• 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:
    Web stabilizer (6) comprising a downwardly floating, stationary support surface (8) for supporting a running paper web (3) in a paper machine. According to the invention, the web stabilizer comprises a heat generating means for heating at least a part of the web stabilizer support surface to a temperature of at least 50 ° C, whereby lint and dust are prevented from sticking to the heated part of the support surface. Fig. 1
    公开号:SE1050779A1
    申请号:SE1050779
    申请日:2010-07-09
    公开日:2012-01-10
    发明作者:Bengt Andersson
    申请人:Metso Paper Karlstad Ab；
    IPC主号:
    专利说明:

    l0 l5 20 25 30 35 a continuous paper web. The support is heated to 10 ° F to heat the paper web in order to dry a coating layer on the top of the paper web.
    Dust formation is a known problem in the drying section and the subsequent winding section of machines for the production of tissue paper. During the drying and winding up of the paper web, lint and "dust" are released in the form of fiber parts and other particles, which accumulate on the web stabilizers above the running paper web. This is especially a problem when the environment between the drying section and the wheelchair is relatively humid, which humid environment facilitates the accumulation of lint and dust on the web stabilizers. A dissolver or pulp arranged along the paper web between the drying section and the wheelchair can contribute to such a humid environment.
    When a sufficient amount of lint and dust has accumulated, the moisture of damp lint and dust risks detaching from the web stabilizers and falling onto the paper web. This can lead to the paper web being damaged, with deterioration in the quality of the rolled paper web as a result, or to the paper web coming off, which is of course not desirable as it leads to a production interruption.
    To improve this situation, it is known to try to collect lint and dust at the place or places where the emission of these is greatest, e.g. when scraping the paper web from the drying surface of the drying section. Another known way of improving the dust situation is to screen or enclose the spaces where the release of lint and dust is large and to ensure a good air exchange with associated air filtration in these spaces. Such a system is described, for example, in the above-mentioned document EP 1 337 708 Bl. Although known systems for preventing the spread of lint and dust can in some cases significantly reduce the amount of lint and dust in the area between the drying section and the wheelchair, it has been found that accumulation of lint and dust on the web stabilizers is still is a problem. The object of the present invention is to solve or in any case substantially reduce this problem and to provide a web stabilizer which reduces the risk of accumulation of lint or dust.
    The web stabilizer according to the invention is characterized by a heat generating means for heating at least a part of the web surface of the web stabilizer to a temperature of at least 50 ° C, whereby lint and dust are prevented from sticking to the heated part of the support surface.
    The method according to the invention is characterized in that a heat-generating member of the web stabilizer is caused to heat at least a part of the support surface to a temperature of at least 50 ° C, whereby lint and dust are prevented from sticking to the heated part of the support surface.
    The invention will be described in more detail below with reference to the accompanying drawings.
    Figure 1 schematically shows the area between a drying section and a wheelchair of a machine for manufacturing tissue paper.
    Figure 2 shows an embodiment of a web stabilizer according to the invention in a perspective view obliquely from above.
    Figure 3 shows the web stabilizer according to figure 2 in a perspective view obliquely from below.
    Figure 4 shows the web stabilizer according to Figure 2 in a partially transparent view. Figure 1 schematically shows a drying section 1 and a wheelchair 2 of a machine for manufacturing a tissue web 3.
    The drying section 1 comprises in a known manner a drying surface 4 in the form of a Yankee cylinder. The wheelchair 2 comprises on an edge set a winding roller 5 for winding the paper web 3.
    In the area between the drying section 1 and the wheelchair 2, the machine comprises a plurality, in this case three, web stabilizers 6 and a guide roller 7, which are arranged to guide the paper web 3 from the drying section 1 to the wheelchair 2. The web stabilizers 6 are arranged to guide, guide, stabilize, other running direction of or otherwise support the running paper web 3 in a manner known per se. The web stabilizers 6 thus form paper web guiding or paper web supporting means, where the very function of supporting paper web 3 takes place in a conventional manner and therefore will not be described in more detail.
    Each web stabilizer 6 has a support surface 8, which faces downwards towards the running paper web 3 in order to support the running paper web 3 in a known manner. In the embodiment shown, each web stabilizer 6 is mounted so that its support surface 8 faces downwards and consequently 6.
    The web stabilizers 6 are in this case passive and the support surface 8 of each web stabilizer 6 is consequently substantially flat and smooth with the exception of its upstream end 9 and downstream end 10, where the support surface 8 bends away from the paper web 3 to allow a favorable air flow between the support surface 8 and the paper web 3.
    Each web stabilizer 6 can be heated so that at least a part of its support surface 8 can be brought to a temperature of at least 50 ° C, which partly prevents moisture from condensing on the heated surface, and partly brings any water mist which ends up on the heated surface to evaporate quickly. By keeping the heated surface dry, lint and dust are prevented from sticking to it, which in turn prevents larger shocks of lint and dust from accumulating on the surface, which shocks at a later stage could detach from the web stabilizer and damage paper web or disrupt the production process.
    Experiments have shown that for most operating conditions the temperature of the heated surface should be at least 50 ° C, as mentioned above, but more preferably the temperature of the heated surface is at least 100 ° C and most preferably at least 170 ° C in order to required dryness of the heated surface. heated surface should be reached.
    With a web stabilizer, the risk of accumulation of lint and dust is greatest at the downstream end of the support surface. Accordingly, preferably at least the downstream end 10 of the respective support surface 8 is heated in the manner indicated above. More preferably, however, the upstream end 9 of the support surface 8 is also heated in the manner indicated above. Most preferably, the entire support surface 8 is heated in the manner indicated above.
    The web stabilizer 6 will be described in more detail below with reference to Figures 2-4. The web stabilizer 6 has a substantially rectangular extent and has two substantially parallel end portions 13, 14.
    The web stabilizer 6 further comprises an elongate, curved roof portion 15 and an elongate and substantially flat bottom portion 16, which at their long sides connect to the long sides of the roof portion 15. The roof portion 15 and the bottom portion 16 are substantially perpendicular to the end portions 13, 14 and connect at their ends thereto. The bottom portion 16 and the parts of the roof portion 15 adjoining the bottom portion 16 thus define said support surface 8. The transitions between the roof portion 15 and the bottom portion 16, which form the upstream end 9 and downstream end 10 of the support surface 8, are curved to allow a favorable air flow under the support surface 8 when the web stabilizer 6 is in operation.
    The web stabilizer 6 also comprises fasteners 17 in the form of fastening loops or fastening ears, which are arranged at the end portions 13, 14 to form mounting points for fastening the web stabilizer 6 to a suitable frame, for example as shown in figure 1.
    The end portions 13, 14, the roof portion 15 and the bottom portion 16 are preferably of stainless steel, which may for example be about 1-8 mm thick, preferably 2-4 mm, depending on the width of the web stabilizer, where a wide web stabilizer requires thicker goods than a narrow one in order for the web stabilizer to retain its shape. The web stabilizer 6 thus has an internal space 18, which is delimited by said portions 13-17.
    The web stabilizer 6 further comprises a heat generating means in the form of a tube 19 arranged inside the space 18, which forms a flow channel for steam. The tube 19, which is also preferably made of stainless steel, rests on the bottom portion 16 and runs in a serpentine path between the end portions 13 and 14. The tube 19 opens into two bushings 20 and 21 in one end portion 13, which bushings 20, 21 also forms connectors for connecting the pipe 19 to an external steam source.
    The length of the pipe 19 is such that the pipe 19 extends over substantially the entire bottom portion 16. Four transverse brackets 22 in the form of plates, preferably of stainless steel, extend inside the space 18 between the roof portion 15 and the bottom portion 16. The brackets 22 are substantially parallel to the end portions 13, 14 and attached to the bottom portion 16, preferably by spot welding. Each clamp 22 has openings for the tube 19 and has the task of keeping the tube 19 in contact with the bottom portion 16, but at the same time allowing the tube 19 to expand and move when the thermal expansion of the tube 19 so requires. this.
    When the web stabilizer 6 is in operation, steam is caused to flow through the pipe 19, whereby the pipe 19, through its contact with the bottom portion 16, is caused to heat both this portion 16 and the long edges of the roof portion 15, which connects to the bottom portion 16, to a temperature which gives the support surface 8 an external temperature of at least 50 ° C, which, in the same way as described above, partly prevents moisture from condensing on the support surface 8, and partly causes any water mist which ends up on the support surface 8 to evaporate quickly.
    It will be appreciated that the tube 19 may alternatively be drawn so that only a part of the support surface 8, e.g. only its downstream end 10 and / or its upstream end 9 are heated in this way.
    To prevent a harmful overpressure from forming inside the space 18, e.g. in the event of a leak occurring in the pipe 19, the space 18 is preferably arranged in open communication with the surrounding atmosphere. Preferably this is achieved by one of the end portions 13, 14 having an opening (not shown).
    The invention has been described above on the basis of a specific embodiment. It will be appreciated, however, that other variants and embodiments fall within the scope of the invention. It is realized e.g. that the heat generation inside the web stabilizer can take place in a variety of ways. The heat generating system can e.g. be an electric heating system, an induction heating system or a system based on heating using hot oil. It will also be appreciated that the invention is equally applicable to active web stabilizers as to the passive web stabilizers described above.
    权利要求:
    Claims (13)
    [1]
    A web stabilizer (6) comprising a downwardly facing, stationary support surface (8) for supporting a running paper web (3) in a paper machine, characterized by a means for heating at least a support surface (8) to a heat generating means (19). part of the web stabilizer (6) temperature of at least 50 ° C, thereby preventing lint and dust from adhering to the heated part of the support surface (8) -
    [2]
    Track stabilizer (6) according to claim 1, characterized in that the heated part of the support surface (8) comprises at least the upstream end (9) of the support surface (8).
    [3]
    Track stabilizer (6) according to claim 2, characterized in that the heated part of the support surface (8) also comprises the downstream end (10) of the support surface (8).
    [4]
    Track stabilizer (6) according to claim 3, characterized in that the heated part of the support surface (8) comprises the entire support surface (8).
    [5]
    Web stabilizer (6) according to any one of claims 1-4, characterized in that said temperature is at least 100 ° C.
    [6]
    Track stabilizer (6) according to any one of claims 1-5, characterized in that said temperature is at least 170 ° C.
    [7]
    Track stabilizer (6) according to one of Claims 1 to 6, characterized in that the heat-generating means comprises a tube (19) which is arranged inside the web stabilizer (6) and forms a flow channel for steam. 10 15 20 25 30 35
    [8]
    Track stabilizer (6) according to claim 7, characterized in that the tube (19) is arranged in contact with the bottom portion (16) of the track stabilizer (6).
    [9]
    Track stabilizer (6) according to any one of claims 1-6, characterized in that the heat-generating means comprises something of an electric heating system and an induction heating system tube.
    [10]
    Paper machine for producing a paper web (3), comprising a drying section (1) for drying the paper web (3) and a wheelchair (2) for winding the paper web (3), characterized in that at least one web stabilizer (6) according to any one of claims 1-9 is arranged between the drying section (1) and the wheelchair (2) to support the paper web (3).
    [11]
    Paper machine according to claim 10, characterized in that it is a tissue machine.
    [12]
    Paper machine according to claim 11, characterized in that the drying section (1) comprises a Yankee cylinder (4) from which the paper web (3) is wet creped.
    [13]
    Method for supporting by means of at least one web stabilizer (6) a running paper web (3) between a drying section (1) and a wheelchair (2) in a paper machine, which web stabilizer (6) comprises a downwardly facing , stationary support surface (8) for supporting the paper web (3), characterized in that a heat generating means (19) of the web stabilizer (6) is caused to heat at least a part of the support surface (8) to a temperature of at least 50 ° C, thereby preventing lint and dust from adhering to the heated part of the support surface (8) -
    类似技术:
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    同族专利:
    公开号 | 公开日
    SE534990C2|2012-03-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2014-03-04| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050779A|SE534990C2|2010-07-09|2010-07-09|Heated web stabilizer to support a running paper web in a paper machine|SE1050779A| SE534990C2|2010-07-09|2010-07-09|Heated web stabilizer to support a running paper web in a paper machine|
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