• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    The invention relates to a shoe press belt (10) for a shoe press, which shoe press belt (10) is an endless loop-shaped body having an inner surface (11) and an outer surface (12), and which shoe press belt (10) comprises an elastomeric body and an elastomeric body 20 21, 22, 23). The elastomeric body comprises a plurality of parallel drainage grooves (50, 50a, 50b) on the outer surface (12) of the shoe press belt (10), with a base (53) between two adjacent drainage grooves (50a, 50b), and at least a first of said drainage grooves (50, 50a, 50b) comprising a first wall (60) of the dewatering groove (50, 50a, 50b), a second wall (70) of the dewatering groove (50, 50a, 50b), and a first wall (60) of the dewatering groove (50, 50a, 50b) and a second wall (60) between the wall (70). The first wall (60) of the dewatering groove (50, 50a, 50b) comprises a plurality of parallel dewatering groove auxiliary grooves (100, 100a, 100b). The invention further relates to a paper machine, a cardboard machine or a pulp drying machine comprising said shoe press belt (10) and a method for mounting the shoe press belt (10).
    公开号:FI20195046A1
    申请号:FI20195046
    申请日:2019-01-25
    公开日:2020-07-26
    发明作者:Jari Jännetyinen；Vesa-Matti Riihioja
    申请人:Valmet Technologies Oy；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION The present invention relates to a shoe belt. The invention further relates to a paper, board or pulp drying machine comprising a press belt. The invention also relates to a method for mounting a press belt on a paper, pulp drying or board machine. - Background of the invention Shoe presses - are used - for example - in connection with - paper machines - press parts. Their purpose is typically to remove water from the fibrous web. A shoe press usually has a stationary press shoe surrounded by a loop-shaped endless press strap. Said press belt can be called a shoe press belt. BRIEF SUMMARY OF THE INVENTION The press belt according to the invention is characterized by what is stated in the characterizing part of claim 1. The method according to the invention for mounting the press belt is characterized by what is stated in the characterizing part of claim 15. The paper machine, board machine or pulp drying machine according to the invention is characterized in that it comprises at least one, preferably at least two, press belts according to the invention. & O The press strap for the shoe press is suitably an endless loop a-shaped piece with an inner surface and an outer surface. The press belt comprises an I 30 - suitably elastomeric body comprising a plurality of parallel dewatering grooves on the outer surface of the press belt. There is then a base between two adjacent 3 drainage grooves. At least the first of these
    LO O of the drainage groove comprises N - the first wall of the drainage groove, - the second wall of the drainage groove, and
    - the bottom of the drainage groove between the first wall and the second wall of the drainage groove.
    The press belt - further comprises - preferably - an elastomeric body - a support structure, which support structure preferably comprises a plurality of support wires fitted inside said elastomeric body. Said elastomeric body may contain at least 50% by weight, preferably at least 70% by weight of polyurethane.
    - The first wall of the dewatering groove of the press belt may comprise a plurality of parallel auxiliary grooves of the dewatering groove extending to the outer surface of the press belt. In addition, the second wall of the drainage groove may comprise a plurality of parallel drainage groove auxiliary grooves extending to the outer surface of the press belt.
    Said auxiliary grooves of the drainage groove may be at least 200 / m measured from one drainage groove in the longitudinal direction of said drainage groove. More preferably, said auxiliary grooves of the dewatering groove are at least 200 / m measured from one wall of the dewatering groove in the longitudinal direction of said dewatering groove. Most preferably, there are a total of at least 400 / m of said dredging auxiliary grooves measured from both walls of one dewatering groove in the longitudinal direction of said dewatering groove. Said plurality of dewatering groove auxiliary grooves enhance the drainage of water from the web and their operation may be enhanced as the number of dewatering groove auxiliary grooves increases - so that the best result can be obtained when there are at least 400 said dewatering groove auxiliary grooves measured from both walls of one dewatering groove N in the longitudinal direction of said one dewatering groove.
    S a At least one auxiliary groove of the dewatering groove may have a slightly curved shape I 30 - so that the radius of curvature 100R of said at least one auxiliary groove is at least c 10 mm. Preferably, the auxiliary grooves having said slightly curved shapes have 3 at least 100 pieces / m, more preferably at least 200 pieces / m and most preferably 3 at least 400 pieces / m measured from one dewatering groove in the longitudinal direction of said N water grooves. Said slightly curved shape can - enhance the removal of water from the fibrous web to be dried.
    The press belt may comprise at least 140 pieces / m of dewatering grooves, measured transversely to the direction of rotation of said press belt, the walls of which include auxiliary grooves in the dewatering groove, which preferably extend to the outer surface of the press belt. The effect of the auxiliary grooves of the dewatering grooves is - typically - enhanced as the number of dewatering grooves comprising - the dewatering groove - the auxiliary grooves - increases. A plurality of parallel auxiliary grooves of the dewatering groove may be arranged so that each auxiliary groove extends in a direction which forms an angle α of at least 5 * with respect to the bottom of said dewatering groove. In addition, the distance between the center lines of the auxiliary grooves of two adjacent drainage grooves is preferably at least 1 mm and at most 5 mm. The width of the auxiliary groove of the drainage groove may be not less than 0,1% and not more than 6,5% of the width of the drainage groove. In addition, the depth of the auxiliary groove of the dewatering groove may be at least 0.1% and at most 6.5% of the depth of the dewatering groove. The depth of the first dewatering groove may be at least 0.4 mm and preferably at most 2.0 mm. The dimension of the auxiliary groove of the dewatering groove in the depth direction of the dewatering groove is preferably at least 60% with respect to the depth of the dewatering groove. The dewatering grooves are preferably substantially in accordance with the direction of rotation of the press belt. In the method for mounting a press belt on a paper, pulp drying, or board machine, a press belt according to the invention is preferably made available, and said press belt is installed in connection with a shoe press.
    S N Thanks to the auxiliary grooves in the wall of the dewatering groove described above, it is possible, among other things, to increase the efficiency of water removal from the fibrous web to the dewatering groove and thus to achieve a higher dry matter content of the fibrous web. The higher dry matter content of the fibrous web I 30 - can be achieved thanks to the auxiliary grooves not only by increasing the drainage of water from the fibrous web to the dewatering groove, but also by increasing the drainage of water from said dewatering grooves. In this case, the dewatering process can be indirectly influenced in such a way that a higher dry matter content of the N fibrous webs can be achieved, because water can be removed - more efficiently - from the press belt before the press belt is reused to remove water from the web.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows an example of a shoe press belt mounted on a shoe press, Figure 2a shows an example of a shoe press belt, Figure 2b shows an example of a shoe press belt Figures 4a-c - show some examples of auxiliary grooves of a dewatering groove of a shoe press belt, and Figures 5a-b - show an example of auxiliary grooves of dewatering grooves in a cross-sectional view. - Figures 1 to 5 use corresponding numbers or symbols for the corresponding parts.
    Images are observational images that are not to scale.
    Detailed description of the invention
    = The following reference numbers are used in this application: N 1 shoe press, O 2 press shoe, O 3 counter roll, I 30 4 press zone, o 6 first paper machine fabric, e.g. press felt, S 7 second paper machine fabric, O 8 fiber web, N 10 press belt for shoe press, i.e. shoe press 10 the thickness of the shoe press belt, D1 the direction of rotation of the shoe press belt, i.e. the first longitudinal direction,
    D2 - second longitudinal direction of the shoe press belt, 11 inner surface of the shoe press belt, 12 outer surface of the shoe press belt, 20 shoe press belt support structure, 5 21 shoe press belt support strip 50 depth of drainage groove, 53 base between two adjacent drainage grooves 50a, 50b, 53b — width of base 53 between drainage grooves, 54 distance between center lines of two adjacent drainage grooves, 60 first wall of drainage groove, 70 second wall of drainage groove 100b, 100 of drainage groove 100 - auxiliary groove of the dewatering groove - i.e. auxiliary groove of the wall of the dewatering groove of the shoe press belt, 100R radius of curvature of the auxiliary groove of the dewatering groove, 101 width of the auxiliary groove 100, 100a, 100b, 102 depth of the auxiliary groove 100, 100a, 100b, 103 auxiliary groove 100, 100a , 100b length, 104 —dewateringour the bottom of an auxiliary groove 100, 100a, 100b, 105 the base between two adjacent auxiliary grooves, 105b the width of the base between the auxiliary grooves, = 106 the distance between the center lines of two adjacent auxiliary grooves, N 107 the dimension of the auxiliary groove in the depth direction of the dewatering groove O to the depth of the dewatering groove 52, a 108 first wall of the auxiliary groove of the dewatering groove, I second wall of the auxiliary groove of the dewatering groove, ca inclination of the auxiliary groove relative to the bottom 3 of the dewatering groove 50, 50a, 50b, 3 W inclination of the auxiliary groove with respect to the first direction N and B the slope of the drainage groove with respect to the vertical.
    In this application, the terms first direction D1 and second direction D2 of the press belt are used. The first direction D1 means the direction of rotation of the press belt 10. By the second direction D2 is meant a longitudinal direction transverse to the direction of rotation D1 of the press belt 10. In addition, the term press belt thickness 10a is used, which means the thickness of the press belt in the depth direction of the press belt, i.e. in the normal direction of the inner surface of the press belt.
    In addition, the terms Machine Direction (MD) and Cross Direction (CD) are used in this application. The machine direction MD means the direction of travel of the fibrous web. This direction substantially corresponds to the direction of rotation of the press belt 10, i.e. the first direction D1 at the point of the press belt 10 at the fibrous web 8.
    By the transverse direction CD is meant the longitudinal direction transverse to the direction of travel of the fibrous web 8, i.e. to the machine direction MD. The transverse direction CD corresponds to the second direction D2 of the shoe press belt 10, i.e. to the longitudinal direction transverse to the direction of travel D1 of the shoe press belt.
    Substantially machine direction MD in this application means that the direction does not deviate from said machine direction MD by at most 10 degrees, more preferably at most 5 degrees and most preferably at most 3 degrees. In this application, substantially D1 according to the first direction of the press belt means that the direction does not deviate from said first direction D1 by more than 10 degrees, more preferably not more than 5 degrees and = most preferably not more than 3 degrees In this application, substantially transverse CD and N substantially second direction D2 means that the direction does not deviate from said transverse direction CD, i.e. from the second a direction D2, by at most 10 degrees, more preferably at most 5 degrees and z 30 - most preferably at most 3 degrees. In this application, substantially diagonally arranged c means that the direction deviates from the transverse direction S by 30-60 degrees, preferably by 40-50 degrees.
    > N Shoe presses 1 are typically used in the press section of a paper, pulp dryer or - board machine. Figure 1 shows — in simplified form, the placement of the shoe press belt 10 in connection with the shoe press 1.
    The shoe press 1 with the shoe press belt 10 can be used for drying the fibrous web 8. The shoe press 1 typically comprises a counter roll 3 and a press shoe 2, between which there is a compression zone 4. An extended compression zone, i.e. a so-called compression zone, is then formed between the press shoe 2 and the counter roll 3. long nip. The purpose of the shoe press 1 is typically to remove water from the fibrous web 8. A shoe press belt 10, at least one paper machine fabric 6, 7, preferably two paper machine fabrics 6,7, is arranged to be driven through the pressing zone 4, and the fibrous web 8 is to be dried. supported by at least one paper machine fabric 6,7, such as a felt and / or wire. —The shoe press belt 10 is or can be fitted to the shoe press 1 so that its outer surface 12 faces the fibrous web 8 and its inner surface 11 faces the press shoe 2. One surface of the wet fibrous web 8 is typically pressed by a rotating counter roll 3 while the other surface of the fibrous web 8 is pressed , surrounded by a loop-shaped shoe press belt 10 having a flexible body. In use, the shoe press belt 10 typically passes through a compression zone 4 between at least one counter roll 3 and the press shoe 2. Preferably, a paper machine fabric 6, preferably a press felt, is arranged, or is intended to be fitted, against the shoe press belt 10. The fibrous web 8 on the surface of the press felt or the like = paper machine fabric 6,7 is conveyed through N shoe press 1 so that the outer surface 12 of the shoe press belt 10 is in direct contact with the paper machine fabric 6, preferably the press felt, and the inner surface 11 of the shoe press belt 10 slides.
    O 3 Typically, the press shoe 2 and the counter roll 3 are pressed in the pressing zone 3 towards each other so that the shoe press belt 10, at least N one paper machine fabric 6,7 and the fibrous web 8 to be dried driven between them are compressed. - For example, the press felt is typically adapted to compress in the compression zone and return substantially to its original thickness after compression. Figure 2a shows an example of a shoe press belt 10. In this application, a press belt for a shoe press, i.e. a shoe press belt 10, means an endless loop-shaped press belt intended for use in connection with a shoe press 1. Preferably - the shoe press belt 10 - is suitable - for use - in the shoe press of the press section of a paper, pulp drying and / or board machine.
    The shoe press belt 10 has an inner surface 11 and an outer surface 12. The outer surface 12 of the shoe press belt has a drainage groove 50 and bases 53 therebetween. The shoe press belt 10 may or may not have a pattern - the inner surface 11 of the shoe press belt 10 comprises a shoe press belt. The depth of roughening can be, for example, 0 to 5 μm or 0.05 to 2.00 μm. The depth of roughening is preferably at most 5 μm, more preferably at most 2.00 μm, and most preferably at most 0.99 μm. In addition, the depth of roughening may preferably be at least 0.01 μm, more preferably at least 0.05 μm and most preferably at least 0.10 μm. Said roughness of the inner surface of the shoe press belt can have a significant effect on the durability of the shoe press belt. For example, if the integrity of the lubricating oil film on the inside were to break, the combination of a smooth press shoe metal surface - a rough shoe press belt inner surface would not brake as easily - as a combination of a smooth press shoe metal surface - smooth shoe press belt = inner surface. In such a situation, the shoe press belt N having the roughened inner surface 11 is thus not as easily damaged as the shoe press belt having a smooth inner surface O. In other words, without the roughening a of the inner surface 11, one point of the shoe press belt would brake the integrity of the lubricating oil film I 30 - severely interrupted by the smooth surfaces while the rest of the part continues the journey c at an earlier pace. This can result in a permanent deformation S of the shoe press belt. The outer surface 12 of the shoe press belt preferably comprises a small pattern, i.e. a so-called roughening. The depth of roughening on the outer surface 12 of the shoe press belt 10 may be, for example, 0 to 50 μm or 0.05 to 10.00 μm. The depth of roughening on the outer surface 12 of the shoe press belt may suitably be at most 50 or at most 40, more preferably at most 20 or at most 10, and most preferably at most 5 or at most 3.
    In addition, the depth of roughening on the outer surface 12 of the shoe press belt 10 may suitably be at least 0.01 μm, more preferably at least 0.05 μm and most preferably at least 0.10 μm.
    The appropriate roughness of the outer surface of the shoe press belt can have beneficial effects on its operation in conjunction with paper machine fabric.
    The shoe press belt 10 preferably has an elastic body which has the ability to return to its original shape after pressing.
    The shoe press belt 10 preferably comprises an elastomeric material as its main raw material.
    Most preferably said elastomeric material consists of polyurethane or contains mainly polyurethane.
    Suitably the shoe press belt - comprises at least 50% by weight of polyurethane, - more preferably at least 70% by weight and most preferably at least 80% by weight based on the total weight of the shoe press belt.
    In addition, the shoe press belt may comprise up to 99.9% by weight of polyurethane, more preferably up to 97% by weight and most preferably up to 95% by weight based on the total weight of the shoe press belt.
    Polyurethane can improve the properties of a shoe press belt - and is particularly well suited - for use in conjunction with auxiliary grooves in the dewatering grooves of a shoe press (shown, for example, in Figures 4a-5b). When polyurethane is used as an elastomeric material, the polyurethane can be - produced in a manner known in the art.
    Most preferably = the polyurethane is prepared by mixing a urethane prepolymer containing N-terminated isocyanate groups with a chain extender, preferably with an O chain extender comprising amine groups (HN2-), OH groups or N mixtures thereof.
    I 30 o The circumference of the shoe press belt 10 is determined in such a way that the inside diameter of the 3 shoe press straps 10 during use is suitable for 3 applications.
    The in-use inner diameter N of the shoe press belt 10 is suitably 0.7-2.5 m, more preferably 1.0-1.9 m, and most preferably 1.09-1.82 m.
    The circumference of the shoe press belt 10, i.e. the length of one turn, is suitably at least 2.2 m, more preferably at least 3.0 m and most preferably at least 3.4 m.
    In addition, the circumference of the shoe press belt is suitably at most 6.3 m, more preferably at most 60 m and most preferably at most 5.8 m. —The transverse length of the shoe press belt = depends on the machine width of the application and can be, for example, 1.5 to 12.6 m.
    The shoe press belt 10 - comprises - a dewatering groove 50, 50a, 50b on the outer surface of the shoe press belt 12. The dewatering groove 50, 50a, 50b of the shoe press belt 1 is shown in particular in Figures 2a, 2b, 3a and 3b.
    When the fibrous web 8 is conveyed through the pressing zone 4 formed by the counter roll 3 and the press shoe 2, water is pressed out of it.
    Typically, at least a portion of said water passes through a paper machine fabric, such as a press felt 6 - into the drainage grooves 50, 50a, 50b on the outer surface 12 of the shoe press belt 10.
    The purpose of the dewatering grooves 50, 50a, 50b is to enhance the transfer of water from the fibrous web 8 to be dried by means of a shoe press belt 10 and thus to increase the dry matter content of said fibrous web 8.
    Most preferably, the shoe press belt 10 comprises a plurality of parallel dewatering grooves 50, 50a, 50b on the outer surface 12 of said shoe press belt 10. The dewatering grooves 50, 50a, 50b are preferably so-called endless and substantially conforming to the first direction D1 of the shoe press belt 10, i.e., in use, substantially conforming to the direction of rotation of the shoe press belt 10.
    That is, in use, the shoe press belt 10 is adapted or intended to be = adapted to an object, such as a press section, N of a paper machine, so that said dewatering grooves 50, 50b, 50c at O are preferably in line with the direction of travel of the fibrous web. a machine direction MD, or at least substantially machine direction.
    The angle of the dewatering grooves I 30 with respect to the first direction, i.e. the direction of rotation c of the shoe press belt, is preferably at most 2 ", such as 0-2 °, more preferably 3 at most 1" and most preferably at most 0.5 ", such as 0.0-0.5". In this case, the dewatering 3 can be particularly efficient, especially when using the auxiliary grooves of the N dewatering grooves.
    The dewatering grooves 50, 50a, 50b may be separate grooves running around the shoe press belt 10, or they may be continuous helical grooves. Also, the angle of the helical dewatering grooves with the first direction, i.e. the direction of rotation of the shoe press belt, is preferably at most 2 °, - such as 0-2 *, more preferably at most 1 ° and most preferably at most 0.5 , such as 0.0-0.5 *, because then the dewatering can be particularly effective, especially when using drainage groove auxiliary grooves. Each dewatering groove 50, 50a, 50b of the shoe press belt 10 comprises - a first wall 60 of a dewatering groove 50, 50a, 50b, a second wall 70 of a dewatering groove, and a bottom 80 of a dewatering groove. Between two adjacent dewatering grooves 50a, 50b there is a base 53 having a width 53b. In addition, the distance 54 between the center lines of two adjacent drainage grooves 50a, 50b can be determined.
    The depth 52 of the dewatering groove 50, 50a, 50b is preferably at least 0.4 mm, more preferably at least 0.7 mm and most preferably at least 1.0 mm, and preferably at most 2.0 mm, more preferably at most 1.7 mm and most preferably at most 1.5 mm measured from the deepest point of the drainage groove. The width 51 of the dewatering groove 50, 50a, 50b is preferably at least 0.5 mm, more preferably at least 0.7 mm and most preferably at least 0.8 mm, and preferably at most 2.0 mm, more preferably at most 1.8 mm and most preferably at most 16 mm. The distance 54 between the center lines of two parallel adjacent drainage grooves 50a, 50b is preferably at least 1.5 mm, more preferably at least 1.8 mm, and most preferably at least 2.0 mm, and preferably at most 7.0 mm, more preferably = at most 6.0 mm and preferably not more than 4.5 mm. The width 53b of the base 53 between the two dewatering grooves N 50a, 50b is preferably at least 1.0 mm, more preferably at least 1.1 mm and most preferably at least 1.2 mm, and preferably at most 5.0 mm, more preferably at most 3.5 mm and preferably not more than 2.5 I 30 mm. The total water volume c of the dewatering channels 50, 50a, 50b is suitably between 100 and 800 g / m more preferably between 200 and 700 g / m and 3 preferably between 300 and 600 g / m The water volume of the outer surface 3 of the shoe press belt is affected by the cross-sectional area of the dewatering grooves and the density of the N dewatering grooves (pcs / m in the transverse direction). The dewatering grooves 50, 50a, - 50b are preferably at least 140 pcs / m, more preferably at least 200 pcs / m and most preferably at least 230 pcs / m, and preferably at most 670 pcs / m,
    more preferably at most 560 pcs / m, and most preferably at most 500 pcs / m in the second direction, i.e. in the transverse direction. With the above-mentioned features of the dewatering groove 50, 50a, 50b (depth, width, - distance between the - center lines, base = width, = water volume, number of dewatering grooves), water can be removed from the web more efficiently through said dewatering groove 50, 50a, 50b. In addition, such a structure may have features that are well compatible with the press felt. These advantages are typically better realized the more of the above-mentioned features are realized in the shoe press belt 10. In addition, a drainage groove such as the one mentioned above can work particularly well with the drainage groove wall auxiliary grooves 100, 100a, 100b (shown in Figures 4a-4c and 5a-5b, for example). , which can have the effect of clearly improving the production efficiency of a machine, such as a paper machine or a board machine.
    The drainage groove 50, 50a, 50b is preferably shaped so as to have an upwardly opening, substantially U-shaped or V-shaped cross-section. The rounded and / or chamfered shape of the base 80 of the dewatering groove 50, 50a, 50b can substantially improve the in-service durability of the dewatering groove 50, 50a, 50b and improve the dewatering properties. In addition, the auxiliary grooves 100, 100a, 100b of the dewatering groove 50 can function particularly well with such shapes of the dewatering groove 50, 50a, 50b. The shoe press belt 10 preferably has a support structure 20, preferably a support structure formed by yarns. Figures 3a and 3b show a support structure 20 according to an example = comprising a first layer 21 of a support structure N formed by yarns, a second layer 22 of a support structure 22 and a third layer 23 of an support structure O. The support structure 20a formed by the yarns is preferably formed with several support wires arranged. - inside said elastic body. The support wires are preferably arranged in one, c two, three or four layers inside the elastic body. S Preferably, at least one, for example one or two, support wire layer (s) 21,23 3 are arranged inside the elastic body in the first direction. In addition, N preferably at least one, for example one or two, support wire layer (s) 22 is - arranged inside the elastic body in the other direction, i.e. in the transverse direction. Preferably, there are a total of three support wire layers 21, 22, 23. The yarns in the different layers may be either in contact or bonded to the yarns in the next layer, or they may be spaced apart. Most preferably, the overlapping support wire layers 21, 22, 23 are separate from each other.
    Said support yarns may be separate yarns adjacent to each other, or they may be formed of one or more yarns arranged in parallel in a spiral. Adjacent support wires of one support wire layer 21, 22, 23 may be at a distance of, for example, 1-3 mm from each other, so that the area between the support wires is preferably of elastic body material. The support wires can be the same thickness or different thicknesses. The thickness of the support wires can be, for example, 0.2-2.0 mm. The support wires of the shoe press belt support structure 20 may be made of the same material or of different materials. Most preferably, the yarns comprise - multifilament - and / or multifilament yarns. Most preferably - the support structure of the shoe press belt comprises yarns formed of a polymer, most preferably polyamide (PA), polypropylene (PP), polyethylene (PE), polyester (PET), polyvinyl alcohol (PVA, PVOH), polyaramide, polyphenylene sulfide (PPS), liquidide polyethylene naphthalate (PEN) and / or polyether ether ketone (PEEK).
    The shoe press belt 10 comprises auxiliary grooves 100, 100a, 100b in the wall 60,70 of the dewatering groove 50, 50a, 50b. The auxiliary grooves 100, 100a, 100b of the dewatering groove 50, 50a, 50b of the shoe press belt 10 are shown in particular in Figs. 4a to 4c and Figs. 5a to 5b. Figures 4a-4c show the wall 60,> 70 70 of the dewatering groove 50, 50a, 50b with auxiliary grooves 100, 100a, 100b. Figures 5a-5b illustrate> a possible groove structure of the auxiliary grooves 100, 100a, 100b. Figure 5a shows <an example of Va in Figure 2b, and Figure 5b shows an example of Figure 2b from Vb.
    N = 30 - Auxiliary grooves 100, 100a, 100b are preferably placed in the shoe press belt 10 O so that the first wall 60 of the dewatering groove 50, 50a, 50b comprises 3 auxiliary grooves 100, 100a, 100b of the dewatering groove. Preferably, the second wall 70 of the drainage grooves 2 also comprises said drainage groove auxiliary grooves 100, 100a, 100b.
    In this application, the auxiliary grooves 100 of the dewatering groove 50, 50a, 50b of the shoe press belt 10 mean grooves in the first wall 60 and / or the second wall 70 of the dewatering groove 50, 50a, 50b, which are clearly smaller than the dewatering groove 50, 50a, 50b. The auxiliary groove 100, 100a, 100b of the dewatering groove 50, 50a, 50b has a first wall 108, a second wall 109, and a base 104 between the walls 108,109. In addition, the width 101, length 103, and depth 102 of the auxiliary groove 100, 100a, 100b can be determined. , and a base 105 between two adjacent drainage groove auxiliary grooves 100a, 100b and a width 105b of said base and a distance 106 between the centerlines of two adjacent drainage groove auxiliary grooves 100a, 100b. The depth 102 of the drainage groove auxiliary groove 100, 100a, 100b may be at least 0 , 1%, more preferably at least 03% and most preferably at least 0.5% of the depth 52 of the drainage groove 50, 50a, 50b. In addition, the depth 102 of the drainage groove auxiliary groove 100, 100a, 100b may be up to 6.5%, more preferably up to 4.0% and most preferably not more than 2.5% of the depth 52 of the dewatering groove 50, 50a, 50b. The width 101 of the dewatering groove auxiliary groove 100, 100a, 100b may be at least 0.1%, more preferably at least 0.3% and most preferably at least 0.5% of the dewatering groove 50 , 50a, 50b widths In addition, the width 101 of the auxiliary groove 100, 100a, 100b of the dewatering groove may be at most 6.5%, more preferably at most 4.0% and most preferably at most 2.5% of the width 51 of the dewatering groove 50, 50a, 50b. The distance 106 between the center lines 100, 100a, 100b is preferably at least 1 mm, more preferably at least 1.3 mm and most preferably at least 1.5 mm, and preferably at most 5 mm, and more preferably at most 4.5 mm and most preferably at most 4.0 mm.
    S O Due to the properties of said auxiliary grooves 100, 100a, 100b (depth, width, distance between the center lines), the dewatering properties of the shoe press belt 10 can be substantially improved. In addition, a shoe press belt 10, c 30 having said auxiliary grooves 100, 100a, 100b can help to substantially improve the surface smoothness properties of the product (fibrous web) to be manufactured. 3 As a result, the properties of the fibrous web 8 to be produced can be better than usual for post-processing, which can help to achieve better properties of the final product, such as a better coating result of the fibrous web 8 or a calendering result. In addition, the shoe press belt 10 comprising said auxiliary grooves 100, 100a, 100b can help to achieve the desired properties of the fibrous web 8 to be manufactured, which can be, for example, improved bulk properties and / or a good moisture profile.
    The total amount of water volume (g / m 2) of the auxiliary grooves 100, 100a, 100b of the dewatering groove is suitably at least 0.1%, more preferably at least 0.3% and most preferably at least 0.5% of the total amount of water volume of the dewatering grooves 50, 50a, 50b. In addition, the total amount of water volume of the auxiliary groove 100, 100a, 100b of the dewatering groove is suitably not more than 6.5%, more preferably not more than 4.0% and most preferably not more than 2.5% of the total volume of water of the dewatering groove 50, 50a, 50b. In this case - it is possible - to achieve - as possible = efficient - dewaterable drying of the fibrous web 8. The water volume of said dewatering groove wall 60, 70 - auxiliary grooves 100, 100a, 100b is affected by the cross-sectional area of said auxiliary grooves 100, 100a, 100b and said auxiliary grooves density in said wall (pcs / m in the longitudinal direction of the wall 60, 70 of the drainage groove).
    The depth 102 of the auxiliary groove 100, 100a, 100b in the wall 60,70 of the dewatering groove 50, 50a, 50b may preferably be at least 8 μm, more preferably at least 10 μm and most preferably at least 15 μm, and preferably at most 110 μm, more preferably at most 80 μm, and most preferably up to 50 μm. The width 101 of the auxiliary groove 100, 100a, 100b of the dewatering groove wall is then> 25 - preferably at least 6 μm, more preferably at least 10 μm, and preferably> at most 110 μm, more preferably at most 80 μm, and most preferably at most 50 μm. With said characteristics of the auxiliary groove 7 of the wall 60,70 of the dewatering groove 50, 50a, 50b, the dewatering properties of the shoe press belt 10 can be substantially improved. E 30 O The auxiliary grooves 100, 100a, 100b in the wall 60,70 of the dewatering groove 50, 50a, 50b are 3 preferably substantially parallel, i.e. the auxiliary grooves 100, 100a, 100b or at least most of the auxiliary grooves in one of the 2 walls of one dewatering groove are N is preferably at an angle of less than 15 degrees to each other, more preferably at an angle of less than 5 degrees to each other, and most preferably at an angle of less than 2 degrees to each other. In this case, the dewatering groove can be emptied more precisely than before and / or water can be drained from the web to the dewatering groove more efficiently in the past, both of which help to increase the dry matter content of the fibrous web 8 to be manufactured. That is, the auxiliary grooves 100, 100a, 100b of the dewatering groove allow the water to drain out of the dewatering groove 50, 50a, 50b more efficiently, resulting in less back-wetting with respect to the felt or web. The wall 60,70 of the dewatering groove 50, 50a, 50b having the auxiliary grooves 100, 100a, 100b of the dewatering groove - wall 60.70 is preferably at an angle B of 25 to 25 degrees to the normal of the surface of the shoe press belt 10 (shown in Fig. 2b), more preferably the dewatering groove 50, The wall 60,70 of 50a, 50b is at an angle of at least 5 degrees and preferably at least 10 degrees B to the normal of the inner surface 11 of the shoe press belt 10, and more preferably at an angle of not more than 20 degrees and most preferably not more than 15 degrees to the normal of the inner surface 11 of the shoe press belt 10. In this case, the effect of the auxiliary grooves 100, 100a, 100b for drying the fibrous web can be enhanced. The auxiliary groove 100, 100a, 100b in the wall 60,70 of the dewatering groove 50, 50a, 50b may be at an angle α of at least 5 °, more preferably at an angle α of at least 6 °, and most preferably at an angle α of at least 7 ° with respect to the bottom of said dewatering groove 50, 50a, 50b . In addition, the auxiliary groove 100, 100a, 100b in the wall 60,70 of the dewatering groove 50, 50a, 50b may be at an angle α of at most 30 *, more preferably at an angle α of at most 27 ", and most preferably at an angle α of at most 23" with respect to said drainage groove 50, 50a, 50b. relative to the bottom. In this case, the orientation of the auxiliary grooves = 100, 100a, 100b may be particularly suitable for dewatering N fibrous webs so that water can be effectively removed from the fibrous web O by means of a shoe press belt.
    N I 30 - In order to enhance the advantageous effects, one dewatering groove preferably comprises at least 200 said auxiliary grooves per 100 meters. The auxiliary grooves 100, 100a, 100b in the wall 60, 70 of the dewatering groove 3 are preferably in the walls 60, 70 of one dewatering groove 3 preferably at least 200 pcs / m, more preferably at least N 230 pcs / m and most preferably at least 250 pcs / m. In addition, the auxiliary grooves 100, 100a, 100b of the dewatering groove wall 60, 70 are preferably in the walls 60, 70 of one dewatering groove preferably at most 1000 pieces / m, more preferably at most 800 pieces / m, and most preferably at most 670 pieces / m in the longitudinal direction of said wall 60, 70, i.e. seen in the longitudinal direction of the dewatering groove 50, 50a, 50b.
    By fulfilling the above-mentioned advantageous features of the auxiliary grooves 100, 100a, 100b, a more efficient water transfer from the fibrous web 8 to the dewatering grooves 50, 50a, 50b and / or the dewatering grooves 50, 50a, 50b can be achieved with the dewatering groove auxiliary grooves 100, 100a, 50b. drainage out of the drainage circuit. The more water is obtained from the fibrous web 8 - the water removed to the dewatering groove 50, 50a, 50b of the shoe press belt 10, the higher the dry matter content of the fibrous web 8 can be achieved. In addition, the more efficiently the water accumulated in the dewatering channel is removed from the dewatering channel before being refilled with water, the higher the dewatering and the dry matter content of the fibrous web 8 can be achieved. Higher - dewatering capacity can substantially improve the runnability of an entire web making machine, such as a paper machine, board machine, or pulp dryer, and improve the production efficiency of that machine. The auxiliary groove 100, 100a, 100b of the dewatering groove preferably has a slightly curved shape so that the radius of curvature 100R of the auxiliary groove may be at least 10 mm, more preferably at least 30 mm and most preferably at least 45 mm. In addition, the radius of curvature 100R of the auxiliary groove is preferably at most 250 mm, more preferably at most 150 mm and most preferably at most 100 mm. The slight curvature of the auxiliary groove (shown in Figure 4b) can help the water to escape from the shoe press belt - instead of the tangent direction of the surface towards the normal of the surface.
    <Due to the auxiliary grooves 100, 100a, 100b in the wall of the dewatering groove, the flow of water transferred to the dewatering groove 50, 50a, 50b in the dewatering groove N typically slows down as much as in prior art shoe press belts 10, but the speed of water in the dewatering groove O remains fast. the dewatering groove becomes more efficient.
    3 5 Auxiliary grooves in the wall of the dewatering groove can be particularly useful in N shoe press belts comprising a polyurethane polymer. Therefore, preferably at least 50% by weight, more preferably at least 70% by weight
    % and most preferably at least 80% by weight of the shoe press belt is polyurethane. For example, the polyurethane may be up to 99.9% by weight and more preferably up to 95% by weight of the shoe press belt.
    —Auxiliary grooves 100, 100a, 100b in the walls 60,70 of the dewatering grooves 50, 50a, 50b of the shoe press belt 10 can increase the dewatering efficiency of the press section of a machine, such as a paper, board or pulp dryer, and thus the production efficiency = especially when used in the first direction. or in connection with the dewatering grooves 50, 50a, 50b substantially in the first direction. Therefore, the shoe press belt 10 preferably comprises at least first direction or substantially first direction (machine direction) drainage grooves comprising auxiliary grooves 100, 100a, 100b in the wall 60,70 of the drainage groove 50, 50a, 50b. Auxiliary grooves for dewatering grooves can be made, for example, by means of laser technology.
    The thickness 10a of the shoe press belt 10 comprising the auxiliary grooves 100, 100a, 100b of the wall of the dewatering groove, measured from the thickest part of the belt, is preferably 3 to 6 mm.
    The shoe press belt 10 may also comprise grooves other than said machine direction or substantially machine direction dewatering grooves. The shoe press belt 10 may comprise, for example, transverse CDs or substantially transverse grooves. The shoe press belt 10 may also comprise grooves arranged diagonally or substantially diagonally.
    The essential idea of a preferred embodiment is that the outer surface of the shoe press belt O has only one-way endless drainage grooves, as well as parallel heels x 30 - between said one-way endless grooves.
    The shoe press belt is intended to be mounted in connection with a shoe press N of a machine, such as a pulp drying machine, a cardboard machine or a paper machine, most preferably on a press part. The shoe press may be provided with - a variety of devices known to those skilled in the art, such as one or more water collecting devices for removing water from the press felt associated with the shoe press and / or water collecting troughs and / or scrapers and / or other means for removing water from shoe press belt grooves. In addition, the press section typically comprises a variety of devices known to those skilled in the art.
    The installation direction of the shoe press belt 10 can affect the efficiency and operation of the auxiliary grooves 100, 100a, 100b of the shoe press belt 10, and thereby also the efficiency and operation of the shoe press belt 10.
    The shoe press belt 10 can be mounted or is intended to be mounted in the first = and / or second mounting direction. In the first installation direction, in particular, the collection of water from the web to the dewatering groove 50, 50a, 50b can be facilitated. In said first mounting direction - (shown in Fig. 4a) the wall auxiliary grooves 100, 100a, 100b form an angle w of less than 90 ° with respect to the direction of rotation D1 of the shoe press belt, and can efficiently guide water to the dewatering groove 50. In this case, the auxiliary grooves can in particular promote water collection . The first installation direction can be particularly advantageous when used - the shoe press belt 10 at the beginning of the press section, whereby the amount of water in the fibrous web 8 is typically reasonably large. According to one example, the angle w of the auxiliary groove of the shoe press belt in the first - installation direction = relative to - the shoe press belt - direction of rotation D1 can be determined from the equation oO N w = a> N In the second - installation direction (shown - Fig. 4b) especially I 30 - dewatering groove 50, 50a, 50b the removal of water from the dewatering groove c 50, 50a, 50b can be facilitated. In the second installation direction, the auxiliary grooves S 100 of the wall form an angle w of more than 90 ° with respect to the direction of rotation D1 of the shoe press belt 3. In this case, the auxiliary grooves can in particular assist the removal of water N from the dewatering groove 50, 50a, 50b and can thus enhance the removal of water collected in the dewatering groove from the connection of the shoe press belt 10. Such a solution is particularly advantageous when using a shoe press belt 10 towards the end of the press section, whereby the dry matter content of the fibrous web 8 has already been increased.
    According to one example, the angle w of the auxiliary groove of the shoe press belt in the second installation direction can be determined from the equation w = 180-a.
    That is, the angle α, which describes the inclination of the auxiliary groove 100 with respect to the bottom of the dewatering groove 50, 50a, 50b, is not dependent - the direction of rotation of the shoe press belt, i.e. the mounting direction, while the angle w is determined by the mounting direction of the product.
    The angle a can be determined if the angle w is known.
    In this case, in the first installation direction a = w and in the second installation direction, the angle α can be calculated from the formula a = 180 - w Preferably, a machine such as a pulp dryer, paper or board machine on which a shoe press belt 10 with dewatering groove wall guides 100, 100a, 100b is mounted includes two said shoe press belt 10, one mounted in the first mounting direction and the other in the second mounting direction.
    In this case, in the direction of travel of the web, the first shoe press belt 10 is preferably mounted = so that the auxiliary grooves 100, 100a, 100b of the dewatering groove facilitate the removal of water N from the dewatering groove 50, 50a, 50b.
    In addition, in the direction of travel O of the machine, the latter shoe press belt 10 is preferably mounted so that the auxiliary grooves 100 in the wall of the drainage groove 50 assist in the movement of water towards the drainage groove I 30.
    Such a system comprising two shoe presses c and two shoe press belts 10 comprising dewatering groove auxiliary grooves 100, 100a, 100b 3 can have particularly advantageous effects on the drying capacity of a machine 3, such as a paper, pulp dryer, or board machine, N press section, and thus to improve machine production efficiency.
    As discussed above, the auxiliary grooves in the wall of the dewatering groove can have several beneficial effects on the operation of the shoe press belt. For example, they can enhance the drainage of water, which can help to increase the web speed as well as the production efficiency with a machine that includes the auxiliary grooves in the wall of the drainage groove as shown. The features presented in this application are not separate independent examples, but can be combined into different combinations. The drawings and the related description are intended - to illustrate the idea of the invention, but it will be apparent to a person skilled in the art that the basic idea of the invention can be implemented in many different ways. The invention and its embodiments are thus not limited to the examples described above, but may vary within the scope of the claims.
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    权利要求:
    Claims (15)
    [1]
    A shoe press belt (10), which is an endless loop-shaped body having an inner surface (11) and an outer surface (12), and which shoe press belt (10) comprises: - an elastomeric body, and - an elastomeric body support structure (20, 21, 22). 23), the elastomeric body comprising: - a plurality of parallel dewatering grooves (50, 50a, 50b) on the outer surface (12) of the shoe press belt (10), with a base (53) and at least a first of said dewatering grooves (50) between two adjacent dewatering grooves (50a, 50b); , 50a, 50b) comprises - a first wall (60) of the drainage groove (50, 50a, 50b), - a second wall (70) of the drainage groove (50, 50a, 50b), and - a bottom (80) of the drainage groove = (50, 50a, 50b) ) between the first wall (60) and the second wall (70) of the drainage groove, characterized in that the first wall (60) of the drainage groove (50, 50a, 50b) comprises a plurality of parallel drainage groove auxiliary grooves (100, 100a, 100b) which preferably extend on the outer surface (12) of the shoe press belt (10).
    =
    [2]
    Shoe press belt (10) according to claim 1, characterized in that said second wall (70) of the dewatering groove (50) comprises O a plurality of parallel dewatering groove auxiliary grooves (100, 100a, 100b) extending on the outer surface (s) of the shoe press belt (10). 12). I 30 o
    [3]
    Shoe press belt according to any one of the preceding claims, characterized in that said auxiliary grooves (100, 100a, 3100b) of the dewatering groove (50) are at least 200 pieces / m measured from one dewatering groove N in the longitudinal direction of said dewatering groove.
    [4]
    Shoe press belt according to one of the preceding claims, characterized in that at least one auxiliary groove (100,
    100a, 100b) have a slightly curved shape such that the radius of curvature (100R) of said at least one auxiliary groove is at least 10 mm.
    [5]
    Shoe press belt according to one of the preceding claims, characterized in that the shoe press belt (10) comprises at least 140 / m of dewatering grooves (50, 50a, 50b) whose walls contain auxiliary grooves (100) measured transversely to the direction of rotation of said shoe press belt (10). , 100a, 100b) extending to the outer surface (12) of the shoe press belt (10).
    [6]
    Shoe press belt according to any one of the preceding claims, characterized in that said plurality of parallel drainage groove auxiliary grooves (100, 100a, 100b) are arranged so that each auxiliary groove extends in a direction forming an angle α of at least 5 * with respect to said drainage groove (50). , 50a, 50b) relative to the bottom.
    [7]
    Shoe press belt according to one of the preceding claims, characterized in that the width (101) of the auxiliary groove (100, 100a, 100b) of the dewatering groove (50, 50a, 50b) is at least 0.1% and at most 6.5%, the width of the dewatering groove 50, 50a, 50b.
    [8]
    Shoe press belt according to one of the preceding claims, characterized in that the depth (102) of the auxiliary groove (100, 100a, 100b) of the dewatering groove (50, 50a, 50b) is - at least 0.1% and at most 65%, the depth of the dewatering groove 50, 50a , From a depth of 50b. oO N
    [9]
    Shoe press belt according to one of the preceding claims, characterized in that the dimension (107) of the auxiliary groove (100, a 100a, 100b) of the dewatering groove (50, 50a, 50b) in the depth direction 30 of the dewatering groove (50, 50a, 50b) is at least 60 % relative to the depth of the drainage groove (50, c 50a, 50b) (52). = o
    [10]
    Shoe press belt, N according to one of the preceding claims, characterized in that the distance (106) between the center lines of the auxiliary grooves of two adjacent dewatering grooves is at least 1 mm and at most 5 mm.
    [11]
    Shoe press belt according to one of the preceding claims, characterized in that the depth (52) of the first dewatering groove (50, 50a, 50b) is at least 0.4 mm and preferably at most 2.0 mm.
    [12]
    Shoe press belt according to any one of the preceding claims, characterized in that said plurality of dewatering grooves (50, 50a, 50b) substantially correspond to the direction of rotation (D1) of said shoe press belt (10).
    [13]
    Shoe press belt according to any one of the preceding claims, characterized in that said elastomeric body contains at least 50% by weight, preferably at least 70% by weight of polyurethane.
    [14]
    A paper machine, board machine or pulp dryer comprising at least one shoe press belt (10) according to the preceding claim.
    [15]
    A method of mounting a shoe press belt on a paper, pulp dryer or board machine, the method comprising - making available - a shoe press belt according to any one of claims 1 to 13, and - installing = said - a shoe press belt - in connection with a shoe press.
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    类似技术:
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    同族专利:
    公开号 | 公开日
    US20210340707A1|2021-11-04|
    JP2022514183A|2022-02-10|
    FI128550B|2020-07-31|
    EP3914769A1|2021-12-01|
    WO2020152392A1|2020-07-30|
    CN113167026A|2021-07-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19722638A1|1997-05-30|1998-12-03|Voith Sulzer Papiermasch Gmbh|Press jacket for a press device|
    US7144480B2|2003-04-17|2006-12-05|Albany International Corp.|Grooved belt with rebates|
    FI118227B|2005-10-14|2007-08-31|Tamfelt Oyj Abp|Press belts|
    法律状态:
    2020-07-31| FG| Patent granted|Ref document number: 128550 Country of ref document: FI Kind code of ref document: B |
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