Base member for papermaking felt and papermaking felt

Abstract

To provide a base member for a papermaking felt having a seam and a papermaking felt that do not impair workability of bonding a seam loop and suppress formation of a seam mark at a seam part.SOLUTION: A base member for a papermaking felt includes: a fabric with ends including a machine direction yarn that reciprocates in the machine direction and a machine direction-crossing yarn arranged in the machine-crossing direction and woven in the machine direction yarn; a plurality of core wire insertion loops which is formed by folding the machine direction yarn at both ends in the machine direction of the fabric and to which core wires can be inserted; and a plurality of filling yarns arranged in the machine-crossing direction at least in one end of the fabric and between the machine-crossing direction yarn arranged at the outermost end of the fabric and the core wire insertion loop. The fineness of a first filling yarn arranged closest to the core wire insertion loop among the plurality of filling yarns is smaller than the fineness of a second filling yarn arranged closer to the machine-crossing direction yarn than the first filling yarn.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a base member for a papermaking felt and a papermaking felt.

Background Art

[0002] In the press part of the papermaking process, water squeezing of wet paper is mainly performed by a papermaking felt and a pair of press rolls. Generally, since the press part is a continuous device, this papermaking felt also needs to operate continuously. Therefore, the papermaking felt is used as an endless felt forming a ring shape in the press part.

[0003] Generally, an endless papermaking felt and an end-shaped papermaking felt are used for the papermaking felt. Since the endless papermaking felt forms a ring shape, there is no felt joint part, and the shape derived from the joint part is not transferred to the wet paper. On the other hand, when installing the endless papermaking felt in a paper machine, when installing it, a crane or the like is used to remove rolls, roll support members, etc., so in a large paper machine, it is necessary to stop the machine for a long time to perform the installation work.

[0004] On the contrary, an end-shaped papermaking felt is generally a seamed papermaking felt having seam loops for joining at both ends thereof, and it is easy to install in a paper machine. After stopping the paper machine, the seamed papermaking felt is connected to the used papermaking felt or a rope or sling belt passed through the paper machine via a seam felt guiding band pre-attached to the newly installed seamed papermaking felt without removing rolls, roll support members, etc., and is drawn into the paper machine.

[0005] Thereafter, both ends of the installed papermaking felt are butted, a core wire is inserted into the space formed by alternately meshing the seam loops, the papermaking felt is made endless, and the installation work on the machine is completed.

[0006] In this type of seam-attached papermaking felt, the workability of inserting the core wire into the space formed by alternately meshing the seam loops, that is, the joining work of the seam loops, is greatly affected by the form of the seam loops. Further, the joint part (seam part) of the seam loops contacts the wet paper during water squeezing and imparts unevenness called seam marks to the wet paper. The shape of these seam marks is also greatly affected by the form of the seam loops. Furthermore, in the vicinity of the seam loops, the short fibers laminated on the felt tend to fall off easily.

[0007] In order to optimize the form of the seam loops to improve the workability of the joining work, to reduce the seam marks in the seam part, and further to prevent the short fibers in the seam part from falling off, various techniques have been proposed in which the seam loops and their vicinity are devised.

[0008] Patent Document 1 aims to avoid defects such as seam marks by preventing the portion where the weft yarns in the vicinity of the seam loops are woven from becoming convex or concave portions that make the pressure uneven during pressing, and further suppress the twisting of the loops and prevent the flaps from falling off. A seam-attached felt is proposed in which a twisted yarn obtained by twisting two yarn materials is arranged in the weft yarns in the vicinity of the seam loops.

[0009] Patent Document 2 aims to prevent the seam loop joining work from becoming difficult due to a structure in which the root position of the loop is not constant with respect to the entire base member. An adjustment yarn woven in a weaving pattern different from that of the CD yarn material in the base member is independently arranged in each layer of the MD yarn material at the end edge of the CD yarn material in the CD yarn material. A seam-attached felt is proposed.

[0010] Patent Document 3 proposes a seam-attached felt in which the fineness, density, and weave structure of the CD yarn material in the seam loop region are changed for the purpose of improving the non-uniformity of the permeability, compressibility, etc. of the seam-attached felt in the seam loop region.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0012] By the way, typical manufacturing processes of a seam-attached papermaking felt include the following processes. Process 1: A process of alternately meshing the seam loops at both ends of an endless base member with the seam loops at both ends of an end-shaped base member having seam loops arranged at both ends in the machine direction, inserting a core wire into the cylindrical space formed by the seam loops, and preparing an endless base member. Process 2: A process of tension heat setting the endless base member. Process 3: A process of replacing the core wire of the endless base member before needling. Process 4: A process of laminating a film-like material obtained by making short fibers into a film by a card or the like on the endless base member, needling and entangling them to integrate, and preparing a precursor of a seam-attached papermaking felt. Process 5: A process of replacing the core wire of the precursor of the seam-attached papermaking felt. Process 6: A process of chemically treating and tension heat setting the precursor of the seam-attached papermaking felt to prepare a seam-attached felt for papermaking. Process 7: A process of removing the core wire of the seam-attached papermaking felt, cutting the short fibers on both the wet paper side and the roll side of the seam loop part, and forming a flap on the wet paper side of the short fiber layer. Process 8: A process of winding the seam-attached papermaking felt into a roll, packing and storing it.

[0013] Here, since the endless base member for the seam-attached papermaking felt and the seam-attached papermaking felt are heat-set under tension as shown in the above step 2 and step 6, processing is performed to maintain the dimensional stability of the base member itself and the form of the seam loops. However, generally, the completed seam-attached papermaking felt is stored in an endless state, that is, in a form wound into a roll without alternately engaging the seam loops at both ends until it is started to be used at a paper manufacturing company. And during storage at the paper manufacturing company, over time, the forces inherent in the warp threads constituting the seam loops and the weft threads near the seam loops gradually disrupt the arrangement of the seam loops.

[0014] And when the arrangement of the seam loops is disrupted, it becomes difficult to insert and pass the core wire, so the workability of joining the seam loops is impaired. Also, when the arrangement of the seam loops is disrupted, the unevenness of the seam portion becomes large, and as a result, seam marks are likely to occur on the wet paper that comes into contact with the papermaking felt during pressing in use. The seam-attached papermaking felt described in the prior art literature has room for further improvement regarding the above problems.

[0015] Therefore, an object of the present invention is to provide a base member for a papermaking felt having a seam and a papermaking felt in which the workability of joining the seam loops is not impaired and the generation of seam marks at the seam portion is suppressed.

Means for Solving the Problems

[0016] As a result of intensive studies to achieve the above object, the present inventor has found that the filling yarn arranged along the machine cross-direction yarn material arranged at the end edge of the base member for the seam-attached papermaking felt has a relatively large influence on the shape retention characteristics of the seam loops. Furthermore, paying attention to the fineness, type, and weaving method of the filling yarn, and particularly proceeding with the study on the influence during these needling processes, the present invention has been achieved.

[0017] The gist of the present invention is as follows. [1] An endless woven fabric including a machine direction yarn that reciprocates in the machine direction and a machine cross direction yarn that is arranged along the machine cross direction and woven into the machine direction yarn, At both ends of the woven fabric in the machine direction, a plurality of core wire insertion loops formed by folding back the machine direction yarns and through which core wires can be inserted, At at least one end of the woven fabric, including a plurality of filling yarns arranged along the machine cross direction between the machine cross direction yarn arranged at the outermost end of the woven fabric and the core wire insertion loop, A base member for a papermaking felt, wherein the fineness of the first filling yarn arranged closest to the core wire insertion loop among the plurality of filling yarns is smaller than the fineness of the second filling yarn arranged closer to the machine cross direction yarn side than the first filling yarn. [2] The base member for a papermaking felt according to [1], wherein the second filling yarn is adjacent to the first filling yarn. [3] The base member for a papermaking felt according to [1] or [2], wherein the fineness of the first filling yarn is 240 dtex or more and 2,000 dtex or less. [4] The base member for a papermaking felt according to any one of [1] to [3], wherein the fineness of the second filling yarn is 330 dtex or more and 2,090 dtex or less. [5] The base member for a papermaking felt according to any one of [1] to [4], wherein the fineness of the first filling yarn is 90 dtex or more and 1,850 dtex or less smaller than the fineness of the second filling yarn. [6] The base member for a papermaking felt according to any one of [1] to [5], wherein the ratio of the fineness of the second filling yarn to the fineness of the first filling yarn is 105% or more and 195% or less. [7] The base member for a papermaking felt according to any one of [1] to [6], wherein at at least one end of the woven fabric, the plurality of filling yarns are composed of the first filling yarn and the second filling yarn. [8] The base member for a papermaking felt according to any one of [1] to [7], wherein the second filling yarn includes staple yarn and / or multifilament yarn. [9] The base member for a papermaking felt according to any one of [1] to [8], wherein the first filling yarn contains a spun yarn and / or a multifilament yarn.

[10] The base member for a papermaking felt according to any one of [1] to [9], wherein the plurality of filling yarns are woven into the machine direction yarns so as to form a warp double weave.

[11] The machine direction yarns include an upper yarn and a lower yarn that constitute the core wire insertion loop. The warp double weave includes a repeating unit in which each of the plurality of filling yarns passes through the side opposite to the lower yarn side of one upper yarn of the machine direction yarns and passes through the side opposite to the upper yarn side of an adjacent one lower yarn, and adjacent filling yarns do not pass through the side opposite to the lower yarn side of the same upper yarn. The base member for a papermaking felt according to

[10] .

[12] The base member for a papermaking felt according to any one of [1] to

[11] , wherein the woven fabric has a warp and weft double weave or a warp and weft multi - weave.

[13] The woven fabric has a warp n - fold weave. After the machine cross - direction yarn passes between the a - th machine direction yarn and the (a + 1)-th machine direction yarn on the first surface which is one surface of the woven fabric, it passes through the first surface side of the first machine direction yarn from the first surface, and then includes a repetition including passing between the b - th machine direction yarn and the (b + 1)-th machine direction yarn from the first surface, or After the machine cross - direction yarn passes between the a - th machine direction yarn and the (a + 1)-th machine direction yarn from the first surface, it passes through the first surface side of the first machine direction yarn from the first surface, and then includes a repetition including passing through the second surface side which is the other surface of the woven fabric of the n - th machine direction yarn from the first surface, or The machine cross - direction yarn passes through the second surface side of the n - th machine direction yarn from the first surface, passes through the first surface side of the first machine direction yarn from the first surface, and then includes a repetition including passing between the b - th machine direction yarn and the (b + 1)-th machine direction yarn from the first surface. Here, n is an integer of 2 or more, a and b are any integers from 1 to n - 1, and a ≠ b. The base member for a papermaking felt according to any one of [1] to

[11] .

[14] A papermaking felt comprising the base member for a papermaking felt according to any one of [1] to

[13] , and a short fiber layer laminated on the base member for a papermaking felt. [Advantages of the Invention]

[0018] With the above configuration, it is possible to provide a base member for a papermaking felt having a seam and a papermaking felt in which the workability of joining the seam loops is not impaired and the occurrence of seam marks at the seam portion is suppressed. [Brief Description of the Drawings]

[0019]

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Figure 18

Embodiments for Carrying Out the Invention

[0020] Hereinafter, preferred embodiments of the base member for a papermaking felt and the papermaking felt according to the present invention will be described in detail with reference to the drawings.

[0021] <1. Base Member for Papermaking Felt> First, the base member for a papermaking felt according to this embodiment will be described. FIG. 1 is a schematic view of the base member for a papermaking felt according to this embodiment, FIG. 2 is a cross-sectional view in the machine direction showing the seam loop portion of the base member for a papermaking felt shown in FIG. 1, FIG. 3 is a cross-sectional view in the machine direction showing a state where the seam loop portions of the base members for a papermaking felt shown in FIG. 1 are joined together, and FIG. 4 is a cross-sectional view in the cross machine direction for explaining the fabric structure formed by the filling yarns and the machine direction yarns of the base member for a papermaking felt shown in FIG. 1.

[0022] In the figures, the size of each member is emphasized appropriately for ease of explanation, and the actual ratio and size of each member are not shown. Also, in the figures, for ease of explanation, the description of some members is omitted as appropriate. Here, the cross machine direction is also referred to as "CD", and the machine direction is also referred to as "MD".

[0023] The base member 1 for a papermaking felt according to this embodiment shown in FIG. 1 is the base member of the seamed papermaking felt 100 described later, and as shown in FIG. 5, the seamed papermaking felt 100 can be configured by carrying a short fiber layer 60 on the base member 1 for a papermaking felt. The base member 1 for a papermaking felt shown in FIG. 1 has a woven fabric 10, a seam loop portion 20, and filling yarns 30.

[0024] The woven fabric 10 is a belt-shaped member having ends, and as shown in FIG. 2, it is a woven fabric including machine direction yarns (MD yarns) 11A and 11B that reciprocate in the machine direction (MD) and machine cross direction yarns (CD yarns) 13 that are arranged along the machine cross direction (CD) and woven into the MD yarns 11A and 11B. The fabric structure of the woven fabric 10 and the configurations of the MD yarns 11A and 11B and the CD yarns 13 will be described later.

[0025] The seam loop portion 20 is provided at both end portions in the machine direction of the woven fabric 10 and includes a plurality of core wire insertion loops (seam loops) 21. Each seam loop 21 is a loop formed by folding back the MD yarns 11A and 11B of the woven fabric 10. Specifically, the MD yarn 11A extends from the woven fabric 10 and folds back along the thickness direction of the woven fabric 10, that is, perpendicular to the thickness direction of the woven fabric 10 or inclined at a predetermined angle from the thickness direction to the machine transverse direction, and returns to the woven fabric 10 as the MD yarn 11B, thereby forming the seam loop 21. Then, each of the MD yarns 11A and 11B forms the seam loop 21, respectively, and the seam loop portion 20 is formed as a row of a plurality of seam loops 21 along the machine transverse direction at both end portions in the machine direction of the woven fabric 10. Note that the average minimum diameter of each seam loop 21 is not particularly limited, but is, for example, 0.50 mm or more and 4.00 mm or less.

[0026] Since each seam loop 21 basically forms a loop along the thickness direction of the woven fabric 10, a core wire 40 can be inserted into each formed seam loop 21 in the machine transverse direction. Therefore, in the seam loop portion 20, the core wire 40 can be inserted into a plurality of seam loops 21 along the machine transverse direction.

[0027] Then, as shown in FIG. 3, by meshing the seam loops 21 of the seam loop portion 20 at both ends in the machine direction of the base member 1 for the papermaking felt with each other and inserting the core wire 40 into the seam loop 21, a seam portion 50 is formed, and both ends in the machine direction of the base member 1 for the papermaking felt are joined, and as a result, the base member 1 for the papermaking felt becomes annular.

[0028] Here, as a general theory, ideally, as shown in FIG. 10, each seam loop 221 is arranged in alignment along the machine transverse direction, and the seam loop 221 itself is arranged parallel to the thickness direction TD. In such a case, the core wire 240 can be easily inserted into each seam loop 221.

[0029] Since the base member for the papermaking felt and the papermaking felt are subjected to tension heat setting in the manufacturing process, processing is carried out to maintain the dimensional stability of the base member itself and the form of the seam loops. However, the completed papermaking felt is stored in a rolled form, that is, in an endless state, without alternately engaging the seam loops at both ends until it is started to be used by a paper manufacturing company. And during storage in the paper manufacturing company, over time, the forces inherent in the MD yarns constituting the seam loops and the CD yarns near the seam loops gradually disrupt the arrangement of the seam loops.

[0030] For example, as shown in FIGS. 11 and 12, each of the seam loops 221A and 221B may be inclined with respect to the thickness direction TD. Also, as shown in FIG. 13, each of the seam loops 221C may not be along the machine transverse direction and may be displaced in the thickness direction. In many cases, these events occur simultaneously. And when such inclinations of the seam loops 221A and 221B and displacements of the positions of the seam loops 221C occur, it becomes difficult to alternately engage the seam loops 221A, 221B, and 221C at both ends, and for reasons such as the insertion resistance of the core wire 240 increasing, it becomes difficult to insert the core wire 240 through the space formed by engaging the seam loops 221A, 221B, and 221C.

[0031] Thus, when the arrangement of the seam loops collapses, the insertion and penetration of the core wire become difficult, so the workability of joining the seam loops is impaired. Also, due to the collapse of the arrangement of the seam loops, the unevenness of the seam portion increases, and as a result, seam marks are likely to occur on the wet paper that contacts the papermaking felt during pressing in use.

[0032] However, in the base member 1 for the papermaking felt according to the present embodiment, the arrangement of the seam loops 21 in the seam loop portion 20 is suppressed from collapsing by the filling yarns 30 described below.

[0033] As shown in FIG. 1, the filling yarn 30 is disposed along the machine transverse direction between the CD yarn 13 and the seam loop 21 disposed at the outermost ends of the woven fabric 10 at both ends in the machine direction of the woven fabric 10. As shown in FIGS. 1 and 2, in the present embodiment, the filling yarn 30 includes a filling yarn (first filling yarn) 31 disposed on the seam loop 21 side and a filling yarn (second filling yarn) 32 disposed on the CD yarn side, and is composed of two filling yarns. The filling yarns 31 and 32 are respectively woven into the MD yarns 11A and 11B constituting the seam loop 21.

[0034] By disposing the filling yarn 30 near the seam loop portion 20 in this way, the positions of the MD yarns 11A and 11B, particularly the positions in the thickness direction, can be fixed, and thus the positions of the respective seam loops 21 can be fixed. Thereby, it is possible to suppress the arrangement of the seam loops 21 from being disrupted.

[0035] In addition, in the papermaking felt 100 described later, the seam loop portions 20 are joined to each other to form a seam portion 50, and the papermaking felt 100 is formed into an annular shape. Since there is no CD yarn in the vicinity of the seam portion 50, the short fibers in the short fiber layer 60 are difficult to be fixed, and the short fibers tend to be detached when the papermaking felt 100 is used. However, the filling yarn 30 disposed near the seam portion 50 can preferably fix the short fibers and prevent the short fibers from detaching from the short fiber layer 60.

[0036] Furthermore, the papermaking felt 100 is repeatedly pressed together with the wet paper by a press roll or a press shoe in the press part. The filling yarn 30 can fix the positions of the respective seam loops 21, and the unevenness inevitably generated in the seam portion 50 can be made relatively small. As a result, it is possible to suppress the occurrence of a pressing mark corresponding to the seam portion 50, that is, a so-called seam mark, on the wet paper that contacts the papermaking felt during pressing during use.

[0037] In this embodiment, the fineness of the filling yarn 31 disposed on the side of the seam loop 21 is smaller than the fineness of the filling yarn 32 disposed on the side of the CD yarn 13. As a result, the filling yarn 30 can fully exhibit each of the functions of the filling yarn 30 described above. As a result, the base member 1 for the papermaking felt is not impaired in workability for joining the seam loop portion 20, and the occurrence of seam marks at the seam portion 50 is suppressed.

[0038] Specifically, the filling yarn 31 disposed on the side of the seam loop 21 has only the filling yarn 32 disposed on the side of the CD yarn 13, and has a low degree of fixation and a high degree of freedom. On the other hand, the filling yarn 32 disposed on the side of the CD yarn 13 is sandwiched between the filling yarn 31 and the CD yarn 13, has a high degree of fixation, and has a low degree of freedom.

[0039] When manufacturing the papermaking felt 100, a film-like material made of short fibers by a card or the like is laminated on the base member 1 for the papermaking felt, needled, and intertwined and integrated to form a short fiber layer (felt layer) 60.

[0040] Here, the inventors of the present invention have found that if the fineness of the filling yarn 31 and the fineness of the filling yarn 32 are of the same degree, the needle punching effect of the seam portion 50 in needling is greater for the filling yarn 31 disposed on the side of the seam loop 21 than for the filling yarn 32 disposed on the side of the CD yarn 13. This is presumably because the filling yarn 31 disposed on the side of the seam loop 21 is not fixed by other yarns, such as the CD yarn 13, etc., more than the filling yarn 32 disposed on the side of the CD yarn 13. As a result, in this case, during needling, the shrinkage amount of the filling yarn 31 disposed on the side of the seam loop 21 becomes larger than the shrinkage amount of the filling yarn 32 disposed on the side of the CD yarn 13 due to needling.

[0041] In this case, the balance of the forces received from the filling yarns 31 and 32 by the MD yarns 11A and 11B woven into the filling yarn 31 and the MD yarns 11A and 11B woven into the filling yarn 32 is disrupted and becomes different, resulting in a disorder in the arrangement of the seam loops 21. As a result, the effects of the filling yarn 30 described above are not fully exerted.

[0042] On the other hand, as described above, in the present embodiment, the fineness of the filling yarn 31 disposed on the seam loop 21 side is smaller than the fineness of the filling yarn 32 disposed on the CD yarn 13 side. Thereby, the needle punching effect during needling can be made the same level with the filling yarns 31 and 32, and it becomes possible to appropriately adjust the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31 and 32. As a result, the filling yarn 30 can fully exhibit each function of the filling yarn 30 described above.

[0043] The fineness of the filling yarn (first filling yarn) 31 disposed on the seam loop 21 side is not particularly limited. For example, it is 240 dtex or more and 2,000 dtex or less, preferably 900 dtex or more and 1,400 dtex or less, and more preferably 1,000 dtex or more and 1,300 dtex or less. Thereby, the needle punching effect by needling can be moderately obtained to the necessary degree.

[0044] The fineness of the filling yarn (second filling yarn) 32 disposed on the CD yarn 13 side is not particularly limited. For example, it is 330 dtex or more and 2,090 dtex or less, preferably 1,400 dtex or more and 1,900 dtex or less, and more preferably 1,500 dtex or more and 1,800 dtex or less. Thereby, the needle punching effect by needling can be fully obtained.

[0045] Also, the fineness of the filling yarn (first filling yarn) 31 may be smaller than that of the filling yarn (second filling yarn) 32, for example, 90 dtex or more and 1,850 dtex or less, preferably 250 dtex or more and 1,000 dtex or less, more preferably 400 dtex or more and 700 dtex or less. Thereby, the needle punching effect and the shrinkage amount by needling can be made the same for the filling yarn (first filling yarn) 31 and the filling yarn (second filling yarn) 32, and the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31 and 32 can be adjusted more appropriately.

[0046] Also, the ratio of the fineness of the filling yarn (first filling yarn) 31 to the fineness of the filling yarn (second filling yarn) 32 (fineness of the second filling yarn / fineness of the first filling yarn) is, for example, 105% or more and 195% or less, preferably 120% or more and 180% or less, more preferably 130% or more and 170% or less. Thereby, the needle punching effect and the shrinkage amount by needling can be made the same for the filling yarn (first filling yarn) 31 and the filling yarn (second filling yarn) 32, and the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31 and 32 can be adjusted more appropriately.

[0047] Also, in the present embodiment, the filling yarn 30 is composed of two filling yarns, the filling yarn 31 and the filling yarn 32. Thus, by reducing the number of the filling yarns 30, the generation of seam marks can be suppressed more. Also, the arrangement of the seam loops 21 can be made more appropriate.

[0048] In addition, each yarn (in this embodiment, filling yarns 31 and 32) that constitutes the filling yarn 30 is woven into the MD yarns 11A and 11B. FIG. 4 is a cross-sectional view in the machine transverse direction for explaining the fabric structure formed by the filling yarns 31 and 32 and the MD yarns 11A and 11B of the base member 1 for a papermaking felt shown in FIG. 1. As shown in FIG. 4, in this embodiment, the filling yarn 31 and the filling yarn 32 form a warp double weave with the filling yarn 31 and 32 as weft yarns, the MD yarn 11A as the upper warp yarn, and the MD yarn 11B as the lower warp yarn. By forming a warp double weave with the filling yarn 30 and the MD yarns 11A and 11B in this way, the MD yarns 11A and 11B can be fixed by the filling yarn 30, and it becomes easy to fix the arrangement of the seam loops 21.

[0049] In addition, each of the filling yarn 31 and the filling yarn 32 has a repeating unit in which it passes through the upper side (opposite side to the MD yarn 11B) of one MD yarn 11A in the figure and passes through the lower side (opposite side to the MD yarn 11A) of an adjacent MD yarn 11B. And adjacent filling yarns 31 and 32 do not pass through the upper side (opposite side to the MD yarn 11B) of the same MD yarn 11A in the figure. That is, the adjacent filling yarns 31 and 32 of the filling yarn 30 are out of phase and alternately pass through the upper side of the MD yarn 11A in the figure. The fabric structure formed by the filling yarn 30 and the MD yarns 11A and 11B can be expressed as a 1 / 1 1 / 1 warp double weave according to the definition described later. Thereby, the MD yarns 11A and 11B can be firmly fixed by the filling yarn 30, and the arrangement of the seam loops 21 can be more firmly fixed.

[0050] Each yarn (filling yarn 31 and filling yarn 32) that constitutes the filling yarn 30 can be any form of yarn, such as a spun yarn, a filament yarn, a composite twisted yarn containing two or more spun yarns, or a composite twisted yarn containing one or more spun yarns and one or more filament yarns. The forms of the yarns that constitute the filling yarn 30 may be the same or different.

[0051] A spun yarn (spinning yarn) is a yarn obtained by spinning using staple fibers. The spun yarn is easily entangled with the staple fibers constituting the staple fiber layer 60 and other yarns, such as MD yarns 11A and 11B, in the process of forming the staple fiber layer 60, and contributes to preventing the staple fibers from falling off from the staple fiber layer 60 and fixing the arrangement of the seam loops 21.

[0052] The staple fibers constituting the spun yarn can have an average fiber length of, for example, 20 mm or more and 300 mm or less, preferably 50 mm or more and 200 mm or less. The average fineness of the staple fibers constituting the spun yarn is not particularly limited, but can be, for example, 1.0 dtex or more and 20 dtex or less, preferably 2.0 dtex or more and 15 dtex or less.

[0053] The fineness of the spun yarn is not particularly limited when it is used as each yarn (filling yarn 31 and filling yarn 32) constituting the filling yarn 30 itself, but can be, for example, 240 dtex or more and 2,090 dtex or less, preferably 1,000 dtex or more and 2,000 dtex or less. When the spun yarn is used as a material for a complex twisted yarn, the fineness of the spun yarn is not particularly limited, but can be, for example, 200 dtex or more and 1,850 dtex or less, preferably 800 dtex or more and 1,850 dtex or less.

[0054] Examples of the filament yarn include a multi-filament or mono-filament twisted yarn, a multi-filament and / or mono-filament aligned yarn, and a mono-filament single yarn.

[0055] Here, in this specification, "multi-filament" is a filament composed of two or more single yarns. Usually, the single yarns constituting the multi-filament have a fineness that cannot be used alone as the yarn of the base member 1 for the papermaking felt. Specifically, the fineness of the single yarns constituting the multi-filament is, for example, less than 100 dtex, preferably 5 dtex or more and 50 dtex or less.

[0056] Here, a monofilament is a filament consisting of a single strand. Usually, the single yarns that make up the monofilament have a fineness that can be used alone as the yarn of the base member 1 for the papermaking felt. The fineness of the monofilament is, for example, 100 dtex or more and 2,250 dtex or less, preferably 200 dtex or more and 2,250 dtex or less.

[0057] Also, "twisted yarn of multifilament or monofilament" refers to a twisted yarn using a multifilament or monofilament as the raw yarn. Further, "aligned yarn of multifilament or monofilament" refers to a yarn in which a plurality of single yarns constituting the above-mentioned multifilament or monofilament are aligned as the raw yarn.

[0058] When used as an aligned yarn of multifilament or monofilament, the aligned yarn can be obtained by aligning the raw yarn so that the resulting multifilament yarn has, for example, the desired fineness. In this case, the fineness of the single yarns that make up the multifilament raw yarn is preferably 5 dtex or more and less than 100 dtex, more preferably 5 dtex or more and 50 dtex or less. Also, the fineness of the monofilament raw yarn is preferably 100 dtex or more and 1,000 dtex or less, more preferably 100 dtex or more and 500 dtex or less.

[0059] When using multifilament or monofilament twisted yarns, either balanced or unbalanced twisted yarns can be used. In the case of balanced twisting, for example, a plurality of raw yarns are aligned so that the count is 240 dtex or more and 2,090 dtex or less, preferably 400 dtex or more and 1,000 dtex or less, and the aligned raw yarns are twisted. Then, a plurality of, for example, 2 to 10 strands of the twisted and aligned raw yarns are aligned and further twisted to obtain a balanced multifilament or monofilament twisted yarn having a target fineness. In this case, the number of twists of the lower twist is not particularly limited, but is, for example, 0.05 turns / cm or more and 10.0 turns / cm or less, preferably 0.1 turns / cm or more and 5.0 turns / cm or less. Also, the number of twists of the upper twist is not particularly limited, but is, for example, 0.05 turns / cm or more and 10.0 turns / cm or less, preferably 0.1 turns / cm or more and 5.0 turns / cm or less.

[0060] In the case of unbalanced twisting, a plurality of raw yarns are aligned so as to have a target fineness, and the aligned raw yarns are twisted to obtain an unbalanced multifilament or monofilament twisted yarn. In this case, the number of twists is not particularly limited, but is, for example, 0.05 turns / cm or more and 20.0 turns / cm or less, preferably 0.1 turns / cm or more and 10.0 turns / cm or less.

[0061] When using twisted yarns, the fineness of the single filaments constituting the multifilament raw yarn is preferably 5 dtex or more and less than 100 dtex, more preferably 5 dtex or more and 50 dtex or less. Also, the fineness of the monofilament raw yarn is preferably 150 dtex or more and 1,500 dtex or less, more preferably 200 dtex or more and 1,000 dtex or less.

[0062] Further, each yarn (the first filling yarn 31 and the second filling yarn 32) constituting the filling yarn 30 may be appropriately processed. Examples of such processing include drawing processing and crimping processing.

[0063] In addition, the composite twisted yarn contains two or more spun yarns (spinning yarns) and / or filament yarns. Specifically, examples include composite twisted yarns of two or more spun yarns (spinning yarns), composite twisted yarns of one or more multifilament yarns and one or more monofilament yarns, composite twisted yarns of one or more spun yarns and one or more monofilament yarns, composite twisted yarns of one or more spun yarns and one or more multifilament yarns, and composite twisted yarns of one or more spun yarns, one or more monofilament yarns, and one or more multifilament yarns. When a plurality of spun yarns are used in the composite twisted yarn, they may be the same or different. Similarly, when a plurality of filament yarns are used in the composite twisted yarn, they may be the same or different.

[0064] In this case, a plurality of raw yarns (spun yarns, multifilament yarns, monofilament yarns) are aligned so as to achieve the target fineness, and the aligned raw yarns are twisted to obtain a composite twisted yarn. In this case, the number is not particularly limited, but for example, it is 0.05 turns / cm or more and 20.0 turns / cm or less, preferably 0.1 turns / cm or more and 10.0 turns / cm or less.

[0065] Among the above, each yarn constituting the filling yarn 30 is preferably a yarn containing a spun yarn and / or a multifilament yarn, more preferably a composite twisted yarn of one or more spun yarns and one or more multifilament yarns, a composite twisted yarn obtained by twisting two or more spun yarns together, or a spun yarn. Thereby, the arrangement of the seam loops 21 of the base member 1 for the papermaking felt can be more appropriately aligned, contributing to the improvement of the joining workability of the seam loop portion 20, and more reliably preventing the dropping of short fibers in the vicinity of the seam portion 50.

[0066] In particular, the first filling yarn is preferably a yarn containing staple yarn and / or multifilament yarn, more preferably staple yarn, a composite twisted yarn formed by twisting two or more staple yarns together, or a composite twisted yarn of one or more staple yarns and one or more multifilament yarns, and even more preferably staple yarn or a composite twisted yarn formed by twisting two or more staple yarns together. This can more appropriately align the arrangement of the seam loops 21 of the base member 1 for the papermaking felt, contribute to the improvement of the joining workability of the seam loop portion 20, and more reliably prevent the shedding of short fibers in the vicinity of the seam portion 50.

[0067] In particular, the second filling yarn is preferably a yarn containing staple yarn and / or multifilament yarn, more preferably staple yarn, a composite twisted yarn formed by twisting two or more staple yarns together, or a composite twisted yarn of one or more staple yarns and one or more multifilament yarns, and even more preferably a composite twisted yarn of one or more staple yarns and one or more multifilament yarns. This can more appropriately align the arrangement of the seam loops 21 of the base member 1 for the papermaking felt, contribute to the improvement of the joining workability of the seam loop portion 20, and more reliably prevent the shedding of short fibers in the vicinity of the seam portion 50.

[0068] The material constituting each yarn of the filling yarn 30 is not particularly limited. For example, polyester (such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), aliphatic polyamide (such as polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, polypropylene, polyether ether ketone, polytetrafluoroethylene, polyethylene, wool, cotton, metal, etc. can be used alone or in combination of two or more. Also, each yarn (the first filling yarn 31 and the second filling yarn 32) constituting the filling yarn 30 may be constituted by any two or more of these by the same material, or may be constituted by different materials from each other.

[0069] Among the above, each yarn (the first filling yarn 31 and the second filling yarn 32) constituting the filling yarn 30 preferably contains one or more selected from the group consisting of polyester, aliphatic polyamide, and aromatic polyamide (aramid), more preferably polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, and polyamide 612. Thereby, the arrangement of the seam loops 21 becomes easy to align. Also, the strength near the seam portion 50 is sufficiently maintained, and its dimensional stability is improved.

[0070] Next, the configuration of the woven fabric 10 will be described. In the present embodiment, the fabric texture of the woven fabric 10 is a so-called 3 / 1 1 / 3 warp double texture. In such a texture, a force uniform in the machine transverse direction is applied to the MD yarns 11A and 11B, and the MD yarns 11A and 11B are less likely to shift in the machine transverse direction. As a result, the seam loops 21 formed by the MD yarns 11A and 11B are less likely to tilt, and the arrangement of the seam loops 21 can be more reliably fixed.

[0071] In this specification, when viewed from one side of the woven fabric, for a point where a certain MD yarn and a CD yarn intersect in the machine direction from the seam loop side toward the woven fabric, if the continuous observation of the MD yarn is made a times and then the continuous observation of the CD yarn is made b times, the repetition is denoted as a / b. In this case, the MD yarn passes over a CD yarns and then repeats the floating and sinking of passing under b CD yarns. Also, in the repetition of the texture, if the MD yarn is observed c times and the CD yarn is observed d times after the continuous observation of the CD yarn b times, the notation of the repetition is a / b / c / d. In this case, the MD yarn passes over a CD yarns, under b CD yarns, over c CD yarns, and finally repeats the floating and sinking of passing under d CD yarns.

[0072] When there are multiple layers of warp threads, when viewed from one side of the woven fabric, the above notations are indicated from the surface side with a blank space in between. For example, for the woven fabric 10 described in FIG. 2, regarding the MD thread 11A, there is a repetition where the MD thread 11A is observed 3 times and then the CD thread 13 is observed once, and it is denoted as 3 / 1. Also, regarding the MD thread 11B, there is a repetition where the MD thread 11B is observed once and then the CD thread 13 is observed 3 times, and it is denoted as 1 / 3. Therefore, the fabric structure of the woven fabric 10 is denoted as 3 / 1 1 / 3. Also, when the same notation is continuous in a multi-layer fabric, the repeated notation can be omitted. For example, in the case of a warp double fabric denoted as 1 / 1 1 / 1, it can be denoted as 1 / 1 warp double fabric.

[0073] Also, the MD threads 11A, 11B and the CD thread 13 can be threads in any form, for example, twisted yarns of multifilament or monofilament, aligned yarns of multifilament and / or monofilament, and single yarns of monofilament, etc. are mentioned. Also, similar to the filling yarn 30, for example, it can be a spun yarn and / or a filament yarn, or a composite twisted yarn containing two or more kinds of spun yarns and / or filament yarns.

[0074] From the viewpoint of ensuring the strength of the papermaking felt 100 and the base member 1 for the papermaking felt and the strength of the loops, it is preferable that the MD threads 11A, 11B and the CD thread 13 all contain filament yarns. Note that the MD threads 11A, 11B and the CD thread 13 may be threads in different forms or in the same form. Also, the MD thread 11A may be composed of threads in the same or multiple forms, the MD thread 11B may be composed of threads in the same or multiple forms, and the CD thread 13 may be composed of threads in the same or multiple forms.

[0075] Among those described above, it is preferable that the MD yarns 11A and 11B contain monofilaments for the purpose of improving the strength of the seam loop 21, and it is preferable that they contain twisted monofilaments for the purpose of preventing the shedding of staple fibers in the seam loop portion 20 and the seam portion 50.

[0076] Among those described above, it is preferable that the CD yarn 13 contains monofilaments for the purpose of ensuring the water permeability of the papermaking felt 100, and it is preferable that it contains twisted monofilaments for the purpose of preventing the shedding of staple fibers in the papermaking felt 100.

[0077] The fineness of the MD yarns 11A and 11B and the CD yarn 13 is not particularly limited, but is 500 dtex or more and 3000 dtex or less, preferably 700 dtex or more and 2000 dtex or less, more preferably 800 dtex or more and 1500 dtex or less. Thereby, the rigidity of the base member 1 for the papermaking felt can be made sufficient.

[0078] Also, the materials constituting the MD yarns 11A and 11B and the CD yarn 13 are not particularly limited, and for example, the materials listed for the filling yarn 30 described above can be used alone or in combination of two or more. Two or more of the MD yarns 11A and 11B and the CD yarn 13 may be constituted by the same material, or may be constituted by different materials from each other.

[0079] Among those described above, the MD yarns 11A and 11B and the CD yarn 13 preferably contain one or more selected from the group consisting of polyester, aliphatic polyamide, and aromatic polyamide (aramid), and more preferably polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, and polyamide 612. Thereby, the rigidity of the base member 1 for the papermaking felt can be made sufficient.

[0080] The thread densities of the MD threads 11A and 11B and the CD thread 13 are not particularly limited and can be set as appropriate. The total thread density of the MD threads 11A and 11B is, for example, 30 threads / 5 cm to 200 threads / 5 cm, preferably 60 threads / 5 cm to 120 threads / 5 cm. Also, the thread density of the CD thread 13 is, for example, 20 threads / 5 cm to 200 threads / 5 cm, preferably 30 threads / 5 cm to 120 threads / 5 cm.

[0081] The thickness of the base member 1 for the papermaking felt described above is not particularly limited and can be, for example, 0.2 mm or more and 3.5 mm or less, preferably 0.5 mm or more and 3.0 mm or less. Also, the basis weight of the base member 1 for the papermaking felt is not particularly limited and can be, for example, 150 g / m 2 or more and 1,200 g / m 2 or less, preferably 300 g / m 2 or more and 1,000 g / m 2 or less.

[0082] The fabric structure, thickness, and basis weight of the base member 1 for the papermaking felt are appropriately set according to the intended properties such as the strength, porosity, and air permeability of the papermaking felt 100 and the markability of the base member 1 for the papermaking felt.

[0083] The dimensions of the base member 1 for the papermaking felt as described above are not particularly limited and are set, for example, according to the dimensions of the paper machine.

[0084] The base member 1 for the papermaking felt described above includes an endless woven fabric 10 containing MD threads 11A and 11B and a CD thread 13, seam loops 21 formed by folding back the MD threads 11A and 11B at both end portions in the machine direction of the woven fabric 10, and a plurality of filling threads 30 (filling threads 31 and 32) arranged between the CD thread 13 and the seam loops 21 disposed at the outermost ends of the woven fabric 10 at both end portions in the machine direction of the woven fabric 10. Also, the fineness of the filling thread 31 disposed on the seam loop 21 side is smaller than the fineness of the filling thread 32 disposed on the CD thread 13 side with respect to the filling thread 31.

[0085] As a result, during needling when the short fiber layer 60 is laminated, the needle punching effects received by the filling yarns 31 and 32 can be made the same, and it becomes possible to appropriately adjust the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31 and 32. For this reason, it is possible to suppress the occurrence of disorder in the arrangement of the seam loops 21. And as a result, the filling yarns 31 and 32 can sufficiently exhibit the intended effects, the base member 1 for the papermaking felt is not impaired in the workability of joining the seam loop portion 20, and the occurrence of seam marks derived from the seam portion 50 during pressing is suppressed.

[0086] <2. Papermaking felt> Next, the papermaking felt according to the present embodiment will be described. FIG. 5 is a cross-sectional view in the machine direction near the seam portion of the papermaking felt according to the present embodiment. As shown in FIG. 5, the papermaking felt 100 according to the present embodiment includes a base member 1 for the papermaking felt and a short fiber layer 60 laminated on the base member 1 for the papermaking felt.

[0087] The short fiber layer 60 includes a wet paper side surface layer 61 laminated on the side of the base member 1 for the papermaking felt that becomes the wet paper contact side of the papermaking felt 100, a wet paper side inner layer 62 disposed in the woven fabric 10 of the base member 1 for the papermaking felt, and a roll side layer 63 laminated on the side of the papermaking felt 100 that becomes the roll contact side.

[0088] And near the seam portion 50 of the short fiber layer 60, a flap 64 as a cut is formed along the machine transverse direction, and the short fiber layer 60 is discontinuous at the flap 64. As a result, when the core wire 40 is removed from the seam portion 50, the short fiber layer 60 also becomes an open-ended shape together with the base member 1 for the papermaking felt, and as a result, the papermaking felt 100 becomes an open-ended shape. On the other hand, when mounting on the paper machine, by meshing the seam loop portions 20 of the open-ended papermaking felt 100 with each other and inserting the core wire 40, the seam portion 50 is formed and the papermaking felt 100 becomes annular.

[0089] The material of the short fibers constituting each layer of the short fiber layer 60 is not particularly limited, and polyester (such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), aliphatic polyamide (such as polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, polypropylene, polyether ether ketone, polytetrafluoroethylene, polyethylene, wool, cotton, metal, etc. can be used alone or in combination of two or more. Among the above-mentioned ones, from the viewpoints of abrasion resistance, compression recovery, impact resistance, hydrophilicity, hydrolysis resistance, chemical resistance, etc., polyamide is preferable as the material of the short fibers.

[0090] The fineness of the short fibers constituting the wet paper side surface layer 61 is not particularly limited, but for example, it is 0.1 dtex or more and 200 dtex or less. Also, the fineness of the short fibers constituting the wet paper side inner layer 62 is not particularly limited, but for example, it is 3 dtex or more and 200 dtex or less. Note that the fineness of the short fibers constituting the wet paper side surface layer 61 may be the same as or different from the fineness of the short fibers constituting the wet paper side inner layer 62. Also, not limited to the illustrated embodiment, the wet paper side surface layer 61 and the wet paper side inner layer 62 may be an integrated same layer.

[0091] The total basis weight of the wet paper side surface layer 61 and the wet paper side inner layer 62 is, in total, 100 g / m 2 or more and 1,500 g / m 2 or less, preferably 300 g / m 2 or more and 1,200 g / m 2 or less, more preferably 400 g / m 2 or more and 1,000 g / m 2 or less. The fineness and basis weight of the short fibers of the wet paper side surface layer 61 and the wet paper side inner layer 62 are appropriately set according to the intended properties such as the strength, porosity, and air permeability of the forming fabric 100 and the surface property of the short fiber layer of the wet paper side surface layer 61.

[0092] Also, the fineness of the short fibers constituting the roll side layer 63 is not particularly limited, but for example, it is 3 dtex or more and 150 dtex or less. Also, the basis weight of the short fibers on the roll side surface is not particularly limited, but for example, it can be 50 g / m 2 or more and 500 g / m 2 or less.

[0093] The basis weight of the papermaking felt 100 is not particularly limited, but for example, as a whole, it is 250 g / m 2 or more and 3000 g / m 2 or less, preferably 400 g / m 2 or more and 2000 g / m 2 or less. Also, the thickness of the papermaking felt 100 is not particularly limited, but for example, it is 1 mm or more and 6 mm or less, preferably 2 mm or more and 4 mm or less.

[0094] The papermaking felt 100 described above can be obtained by laminating short fibers formed into a film shape by a card or the like on both sides of the base member 1 for the papermaking felt. Specifically, first, a film-shaped material obtained by making short fibers into a film shape by a card or the like is laminated on the base member 1 for the papermaking felt, and needled to be intertwined and integrated, and the short fiber layer 60 is laminated on the base member 1 for the papermaking felt. Thereby, a precursor of the papermaking felt 1 is completed. Next, the precursor of the papermaking felt 1 is appropriately subjected to chemical treatment, heat setting, and press working, the core wire is removed, and the short fibers of the seam loop portion 20 are cut to create the flap 64, whereby the papermaking felt 1 is obtained. Note that the papermaking felt 100 is wound into a roll shape, for example, and packed and stored before use.

[0095] The papermaking felt 100 described above includes the base member 1 for the papermaking felt. Therefore, the disorder of the arrangement of the seam loops 21 of the papermaking felt 100 is suppressed. For example, even in a situation where the papermaking felt 100 is packed and stored in a paper manufacturing company for a long time, the disorder of the arrangement of the seam loops 21 is suppressed. Therefore, the workability when joining the seam loops 21 is good.

[0096] Furthermore, since the disorder of the arrangement of the seam loops 21 is suppressed, the generation of seam marks on the wet paper that contacts the papermaking felt 100 during use and pressing is suppressed. Also, since the disorder of the arrangement of the seam loops 21 is suppressed, the shedding of short fibers from the short fiber layer 60 is preferably suppressed.

[0097] <3. Modification Example> Next, some modification examples of the base member for the papermaking felt and the papermaking felt according to the above-described embodiment will be described. Hereinafter, the description will focus on the differences from the above-described embodiment, and the description of the same matters will be omitted. Also, the modification examples described below and the features of the above-described embodiment may be applied individually, or may be applied in combination of two or more as long as technically acceptable.

[0098] (3.1. First Modification Example) In the above-described embodiment, an example in which two filling yarns 31 and 32 are arranged at each end of the base member 1 for the papermaking felt has been described. However, the present invention is not limited to this, and the base member for the papermaking felt can have three or more filling yarns at each end. An example is shown in FIG. 6.

[0099] FIG. 6 is a cross-sectional view in the machine direction showing a part of the base member for the papermaking felt according to a modification example of the present invention. The base member 1A for the papermaking felt shown in FIG. 6 has a different number of filling yarns 30A compared to the above-described base member 1 for the papermaking felt, and is the same in other respects. Hereinafter, the filling yarn 30A will be described in detail, and the description of the same matters will be omitted.

[0100] As shown in FIG. 6, in the machine direction end portion of the base member 1A for the papermaking felt, three filling yarns 30A (filling yarns 31A, 32A, 33A) are arranged along the machine cross direction between the seam loop portion 20 and the CD yarn 13. And the fineness of the filling yarn 31A arranged on the seam loop 21 side is smaller than the fineness of the filling yarn 32A and / or the filling yarn 33A arranged on the CD yarn 13 side. In this case, the filling yarn 31A is the first filling yarn, and the filling yarn 32A and / or the filling yarn 33A is the second filling yarn.

[0101] Thereby, the needling effect by needling can be made uniform within the filling yarn 30A, and it becomes possible to appropriately adjust the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31A, 32A, and 33A. For this reason, it is possible to suppress the occurrence of disorder in the arrangement of the seam loops 21. And as a result, the filling yarns 31A, 32A, and 33A can sufficiently exhibit the intended effect, and the workability of joining the seam loop portion 20 of the base member 1A for the papermaking felt is not impaired, and the generation of seam marks due to the formed seam portion is suppressed.

[0102] Note that it is sufficient that the fineness of either of the filling yarns 32A and 33A is larger than the fineness of the filling yarn 31A, but it is preferable that the fineness of the filling yarn 31A is smaller than the fineness of the filling yarn 32A adjacent to the filling yarn 31A. Thus, since the fineness of the filling yarn 32A adjacent to the filling yarn 31A as the first filling yarn is large, the above-described effect can be obtained more reliably. Also, within the filling yarn 30A, it is preferable that the fineness of each of the filling yarns 31A and 32A is smaller than the fineness of the filling yarns 32A and 33A on the adjacent CD yarn 13 side.

[0103] Note that the present invention is not limited to the above-described embodiment and the modification shown in FIG. 6, and the number of filling yarns can be any number. For example, at one end of the base member for the papermaking felt, two or more and ten or less, preferably two or more and five or less filling yarns may be arranged. Also, in the above-described embodiments and the modified examples shown in FIG. 6, a plurality of filling yarns 30 and 30A are arranged at both ends of the woven fabric 10, and it has been described as satisfying the relationship between the first filling yarn and the second filling yarn. However, the present invention is not limited to this. For example, the relationship between the first filling yarn and the second filling yarn may be satisfied only at one end of the woven fabric, or there may be only one filling yarn at one end of the woven fabric.

[0104] (3.2. Fabric structure of the woven fabric) In the above-described embodiment, the woven fabric 10 of the base member 1 for the papermaking felt has been described as having a 3 / 1 1 / 3 warp double weave. However, the present invention is not limited to this, and the woven fabric can have any fabric structure.

[0105] The fabric structure of the woven fabric of the base member for the papermaking felt is not particularly limited as described above. Examples include warp double weaves such as 3 / 1 1 / 3 warp double weave, 5 / 1 1 / 1 warp double weave, 2 / 1 1 / 2 warp double weave (2 / 1 1 / 2 warp 1.5-ply weave), 5 / 1 / 1 / 1 1 / 5 / 1 / 1 warp double weave, etc.; weft double weaves such as 3 / 1 1 / 3 weft double weave, 5 / 1 1 / 1 weft double weave, 2 / 1 1 / 2 weft double weave, etc.; warp and weft double weaves such as 1 / 1 warp and weft double weave; and double weaves represented by these, as well as triple or more multi-layer structures.

[0106] As described above, any fabric structure may be used as the fabric structure of the woven fabric of the base member for the papermaking felt. Hereinafter, the relationship between the fabric structure and the arrangement of the seam loops will be described. FIGS. 7 to 9 are cross-sectional views in the machine transverse direction for explaining the fabric structure of the woven fabric of the base member for the papermaking felt according to a modified example of the present invention. Any of the woven fabrics 10B to 10H in FIGS. 7 to 9 has an n-ply two-layer or multi-layer structure, and the woven fabrics 10B to 10H form a first surface 15 and a second surface 17. Also, n is an integer of 2 or more.

[0107] The woven fabric 10B shown in Fig. 7 has a repetition including a pattern (Pattern I-1) in which the CD yarn 13 passes between the a-th MD yarn 11 and the (a + 1)-th MD yarn 11 from the first surface 15 of the woven fabric 10B, then passes through the first surface 15 side of the first MD yarn from the first surface 15, and then passes between the b-th MD yarn 11 and the (b + 1)-th MD yarn 11 from the first surface 15. In Fig. 7, a and b are arbitrary integers of 1 or more and n - 1 or less, and a ≠ b.

[0108] The woven fabric 10C shown in Fig. 7 has a repetition including a pattern (Pattern I-2) in which the CD yarn 13 passes between the a-th MD yarn 11 and the (a + 1)-th MD yarn 11 from the first surface 15 of the woven fabric 10C, then passes through the first surface 15 side of the first MD yarn from the first surface 15, and then passes through the second surface 17 side of the n-th MD yarn 11 from the first surface 15.

[0109] The woven fabric 10D shown in Fig. 7 has a repetition including a pattern (Pattern I-3) in which the CD yarn 13 passes through the second surface 17 side of the n-th MD yarn 11 from the first surface 15 of the woven fabric 10D, then passes through the first surface 15 side of the first MD yarn from the first surface 15, and then passes between the b-th MD yarn 11 and the (b + 1)-th MD yarn 11 from the first surface 15.

[0110] In the woven fabrics 10B to 10D of Patterns I-1 to I-3 shown in Fig. 7, the CD yarn 13 folds back the MD yarn 11 above the center of the drawing in the figure, but the angle of the CD yarn 13 with respect to the thickness direction is different before and after folding back the MD yarn 11. In such a case, as a result, a force in the machine transverse direction is inevitably applied to the MD yarn 11 having the central fold, so that the MD yarn 11 is likely to shift in the machine transverse direction, and the seam loop 21 on the extension of the MD yarn 11 is likely to tilt.

[0111] However, in the present invention, by adopting a specific filling yarn, the arrangement of the seam loops 21 is fixed, and the tilting of the seam loops 21 is prevented. That is, when using a woven fabric having a repetition including the above-described Patterns I-1 to I-3, the effects of the present invention are more significantly exhibited.

[0112] Next, in the woven fabric 10E shown in FIG. 8, after the CD yarn 13 passes between the a-th MD yarn 11 and the (a + 1)-th MD yarn 11 from the first surface 15 of the woven fabric 10E, or after passing through the second surface 17 side of the n-th MD yarn 11 from the first surface 15 (dashed line), it has a repetition including a pattern of passing through the first surface 15 side of the first MD yarn from the first surface 15 a plurality of times (Pattern II-1). In the woven fabric 10F shown in FIG. 8, after the CD yarn 13 passes through the first surface 15 side of the first MD yarn 11 from the first surface 15 a plurality of times, it passes between the a-th MD yarn 11 and the (a + 1)-th MD yarn 11 from the first surface 15 or passes through the second surface 17 side of the n-th MD yarn 11 from the first surface 15 (dashed line), and has a repetition including such a pattern (Pattern II-2).

[0113] Also in the woven fabrics 10E and 10F of Patterns II-1 and II-2 shown in FIG. 8, in the process of the CD yarn 13 turning back the MD yarn 11 above the center of the drawing in the figure, a force in the machine transverse direction is likely to be applied to the MD yarn 11, and as a result, the MD yarn 11 is likely to shift in the machine transverse direction, and the seam loop 21 on the extension of the MD yarn 11 is likely to tilt. However, in the present invention, by adopting a specific filling yarn, even when Patterns II-1 and II-2 shown in FIG. 8 are included in the woven fabric, the arrangement of the seam loops 21 is fixed, and the tilt of the seam loops 21 is prevented.

[0114] In the woven fabric 10G shown in FIG. 9, after the CD yarn 13 passes between the a-th MD yarn 11 and the (a + 1)-th MD yarn 11 from the first surface 15 of the woven fabric 10G, it passes through the first surface 15 side of the first MD yarn from the first surface 15, and then has a repetition including a pattern of passing between the a-th MD yarn 11 and the (a + 1)-th MD yarn 11 from the first surface 15 (Pattern III-1). Also, in the woven fabric 10H shown in FIG. 9, the CD yarn 13 has a repetition including a pattern in which after passing from the first surface 15 of the woven fabric 10H to the second surface 17 side of the n-th MD yarn 11, it passes from the first surface 15 to the first surface 15 side of the first MD yarn, and then passes from the first surface 15 to the second surface 17 side of the n-th MD yarn 11 (Pattern III-2).

[0115] In the woven fabrics 10G and 10H of Patterns III-1 and III-2 shown in FIG. 9, the CD yarn 13 folds back the MD yarn 11 above the paper surface in the center of the figure, respectively. However, the angle of the CD yarn 13 with respect to the thickness direction is the same before and after folding back the MD yarn 11. Therefore, in the process of the CD yarn 13 folding back the MD yarn 11 above the paper surface in the center of the figure, a force in the machine transverse direction is hardly applied to the MD yarn 11. As a result, the seam loop 21 on the extension of the MD yarn 11 is hardly inclined. However, even when the inclination of the seam loop 21 due to the fabric structure of such woven fabrics 10G and 10H hardly occurs, the inclination of the seam loop 21 may occur due to the action of external force during needling or storage. Even in such a case, in the present invention, by adopting a specific filling yarn, the arrangement of the seam loops 21 is fixed, and the inclination of the seam loops 21 is prevented.

[0116] Also, in the warp and weft double weave and the warp and weft multi-layer weave, there are portions where the upper layer tissue and the lower layer tissue are not fixed between the layers, and due to the structure of the fabric tissue, the upper layer and the lower layer between the layers are likely to shift. For this reason, the MD yarns of the upper layer and the lower layer are likely to shift from each other, and the seam loop on the extension of the MD yarn is likely to incline. However, in the present invention, by adopting a specific filling yarn, even when using a woven fabric of a warp and weft double weave, the arrangement of the seam loops is fixed, and the inclination of the seam loops is prevented.

[0117] Among the warp double weaves, when the upper MD yarns and the lower MD yarns do not exist at the same position in the thickness direction and the lower MD yarns are arranged between the upper MD yarns when the woven fabric is viewed in plan, this structure is called "1.5 warp double weave". Similarly, among the weft double weaves, when the upper CD yarns and the lower CD yarns do not exist at the same position in the thickness direction and the lower CD yarns are arranged between the upper CD yarns when the woven fabric is viewed in plan, this structure is called "1.5 weft double weave". Examples of the 1.5 warp double weave include 2 / 1 1 / 2 warp 1.5 double weave and the like.

[0118] Among the above, in the 1.5 warp double weave, due to the structure of the fabric texture, the positions of the upper MD yarns and the lower MD yarns in the machine transverse direction are different. As a result, the seam loops formed by the upper MD yarns and the lower MD yarns tend to have an inclination with respect to the thickness direction. However, in the present invention, by adopting a specific filling yarn, even when using a woven fabric of 1.5 warp double weave, the arrangement of the seam loops is fixed, and the inclination of the seam loops is prevented.

[0119] Note that the woven fabric of the base member for felt may contain MD yarns that do not contribute to the formation of seam loops.

[0120] (3.3. Third modification example) In the above-described embodiment, at the end of the base member 1 for the papermaking felt, it has been described that two filling yarns 31 and 32 form a texture woven into the MD yarns 11A and 11B as shown in FIG. 4. However, the present invention is not limited to this, and the filling yarn can be woven into the MD yarns in any fabric texture.

[0121] As the fabric texture formed by the filling yarn and the MD yarn, for example, a texture in which the CD yarn in the fabric texture having a repeat including the patterns III-1 or III-2 shown in FIG. 9 described above is replaced with the filling yarn is preferable. Such a fabric texture can sufficiently fix the CD yarn forming the seam loop and can more reliably fix the arrangement of the seam loops.

[0122] Examples of such a fabric texture include the 1 / 1 warp double weave shown in FIG. 4.

[0123] (3.4. Fourth Modification) In the above-described embodiment, the short fiber layer 60 of the papermaking felt 100 has been described as having the roll side layer 63. However, the present invention is not limited thereto, and the roll side layer 63 may be omitted.

[0124] As described above, the present invention has been described in detail based on the preferred embodiments. However, the present invention is not limited thereto, and each component can be replaced with any component that can exhibit the same function, or any component can be added.

Example

[0125] Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited by these examples.

[0126] <1. Manufacture of Papermaking Felt> (Example) First, the following base member for the papermaking felt according to the example was prepared. The woven fabric was configured as follows. Seam loops were formed at both ends of the woven fabric.

[0127] MD yarn: 1,000 dtex polyamide 6 monofilament single yarn, 90 pieces / 5 cm CD yarn: A twisted yarn of three 330 dtex polyamide 6 monofilament single yarns, 80 pieces / 5 cm Woven fabric structure of MD yarn and CD yarn: 2 / 1 1 / 2 warp double weave (warp 1.5 - ply weave) Areal density: 450 g / m 2

[0128] Next, the following filling yarns were prepared and woven into the MD yarn between the seam loop and the woven fabric so as to form a 1 / 1 warp double weave. When weaving into the MD yarn, the first filling yarn was arranged on the seam loop side and the second filling yarn was arranged on the CD yarn side.

[0129] Filling yarn: Two yarns, the first filling yarn and the second filling yarn First filling yarn: Two polyamide 6 span yarns (588 dtex) twisted at 0.5 turns / cm in Z twist were twisted together at 3.2 turns / cm in S twist to obtain the first filling yarn (1150 dtex). Second filling yarn: A ply yarn (1150 dtex) of two polyamide 6 span yarns (588 dtex) twisted at 0.5 turns / cm in Z twist and twisted together at 3.2 turns / cm in S twist was created. Then, one ply yarn of the span yarn and two polyamide 6 multifilament yarns (7 d × 30 filaments, 210 dtex) were twisted together at 3.0 turns / cm in S twist to obtain the second filling yarn (1695 dtex).

[0130] Next, short fibers were entangled and integrated with the above base member for the papermaking felt by needling to complete the precursor of the papermaking felt. As the short fiber layers formed on the papermaking felt, a wet paper side surface layer, a wet paper side inner layer, and a roll side layer were formed. The short fiber layers were laminated in the following number of layers with cards in which the composition and basis weight of the short fibers such as fineness were set as follows for each layer, and were entangled with the base member for the papermaking felt.

[0131] Wet paper side surface layer card: 15 dtex polyamide 66 short fibers, basis weight: 100 g / m 2 , 2 layers Wet paper side inner layer card: 22 dtex polyamide 66 short fibers, basis weight: 100 g / m 2 , 3 layers Roll side card: 22 dtex polyamide 66 short fibers, basis weight: 100 g / m 2 , 2 layers

[0132] The precursor of the above papermaking felt was subjected to chemical treatment, heat setting, and press working, the core wire was removed, and the short fibers in the seam loop part were cut to create a flap, thereby completing the papermaking felt according to the example. The basis weight of the papermaking felt was 1,100 g / m 2 , the thickness was 2.65 mm, and the air permeability was 27.5 cc / m 2 / sec.

[0133] (Comparative example) A base member for a papermaking felt and a papermaking felt according to a comparative example were obtained in the same manner as in the examples, except that the configuration of the filling yarn was changed as follows.

[0134] A twisted yarn (1150 dtex) of span yarns was prepared by twisting two polyamide 6 span yarns (588 dtex) twisted at 0.5 turns / cm in Z twist together at 3.2 turns / cm in S twist. Thereafter, one twisted yarn of the span yarn and two polyamide 6 multifilament yarns (7 d × 30 pieces, 210 dtex) were twisted together at 3.0 turns / cm in S twist to obtain a first filling yarn and a second filling yarn (1695 dtex). That is, the same yarn was used for the first filling yarn and the second filling yarn.

[0135] <2. Evaluation> The examples and the comparative example were evaluated by the following evaluation methods. (1) Degree of alignment of the seam loop arrangement The papermaking felt according to the example and the papermaking felt according to the comparative example were observed with an optical microscope without inserting a core wire into the seam loop portion, and the degree of alignment of the seam loop arrangement was evaluated. The results are shown in FIGS. 14 and 15. FIG. 14 is an enlarged photographic image of the seam loop portion of the papermaking felt according to the example, and FIG. 15 is an enlarged photographic image of the seam loop portion of the papermaking felt according to the comparative example.

[0136] As shown in FIGS. 14 and 15, the papermaking felt according to the example had a more orderly seam loop arrangement compared to the papermaking felt according to the comparative example. From this, it can be understood that the papermaking felt according to the example is superior in workability when joining the seam loops during seam formation compared to the papermaking felt according to the comparative example.

[0137] (2) Core wire insertion resistance evaluation For the papermaking felt according to the example and the papermaking felt according to the comparative example, a core wire (φ0.4 mm × 4 pieces) was inserted through the seam loop portion, and the force (core wire insertion resistance) with which the core wire could move was evaluated for each papermaking felt width of 70 cm. The core wire insertion resistance value according to the example was 0.81 kgf / 70 cm, while the core wire insertion resistance value according to the comparative example was 7.50 kgf / 70 cm. The papermaking felt according to the example has a more orderly seam loop arrangement and a significantly smaller core wire insertion resistance value compared to the papermaking felt according to the comparative example. From this, it can be understood that the papermaking felt according to the example is superior in workability when joining the seam loop during the formation of the seam portion compared to the papermaking felt according to the comparative example.

[0138] (3) Marking property evaluation The marking properties of the papermaking felt according to the example and the papermaking felt according to the comparative example were evaluated. First, as shown in Fig. 16(a), on the papermaking felt 1, carbon paper 301, paper 302, and a short fiber batt 303 (100 g / m 2 ) were arranged in this order. Here, the lamination was performed so that the carbon paper 301 and the paper 302 were arranged on the seam portion 50 of the papermaking felt 1.

[0139] Next, as shown in Fig. 16(b), for the papermaking felt 1 on which the carbon paper 301, the paper 302, and the batt 303 were arranged, pressing was performed using two press rolls 400 with a diameter of 100 mm under the conditions of a pressing speed of 5 cm / sec and a linear pressure of 50 kgf / cm to transfer the shape of the seam portion of the papermaking felt 1 onto the paper and form a seam mark.

[0140] In the formation of this seam mark, pressing is performed at a slower pressing speed compared to a general papermaking machine press so that the seam mark is clearly formed.

[0141] The results are shown in Figs. 17 and 18. Fig. 17 is an enlarged photographic image of a seam mark transferred to paper pressed using the papermaking felt according to the example, and Fig. 18 is an enlarged photographic image of a seam mark transferred to paper pressed using the papermaking felt according to the comparative example. As shown in Figs. 17 and 18, the seam mark transferred to the papermaking felt according to the example was smaller than that transferred to the papermaking felt according to the comparative example. Therefore, it can be understood that the formation of the seam mark is suppressed in the papermaking felt according to the example as compared with the papermaking felt according to the comparative example.

Explanation of Signs

[0142] 1, 1A Base member for papermaking felt 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H Woven fabric 11, 11A, 11B Machine direction yarn (MD yarn) 13 Cross machine direction yarn (CD yarn) 20 Seam loop part 21 Seam loop 30, 30A, 31, 31A, 32, 32A, 33A Filling yarn 40 Core wire 50 Seam part 60 Short fiber layer 61 Wet paper side surface layer 62 Wet paper side inner layer 63 Roll side layer 100 Papermaking felt

Claims

1. a woven fabric having ends, the woven fabric including machine direction yarns traversing the machine direction and cross machine direction yarns oriented along a cross machine direction and interwoven with the machine direction yarns; a plurality of core wire insertion loops formed by folding back the machine direction yarns at both ends of the woven fabric in the machine direction, through which a core wire can be inserted; At least one end of the woven fabric includes a plurality of filling yarns arranged along the cross-machine direction between the cross-machine direction yarns arranged at the endmost portion of the woven fabric and the core wire insertion loop, A base member for papermaking felt, wherein the fineness of a first filling yarn among the plurality of filling yarns that is arranged closest to the core wire insertion loop is smaller than the fineness of a second filling yarn that is arranged on the cross-machine direction yarn side of the first filling yarn.

2. 2. A base member for a papermaking felt according to claim 1, wherein the second fill yarns are adjacent to the first fill yarns.

3. 2. The base member for a papermaking felt according to claim 1, wherein the fineness of the first filling yarn is 240 dtex or more and 2,000 dtex or less.

4. 2. The base member for a papermaking felt according to claim 1, wherein the fineness of the second filling yarn is 330 dtex or more and 2,090 dtex or less.

5. 2. The base member for a papermaking felt according to claim 1, wherein the fineness of the first filler yarn is smaller than the fineness of the second filler yarn by 90 dtex or more and 1,850 dtex or less.

6. 2. The base member for a papermaking felt according to claim 1, wherein a ratio of a fineness of the second filler yarn to a fineness of the first filler yarn is 105% or more and 195% or less.

7. 2. The base member for a papermaking felt according to claim 1, wherein the plurality of filler yarns at the at least one end of the woven fabric comprises the first filler yarns and the second filler yarns.

8. 2. The base member for a papermaking felt according to claim 1, wherein the second fill yarn comprises a spun yarn and / or a multifilament yarn.

9. 2. The base member for a papermaking felt according to claim 1, wherein the first fill yarn comprises a spun yarn and / or a multifilament yarn.

10. 2. A base member for a papermaking felt according to claim 1, wherein said plurality of fill yarns are interwoven with said machine direction yarns to form a warp double weave.

11. the machine direction yarns include upper and lower yarns that define the core wire insertion loop; The base member for a papermaking felt according to claim 10, wherein the warp double structure includes a repeating unit in which each of the multiple filling yarns passes on the side opposite the lower yarn side of one of the upper yarns of the machine direction yarns and passes on the side opposite the upper yarn of an adjacent lower yarn, and adjacent filling yarns do not pass on the side opposite the lower yarn side of the same upper yarn.

12. 2. The base member for a papermaking felt according to claim 1, wherein the woven fabric has a warp-and-warp double structure or a warp-and-warp multiple structure.

13. The woven fabric has an n-fold warp weave, or a repeat pattern in which the cross-machine direction yarns pass between the ath machine direction yarn and the a+1th machine direction yarn from a first surface, which is one surface of the woven fabric, then pass over the first surface side of the first machine direction yarn from the first surface, and then pass between the bth machine direction yarn and the b+1th machine direction yarn from the first surface; or or a repeat pattern in which the cross machine direction yarn passes between the ath machine direction yarn and the a+1th machine direction yarn from the first surface, then passes over the first surface side of the first machine direction yarn from the first surface, and then passes over the second surface side of the nth machine direction yarn from the first surface, which is the other surface of the woven fabric; or the cross machine direction yarns include a repeat including a pattern of passing over the second surface side of an nth machine direction yarn from the first surface, passing over the first surface side of a first machine direction yarn from the first surface, and then passing between a bth machine direction yarn and a b+1th machine direction yarn from the first surface; 2. The base member for a papermaking felt according to claim 1, wherein n is an integer of 2 or more, a and b are integers of 1 or more and n-1 or less, and a≠b.

14. A base member for papermaking felt according to any one of claims 1 to 13, and a short fiber layer laminated on the base member for papermaking felt.

Images