JP7293099B2 - Seam felt for papermaking - Google Patents

Description

The present disclosure relates to a papermaking seam felt that includes loops formed at opposite ends to be connected together.

A papermaking felt is used in a press part for mechanically squeezing moisture from a wet paper in a paper machine, a pulp machine, or the like, and is used for conveying and squeezing the wet paper. A papermaking felt is formed by integrating a base fabric in which warps and wefts are woven together with a batt fiber layer made of short fibers by needling. Papermaking felt has wet paper transportability, water squeezability, surface property that does not leave marks on the paper surface (paper surface property), initial familiarity related to the time from being attached to equipment until it reaches a desirable state, and antifouling properties. , and durability are required.

In order to improve the workability of attaching the felt to the paper machine, a so-called seam felt is widely used, in which a piece of felt with ends is drawn into a running path of the felt, the so-called felt run, and then the ends are connected to each other to make it endless. Widespread. In this type of seam felt, the loops formed at both ends in the warp direction by folding back the warp yarns constituting the base fabric are alternately arranged so that the loop holes are aligned with each other, and the core wires are passed through the loop holes to connect the both ends. A common configuration is

When the amount of voids in the felt increases, water squeezability improves. A seam base fabric for papermaking felt is known in which a second base fabric layer is provided on the papermaking side of the first base fabric layer in addition to the first base fabric layer containing loops in order to increase the amount of voids in the seam felt. ing.

Patent Literature 1 discloses a base fabric 100a as shown in FIG. 4(A). The base fabric 100a includes a first base fabric layer 101 and a second base fabric layer 102a. The first base fabric layer 101 and the second base fabric layer 102a are laminate-type base fabric layers that are not bonded by weaving (without binding yarn), and are bonded together with the batt fiber layer by needles. . The first base fabric layer 101 includes warp yarns 103 and weft yarns 104 woven together, and loops 105 are formed by folding back the warp yarns 103 at both ends in the lengthwise direction. The loops 105 at both ends are aligned with each other and the core wire 106 is passed through the loops 105 to form an endless shape. The second backing layer 102a includes warp yarns 107a and weft yarns 108a interwoven with each other, has no loops 105, and is cut at the seams.

Patent Literature 2 discloses a base fabric 100b as shown in FIG. 4(B). The base fabric 100b includes a first base fabric layer 101 and a second base fabric layer 102b. The second backing layer 102b includes warp yarns 107b and weft yarns 108b interwoven with each other, has no loops 105, and is cut at the seams. The warp yarns 107b interweave the weft yarns 104 of the first base fabric layer 101 to bind the second base fabric layer 102b to the first base fabric layer 101 .

A base fabric 100c as shown in FIG. 4(C) has been proposed. The base fabric 100c includes a first base fabric layer 101 and a second base fabric layer 102c. The second backing layer 102c includes warp yarns 107c and weft yarns 108c interwoven with each other, has no loops 105, and is cut at the seams. The ends of the warp yarns 107c positioned at the seam portion have loops at both ends, but the loops at both ends are not connected by inserting the core wire.

Patent Literature 3 discloses a base fabric 100d as shown in FIG. 4(D). The fabric base 100d includes a first fabric layer 101 and a second fabric layer 102d. The second base fabric layer 102d includes only warp yarns 107d. The warp yarn 107d weaves the weft yarn 104 of the first base fabric layer 101, thereby binding the second base fabric layer 102d to the first base fabric layer 101. As shown in FIG.

Further, base fabrics 100e and 100f as shown in FIGS. 4(E) and 4(F) are actually used. In the base fabric 100e shown in FIG. 4(E), the second base fabric layer 102e consists of only the weft yarns 108e (the weft yarns 108e are arranged in the weft direction and integrated using the molten batt layer). In the base fabric 100f shown in FIG. 4(F), the second base fabric layer 102f is a non-woven fabric base fabric made only of the warp yarns 107f (the warp yarns 107f are arranged in the warp direction and integrated using a molten batt layer). 107 f of warp yarns). The first base fabric layer 101 and the second base fabric layers 102e and 102f are laminated type base fabric layers, and are joined together with the batt fiber layer by needles (the weft 108e and the warp 107f are connected to the first base fabric layer). The weft 104 of 101 is not woven, and the second base fabric layers 102e and 102f are not bonded to the first base fabric layer 101). Also, the first base fabric layer 101 and the second base fabric layers 102e and 102f are used in a form in which they are used upside down.

JP-A-11-100787 Japanese Patent Publication No. 2004-517226 JP 2010-100947 A

The running surface side of the seam felt wears out over time due to contact with a paper machine or the like. In particular, wear on the running surface side of the loop greatly affects the durability of the seam felt. SUMMARY OF THE INVENTION An object of the present invention is to provide a papermaking seam felt with improved durability by suppressing wear of loops.

One embodiment of the present invention comprises a base fabric (2) having loops (6) formed at both ends to be connected to each other, and a batt layer (3) integrated with said base fabric (2). A papermaking seam felt (1) comprising: said base fabric (2) is folded back to form said loops (6) with ground wefts (8) to join said ground wefts (8) on the papermaking side A ground warp (9) including an upper stage (10) woven into the ground weft (10) and a middle stage (11) woven into the ground weft (8, 8b) on the running surface side, and the ground weft (8 , 8b) with additional warp yarns (12) including lower tiers woven into the ground weft yarns (8, 8b) such that, in a complete weave, each said additional warp yarn (12) passes on the papermaking side with respect to said ground weft yarns (8, 8b). The number of times and number of weaves is half or less so that each of the middle tiers (11) passes through the papermaking surface side of the ground wefts (8, 8b), and the additional warp (12) is , thicker than the ground warp yarns (9).

According to this configuration, most of the additional warp yarns are arranged on the running surface side rather than the middle step portion, and the yarns that wear over time due to contact with the paper machine or the like become thick additional warp yarns, and the middle step portion and the loop run. Since abrasion on the face side is suppressed, it is possible to provide a papermaking seam felt with improved durability.

In the papermaking seam felt (1) according to an embodiment of the present invention, the ground wefts (8) and the ground wefts (8) and the It is characterized in that the ground warps (9) form a double weave structure.

According to this structure, the density of the ground wefts and the ground warps is higher than that of the single weave, so the elongation is small, the dimensional stability is high, and the rigidity is improved. Further, since the ground wefts connect the upper step portion and the middle step portion, it is possible to prevent the upper step portion and the middle step portion from mutually shifting in the length direction during needling.

In the papermaking seam felt (1) according to an embodiment of the present invention, in the first configuration, the ground weft (8) is woven into the upper step portion (10), and the upper ground weft (8a) It is characterized by forming a laminate structure in which two single weave structures overlap each other by including the base weft (8b) woven into the middle section (11).

According to this configuration, since the number of ground wefts increases, the amount of voids in the felt increases.

In the papermaking seam felt (1) according to an embodiment of the present invention, in any one of the above configurations, the thickness of the additional warp (12) is 1.02 times or more the thickness of the ground warp (9). It is characterized by being 1.5 times or less.

The thickness of the additional warp is 1.02 times or more the thickness of the base warp, which improves the durability. A decrease in water squeezability is suppressed by securing a gap in the base fabric.

In the papermaking seam felt (1) according to an embodiment of the present invention, in the above configuration, the ground warp (9) is composed of a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less, and the additional warp (12) is composed of a twisted yarn obtained by twisting 30 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less, or a multifilament twisted yarn consisting of three ply twists. characterized by

According to this configuration, the excessive flattening of the additional warp is suppressed, so that the reduction of the void amount is suppressed. Furthermore, it becomes easy to adjust the thickness of the additional warp to 1.02 to 1.5 times the thickness of the ground warp while exhibiting these effects.

In the papermaking seam felt (1) according to an embodiment of the present invention, in any one of the above configurations, the ground warp yarns (9) constituting the upper stage portion (10), the middle stage portion (11) ) and the additional warps (12) forming the lower portion (12) are equal to each other.

According to this configuration, the number of warps in the lower part formed by the additional warps is equal to the number of ground warps in the upper part and the middle part, so that the amount of voids can be increased.

According to the present invention, it is possible to provide a papermaking seam felt with improved durability by suppressing abrasion of the loops.

Schematic cross-sectional view in the warp direction of the seam portion of the papermaking seam felt according to the embodiment Schematic cross-sectional views in the weft direction of the base fabric according to the embodiment and its modification (A: embodiment, B: modification) Explanatory drawing which shows the manufacturing method of the base fabric which concerns on embodiment Schematic cross-sectional view of the seam portion of the base fabric according to the prior art

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section in the warp direction (a cross section perpendicular to the weft direction) of a seam portion of a papermaking seam felt (hereinafter simply referred to as "felt") 1 according to the embodiment. The felt 1 includes a base fabric 2 and a batt layer 3 formed by laminating short fibers on the paper-making side and the running side of the base fabric 2 and integrating them by needling. The felt 1 is endless in the longitudinal direction (machine direction, warp direction) and is attached to a paper machine. Further, in the following description, the thickness direction of the felt 1 and the base fabric 2 is defined as the vertical direction, the papermaking surface side is referred to as "upper", and the running surface side is referred to as "lower".

FIG. 2(A) shows a cross section in the weft direction (a cross section perpendicular to the warp direction) of the base fabric 2 according to the embodiment. As shown in FIGS. 1 and 2A, the base fabric 2 has loops 6 at both ends in the lengthwise direction. After the felt 1 is pulled into the felt run, the loops 6 at both ends of the base cloth 2 are alternately arranged so as to be aligned with each other, and the core wire 7 is passed through the loops 6 to connect the both ends to the felt. 1 becomes endless.

The base fabric 2 includes ground wefts 8 extending in the width direction (perpendicular to the machine, weft direction) of the felt 1 and ground warps 9 woven into the ground wefts 8 and extending in the length direction of the felt 1 . The ground warps 9 include an upper step portion 10 woven into the ground wefts 8 on the papermaking surface side and a middle step portion 11 woven into the ground wefts 8 on the running surface side. A boundary portion between the upper step portion 10 and the middle step portion 11 of the ground warp yarn 9 is folded back to form a loop 6 .

The ground wefts 8 and the ground warps 9 form a double weave structure by alternately weaving the ground wefts 8 into the upper stage portion 10 and the middle stage portion 11 . Here, the alternate weaving of the ground wefts 8 into the upper stage portion 10 and the middle stage portion 11 means that the ground wefts 8 pass over one or a plurality of continuous upper stage portions 10 once or multiple times. , and passing under one or a plurality of continuous intermediate step portions 11 once or multiple times alternately.

FIG. 2(B) shows a cross section in the weft direction (a cross section orthogonal to the warp direction) of the base fabric 2 according to the modification. In addition, the longitudinal cross section of the modified example is the same as that in FIG. 1 except for the reference numerals (in FIG. common reference numerals for the embodiment and variations). In the modification shown in FIG. 2(B), the ground wefts 8 include the upper ground weft 8a woven into the upper tier 10 and the base weft 8b woven into the middle tier 11, so that two single weave structures overlap each other. A laminated structure is formed. In the figure, the structure formed by the ground wefts 8 and the ground warps 9 is a laminated structure, the upper ground wefts 8a and the upper part 10 are woven in plain weave, and the base wefts 8b and the middle part 11 are plainly woven in each other. Although the case of being woven is shown, it may be woven with a structure other than plain weave.

As shown in FIGS. 1 and 2, the base fabric 2 has a ground weft 8 (when the layer composed of the ground weft 8 and the ground warp 9 is a double weave structure) or a ground weft 8b (ground weft) on the running surface side. 8 and ground warp yarns 9 in the case of a laminate-like structure). The additional warp yarns 12 do not form connecting loops 6 and are cut at the seams.

A complete weave is the minimum unit of a weave that is the basis of a woven fabric, and the woven fabric is woven by repeating the complete weave in the length and width directions. In the complete weave, the number of times the ground wefts 8 are woven so that the additional warp 12 passes over the ground wefts 8 and the number of the ground wefts 8 to be woven is determined so that the middle tier 11 passes over the ground wefts 8. The number of times of weaving and the number of ground wefts 8 to be woven are less than half. Therefore, in the thickness direction of the base fabric 2, the additional warp yarns 12 are located more on the running surface side than the intermediate step portion 11, and constitute the lower step portion of the warp yarns. Here, the middle section 11 and the additional warp 12 may pass over a plurality of continuous ground wefts 8 in a section passing over the ground wefts 8 .

The complete weave of the base fabric 2 according to the embodiment includes an upper stage portion 10 made up of eight ground wefts 8, eight ground warps 9, a middle stage portion 11 made up of eight ground warps 9, and eight additional and the warp yarns 12 . The ground wefts 8 are arranged between a pair of upper tiers 10 and a middle tier 11, above one upper tier 10, between a pair of upper tiers 10 and a middle tier 11, below additional warps 12, and one pair of upper tiers. The warps are arranged so as to pass in order between the warp 10 and the middle tier 11, above one upper tier 10, between one set of the upper tier 10 and the middle tier 11, and between one set of the middle tier 11 and the additional warp 12. be. Therefore, in the present embodiment, in the complete weave, the middle section 11 passes over one ground weft 8 twice, while the additional warp 12 passes over one ground weft 8 once. ing. Further, in the portion where the additional warp 12 of the ground weft 8 passes over, the middle step portion 11 also passes over it. Thus, the number of times the additional warp 12 weaves the ground weft 8 is less than half the number of times the middle tier 11 weaves the ground weft 8, and the number of ground wefts 8 woven into the additional warp 12 is It is less than half the number of ground wefts 8 that are woven. Although the configuration of the complete weave is not limited to the configuration described above, it is preferable that the numbers of the upper tier portion 10, the middle tier portion 11 and the additional warp yarns 12 (lower tier portion) in the complete weave are equal to each other.

The complete weave of the base fabric 2 according to the modified example is composed of the upper part 10 composed of four top wefts 8a, four ground wefts 8b, four ground warps 9, and four ground warps 9. It is composed of a middle section 11 and four additional warp threads 12 . Upper ground wefts 8a are woven into the upper tier 10 in a plain weave, and base wefts 8b are woven between the upper tier 10 and the middle tier 11, under one additional warp 12, and with the upper tier 10. It is arranged so as to pass between the middle step portion 11 and between a pair of the middle step portion 11 and the additional warp yarns 12 in order.

As materials for the core wire 7, the ground wefts 8, the ground warps 9, and the additional warps 12, for example, synthetic resins such as nylon, polyamide, polyester, polyethylene, polypropylene, and polyvinyl chloride can be used. The core wire 7 is preferably 5 to 10 twisted threads of these materials. The ground weft 8 is preferably a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less, and about 11 or more and about 24 or less per cm (30 or more and 60 or less per inch) in the length direction. placed. The ground warp yarns 9 are preferably monofilaments having a thickness of 0.3 mm or more and 0.55 mm or less, and about 15 or more and about 24 or less per cm (40 or more and 60 or less per inch) in the width direction. placed.

The additional warp yarns 12 forming the lower step portion are thicker than the ground warp yarns 9 including the upper step portion 10 and the middle step portion 11 . Preferably, the thickness of the additional warp yarns 12 is 1.02 to 1.5 times the thickness of the ground warp yarns 9 . The additional warp 12 is preferably a twisted yarn, more preferably 30 or less and 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less (the number of monofilaments is large if the diameter of the monofilament is small, and the yarn The larger the diameter, the smaller the number of twisted yarns) or the multifilament twisted yarn consisting of three ply twists. For example, the additional warp yarn 12 is a 3/10/8 yarn (8 monofilaments are twisted into 10 yarns, and the 10 under-twisted yarns are further twisted into 3 yarns (twisted in the opposite direction and ply twisted). plied yarn), 3/8/10 yarn, or 3/6/12 yarn. Further, for example, the additional warp 12 is a 3/20 yarn (one-twisted yarn obtained by twisting three 20 monofilaments (a yarn obtained by collecting three untwisted monofilaments and twisting them in one direction). ). Further, for example, the additional warp 12 is a plied yarn obtained by ply-twisting three multifilament yarns obtained by ply-twisting several to several tens of them.

FIG. 3 shows a method of manufacturing the base fabric 2 . The base fabric 2 is woven by tubular weaving. That is, the base fabric 2 is woven using the ground wefts 8 as regular warp yarns and the ground warp yarns 9 and the additional warp yarns 12 as driving yarns. A selvage yarn 13 (core wire for weaving) is arranged in parallel with the ground weft yarn 8 which is the warp yarn. The ground warp yarns 9 are woven into the ground weft yarns 8 by turning back the shuttle (not shown) attached to the ground warp yarns 9 with the selvage yarns 13 . The additional warp yarns 12 are woven into the ground weft yarns 8 by winding a shuttle (not shown) attached to the additional warp yarns 12 around the outside of the ground warp yarns 9 . A felt 1 (see FIG. 1) is manufactured by integrating a batt layer 3 (see FIG. 1) made of short fibers laminated on a base fabric 2 by needling. Additional warp yarns 12 are cut at the seam before or after needling. The felt 1 is used by reversing the front and back of the base fabric 2 when it is manufactured.

The effects of the base fabric 2 according to the embodiment and modifications shown in FIGS. 1 and 2 will be described in comparison with the base fabrics 100a, b, c, d, e, and f according to the prior art shown in FIG. .

Since the base fabric 2 includes not only the ground wefts 8 and the ground warps 9 but also the additional warps 12, the amount of voids in the felt 1 is increased compared to the case where the additional warps 12 are not provided, and the water extraction is improved.

In the base fabric 2, the frequency and number of weaving so that the additional warps 12 pass above the ground wefts 8 and the number and number of weaving so that the middle tier 11 passes above the ground wefts 8 are less than half. Therefore, most of the additional warp yarns 12 are located below the middle step portion 11 . Therefore, the additional warp yarns 12 are mainly the yarns that wear out over time due to contact with the paper machine. Since the additional warp yarns 12 to be worn out are thicker than the ground warp yarns 9, the durability of the base fabric 2 is improved. In the base fabrics 100a, b, c, d, e, and f according to the conventional technology shown in FIG. In the base fabric 2 according to the modified example, wear of the lower side of the loops 6 is prevented by the additional warp yarns 12, so durability is greatly improved. In particular, when the thickness of the additional warp yarns 12 is 1.02 times or more the thickness of the ground warp yarns 9, the durability is improved, and the thickness of the additional warp yarns 12 is 1.5 times or less than the thickness of the ground warp yarns 9. In the case of , the gaps between the additional warp yarns 12 are ensured, so the durability can be improved without greatly reducing the water squeezing capacity.

In addition, in the base fabrics 100e and f according to the prior art shown in FIG. The use of a welding batt greatly hinders water extraction, and since the weft 108e or warp 107f is in a free state, the entanglement is poor and the abrasion suppressing effect is reduced. On the other hand, since the base fabric 2 according to the embodiment does not require the use of a welding batt, the water extraction is not hindered.

In addition, since the portion of the additional warps 12 forming the lower portion passing under the ground wefts 8 is longer than the portion passing under the ground wefts 8 in the middle step portion 11, the additional warp 12 is less than the case where there is no additional warp 12. vibration is suppressed.

In the conventional base fabrics 100a, b, c, d, e, and f, the warp yarns 107 and/or weft yarns 108 arranged on the papermaking surface side are made thinner than the warp yarns 103 and weft yarns 104 arranged on the running surface side. By doing so, the paper surface property was improved. However, the paper produced was marked at the seam. This is because the gap at the cut edge of the warp yarn 107 cut at the seam portion becomes a mark. In the base fabric 2 according to the embodiment and the modification, even if another layer is added to the paper-making surface side of the layer composed of the ground weft 8 and the ground warp 9, the paper surface property of the seam portion cannot be sufficiently improved. 12 is provided on the running surface side of the layer composed of ground weft 8 and ground warp 9 to improve durability.

If the second base fabric layers 102a, b, c include both the warp yarns 107a, b, c and the weft yarns 108a, b, c like the base fabrics 100a, b, c according to the prior art, the basis weight (per unit area weight) increases. In addition, since the base fabrics 100e and 100f according to the prior art use a welding batt, the basis weight is increased. As a commercial practice, the product price of the felt 1 is set based on the weight per unit area, so consumers desire the weight per unit area of the felt 1 to be small. It is necessary to reduce the amount of batt used in order to suppress an increase in basis weight in the felt provided with the base fabrics 100a, b, c, e, and f. On the other hand, in the base fabric 2 according to the embodiment and the modification, only the additional warp 12 increases the weight with respect to the layer composed of the ground weft 8 and the ground warp 9, so an increase in basis weight is suppressed. be done.

In the base fabrics 100a, c, e, and f according to the prior art, since the second base fabric layers 102a, c, e, and f are not bonded to the first base fabric layer 101, the first base fabric The layer 101 and the second backing layer 102a,c,e,f are vertically offset from each other. In the base fabric 2 according to the embodiment, the additional warp yarns 12 are woven into the ground weft yarns 8 . Therefore, it is possible to prevent the layer composed of the ground wefts 8 and the ground warps 9 and the additional warps 12 from being displaced in the height direction from each other during needling. In addition, in the base fabric 100e according to the prior art, the weft 108e is easily frayed at the seam portion, and in the base fabric 100f, the warp 107f is easily pulled out. Since it is used, these problems are less likely to occur.

Since the additional warp yarns 12 are composed of twisted yarns, the batt layer 3 is well entwined with the base fabric 2 .

When monofilaments having a thickness of 0.3 mm or more and 0.55 mm or less are used as the ground warp yarns 9, 30 or less and 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less are used as the additional warp yarns 12. When using a twisted yarn twisted with 2 or a multifilament twisted yarn consisting of three ply twists, the thickness of the additional warp 12 is adjusted to 1.02 to 1.5 times the thickness of the ground warp 9. It's easy to do. In addition, by using such twisted yarns as the additional warp yarns 12, it is possible to suppress excessive flattening of the additional warp yarns 12 and a decrease in the void amount.

When a layer composed of the ground wefts 8 and the ground warps 9 is made into a double weave structure like the base fabric 2 according to the embodiment, the density of the ground wefts 8 and the ground warps 9 is higher than that of the single weave. It has little elongation, high dimensional stability, and improved rigidity, and since the ground weft 8 connects the upper tier 10 and the middle tier 11, it prevents the upper tier 10 and the middle tier 11 from shifting in the length direction during needling. can be suppressed. Further, if the layer composed of the ground wefts 8 and the ground warps 9 is made into a laminated structure of two single weaves as in the base fabric 2 according to the modified example, the number of the ground wefts 8 increases, so that the amount of voids increases. .

In the complete weave, the number of additional warp yarns 12 forming the lower step portion is equal to the number of the upper step portion 10 and the middle step portion 11, so the amount of voids increases.

Although the specific embodiments have been described above, the present invention is not limited to the above embodiments and can be widely modified. For example, felt 1 may be used in other papermaking machines, such as pulp machines, rather than paper machines.

1: Seam felt for papermaking 2: Base fabric 6: Loop 7: Core wire 8: Ground weft 8a: Upper ground weft 8b: Ground weft 9: Ground warp 10: Upper part 11: Middle part 12: Additional warp

Claims (6)

A papermaking seam felt comprising a base fabric having loops formed at both ends to be connected to each other and a batt layer integrated with the base fabric,
The base fabric is
ground wefts;
a ground warp that is folded back to form the loop and includes an upper stage portion woven into the ground weft on the papermaking surface side and a middle stage portion woven into the ground weft on the running surface side;
An additional warp including a lower part woven into the ground weft on the running surface side,
In the complete weave, the number and number of times each additional warp is woven so that it passes through the ground weft on the papermaking side is the number of times each of the middle tier parts is woven so that it passes through the ground weft on the papermaking side. and less than half the number of
The seam felt for papermaking, wherein the additional warp yarns are thicker than the ground warp yarns. 2. The papermaking method according to claim 1, wherein the ground wefts and the ground warps form a double weave structure by alternately weaving the ground wefts into the upper stage portion and the middle stage portion. for seam felt. The ground weft includes a top weft woven into the upper portion and a ground weft woven into the middle portion, thereby forming a laminated structure in which two single weave structures overlap each other. A papermaking seam felt according to claim 1. The papermaking seam felt according to any one of claims 1 to 3, wherein the thickness of the additional warp is 1.02 to 1.5 times the thickness of the base warp. The ground warp is composed of a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less,
The additional warp is composed of a twisted yarn obtained by twisting 30 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less, or a multifilament twisted yarn composed of three ply twists. The seam felt for papermaking according to claim 4, characterized in that: Claims 1 to 5, characterized in that in the complete weave, the ground warps constituting the upper stage portion, the ground warps constituting the middle stage portion, and the additional warps constituting the lower stage portion are equal in number. The seam felt for papermaking according to any one of .

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