Base member for papermaking felt and papermaking felt

Abstract

Provided are a base member for a papermaking felt and a papermaking felt, the base member having a seam, the base member being capable of suppressing the occurrence of seam traces in a seam part without impairing the operability of a joining seam ring, and having a seam. The base member for a papermaking felt includes: an end-shaped woven fabric including machine direction yarns that move back and forth in a machine direction, and machine transverse direction yarns that are disposed along a machine transverse direction and into which the machine direction yarns are woven; a plurality of core wire insertion rings which are formed by folding back the machine direction yarns at both ends of the weaving machine direction, and through which the core wires can be inserted; and a plurality of filler yarns disposed in the machine cross-sectional direction between the machine cross-sectional direction yarn disposed at the outermost end of the woven fabric and the core yarn insertion ring at at least one end of the woven fabric, among the plurality of filling yarns, the fineness of a first filling yarn disposed closest to the core yarn insertion ring is smaller than the fineness of a second filling yarn disposed closer to the machine cross-sectional direction yarn side than the first filling yarn.

Description

Technical Field

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

[0002] In the press section of the papermaking process, the water is squeezed out of the wet paper mainly by a papermaking felt and a pair of press rolls. Since the press section is usually a continuous device, the papermaking felt also needs to move continuously, so the papermaking felt is used as an endless felt formed in the press section.

[0003] As papermaking felts, endless papermaking felts and end-shaped papermaking felts are generally used. Since endless papermaking felts are formed in an endless shape, there is no joint of the felt, and the shape derived from the joint is not transferred to the wet paper. On the other hand, when endless papermaking felts are put into a papermaking machine, they are put in by removing the rollers or roller supporting parts using a crane, so in a large papermaking machine, the machine needs to be stopped for a long time for the putting-in operation.

[0004] In contrast, the end-shaped papermaking felt is generally a seamed papermaking felt having seam rings at both ends for joining, and is easy to put into the papermaking machine. After stopping the papermaking machine, the seamed papermaking felt is connected to the rope or sling that passes through the used papermaking felt or papermaking machine via the seamed felt guide belt pre-installed on the newly inserted seamed papermaking felt and is pulled into the papermaking machine without removing the roller or the roller support member.

[0005] Thereafter, both ends of the inserted papermaking felt are butted against each other, and the core wire is inserted into the space where the seam rings can be alternately engaged, so that the papermaking felt is made endless, and the insertion operation into the machine is completed.

[0006] In such a papermaking felt with a seam, the shape of the seam ring has a great influence on the workability of the operation of inserting the core wire into the space formed by the alternate engagement of the seam ring, that is, the joining operation of the seam ring. In addition, the joint portion (seam portion) of the seam ring contacts the wet paper during water squeezing, causing unevenness called a so-called seam mark on the wet paper. The shape of the seam ring also greatly affects the shape of the seam mark. Furthermore, the short fibers stacked on the felt near the seam ring also tend to fall off easily.

[0007] In order to rationalize the shape of the seam loop to improve the workability of the joining operation, to reduce the seam mark of the seam portion, and to prevent the short fibers of the seam portion from falling off, various technologies have been proposed that focus on the seam loop and its vicinity.

[0008] Patent document 1 discloses the following scheme for a felt with a seam: the portion where the weft yarn is woven near the seam ring does not become a convex portion or a concave portion that causes uneven pressure when pressurized, thereby avoiding undesirable conditions such as seam marks. Furthermore, in order to suppress the distortion of the ring and prevent the folded wings from falling off, a twisted yarn formed by twisting two yarn materials together is arranged in the weft yarn near the seam ring.

[0009] Patent document 2 proposes a scheme for a felt with a seam: with the purpose of preventing the difficulty of the seam ring joining operation by forming a structure in which the basic position of the ring relative to the entire base component is not fixed, at the end edge of the CD yarn material, an adjustment yarn woven into the base component with a textile pattern different from that of the CD yarn material is independently arranged in each layer of the MD yarn material.

[0010] Patent document 3 proposes a solution for a felt with seams: the fineness, density and weaving structure of the CD yarn material in the seam loop area are changed for the purpose of improving the non-uniformity of the permeability, compressibility, etc. of the felt with seams in the seam loop area.

[0011] Prior art literature

[0012] Patent Literature

[0013] Patent Document 1: Japanese Patent Application Publication No. 2008-297637

[0014] Patent Document 2: Japanese Patent Application Publication No. 2003-247191

[0015] Patent Document 3: Japanese Patent Application Publication No. 2003-166189 Summary of the invention

[0016] The typical production process of a seamed papermaking felt includes the following steps.

[0017] Step 1: A step of preparing an endless base member by alternately engaging the seam rings at both ends of a base member having an end provided with seam rings at both ends in the machine direction and inserting a core wire into a cylindrical space formed by the seam rings.

[0018] Step 2: A step of tensioning and heat-setting the endless base member.

[0019] Step 3: A step of replacing the core wire of the endless base member before needling.

[0020] Step 4: A step of laminating a film-like product obtained by forming short fibers using a card or the like on the endless base member, and entangled and integrated the film by needle punching to prepare a precursor of a papermaking felt with a seam.

[0021] Step 5: A step of replacing the core yarn of the precursor of the seamed papermaking felt.

[0022] Step 6: A step of chemically treating the precursor of the seamed papermaking felt, stretching and heat-setting the precursor, and preparing a seamed papermaking felt.

[0023] Step 7: A step of removing the core of the seamed papermaking felt, cutting short fibers on both the wet paper side and the roll side of the seam loop, and forming flaps on the wet paper side of the short fiber layer.

[0024] Step 8: A step of winding the seamed papermaking felt into a roll, packaging it, and storing it.

[0025] Here, as shown in the above step 2 or the above step 6, the papermaking felt with seams is stretched and heat-set using an end-shaped base member and the papermaking felt with seams is processed to maintain the dimensional stability of the base member itself or the shape of the seam loops. However, the completed papermaking felt with seams is usually stored in a papermaking company until it is used in a state where the seam loops at both ends are not alternately engaged but are wound in a roll shape, that is, in an end-shaped state. Moreover, when stored in a papermaking company, the arrangement of the seam loops is gradually broken down by the force inherent in the warp yarns constituting the seam loops or the weft yarns near the seam loops as time passes.

[0026] Furthermore, when the arrangement of the seam rings is broken, it is difficult to insert and pass the core wire, and thus the workability of joining the seam rings is impaired. In addition, due to the breakdown of the arrangement of the seam rings or the increase in the unevenness of the seam portion, seam marks are easily generated in the wet paper in contact with the papermaking felt during pressing. The papermaking felt with seams described in the prior art documents still has room for further improvement in view of the above problems.

[0027] Therefore, an object of the present invention is to provide a base member for a papermaking felt and a papermaking felt having a seam, which does not impair the workability of joining a seam ring and suppresses the occurrence of seam marks at the seam portion.

[0028] Technical means for solving technical problems

[0029] The inventors of the present invention conducted intensive research to achieve the above-mentioned object and eventually found that the filling yarn arranged along the cross-machine direction yarn material arranged at the end edge of the base member for papermaking felt with a seam has a relatively large influence on the shape-retaining property of the seam loop. Furthermore, the inventors focused on the fineness, type, and weaving method of the filling yarn, and especially studied the influence of the filling yarn during needling, and eventually arrived at the present invention.

[0030] The gist of the present invention is as follows.

[0031] [1] A base member for a papermaking felt, comprising:

[0032] An end-shaped woven fabric comprising machine direction yarns running back and forth in the machine direction and cross-machine direction yarns arranged in the cross-machine direction and woven into the machine direction yarns,

[0033] a plurality of core thread insertion loops formed by folding back the machine direction yarn at both ends of the woven fabric in the machine direction, through which the core thread can be inserted, and

[0034] a plurality of filling yarns arranged along the cross-machine direction at at least one end of the woven fabric, between the cross-machine direction yarn arranged at the endmost end of the woven fabric and the core thread insertion ring;

[0035] Among the plurality of filling yarns, a first filling yarn disposed closest to the core yarn insertion loop has a fineness smaller than a second filling yarn disposed on the cross-machine direction yarn side relative to the first filling yarn.

[0036] [2] The papermaking felt base member according to [1],

[0037] The second fill yarn is adjacent to the first fill yarn.

[0038] [3] The papermaking felt base member according to [1] or [2],

[0039] The first filling yarn has a fineness of 240 dtex or more and 2000 dtex or less.

[0040] [4] The papermaking felt base member according to any one of [1] to [3],

[0041] The second filling yarn has a fineness of 330 dtex or more and 2090 dtex or less.

[0042] [5] The papermaking felt base member according to any one of [1] to [4],

[0043] The fineness of the first filling yarn is smaller than the fineness of the second filling yarn by 90 dtex or more and 1850 dtex or less.

[0044] [6] The papermaking felt base member according to any one of [1] to [5],

[0045] A 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.

[0046] [7] The papermaking felt base member according to any one of [1] to [6],

[0047] At the at least one end portion of the woven fabric, the plurality of filling yarns are composed of the first filling yarn and the second filling yarn.

[0048] [8] The papermaking felt base member according to any one of [1] to [7],

[0049] The second filling yarn includes spun yarn and / or multifilament yarn.

[0050] [9] The papermaking felt base member according to any one of [1] to [8],

[0051] The first filling yarn includes spun yarn and / or multifilament yarn.

[0052]

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

[0053]

[11] The papermaking felt base member according to

[10] ,

[0054] The machine direction yarn includes an upper yarn and a lower yarn constituting the core thread insertion loop,

[0055] The double warp structure is as follows: it contains a repeating unit, wherein the multiple filling yarns respectively pass through the side of one of the upper yarns of the machine direction yarn opposite to the lower yarn side and pass through the side of an adjacent lower yarn opposite to the upper yarn, and the adjacent filling yarns do not pass through the side of the same upper yarn opposite to the lower yarn side.

[0056]

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

[11] ,

[0057] The woven fabric has a warp and weft double structure or a warp and weft multiple structure.

[0058]

[13] The papermaking felt base member according to any one of [1] to

[11] ,

[0059] The woven fabric has a warp n-fold structure.

[0060] The invention comprises a repetition of a pattern, wherein the machine cross direction yarn passes from the first side, which is one side of the woven fabric, between the a-th machine direction yarn and the a+1-th machine direction yarn, passes from the first side to the first side side of the first machine direction yarn, and then passes from the first side to between the b-th machine direction yarn and the b+1-th machine direction yarn, or

[0061] The invention comprises a repetition of a pattern, wherein the machine cross direction yarn passes from the first side between the a-th machine direction yarn and the a+1-th machine direction yarn, passes from the first side through the first side of the first machine direction yarn, and then passes from the first side through the second side of the other side of the woven fabric of the n-th machine direction yarn, or

[0062] comprising a repeat of a pattern, the pattern being a pattern in which the cross-machine direction yarn passes from the first side through the second side side of the nth machine direction yarn, passes from the first side through the first side side of the first machine direction yarn, and then passes from the first side between the bth machine direction yarn and the b+1th machine direction yarn,

[0063] Here, n is an integer greater than or equal to 2, a and b are any integers greater than or equal to 1 and less than or equal to n-1, and a≠b.

[0064]

[14] A papermaking felt comprising:

[0065] The base member for papermaking felt according to any one of [1] to

[13] ; and a short fiber layer laminated on the base member for papermaking felt.

[0066] Effects of the Invention

[0067] According to the above configuration, it is possible to provide a papermaking felt base member and a papermaking felt having a seam, which can suppress the occurrence of seam marks at the seam portion without impairing the workability of joining the seam ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a schematic diagram of a base member for papermaking felt according to the present embodiment.

[0069] Figure 2 It is shown Figure 1 A machine direction cross-sectional view of a seam loop portion of a base member for a papermaking felt shown.

[0070] Figure 3 It is shown Figure 1 The machine direction cross-sectional view of the papermaking felt base member is shown in a state where the seam loop portions are joined to each other.

[0071] Figure 4 Is used to illustrate the Figure 1 The illustrated diagram is a cross-machine direction sectional view of a woven structure formed by filling yarns and machine direction yarns of a base member for a papermaking felt.

[0072] Figure 5 This is a machine direction cross-sectional view of the vicinity of a seam portion of the papermaking felt according to the present embodiment.

[0073] Figure 6 This is a machine direction cross-sectional view showing a part of a base member for papermaking felt according to a modified example of the present invention.

[0074] Figure 7 This is a cross-sectional view in the machine direction for explaining the weave structure of a woven fabric of a base member for a papermaking felt according to a modified example of the present invention.

[0075] Figure 8 This is a cross-sectional view in the machine direction for explaining the weave structure of a woven fabric of a base member for a papermaking felt according to a modified example of the present invention.

[0076] Fig. 9 This is a cross-sectional view in the machine direction for explaining the weave structure of a woven fabric of a base member for a papermaking felt according to a modified example of the present invention.

[0077] Fig.10 This is a schematic diagram for explaining the relationship between the arrangement of the seam rings and the insertion of the core wire.

[0078] Fig.11 This is a schematic diagram for explaining the relationship between the arrangement of the seam rings and the insertion of the core wire.

[0079] Fig.12 This is a schematic diagram for explaining the relationship between the arrangement of the seam rings and the insertion of the core wire.

[0080] Fig.13 This is a schematic diagram for explaining the relationship between the arrangement of the seam rings and the insertion of the core wire.

[0081] Fig.14 This is an enlarged photographic image of the seam loop portion of the papermaking felt of the example.

[0082] Fig.15 This is an enlarged photographic image of a seam loop portion of a papermaking felt of a comparative example.

[0083] Fig.16 This is a schematic diagram for explaining a trace evaluation test of a papermaking felt.

[0084] Fig.17 This is an enlarged photographic image of a seam mark transferred to a paper pressed using the papermaking felt of the example.

[0085] Fig.18 This is an enlarged photographic image of a seam mark transferred to a paper pressed using the papermaking felt of the comparative example. DETAILED DESCRIPTION

[0086] Hereinafter, preferred embodiments of the base member for a papermaking felt and the papermaking felt of the present invention will be described in detail with reference to the drawings.

[0087] <1. Base member for papermaking felt>

[0088] First, the base member for papermaking felt according to the present embodiment will be described. Figure 1 1 is a schematic diagram of a base member for papermaking felt according to the present embodiment. Figure 2 It is shown Figure 1 A machine direction cross-sectional view of a seam loop portion of a base member for a papermaking felt shown in FIG. Figure 3 It shows that the connection Figure 1 A machine direction cross-sectional view showing the state of the seam loop portions of the base member for papermaking felt shown, Figure 4 Is used to illustrate the Figure 1 The illustrated diagram is a cross-machine direction sectional view of a woven structure formed by filling yarns and machine direction yarns of a base member for a papermaking felt.

[0089] It should be noted that in the drawings, the size of each component is appropriately emphasized for ease of explanation, and the actual ratio and size of each component are not shown. In addition, in the drawings, the description of some components is appropriately omitted for ease of explanation. Here, the cross machine direction (Cross machine Direction) is also referred to as "CD", and the machine direction (Machine Direction) is also referred to as "MD".

[0090] Figure 1 The papermaking felt base member 1 of the present embodiment shown is a base member of a papermaking felt 100 with a seam described later, and can be used as Figure 5 As shown, a short fiber layer 60 is placed on a papermaking felt base member 1 to form a papermaking felt 100 with a seam. Figure 1 The illustrated papermaking felt base member 1 includes a woven fabric 10 , a seam loop portion 20 , and a filling yarn 30 .

[0091] The fabric 10 is a strip-shaped member having ends, such as Figure 2 As shown, the woven fabric 10 includes machine direction yarns (MD yarns) 11A and 11B that move back and forth in the machine direction (MD), and machine cross direction yarns (CD yarns) 13 that are arranged along the cross direction (CD) and woven into the MD yarns 11A and 11B. The fabric structure of the woven fabric 10 or the structure of the MD yarns 11A, 11B and the CD yarns 13 will be described later.

[0092] The seam loop portion 20 is provided at both ends of the woven fabric 10 in the machine direction, and includes a plurality of core thread 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 is extended from the woven fabric 10 and folded 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 toward the cross-machine direction, and returns to the woven fabric 10 as the MD yarn 11B to form the seam loop 21. Furthermore, the seam loops 21 are formed by each of the MD yarns 11A and 11B, so that the seam loop portion 20 as a row of a plurality of seam loops 21 along the cross-machine direction is formed at both ends of the woven fabric 10 in the machine direction.

[0093] In addition, the average minimum diameter of each seam ring 21 is not particularly limited, and is, for example, 0.50 mm to 4.00 mm.

[0094] Each seam loop 21 is basically formed in the thickness direction of the fabric 10, so that the core thread 40 can be inserted in the cross-machine direction in each of the formed seam loops 21. Therefore, in the seam loop portion 20, the core thread 40 can be inserted through a plurality of seam loops 21 in the cross-machine direction.

[0095] Moreover, if Figure 3 As shown, by engaging the seam rings 21 of the seam ring portion 20 at both ends of the base component 1 for papermaking felt in the machine direction, the core wire 40 is inserted into the seam ring 21 to form a seam portion 50, and the two ends of the base component 1 for papermaking felt in the machine direction are joined, resulting in the base component 1 for papermaking felt becoming annular.

[0096] Here, generally speaking, ideally, Fig.10 As shown, the seam rings 221 are arranged in a row along the cross-machine direction, and the seam rings 221 themselves are parallel to the thickness direction TD. In this case, the core wire 240 can be easily inserted into each seam ring 221.

[0097] The base member for papermaking felt and the papermaking felt are stretched and heat-set during the manufacturing process, so that the dimensional stability of the base member itself and the shape of the seam loop are maintained. However, the finished papermaking felt is stored in a papermaking company until it is used, in a state where the seam loops at both ends are not alternately engaged but wound in a roll shape, that is, in an end-shaped state. In addition, when stored in the papermaking company, the force inherent in the MD yarns constituting the seam loops or the CD yarns near the seam loops gradually collapses the arrangement of the seam loops over time.

[0098] For example, Fig.11 , Fig.12 As shown in FIG. 1 , each seam ring 221A, 221B may be inclined relative to the thickness direction TD. Fig.13 As shown in FIG. 1 , there is a case where the seam rings 221C are not along the machine cross-sectional direction but are offset in the thickness direction. In many cases, these situations occur simultaneously. Moreover, when the seam rings 221A and 221B are tilted or the position of the seam ring 221C is offset, it is difficult to insert the core wire 240 through the space formed by the seam rings 221A, 221B, and 221C because it is difficult to alternately engage the seam rings 221A, 221B, and 221C at the two end portions and the insertion resistance of the core wire 240 increases.

[0099] In this way, when the arrangement of the seam rings is broken, it is difficult to insert and pass the core wire, thereby impairing the operability of joining the seam rings. In addition, due to the collapse of the arrangement of the seam rings, the unevenness of the seam portion becomes larger, and as a result, the wet paper that contacts the papermaking felt during pressing in use is prone to seam marks.

[0100] However, in the papermaking felt base member 1 of the present embodiment, the arrangement of the seam loops 21 in the seam loop portion 20 is suppressed from being disrupted by the filling yarn 30 described below.

[0101] like Figure 1 As shown, at both ends of the woven fabric 10 in the machine direction, between the CD yarns 13 disposed at the end portions of the woven fabric 10 and the seam loops 21, the filling yarns 30 are disposed along the cross-machine direction. Figure 1 , 2 As shown, in this embodiment, the filling yarn 30 includes a filling yarn (first filling yarn) 31 arranged on the seam loop 21 side and a filling yarn (second filling yarn) 32 arranged on the CD yarn side, and is composed of two filling yarns. The filling yarns 31 and 32 are woven into the MD yarns 11A and 11B constituting the seam loop 21, respectively.

[0102] By arranging the filling yarn 30 near the seam loop portion 20, the positions of the MD yarns 11A and 11B, especially the positions in the thickness direction, can be fixed, and the positions of the seam loops 21 can be fixed. Thus, the arrangement of the seam loops 21 is prevented from being disrupted.

[0103] In the papermaking felt 100 described later, the seam loop portions 20 are joined to form the seam portion 50, and the papermaking felt 100 is made into an endless shape. Since there is no CD yarn near the seam portion 50, the short fibers in the short fiber layer 60 are difficult to be fixed, and the short fibers tend to fall off easily when the papermaking felt 100 is used. However, the filling yarn 30 arranged near the seam portion 50 appropriately fixes the short fibers, and can prevent the short fibers from falling off from the short fiber layer 60.

[0104] Furthermore, the papermaking felt 100 is pressed together with the wet paper by the reciprocating pressing roller or the pressing shoe in the press section. The filling yarn 30 can fix the position of each seam ring 21, and can make the unevenness that is inevitably generated in the seam portion 50 relatively small. As a result, it is possible to suppress the generation of a pressing mark corresponding to the seam portion 50, i.e., a so-called seam mark, in the wet paper that contacts the papermaking felt during the press.

[0105] Furthermore, in the present 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. Thus, the filling yarn 30 can fully exert the various functions of the filling yarn 30. As a result, the base member 1 for papermaking felt does not impair the operability of joining the seam loop portion 20, and the occurrence of seam marks in the seam portion 50 is suppressed.

[0106] In detail, the filling yarn 31 arranged on the side of the seam ring 21 has only the filling yarn 32 arranged on the side of the CD yarn 13, which has a small degree of fixation and a high degree of freedom. On the other hand, the filling yarn 32 arranged on the side of the CD yarn 13 is sandwiched between the filling yarn 31 and the CD yarn 13, which has a large degree of fixation and a low degree of freedom.

[0107] When the papermaking felt 100 is manufactured, a film of short fibers is stacked on the papermaking felt base member 1 by cardstock or the like, and the short fibers are entangled and integrated by needle punching to form the short fiber layer (felt layer) 60 .

[0108] Here, the inventors of the present invention have found that, when the fineness of the filling yarn 31 and the fineness of the filling yarn 32 are of the same degree, the filling yarn 31 arranged on the side of the seam ring 21 has a greater stapling effect of the seam portion 50 during needling than the filling yarn 32 arranged on the side of the CD yarn 13. This is believed to be because the filling yarn 31 arranged on the side of the seam ring 21 is not fixed by other yarns, such as the CD yarn 13, compared to the filling yarn 32 arranged on the side of the CD yarn 13. As a result, during needling, the amount of shrinkage of the filling yarn 31 arranged on the side of the seam ring 21 is greater than the amount of shrinkage of the filling yarn 32 arranged on the side of the CD yarn 13 due to needling.

[0109] In this case, the forces received by the MD yarns 11A and 11B knitted into the filling yarn 31 and the MD yarns 11A and 11B knitted into the filling yarn 32 are unbalanced and become different from each other, and the arrangement of the seam loops 21 is disturbed. As a result, the effect of the filling yarn 30 cannot be fully exerted.

[0110] In contrast, as described above, in the present embodiment, the fineness of the filling yarn 31 disposed on the side of the seam ring 21 is smaller than the fineness of the filling yarn 32 disposed on the side of the CD yarn 13. As a result, the stitching effect during needling can be made equal at the filling yarns 31 and 32, and the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31 and 32 can be appropriately adjusted. As a result, the filling yarn 30 can fully exert the various functions of the filling yarn 30 described above.

[0111] The fineness of the filling yarn (first filling yarn) 31 disposed on the side of the seam ring 21 is not particularly limited, and is, for example, 240 dtex to 2000 dtex, preferably 900 dtex to 1400 dtex, and more preferably 1000 dtex to 1300 dtex. Thus, the stitching effect based on the needling can be appropriately obtained to the necessary degree.

[0112] The fineness of the filling yarn (second filling yarn) 32 disposed on the CD yarn 13 side is not particularly limited, and is, for example, 330 dtex to 2090 dtex, preferably 1400 dtex to 1900 dtex, and more preferably 1500 dtex to 1800 dtex. Thus, the stitching effect by needling can be fully obtained.

[0113] In addition, the fineness of the filling yarn (first filling yarn) 31 can be smaller than the fineness of the filling yarn (second filling yarn) 32, for example, 90 dtex or more and 1850 dtex or less, preferably 250 dtex or more and 1000 dtex or less, and more preferably 400 dtex or more and 700 dtex or less. Thus, the stitching effect and the shrinkage amount based on the needling can be set to the same level at 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.

[0114] In addition, 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% to 195%, preferably 120% to 180%, and more preferably 130% to 170%. Thus, the stitching effect and the amount of shrinkage due to needle punching can be made the same at 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 more appropriately adjusted.

[0115] In addition, in this embodiment, the filling yarn 30 is composed of two filling yarns, namely, 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 further suppressed. In addition, the arrangement of the seam rings 21 can be made more appropriate.

[0116] Furthermore, each yarn constituting the filling yarn 30 (the filling yarn 31 and the filling yarn 32 in the present embodiment) is woven into the MD yarns 11A and 11B. Figure 4 It is used to illustrate Figure 1 The machine cross-sectional view of the fabric structure formed by the filling yarns 31, 32 and the MD yarns 11A, 11B of the papermaking felt base member 1 is shown. Figure 4 As shown, in this embodiment, the filling yarn 31 and the filling yarn 32 are used as weft yarns, the MD yarn 11A is used as the upper warp yarn, and the MD yarn 11B is used as the lower warp yarn to form a double warp structure. By forming a double warp structure with the filling yarn 30 and the MD yarns 11A and 11B, the MD yarns 11A and 11B can be fixed by the filling yarn 30, and the arrangement of the fixed seam loops 21 becomes easy.

[0117] In addition, the filling yarn 31 and the filling yarn 32 each have a repeating unit that passes through the upper side of one MD yarn 11A in the figure (the opposite side of the MD yarn 11B) and passes through the lower side of the adjacent MD yarn 11B in the figure (the opposite side of the MD yarn 11A). Moreover, the adjacent filling yarns 31 and 32 do not pass through the upper side of the same MD yarn 11A in the figure (the opposite side of the MD yarn 11B). That is, the filling yarns 31 and 32 adjacent to the filling yarn 30 are phase-shifted 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 recorded as a 1 / 11 / 1 warp double structure according to the definition described later. As a result, 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.

[0118] Each yarn (filling yarn 31 and filling yarn 32) constituting the filling yarn 30 may be a yarn of any form, and may be a spun yarn (spun yarn), a filament yarn, a composite twisted yarn of two or more spun yarns (spun yarns), or a composite twisted yarn of one or more spun yarns (spun yarns) and one or more filament yarns. The forms of each yarn constituting the filling yarn 30 may be the same or different.

[0119] The spun yarn (spun yarn) is a yarn obtained by spinning using short fibers. The spun yarn is easily entangled with the short fibers or other yarns constituting the short fiber layer 60, such as the MD yarns 11A and 11B, by needle punching during the process of forming the short fiber layer 60, and is easy to help prevent the short fibers from falling off from the short fiber layer 60 and fix the arrangement of the seam loops 21.

[0120] The staple fibers constituting the spun yarn can have an average fiber length of, for example, 20 mm to 300 mm, preferably 50 mm to 200 mm. In addition, the average fineness of the staple fibers constituting the spun yarn is not particularly limited, and can be, for example, 1.0 dtex to 20 dtex, preferably 2.0 dtex to 15 dtex.

[0121] The fineness of the spun yarn is not particularly limited when the spun yarn itself is used as each yarn (the filling yarn 31 and the filling yarn 32) constituting the filling yarn 30, and is, for example, 240 dtex to 2090 dtex, preferably 1000 dtex to 2000 dtex.

[0122] When a spun yarn is used as a material of the composite twisted yarn, the fineness of the spun yarn is not particularly limited, and is, for example, 200 dtex to 1850 dtex, preferably 800 dtex to 1850 dtex.

[0123] Moreover, as a silk yarn, twisted yarn of a multifilament or a monofilament, a doubled yarn of a multifilament and / or a monofilament, and a single yarn of a monofilament are mentioned, for example.

[0124] Here, the so-called "multifilament" in this specification is a yarn composed of two or more monofilaments. Generally, the monofilaments constituting the multifilament have a fineness that cannot be used alone as the yarn of the base member 1 for papermaking felt. Specifically, the fineness of the monofilaments constituting the multifilament is, for example, less than 100 dtex. Preferably, it is 5 dtex or more and 50 dtex or less.

[0125] Here, the monofilament is a thread consisting of one strand. Usually, the monofilament constituting the monofilament has a fineness that can be used alone as a yarn for the papermaking felt base member 1. The fineness of the monofilament is, for example, 100 dtex to 2250 dtex, preferably 200 dtex to 2250 dtex.

[0126] In addition, "twisted yarn of multifilament or monofilament" refers to a twisted yarn using multifilament or monofilament as a raw yarn. In addition, "ply-ply-and-duplicate yarn of multifilament or monofilament" refers to a yarn formed by plying and doubling a plurality of single yarns constituting the above-mentioned multifilament or monofilament as a raw yarn.

[0127] When used as a plied and paralleled yarn of a multifilament or a monofilament, the plied and paralleled yarn can be obtained by plied and paralleling the original yarn so that the obtained multifilament yarn has a target fineness, for example. In this case, the fineness of the monofilament constituting the original yarn of the multifilament is preferably 5 dtex or more and less than 100 dtex, and more preferably 5 dtex or more and 50 dtex or less. In addition, the fineness of the original yarn of the monofilament is preferably 100 dtex or more and 1000 dtex or less, and more preferably 100 dtex or more and 500 dtex or less.

[0128] Furthermore, in the case of using a twisted yarn of a multifilament or a monofilament, a twisted yarn of a double twist or a single twist can be used. In the case of a double twist, for example, a plurality of raw yarns are plied and paralleled in a manner such that the yarn is 240 dtex or more and 2090 dtex or less, preferably 400 dtex or more and 1000 dtex or less, and the plied and paralleled raw yarn is twisted. Furthermore, in order to make the twisted plied and paralleled raw yarn have the target fineness, a plurality of yarns, for example 2 to 10 yarns, can be plied and paralleled, and further twisted to obtain a double twisted twisted yarn of a multifilament or a monofilament. In this case, the twist of the initial twist is not particularly limited, for example, it is 0.05 times / cm or more and 10.0 times / cm or less, preferably 0.1 times / cm or more and 5.0 times / cm or less. In addition, the twist of the double twist is not particularly limited, for example, it is 0.05 times / cm or more and 10.0 times / cm or less, preferably 0.1 times / cm or more and 5.0 times / cm or less. In addition, the twist of the double twist is not particularly limited, for example, it is 0.05 times / cm or more and 10.0 times / cm or less, preferably 0.1 times / cm or more and 5.0 times / cm or less.

[0129] In the case of single twist, a plurality of raw yarns may be plied and paralleled to obtain a target fineness, and the plied and paralleled raw yarns may be twisted to obtain a single twisted twisted yarn of a multifilament or a monofilament. In this case, the twist is not particularly limited, and is, for example, 0.05 times / cm to 20.0 times / cm, preferably 0.1 times / cm to 10.0 times / cm.

[0130] When twisted yarn is used, the fineness of the single yarn constituting the original yarn of the multifilament is preferably 5 dtex or more and less than 100 dtex, more preferably 5 dtex or more and 50 dtex or less. In addition, the fineness of the original yarn of the monofilament is preferably 150 dtex or more and 1500 dtex or less, more preferably 200 dtex or more and 1000 dtex or less.

[0131] In addition, appropriate processing may be performed on each yarn (the first filling yarn 31 and the second filling yarn 32) constituting the filling yarn 30. Examples of such processing include stretching processing and crimping processing.

[0132] In addition, the composite twisted yarn includes two or more spun yarns (spun yarns) and / or long yarns, and specifically, there are composite twisted yarns of two or more spun yarns (spun 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, composite twisted yarns of one or more spun yarns, one or more monofilament yarns and one or more multifilament yarns, etc. In addition, when the composite twisted yarn uses a plurality of spun yarns, they may be the same or different. Similarly, when the composite twisted yarn uses a plurality of long yarns, they may be the same or different.

[0133] In this case, a plurality of raw yarns (spun yarn, multifilament yarn, monofilament yarn) can be plied and paralleled to obtain a target fineness, and the plied and paralleled raw yarns are twisted to obtain a composite twisted yarn. In this case, the twist is not particularly limited, and is, for example, 0.05 times / cm to 20.0 times / cm, preferably 0.1 times / cm to 10.0 times / cm.

[0134] Among the above, each yarn constituting the filling yarn 30 is preferably a yarn including a spun yarn and / or a multifilament yarn, and more preferably a composite twisted yarn of one or more spun yarns and one or more multifilament yarns, a composite twisted yarn twisted with two or more spun yarns, or a spun yarn. This makes it possible to more appropriately adjust the arrangement of the seam loops 21 of the papermaking felt base member 1, which helps to improve the joining operability of the seam loop portion 20, and more reliably prevent the short fibers near the seam portion 50 from falling off.

[0135] In particular, the first filling yarn is preferably a yarn including a spun yarn and / or a multifilament yarn, more preferably a spun yarn, a composite twisted yarn twisted with two or more spun yarns, or a composite twisted yarn twisted with one or more spun yarns and one or more multifilament yarns, and further preferably a composite twisted yarn twisted with a spun yarn or two or more spun yarns. This makes it possible to more appropriately adjust the arrangement of the seam loops 21 of the papermaking felt base member 1, which helps to improve the joining operability of the seam loop portion 20, and more reliably prevent the short fibers near the seam portion 50 from falling off.

[0136] In particular, the second filling yarn is preferably a yarn including a spun yarn and / or a multifilament yarn, more preferably a composite twisted yarn obtained by twisting a spun yarn, two or more spun yarns, or a composite twisted yarn obtained by twisting one or more spun yarns with one or more multifilament yarns, and even more preferably a composite twisted yarn obtained by twisting one or more spun yarns with one or more multifilament yarns. This makes it possible to more appropriately adjust the arrangement of the seam loops 21 of the papermaking felt base member 1, which helps to improve the joining operability of the seam loop portion 20, and more reliably prevent the falling of short fibers near the seam portion 50.

[0137] The material of each yarn constituting the filling yarn 30 is not particularly limited. For example, polyester (polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), aliphatic polyamide (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, polypropylene, polyetheretherketone, polytetrafluoroethylene, polyethylene, wool, cotton, metal, etc. can be used alone or in combination of two or more.

[0138] In addition, regarding each yarn constituting the filling yarn 30 (the first filling yarn 31 and the second filling yarn 32), any two or more of them may be made of the same material, or may be made of different materials from each other.

[0139] Among the above, each yarn (the first filling yarn 31 and the second filling yarn 32) constituting the filling yarn 30 preferably includes one or more selected from the group consisting of polyester, aliphatic polyamide and aromatic polyamide (aramid), and more preferably includes one or more selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610 and polyamide 612. As a result, the arrangement of the seam loops 21 is easily aligned. In addition, the strength near the seam portion 50 is sufficiently maintained, and its dimensional stability is also improved.

[0140] Next, the structure of the woven fabric 10 will be described. In the present embodiment, the woven fabric 10 has a so-called 3 / 11 / 3 double warp structure. With such a structure, the MD yarns 11A and 11B are subjected to an equal force in the cross-machine direction, and the MD yarns 11A and 11B are less likely to be displaced in the cross-machine 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.

[0141] In addition, in this specification, when observing from one side of the woven fabric, in the machine direction from the seam loop side toward the woven fabric, for a certain point where the MD yarn and the CD yarn intersect, the repetition of continuously observing the MD yarn a times and then continuously observing the CD yarn b times is recorded as a / b. In this case, the MD yarn passes over the a CD yarn and then passes under the b CD yarn repeatedly. In addition, in the repetition of the weave, after the CD yarn is continuously observed b times, the MD yarn is observed c times, and then the CD yarn is observed d times, the repetition is recorded as a / b / c / d. At this time, the MD yarn passes over the a CD yarn, passes under the b CD yarn, passes over the c CD yarn, and finally passes under the d CD yarn, and the repetition of the repetition is repeated.

[0142] In addition, when there are multiple layers of warp yarn, the above-mentioned record is recorded from the surface side with blanks sandwiched between them when viewed from one side of the woven fabric. Figure 2 In the woven fabric 10, for the MD yarn 11A, the MD yarn 11A is observed three times, and then the CD yarn 13 is observed once, which is recorded as 3 / 1. In addition, for the MD yarn 11B, the MD yarn 11B is observed once, and then the CD yarn 13 is observed three times, which is recorded as 1 / 3. Therefore, the fabric structure of the woven fabric 10 is recorded as 3 / 11 / 3. In addition, when the same record is continuous in multiple structures, the repeated record can be omitted. For example, when the warp double structure is recorded as 1 / 11 / 1, it can be recorded as 1 / 1 warp double structure.

[0143] In addition, the MD yarns 11A, 11B and the CD yarn 13 may be yarns of any form, for example, twisted yarns of multifilaments or monofilaments, ply-ply yarns of multifilaments and / or monofilaments, and single yarns of monofilaments, etc. In addition, similarly to the filling yarn 30, for example, it may be a spun yarn (spun yarn) and / or a filament yarn, or a composite twisted yarn including two or more spun yarns (spun yarns) and / or filament yarns.

[0144] From the viewpoint of ensuring the strength of the papermaking felt 100 and the papermaking felt base member 1 and the loop strength, the MD yarns 11A, 11B and the CD yarns 13 preferably all include filament yarns. In addition, the MD yarns 11A, 11B and the CD yarns 13 may be yarns of different forms or yarns of the same form. In addition, the MD yarns 11A may be composed of yarns of the same or multiple forms, the MD yarns 11B may be composed of yarns of the same or multiple forms, and the CD yarns 13 may be composed of yarns of the same or multiple forms.

[0145] Among the above-mentioned MD yarns 11A and 11B, it is preferable that they include monofilaments for the purpose of improving the strength of the seam loop 21 , and it is preferable that they include twisted yarns of monofilaments for the purpose of preventing the short fibers of the seam loop portion 20 and the seam portion 50 from falling off.

[0146] Among the above, the CD yarn 13 preferably includes monofilaments for the purpose of ensuring water permeability of the papermaking felt 100, and preferably includes twisted yarns of monofilaments for the purpose of preventing short fibers of the papermaking felt 100 from falling off.

[0147] The fineness of the MD yarns 11A, 11B and the CD yarns 13 is not particularly limited, but is 500 dtex to 3000 dtex, preferably 700 dtex to 2000 dtex, and more preferably 800 dtex to 1500 dtex.

[0148] In addition, the materials constituting the MD yarns 11A, 11B and the CD yarns 13 are not particularly limited, and for example, the materials mentioned above for the filling yarn 30 may be used alone or in combination of two or more. With regard to the MD yarns 11A, 11B and the CD yarns 13, any two or more of them may be composed of the same material, or may be composed of different materials.

[0149] Among the above, the MD yarns 11A, 11B and the CD yarns 13 preferably include one or more selected from the group consisting of polyester, aliphatic polyamide and aromatic polyamide (aramid), and more preferably include one or more selected from the group consisting of 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 papermaking felt base member 1 can be made sufficient.

[0150] The yarn density of the MD yarns 11A, 11B and the CD yarn 13 is not particularly limited and can be appropriately set. The yarn density of the MD yarns 11A, 11B is, for example, 30 yarns / 5 cm to 200 yarns / 5 cm in total, preferably 60 yarns / 5 cm to 120 yarns / 5 cm. The yarn density of the CD yarn 13 is, for example, 20 yarns / 5 cm to 200 yarns / 5 cm, preferably 30 yarns / 5 cm to 120 yarns / 5 cm.

[0151] The thickness of the papermaking felt base member 1 is not particularly limited, and may be, for example, 0.2 mm to 3.5 mm, preferably 0.5 mm to 3.0 mm. The weight per unit area of ​​the papermaking felt base member 1 is not particularly limited, and may be, for example, 150 g / m 2 Above 1200g / m 2 Below, preferably 300g / m 2 Above 1000g / m 2 the following.

[0152] The weave, thickness and basis weight of the papermaking felt base member 1 are appropriately set according to the strength, porosity and air permeability of the papermaking felt 100 and the properties aimed at the traceability of the papermaking felt base member 1 .

[0153] The size of the papermaking felt base member 1 as described above is not particularly limited, and is set, for example, in accordance with the size of a papermaking machine.

[0154] The papermaking felt base member 1 described above includes: an end-shaped woven fabric 10 including MD yarns 11A, 11B and CD yarns 13; seam loops 21 formed by folding back the MD yarns 11A, 11B at both ends in the machine direction of the woven fabric 10; and a plurality of stuffing yarns 30 (stuffing yarns 31, 32) disposed between the CD yarns 13 disposed at the endmost portions of the woven fabric 10 and the seam loops 21 at both ends in the machine direction of the woven fabric 10. The fineness of the stuffing yarn 31 disposed on the seam loop 21 side is smaller than the fineness of the stuffing yarn 32 disposed on the CD yarn 13 side relative to the stuffing yarn 31.

[0155] Thus, during the needling when the short fiber layer 60 is stacked, the stitching effect received by the filling yarns 31 and 32 can be set to the same level, and the balance of the forces received by the MD yarns 11A and 11B from the filling yarns 31 and 32 can be appropriately adjusted. Therefore, it is possible to suppress the occurrence of disorder in the arrangement of the seam loops 21. Moreover, as a result, the filling yarns 31 and 32 can fully exert the desired effect, and the papermaking felt base member 1 does not impair the operability of joining the seam loop portion 20, and the occurrence of seam marks from the seam portion 50 during pressing is suppressed.

[0156] <2. Papermaking Felt>

[0157] Next, the papermaking felt according to the present embodiment will be described. Figure 5 This is a machine direction cross-sectional view of the vicinity of a seam portion of the papermaking felt according to the present embodiment.

[0158] like Figure 5 As shown, the papermaking felt 100 of the present embodiment includes a papermaking felt base member 1 and a short fiber layer 60 laminated on the papermaking felt base member 1 .

[0159] The short fiber layer 60 includes a wet paper side surface layer 61 stacked on the wet paper contact side of the papermaking felt 100 in the papermaking felt base component 1, a wet paper side inner layer 62 arranged in the woven fabric 10 of the papermaking felt base component 1, and a roll side layer 63 stacked on the roll contact side of the papermaking felt 100.

[0160] Furthermore, a flap 64 as a cut-in portion is formed in the cross-machine direction near the joint portion 50 of the short fiber layer 60, and the short fiber layer 60 becomes discontinuous in the flap 64. Thus, when the core wire 40 is removed from the joint portion 50, the short fiber layer 60 also becomes an end-shaped state together with the papermaking felt base member 1, and as a result, the papermaking felt 100 becomes an end-shaped state. On the other hand, when the papermaking felt 100 is placed in a papermaking machine, the joint loop portions 20 of the papermaking felt 100 with an end-shaped state are engaged with each other, and the core wire 40 is inserted, thereby forming the joint portion 50, and the papermaking felt 100 becomes an endless state.

[0161] The material of the short fibers constituting each layer of the short fiber layer 60 is not particularly limited, and polyester (polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), aliphatic polyamide (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, polypropylene, polyetheretherketone, polytetrafluoroethylene, polyethylene, wool, cotton, metal, etc. can be used alone or in combination of two or more. Among the above substances, polyamide is preferred as the short fiber material from the viewpoints of wear resistance, compression recovery, impact resistance, hydrophilicity, hydrolysis resistance, chemical resistance, etc.

[0162] The fineness of the short fibers constituting the wet paper side surface layer 61 is not particularly limited, and is, for example, 0.1 dtex or more and 200 dtex or less. In addition, the fineness of the short fibers constituting the wet paper side inner layer 62 is not particularly limited, and is, for example, 3 dtex or more and 200 dtex or less. In addition, 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. In addition, the wet paper side surface layer 61 and the wet paper side inner layer 62 may be integrated into the same layer without being limited to the illustrated embodiment.

[0163] The total weight per unit area of ​​the wet paper side surface layer 61 and the wet paper side back layer 62 is 100 g / m 2 Above 1500g / m 2 Below, preferably 300g / m 2 Above 1200g / m 2 Below, more preferably 400g / m 2 Above 1000g / m 2 The fineness and basis weight of the short fibers of the wet paper side surface layer 61 and the wet paper side back layer 62 are appropriately set according to the desired properties such as the strength, porosity and air permeability of the papermaking felt 100 and the surface properties of the short fiber layer of the wet paper side surface layer 61 .

[0164] The fineness of the short fibers constituting the roller side layer 63 is not particularly limited, and is, for example, 3 dtex or more and 150 dtex or less. The weight per unit area of ​​the short fibers on the roller side is not particularly limited, and can be, for example, 50 g / m 2 Above 500g / m 2 the following.

[0165] The weight per unit area of ​​the papermaking felt 100 is not particularly limited, but is, for example, 250 g / m 2 Above 3000g / m 2 Below, preferably 400g / m 2 Above 2000g / m 2The thickness of the papermaking felt 100 is not particularly limited, but is, for example, 1 mm to 6 mm, preferably 2 mm to 4 mm.

[0166] The papermaking felt 100 described above can be obtained by laminating short fibers formed into a film by a card or the like on both sides of a papermaking felt base member 1 .

[0167] Specifically, first, a film-like object made of short fibers by card or the like is stacked on the papermaking felt base member 1, and the short fibers are entangled and integrated by needle punching, and the short fiber layer 60 is stacked on the papermaking felt base member 1. In this way, the precursor of the papermaking felt 1 is completed. Next, the precursor of the papermaking felt 1 is appropriately chemically treated, heat-set, and pressed to remove the core thread, cut the short fibers of the seam loop portion 20, and form the flaps 64, thereby obtaining the papermaking felt 1. In addition, the papermaking felt 100 is wound in a roll shape, packaged, and stored before use.

[0168] The papermaking felt 100 described above includes the papermaking felt base member 1. Therefore, the arrangement of the seam rings 21 of the papermaking felt 100 is suppressed from being disordered. For example, even in a situation where the papermaking felt 100 is packed and stored for a long time in a papermaking company, the arrangement of the seam rings 21 is suppressed from being disordered. Therefore, the workability when joining the seam rings 21 is good.

[0169] Furthermore, since the arrangement of the seam loops 21 is suppressed, the seam marks generated in the wet paper in contact with the papermaking felt 100 during pressing are suppressed. In addition, since the arrangement of the seam loops 21 is suppressed, the short fibers are well suppressed from falling off from the short fiber layer 60.

[0170] <3. Modifications>

[0171] Next, several modified examples of the base member for papermaking felt and the papermaking felt of the above-mentioned embodiment are described. Below, the description is centered on the differences from the above-mentioned embodiment, and the description of the same matters is omitted. In addition, the modified examples described below or the features of the above-mentioned embodiment can be applied separately, or two or more can be combined and applied within the scope allowed by the technical aspect.

[0172] (3.1. First Modification)

[0173] In the above embodiment, an example is described in which two filling yarns 31 and 32 are arranged at each end of the papermaking felt base member 1, but the present invention is not limited to this, and the papermaking felt base member may have three or more filling yarns at each end. Figure 6 An example is shown in FIG.

[0174] Figure 6This is a machine direction cross-sectional view showing a part of a base member for papermaking felt according to a modified example of the present invention. Figure 6 The illustrated papermaking felt base member 1A is different from the above-described papermaking felt base member 1 in the number of filling yarns 30A, but is otherwise the same. The filling yarns 30A will be described in detail below, and descriptions of the same items will be omitted.

[0175] like Figure 6 As shown, the papermaking felt base member 1A has three filling yarns 30A (filling yarns 31A, 32A, 33A) arranged along the cross-machine direction between the seam loop 20 and the CD yarn 13 at the machine direction end. 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.

[0176] Thus, the stitching effect by needling can be made uniform in the filling yarn 30A, and the balance of the force received by the MD yarns 11A and 11B from the filling yarns 31A, 32A, and 33A can be appropriately adjusted. Therefore, it is possible to suppress the disorder in the arrangement of the seam loops 21. As a result, the filling yarns 31A, 32A, and 33A can fully exert the desired effect, and the base member 1A for papermaking felt does not impair the operability of joining the seam loop portion 20, and the occurrence of seam marks caused by the formed seam portion is suppressed.

[0177] In addition, the fineness of any one of the filling yarns 32A and 33A may be larger than the fineness of the filling yarn 31A, but the fineness of the filling yarn 31A is preferably smaller than the fineness of the filling yarn 32A adjacent to the filling yarn 31A. In this way, the above-mentioned effect can be more reliably obtained by making the fineness of the filling yarn 32A adjacent to the filling yarn 31A as the first filling yarn larger.

[0178] Furthermore, in the filling yarn 30A, the fineness of each of the filling yarns 31A and 32A is preferably smaller than the fineness of the filling yarns 32A and 33A on the adjacent CD yarn 13 side.

[0179] In addition, the present invention is not limited to the above-mentioned embodiments and Figure 6 In the modified example shown, the number of the filling yarns can be set to any number. For example, at one end of the papermaking felt base member, the filling yarns can be arranged in a range of 2 to 10, preferably 2 to 5.

[0180] In addition, in the above-mentioned embodiments and Figure 6In the modified example shown, a structure is described in which a plurality of filling yarns 30 and 30A are arranged at both ends of the woven fabric 10 to satisfy the relationship between the first filling yarn and the second filling yarn, but 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, and at one end of the woven fabric, there may be only one filling yarn.

[0181] (3.2. Fabric structure of woven cloth)

[0182] In the above-described embodiment, the woven fabric 10 of the papermaking felt base member 1 has been described as having a 3 / 11 / 3 double weave structure, but the present invention is not limited thereto, and the woven fabric may have any weave structure.

[0183] The fabric structure of the woven fabric used as the base member for papermaking felt is not particularly limited as described above, and examples include warp double structure such as 3 / 11 / 3 warp double structure, 5 / 11 / 1 warp double structure, 2 / 11 / 2 warp double structure (2 / 11 / 2 warp 1.5 structure), 5 / 1 / 1 / 1 / 5 / 1 / 1 warp double structure, weft double structure such as 3 / 11 / 3 weft double structure, 5 / 11 / 1 weft double structure, 2 / 11 / 2 weft double structure, warp double structure such as 1 / 1 warp double structure, and triple or more multilayer structures.

[0184] As described above, any weave structure can be used as the woven fabric of the papermaking felt base member, and the arrangement relationship between the weave structure and the seam loops will be described below.

[0185] Figure 7 to Figure 9 This is a cross-sectional view in the machine direction for explaining the weave structure of a woven fabric of a base member for a papermaking felt according to a modified example of the present invention. Figures 7 to 9 Each of the woven fabrics 10B to 10H has a two-layer or multi-layer structure of n times, and the woven fabrics 10B to 10H form the first surface 15 and the second surface 17. In addition, n is an integer of 2 or more.

[0186] Figure 7 The woven fabric 10B shown has a repetition including a pattern, and the pattern is a pattern in which the CD yarn 13 passes between the ath MD yarn 11 and the a+1th MD yarn 11 from the first surface 15 of the woven fabric 10B, passes through the first surface 15 side of the first MD yarn from the first surface 15, and then passes between the bth MD yarn 11 and the b+1th MD yarn 11 from the first surface 15 (pattern I-1). It should be noted that Figure 7 In the formula (a), a and b are any integers greater than 1 and less than n-1, and a≠b.

[0187] Figure 7The woven fabric 10C shown has a repetition including a pattern, which is a pattern as follows: after the CD yarn 13 passes from the first side 15 of the woven fabric 10C between the a-th MD yarn 11 and the a+1-th MD yarn 11, it passes from the first side 15 to the first side 15 side of the first MD yarn, and then passes from the first side 15 to the second side 17 side of the n-th MD yarn 11 (pattern I-2).

[0188] Figure 7 The woven fabric 10D shown has a repetition including a pattern, which is a pattern in which, after the CD yarn 13 passes from the first surface 15 of the woven fabric 10D through the second surface 17 side of the nth MD yarn 11, it passes from the first surface 15 through the first surface 15 side of the first MD yarn, and then passes from the first surface 15 between the bth MD yarn 11 and the b+1th MD yarn 11 (pattern I-3).

[0189] exist Figure 7 In the woven fabrics 10B to 10D of the patterns I-1 to I-3 shown, the CD yarn 13 is folded back on the MD yarn 11 located above the paper surface in the center of the figure, but the angles of the CD yarn 13 with respect to the thickness direction are different before and after the CD yarn 13 is folded back on the MD yarn 11. In such a case, a force in the cross-machine direction is inevitably applied from the CD yarn 13 to the folded-back MD yarn 11 in the center, and as a result, the MD yarn 11 is easily deviated in the cross-machine direction, and the seam loop 21 located on the extension line of the MD yarn 11 is easily tilted.

[0190] However, in the present invention, the arrangement of the seam loops 21 is fixed by using a specific filling yarn, thereby preventing the seam loops 21 from tilting. That is, when a woven fabric having a woven structure including the repetition of the above-mentioned patterns I-1 to I-3 is used, the effect of the present invention is more significantly exerted.

[0191] then, Figure 8 The woven fabric 10E shown has a repetition including a pattern, which is a pattern in which after the CD yarn 13 passes from the first side 15 of the woven fabric 10E between the a-th MD yarn 11 and the a+1-th MD yarn 11, or passes from the first side 15 to the second side 17 side of the n-th MD yarn 11 (dashed line), it passes from the first side 15 to the first side 15 side of the first MD yarn a plurality of times (pattern II-1).

[0192] Figure 8 The woven fabric 10F shown has a repetition including a pattern, which is a pattern in which, after the CD yarn 13 passes through the first surface 15 side of the first MD yarn 11 from the first surface 15 for a plurality of times, it passes from the first surface 15 between the ath MD yarn 11 and the a+1th MD yarn 11 or passes from the first surface 15 through the second surface 17 side of the nth MD yarn 11 (dashed line) (pattern II-2).

[0193] exist Figure 8In the woven fabrics 10E and 10F of the patterns II-1 and II-2 shown in the figure, when the CD yarn 13 is folded back on the MD yarn 11 located above the paper surface in the center of the figure, the MD yarn 11 is easily loaded with a force in the cross-machine direction. As a result, the MD yarn 11 is easily deviated in the cross-machine direction, and the seam loop 21 located on the extension line of the MD yarn 11 is easily tilted. However, in the present invention, by using a specific filling yarn, even if Figure 8 When the patterns II-1 and II-2 shown are included in the woven fabric, the arrangement of the seam loops 21 is also fixed, and the inclination of the seam loops 21 is prevented.

[0194] Fig. 9 The woven fabric 10G shown has a repetition including a pattern, which is a pattern in which the CD yarn 13 passes from the first surface 15 of the woven fabric 10G between the a-th MD yarn 11 and the a+1-th MD yarn 11, 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 between the a-th MD yarn 11 and the a+1-th MD yarn 11 (pattern III-1).

[0195] also, Fig. 9 The woven fabric 10H shown has a repetition including a pattern, which is a pattern in which, after the CD yarn 13 passes from the first surface 15 of the woven fabric 10H through the second surface 17 side of the n-th MD yarn 11, it passes from the first surface 15 through the first surface 15 side of the first MD yarn, and then passes from the first surface 15 through the second surface 17 side of the n-th MD yarn 11 (pattern III-2).

[0196] exist Fig. 9 In the woven fabrics 10G and 10H of the patterns III-1 and III-2 shown, the CD yarn 13 is folded back on the MD yarn 11 located above the paper surface at the center of the figure, and the angles of the CD yarn 13 with respect to the thickness direction are the same before and after the folding back on the MD yarn 11. Therefore, the MD yarn 11 is not easily subjected to the force in the cross-machine direction during the process of the CD yarn 13 being folded back on the MD yarn 11 located above the paper surface at the center of the figure, and as a result, the seam loop 21 located on the extension line of the MD yarn 11 is not easily tilted. However, even in the case where the seam loop 21 is not easily tilted due to the fabric structure of the woven fabrics 10G and 10H, there is a case where the seam loop 21 is tilted due to the external force during needle punching or storage. In such a case, in the present invention, the arrangement of the seam loop 21 is fixed by using a specific filling yarn, and the seam loop 21 is prevented from tilting.

[0197] In addition, the warp-weft double weave and the warp-weft multiple weave have a portion where the upper weave and the lower weave are not fixed between the layers, and the upper and lower layers between the layers are easily offset in the structure of the fabric weave. Therefore, the MD yarns of the upper and lower layers are easily offset from each other, and the seam loops on the extension line of the MD yarns are easily tilted. However, in the present invention, by using a specific filling yarn, the arrangement of the seam loops is fixed even in the case of a woven fabric using the warp-weft double weave, and the tilting of the seam loops is prevented.

[0198] In addition, in the double warp structure, the structure in which the upper MD yarn and the lower MD yarn are not located at the same position in the thickness direction, and the lower MD yarn is arranged between the upper MD yarns when the woven fabric is viewed from above is referred to as a "1.5-fold warp structure". Similarly, in the double weft structure, the structure in which the upper CD yarn and the lower CD yarn are not located at the same position in the thickness direction, and the lower CD yarn is arranged between the upper CD yarns when the woven fabric is viewed from above is referred to as a "1.5-fold weft structure". Examples of the 1.5-fold warp structure include a 2 / 11 / 2 1.5-fold warp structure.

[0199] Among the above, in the 1.5-weight weave, in terms of the structure of the fabric weave, the positions of the upper MD yarn and the lower MD yarn in the machine direction are different, and as a result, the seam loops formed by the upper MD yarn and the lower MD yarn are prone to be inclined with respect to the thickness direction. However, in the present invention, by using a specific filling yarn, even in the case of a woven fabric with a 1.5-weight weave, the arrangement of the seam loops is fixed, and the inclination of the seam loops is prevented.

[0200] Furthermore, the woven fabric of the felt base member may include MD yarns that do not contribute to the formation of seam loops.

[0201] (3.3. Third Modification)

[0202] In the above-mentioned embodiment, it is assumed that two filling yarns 31 and 32 are formed at the end of the papermaking felt base member 1. Figure 4 Although the filling yarn is woven into the MD yarns 11A and 11B in the weave structure shown in the above description, the present invention is not limited to this, and the filling yarn can be woven into the MD yarns in any weave structure.

[0203] As a fabric structure formed by the filling yarn and the MD yarn, it is preferred that, for example, the fabric structure has the above Fig. 9 The CD yarns are replaced with filling yarns in the repeated weaves of the patterns III-1 or III-2 shown in the drawings. Such weaves can sufficiently fix the CD yarns forming the seam loops, and can more reliably fix the arrangement of the seam loops.

[0204] As such a fabric structure, Figure 4 The 1 / 1 shown is 2-fold organized, etc.

[0205] (3.4. Fourth Modification)

[0206] In the above embodiment, the short fiber layer 60 of the papermaking felt 100 is described as having the roll-side layer 63 , but the present invention is not limited thereto, and the roll-side layer 63 may be omitted.

[0207] As mentioned above, although the present invention has been described in detail based on the preferred embodiments, the present invention is not limited thereto, and each structure can be replaced with an arbitrary structure that can exert the same function, or an arbitrary structure can be added.

[0208] [Example]

[0209] The present invention will be further specifically described below by way of examples, but the present invention is not limited to these examples.

[0210] <1. Production of papermaking felt>

[0211] (Example)

[0212] First, a base member for papermaking felt according to the example was prepared as follows.

[0213] The structure of the woven cloth is as follows: In addition, at both ends of the woven cloth, seam loops are formed.

[0214] MD yarn: 1000dtex polyamide 6 monofilament single yarn, 90 strands / 5cm

[0215] CD yarn: 330dtex polyamide 6 monofilament yarns twisted together, 80 yarns / 5cm

[0216] Fabric structure of MD yarn and CD yarn: 2 / 11 / 2 warp double weave (warp 1.5 weave)

[0217] Weight per unit area: 450g / m 2

[0218] Next, prepare the following filling yarn, and weave it in the MD yarn between the seam loop and the woven fabric to form a 1 / 1 warp double structure. In addition, when weaving into the MD yarn, the first filling yarn is arranged on the seam loop side, and the second filling yarn is arranged on the CD yarn side.

[0219] Filling yarn: 2 pieces of first filling yarn and second filling yarn

[0220] First filling yarn: A polyamide 6 spun yarn (588 dtex) twisted with a Z twist of 0.5 times / cm was twisted with two S twists of 3.2 times / cm to obtain a first filling yarn (1150 dtex).

[0221] Second filling yarn: A twisted yarn (1150 dtex) of polyamide 6 spun yarn (588 dtex) twisted with 0.5 times / cm Z twist was prepared by twisting two spun yarns with 3.2 times / cm S twist. Then, one of the twisted yarns of the spun yarn was twisted with two polyamide 6 multifilament yarns (7d×30 yarns, 210 dtex) with 3.0 times / cm S twist to obtain a second filling yarn (1695 dtex).

[0222] Next, the papermaking felt base member is needled to entangle the short fibers and complete the precursor of the papermaking felt. In addition, as the short fiber layer formed on the papermaking felt, a wet paper side surface layer, a wet paper side back layer, and a roll side layer are formed. The short fiber layer is formed by stacking the following number of layers of cards having a short fiber structure and a unit area weight set in the following manner for each layer, and entangled with the papermaking felt base member.

[0223] Wet paper side surface card: 15dtex polyamide 66 short fiber; unit area weight: 100g / m 2 ; 2nd floor

[0224] Wet paper side inner layer card: 22dtex polyamide 66 short fiber, unit weight: 100g / m 2 ; 3 floors

[0225] Roller side card: 22dtex polyamide 66 staple fiber; unit area weight: 100g / m 2 ; 2nd floor

[0226] The precursor of the papermaking felt is chemically treated, heat-set, and pressed to remove the core wire, cut the short fibers of the seam loop, and form flaps to complete the papermaking felt of the embodiment. The weight per unit area of ​​the papermaking felt is 1100 g / m 2 , thickness is 2.65mm, ventilation is 27.5cc / m 2 / sec.

[0227] (Comparative Example)

[0228] The same procedures as in the examples were performed except that the structure of the filling yarn was changed as follows, thereby obtaining a base member for a papermaking felt and a papermaking felt of a comparative example.

[0229] A twisted yarn (1150 dtex) of a polyamide 6 spun yarn (588 dtex) twisted with a Z twist of 0.5 times / cm and two spun yarns twisted with an S twist of 3.2 times / cm was prepared. Then, one of the twisted yarns of the spun yarn was twisted with two polyamide 6 multifilament yarns (7d×30 yarns, 210 dtex) with an S twist of 3.0 times / cm 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.

[0230] <2. Evaluation>

[0231] The Examples and Comparative Examples were evaluated according to the following evaluation methods.

[0232] (1) The degree of alignment of the seam rings

[0233] The papermaking felts of the examples and the papermaking felts of the comparative examples were observed with an optical microscope without inserting the core wire through the seam loops, and the degree of alignment of the seam loops was evaluated. Fig.14 and Fig.15 The results are shown in . Fig.14 This is an enlarged photographic image of the seam loop portion of the papermaking felt of the Example. Fig.15 This is an enlarged photographic image of a seam loop portion of a papermaking felt of a comparative example.

[0234] like Fig.14 , 15 As shown, the seam loops of the papermaking felt of the embodiment are arranged in a regular pattern compared to the papermaking felt of the comparative example. It can be understood that the papermaking felt of the embodiment is superior in workability when joining the seam loops when forming the seam portion compared to the papermaking felt of the comparative example.

[0235] (2) Core wire insertion resistance evaluation

[0236] For the papermaking felts of the examples and the comparative examples, the core wire ( The core wire insertion resistance value of the comparative example was 7.50 kgf / 70 cm, while the core wire insertion resistance value of the example was 0.81 kgf / 70 cm. Compared with the papermaking felt of the comparative example, the seam rings of the papermaking felt of the example were arranged neatly, and the core wire insertion resistance value was significantly reduced. It can be understood that the papermaking felt of the example is superior in operability when joining the seam rings when the seam portion is formed, compared with the papermaking felt of the comparative example.

[0237] (3) Trace evaluation

[0238] The traceability of the papermaking felts of the examples and the comparative examples was evaluated. Fig.16As shown in (a), a carbon paper 301, paper 302 and a mat 303 of short fibers (100 g / m 2 Here, the carbon paper 301 and the paper 302 are stacked in such a manner as to be arranged on the seam portion 50 of the papermaking felt 1.

[0239] Then, if Fig.16 As shown in (b), for a papermaking felt 1 provided with carbon paper 301, paper 302 and pad 303, two pressing rollers 400 with a diameter of 100 mm are used to press at a pressing speed of 5 cm / sec and a linear pressure of 50 kgf / cm, and the shape of the seam of the papermaking felt 1 is transferred onto the paper to form a seam mark.

[0240] In forming the seam mark, the pressing is performed at a slower pressing speed than the pressing of a general papermaking machine in which the seam mark is clearly formed.

[0241] exist Fig.17 and Fig.18 The results are shown in . Fig.17 This is an enlarged photographic image of the seam trace transferred to the paper pressed using the papermaking felt of the example. Fig.18 This is an enlarged photographic image of the seam traces transferred to paper pressed using the papermaking felt of the comparative example. Fig.17 , 18 As shown, the transferred seam marks of the papermaking felt of the example are smaller than those of the papermaking felt of the comparative example. Therefore, it can be understood that the papermaking felt of the example suppresses the formation of seam marks compared with the papermaking felt of the comparative example.

[0242] Description of Reference Numerals

[0243] 1.1A Base parts for papermaking felt

[0244] 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H fabrics

[0245] 11, 11A, 11B machine direction yarn (MD yarn)

[0246] 13 Machine cross direction yarn (CD yarn)

[0247] 20 Seam loop

[0248] 21 Seam loop

[0249] 30, 30A, 31, 31A, 32, 32A, 33A filling yarn

[0250] 40 core wire

[0251] 50 Seam

[0252] 60 Short fiber layer

[0253] 61 Wet paper side surface

[0254] 62 Wet paper side inner side

[0255] 63 Roller side layer

[0256] 100 Papermaking Felt

Claims

1. A base member for papermaking felt, comprising: An end-shaped woven fabric comprising machine direction yarns running back and forth in the machine direction and cross-machine direction yarns arranged in the cross-machine direction and woven into the machine direction yarns, A plurality of core thread insertion loops are formed at both ends of the woven fabric in the machine direction by folding back the machine direction yarn, through which the core thread can be inserted. as well as a plurality of filling yarns disposed in the cross-machine direction at at least one end of the woven fabric, between the cross-machine direction yarn disposed at the endmost end of the woven fabric and the core thread insertion ring; Among the plurality of filling yarns, a first filling yarn disposed closest to the core yarn insertion loop has a fineness smaller than a second filling yarn disposed on the cross-machine direction yarn side relative to the first filling yarn.

2. The papermaking felt base member according to claim 1, The second fill yarn is adjacent to the first fill yarn.

3. The base member for papermaking felt according to claim 1, The first filling yarn has a fineness of 240 dtex or more and 2000 dtex or less.

4. The base member for papermaking felt according to claim 1, The second filling yarn has a fineness of 330 dtex or more and 2090 dtex or less.

5. The base member for papermaking felt according to claim 1, The fineness of the first filling yarn is smaller than the fineness of the second filling yarn by 90 dtex or more and 1850 dtex or less.

6. The base member for papermaking felt according to claim 1, A 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 papermaking felt according to claim 1, At the at least one end portion 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 papermaking felt according to claim 1, The second filling yarn includes spun yarn and / or multifilament yarn.

9. The base member for papermaking felt according to claim 1, The first filling yarn includes spun yarn and / or multifilament yarn.

10. The base member for papermaking felt according to claim 1, The plurality of filling yarns are woven into the machine direction yarns in such a manner as to form a 2-fold warp structure.

11. The papermaking felt base member according to claim 10, The machine direction yarn includes an upper yarn and a lower yarn constituting the core thread insertion loop, The double warp structure is as follows: it contains a repeating unit, wherein the multiple filling yarns respectively pass through the side of one of the upper yarns of the machine direction yarn opposite to the lower yarn side and pass through the side of an adjacent lower yarn opposite to the upper yarn, and the adjacent filling yarns do not pass through the side of the same upper yarn opposite to the lower yarn side.

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

13. The papermaking felt base member according to claim 1, The woven fabric has a warp n-fold structure. The invention comprises a repetition of a pattern, wherein the machine cross direction yarn passes from the first side, which is one side of the woven fabric, between the a-th machine direction yarn and the a+1-th machine direction yarn, passes from the first side to the first side side of the first machine direction yarn, and then passes from the first side to between the b-th machine direction yarn and the b+1-th machine direction yarn, or The invention comprises a repetition of a pattern, wherein the machine cross direction yarn passes from the first side between the a-th machine direction yarn and the a+1-th machine direction yarn, passes from the first side through the first side of the first machine direction yarn, and then passes from the first side through the second side of the other side of the woven fabric of the n-th machine direction yarn, or comprising a repeat of a pattern, the pattern being a pattern in which the cross-machine direction yarn passes from the first side through the second side side of the nth machine direction yarn, passes from the first side through the first side side of the first machine direction yarn, and then passes from the first side between the bth machine direction yarn and the b+1th machine direction yarn, in, n is an integer greater than or equal to 2, a and b are arbitrary integers greater than or equal to 1 and less than or equal to n-1, and a≠b.

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

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