• 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:
    A fiber web machine provided with a fabric heater comprising a frame structure (16) disposed in association with a fabric (13) installed in the fiber web machine and fed with a plurality of guide rollers (15), and a distributor (17) for supplying steam in the direction of the fabric (13), wherein the distributing device (17) has a steam distribution surface (19) provided with one or more openings (20), and wherein the fabric heating device (16a) on the side of the fabric (13), the tissue heater (16a) having a sealing surface (19a) surrounding the opening (20), the tissue heating means (16a) being arranged in such a manner in FIG Contact with the fabric (13) is arranged, that at least the sealing surface (19 a) in both the transverse and in the machine direction against the fabric (13) rests that the di e frame construction (16) is arranged in such a manner in the vicinity of one of the guide rollers (15) that in the fabric (13) a deflection against the fabric tension is generated, and that the frame construction (16) has a channel (18) comprising a portion of the steam distribution device (17), wherein a wall (18a) provided in the channel (18) is formed as a vapor distribution surface (19) arranged in a convex shape.
    公开号:AT14236U1
    申请号:TGM9016/2012U
    申请日:2012-11-15
    公开日:2015-06-15
    发明作者:Petter Honkalampi；Riku Pihko；Leena Silakoski；Jorma Snellman；Jarmo Virtanen
    申请人:Valmet Technologies Inc；
    IPC主号:
    专利说明:

    description
    FIBERGLOW MACHINE EQUIPPED WITH A HEATING DEVICE
    The invention relates to a fiber web machine provided with a fabric heating device having a frame structure arranged in connection with a fabric installed in the web and having a plurality of guide rolls, and a distributor for supplying steam toward the web wherein the distribution means comprises a vapor distribution surface provided with one or more openings and a sealing surface surrounding the opening, and wherein the tissue heating means is arranged in contact with the tissue in such a manner that at least the sealing surface in both the transverse and machine directions attached to the fabric.
    Steam is used for many different uses in a fiber web machine. In connection with fabrics, such as a roll supported press felt, steam has two major functions, partially overlapping. Steam is used in attempts to condition the tissue and increase the tissue temperature to improve drainage. Cleaning showers having the whipping water temperature are usually contained in the treatment positions, in which case the heating effect of the steam remains low. On the other hand, tissue heaters are primarily aimed at producing a uniform moisture profile.
    For fabric conditioning devices, it has been proposed to use a fabric supporting reverse roll in which steam is supplied. The steam is supplied via the sheath holes of the reversing roller in the direction of the fabric. However, a reversing roll equipped with a perfected jacket is expensive. In addition, part of the vapor escapes through the bores when the shell rotates, and a part of the energy contained in the vapor is then lost and a mist is simultaneously generated. In other words, the vapor spreads into the surrounding air. The sealing of the shell also presents a challenge when a part of the shell holes is open. There are also fabric conditioners based on cleansing showers and vacuum boxes. Attempts are made to place them after the press nip as soon as possible, like other fabric conditioners. In this way, one has time to besei¬tigen any increases in the fiber temperature before the tissue enters the press nip again. Fabric heating devices are usually so-called profiling steam boxes in which steam is supplied at a high speed via a series of nozzles. Nozzles are expensive, and high-speed steam showers generate fog in the environment, making them inefficient. Furthermore, a tissue heater must be located far away from a press nip, thereby minimizing the advantage of heat on the drainage. A steam box consists of a nozzle receiving frame structure which forms the distributor.
    US Patent No. 1395219 proposes a manual fabric conditioner which can be used to supply steam to a fabric. The fabric conditioner has a steam distribution surface provided with openings for supplying steam.
    The object of the invention is to provide a novel, equipped with a Gewebheizeinrich¬tung fiber web machine, in which steam can be used more efficiently and yet in a simpler manner than before. The characteristic features of the invention are that the frame construction is arranged in such a manner in the vicinity of one of the guide rollers that a deflection against the tissue tension is generated in the tissue, wherein the tissue heater on the side of the tissue, that of the surface in the fiber web machine First, the fabric is sealed against the frame construction, and second, the steam is evenly distributed throughout the fabric web. It is also possible to have one or more flat or even concave sections in the middle of the tissue deflecting
    Steam distribution surface to be arranged, wherein the section is not in contact with the tissue. By providing space defined by such a section, vias may be placed in the tissue for delivery of vapor, or even nozzles may be installed. If the fabric heater is dimensioned and constructed, emphasis should be placed on continuous contact so that wear on both the fabric and the fabric heater can be kept as low as possible. In addition, the vapor pressure itself is surprisingly used to make the fabric and the steam distribution surface easier. The construction and the operating principle of the tissue heating device are also different in other respects from the prior art. In this way it is possible to use lighter and simpler constructions than before. At the same time, the heat energy contained in the steam can be used more efficiently than before. In this way, the same heating effect can be generated with a smaller amount of steam than before. On the other hand, the heating effect can be improved as compared with before, and the power control is also easy in other respects. The steam can be distributed more evenly than before on the fabric, and the effect of fabric wear caused by the heating is small. Preferably, more Dampfverteilöffnungen can be provided as Beibekannten steam boxes, which uses expensive nozzles, which are arranged at a distance from the tissue. In the fabric construction and the material used, elevated temperatures have also been considered.
    The invention will now be described in detail with reference to the accompanying drawings, which illustrate some of the embodiments of the invention, in which: FIG. 1 is a basic diagram of a tissue heating device according to the present invention
    Fig. 2a is an axonometric cross-sectional view of the tissue heater according to the invention; Fig. 2b is a basic diagram of the construction of the thermal heater; Fig. 2c shows some of the tissue heater distributors; Fig. 3 shows the positioning of the tissue heating device according to the invention in one
    Fig. 4a shows a second embodiment of the tissue heating device according to the invention, Fig. 4b shows the tissue heating device of Fig. 4a in the machine direction, Fig. 4c shows a third embodiment of the tissue heating device according to the present invention ¬ shows the invention.
    Fig. 1 shows a part of a fiber web machine according to the invention equipped with a fabric heater 16a. In general, fiber web machines are paper or board machines. Here, the tissue heater is provided in association with a press felt serving as a fabric. In particular, additional heat provided to the pressing process affects both the process itself and the quality of the final product. The heating of the tissue, for example, contributes to the transport of water from the web to the fabric. This increases the dry content after the press and the moisture profile of the web stabilizes. This further improves the productivity and running characteristics of the fiber web machine. In Fig. 1, a press nip or Pressnip10 between a shoe roll 11 and its counter-roller 12 is formed. The fabric 13, here a press felt, also moves through the press nip 10 and thus supports the web 14. Typically, in addition to the press felt located above and also a submerged press felt or belt through the press nip, it moves around the fabric to support the opposite side. The fabric is supported as an endless loop by means of the guide rollers 15.
    In general, the fabric heater 16a has a frame construction 16 that is located in association with the fabric 13 installed in the fiber web machine. In addition, the fabric heater 16a has a distributor 17 for supplying steam toward the fabric 13 (Figure 2a).
    The frame construction is supported on the constructions of the fiber web machine and steam is supplied to the distributor and distributed to the fabric. The fabric heating device works continuously and is in use all the time during production. The distribution device 17 has a steam distribution surface 19 with one or more openings 20 and a sealing surface 19 a, which surrounds the opening 20. In addition, the Gewebheizein¬richtung is arranged in contact with the fabric 13, so that at least the sealing surface 19 abuts both in the transverse machine and in the machine direction of the fabric 13. First, of course, the frame construction on the fabric without special, from a Dicht¬ sealed edge seals formed as projections. On the other hand, the vapor is rapidly distributed to the tissue without the generation of fog in the environment. Furthermore, the arrangement of the fabric heater in the vicinity of a guide roller facilitates the Abdich¬tung. Therefore, the distance of the fabric heater along the fabric between the tangent of the guide roll and the tangent of the downstream end of the steam distribution surface is less than 2200, preferably 300-1200 mm. This distance is influenced in part by the diameter of the guide roll. A large guide roller may be located very close to the tissue heater, although the distance between the tangents is considerable. However, the above distance is selected in such a manner that the minimum distance between the surface of the guide roller and that in the tissue deflection position -on arranged tissue heater is at least 15 mm.
    As shown in Figure 1, the frame construction 16 is arranged in the vicinity of a guide roller 15 in such a manner that a deflection against the tissue tension is produced in the tissue 13. In general, the fabric tension T produces a seal pressure p-1 = T / R when > p2 and p2 is the steam supply pressure and R is the radius of curvature of the surface. In addition, the performance of the fabric heater may be slightly enhanced by passing the boundary layer air away from the fabric surface immediately before the steam supply surface. The frame construction preferably guides the tissue in this way, which then always bears tightly against the tissue heating device. If it is necessary to support the fabric heating means, a loading means is provided which can be used to adjust the pressure which causes the deflection and thus the sealing pressure. Even a small deflection contributes to a seal. Preferably, the deflection is arranged or provided in such a manner that the direction of movement of the tissue changes by 1-15 °, preferably 5-10 °, due to the action of the tissue heating device.
    It is also worth noting that the fabric heater is located on the side of the fabric 13 which is trimmed to the surface of the web 14 made in the fiber web machine. Thus, the greatest thermal effect is exerted on the fabric surface from which it also acts on the outer surface of the web and, for example, improves the smoothness of the surface of the web. The effect of heating the surface facing the fabric a short distance from the press nip is particularly pronounced when thick fabrics are used. Then, it is possible to use exactly this high temperature of the web-contacting tissue surface without losing heat in the thickness direction of the web due to heating. On the other hand, the prior art equipment mainly heats the backside of the fabric. Then, only the back side of the fabric is heated and this heat is very likely to be lost to a plurality of guide rolls disposed on the side of the fabric improving device before being passed through the fabric in the thickness direction.
    With this new working principle, the dimensions of the structure of the Geweb¬heizeinrichtung can be reduced. Consequently, the tissue heater can be as close as possible to the point of arrival of the web or press nip by positioning it on the fabric surface at a distance of 0.5-8 meters, preferably 1-4 meters, before the web
    Press nip in such a manner that the web is also in contact with the fabric at a distance of 50-4000 mm, preferably 200-2000 mm, before the press nip, be arranged. In this way, the advantage for the pressing operations achieved by the additional heat generated by the steam can be maximized. In other words, heat losses to the environment are avoided and heat can be directed directly to the preferred side of the fabric. More generally, the fabric heater is preferably located at a distance of less than two guide rolls from the press nip included in the fiber web machine.
    Fig. 2a shows the basic structure of the frame construction of the Gewebheizeinrich¬tung. Here, the frame structure 16 consists of a channel 18 with a sheet metal construction which forms part of the steam distribution device 17. In other words, earlier expensive nozzles are unnecessary. In addition, the channel forms a compensation chamber, in which the steam is uniformly distributed over the entire area of the tissue heating device. At the same time, the entire channel is also heated, which improves the condensation of the steam. Here, a wall 18a contained in the channel 18 is formed as a vapor distribution surface 19 arranged in a curved shape. Thus it is possible to create the tissue tension and deflection without damaging wear. The surface which is in contact with the fabric may also be replaceable. In this case, the properties of the Geweweheizeinrichtung can be changed by replacing a part. Similarly, a closed part can be replaced with a new one.
    The remainder of the distributor is composed of apertures 20 located in a lower region of the steam distribution surface 19 and serving to convey the steam supplied to the channel 18 towards the fabric 13. In Fig. 2a, this sub-area is shown in phantom and, according to the invention, is surrounded by a sealing surface 19. Due to the structure of the frame construction and the fabric tension, the fabric covers this sub-area in the area of the edges, i. Thus, the fabric is sealed against the channel and misting of the vapor is avoided.
    In addition to the novel distribution device, the steam supply is new and surprising. According to the invention, the steam supply pressure is lower than the pressure generated by the fabric tension. First, the steam supply pressure has been reduced as compared with before. A significant pressure reduction has allowed for a lighter frame construction. Second, the vapor flow rate has been reduced by using a sufficiently large open area. In other words, the combined surface area of the openings should be sufficiently large. At the same time, space and time are provided for the steam to condense, thereby maximizing the use of heat contained in the vapor. When the delivery pressure is less than the tissue tension, the tissue remains firmly attached to the surface. In practice, the fabric can lift the surface at the openings, but this provides more room for the condensation of the vapor. Furthermore, part of the vapor distribution surface may be detached from contact with the tissue. For example, the fabric may abut the steam distribution surface for at least half of the direction of movement, preferably for a minimum of 2/3 of the movement. The easiest way is when the fabric is in contact over the entire deflection area of the steam distribution surface.
    The test equipment is made of laser-cut sheet material having a thickness of about 4 mm. The material is thus thin Blech¬material. In the illustrated embodiment, the openings are round holes, but other shapes are possible. Bushings can also be used. In any case, the holes can be easily produced by means of laser cutting or water cutting. In the embodiment of FIG. 2 c, the holes 20 are additionally provided with a counter bore and the surface in contact with the tissue is finally coated with a wear-resistant coating material. The openings 20 are therefore preferably located in the base material of the wall 18a. The outer dimensions of the tissue heating device described are 40-400 mm, preferably 150-300 mm, in the direction of movement of the tissue, which makes it possible to arrange the same even in confined spaces in the vicinity of the press nip. In Fig. 1, two alternative arrangements are marked with X. The tissue heater may also be supported at its ends in a fully secured manner, in which case the tissue heater may also remain in place during a tissue change. However, the support is preferably created with an adjustment device with which the orientation and position relative to the tissue can be adjusted in a suitable manner. In this case, the steam is supplied to the duct by means of a flexible hose from one end or from both ends.
    FIG. 2b shows the position of the flexible hose with a dashed line. The figure also shows the structure of the steam distribution surface 19. While the basic shape has a large radius of curvature R, the radius of curvature r at the inlet and outlet ends is smaller , In this way, in spite of slightly misalignments and smaller tissue deviations, unnecessary tissue wear is avoided. In addition, the curvature R of the cover may preferably be variable in such a manner that the curvature is sharper at the end than at the beginning. In other words, the radius decreases at least in one position or stepwise. Then, the sealing pressure in the latter part increases, preventing steam from leaking out with the moving fiber web.
    In practice, the maximum steam supply pressure which is used in the proposed Geweweheizeinrichtung, 10 kPa. This also ensures the resistance of the sheet metal construction. In addition, holes of diameter 20mmin, nine rows were used in the test setup (Figure 2c). After the fabric heater, the measured surface temperature was 85-90 ° C, which is 20-30 0 0 higher than normal. After the press nip, the fabric temperature was 60 ° C and the web temperature was accordingly 45 ° C. At the same time, the dry content was several percent better than without a fabric heater, and the web surface was also more uniform. It is preferable to bring the steam as close as possible to the press nip. In practice, the fabric heater may be located at a distance of 500-8000 mm in front of the press nip.
    Fig. 3 shows the positioning of the fabric heater 16a according to the invention in a fiber web machine. Functionally similar parts are denoted by identical reference numerals. Here, the tissue circuit also includes tissue enhancement means 24 disposed in the horizontal portion of the tissue 13, here a press felt, after a pull roll 25. In other words, the tissue repair means 24 is located as early as possible after the press nip 10. Here, the tissue enhancer 24 has cleansing showers 26 that are directed directly at the tissue 13. The cleaning is followed by drying and moisture adjustment of the fabric 13 using two vacuum boxes 27 arranged on the same side of the fabric 13. Four guide rollers 15 are arranged after the fabric improvement device 24 in front of the press nip 10. Well-knit pick-up felt is also provided with appropriate fabric enhancement facilities.
    A second embodiment of tissue heater 16a is shown in greater detail in Figures 4a and 4b. While the working principle is the same as described above, the frame construction, and in particular the steam distribution surface 19, are implemented in a different manner. Here, the steam distribution surface 19 in contact with the fabric 13, and in particular its sealing surface 19a, consists of a tubular frame 22 which at the same time defines a large opening 20 for steam. A channel 18, from which steam is conveyed into the frame 22, is also provided on top of the frame. In the illustrated embodiment, the fabric is easily sealed against the frame and steam has sufficient space and time to condense, effectively releasing heat to the fabric. In this embodiment, the individual nozzles are also not absolutely necessary, but possible. In addition, it is preferable to place steam supply openings in the tubular structure of the frame directly against the fabric, which reduces the wear effect as the fabric is diverted. These Dampfzufüh¬ ments are also shown in Fig. 4a.
    The second embodiment is provided with a fabric catcher 23, which is arranged on the side of the fabric 13 opposite to the tissue heater. The purpose of the fabric scavenger is to collect drops of water that arrive from the back of the felt. The scavenger is equipped with a water removal line, which is shown in Fig. 4a with a dashed line. This fabric heater also has a simple and lightweight construction and small dimensions. In addition, the steam consumption is low and the use of the heat contained in the steam can be maximized. With a fabric heater, the felt can be heated exactly on the side of the felt being directed to the paper surface.
    Fig. 4c illustrates a third embodiment of the fabric heater. Here, the edges and the central region of the steam supply chamber also form a one-piece construction. Thus, a portion of the orifices or nozzles can be recessed and the edges can both seal and steam distribute directly on the tissue. The scavenger may also be a suction box, the cover of which is designed according to the fabric heating device. Thus, the cover is preferably concave, whereas the Geweb¬heizeinrichtung is convex. The fabric heater and the suction box may be made movable relative to one another and / or to the fabric. In this way, for example, the suction box is constantly being used while the tissue heater is being used, if necessary. In other words, the suction box can be used to strip or release the felt from the fabric heater during operation. This at least reduces the friction between the fabric and the fabric heater. The construction is simple and affordable. Furthermore, steam leaks and Vernebe¬lung be reduced.
    The proposed embodiments share the following characteristics with few exceptions. All tissue heaters are placed in front of the press nip and in particular the surface of the web associated with the web is heated. In addition, the distance between the heater surface which is in contact with the tissue and the roller closest to the tissue heater may be different in the middle than at the edges. In other words, the sheet metal construction may be provided with a shape having a distribution effect. In addition, sufficient space is provided for the steam to condense. This can be ensured, for example, by supplying steam from the openings in the fabric heater having a sufficient surface area. At the same time, pressure losses are avoided and the tissue is held firmly to the fabric heater. A bore as the shape of the openings is the simplest mold to be produced, in particular for countersunk or drilled or curved edges. Cleared holes create a larger effective perforated surface without compromising the stiffness of the steam distribution surface. The diameter of the openings is in a range of 5 mm - 30 mm, preferably 10 mm - 20 mm, and the shape of the openings can be selected relatively freely, and even an elongate slot can be used. As it moves across the steam distribution surface, the fabric grasps the perforated surface for about 60mm-200mm, preferably 100mm-150mm, in a transverse position. The perforated area, which is composed of the perforated surface, depends on the dimensions of the tissue heating device in the transverse direction of the machine. The sufficiently perforated area allows a greater amount of vapor to be delivered to the fabric than before without the vapor pressure completely lifting the fabric from the steam distribution surface. In practice, a high steam supply pressure can be applied, which improves the heating effect. In addition, the width of the perforated surface of the fabric heater is smaller than the width of the felt, which completely seals the perforated surface as it contacts the fabric.
    The same purpose is supported by the fact that the perforated surface of the
    Fabric heater is shorter in the machine direction than standing in contact with the tissue Berüh¬rung surface. Then at least the inlet and outlet edges are in contact with the tissue. In addition, a large radius of curvature is used in the curved surface, in which case the wear is reduced. In practice, the curvature R is less than 1,000 mm, preferably 100 mm - 900 mm. With a larger curvature, the loss of steam increases until the vapor pressure is reduced or the pressure of the fabric heating device is increased against the fabric tension.
    In addition to the heating, the fiber web machine according to the present invention has also been optimized in other respects. Additional heat can be best utilized through the use of a particular type of tissue. The fabric according to the present invention is a press felt which has a support structure and a carrier fabric as well as a fiber abrasion layer which is attached at least to the surface facing the web. The basis weight of the fabric according to the present invention is sufficiently low, at most 1,500 g / m 2, preferably 1,100 g / m 2 - 1,300 g / m 2, but has sufficient mass to act as a press fabric. The fiber abrasion layer should be sufficient in its mass and density so that the fabric is capable of both heating up and absorbing water. The maximum dtex values of the fibers of the fiber abrasion layer on the surface side, i. the web side are 17 dtex, preferably 6.7 or 11 or 17. A sufficiently smooth fiber abrasion layer on the web facing side creates a smooth web surface, while a sufficiently rough fiber abrasion layer on the roll side simultaneously prevents the web from blocking during operation. Adds. The fiber abrasion layer on the web-facing side can also consist of two fiber materials or fiber abrasion layers with a different degree of fineness. In such a case, the layer closest to the web may be formed of a slightly rougher fiber material compared to the fiber abrasion layer on the side facing the web; for example 11 dtex / 6.7 dtex / 22 dtex, with the fibers of the surface being named first and then those below the surface and finally those on the back. The tissue heater seals and smooths both the felt and the web. If the web-dressed fiber abrasion layer consists of two fiber materials with a different degree of fineness, the rougher of which is closest to the web, a sufficiently dense felt is achieved for optimum drainage, but the problem of scuffing the web is avoided ,
    PA6 and PA6.6 fibers are commonly used as the raw material of the Faserabrieb¬ layer of press felts. In general, polyamide has good resistance to pressing and good elasticity. Then the tissue in the press nip is compressed and decompressed after the nip, creating a pumping action that contributes to the removal of water from the web. Polyamide is also flexible and thus compensates for uneven loading and allows the felt to be quilted or squared without leaving markings in the web. Because polyamide is also resistant to wear, the use of a tissue heater that is in continuous contact with the tissue is appropriate.
    The tissue heater can be fully utilized by selecting new materials. According to the present invention, at least a part of the material of the fiber abrasion layer of the fabric is PA6.10 or PA12 polyamide fiber or a two-component fiber or a copolyamide fiber. In particular, the web-dressed layer or at least the web-closest layer consists wholly or partly of the above-mentioned specific fiber. This makes it possible to use hot steam at a temperature of up to 100-130 ° C, in which case the fabric remains hot (70-90 ° C) all the time.
    Conventionally used PA6 and PA6.6 polyamides are, as such, advantageous in terms of drainage because they absorb up to 10% water in humid conditions. However, higher absorbency together with a fabric heater exposes the fibers to heat, which causes heat loss Can damage tissue. It has now been invented that some of the fabric fibers are replaced with materials that absorb less water. For example, the water absorbency of the PA6.10 polyamide at 100% moisture is about 3%. Accordingly, the water absorbency of the PA12 polyamide fiber at 100% moisture is about 1.5%. This reduces the penetration of hot steam deep into the fiber texture and improves the durability of the fabric in warm conditions. Nevertheless, the other good properties of polyamide remain. At the same time, the core layers and the back layers of the fabric heat up less than before, and the heating effect is particularly directed to the surface layer and through it to the web. As a result, the effectiveness of the additional heating and the heat effect on the web are improved as compared with before.
    权利要求:
    Claims (14)
    [1]
    Claims 1. A fiber web machine equipped with a fabric heating device which has a frame structure (16) arranged in connection with a fabric (13) installed in the fiber web machine and guided with a plurality of guide rolls (15), and a distribution device ( 17) for supplying steam toward the fabric (13), the distributing means (17) having a steam distribution surface (19) provided with one or more openings (20) and the fabric heating means (16a) on the side of the fabric (13), which is the surface of the web produced in the fiber web machine (14) is aligned, is arranged, characterized in that the Gewebheizein¬richtung (16a) surrounding the opening (20) sealing surface (19a) that the Ge Webeheizeinrichtung (16a) is arranged in contact with the tissue (13), whereby at least the sealing surface (19a) both in the transverse direction and in the Maschinenricht¬tung on the tissue ( 13), the frame structure (16) is disposed proximate one of the guide rollers (15), thereby creating a web tension deflection in the web (13), and the frame structure (16) has a channel (18) forming part of the steam distribution device (17), wherein a wall (18a) provided in the channel (18) is formed as a vapor distribution surface (19) arranged in a convex shape.
    [2]
    2. A fiber web machine according to claim 1, characterized in that the Gewebheiz¬einrichtung (16a) is arranged at a distance of less than two guide rollers (15) in front of the press nip (10) contained in the fiber web machine.
    [3]
    3. The fiber web machine according to claim 1 or 2, characterized in that by the arrangement of the deflection, the direction of movement of the tissue (13) by 1 to 15 degrees, preferably 5 to 10 °, due to the action of the Gewebheizeinrichtung (16a) changes.
    [4]
    A fiber web machine according to any one of claims 1 to 3, characterized in that the channel (18) comprises a sheet metal construction.
    [5]
    A fiber web machine according to any one of claims 1 to 4, characterized in that the openings (20) are arranged in the base material of the wall (18a).
    [6]
    A fiber web machine according to any one of claims 1 to 5, characterized in that the steam supply pressure p2 is lower than the pressure p! which is exerted by the fabric tension on the steam distribution surface (19).
    [7]
    A fiber web machine according to any one of claims 1 to 6, characterized in that a fabric scavenger (23) is disposed on the side of the fabric (13) opposite the fabric heating means (16a).
    [8]
    The fiber web machine according to one of claims 1 to 7, characterized in that the fabric (13) has a reinforcing layer and a fiber abrasion layer dressed to the web (14), wherein the maximum dtex value thereof is 17, preferably 6.7 or 11 or 17 amounts to.
    [9]
    A fiber web machine according to claim 8, characterized in that at least a part of the fiber material of the web (14) dressed fabric (13) is PA6.10 or PA12 o of the two-component or copolyamide fiber.
    [10]
    A fiber web machine according to any one of claims 1 to 9, characterized in that the tissue heating means (16a) operates continuously.
    [11]
    A fiber web machine according to any one of claims 1 to 10, characterized in that the distance of the fabric heater (16a) along the fabric (13) between the tangent of the guide roll (15) and the tangent of the trailing edge of the steam distribution surface (19) is less than 2200 mm, preferably 300 to 1200 mm.
    [12]
    A fiber web machine according to claim 11, characterized in that the minimum distance between the surface of the guide roller (15) and the tissue heater (16a) disposed in the position deflecting the tissue (13) is at least 15 mm.
    [13]
    A fiber web machine according to any one of claims 1 to 12, characterized in that the fabric heating means (16a) is arranged at a distance of 500-8000 mm, preferably 1000-4000 mm, in front of the press nip (10).
    [14]
    A fiber web machine according to any one of claims 1 to 13, characterized in that the web (14) is arranged in contact with the web (13) at a distance of 50 to 4000 mm, preferably 200 to 2000 mm, in front of the press nip (10) , 4 sheets of drawings
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    同族专利:
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    WO2013072560A1|2013-05-23|
    CN204023293U|2014-12-17|
    DE212012000210U1|2014-06-26|
    FI124583B|2014-10-31|
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    DE4402105A1|1994-01-26|1994-06-09|Voith Gmbh J M|Papermaking machine press section - has underpressure and heat applied to the blankets before they enter the press roller gap with the fibre suspension between them|
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    CA3095666A1|2019-10-15|2021-04-15|Ibs Of America|A system, control system, an inspection system, and a method of controlling and cleaning a steam box|
    法律状态:
    2018-07-15| MM01| Lapse because of not paying annual fees|Effective date: 20171130 |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20116150A|FI124583B|2011-11-17|2011-11-17|Fiber web machine with fabric heater|
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