like any fiber web machine in which fiber suspension is fed to the wire and after which the resulting fibrous web is pressed and finally dried. The pulp web dried on the pulp dryer is normally cut into sheets instead of rolled up. On the pulp dryer, however, very heavy grades are produced from the basis weight, and thus the production rate is slow, usually below 250 meters per minute. In addition, the pulp web is dried in a so-called pulp drying oven in which the pulp web is circulated in a closed space on a multi-layer run, for example, carried by the nozzle levels. Between the nozzle levels deflection rollers are arranged. It is trying to minimize the number of web breaks, because the cleaning of the drying cabinet for pulp and the web insertion after the web break are very expensive and time consuming, in practice, they take even several hours to complete.
    In Fig. 1, a part of the drying machine for pulp is shown in principle. In this case, the wire section of the wet end 10 is shown and the Siebpartie associated sieve 11 is fed to the headbox 35 fiber suspension. The screen 11 is supported by means of several rollers, of which here the breast roller 12 and the guide roller 13 are shown. The rollers used are a little wider than the screen. Accordingly, the pulp web 14 formed on the screen is a little narrower than the screen 11. After the wire section 10, the pulp web is conveyed to the press section (FIG. 2). Before the promotion at the end of the wire section, the edge strips 17 are separated at the two edges 15 and 16 of the pulp web 14. The desired width of the pulp web is realized. At the same time, the thinner ones than the other pulp web and possibly the torn edge portions can be removed. This ensures the trouble-free transport of the pulp web on the press section and especially in a closed drying cabinet for pulp.
    To separate the edge strip on the wire section there are cutting devices 18. In practice, the cutting devices 18 are provided as nozzles 19, via which the funded, under high pressure water separates the edge strips of the pulp web. So it's about water cutting against the web. The position of the nozzle can normally be controlled, whereby the pulp web can be adjusted to the desired width. On the shape of the edge to be formed and on the separation of the edge strip of the web can also be practiced by the position of the nozzle influence. In Fig. 2, the position of the nozzle 19 is shown with an arrow.
    To the actual arrangement collecting devices 20 are assigned to catch the separated edge strip 17. In the known technique, the edge strip is conveyed down to the pulper and from there back into the production of the substance. For this purpose, the troughs 20 according to the invention are associated with two troughs 21, arranged in conjunction with the two edges 15 and 16. In practice, a trough on the leader side and a trough on the drive side is arranged. In addition, each of the troughs 21 is arranged below the wire section 10, for catching the edge strip 17 by gravity into the trough 21. In this case, separate conveyor devices are often unnecessary, which in turn simplifies the construction of the arrangement. The lower part of the wire section preferably comprises an area below the area for web formation. The trough is located at the separation point of the edge band and below the separation point.
    In Fig. 2, an inventive arrangement is shown in principle. Here, the wire section 10 is also shown in relation to the basement. The wire section 10 terminates at the guide roller 13, from where the pulp web is conveyed down to the pulper 22 at the beginning of production or web break. During production, the pulp web is conveyed to the press section 23, of which only the pickup roller 24 and the press fabric 25 are shown. In Fig. 2, the edge strip 17 is shown with a dashed line.
    The collected edge strips are diluted with circulating water, for example. The desired thickness is determined, for example, by calculation and on the basis of which the amount of circulating water is suitably regulated. In other words, the trough 21 is assigned a water jet 26 for diluting the collected edge strip, to which a standard flow is arranged. Normally, regulation of the fixed amount of water will suffice, but if necessary, for example, a regulation based on the measurement of the thickness may be used. In any case, when the edge strips get wet, they are swollen and they fall apart, with even simple jets of water are sufficient to break the edge strips into a pumpable form. For example, the edge strips are thinned to a thickness of 2-3%.
    The collected and diluted edge strips are conveyed from the two troughs 21 with tubes 27, which are connected to the common edge strip pump 28, which is preferably arranged in the basement (Fig. 2). In other words, the arrangement is associated with an edge strip pump 28, to which the two troughs 21 are connected to a tube 27. The tube 27 is shown in Fig. 1 with a dashed and dotted line. In the trough, the edge strip is diluted so much that the edge trim pump can be placed in the basement. The troughs and the tubes require little space on the sides and below the wire section. Thus, the arrangement according to the invention is easy to install in retrospect on the already existing machines.
    The surface of the fiber suspension in the trough 21 and in the pipe system is monitored by means of a surface sensor 29. The surface sensor directs the drainage flow from the trough, either by controlling the rotational speed of the edge trim pump 28 or alternatively by means of the surface control valve 30 located on the pressure side of the edge trim pump. Normally, the surface of the pulp suspension is not allowed to rise to the trough. The pulp suspension to be pumped is conveyed back into the material treatment, from where it flows back to the headbox 31 with the pulp suspension.
    With the help of the troughs, the edge strip can be collected easily and controlled. A significant additional advantage is achieved according to the invention by dissolving the marginal strip with water and thus by diluting the marginal strip into a liquid form. A fiber suspension formed in this way can be passed back into the production process via the pipe system. In Fig. 2, the water jet 26 is shown in principle with an arrow and only one tube 27 is shown. In practice, the troughs in the longitudinal direction of the pulp dryer are at substantially the same location.
    Thanks to the troughs, the rotor or the rotors of the pulper can be put out of action during production, because the collected and diluted edge strips are conveyed into the fabric treatment without passing over the pulper. The decommissioning of the rotors reduces the operating costs considerably. The surface of the pulper is controlled during production by opening the valve 32, which is located between the trough and the actual overflow line 33, for example 80% of the surface height. Thus, the water that may flow into the pulper during production does not increase the surface area of the pulper to the actual 100% overflow threshold, but the incoming small amount of water is directed into the duct. Thus, the pulper has sufficient volume to accommodate the incoming pulp web at the beginning of the break as well as the dilute water and no pulp can be passed through the pulper before the drain pumping from the pulper is started. During the web break, the motors are automatically started and the valve 32 is closed. The rotors can also be rotated at times during production, but otherwise they can not be rotated. In practice, the volume of the pulper is several cubic meters and also in the pulper dilution water is introduced (inlet nozzle 34). Both from the trough 21 and from the pulper 22, there are stubs back to the fabric treatment, from where the collected edge strips are promoted back to the headbox 31.
    The trough is sized according to the case according to the production of the drying machine for pulp. Preferably, the length of the trough in the machine direction is greater than the width. The edge strip sure hits the trough despite possible swinging of the edge strip in the machine direction. The length of the trough in the machine direction can be 1000 mm, while the width is 250 mm. Preferably, the trough is also chamfered from its lower part, that is formed as a kind of funnel (Fig. 2). In the trough there are no places where the pulp suspension could accumulate.
    权利要求:
    Claims (5)
    [1]
    claims
    1. Arrangement in the treatment of a marginal strip of a drying machine for pulp, in which arrangement at the end of the dryer section for the cellulose-associated wire section (10) collecting devices (20) for collecting one of the two edges (15, 16) of the cellulosic web (14) to be produced. Separate edge strip (17) are arranged, characterized in that the collecting devices (20) has two troughs (21) arranged in conjunction with the two edges (15, 16), of which troughs (21) each below the wire section ( 10) for collecting the edge strip (17) by means of gravity in the trough (21) is arranged.
    [2]
    2. Arrangement according to claim 1, characterized in that the trough (21) is associated with a water jet (26) for diluting the collected edge strip (17).
    [3]
    3. Arrangement according to claim 1 or 2, characterized in that the arrangement is associated with a Randstreifenpumpe (28), whereby the two troughs (21) are connected to a tube (27).
    [4]
    4. Arrangement according to claim 3, characterized in that the trough (21) is associated with a surface sensor (29) which is provided for guiding the edge strip pump (28) or in connection with the edge strip pump (28) arranged surface control valve (30).
    [5]
    5. Arrangement according to one of claims 1-4, characterized in that the trough (21) is formed as a funnel whose length is greater than the width in the direction of the drying machine for pulp.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE202016100653U1|2016-02-16|
    FI10811U1|2015-03-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4456502A|1981-07-31|1984-06-26|Beloit Corporation|Method for adjusting the format of continuous aqueous fibre suspension delivered by the head boxes of a paper manufacturing machine, and the device for carrying out said method|
    EP1007280A1|1994-03-31|2000-06-14|ES-Systems OY|A method and apparatus for cutting the edge of a moving paper web|
    EP1624104A1|2004-07-30|2006-02-08|Voith Paper Patent GmbH|Method of pressing|
    JP2019148046A|2018-02-28|2019-09-05|セイコーエプソン株式会社|Sheet production apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FIU20154036U|FI10811U1|2015-02-18|2015-02-18|Arrangement for handling the edge strip of a pulp drying machine|
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