JP6591299B2 - Felt base fabric for papermaking - Google Patents

Description

  The present disclosure relates to a papermaking felt base fabric.

  The papermaking felt includes a base fabric in which warp and weft are woven together, and a bat fiber layer formed by needling a short fiber sheet on the base fabric. Papermaking felts are press parts that mechanically squeeze moisture from wet paper and are used for transporting and watering wet paper. Felt for papermaking includes wet paper transportability, water squeezing, paper surface without marking on the paper surface, initial familiarity with respect to the time from when it is installed on the paper machine to the best condition, antifouling, and Durability is required. Furthermore, in a seam felt, that is, a felt in which loops formed at both ends are hooked on each other, and both ends are joined to each other through a core wire in the looped loop, good loop insertion is required. . The performance required for such a papermaking felt is affected by the structure of the base fabric.

  For example, thinning the base fabric improves water squeezing and initial conformability, but with a single layer of warp and weft each having a single layer or a thin layer of 1.5 layer weaving In some cases, sufficient durability could not be obtained. Further, in order to improve the loop insertion property, it is preferable to make the loop upright and to direct the loop hole in the weft direction. For this purpose, the warp is divided into two layers, and the loop is formed by folding back at the upper and lower warp connecting portions. Is formed. However, in this structure, since the warp yarns overlap each other, the base fabric becomes thick. In order to solve such a problem, Patent Document 1 proposes a seam felt that has a single-weave base and a seam part of two layers, which achieves both thinness and good loopability. Yes.

JP 2008-19521 A

  However, since the seam felt provided with the base fabric described in Patent Document 1 has a single weave, the number of warps forming a loop is about half that of a double weave. When the strength was low and a high strength was required, it could not be used. In view of the above problems, an object of the present invention is to provide a papermaking felt base fabric having both thinness and strength.

  The felt base fabric for papermaking (10, 30, 40) according to at least some embodiments of the present invention is a ground portion in which upper and lower two layers of warps (16) and one layer of weft (17) are woven together ( 14 and 31), and the warp is composed of an upper warp (18) disposed in an upper layer and a lower warp (19) disposed in a lower layer, and the weft is formed by a predetermined repeating unit. A first weft (20) woven into the warp and the lower warp, and a second weft (21) woven into the upper warp and the lower warp in the predetermined repeating unit in a different weaving method from the first weft. Each of the first weft and the second weft is woven in the repeat unit only once from the upper warp and only once from the lower one in the repeat unit. Weaving, in the ground part The upper warp and the lower warp are arranged so as not to overlap each other in the weft direction, and the first and second wefts cooperate with each other so that the upper warp and the lower warp are displaced. In order to maintain the arrangement, when viewed from the warp direction, the upper and lower warps are woven into the upper warp and the lower warp in a manner of weaving that matches the other when one side is reversed left and right. .

  According to this configuration, in the ground portion, the upper warp and the lower warp are arranged so as not to overlap each other in the weft direction, so that the thickness of the ground portion is thinner than when they overlap each other. Therefore, the papermaking felt using this base fabric is excellent in water squeezing and initial adaptability. Moreover, since the warp has two layers, the strength in the warp direction is increased.

  The felt base fabric for papermaking according to at least some embodiments of the present invention further includes a pair of seam portions (15) extending from both ends in the warp direction of the ground portion in the above configuration, Each of the pair of seam portions includes a loop (13) formed by folding back the warp yarn, and a woven end portion (22) arranged between the loop and the ground portion so that the warp yarn and the weft yarn are woven together. The upper warp and the lower warp forming the loop are arranged so as to overlap each other, and at the woven end portion, the weft is above and below the upper warp and the lower warp in the loop. In order to maintain the overlapping arrangement, one of the first weft and the second weft is configured.

  According to this structure, since the loop stands upright along the up-down direction and the warp direction, it is excellent in laying property.

  The felt base fabric for papermaking according to at least some embodiments of the present invention is characterized in that, in the above configuration, the weft constituting the seam portion has a smaller diameter than the weft constituting the ground portion. .

  According to this configuration, it is possible to suppress the difference in the thickness between the ground portion and the seam portion, which is caused by the upper warp and the lower warp being displaced from each other in the ground portion and overlapping each other in the loop. it can. Therefore, the vibration when the felt to which the felt base fabric for papermaking is applied passes through the press machine of the papermaking machine can be reduced.

  In the felt base fabric for papermaking according to at least some embodiments of the present invention, in the above configuration, the base portion includes four upper warps, four lower warps, four first wefts, and four The second weft comprises a complete structure, and the first weft consists of eight warps arranged in order on the lower warp, below the upper warp, below the lower warp, and above the upper warp Under the upper warp, under the upper warp, over the lower warp and over the upper warp and woven into the warp, and the four first wefts interweave the warp with each other In order to shift the position in the weft direction, with respect to any one of the first wefts, the remaining three first wefts are equivalent to two, four and six warps respectively. Disposed in the weft direction, the second weft consists of eight warps arranged in order on the lower warp. Under the upper warp, over the lower warp, over the upper warp, over the lower warp, under the upper warp, under the lower warp and under the upper warp, and woven into the warp, The four second wefts are the remaining three second wefts with respect to any one of the second wefts so that the positions where the warps are woven with each other are shifted in the weft direction. The warp yarns are arranged so as to be shifted in the weft direction by two yarns, four yarns, and six yarns.

  According to this configuration, a texture with less unevenness is formed on the upper surface side, and thus the paper surface property is excellent.

  The felt base fabric for papermaking (10) according to at least some embodiments of the present invention has the above-described configuration, wherein the first to fourth wefts constitute the first weft, the wefts arranged in order in the complete structure. The fifth to eighth wefts constitute the second weft. Further, in the felt base fabric for papermaking (30) according to another embodiment of the present invention, the first, third, sixth and eighth wefts arranged in order in the complete structure are the first, third, sixth and eighth wefts. One weft is constituted, and the second, fourth, fifth and seventh wefts constitute the second weft.

  According to these structures, the 1st weft and the 2nd weft are arrange | positioned with sufficient balance, and the arrangement | positioning which shifted | deviated to the weft direction of the upper warp and the lower warp is stabilized.

  According to the present invention, it is possible to provide a felt base fabric for papermaking having a thin ground portion and high strength.

Schematic cross-sectional view showing the conventional way of weaving Schematic sectional view showing the state of changing the conventional weaving method Typical sectional drawing which shows how to weave one Embodiment of this invention The perspective view of a seam felt provided with the foundation cloth concerning a 1st embodiment. The pattern figure of the ground part of the base fabric which concerns on 1st Embodiment The typical sectional view showing how to weave the weft of the base fabric concerning a 1st embodiment Pattern of base fabric according to the second embodiment Schematic sectional view of the base fabric according to the third embodiment Photograph of base fabric of example according to first embodiment (upper surface of ground part) A photograph of a base fabric of an example according to the first embodiment (a cross section obtained by cutting a warp of a ground part) Photograph of base fabric of example according to first embodiment (upper surface near boundary between ground and seam)

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

  1 to 3 are schematic cross-sectional views for explaining an outline of a weaving method of the present invention by comparing a conventional example with one embodiment of the present invention. FIGS. 1 to 3 show (a) the shape of the wefts 3 and 4 according to the weaving method (the order in which the warps 1 and 2 are driven), and (c) the shape of the wefts 3 and 4 in the woven state. Indicates.

  FIG. 1 shows a state in which wefts 3 in a stable state are woven into an upper warp 1 and a lower warp 2 that are arranged so as to overlap each other. Here, the “stable state” means that when a predetermined range is seen in a cross section, the weft 3 passes along the upper warp 1 or under the lower warp 2 in the vertical direction passing through that point. This means that it is symmetrical with respect to the line. Specifically, as shown in the left diagram of FIG. 1 (a), the weft 3 in a stable state is between the upper warp 1 and the lower warp 2, above the upper warp 1, and between the upper warp 1 and the lower warp 2. In the meantime, it is woven in a repeating pattern of passing under the lower warp 2. The right view of FIG. 1A shows the weft 3 in which the repeating pattern is shifted by two pieces of the upper warp 1 and the lower warp 2 with respect to the weft 3 of the left view. Since the weft 3 tends to be woven into the upper warp 1 and the lower warp 2 at the shortest, a force directed in the vertical direction indicated by the arrow in FIG. 1A is applied from the weft 3 to the upper warp 1 and the lower warp 2. Therefore, the positions of the upper warp 1 and the lower warp 2 are moved to the positions shown in FIG. Therefore, when the two wefts 3 whose repeated pattern positions are shifted from each other are woven, the upper warp 1 and the lower warp 2 are maintained in a state where they overlap each other as shown in FIG.

  FIG. 2 shows a state in which wefts 4 in an unstable state are woven into the upper warp 1 and the lower warp 2 that are arranged so as to overlap each other. Here, the “unstable state” means that the weft 4 does not form a bilaterally symmetric shape with respect to the vertical axis when the predetermined range is viewed in cross section. Specifically, as shown in the left diagram of FIG. 2 (a), the weft 4 in an unstable state is between the upper warp 1 and the lower warp 2, above the upper warp 1, below the lower warp 2, It is woven in a repeating pattern of passing between the upper warp 1 and the lower warp 2. The right view of FIG. 2A shows the weft 4 in which the repeating pattern is shifted by two pieces of the upper warp 1 and the lower warp 2 with respect to the weft 4 of the left view. Also in this case, since the weft 4 tries to be woven into the upper warp 1 and the lower warp 2 in the shortest time, the force including the component force in the left-right direction (weft direction) indicated by the arrow in FIG. To upper warp 1 and lower warp 2. Due to this force, the upper warp 1 and the lower warp 2 move in the left-right direction so as not to overlap each other as shown in FIG. However, when the two weft yarns 4 whose positions of the repeated patterns are shifted from each other are woven, as shown in FIG. The upper warp No. 1 ′ and the upper warp No. 1 ′ of the 2 ′ upper warp No. 1 ′ and the upper warp No. 1 ″ of the upper warp No. 1 ″, respectively, are shifted one by one from the state. And 2 ″, the upper warp No. 1 ′ and 2 ′ of the upper warp No. 1 ′ and the upper warp 1 of FIG. And the top and bottom.) Accordingly, the weaving method shown in FIG. 2 is substantially the same as the weaving method shown in FIG. 1 in the middle portion, although only the upper warp 1 or the lower warp 2 is in the end portion in the weft direction. .

  FIG. 3 shows a case in which a weft 3 in a stable state and a weft 4 in an unstable state are woven into an upper warp 1 and a lower warp 2 arranged so as to overlap each other. The left figure of Fig.3 (a) shows the weft 3 of the stable state, and the right figure of Fig.3 (a) shows how the weft 4 of the unstable state is woven into the upper warp 1 and the lower warp 2. When both are combined as shown in FIG. 3B, the upper warp 1 and the lower warp 2 are moved so that the wefts 3 and 4 are shortest. However, since both of the wefts 3 and 4 try to be the shortest, both do not become the state of FIG. 1C or FIG. 2C, but the state shown in FIG. become. In FIG.3 (c), the upper warp 1 and the lower warp 2 are maintained in the position which does not mutually overlap up and down, Therefore, the up-down direction distance between the upper warp 1 and the lower warp 2 becomes short. As shown in FIG. 3 (c), when the upper warp 1 does not overlap the lower warp 2 in the vertical direction but is positioned in the middle of the two lower warps 2 adjacent to each other in the left-right direction, the weft in a stable state 3 and the weft 4 in an unstable state are woven into the upper warp 1 and the lower warp 2 in a weaving manner that matches one when the left and right are reversed when viewed from the warp direction. Although not shown in the figure, when there are further wefts 3 and 4 at a position shifted in the weft direction by one upper warp 1 or lower warp 2 so that the weaving shapes do not overlap when viewed from the warp direction, Furthermore, the balanced state is stabilized. The number of the upper warp 1 and the lower warp 2 and the specific weaving method are not limited to the form shown in FIG. 3, but as described above, in the cross section viewed from the warp direction, do not overlap each other. When the upper warp 1 and the lower warp 2 are reversed in the left-right direction, two types of wefts 3 and 4 that match the other are woven together, so that the upper warp 1 and the lower warp 2 overlap each other vertically. The basic idea of the present invention is to maintain the disposition.

  FIG. 4 shows a seam felt 12 including a base fabric 10 according to the first embodiment of the present invention and a bat fiber layer 11 formed by needling a short fiber sheet on the base fabric 10. Loops 13 are formed at both ends in the warp direction (length direction) of the base fabric 10, and the loops 13 are exposed from the bat fiber layer 11. When the seam felt 12 is attached to the paper machine, the loops 13 at both ends are hooked with each other, and a core wire (not shown) is passed through the looped loops 13 so that both ends are joined to each other. Used as a belt.

  The base fabric 10 includes a ground portion 14 and seam portions 15 having loops 13 disposed at both ends in the warp direction of the ground portion 14 (see FIGS. 4 and 11).

  As shown in FIG. 5 and FIG. 6, the ground portion 14 extends in the warp direction and is arranged in two layers on the upper and lower sides, and the warp 16 extends in the weft direction perpendicular to the warp direction and is arranged in one layer. The wefts 17 are woven together. Monofilament single yarn or twisted yarn is preferably used as the warp yarn 16, and monofilament single yarn or twisted yarn can be used as the weft yarn 17. The warps 16 and the wefts 17 are made of synthetic resin such as nylon, polyamide, polyester, polyethylene, polypropylene, polyvinyl chloride or the like.

  The warp 16 forms an upper layer and is disposed on the papermaking surface side of the seam felt 12 (warp Nos. 2 ″, 4 ″, 6 ″, 8 ″ in FIGS. 5 and 6), A lower warp 19 (warp Nos. 1 ″, 3 ″, 5 ″, 7 ″ in FIGS. 5 and 6) is formed on the running surface side of the seam felt 12 to form a lower layer. The upper warp 18 and the lower warp 19 are the same number in the complete structure, and are four each in the first embodiment. In the ground portion 14, the upper warp 18 and the lower warp 19 are arranged at positions shifted in the weft direction without overlapping each other.

  The weft 17 in the base 14 is a first weft 20 woven into the upper warp 18 and the lower warp 19 and a second weft woven into the upper warp 18 and the lower warp 19 in a different weaving method from the first weft 20. 21. As shown in FIG. 5, the first weft 20 and the second weft 21 are the same number in the complete structure, and there are four each in the first embodiment. Conceptually, one of the first weft 20 and the second weft 21 corresponds to the weft 3 in a stable state in FIG. 3, and the other corresponds to the weft 4 in an unstable state in FIG. As shown in FIG. The 1 'to 4' first wefts 20 are woven in the same way, but are shifted by two warps 16 in the weft direction so that the weaving shapes do not overlap when viewed from the warp direction. Yes. Similarly, weft No. The second wefts 5 'to 8' are woven in the same manner, but are shifted by two warps 16 in the weft direction so that the weaving shapes do not overlap when viewed from the warp direction. Yes. Looking at how the first and second wefts 20 and 21 are woven into the upper and lower warps 18 and 19 in a state where the upper and lower warps 18 and 19 do not overlap vertically but are shifted in the weft direction (left and right direction), FIG. As shown in FIG. 6, when viewed from the longitudinal direction, when one of the vertical lines passing through predetermined points intersecting each other is turned into an axis, and one of the lines is reversed left and right, it coincides with the other. For example, as shown in FIG. 1 'first weft 20 and weft no. The second weft 21 of 8 ′ is a warp No. 5 ″ lower warp 19 intersects with the intersecting point and warp no. When one side is reversed left and right with the vertical line passing through the 5 ″ lower warp 19 as an axis, the way of weaving into the upper warp 18 and lower warp 19 is the same as the way of weaving into the other upper warp 18 and lower warp 19 Match. That is, weft No. 1 'first weft 20 is warp no. As we move from the lower warp 19 to the left, the weft no. The second weft 21 of 8 ′ is warp No. As it goes to the right from the lower warp 19 of 5 ″, under the upper warp 18 (warp No. 4 ″ or 6 ″), under the lower warp 19 (warp No. 3 ″ or 7 ″), Below the upper warp 18 (warp No. 2 ″ or 8 ″), above the lower warp 19 (warp No. 1 ″), above the upper warp 18 (warp No. 8 ″ or 2 ″) Go through in order. Also, weft No. The method of weaving the second wefts 21 of 6 'to 8' is that wefts No. 6 that are reversed left and right by a predetermined axis shifted in the weft direction from the above-mentioned axis. This matches the weaving method of the 1 ′ first weft 20. Weft No. Each of the first weft 20 of 2 ′ to 4 ′ and the weft No. The same applies to the relationship with the second weft 21 of 5 ′ to 8 ′. Therefore, the arbitrary first weft 20 and the optional second weft 21 coincide with the other weaving method when viewed from the warp direction when one weaving method is reversed left and right. Each of the first weft 20 and the second weft 21 is woven into the upper warp 18 and the lower warp 19 in a predetermined repeating unit. In the repeating unit, one of the upper warps 18 is once taken from above. Only one weaving of the lower warp 19 is woven from below. Further, when the arbitrary wefts 17 in the repeating unit are viewed, the warp yarns 16 disposed above the weft yarns 17 and the warp yarns 16 disposed below are equal in number.

  Note that the first weft 20 and the second weft 21 have different weaving methods and, when reversed left and right, match the other weaving method. Therefore, when the upper warp 18 and the lower warp 19 do not overlap each other, Is not symmetrical. For example, as shown in FIG. The first weft 20 of 4 ′ is warp No. After passing under the lower warp 19 of 5 ″, the warp No. Two warps 16 (warp No. 4 ″, 3 ″) are passed to the left until passing through the upper warp 2 ′ of 2 ′, while four warps 16 (warp No. 4) are passed to the right. 6 ″, 7 ″, 8 ″, 1 ″). 5 is not symmetric with respect to the vertical axis passing through the lower warp 19. The same applies if the axis is changed.

  The seam portion 15 has a loop 13 (see FIG. 4) and a woven end portion 22 (see FIG. 11) disposed between the ground portion 14 and the loop 13.

  The woven end portion 22 is formed by weaving the warp 16 and the weft 17, and the upper warp 18 and the lower warp 19 arranged in a shifted state in the base portion 14 overlap each other in the loop 13. It is a part for migrating to be arranged. The warp 16 in the woven end portion 22 has an upper warp 18 and a lower warp 19. The weft 17 in the woven end portion 22 has only one of the first weft 20 and the second weft 21. Therefore, the upper warp 18 and the lower warp 19 are moved up and down as shown in FIG. 1C or FIG. It shifts to the overlapping state and is maintained in that state. In the region on the side of the loop 13 where the upper warp 18 and the lower warp 19 in the woven end portion 22 are arranged so as to overlap each other, the weft 17 is woven into the upper warp 18 and the lower warp 19 in a substantially symmetrical manner. . In this embodiment, the number of the wefts 17 in the woven end portion 22 is such that the upper warp 18 and the lower warp 19 can be shifted to a state where they overlap each other. The number is 8 which is the same as the number. Further, in the woven end portion 22, a weft 17 having a diameter smaller than that of the weft 17 of the ground portion 14 may be used. In that case, an increase in the thickness of the woven end portion 22 caused by the upper warp 18 and the lower warp 19 being arranged so as to overlap each other can be suppressed or prevented.

  The loop 13 is formed by folding back the warp 16. Since the upper warp 18 and the lower warp 19 are arranged so as to overlap each other on the loop 13 side of the woven end portion 22, the upper warp 18 and the lower warp 19 in the loop 13 are also arranged so as to overlap each other. That is, the loop 13 stands upright without being inclined with respect to the vertical direction and the warp direction.

  The effect of the base fabric 10 is demonstrated. In the ground portion 14, each of the first weft 20 and each of the second weft 21 cooperates and is disposed at a position shifted in the weft direction so that the upper warp 18 and the lower warp 19 do not overlap each other. Is done. Therefore, assuming a space between the upper warp 18 and the lower warp 19 when they are arranged one above the other, since the warp 16 and the weft 17 enter the space, the upper warp 18 and the lower warp 19 are arranged one above the other. Compared with the case where it did, the up-down direction distance between both becomes short, and the thickness of the base fabric 10 becomes thin. Therefore, the seam felt 12 provided with this base fabric 10 is excellent in water squeezing and initial adaptability. Moreover, since the base fabric 10 is a warp two-layer, the strength in the warp direction is high and the durability is excellent. Moreover, since the loop 13 stands upright in the up-down direction and the warp direction, the loops 13 at both ends of the base fabric 10 can be easily put into each other compared to the case where the loop 13 is inclined with respect to the up-down direction. Excellent. If the difference in thickness between the ground portion 14 and the seam portion 15 is large, there may be a problem that the vibration at the time of passing through the nip becomes large and a problem that it is partially worn. If the diameter of the weft 17 to be used is thinner than that used for the ground portion 14, these problems can be solved or suppressed. The upper surface of the base portion 10 of the base fabric 10 facing the papermaking surface side of the seam felt 12 has little unevenness in the weave, is excellent in paper surface properties, and can prevent or suppress scratches and marks on the manufactured paper.

  Next, with reference to FIG. 7, the base fabric 30 which concerns on 2nd Embodiment is demonstrated. The base fabric 30 according to the second embodiment differs from the first embodiment in the arrangement of the first weft 20 and the second weft 21 in the complete structure of the base portion 31. In the description, the components of the ground portion 31 are denoted by the same reference numerals as those in the first embodiment, and the description of the configurations and functions and effects common to the first embodiment is omitted.

  The complete structure of the base fabric 30 is composed of four upper warps 18, lower warps 19, first wefts 20, and second wefts 21. Weft No. 1 ', 3', 6 'and 8' wefts 17 constitute the first weft 20, The 2 ′, 4 ′, 5 ′ and 7 ′ wefts 17 constitute the second weft 21. Weft No. of base fabric 30 The wefts 17 of 1 'to 8' are respectively weft No. 1 of the first embodiment shown in FIG. It corresponds to the wefts 17 of 1 ′, 8 ′, 3 ′, 6 ′, 5 ′, 4 ′, 7 ′ and 2 ′.

  Next, with reference to FIG. 8, the base fabric 40 which concerns on 3rd Embodiment is demonstrated. In the base fabric 40 according to the third embodiment, the complete structure of the base portion 14 is composed of six upper warps 18, six lower warps 19, six first wefts 41 and six second wefts 42. This is different from the base fabric 10 according to the first embodiment. FIG. 8 is a cross-sectional view as seen from the warp direction, showing the warp 16, the first weft 41 and the second weft 42.

  FIG. 8 shows how the first and second wefts 41 and 42 are woven into the upper and lower warps 18 and 19 when the upper warp 18 and the lower warp 19 are not overlapped vertically but shifted in the weft direction. When viewed from the warp direction, as in the first embodiment, when one side is reversed left and right, it coincides with the other. For example, the first weft 41 and the second weft 42 are warp Nos. 7 ″ on the lower warp 19 but intersects with the warp No. When one side is reversed left and right with the vertical line passing through the 7 ″ lower warp 19 as an axis, the way of weaving into the upper warp 18 and lower warp 19 is the same as the way of weaving into the other upper warp 18 and lower warp 19 Match. FIG. 8 shows one set of the first weft 41 and the second weft 42 each having six pieces in the complete structure, but the first weft 41 and the second weft 42 are the upper warp 18 and the lower warp 42, respectively. With respect to the warp yarn 19, the other first weft yarn 41 and the second weft yarn 42 are woven so as to be shifted by two warp yarns 16 in the weft direction.

  9 to 11 are photographs of examples of the base fabric 10 according to the first embodiment. In this embodiment, 48 warps 16 made of nylon monofilaments having a diameter of 0.37 mm are arranged per 2.54 cm (1 inch), and weft threads 17 made of nylon monofilaments having a diameter of 0.41 mm are arranged per 2.54 cm (1 inch). 44 were arranged. In the ground portion 14, as shown in FIGS. 9 to 11, the upper warp 18 and the lower warp 19 are maintained at positions shifted in the weft direction without overlapping each other. The average thickness of the ground portion 14 was 1.35 mm. On the other hand, in the woven end portion 22 of the seam portion 15, as shown in FIG. 11, the upper warp 18 and the lower warp 19 are stably arranged at positions where they overlap each other. The average thickness of the woven end portion 22 was 1.46 mm.

  This is the end of the description of the embodiment of the present invention, but the present invention is not limited to the above-described embodiment and can be widely modified. For example, the ground warp and weft patterns can also be applied to a seamless felt base fabric. Further, the number of weft yarns at the woven end portion can be changed as appropriate, and it is sufficient that the upper warp yarn and the lower warp yarn can be shifted from the state shifted from each other in the weft direction to the state where they overlap each other. For example, the number of weft yarns included in the complete structure About 0.5 times to 1.5 times. Alternatively, the upper warp may be arranged on the running surface side of the felt and the lower warp may be arranged on the paper making surface side of the felt.

10, 30, 40: Base fabric 13: Loop 14, 31: Base portion 15: Seam portion 16: Warp yarn 17: Weft yarn 18: Upper warp yarn 19: Lower warp yarn 20, 41: First weft yarn 21, 42: Second weft yarn 22 : Woven edge part

Claims (6)

A felt base fabric for papermaking having a ground portion in which upper and lower two layers of warp and one layer of weft are woven together,
The warp is composed of an upper warp arranged in the upper layer and a lower warp arranged in the lower layer,
The weft yarn is woven into the upper warp yarn and the lower warp yarn in the predetermined repeating unit in a different weaving method from the first weft yarn woven into the upper warp yarn and the lower warp yarn in a predetermined repeating unit. Each of the first and second wefts weaves one of the upper warps only once from above in the repeating unit, and one of the lower warps Weaving only once from below,
In the base portion, the upper warp and the lower warp are arranged so as to be shifted in the weft direction so as not to overlap each other, and the first weft and the second weft cooperate with each other to form the upper warp and When viewed from the warp direction, the upper warp and the lower warp are woven into the upper warp and the lower warp in a way that matches the other when viewed from the warp direction so that the vertical direction is the axis, and one is reversed left and right. A felt base fabric for papermaking. A pair of seam portions extending from both longitudinal ends of the ground portion;
Each of the pair of seam portions has a loop formed by folding back the warp yarns, and a woven end portion arranged between the loop and the ground portion and woven with the warp yarns and the weft yarns. ,
The upper warp and the lower warp forming the loop are arranged so as to overlap each other, and in the woven end portion, the weft maintains an arrangement in which the upper warp and the lower warp overlap in the loop. Therefore, the felt base fabric for papermaking according to claim 1, wherein either one of the first weft and the second weft is configured.   The felt base cloth for papermaking according to claim 2, wherein the weft constituting the seam portion has a smaller diameter than the weft constituting the ground portion. The base portion has a complete structure constituted by four upper warps, four lower warps, four first wefts and four second wefts,
The first weft consists of eight warps arranged in order on the lower warp, below the upper warp, below the lower warp, below the upper warp, above the lower warp, and above the upper warp. Lower, above the lower warp and above the upper warp are woven into the warp, and the four first wefts are arbitrary ones so that the positions where the warps are woven with each other are shifted in the weft direction. The remaining three first wefts are shifted in the weft direction by two, four and six warps, respectively, with respect to the first weft of
The second weft comprises eight warps arranged in order on the lower warp, below the upper warp, above the lower warp, above the upper warp, above the lower warp, and above the upper warp. Lower, lower warp and under the upper warp are woven into the warp, and the four second wefts are any one so that the positions where the warps are woven with each other are shifted in the weft direction. With respect to the second weft, the remaining three second wefts are arranged so as to be shifted in the weft direction by two, four and six warps respectively. The felt base fabric for papermaking as described in any one of Claims 1-3.   The said weft arranged in order in the said complete structure WHEREIN: The 1st-4th weft comprises the said 1st weft, and the 5th-8th weft comprises the said 2nd weft. The felt base fabric for papermaking as described.   In the complete structure, the first, third, sixth and eighth wefts constitute the first weft, and the second, fourth, fifth and seventh wefts constitute the second weft. The felt base fabric for papermaking according to claim 4.