with

Abstract

The present invention relates to a bushing roll belt (10) comprising an inner surface (11) and an outer surface (12), the belt comprising a body (15) and a reinforcing structure (30), wherein the reinforcing structure (30) comprises a plurality of first yarns (31) arranged in a first direction (D1) of the belt and a plurality of second yarns (32) arranged in a second direction (D2) of the belt, wherein the reinforcing structure (30) further comprises a plurality of auxiliary yarns (31b, 31c) which are arranged parallel or substantially parallel to the first direction (D1) of the belt, and wherein, measured in the depth direction of the belt from the outer surface (12) of the body (15) to the outer surface (31-o, 31b-o) of each yarn (31, 31b, 31c), these auxiliary yarns are arranged at a greater depth than the depth of the first yarns, and the diameter of these auxiliary yarns is at least 20% smaller than the diameter of the first yarns.

Description

Technical Field

[0001] The present invention relates to a sleeve roll belt. The present invention relates to an apparatus that includes a sleeve roll belt on a sleeve roll. Background Art

[0002] Paper machines, board machines, pulping machines, and tissue machines are typically equipped with a forming section, a pressing section, and a drying section. In papermaking, pulping, and board manufacturing, how to increase the water removal rate from the wet fiber web to improve production efficiency is an important issue.

[0003] Currently, these machines typically have felts and meshes to remove water from the fiber web. For example, water can be removed on the forming section through at least one forming mesh.

[0004] For example, sleeve rolls can be used in the forming section to improve water removal from the web. The sleeve roll needs to have a sleeve roll belt. However, it is challenging to obtain a belt that can operate well with the sleeve roll. Summary of the Invention

[0005] The present invention discloses a novel belt for a sleeve roll. A novel apparatus includes a belt on a sleeve roll.

[0006] The object of the present invention is to provide an improved belt for a sleeve roll.

[0007] The sleeve roll is typically located in the wire section of a paper machine, board machine, pulping machine, or tissue machine. Due to the sleeve roll, the water removal in the wire section can be improved.

[0008] The belt according to this specification, i.e., the sleeve roll belt, is suitable for the sleeve roll of a paper machine, board machine, pulping machine, or tissue machine.

[0009] The structure of a sleeve roll having a curve element on its outer surface is different from, for example, the structure of a shoe press. Therefore, the performance required for the sleeve roll belt is different from the performance required for, for example, a shoe press belt. For example, a shoe press belt must be able to withstand the stress caused by the long press zone of the shoe press. Due to the sharp deflection when entering and leaving the press zone, the long press zone of the shoe press generates high stress on the belt. The sleeve roll does not have the long press zone; therefore, the sleeve roll belt does not need to handle this stress. However, the sleeve roll belt must have suitable performance to handle the stress caused by the curve element of the sleeve roll. A belt for a shoe press cannot operate properly with a sleeve roll. Therefore, an improved belt suitable for a sleeve roll is needed.

[0010] Bending elements, especially movable bending elements, usually cause a speed difference between the belt and the mesh in contact with the belt. This speed difference is very problematic because the belt and the mesh may wear out too quickly. By controlling the position and properties of the yarns, the speed difference can be minimized so that the position of the neutral axis is close to the outer surface of the belt. However, simply shifting the neutral axis of the belt may cause new problems. The yarns near the outer surface of the belt may be more easily damaged than the yarns near the inner surface of the belt. If the yarns near the outer surface are damaged, the strength of the belt may decrease in an uncontrolled manner, which may cause unexpected downtime for the machine. Therefore, by controlling the position of the neutral axis of the belt and the strength properties of the belt during use, the production efficiency of the machine can be significantly improved.

[0011] The position of the neutral axis can depend on the reinforcement structure, and especially on the yarns arranged substantially in the running direction of the belt. The speed of the belt at the position of the first yarn can be controlled to be substantially the same as the speed of the mesh. However, the speed of the belt on the outer surface of the belt is usually different from the speed of the mesh. To minimize this speed difference, the first yarn can be arranged close to the outer surface of the belt. However, this may cause additional problems because the yarns near the outer surface of the belt may be damaged due to the wear of the belt. Thus, it may be necessary to replace the belt with a new one too frequently, which increases the total cost of the belt.

[0012] The inventors of the present invention have surprisingly found that it is feasible to use auxiliary yarns together with the first yarns. Due to the auxiliary yarns, even if the first yarns are damaged, the strength of the belt can still be maintained at an acceptable level, and at the same time the auxiliary yarns do not have too much influence on the position of the neutral axis of the belt. Therefore, the wear level of the belt (and the mesh) can be maintained at a suitable level.

[0013] The belt for the bushing roll can include an inner surface and an outer surface. In use, the outer surface can face the fibrous web. In use, the inner surface can face the bushing roll.

[0014] The belt can include a body and a reinforcement structure, and the body is preferably an elastic body. The reinforcement structure can be a support structure for supporting the elastic body.

[0015] The reinforcement structure can include a first yarn and a second yarn. The first yarn is arranged along a first direction of the belt, and the second yarn is arranged along a second direction of the belt.

[0016] The first direction can be parallel to or substantially parallel to the running direction of the belt.

[0017] The first yarn of the belt is preferably close to the outer surface of the belt. The first yarn can be the outermost yarn closest to the outer surface of the belt. The technical effect is that the neutral axis of the belt can be close to the outer surface of the belt. This can significantly reduce the wear of the belt and give the belt a longer lifespan.

[0018] The second direction can be perpendicular or substantially perpendicular to the first direction. In addition, the second direction can be parallel or substantially parallel to the rotation axis of the belt.

[0019] The reinforcing structure of the belt further includes auxiliary yarns. The auxiliary yarns can be arranged parallel or substantially parallel to the first direction of the belt. In this way, the auxiliary yarns can be arranged parallel or substantially parallel to the first yarns. In addition, the auxiliary yarns can be arranged parallel or substantially parallel to the traveling direction of the belt.

[0020] The auxiliary yarns can be thinner than the first yarns. For example, if the diameter of the auxiliary yarns is smaller than the diameter of the first yarns, the auxiliary yarns can be more flexible than the first yarns. The diameter of the auxiliary yarns can be at least 20% smaller, preferably 30% smaller or more, than the diameter of the first yarns. Thereby, the auxiliary yarns can provide suitable strength for at least a predetermined time, but they do not have a great impact on the neutral axis of the belt. Further, due to the reduced diameter, the auxiliary yarns can be a more cost-effective and environmentally friendly solution.

[0021] The diameter of the first yarns can be in the range between 0.3 mm and 3 mm. In addition, the diameter of the auxiliary yarns can be in the range between 0.1 mm and 1.5 mm, preferably in the range between 0.3 mm and 1.0 mm.

[0022] Measured in the depth direction of the belt from the outer surface of the elastic body to the bottom of the first yarns, the first yarns can be arranged at a depth equal to or less than 3 mm. Thereby, the first yarns of the first yarn layer can be partially or completely arranged inside the elastic body. Thereby, the first yarns can be completely surrounded by the material of the elastic body.

[0023] Advantageously, measured in the depth direction of the belt from the outer surface of the elastic body to the outer surface of each first yarn, the first yarns are arranged at a depth less than 2.0 mm, more preferably equal to or less than 1.5 mm, or equal to or less than 0.8 mm, and most preferably at least 0.5 mm in depth. The technical effect is to make the neutral axis of the belt close to the outer surface of the belt, thereby reducing the wear of the belt. This can give the belt a longer lifespan compared to other belts. In addition, the body material can protect the yarns from damage.

[0024] The auxiliary yarns can be arranged in the belt such that the depth at which the auxiliary yarns are located is at least 10%, preferably at least 20% greater than the depth of the first yarn, where the depth is determined from the outer surface of each yarn in the depth direction of the belt. Thus, even if the first yarn is damaged, the auxiliary yarns can still maintain the strength of the belt in the traveling direction of the belt at an acceptable level. In addition, the diameter of each auxiliary yarn can be smaller than the diameter of each first yarn, so that the degree of wear of the belt (and the net) can be maintained at an appropriate level.

[0025] The auxiliary yarns can be completely surrounded by the material of the body. The auxiliary yarns can be arranged at a depth equal to or less than 2 mm, preferably equal to or less than 1.5 mm, where the depth is measured from the outer surface of the elastic body to the bottom of the auxiliary yarns in the depth direction of the belt. The technical effect is to make the neutral axis of the belt close to the outer surface of the belt, thereby reducing the wear of the belt.

[0026] The auxiliary yarns can be arranged at the same or greater depth as the first yarn, where the depth is measured from the outer surface of the body to the center point of each yarn in the depth direction of the belt.

[0027] Advantageously, the auxiliary yarns are arranged at a depth at least 0.1 mm, more preferably at least 0.3 mm or greater, and most preferably at least 0.5 mm or greater than the depth of the first yarn, where the depth is measured from the outer surface of each first yarn to the outer surface of each auxiliary yarn in the depth direction of the belt. The technical effect is that in use, after the first yarn is damaged, the auxiliary yarns can maintain the strength of the belt at an appropriate level for a longer time. In addition, the auxiliary yarns can be arranged at a depth less than 1.2 mm, more preferably less than 1.0 mm, and most preferably less than 0.8 mm greater than the depth of the first yarn, where the depth is measured from the outer surface of each first yarn to the outer surface of each auxiliary yarn in the depth direction of the belt. The technical effect is to keep the neutral axis of the belt close to the outer surface of the belt, thereby reducing the wear of the belt. This gives the belt a longer life compared to other belts.

[0028] The auxiliary yarns can be arranged at a depth at least 10%, preferably at least 20%, and most preferably at least 30% greater than the depth of the first yarn, where the depth is measured from the outer surface of the elastic body to the outer surface of each yarn in the depth direction of the belt.

[0029] Advantageously, the depth at which the auxiliary yarns are arranged depends on the diameter of the first yarns. The depth difference between each first yarn and each auxiliary yarn can range between 30% and 100% of the diameter of the first yarn, preferably between 40% and 90% of the diameter of the first yarn, and more preferably between 40% and 80% of the diameter of the first yarn, where the depth difference is determined in the depth direction of the belt from the outer surface of each first yarn to the outer surface of each auxiliary yarn. The technical effect is that in use, after the first yarn is damaged, the auxiliary yarns can maintain the strength of the belt at an appropriate level. In addition, the neutral axis can be kept close to the outer surface of the belt, thereby reducing the wear of the belt. This gives the belt a longer life compared to other belts.

[0030] Measured in a direction perpendicular to the direction of the auxiliary yarns, the number of auxiliary yarns can range between 200 yarns / m (meter) and 800 yarns / m. The number of auxiliary yarns per meter can be 0.5 to 3 times the number of first yarns per meter, preferably 1 to 2 times the number of first yarns per meter. Thus, even after the first yarns are damaged, the belt can still have good stretch characteristics and strength characteristics for the bushing roller.

[0031] The auxiliary yarns can be arranged such that, in the absence of the first yarns, they provide a breaking strength of equal to or greater than 50 kN / m measured in the direction of travel of the belt. The technical effect is that even after the first yarns break, the belt can still have an appropriate strength for the bushing roller in the direction of travel of the bushing roller belt.

[0032] Thus, measured in the direction of travel of the belt in the absence of the first yarns, the belt can have a breaking strength of equal to or greater than 50 kN / m, preferably in the range between 70 kN / m and 200 kN / m.

[0033] The auxiliary yarns can comprise at least one of the following materials or consist of at least one of the following materials:

[0034] Polyamide (PA);

[0035] Aramid;

[0036] Rayon;

[0037] Polyester fiber, preferably polyethylene terephthalate (PET);

[0038] Polyethylene naphthalate (PEN); and

[0039] Carbon / thermoplastic composite.

[0040] These materials can be used to provide sufficient strength characteristics and dimensional stability to the auxiliary yarn. Preferably, the auxiliary yarn comprises or consists of polyester fibers, preferably polyethylene terephthalate (PET). Thereby, the dimensional stability of the auxiliary yarn can be at an improved level.

[0041] For environmental protection reasons, the auxiliary yarn can comprise or be made of one or more biopolymers. Alternatively or additionally, the auxiliary yarn can comprise or be made of one or more recyclable polymers.

[0042] The bushing roller belt can be arranged to have at least one of the following characteristics, preferably at least two, and most preferably all:

[0043] The belt is configured to elastically stretch by at least 1.5% in the traveling direction of the belt, preferably elastically stretch in the range between 1.8% and 3.0% in the traveling direction of the belt, so that after the pulling force for stretching the belt is removed, the belt will return to its original length;

[0044] The load (LASE2%) at a specific elongation of 2% in the traveling direction of the belt is equal to or greater than 28 kN / m and preferably equal to or less than 50 kN / m;

[0045] The load (LASE 4%) at a specific elongation of 4% in the traveling direction of the belt is equal to or greater than 49 kN / m and preferably equal to or less than 80 kN / m;

[0046] The belt is configured such that after the load of 25 kN / m for stretching the belt in the traveling direction of the belt is removed, the belt returns to its original length. Preferably, the belt is configured such that after the load of 30 kN / m for stretching the belt in the traveling direction of the belt is removed, the belt returns to its original length; and

[0047] Measured at 20 °C in the traveling direction of the belt, the tensile elongation at break of the belt is equal to or greater than 20%, such as between 20% and 25%.

[0048] Thereby, the belt can have characteristics for the lifting of the bushing roller.

[0049] By means of this novel solution, an improved bushing roller belt can be obtained. This novel reinforcing structure includes an auxiliary yarn, which can be finer than the first yarn.

[0050] This novel bushing roll belt can still have appropriate strength even when the first yarn has broken. In addition, the neutral axis of the belt can be close to the outer surface of the belt. Therefore, the wear of the belt can be reduced. In addition, since the speed difference between the belt and the mesh in contact with the belt can be reduced, the wear of the mesh can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be illustrated below with reference to the accompanying drawings, in which:

[0052] Figures 1a to 1b Multiple examples of bushing rolls are illustrated;

[0053] Figure 2 An example of a belt is shown;

[0054] Figure 3a 、 Figure 3b 、 Figure 3c 、 Figure 3d Some examples for internal structures are illustrated; and

[0055] Figure 4 An example of the internal structure of the belt is illustrated.

[0056] These figures are diagrams that may not be drawn to scale. Similar parts are denoted by the same reference numerals in the figures.

[0057] The following reference numerals are used in the present application:

[0058] 10 Belt,

[0059] 11 Inner surface of the belt,

[0060] 12 Outer surface of the belt,

[0061] 15 Body,

[0062] 30 Reinforcing structure,

[0063] 31 First yarn,

[0064] 31b Auxiliary yarn, first auxiliary yarn,

[0065] 31c Auxiliary yarn, second auxiliary yarn,

[0066] 32 Second yarn,

[0067] 31-i Bottom of the first yarn in the depth direction of the belt, i.e., the innermost surface of the first yarn,

[0068] 31-o Outer surface of the first yarn in the depth direction of the belt, i.e., the outermost surface of the first yarn,

[0069] The bottom of the 31b-i auxiliary yarn in the depth direction of the belt, i.e., the innermost surface of the auxiliary yarn

[0070] The outer surface of the 31b-o auxiliary yarn in the depth direction of the belt, i.e., the outermost surface of the auxiliary yarn

[0071] 60 Attachment point of the bushing roll belt

[0072] D1 First direction of the belt

[0073] D2 Second direction of the belt

[0074] MD Travel direction of the belt

[0075] CD Transverse direction of the belt

[0076] 100 Bushing roll

[0077] 102 Support shaft of the bushing roll

[0078] 110 Bending element of the bushing roll

[0079] 110a Surface of the movable bending element in the first position

[0080] 110b Surface of the movable bending element in the second position

[0081] C1 First bending portion of the bushing roll, and

[0082] C2 Second bending portion of the bushing roll Detailed Description

[0083] All embodiments in this application are presented by way of graphical examples and should not be considered restrictive

[0084] Terminology

[0085] In this application, unless otherwise specified, the terms "belt" and "bushing roll belt" both refer to a belt applicable to a bushing roll. The bushing roll belt 10 can be applicable to the bushing roll of a paper machine. The bushing roll belt 10 can be applicable to a board machine, a pulping machine, or a tissue paper machine. The bushing roll belt 10 can be arranged on the bushing roll 100, which can be located, for example, in the wire section of a paper machine, a board machine, a pulping machine, or a tissue paper machine. The bushing roll belt can be used to improve the removal of moisture from the very wet fiber web in the wire section. The bushing roll belt 10 can be an impermeable belt

[0086] In the present application, the term "yarn" refers to a long structure having a relatively small cross-section. The yarn may be composed of twisted or untwisted fibers and / or filaments. The yarn may be a multi-ply yarn. The yarn may be based on one or more man-made polymers. The term "filament" refers to a fiber of very great length.

[0087] The terms "first yarn layer" and "first yarn" refer to those yarns arranged in the first direction.

[0088] The terms "second yarn layer" and "second yarn" refer to those yarns arranged in the second direction.

[0089] Thus, in the present application, the term "first direction" D1 refers to the direction in which the first yarns are arranged. Further, the term "second direction" D2 refers to the direction in which the second yarns are arranged. The first direction is preferably parallel to or substantially parallel to the traveling direction of the belt. The second direction is preferably parallel to or substantially parallel to the transverse direction of the belt.

[0090] The term "traveling direction" MD refers to the direction of rotation of the bushing roll belt in use. The term "transverse direction" CD refers to the longitudinal direction, which is generally transverse to the traveling direction MD of the belt 10. In use, this transverse direction is parallel to the axis of rotation of the bushing roll belt. Thus, the transverse direction refers to the direction parallel to the axis of rotation of the bushing roll belt in use.

[0091] The first yarns may be arranged generally parallel to the traveling direction of the bushing roll belt. The second yarns may be arranged generally parallel to the transverse direction of the bushing roll belt.

[0092] In the present application, the term "substantially parallel" means that a direction does not deviate from the generally parallel direction by more than 10 degrees, more preferably not more than 5 degrees, and most preferably not more than 3 degrees. Thus, for example, "substantially parallel to the traveling direction" in the present application means that a direction does not deviate from the traveling direction by more than 10 degrees, more preferably not more than 5 degrees, and preferably not more than 3 degrees. Further, for example, "substantially parallel to the transverse direction" in the present application means that a direction does not deviate from the transverse direction by more than 10 degrees, more preferably not more than 5 degrees, and preferably not more than 3 degrees.

[0093] In this specification, the term "elasticity" refers to the ability of the belt to return to its initial shape after being stretched or compressed (i.e., after the force is removed). The percentage of elasticity (%) is a value indicating to what extent the belt can be elastically stretched.

[0094] The load at a specific elongation (LASE) refers to the load required to reach a defined elongation, i.e., the load applied for a specific elongation. For example, LASE 2% is defined as the value of the load measured when the elongation is 2%. The load at a specific elongation is determined based on the standard SFS 2983. This value can be determined using the Alwetron TCT 20 device produced by Lorentzen & Wettre AB (Lorentzen & Wettre, Sweden).

[0095] Furthermore, in this technical field, the term EASF is used to refer to the elongation at a specific force. EASF can be used for a similar purpose as LASE, but EASF (elongation at a specific force) is not the same as LASE (load at a specific elongation).

[0096] The breaking strength can be determined based on the standard SFS 2983. This value can be determined using the Alwetron TCT 20 device produced by Lorentzen & Wettre AB (Lorentzen & Wettre, Sweden).

[0097] Furthermore, the term "the thickness of the belt" will be used to refer to the depth direction of the belt.

[0098] Paper machine, board machine, pulping machine and tissue machine

[0099] Generally, in paper machines, board machines, pulp machines, and tissue machines, the fiber web is manufactured and processed in an assembly of several devices that are continuously arranged in a processing line. A typical production line includes a forming section that includes a headbox and a wire, a press section, a drying section, and a final reel. In addition, this production line usually includes, for example, at least one rewinder to form multiple customer rolls.

[0100] In the forming section, a headbox is typically used to form the fiber web. In addition, a portion of the water can be removed through at least one forming wire. The sleeve roll 100 can be located within the forming section to improve water removal in the forming section. The present invention relates to a belt 10 for the sleeve roll 100.

[0101] Bushing roll

[0102] Refer to Figures 1a - 1b , the sleeve roll 100 can include a bending element 110 and a support shaft 102.

[0103] In operation, the sleeve roll belt typically runs through the dewatering zone on the bending element. The bending element 110 can exert an increased force that stretches the sleeve roll belt on the bending element 110. The bending element 110 can be movable, that is, the radius of curvature of the sleeve roll belt on the surface of the bending element 110 can be controlled by moving the bending element 110 towards the center of the sleeve roll or outwards from the outer surface of the sleeve roll. Thus, the extension of the sleeve roll belt 10 can vary from a normal rate to a high rate.

[0104] The sleeve roll 100 also includes a sleeve roll belt 10, which is typically disposed around the outer surface of the sleeve roll 100. The sleeve roll belt 10 can be guided to circle around the support shaft 102.

[0105] In addition, the sleeve roll 100 can include a plurality of support elements located on the support shaft 102, and these support elements are arranged at a certain distance from each other. The sleeve roll belt 10 that can circle around the outer surface of the sleeve roll can be supported by these support elements.

[0106] The sleeve roll belt 10 is arranged or can be arranged in association with the sleeve roll 100 such that its outer surface 12 can face the fiber web, while its inner surface 11 faces the sleeve roll. Thus, the sleeve roll 100 can be surrounded by the annular sleeve roll belt 10.

[0107] During the working duration of the belt, due to the action of the movable bending element 110, the circumference of the sleeve roll belt may increase and decrease. Therefore, in order to be able to cope with the extension caused by the bending element 110 of the sleeve roll, the sleeve roll belt can have high elasticity. In addition, the sleeve roll belt can have good strength characteristics so that it will not break easily.

[0108] The sleeve roll 100 can include at least one curved dewatering zone C1, C2, and these dewatering zones generally include at least two local bending parts C1, C2 such that the radius of curvature of the first local bending part C1 can be greater than that of the second local bending part C2 following the first local bending part C1 in the running direction MD of the sleeve roll belt. This can improve the dewatering from the fiber web.

[0109] The curved dewatering zones C1, C2 can be formed by the bending element 110 of the sleeve roll 100. The degree of curvature of the bending element 110 can increase in the running direction of the belt 10, so that at the at least one curved dewatering zone C1, C2 on the bending element 110, an increased dewatering pressure is applied to the fiber web traveling between the multiple meshes. The curved dewatering zones C1, C2 on the bending element 110 can include several bending parts, such that the radius of curvature preferably decreases in the running direction of the mesh. This can improve the dewatering from the fiber web.

[0110] The bushing roll 100 may include a lubricant disposed between the inner surface 11 of the bushing roll belt 10 and the outer surface of the bushing roll 100. Thus, the bushing roll may include, for example, one or more lubrication pumps that may be used to pump the lubricant into the gap between the belt 10 and the outer surface of the bushing roll.

[0111] The bending element 110 may move between two or more positions. Thus, the bending element 110 may be used to control the radius of curvature of the belt 10 on the bending element 110.

[0112] The first position of the bending element 110 may form a first surface 110a on the bending element. The first surface 110a may have the same radius of curvature as the surface adjacent to the bending element.

[0113] In the second position of the bending element 110, the outer surface of the bending element may be moved outward. Thus, the second position of the bending element 110 may form a second surface 110b on the bending element. If compared with the surface adjacent to the bending element, the second surface 110b may have a reduced radius of curvature.

[0114] In the second position of the bending element 110, the bushing roll belt 10 may need to be stretched due to the action of the bending element 110. In addition, if the bending element 110 is movable, when the bending element is moved back to the first position, the bushing roll belt 10 may need to return to its initial shape. Thus, the bushing roll belt 10 may need to have good elasticity and suitable strength characteristics.

[0115] As discussed above, the bushing roll belt 10 may be arranged to run around the bushing roll 100. The inner surface 11 of the bushing roll belt 10 may slide against the outer surface of the bushing roll 100. The fibrous web to be processed may be guided to the bushing roll belt 10, typically supported by one or more fabrics (such as a mesh). Thus, one or more meshes may be guided through the curvilinear dewatering zones C1, C2, which may be supported by the bushing roll belt 10.

[0116] Bushing roll belt

[0117] The bushing roll belt 10 is assembled or for being assembled into a target object (such as on a bushing roll in the wire section of a paper machine).

[0118] The belt 10 has a length, a perimeter, and a thickness. The thickness is the smallest dimension. The perimeter and the length may be selected such that the belt fits the bushing roll 100. The perimeter of the bushing roll belt 10 is determined such that the inner diameter of the bushing roll belt 10 will be suitable for the bushing roll during operation.

[0119] The length of the belt in the transverse direction is determined according to the machine width and can, for example, be in the range between 1.5 m and 12.6 m.

[0120] The circumference of the bush roll belt 10, i.e., the length for one revolution, can be equal to or greater than 2.2 m, for example equal to or greater than 3.0 m, or equal to or greater than 3.4 m. Additionally, the circumference of the belt 10 is preferably not greater than 6.3 m, for example equal to or less than 6.0 m, or equal to or less than 5.8 m.

[0121] The thickness of the bush roll belt can be at least 2 mm, more preferably at least 2.5 mm, and most preferably at least 3 mm. In this way, at least some of the yarns can be arranged inside the belt. Additionally, the thickness of the bush roll belt can be equal to or less than 7 mm, more preferably equal to or less than 5 mm, and most preferably equal to or less than 4 mm, for example in the range from 2.5 mm to 5 mm. This thickness can be particularly suitable for bush rolls with auxiliary yarns. Additionally, the said thickness together with the material and the reinforcement structure of the belt can provide good strength properties for the bush roll belt.

[0122] The outer surface 12 of the bush roll belt can be smooth or at least substantially smooth, as Figures 3a to 3d shown. In this way, the outer surface 12 of the bush roll belt can, for example, not have grooves. The said belt with a smooth outer surface can not have grooves or pattern parts with a depth exceeding 0.4 mm. In particular, the smooth surface can not have any area greater than 10 mm 2 and with a depth greater than 0.4 mm.

[0123] The deviation (error) of the outer surface 12 of the belt 10 can, for example, be less than 0.3 mm, such as equal to or less than 0.2 mm. In this way, the smoothness of the outer surface 12 can be improved. Additionally, by means of the smooth or at least substantially smooth outer surface 12, the first yarn can be arranged close to the outer surface 12 of the belt. Therefore, the characteristics of the bush roll belt can be improved, thereby reducing the surface wear of the belt and the surface wear of the mesh inside it.

[0124] The outer surface 12 of the bush roll belt can include light pattern parts, namely so-called buffing. The depth of the buffing on the outer surface 12 of the bush roll belt 10 can be, for example, from 0 to 100 μm, preferably from 0.01 μm to 50 μm. A suitable roughness of the outer surface of the bush roll belt can have an advantageous effect when the bush roll belt interacts with the papermaking machine fabric, especially with the mesh.

[0125] By arranging the first yarn 31 close to the surface of the belt, the wear of the belt can be reduced. Since sufficient strength can be provided by means of the auxiliary yarns 31b, 31c after the first yarn is damaged, the first yarn 31 can be arranged close to the outer surface of the belt.

[0126] The inner surface 11 of the bushing roll belt can be substantially smooth. The bushing roll belt 10 may or may not include a pattern on the inner surface 11 of the belt 10. The inner surface 11 may include a light and shallow pattern portion, namely so-called polishing. The depth of the polishing can be, for example, from 0 to 40 μm, preferably from 0.05 μm to 10 μm. The roughness of the inner surface of the belt can have a significant effect on the durability of the bushing roll belt. For example, the combination of the outer surface of the bushing roll 100 and the rough inner surface 11 of the belt 10 is not as sensitive to deceleration as the combination of the smooth metal surface of the bushing roll 100 and the smooth inner surface 11 of the bushing roll belt, especially when the uniformity of the lubricating oil film is broken. In this case, the bushing roll belt with the polished inner surface 11 cannot be damaged as easily as the belt with a smooth inner surface.

[0127] The belt 10 can be bendable, that is, the belt can be capable of being bent at least a predetermined radius of curvature without breaking. This predetermined radius of curvature can be smaller than the radius of curvature of the surface of the bending element 110 (this is the case at any position of the bending element 110). Therefore, the belt cannot be easily damaged.

[0128] The bushing roll belt can be configured to have a breaking strength (measured in the traveling direction of the bushing roll belt) equal to or greater than 100 kN / m, preferably equal to or greater than 140 kN / m, and most preferably equal to or greater than 160 kN / m, such as from 170 kN / m to 230 kN / m. In this way, even in special situations such as due to an emergency stop of the machine, or if there is not much oil between the outer surface of the bushing roll 100 and the inner surface 11 of the bushing roll belt (for example, when starting the bushing roll after the machine has been shut down), the belt can still not be easily damaged. In addition, the breaking strength of the belt can be less than the breaking strength of the bushing roll in order to protect the bushing roll. Further, the breaking strength of the belt can provide good elasticity for the bushing roll belt.

[0129] In addition, the bushing roll belt can be configured to have a breaking strength equal to or greater than 50 kN / m, preferably equal to or greater than 60 kN / m, more preferably equal to or greater than 70 kN / m, such as from 70 kN / m to 200 kN / m, which is measured in the traveling direction of the bushing roll belt and is determined in the case of no first yarn. In this way, when the first yarn breaks, for example, due to wear of the belt, the belt can not be damaged. In addition, the breaking strength of the belt can be less than the breaking strength of the bushing roll in order to protect the bushing roll.

[0130] The load at a specific elongation (LASE) and the breaking strength can be determined based on Standard SFS 2983. These values can be determined using an Alwetron TCT 20 device manufactured by Lorentzen & Wettre AB (Lorentzen & Wettre, Sweden). The constant rate of elongation (CRE) is used when determining the test values. The application of the load is effected in such a way that the rate of elongation of the sample remains constant. A computerized control system can be used to maintain a constant force. The rate of elongation applied to the sample is 10 mm / min. During the measurement, the sample between the fixed part and the moving clamp is extended by a constant distance (10 mm / min) per time unit, and the force required for this operation is measured. The elongation at break is calculated from the displacement of the clamp.

[0131] The total dimensions of the sample are 240 mm × 30 - 40 mm, where the length of the test sample is 240 mm, the width of the sample is 40 mm at both ends of the sample, and the width in the middle of the sample is 30 mm. The width of the sample in contact with the clamp is 40 mm. During the measurement, a load of 2 kN ± 0.1% is used for samples with a maximum load of less than 1.7 kN. In addition, a load of 20 kN ± 0.1% is used for samples with a maximum load equal to or greater than 1.7 kN.

[0132] The bush roll belt can be configured to have an LASE 2% in the range between 28 kN / m and 50 kN / m. Determined along the travel direction of the bush roll belt, the LASE 2% can be equal to or greater than 28 kN / m, typically equal to or greater than 30 kN / m, and most preferably equal to or greater than 35 kN / m. In addition, determined along the travel direction of the bush roll belt, the LASE 2% can be equal to or less than 50 kN / m, or equal to or less than 40 kN / m. Thus, the belt can have a good level of stretchability for the bush roll belt.

[0133] The bush roll belt can be configured to have an LASE 4% in the range between 47 kN / m and 80 kN / m. Determined along the travel direction of the bush roll belt, the LASE 4% can be equal to or greater than 47 kN / m, typically equal to or greater than 50 kN / m, and most preferably equal to or greater than 52 kN / m. In addition, determined along the travel direction of the bush roll belt, the LASE 4% can be less than 80 kN / m, for example equal to or less than 70 kN / m. The technical effect is that the belt can perform well under high loads and has good stretchability and good dimensional stability characteristics. In addition, the belt with the specific elongations (LASE 2% and LASE 4%) can have good predictability, that is, the elongation of the belt can be predicted under different stresses.

[0134] The bushing roll belt can be configured to be stretched with a force of 30 kN / m in the traveling direction of the bushing roll belt, so that after the force stretching the belt is removed, the belt will return to its original length. Thus, in the traveling direction of the belt, the belt can have good stretchability and elasticity.

[0135] The bushing roll belt can be configured to be stretched by an amount equal to or greater than 1.5% in the traveling direction of the belt, such as in the range between 1.5% and at least 3.0%, or stretched from 2.0% to 5.0%, so that after the force stretching the belt is removed, the belt will return to its original length. Preferably, the bushing roll belt can be configured to be stretched by at least 2.0%, more preferably at least 2.2% in the traveling direction of the bushing roll belt, so that after the force stretching the belt is removed, the belt will return to its original length.

[0136] This novel bushing roll belt can be configured such that the elastic stretch ratio in the first direction is at least 10% greater than that in the second direction. Advantageously, the elasticity of the belt in the second direction can be at least 20% less than the elasticity of the belt in the first direction.

[0137] The bushing roll belt and the yarns therein can be manufactured in a manner known per se. The bushing roll belt can be manufactured, for example, by the following steps:

[0138] Providing a number of yarns;

[0139] Forming an elastic body for the bushing roll belt by casting at least one elastomeric material against a die surface; and

[0140] Curing the frame.

[0141] The bushing roll belt is for mounting on a bushing roll of a paperboard machine, a paper machine, a pulping machine or a tissue paper machine, preferably within the wire section of these machines. The bushing roll belt can also include, for example, a plurality of attachment points 60 of the belt for mounting the belt.

[0142] The bushing roll belt 10 can be formed as an endless loop without ends.

[0143] Body of the belt

[0144] The bushing roll belt 10 can be made of a variety of materials that are suitable for paper machines, paperboard machines, pulping machines and tissue paper machines, that do not damage the wire, and that have suitable stretching properties and strength properties.

[0145] The bushing roll belt can include one or more polymers. The body 15 can include or be composed of an elastomeric material. This elastomeric material is preferably the main raw material of the bushing roll belt.

[0146] The body of the belt may comprise or consist of the following materials:

[0147] Polyurethane; and / or

[0148] Natural rubber (NR); and / or

[0149] Synthetic rubber (SR).

[0150] Based on the total weight of the belt, the total amount of these materials may be at least 50% by weight (wt.%), more preferably at least 70% by weight, and most preferably equal to or greater than 80% by weight. In this way, the elasticity and bendability (flexibility, bending ability) of the belt can be improved. These materials can be used to obtain good strength and elastic properties for the belt; thus, during the working hours, the belt can be stretched and bent without breaking. In addition, based on the total weight of the bushing roller belt, the bushing roller belt may comprise less than 99.9% by weight of these materials, more preferably less than 97% by weight, and preferably less than 95% by weight. For example, the reinforcing structure generally comprises one or more other materials.

[0151] The body 15 of the belt may comprise polyurethane. Preferably, the body 15 consists of or mainly comprises polyurethane. Advantageously, based on the total weight of the bushing roller belt, the bushing roller belt comprises at least 50% by weight of polyurethane, more preferably at least 70% by weight, and preferably at least 80% by weight. In addition, based on the total weight of the bushing roller belt, the bushing roller belt may comprise less than 99.9% by weight of polyurethane, more preferably less than 97% by weight, and preferably less than 95% by weight. Polyurethane can enhance the properties of the bushing roller belt, such as elasticity and bendability, and is particularly suitable for use in combination with the bushing roller 100 having the bending element 110.

[0152] Currently, the vast majority of polyols used to produce polyurethane are obtained from petrochemical products. For environmental protection reasons, the belt may comprise polyurethane containing bio-based components. Preferably, the body of the belt comprises, mainly comprises, or consists of bio-based and / or recycled polyurethane. Bio-based polyurethane may comprise 20% to 100% of one or more bio-based components.

[0153] Reinforcement structure of the belt

[0154] As already discussed, the bushing roller belt 10 may comprise a reinforcing structure 30 in order to obtain good strength properties. However, the bushing roller belt may require very high elasticity, and therefore, the reinforcing structure should not reduce the elasticity of the bushing roller belt too much.

[0155] The bending element 110 of the bushing roll 100 may impose high stresses on the bushing roll belt. Therefore, the bushing roll belt 10 may need to have a suitable reinforcement structure. However, since the bending element 110 typically forces the bushing roll belt to stretch and / or compress, the bushing roll belt may need to have both good strength and good elasticity. Traditionally, it has been challenging to obtain a belt for a bushing roll because such a belt may need to have a reinforcement structure to provide good strength characteristics for the belt while not hindering the stretching of the belt over the bending element 110. The level of stretching of the belt can be controlled by the reinforcement structure 30 of the bushing roll belt.

[0156] This novel bushing roll belt can have good strength characteristics and suitable elasticity, and has the ability to stretch. The reinforcement structure 30 of the bushing roll belt may include yarns arranged inside the belt so that the material of the elastic body surrounds these yarns. The belt may include those yarns arranged close to the outer surface of the belt.

[0157] The reinforcement structure 30 can be a support structure of the belt, which is formed by yarns 31, 31b, 31c, 32. Figures 3a to 3d and Figure 4 Illustrates various exemplary structures of the belt 10, which include a body 15, a first yarn 31, a second yarn 32, and auxiliary yarns 31b, 31c. The belt may include the material of the body 15 between adjacent yarns 31, 31b, 31c, 32.

[0158] The yarns 31, 32, 31b, 31c are preferably arranged in multiple layers inside the elastic body 15. The reinforcement structure 30 can provide suitable strength characteristics for the bushing roll belt and the ability to restore the belt to its initial shape after stretching caused by the bending element 110.

[0159] The reinforcement structure 30 can include a first yarn 31 arranged along a first direction D1, and auxiliary yarns 31b, 31c arranged at least generally along the first direction D1. The reinforcement structure 30 can also include a second yarn 32 arranged along a second direction D2.

[0160] The second yarn 32 can be arranged perpendicular or substantially perpendicular to the first yarn 31. In addition, the second yarn 32 can be arranged perpendicular or substantially perpendicular to the auxiliary yarns 31b, 31c. The technical effect is to provide good strength characteristics in the travel direction and the transverse direction of the bushing roll belt. In one embodiment, the first yarn and the auxiliary yarns form a first yarn layer, while the second yarn forms a second yarn layer. Thus, in one embodiment, a total of two reinforcement yarn layers 31, 31b, 31c, 32 are provided.

[0161] Thus, as discussed, the reinforcing structure 30 of the bushing roller belt 10 may include a second yarn 32 arranged along the second direction D2. The angle between the second yarn 32 and the cross direction CD is preferably less than 15°, more preferably less than 10°, and most preferably less than 5°. The second direction may be parallel or substantially parallel to the cross direction CD of the bushing roller belt. The second yarn 32 may not need to have high stretchability because the belt hardly stretches in the cross direction. Thus, the elasticity of the second yarn 32 may be less than that of the first yarn 31. However, the second yarn 32 may need to have good strength. The technical effect of the second yarn 32 may be to improve the dimensional stability of the bushing roller belt in the cross direction.

[0162] The first direction D1 may be parallel or substantially parallel to the running direction MD of the bushing roller belt. The angle between the first yarn 31 and the running direction MD of the belt is preferably less than 15°, more preferably less than 10°, and most preferably less than 5°. Thus, a good reinforcing structure can be formed for the running direction of the bushing roller belt 10. The first yarns 31 may have high stretchability so that they can run well with the bending elements 110 of the bushing roller. In addition, the first yarns may have good strength characteristics. In this way, the first yarns 31 can provide good stretchability and / or elasticity for the support structure of the belt and provide sufficient strength for the belt in the running direction of the belt.

[0163] Advantageously, the first yarns 31 and the auxiliary yarns 31b, 31c are arranged to be substantially perpendicular to the second yarn 32. The angle between the first yarn and the second yarn is preferably about 90°, such as in the range between 80° and 100°. In addition, the angle between the auxiliary yarn and the second yarn is preferably about 90°, such as in the range between 80° and 100°.

[0164] Advantageously, the reinforcing structure is composed of the first yarn, the second yarn and the auxiliary yarns.

[0165] The second yarns 32 may be arranged adjacent to each other at a certain distance from each other so that the elastic body material is fixed around the yarns 32.

[0166] The first yarns 31 may be arranged adjacent to each other at a certain distance from each other so that the elastic body material is fixed around these yarns. In addition, the auxiliary yarns may be arranged between these first yarns and / or arranged below these first yarns.

[0167] Yarns in different layers can be in contact with or incorporated into the yarns of the next layer, or these yarns can be spaced apart from each other. Preferably, the reinforcing yarn layers on top of each other are separated from each other. In this way, the multiple yarn layers do not have to be fastened or joined to each other in any way. Additionally, adjacent yarns do not have to be fastened or joined to each other in any way.

[0168] Advantageously, the reinforcing structure 30 includes yarns arranged in two layers inside the elastic body 15, and these layers are arranged substantially perpendicular to each other. The first yarn layer can include or consist of a first yarn and auxiliary yarns. The second yarn layer can include or consist of a second yarn.

[0169] The first yarn and the auxiliary yarns can be arranged above the second yarn layer, for example, at a small distance from the second yarn layer. The first yarn and the auxiliary yarns can be arranged 0 mm to 2.0 mm, preferably 0.2 mm to 1.0 mm, above the second yarn.

[0170] The reinforcing yarns can be separate yarns adjacent to each other, or they can be formed, for example, by one or more yarns placed in a spiral and parallel. Adjacent reinforcing yarns can be spaced, for example, 0.5 to 3 mm apart, so that the area between the reinforcing yarns preferably includes or consists of the elastic body material.

[0171] The second yarn layer can be the innermost yarn layer closest to the inner surface 11 of the bushing roller belt 10. The second yarn layer can consist of multiple separate yarns. In this way, adjacent yarns can be spaced apart from each other. Preferably, the second yarns are evenly or substantially evenly spaced apart. Thus, each second yarn can be arranged at the same distance from adjacent yarns. Adjacent second yarns can be spaced apart, for example, 0.5 to 3.5 mm. The area between adjacent second yarns preferably consists of the elastic body material.

[0172] The first yarn layer can consist of multiple separate yarns. Therefore, adjacent yarns can be spaced apart from each other. Preferably, the first yarns are evenly or substantially evenly spaced apart. In this way, each first yarn can be arranged at the same distance from adjacent yarns. Adjacent first yarns can be spaced apart, for example, 0.5 to 3.5 mm. The area between adjacent first yarns can consist of the elastic body material and auxiliary yarns.

[0173] The thickness of the first yarn and the second yarn can be the same or different. Preferably, the thicknesses of the second yarns are substantially the same as each other. Additionally, the thicknesses of the first yarns are preferably substantially the same as each other. The first yarn can have the same thickness as the second yarn.

[0174] The diameter of each first yarn can be, for example, in the range between 0.3 mm and 3.0 mm, preferably in the range between 0.5 mm and 2 mm. The technical effect is to obtain good strength characteristics and good dimensional stability in the traveling direction of the belt.

[0175] The diameter of each second yarn can be, for example, in the range between 0.3 mm and 3.0 mm, preferably in the range between 1 mm and 2 mm. The technical effect is to obtain good strength characteristics and good dimensional stability in the transverse direction of the belt. Thereby, the bushing roll belt can be firmly attached to the bushing roll.

[0176] The second yarn can be arranged to have a depth in the range between 0 and 2 mm, which is determined from the inner surface of the first yarn to the outer surface of the second yarn.

[0177] The first yarn 31 can be arranged inside the elastic body 15 of the belt 10. The first yarn 31 can be arranged at a depth in the range between 0 mm and 3.0 mm, which is measured from the outer surface 12 of the belt to the outer surface 31-o of the first yarn 31 in the depth direction of the belt. Preferably, the first yarn 31 is arranged at a depth equal to or greater than 0.2 mm, more preferably arranged at a depth equal to or greater than 0.5 mm, and most preferably arranged at a depth equal to or greater than 1.0 mm, which is measured from the outer surface of the belt to the outer surface 31-o of the first yarn 31 in the depth direction of the belt. The depth can be equal to or less than 2.5 mm, more preferably equal to or less than 2.0 mm, and most preferably equal to or less than 1.5 mm, such as in the range between 0.5 mm and 1.5 mm, which is measured from the outer surface 12 of the belt to the outer surface 31-o of the first yarn 31 in the depth direction of the belt. The technical effect is that the neutral axis of the belt can be close to the outer surface of the bushing roll belt. Thus, in use, the speed difference between the outer surface of the belt and the surface of the mesh in contact with the belt can be reduced. In addition, the friction between the belt and the mesh can be reduced. Therefore, the surface wear of the belt and the surface wear of the mesh can be reduced. If the first yarn 31 is at least generally aligned along the traveling direction of the belt and is arranged close to the outer surface of the belt, the wear of the belt and the wear of the mesh can be significantly reduced. Thereby, the cost caused by the belt can be reduced.

[0178] The belt may include 200 to 700 second yarns per meter, which are arranged in a second direction and measured perpendicular to the second direction. The number of second yarns per meter is preferably equal to or greater than 260 second yarns per meter, more preferably at least 270 second yarns per meter, and most preferably equal to or greater than 280 second yarns per meter. These second yarns are arranged in a second direction and measured perpendicular to the second direction. In addition, the number of second yarns is preferably equal to or less than 600 second yarns per meter, more preferably less than 500 second yarns per meter, and most preferably equal to or less than 400 second yarns per meter. These second yarns are arranged in a second direction and measured perpendicular to the second direction. Thus, a bushing roller belt with good strength characteristics and good dimensional stability in the transverse direction of the belt can be obtained. In this way, the belt can be firmly fastened to the bushing roller.

[0179] The belt may include 200 to 700 first yarns per meter, which are arranged in a first direction and measured perpendicular to the first direction. The number of first yarns per meter is preferably equal to or greater than 210 first yarns per meter, more preferably at least 230 first yarns per meter, and most preferably equal to or greater than 260 first yarns per meter. These first yarns are arranged in a first direction and measured perpendicular to the first direction. In addition, the number of first yarns is preferably equal to or less than 600 first yarns per meter, more preferably less than 500 first yarns per meter, and most preferably equal to or less than 400 first yarns per meter. These first yarns are arranged in a first direction and measured perpendicular to the first direction. Thus, good elasticity and appropriate dimensional stability can be obtained in the traveling direction of the belt.

[0180] These yarns may be made of the same material or different materials. The yarns 31, 32, 31b, 31c may include monofilament yarns and / or multifilament yarns. In this way, each yarn may be monofilament or multifilament. Monofilament means that each yarn has only one filament. Multifilament means that each yarn has more than one filament.

[0181] The multifilament structure may have multiple filaments twisted together. Advantageously, these yarns include multifilament yarns or are composed of multifilament yarns. These yarns 31, 32, 31b, 31c are most preferably twisted multifilament yarns. However, a multifilament structure with filaments twisted together may cause the entire yarn to break when the outer surface of the yarn is damaged. With the aid of the auxiliary yarn, even when the outer surface of the first yarn is damaged and the first yarn loses its strength, the strength characteristics of the belt can still be maintained at a sufficient level.

[0182] The number of filaments has an impact on the properties of the yarn. Preferably, these yarns are multifilament yarns, each yarn having from 5 to 10,000 filaments. These yarns can have equal to or more than 5 filaments per yarn, more preferably equal to or more than 200 filaments per yarn, and most preferably equal to or more than 600 filaments per yarn. In addition, these yarns can have equal to or less than 10,000 filaments per yarn, more preferably equal to or less than 4,000 filaments per yarn, and most preferably equal to or less than 2,000 filaments per yarn.

[0183] These yarns can include synthetic fibers having high strength, high modulus, and high elastic modulus. These yarns can include at least one of the following materials:

[0184] Polyamide (PA), such as nylon;

[0185] Polypropylene (PP);

[0186] Polyethylene (PE), preferably so-called high-strength polyethylene;

[0187] Rayon;

[0188] Viscose;

[0189] Polyester, preferably polyethylene terephthalate (PET);

[0190] Polyvinyl alcohol (PVA, PVOH);

[0191] Polyarylamide;

[0192] Polyphenylene sulfide (PPS);

[0193] Liquid crystal plastic (LCP);

[0194] Polyimide;

[0195] Carbon fiber, preferably carbon fiber / thermoplastic composite;

[0196] Polyethylene naphthalate (PEN); and

[0197] Polyether ether ketone (PEEK).

[0198] The total amount of the above materials is preferably at least 60% by weight, more preferably at least 80% by weight, and most preferably at least 95% by weight, calculated based on the total weight of these yarns. In this way, the yarns comprising or consisting of the materials mentioned above can stiffen the belt, but still allow the necessary level of bending and stretching of the belt. For example, polyester and polyamide, for example, can provide suitable support for the belt. In addition, carbon fibers can be used to improve the strength of the belt, especially in the transverse direction of the belt. In addition, carbon fibers and carbon fiber / thermoplastic composites can be used to minimize the stretching of the belt in the transverse direction.

[0199] The specific stress (N / tex) of each first yarn 31 can, for example, be in the range between 0.4 N / tex and 4 N / tex. Thereby, suitable strength characteristics can be obtained in the traveling direction of the belt.

[0200] The specific stress (N / tex) of each second yarn 32 can, for example, be in the range between 0.5 N / tex and 4 N / tex. N / tex means Newton per tex. Thereby, good strength characteristics can be obtained in the transverse direction of the belt.

[0201] The tensile strength of the second yarn can be higher than the tensile strength of the first yarn, preferably at least 4% higher, more preferably at least 8% higher, per unit area of the bushing roller belt.

[0202] The bushing roller belt can have a lighter reinforcement structure in the first direction D1 of the belt than in the second direction D2 of the belt. Therefore, this novel bushing roller belt can have high stretchability in the second direction. Thus, when the bushing roller belt is bent (for example, on the bending element 110 such that it needs to be stretched), the first yarn and the auxiliary yarn can yield and thus stretch in their longitudinal direction. However, the reinforcement structure can still be able to control the stretching level of the belt. Thereby, this novel bushing roller belt can not be as easily damaged as a belt that does not have a reinforcement structure.

[0203] The first yarn or at least some of the first yarns can be made of a visually distinguishable material that is visually perceptible relative to the color of the body. In this way, the loss level of the belt can be easily noticed, so that the belt can be replaced before the auxiliary yarn is damaged.

[0204] Auxiliary yarn

[0205] As discussed, the belt includes auxiliary yarns 31b, 31c. By means of the auxiliary yarns, the belt can maintain a suitable strength in the event that the first yarn 31 is damaged. The auxiliary yarns can have a smaller diameter than the first yarn. Thus, the neutral axis of the belt can be substantially not displaced by the auxiliary yarns, but even if the auxiliary yarns are arranged at a greater depth than the depth of the first yarn, the surface wear of the belt can still be maintained at a reduced level.

[0206] The auxiliary yarns 31b, 31c are preferably arranged parallel or at least substantially parallel to the first direction D1. The angle between the auxiliary yarns 31b, 31c and the first direction D1 of the belt is preferably less than 15°, more preferably less than 10°, and most preferably less than 5°. Thereby, even if the first yarn breaks, a suitable reinforcement structure can still be obtained for the traveling direction of the bushing roll belt 10.

[0207] The auxiliary yarns can have greater stretchability than the first yarn, which can reduce the influence of these auxiliary yarns on the position of the neutral axis of the belt. Even if the first yarn is damaged, the auxiliary yarns 31b, 31c can still provide suitable stretchability and sufficient strength to the belt in the traveling direction of the belt.

[0208] The auxiliary yarns 31b, 31c can be arranged parallel or at least substantially parallel to the traveling direction of the belt. The angle between the auxiliary yarns 31b, 31c and the traveling direction of the belt can be less than 10°, more preferably less than 5°, and most preferably less than 2°. Thereby, even if the first yarn breaks, a suitable reinforcement structure can still be obtained for the traveling direction of the bushing roll belt 10. As discussed, even if the first yarn is damaged, the auxiliary yarns 31b, 31c can still provide good stretchability and sufficient strength to the belt in the traveling direction of the belt.

[0209] In one embodiment, it is advantageous that the angle of the auxiliary yarn relative to the traveling direction (i.e., the rotational direction of the bushing roll belt) is not greater than 2°, such as 0° to 2°, more advantageously not greater than 1°, and preferably not greater than 0.5°, such as 0.0° to 0.5°. In this way, the auxiliary yarn can be particularly effective when used with the first yarn.

[0210] The auxiliary yarn or at least some of the auxiliary yarns can be made of a visually distinguishable material, which is visually perceptible relative to the color of the body 15 and the first yarn 31. Thereby, the loss level of the belt can be easily noticed, so that the belt can be replaced before the auxiliary yarn is damaged.

[0211] If the first yarn is made of a material that is visually perceptible relative to the color of the body, and the auxiliary yarn is made of a material that is visually perceptible relative to the colors of the body and the first yarn, the wear level of the belt can be determined more precisely. Additionally, in this embodiment, the first yarn and the auxiliary yarn can be used as belt wear indicators. Thus, no other type of belt wear indicator may be required.

[0212] In one embodiment, the belt includes:

[0213] A first auxiliary yarn 31b, made of a material that is visually perceptible relative to the colors of the body and the first yarn 31;

[0214] A second auxiliary yarn 31c, made of a material that is visually perceptible relative to the colors of the body, the first auxiliary yarn, and the first yarn; and

[0215] Optionally, a first yarn 31, made of a material that is visually perceptible relative to the colors of the body and the auxiliary yarns 31b, 31c.

[0216] Thus, in this embodiment, the wear level of the belt can be determined precisely without any other type of belt wear indicator.

[0217] The auxiliary yarns can be arranged adjacent to each other at a certain distance from each other. The diameter of the auxiliary yarns, as well as the material and number of the auxiliary yarns, can affect the characteristics of the bushing roll belt.

[0218] Measured perpendicular to the first direction, the belt can include 100 to 800 auxiliary yarns per meter. The number of auxiliary yarns (measured perpendicular to the first direction) is preferably equal to or greater than 200 yarns per meter, more preferably at least 250 yarns per meter, and most preferably equal to or greater than 300 yarns per meter. Additionally, the number of auxiliary yarns (measured perpendicular to the first direction) is preferably equal to or less than 700 yarns per meter, more preferably less than 600 yarns per meter, and most preferably equal to or less than 500 yarns per meter. Thus, even if the first yarn is broken, good elasticity can still be obtained in the traveling direction of the belt and sufficient strength can be provided.

[0219] The relative number of yarns RNY in the belt can be calculated as follows:

[0220] RNY = N(31) / N(31b + 31c)

[0221] where N(31) refers to the number of first yarns N per meter, and

[0222] N(31b + 31c) refers to the number of auxiliary yarns N per meter.

[0223] The relative number of yarns RNY, i.e., the number of the first yarns per m divided by the number of the auxiliary yarns per m, can be equal to or greater than 0.5, such as in the range between 0.5 and 3, preferably in the range between 1 and 2.5, and most preferably in the range between 1 and 2.

[0224] In one embodiment, there are 1 to 3 auxiliary yarns between adjacent first yarns (determined perpendicular to the first direction), and there are 1 to 3 first yarns between adjacent auxiliary yarns (determined perpendicular to the first direction). Thus, sufficient strength characteristics and dimensional stability can be obtained in the traveling direction of the belt both when the first yarns are present and after the first yarns are damaged.

[0225] The first yarns and the auxiliary yarns can be in contact with adjacent yarns or be bonded to adjacent yarns, or these yarns can be spaced apart from each other. Preferably, the auxiliary yarns and the first yarns are separated from each other. In this way, the first yarns do not have to be fastened or bonded to the auxiliary yarns in any way. This can improve the strength characteristics of the belt when the first yarns are damaged.

[0226] Each first yarn and each auxiliary yarn can be arranged at the same or substantially the same distance from adjacent yarns.

[0227] Determined perpendicular to the first direction, adjacent auxiliary yarns can be spaced apart, for example, by 0.2 mm to 2 mm. The auxiliary yarns do not have to be fastened or bonded to each other in any way.

[0228] The thicknesses of the auxiliary yarns can be the same or different from each other. At least the thicknesses of the first auxiliary yarns 31b can be substantially the same as each other. In addition, the thicknesses of the second auxiliary yarns 31c (if used) can be substantially the same as each other. Thus, the auxiliary yarns can include yarns with the same diameter as each other, or the diameters can vary.

[0229] The auxiliary yarns can include or consist of first auxiliary yarns, and all the first auxiliary yarns have substantially the same diameter. The auxiliary yarns can include second auxiliary yarns, and all the second auxiliary yarns have substantially the same diameter. The second auxiliary yarns can have a different diameter from the first auxiliary yarns.

[0230] Referring to Figures 3c to 3d and Figure 4 , the auxiliary yarns 31b, 31c can include or consist of the first auxiliary yarns 31b and the second auxiliary yarns 31c, wherein

[0231] all the first auxiliary yarns 31b have substantially the same diameter as each other,

[0232] all the second auxiliary yarns 31c have substantially the same diameter as each other, and

[0233] The first auxiliary yarn 31b and the second auxiliary yarn 31c have different diameters.

[0234] Thus, the thicknesses of the auxiliary yarns or at least the first auxiliary yarn can be substantially the same as each other. Additionally, the thicknesses of the second auxiliary yarns (if used) can be substantially the same as each other. This can improve the controllability of the strength characteristics and the controllability of the position of the neutral axis of the belt, particularly when the belt begins to wear.

[0235] Referring to Figures 3a to 3d and Figure 4 and, the auxiliary yarns 31b, 31c can be arranged at a greater depth than the depth of the first yarn, which is determined from the outer surface of the belt to the outer surfaces 31-o, 31b-o of the yarns in the depth direction of the belt. Preferably, the auxiliary yarns 31b, 31c are arranged at a depth that is at least 10%, more preferably at least 20%, and most preferably at least 30% greater than the depth of the first yarn, which is determined from the outer surface of the belt to the outer surfaces 31-o, 31b-o of the yarns in the depth direction of the belt. The outer surfaces of the auxiliary yarns can be at a greater depth than the outer surface of the first yarn. Thus, even if the first yarn is damaged due to wear of the belt, the auxiliary yarns can keep the strength of the belt at an acceptable level in the traveling direction of the belt. Thereby, even when the outer surface of the first yarn is damaged and the first yarn loses its strength, the strength characteristics of the belt can still be maintained at a sufficient level.

[0236] The auxiliary yarns 31b, 31c can be arranged at a greater depth than the depth of the first yarn, which is determined from the outer surface of the belt to the inner surfaces 31-i, 31b-i of the yarns in the depth direction of the belt. Preferably, the auxiliary yarns 31b, 31c are arranged at a depth that is at least 10%, more preferably at least 20%, and most preferably at least 30% greater than the depth of the first yarn, which is determined from the outer surface of the belt to the inner surfaces 31-i, 31b-i of the yarns in the depth direction of the belt. Thereby, even when the first yarn is completely damaged, the strength characteristics of the belt can still be maintained at a sufficient level for a relatively long time.

[0237] The auxiliary yarn can be arranged inside the elastic body at a depth that is at least 10% greater than the depth of the first yarn, where this depth is determined from the outer surface of the belt to the center point of these yarns in the depth direction of the belt. More preferably, the auxiliary yarn is arranged inside the elastic body at a depth that is at least 20% greater than the depth of the first yarn, where this depth is determined from the outer surface of the belt to the center point of these yarns in the depth direction of the belt. Most preferably, the auxiliary yarn is arranged inside the elastic body at a depth that is at least 30% greater than the depth of the first yarn, where this depth is determined from the outer surface of the belt to the center point of these yarns in the depth direction of the belt. If the auxiliary yarn is further arranged to such a depth, the auxiliary yarn can provide sufficient strength for the belt after the first yarn is damaged.

[0238] The auxiliary yarn can be arranged at a depth equal to or greater than 0.1 mm, more preferably at a depth equal to or greater than 0.2 mm, and most preferably at a depth equal to or greater than 0.4 mm, where this depth is measured from the outer surface 31-o of the first yarn to the outer surface 31b-o of the auxiliary yarn in the depth direction of the belt. In addition, the auxiliary yarn can be arranged at a depth equal to or less than 2 mm, more preferably at a depth equal to or less than 1.5 mm, and most preferably at a depth equal to or less than 1 mm, where this depth is measured from the outer surface 31-o of the first yarn to the outer surface 31b-o of the auxiliary yarn in the depth direction of the belt. Thus, the auxiliary yarn can be kept not too far from the outer surface of the belt, and therefore, the neutral axis of the belt can be kept close to the outer surface of the bushing roll belt. In addition, if, for example, damage due to wear of the belt causes the first yarn to lose its strength, the auxiliary yarn can maintain the strength of the belt at a certain level.

[0239] In addition, in order to control the neutral axis of the belt, the auxiliary yarn can be arranged inside the elastic body such that the depth at which the entire auxiliary yarn is located is less than the depth of the second yarn, where this depth is determined in the depth direction of the belt.

[0240] By arranging the neutral axis of the belt close to the outer surface of the belt, the outer surface 12 of the belt may experience less wear, while the inner surface 11 of the belt may experience more wear. However, this may not cause problems for the belt because there is usually a lubricant layer (such as an oil layer) between the outer surface of the bushing roll 100 and the inner surface 11 of the belt. Thus, the friction between the belt and the bushing roll is usually very small. Therefore, even if the neutral axis of the belt is close to the outer surface of the belt, the inner surface of the belt may not wear too much.

[0241] To keep the neutral axis of the belt close to the outer surface of the belt, the auxiliary yarns 31b, 31c are preferably finer than the first yarn 31. Thus, the diameter of the auxiliary yarns is preferably less than the diameter of the first yarn. In addition, the auxiliary yarns can be finer than the second yarn 32.

[0242] Determined by the diameter of the yarns, the auxiliary yarns 31b, 31c are at least 20% finer than the first yarn, preferably 30% or more finer than the first yarn 31, more preferably 40% or more finer than the first yarn 31, and most preferably 50% or more finer than the first yarn 31, such as 30% to 70% finer than the first yarn 31. In this way, even if the first yarn is damaged, suitable strength characteristics can still be obtained in the traveling direction of the sleeve roll belt while (substantially) maintaining the position of the neutral axis of the belt. Thus, the diameter of the auxiliary yarns can be significantly smaller than the diameter of the first yarn, and therefore, the wear level of the belt (and the mesh) during use can be maintained at a suitable level. Further, by means of the reduced diameter, the auxiliary yarns can be a cost-effective and environmentally friendly solution.

[0243] The diameter of the auxiliary yarns can range between 0.1 mm and 1.5 mm. The diameter of the auxiliary yarns is preferably equal to or less than 1.2 mm, more preferably equal to or less than 1.0 mm, and most preferably equal to or less than 0.9 mm. In addition, the diameter of the auxiliary yarns is preferably equal to or greater than 0.1 mm, more preferably equal to or greater than 0.2 mm, and most preferably equal to or greater than 0.3 mm. The technical effect is that even when these first yarns are damaged, sufficient strength characteristics can still be obtained in the traveling direction of the sleeve roll belt without having too much impact on the position of the neutral axis of the belt.

[0244] Referring to Figure 3c and Figure 3d , the belt can include a first auxiliary yarn and a second auxiliary yarn.

[0245] The diameter of the second auxiliary yarn (if used) can be determined from the diameter of the first auxiliary yarn as 10% - 90%, preferably 20% to 80%. In this embodiment, the second auxiliary yarn is preferably at a greater depth (determined from the outer surface of each yarn) than the first auxiliary yarn. The technical effect is that even when some of the first auxiliary yarns are damaged, sufficient strength characteristics can still be obtained in the traveling direction of the sleeve roll belt without having too much impact on the position of the neutral axis of the belt. In addition, if these yarns are made of a material that is visually perceptible relative to the color of the body and the first yarn, the wear level of the belt can be determined without using other types of belt wear indicators.

[0246] The auxiliary yarns 31b, 31c are preferably twisted multifilament yarns. Preferably, the auxiliary yarns are multifilament yarns, each yarn comprising from 20 to 2000 filaments. Each yarn of the auxiliary yarns may have equal to or greater than 60 filaments, more preferably each yarn has equal to or greater than 100 filaments, and most preferably each yarn has equal to or greater than 200 filaments. In addition, each yarn of the auxiliary yarns may have equal to or less than 1500 filaments, more preferably each yarn has equal to or less than 1000 filaments, and most preferably each yarn has equal to or less than 700 filaments. This can improve the strength characteristics of the belt, especially after the first yarn has been damaged, and does not have too much impact on the position of the neutral axis of the belt.

[0247] As discussed, when the bushing roll belt 10 is stretched and bent at a small radius over the bending element 110 of the bushing roll, the bushing roll belt 10 may be subjected to high stresses. Accordingly, the auxiliary yarns may be made of one or more elastic materials. In a manner that facilitates the passage of the bushing roll belt over the surfaces 110a, 110b of the bending element, the one or more elastic materials may allow the bushing roll belt to be bent at a specific radius of curvature. The first yarns and the auxiliary yarns may have greater stretchability than the second yarns, for example at least 4% greater, more preferably at least 8% greater. Thereby, the belt can be configured to stretch easily over the bending element of the bushing roll.

[0248] The above-mentioned auxiliary yarns may comprise at least one of the following materials or consist of at least one of the following materials:

[0249] Polyamide (PA), such as nylon;

[0250] Polypropylene (PP);

[0251] Polyethylene (PE), preferably so-called high-strength polyethylene;

[0252] Rayon;

[0253] Viscose;

[0254] Polyester, preferably polyethylene terephthalate (PET);

[0255] Polyvinyl alcohol (PVA, PVOH);

[0256] Aramid;

[0257] Polyphenylene sulfide (PPS);

[0258] Liquid crystal plastic (LCP);

[0259] Polyimide;

[0260] Carbon fiber, preferably carbon fiber / thermoplastic composite;

[0261] Polyethylene naphthalate (PEN); and

[0262] Polyetheretherketone (PEEK).

[0263] These materials can be used to provide sufficient strength properties and dimensional stability to the auxiliary yarns. If the auxiliary yarns include carbon fiber composites, in some cases the belt may not stretch as much as when made of some other materials. However, the carbon fiber composites can increase the strength of the belt.

[0264] Preferably, these auxiliary yarns can include at least one of the following or be composed of at least one of the following:

[0265] Polyamide (PA);

[0266] Aramid;

[0267] Polyester, preferably polyethylene terephthalate (PET);

[0268] Polyethylene naphthalate (PEN);

[0269] Rayon; and

[0270] Carbon / thermoplastic composite.

[0271] These materials can be used to provide improved strength properties and dimensional stability to the auxiliary yarns.

[0272] More preferably, the auxiliary yarns include or are composed of the following materials:

[0273] Polyester, preferably polyethylene terephthalate (PET);

[0274] Polyethylene naphthalate (PEN); and

[0275] Rayon.

[0276] These materials can be used to provide a combination of improved stretchability and dimensional stability to the auxiliary yarns.

[0277] Most preferably, the auxiliary yarns include or are composed of polyester. Thereby, the strength, stretchability and dimensional stability of the auxiliary yarns can be improved cost-effectively.

[0278] For environmental protection reasons, the auxiliary yarns can include or be made of one or more biopolymers, and / or the auxiliary yarns can include or be made of one or more recycled polymers.

[0279] In one embodiment, the auxiliary yarn comprises and / or consists of recycled and / or bio-based polyester and / or polyamide. Thus, the auxiliary yarn can be made of, for example, bio-based polyamide.

[0280] The auxiliary yarn can be more elastically flexible than the first yarn. In addition, the auxiliary yarn can be finer than the first yarn.

[0281] The specific stress (N / tex) of each auxiliary yarn 31b, 31c can, for example, be in the range between 0.3 N / tex and 4 N / tex. Thus, even if the first yarn is damaged, suitable strength characteristics can still be obtained in the running direction of the belt.

[0282] The tensile strength of the first yarn can be higher than the tensile strength of the auxiliary yarn, preferably at least 10% higher, more preferably at least 15% higher, with respect to the unit area of the sleeve roll belt. Thus, the auxiliary yarn does not have a great influence on the position of the neutral axis of the belt.

[0283] By means of the sleeve roll belt, the radius of curvature on the bending element 110 of the sleeve roll 100 can be smaller than in the conventional case. Therefore, a bending element can be used that can produce a very small radius of curvature on the belt. This can improve the efficiency of the sleeve roll 100.

[0284] In addition, by means of this novel solution, the auxiliary yarn can be arranged inside the belt so that even if the first yarn is damaged, the strength of the belt can still be maintained at an acceptable level. The auxiliary yarn does not have a great influence on the neutral axis of the belt and, therefore, the wear level of the belt (and the mesh) can be maintained at a suitable level regardless of the situation of the auxiliary yarn.

[0285] In addition, by means of the auxiliary yarn, the first yarn can also have a relatively small diameter, which can improve the stretching of the belt in the running direction of the belt. In this case, since the belt has improved stretching characteristics, the bending element 110 of the sleeve roll can be used in such a way that a higher water removal rate can be obtained.

[0286] When more preferred features are implemented in the sleeve roll belt 10, these advantages are generally better achieved.

[0287] The present invention has now been described with the aid of diagrams and examples. The present invention is not limited to the embodiments presented above but can be modified within the scope of the appended claims.

Claims

1. A bushing roll belt (10), comprising: an inner surface (11); and an outer surface (12), wherein the belt comprises: a body (15); and a reinforcing structure (30), wherein the reinforcing structure (30) comprises: a first yarn (31) arranged along a first direction (D1) of the belt, and a second yarn (32) arranged along a second direction (D2) of the belt, wherein the first yarn is the yarn closest to the outer surface (12) of the belt, characterized in that the reinforcing structure (30) further comprises auxiliary yarns (31b, 31c), the auxiliary yarns being arranged parallel or substantially parallel to the first direction (D1) of the belt, wherein measured in the depth direction of the belt from the outer surface (12) of the body (15) to the outer surface (31-o, 31b-o) of each yarn (31, 31b, 31c), the auxiliary yarns are arranged to a greater depth than the depth of the first yarn, and the diameter of the auxiliary yarns is at least 20% smaller than the diameter of the first yarn.

2. The belt (10) according to claim 1, wherein measured in the depth direction of the belt from the outer surface (12) of the body (15) to the outer surface (31-o, 31b-o) of each yarn (31, 31b, 31c), the auxiliary yarns are arranged to a depth that is at least 10% greater than the depth of the first yarn.

3. The belt (10) according to claim 1, wherein measured in the depth direction of the belt from the outer surface (12) of the body (15) to the center point of each yarn (31, 31b, 31c), the auxiliary yarns (31b, 31c) are arranged to a depth that is at least 10% greater than the depth of the first yarn (31).

4. The belt (10) according to any one of the preceding claims 1, wherein measured in the depth direction of the belt from the outer surface (12) of the body (15) to the bottom surface (31-i, 31b-i) of each yarn (31, 31b, 31c), the auxiliary yarns (31b, 31c) are arranged to a depth that is at least 10% greater than the depth of the first yarn.

5. The belt (10) according to any one of the preceding claims 1 to 4, wherein at least some of the auxiliary yarns (31b, 31c) are made of a material that is visually distinguishable from the color of the body (15) and the first yarn (31).

6. The belt (10) according to any one of the preceding claims 1 to 4, wherein the diameter of the auxiliary yarns (31b, 31c) is in the range between 0.1 mm and 1 mm.

7. The belt (10) according to any one of the preceding claims 1 to 4, wherein measured perpendicular to the first direction, the number of the auxiliary yarns (31b, 31c) is in the range between 100 yarns / m and 800 yarns / m.

8. The belt (10) according to any one of the preceding claims 1 to 4, wherein Measured perpendicular to the first direction, the number of the auxiliary yarns (31b, 31c) per meter ( / m) is at least 0.5 times the number of the first yarn (31) per meter, and Measured perpendicular to the first direction, the number of the auxiliary yarns (31b, 31c) per meter ( / m) is equal to or less than 3 times the number of the first yarn (31) per meter.

9. The belt (10) according to any one of the preceding claims 1 to 4, wherein, the auxiliary yarns (31b, 31c) are arranged to provide a breaking strength of equal to or greater than 50 kN / m measured in the traveling direction of the belt in the absence of the first yarn.

10. The belt (10) according to any one of the preceding claims 1 to 4, wherein, the diameter of the first yarn (31) is in the range between 0.3 mm and 3 mm, and / or the diameter of the second yarn (32) is in the range between 0.3 mm and 3 mm.

11. The belt (10) according to any one of the preceding claims 1 to 4, wherein, measured in the depth direction of the belt from the outer surface (12) of the body (15) to the outer surface (31b-o) of each auxiliary yarn (31b, 31c), the auxiliary yarns (31b, 31c) are arranged to a depth of equal to or less than 2 mm.

12. The belt (10) according to any one of the preceding claims 1 to 4, wherein, the auxiliary yarn (31b) comprises at least one of the following materials or consists of at least one of the following materials: polyamide (PA); rayon; polyester; and carbon / thermoplastic composite.

13. The belt (10) according to any one of the preceding claims 1 to 4, wherein, the body comprises bio-based and / or recycled polyurethane, and / or the auxiliary yarn comprises bio-based and / or recycled polymer.

14. The belt (10) according to claim 1 of the preceding claims, wherein, the belt has at least one of the following characteristics: the belt (10) is configured to elastically stretch at least 1.5% in the traveling direction of the belt, so that after the force stretching the belt is removed, the belt will return to its initial length; the load (LASE 2%) at a specific elongation of 2% in the traveling direction of the belt (10) is equal to or greater than 28 kN / m; and the load (LASE 4%) at a specific elongation of 4% in the traveling direction of the belt (10) is equal to or greater than 49 kN / m; the belt is configured to, after the load of 25 kN / m for stretching the belt in the traveling direction of the belt is removed, the belt returns to its initial length; and measured at a temperature of 20 °C in the traveling direction of the belt, the tensile elongation of the belt at break is equal to or greater than 20%.

15. The belt (10) according to claim 14 of the preceding claims, wherein, the belt has at least two of the following characteristics: The belt (10) is configured to elastically stretch by at least 1.5% in the traveling direction of the belt, so that after the force stretching the belt is removed, the belt will return to its initial length; The load (LASE 2%) at a specific elongation of 2% in the traveling direction of the belt (10) is equal to or greater than 28 kN / m; and The load (LASE 4%) at a specific elongation of 4% in the traveling direction of the belt (10) is equal to or greater than 49 kN / m; The belt is configured such that after the load of 25 kN / m for stretching the belt in the traveling direction of the belt is removed, the belt returns to its initial length; And Measured in the traveling direction of the belt at a temperature of 20 °C, the tensile elongation of the belt at break is equal to or greater than 20%.

16. The belt (10) according to claim 14 or 15, wherein, Measured in the traveling direction of the belt at a temperature of 20 °C, the tensile elongation of the belt at break is between 20% and 25%.

17. The belt (10) according to claim 14 or 15, wherein, The belt (10) is configured to elastically stretch within a range between 1.8% and 3.0% in the traveling direction of the belt (10).

18. The belt (10) according to claim 14 or 15, wherein, The load (LASE 2%) at a specific elongation of 2% in the traveling direction of the belt (10) is equal to or less than 50 kN / m.

19. The belt (10) according to claim 14 or 15, wherein, The load (LASE 4%) at a specific elongation of 4% in the traveling direction of the belt (10) is equal to or less than 80 kN / m.

20. The belt (10) according to claim 14 or 15, wherein, The belt is configured such that after the load of 30 kN / m for stretching the belt in the traveling direction of the belt is removed, the belt returns to its initial length.

21. The belt (10) according to claim 1, wherein, The first yarn is the outermost yarn closest to the outer surface (12) of the belt.

22. The belt (10) according to claim 7, wherein, Measured perpendicular to the first direction, the number of the auxiliary yarns (31b, 31c) is in the range between 200 yarns / m and 600 yarns / m.

23. The belt (10) according to claim 11, wherein, The auxiliary yarns (31b, 31c) are arranged to a depth equal to or less than 1.2 mm.

24. The belt (10) according to claim 12, wherein, The polyester is polyethylene terephthalate (PET).

25. The belt (10) according to claim 12 of the foregoing claims, wherein, The auxiliary yarn (31b) comprises at least one of the following materials or consists of at least one of the following materials: Aramid; And Polyethylene naphthalate (PEN).

26. An apparatus comprising the belt (10) according to any one of claims 1 to 25 provided on a bushing roll (100), wherein the bushing roll comprises a bending element (110).

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