JP7123776B2 - Felt base fabric for papermaking - Google Patents

Description

The present disclosure relates to papermaking felt substrates.

The press part of a paper machine mechanically extracts moisture from the wet paper, and is used for transporting and squeezing the wet paper. Papermaking felt consists of a base fabric in which warp and weft threads are interwoven with each other, and short fibers. It is formed integrally with the batt layer by needling. Felt for papermaking has properties such as wet paper transportability, water squeezing, surface property that does not leave marks on the paper surface (paper surface property), initial familiarity related to the time from being attached to the paper machine until it reaches a desirable state, and antifouling. performance, durability, etc. are required. The performance required for such papermaking felt is affected by the structure of the base fabric.

FIG. 7 shows conventional base fabrics 104, 105, and 106 having paper-making side warps 101, running side warps 102, and one layer of weft 103 woven into the paper-making side warps 101 and running side warps 102. indicates In FIG. 7A, the ratio of the numbers of the paper-making side warps 101 and the running side warps 102 is 1:1, and the paper-making side warps 101 and the running side warps 102 are arranged so as to overlap each other vertically. 1 shows a base fabric 104 with a warped double weave. The base fabric 104 of the warp double weave is less likely to cause problems such as clogging and dirt, but is thick and difficult to increase the felt density. Since the thickness of the knuckle part caused by the tack increases, weft knuckle marks tend to be attached to the paper and the surface property tends to be poor. In FIG. 7B, the ratio of the numbers of the paper-making side warps 101 and the running side warps 102 is 1:1, and the paper-making side warps 101 and the running side warps 102 are arranged so as not to overlap each other vertically. 1 shows a base fabric 105 with a warp 1.5-ply weave (see, for example, Patent Document 1). The base fabric 105 with a warp 1.5-ply weave is thin and the felt density tends to increase, so the initial familiarity is good. Since it is hard in the direction, it tends to cause blisters and wrinkles during running. In addition, since the number of warp yarns per unit length cannot be increased so much, the strength tends to be low. FIG. 7(C) shows a warp double warp (two upper and lower warps) in which the paper-making side warp 101 is thinner than the running side warp 102 and the number ratio between the paper-making side warp 101 and the running side warp 102 is 2:1. : 1) Shows a textured base fabric 106 (see, for example, Patent Document 2). Since the paper-making side warp 101 is thin, the knuckle portion is small and the surface property is good. Since the air permeability is high, problems such as clogging and staining are unlikely to occur, but the running side warp 102 has a long float state, so the bat can be used. There is a tendency that the tightness is deteriorated, the initial familiarity is poor, hair loss and fluffing are likely to occur, and the paper-making side warp yarns 101 tend to be easily pulled out during use of the paper-making felt. In addition, since the number of paper-making side warp yarns 101 is large, the production cost tends to be high.

JP 2013-234392 A JP 2009-155747 A

FIG. 8 is a reference example showing a base fabric 108 with a single layer structure having one layer of warp yarns 107 and one layer of weft yarns 103 woven into the warp yarns 107 . The base fabric 108 of the single-ply structure is thin, so it has good water absorption and initial conformability, but tends to be inferior in durability. In the base fabric 108 of the single weave shown in FIG. 8, a complete weave is constituted by eight warp yarns 107 and eight weft yarns 103, and each warp yarn 107 is arranged on the papermaking surface side of five continuous weft yarns 103. After passing through, the running surface side of three continuous wefts 103 is repeatedly passed, and an arbitrary warp 107 is shifted from another adjacent warp 107 by three wefts 103 . 103 is incorporated. In such a base fabric 108, as shown by the two-dot chain line in FIG. 8, the unevenness caused by the weaving of the warp yarns 107 and the weft yarns 103 is aligned in an oblique direction, so that oblique marks appear on the paper, resulting in poor surface properties. In addition, the base fabric 108 itself tends to be obliquely deformed, and the running of the papermaking felt becomes unstable when it is attached to the paper machine. Here, since the papermaking felt that carries the wet paper is sandwiched between two rolls that are paired one above the other, not only the irregularities on the papermaking surface of the base fabric, but also the irregularities on the running surface will cause marks on the paper. Easy to stick to.

An object of the present invention is to provide a felt base fabric for papermaking that is excellent in water squeezing, stain resistance and surface properties. A further object of at least some embodiments of the present invention is to provide a papermaking felt base fabric with excellent running stability.

At least some embodiments of the present invention are papermaking felt substrates (2, 12, 22, 32, 42) comprising warp yarns (4, 34, 44) and weft yarns (5, 35) interwoven with each other. , 45), and the warp passes through the paper-making surface side of (a+2) continuous wefts and then passes through the running surface side of a continuous wefts so as to be repeated. A first pair (6, 36, 46) composed of at least a part of the two warp yarns adjacent to each other on the left and right is a (a + 2) / a weave woven into the , only one of the two warps passes through the papermaking side of (a-1) continuous wefts, and then both of the two warps are three common continuous wefts , then only the other of the two warps passes through the papermaking side of (a-1) continuous wefts, and then both of the two warps are common to each other At least a part of the two warp yarns that are woven into the weft yarns so as to repeatedly pass through the running surface side of the one weft yarn, and that are different from the first pair and are adjacent to each other on the left and right. In the second pair (7, 37, 47), only one of the two warp yarns passes through the running surface side of a continuous weft yarns, and then both of the two warp yarns are common to each other. Then, only the other one of the two warp yarns passes through the running surface side of a continuous weft yarn, and then both of the two warp yarns The weft is woven into the weft so as to repeatedly pass through the paper-making surface side of the common weft. All the warp yarns constitute the first pair and 50% or more of the warp yarns constitute the second pair, or 50% or more of the warp yarns constitute the first pair and all the warp yarns It is preferable to configure the second pair.

According to this configuration, on the running surface side, the second pair forms running surface side warps of a pseudo a/1 design, and on the papermaking surface side, the first pair forms a pseudo (2a+1)/1 design on the paper making surface side. Since side warps are formed and the first pair on the paper-making side becomes a long float, surface properties are improved. The density of the warp yarns on the papermaking side is high and the density of the warp yarns on the running side is low. The float condition of the individual warp yarns is relatively short, so that the entanglement of the bat is improved.

In any of the configurations described above, in the base fabric according to at least some embodiments of the present invention, in half of the first pair, the right warp in the first pair is , the right warp in the first pair is offset by (a−1) wefts toward one of the warp directions, and in the remaining half of the first pair, the right warp in the first pair is offset by the left warp It is characterized in that it is shifted from the warp by (a−1) wefts toward the other in the warp direction. Here, the horizontal direction is the extending direction of the weft.

According to this configuration, in the first pair, half of the warp yarns are opposite to the other half in the warp direction in which the two warp yarns are shifted from each other. The length of the generated irregularities aligned in the oblique direction is shortened, oblique marks are less likely to be left on the paper, and the surface properties are improved.

The base fabric according to at least some embodiments of the present invention is characterized in that, in the configuration described above, the warp yarns have a 5/3, 4/2, or 6/4 weave.

According to this configuration, the entanglement of the bat is improved because the floating state of the individual warps is relatively small.

According to the present invention, it is possible to provide a felt base fabric for papermaking which is excellent in water squeezing property, antifouling property, surface property and running stability.

Organization chart of the felt base fabric for papermaking according to the first embodiment Sectional view of papermaking felt according to the first embodiment Organization chart of the felt base fabric for papermaking according to the first modified example of the first embodiment Organization chart of the felt base fabric for papermaking according to the second modification of the first embodiment Organization chart of the felt base fabric for papermaking according to the second embodiment Organization chart of the felt base fabric for papermaking according to the third embodiment Cross-sectional view of conventional felt base fabric for papermaking Organizational chart of felt base fabric for paper manufacturing according to reference example

Embodiments of the present invention will be described below with reference to the drawings. In the organizational charts shown in FIGS. 1, 3 to 6, and 8, if Figure A, which shows the paper-making side, is a plan view, Figure B, which shows the running side, is a left-right reverse of the bottom view. Equivalent to.

1 and 2 show a papermaking felt base fabric (hereinafter simply referred to as "base fabric") 2 in a papermaking felt 1 according to the first embodiment. The papermaking felt 1 is formed by integrating a base fabric 2 and a batt layer 3 made of short fibers by needling. The papermaking felt 1 is endless in the longitudinal direction (machine direction, warp direction) and is attached to a paper machine.

The base fabric 2 has one layer of warp yarns 4 extending in the length direction and one layer of weft yarns 5 extending in the width direction (cross-machine direction, weft direction, lateral direction), which are woven together. The complete weave of the base fabric 2 is composed of 16 warp yarns 4 and 8 weft yarns 5, each warp yarn 4 passing through the papermaking side of five continuous weft yarns 5, followed by three continuous weft yarns. It is a 5/3 weave that is woven into the weft 5 so as to repeatedly pass through the weft 5 on the running surface side.

No. 1', No. 5', No. 8' and no. The warp yarns 4 of 12′ are woven into the common weft yarns 5 (passing through the papermaking surface side of weft yarns No. 8 to 4 and passing through the running surface side of weft yarns No. 5 to 7). No. 1 is located at a position shifted downward in FIG. 2', No. 7', No. 10' and no. The warp yarns 4 of 15′ are woven into the common weft yarns 5 (the weft yarns Nos. 2 to 6 pass through the papermaking surface side and the weft yarns No. 7 to 1 pass through the running surface side). No. 1 is located at a position shifted downward in FIG. 4', No. 9', no. 13' and no. The warp yarns 4 of 16′ are woven into the common weft yarns 5 (the weft yarns Nos. 4 to 8 pass through the papermaking surface side and the weft yarns No. 1 to 3 pass through the running surface side). No. 1 is located at a position shifted downward in FIG. 3', No. 6', No. 11' and no. The warp yarns 4 of 14' are woven into the common weft yarns 5 (the weft yarns Nos. 6 and 2 pass through the papermaking surface side and the weft yarns No. 3 and No. 5 pass through the running surface side). By weaving in this manner, the following characteristics are produced on the paper-making surface side and the running surface side.

Focusing on the paper-making side, No. (2n-1)' and No. (2n)' warp yarns 4 constitute the first pair 6 (n is an integer from 1 to 8). No. The first pair 6 will be described using the warp yarns 4 of No. 1′ and 2′ as an example (hereinafter, “the first pair 6 of the warp yarns 4 of No. (2n-1)′ and No. (2n)′” will be referred to as the “first pair 6”). 1 pair (denoted as (2n-1)', (2n)')"). No. 1' warp yarns 4 are No. 8 to No. 4 through the paper-making surface side of the five continuous wefts 5 of No. 4; It passes through the running surface side of three continuous wefts 5, 5 to 7. No. 2' warp yarns 4 are No. 2 to No. 6 through the paper-making side of the five continuous wefts 5 of No. 6; It passes through the running surface side of three continuous wefts 5 of 7 to 1. No. 8 to No. On the paper-making side of the seven continuous wefts 5 of No. 6, no. 1' and no. 2' is present, and no. 7 on the running surface side of the weft 5, No. 1' and no. 2' are present. When at least one of the warps 4 adjacent to each other in the first pair 6 exists on the papermaking surface side in this way, the first pair 6 is assumed to exist on the papermaking surface side. It becomes the paper-making side warp of one design.

The first pairs (11′, 12′), (13′, 14′), (15′, 16′) and (1′, 2′) have even-numbered warp yarns 4 in each first pair 6 Two weft yarns 5 are woven at positions shifted downward in FIG. The first pairs (13′, 14′), (15′, 16′), (1′, 2′) and (11′, 12′) are respectively the first pairs (11′, 12′), ( 13', 14'), (15', 16') and (1', 2') are woven at positions shifted upward in FIG.

The first pairs (3', 4'), (5', 6'), (7', 8') and (9', 10') are such that in each first pair 6 the odd numbered warp yarns 4 are The weft yarns 5 are woven at positions shifted downward in FIG. The first pairs (5′,6′), (7′,8′) and (9′,10′), (3′,4′) are respectively the first pairs (3′,4′), ( 5′, 6′), (7′, 8′) and (9′, 10′) are woven in positions shifted downward in FIG. 1 by two wefts 5 . The first pairs (3′,4′), (5′,6′), (7′,8′) and (9′,10′) are respectively the first pairs (13′,14′), ( 11', 12'), (1', 2'), and (15', 16') (the extending direction of the weft 5 is the lateral direction). In the two adjacent warps 4 forming the first pair 6, the right warp 4 is woven at a position shifted downward in the figure from the left warp 4, and vice versa. The number is not limited to the one in which four are alternately arranged as described above, and for example, one or two may be alternately arranged.

On the other hand, focusing on the running surface side, No. (2n)' and No. (2n+1)' warp yarns 4 constitute the second pair 7 (n is an integer from 1 to 8, and (2n+1) is regarded as 1 when (2n+1) is 17). No. The second pair 7 will be described by taking the 2' and 3' warp yarns 4 as an example. No. 2' warp yarns 4 are No. 2 to No. 6 through the paper-making side of the five continuous wefts 5 of No. 6; It passes through the running surface side of three continuous wefts 5 of 7 to 1. No. The warp yarns 4 of 3′ are No. 6 to No. 2 through the paper-making side of the five continuous wefts 5 of No. 2; It passes through the running surface side of three continuous wefts 5 of 3 to 5. No. On the running surface side of the continuous three wefts 5 of 3 to 5 and 7 to 1, no. 2' and no. 3' is present and no. On the paper-making side of the wefts 5 of Nos. 2 and 6, No. 2' and no. Both 3' are present. In this way, the second pair 7 is considered to exist on the papermaking surface side when both warps 4 adjacent to each other in the second pair 7 exist on the papermaking surface side, and the second pair 7 exists when one of them exists on the running surface side. Assuming that 7 exists on the running surface side, the second pair 7 has a pseudo 3/1 design running surface side warp (1/3 design when viewed from the papermaking surface side). For this reason, bending is suppressed and the surface properties are improved.

The warp yarns 4 are preferably single twisted yarns of two or three monofilaments or twisted multifilament yarns. The single-twisted yarn may be obtained by twisting a plurality of monofilaments twisted in opposite directions. The weft yarn 5 is preferably a single-twisted yarn of three monofilaments or a twisted yarn obtained by twisting two single-twisted yarns of two monofilaments. By using twisted yarns as the warp yarns 4 and the weft yarns 5, the entanglement between the base fabric 2 and the batt is improved. The diameter of each monofilament used for the warp 4 and weft 5 is preferably 0.18 mm to 0.25 mm, and synthetic resins such as nylon, polyamide, polyester, polyethylene, polypropylene, and polyvinyl chloride are used as the material. Available. The warp yarns 4 are preferably between 55 and 85 threads per inch and the weft yarns 5 are preferably between 18 and 35 threads per inch.

On the running surface side, two warp yarns 4 adjacent to each other constituting the second pair 7 complement each other to form one running surface side warp yarn of a 3/1 design, and on the papermaking surface side, the first pair 6 is formed. The two warps 4 adjacent to each other form the paper-making side warp of a 7/1 design as if they were complementing each other. Looking at FIG. Among the weft yarns 5 of 1, 3, 5 and 7, eight warp yarns 4 are positioned on the papermaking surface side and eight warp yarns 4 are positioned on the running surface side in the complete design. Also, No. Of the 2, 4, 6 and 8 weft yarns 5, 12 warp yarns 4 are positioned on the papermaking surface side and 4 warp yarns 4 are positioned on the running surface side in the complete design. No. Focusing on the wefts 5 of 2, 4, 6, and 8, as shown in FIG. The ratio of the number of warp yarns 4 positioned on the face side is 12:4. Here, among the 12 warp yarns 4 passing through the paper-making surface side, 4 sets of 8 warp yarns 4 constitute the first pair 6 . For example, No. 2 weft yarns 5, the warp yarns 4 of the first pair (1′,2′), (5′,6′), (7′,8′) and (11′,12′) are both papermaking One of the two warp yarns 4 (Nos. 3′, 10′, 14′ and 15′) of the two warp yarns 4 forming the other first pair 6 passes through the papermaking surface side while passing through the surface side. . Since the two warp yarns 4 that make up the first pair 6 complement each other and function like one warp yarn 4, the two warp yarns 4 that make up the first pair 6 are regarded as one warp yarn 4. and No. 2, 4, 6, and 8 wefts 5, the number of warps 4 passing on the papermaking surface side is 8 (both warps 4 are located on the papermaking surface side There are four sets of first pairs 6, only one warp are four first pairs 6 located on the running surface side), the number of warp yarns 4 located on the running surface side is four, and the ratio is 2:1. Therefore, the arrangement of the warp yarns 4 with respect to the weft yarns 5 is similar to the paper-making surface side warp yarns 101 and the running surface side warp yarns 102 of the double warp (upper and lower 2:1) design shown in FIG. improves. On the other hand, since the number of warp yarns 4 per unit length is smaller than the total number of papermaking surface side warp yarns 101 and running surface side warp yarns 102 in a double warp (upper and lower 2:1) design, productivity is improved. Since the density of the warp yarns 4 on the paper-making surface side is high and the density of the warp yarns 4 on the running surface side is low, the water squeezability is good and clogging stains are less likely to occur.

Further, the first pair 6 forming a pseudo 7/1 design on the papermaking surface side has a relatively long float state of seven continuous wefts 5 on the papermaking surface side, thereby improving the surface property. If each warp yarn 4 becomes a long floating yarn state, the entanglement of the bat deteriorates. Since the three wefts 5 are relatively short on the side, the entanglement of the bat is improved.

In addition, in half of the first pair 6, the warp yarns 4 on the right side of the first pair 6 are shifted from the warp yarns 4 on the left side by two weft yarns 5 toward one side in the warp direction. , in the remaining half of the first pair 6, the right warp yarns 4 in said first pair 6 are offset from the left warp yarns 4 by two weft yarns 5 towards the other in the warp direction. there is That is, half of the first pair 6 have the warp directions in which the two warp yarns 4 are displaced from each other in the opposite direction to the remaining half. For this reason, the length in which the irregularities generated by the interweaving of the warp yarns 4 and the weft yarns 5 are aligned in the oblique direction is shortened. It becomes difficult to deform and the running becomes stable.

Next, a first modification of the first embodiment will be described with reference to FIG. In the description, the same reference numerals are given to the configurations common to the above main example of the first embodiment, and the description thereof is omitted. In the above main example, all the warp yarns 4 constitute the first pair 6, and all the warp yarns 4 constitute the second pair 7 in a combination different from the first pair 6. However, in the first modified example, It differs from the above main example in that only 50% of the warp yarns 4 constitute the first pair 6 .

The complete design of the base fabric 12 of the first modified example is composed of eight warp yarns 4 and eight weft yarns 5, and each warp yarn 4 is five continuous weft yarns 5 similar to the main example described above. It is a 5/3 weave that is woven into the weft yarn 5 so as to repeat passing through the surface side and then through the running surface side of three continuous weft yarns 5 .

No. The warp yarns 4 of 2′ to 8′ and 1′ are No. 3 at a position shifted downward in FIG. interwoven. By weaving in this manner, the following characteristics are produced on the paper-making surface side and the running surface side.

Focusing on the paper-making side, No. 1' and no. 2' warp 4 and No. 2' warp 4; 5' and no. 6' and the warp yarns 4 of No. 6' respectively constitute the first pair 6, which are the paper-making side warp yarns of a pseudo 7/1 design. 3' and no. 4' warp 4 and No. 4' warp 4; 7' and no. The warp yarns 4 of 8' do not constitute the first pair 6, respectively. In the first pair (1', 2'), No. 1' warp 4 is No. 1'. No. 2' warp yarn 4 is woven at a position shifted downward in FIG. 3 by two weft yarns 5. 6' warp 4 is No. It is woven at a position shifted downward in FIG. 3 by two wefts 5 from the warp 4 of 5'. When viewed as a pseudo 7/1 weave, the first pair (5′, 6′) is positioned downward in FIG. 3 by five wefts 5 relative to the first pair (1′, 2′). Positioned (No. 5' warp 4 of the first pair (5', 6') is five wefts 5 with respect to No. 2' warp 4 of the first pair (1', 2') 3 at the bottom of FIG. 3).

On the other hand, focusing on the running surface side, No. (2n)' and No. The (2n+1)′ warp yarns 4 constitute the second pair 7 of the running surface side warp yarns of a pseudo 3/1 design (n is an integer from 1 to 4, and when (2n+1) is 9, is considered to be 1).

Even with such a configuration in which 50% of the warp yarns 4 constitute the first pair 6 and all of the warp yarns 4 constitute the second pair 7, for the same reason as the above main example, water squeezing, Antifouling property, surface properties and running stability are improved. In addition, No. 3' and no. 4' warp 4 and No. 4' warp 4; 7' and no. The first pair 6 may be composed of either one of the warp yarns 4 of 8' and 75% of the warp yarns 4 may be changed to constitute the first pair 6. FIG.

Next, a second modification of the first embodiment will be described with reference to FIG. In the explanation, the same reference numerals are given to the configurations common to the main example of the first embodiment, and the explanation thereof is omitted. The second modification differs from the main example in that only 50% of the warp yarns 4 constitute the second pair 7 .

The complete structure of the base fabric 22 of the second modification is composed of eight warp yarns 4 and eight weft yarns 5, and each warp yarn 4 is five continuous as in the above main example and first modification. It is a 5/3 weave that is woven into the weft 5 so as to repeat passing through the paper-making surface side of the weft 5 and then through the running surface side of three continuous wefts 5 .

No. The warp yarns 4 of 2′ to 8′ and 1′ are No. In the position shifted downward in FIG. interwoven. By weaving in this manner, the following characteristics are produced on the paper-making surface side and the running surface side.

Focusing on the paper-making side, No. (2n-1)' and No. (2n)' warp yarns 4 constitute a first pair 6 of paper-making side warp yarns of a pseudo 7/1 design (n is an integer of 1 to 4). The first pairs (3′, 4′) and (7′, 8′) are such that in each first pair 6 the even-numbered warp yarns 4 outnumber the odd-numbered warp yarns 4 by two weft yarns 5. 4 is woven at a position shifted downward. The first pair (7', 8') is woven at a position shifted upward in FIG. 1 by one weft 5 from the first pair (3', 4').

The first pairs (1′,2′) and (5′,6′) are such that in each first pair 6, the odd numbered warp yarns 4 outnumber the even numbered warp yarns 4 by two weft yarns 5. 4 is woven at a position shifted downward. The first pair (5', 6') is woven at a position shifted upward in FIG. 4 by one weft 5 from the first pair (1', 2'). When viewed as a pseudo 7/1 organization, the first pairs (1′,2′) and (5′,6′) are the first pairs (7′,8′) and (3′,4 '), five weft yarns 5 and three weft yarns 5 are woven at positions shifted downward in FIG. No. 6' warp yarns of the first pair (5', 6') and No. 6' warp yarns of the first pair (7', 8') No. 7' warp yarns 4 and the first pair (3', 4'), the three wefts 5 are woven at positions shifted downward in FIG.

On the other hand, focusing on the running surface side, No. 2' and no. 3′ warp yarn 4 and No. 6' and no. The warp yarns 4 of 7' constitute a second pair 7 of running surface side warp yarns of a pseudo 3/1 design.

Even in the configuration in which all of the warp yarns 4 constitute the first pair 6 and 50% of the warp yarns 4 constitute the second pair 7, for the same reason as the above main example, water squeezing, Antifouling property, surface properties and running stability are improved. In addition, No. 4' and no. 5' warp 4 and No. 8' and no. The warp yarns 4 of 1′ and the warp yarns 4 of 1′ may constitute the second pair 7 so that 75% of the warp yarns 4 constitute the second pair 7 .

Next, a second embodiment according to the present invention will be described with reference to FIG. The base fabric 32 according to the second embodiment has one layer of warp yarns 34 and one layer of weft yarns 35 woven together. The structure of the individual warp yarns 34 and the lengths of the first pair 36 and the second pair 37 are different from those of the first embodiment. In FIG. 5, for the sake of convenience, the two warp yarns 34 forming a pair are shown close to each other.

The complete weave of the base fabric 32 is composed of 16 warp yarns 34 and 6 weft yarns 35, each warp yarn 34 passing on the papermaking side of four continuous weft yarns 35 followed by two continuous weft yarns 35. It is a 4/2 weave that is woven into the weft 35 so as to repeatedly pass through the running surface side of the weft 35 .

No. 1', No. 7' and no. The warp yarns 34 of 11' are woven into a common weft yarn 35 with each other. No. 5 is located at a position shifted downward in FIG. 4' and no. 12' warp yarns 34 are woven into a common weft yarn 35 with each other. No. 5 is located at a position shifted downward in FIG. 3', No. 9' and no. 15' warp yarns 34 are woven into a common weft yarn 35 with each other. No. 5 is located at a position shifted downward in FIG. 6', No. 10' and no. 16' warp yarns 34 are woven into a common weft yarn 35 with each other. No. 5 is located at a position shifted downward in FIG. 5' and no. The warp yarns 34 of 13' are woven into a common weft yarn 35 with each other. No. 5 is located at a position shifted downward in FIG. 2', No. 8' and no. The warp yarns 34 of 14' are woven into a common weft yarn 35 with each other. By weaving in this manner, the following characteristics are produced on the paper-making surface side and the running surface side.

Focusing on the paper-making side, No. (2n-1)' and No. (2n)' warp yarns 34 form a first pair 36 (n being an integer from 1 to 8). In the first pair 36, only one warp 34 passes through the papermaking side of one weft 35, then both warps 34 pass through the papermaking side of three continuous wefts 35, and then the other warp. The weft threads 34 are woven into the weft threads 35 so that only one weft thread 35 passes on the paper-making side of the weft thread 35 and then both warp threads 34 pass under the single weft thread 35 . When at least one of the mutually adjacent warps 34 in the first pair 36 exists on the papermaking surface side in this way, the first pair 36 is considered to exist on the papermaking surface side. It becomes the paper-making side warp of one design.

The first pairs (9', 10'), (11', 12'), (13', 14') and (15', 16') are such that in each first pair 36 the even numbered warp yarns 34 are It is woven at a position shifted downward in FIG. 5 by one weft 35 from the warp 34 of odd number. The first pairs (11′, 12′), (13′, 14′) and (15′, 16′) are respectively the first pairs (9′, 10′), (11′, 12′) and ( 13', 14'), the four wefts 35 are located below FIG. The first pair (9', 10') and the first pair (15', 16') are woven into a common weft thread 35 with each other.

The first pairs (1′,2′), (3′,4′), (5′,6′) and (7′,8′) are such that in each first pair 36 the odd numbered warp yarns 34 are It is woven at a position shifted downward in FIG. 5 by one weft 35 from the warp 34 of even number. The first pairs (3′,4′), (5′,6′) and (7′,8′) are respectively the first pairs (1′,2′), (3′,4′) and ( 5' and 6'), the two wefts 35 are woven at positions shifted downward in FIG. The first pair (1', 2') and the first pair (7', 8') are woven into a common weft 35 with each other.

On the other hand, focusing on the running surface side, No. (2n)' and No. (2n+1)' warp yarns 34 constitute the second pair 37 (n is an integer from 1 to 8, and (2n+1) is regarded as 1 when it is 17). In the second pair 37, only one warp 34 passes through the running side of two continuous wefts 35, then both warps 34 pass through the papermaking side of one weft 35, and then the other warp. Only the weft 34 is woven into the weft 35 so as to pass through the running side of two continuous wefts 35 and then both warps 34 pass through the papermaking side of one weft 35 . Thus, the second pair 37 is considered to exist on the papermaking surface side when both of the mutually adjacent warps 34 in the second pair 37 exist on the papermaking surface side, and when one exists on the running surface side, the second pair 37 is considered to exist on the papermaking surface side. Assuming that the second pair 37 exists on the running surface side, the second pair 37 becomes the running surface side warp of a pseudo 2/1 design (1/2 design when viewed from the papermaking surface side).

Even with such a configuration, for the same reason as in the first embodiment, water squeezing, antifouling properties, surface properties and running stability are improved.

Next, a third embodiment according to the present invention will be described with reference to FIG. The base fabric 42 according to the third embodiment has one layer of warp yarns 44 and one layer of weft yarns 45 woven together. The structure of the individual warp yarns 44 and the lengths of the first pair 46 and the second pair 47 are different from those of the first and second embodiments. In FIG. 6, two warp yarns 44 forming a pair are shown close to each other for the sake of convenience.

The complete weave of the base fabric 42 consists of 16 warp yarns 44 and 10 weft yarns 45, each warp yarn 44 passing through the papermaking side of six continuous weft yarns 45, followed by four continuous weft yarns 45. It is a 6/4 weave that is woven into the weft 45 so as to repeatedly pass along the running surface side of the weft 45 .

No. 1' and no. The 5′ warp yarns 44 are woven into a common weft yarn 45 with each other. No. 1 is located at a position shifted downward in FIG. A 10′ warp yarn 44 is woven into the weft yarn 45 . No. 1 is located at a position shifted downward in FIG. 7' and no. 15' warp yarns 44 are woven into a common weft yarn 45 with each other. No. 1 is located at a position shifted downward in FIG. 2′ warp yarns 44 are woven into weft yarns 45 . No. 1 is located at a position shifted downward in FIG. 9' and no. The warp yarns 44 of 13' are woven into a common weft yarn 45 with each other. No. 1 is located at a position shifted downward in FIG. 4' and no. 16' warp yarns 44 are woven into a common weft yarn 45 with each other. No. 1 is located at a position shifted downward in FIG. The warp yarn 44 of 11′ is woven into the weft yarn 45. As shown in FIG. No. 1 is located at a position shifted downward in FIG. 6' and no. The warp yarns 44 of 14' are woven into a common weft yarn 45 with each other. No. 1 is located at a position shifted downward in FIG. 3′ warp yarns 44 are woven into weft yarns 45 . No. 1 is located at a position shifted downward in FIG. 8' and no. 12' warp yarns 44 are woven into a common weft yarn 45 with each other. By weaving in this manner, the following characteristics are produced on the paper-making surface side and the running surface side.

Focusing on the paper-making side, No. (2n-1)' and No. (2n)' warp yarns 44 form a first pair 46 (n being an integer from 1 to 8). The first pair 46 has only one warp yarn 44 passing through the papermaking side of three continuous weft yarns 45, then both warp yarns 44 pass through the papermaking side of three continuous weft yarns 45, and then the other warp yarn 44. Only the warp yarn 44 is woven into the weft yarn 45 such that only the three continuous weft yarns 45 pass on the paper-making side, and then both warp yarns 44 pass under one weft yarn 45 repeatedly. When at least one of the warp yarns 44 adjacent to each other in the first pair 46 exists on the papermaking surface side, the first pair 46 is assumed to exist on the papermaking surface side. It becomes the paper-making side warp of one design.

The first pairs (11', 12'), (13', 14'), (15', 16') and (1', 2') are such that in each first pair 46 the even numbered warp yarns 44 are Three wefts 45 are woven at positions shifted downward in FIG. The first pairs (13′, 14′), (15′, 16′), (1′, 2′) and (11′, 12′) are respectively the first pairs (11′, 12′), ( 13', 14'), (15', 16') and (1', 2') are shifted downward in FIG. Woven into position.

The first pairs (3′,4′), (5′,6′), (7′,8′) and (9′,10′) are such that in each first pair 46 the odd numbered warp yarns 44 are Three wefts 45 are woven at positions shifted downward in FIG. The first pairs (5′,6′), (7′,8′) and (9′,10′), (3′,4′) are respectively the first pairs (3′,4′), ( 5′, 6′), (7′, 8′) and (9′, 10′) by two, two, two and four weft yarns 45 below FIG. .

On the other hand, focusing on the running surface side, No. (2n)' and No. (2n+1)' warp yarns 44 constitute the second pair 47 (n is an integer from 1 to 8, and (2n+1) is considered to be 1 when it is 17). In the second pair 47, only one warp 44 passes through the running side of four continuous wefts 45, then both warps 44 pass through the papermaking side of one weft 45, and then the other warp. Only the warp 44 is woven into the weft 45 so as to pass through the running side of four continuous wefts 45 and then both warps 44 pass through the papermaking side of one weft 45 . Thus, the second pair 47 is considered to exist on the papermaking surface side when both of the mutually adjacent warp yarns 44 in the second pair 47 exist on the papermaking surface side, and when one exists on the running surface side, the second pair 47 is considered to exist on the papermaking surface side. Assuming that the two pairs 47 exist on the running surface side, the second pair 47 becomes the running surface side warp of a pseudo 4/1 design (1/4 design when viewed from the papermaking surface side).

Even with such a configuration, for the same reason as in the first embodiment, water squeezing, antifouling properties, surface properties and running stability are improved.

Although the specific embodiments have been described above, the present invention is not limited to the above embodiments and can be widely modified. 2nd Embodiment or 3rd Embodiment, like the 1st modification or the 2nd modification of the 1st Embodiment, all the warp constitute one of the first pair and the second pair, 50% or more The warp yarns may be modified to form the other of the first pair and the second pair. The warp yarns may have a design other than 5/3, 4/2 and 6/4. In this case, the warp has a (a + 2) / a structure (a is an integer of 2 or more), and the first pair has only one of the two warps facing the papermaking side of (a-1) continuous wefts. Then, both of the two warps pass through the papermaking side of the three continuous wefts common to each other, and then only the other of the two warps passes through (a−1) continuous wefts. It is woven into the weft so that it passes through the papermaking surface side, and then both of the two warps pass through the papermaking surface side of one weft that is common to each other, and a pseudo (2a + 1) / 1 texture It becomes the paper-making side warp. The second pair becomes the running side warp of the pseudo a/1 design. The number of twills of the structure formed on the papermaking side ((2a+1)/1 structure with (2a+2) twills) is the number of twills of the structure formed on the running surface side ((a+1) twills with a/1 structure). is doubled.

1: Papermaking felt 2, 12, 22, 32, 42: Base fabric 3: Bat layers 4, 34, 44: Warp yarns 5, 35, 45: Weft yarns 6, 36, 46: First pair 7, 37, 47: second pair

Claims (4)

A felt base fabric for papermaking,
having warp and weft threads interwoven with each other;
The warp is woven into the weft so as to pass through (a+2) continuous wefts on the papermaking surface side and then pass through a continuous wefts on the running surface side (a+2)/a. organization, a is an integer of 2 or more,
In the first pair composed of at least part of the two warps adjacent to each other in the left and right direction, only one of the two warps passes through the papermaking surface side of (a−1) continuous wefts. , then both of the two warps pass through the paper-making side of the common three continuous wefts, and then only the other of the two warps continues (a-1). Woven into the weft so as to repeat passing through the paper-making surface side of the weft and then passing through the running surface side of one common weft both of the two warps,
A second pair composed of at least a part of the two warp yarns that are laterally adjacent to each other in a combination different from that of the first pair, wherein only one of the two warp yarns is a continuous weft yarn. Both of the two warps pass through the running surface side, then pass through the papermaking surface side of the one weft common to both of the two warps, and then only the other of the two warps passes through a continuous a number of the warps. It is characterized by being woven into the weft so as to pass through the running surface side of the weft and then pass through the papermaking surface side of the common weft in such a manner that both of the two warps pass through the papermaking surface side of the common weft. Felt base fabric for papermaking. All the warp yarns constitute the first pair, 50% or more of the warp yarns constitute the second pair, or 50% or more of the warp yarns constitute the first pair, and all the warp yarns constitute the first pair. 2. A papermaking felt base fabric according to claim 1, wherein warp yarns constitute said second pair. In the half of the first pair, the right warp in the first pair is displaced from the left warp by (a−1) wefts toward one side in the warp direction. In the remaining half of the first pair, the right warp in the first pair has (a−1) wefts in the other direction in the warp direction with respect to the left warp. 3. The felt base fabric for papermaking according to claim 1 or 2, characterized in that it is shifted by 1/4. The felt base fabric for papermaking according to any one of claims 1 to 3, wherein the warp yarns have a 5/3, 4/2, or 6/4 weave.

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