JP2678928B2 - Double woven fabric for papermaking - Google Patents

Description

The present invention relates to a double woven fabric for papermaking.

[Prior Art] There is a greater demand for papermaking fabrics than before. Broadly speaking, (a) problems such as prevention of wire marks, sufficient entanglement of paper fibers, problems related to paper quality itself or paper production yield problems, (b) improved abrasion resistance, extended service life of fabrics, ( C) There is a problem of good water quality. Although the problems are often related to each other, roughly speaking, the problem (a) is mainly related to the structure of the papermaking surface of the fabric, and the problem (b) is related to the structure of the running surface of the fabric. The relationship is deep, and (c) is a problem with the whole fabric.

Such a problem is a problem that must be solved not only for a multi-woven fabric but also for a single-woven fabric.

Conventionally, many proposals have been made for the solution (a). However, the problem of (b), that is, the improvement of the wear resistance of the papermaking fabric has not been sufficiently devised, and the running side of the papermaking fabric is of a weft-wear type, and is limited to the extent of preventing warp abrasion. .

However, in recent years, various conditions such as an increase in papermaking speed, an increase in the amount of filler used, and an increase in the necessity of producing neutral papermaking have been required, and the abrasion resistance of the papermaking fabric has become a major problem.

In order to improve such abrasion resistance, it has been attempted to use polyamide yarn having abrasion resistance in the related art, but a papermaking fabric using the polyamide yarn is liable to be stretched and has a drawback of poor posture stability. there were. In view of this, a polyester fabric, which has excellent wear resistance but is excellent in rigidity for both warp and weft yarns, is used to form a papermaking fabric that is difficult to stretch and has excellent posture stability.

In such a conventional papermaking fabric, the crimping of the running surface is always the same, as will be explained later.

In order to improve abrasion resistance even in such a conventional papermaking fabric, it has been attempted to use a yarn having a large wire diameter as the weft yarn on the running side of the papermaking fabric, and the abrasion resistance is improved to some extent. However, since the weft yarn is thick, there is a drawback that the balance between the weft yarn and the warp yarn is lost, the crimping property is deteriorated, and a wire mark is generated.

Further, as understood from the above problem (c), if the structure of the running surface changes, the water is also affected, and the problem cannot be solved by palliative means such as simply increasing the thickness of the lower weft.

[Problems to be Solved by the Invention] In view of the problems of the prior art as described above, the present invention has an adverse effect on the performance of papermaking such as water-based and wire mark properties of a papermaking fabric without adversely affecting the performance. It is intended to improve abrasion.

[Means for Solving the Problems] The present invention provides "1.times.2 (where n is an integer of 7 or more) wefts arranged in upper and lower two layers, respectively, and a lower layer weft comprising a polyester yarn and a polyamide yarn. The lower polyester weft is woven into the fabric at two locations, and the lower polyamide weft is fully woven into the fabric at one location with a pair of warp yarns sandwiching the upper weft yarn. A double woven paper fabric having a texture.

2. A double woven fabric for papermaking as set forth in claim 1, wherein a lower layer weft is woven into the design, and a warp without the lower layer weft is arranged next to the warp. 3. A lower layer polyamide weft is woven 1 At least one pair of warp yarns is a warp yarn in which a polyester weft yarn of a lower layer is woven. A double weave fabric for papermaking according to claim 1 or 2. 4. The polyamide weft yarn of the lower layer is formed from the polyester weft yarn of the lower layer. The double woven fabric for papermaking according to any one of claims 1 to 3, which is a yarn having a large wire diameter.

5. The papermaking fabric according to any one of claims 1 to 4, wherein the ratio of the number of lower layer polyamide wefts to the number of lower layer polyester wefts arranged is 1: 3 to 3: 1. . About.

Since the present invention is to form a running surface of the above-mentioned special structure on a papermaking fabric, the effect on the papermaking surface is extremely small, hardly affects the papermaking property of the papermaking surface, water-based, wire mark property Has not changed.

In the present invention, since the crimp of the polyamide weft protruding to the running side is long, the crimp property is good and a thick weft can be arranged as will be described later, and wear resistance can be further improved.

[Working] The wear resistance of the running surface of the papermaking fabric is increased by increasing the wear-resistant volume of the weft forming the running surface. It is desirable that the weft yarn has an abrasion resistance effect in view of the stability of the posture of the woven fabric during use and the extension of the service life. When the warp is worn, the dimensional change and cutting of the woven fabric occur and the service life is shortened.

One of the features of the present invention is that a polyester weft having excellent rigidity and excellent posture stability and a polyamide weft having excellent abrasion resistance are arranged on the running surface of a papermaking fabric in which wefts are arranged in upper and lower layers. By imparting a posture stabilizing action to the weft, the crimp of the polyamide weft having excellent abrasion resistance is lengthened and the abrasion resistance volume is increased.

A second feature of the present invention is that, at that position, one warp that does not weave the weft on the running surface is sandwiched and two adjacent warps form a pair and weave the polyamide weft on the running surface.

That is, a weft is formed by a plurality of adjacent warps from one.
It is possible to bend the weft yarn with a strong force if it is bent at a certain point, but when the weft yarn is bent at one place with the adjacent warp yarns in this way, the warp yarns are pushed by the repulsive force of the weft yarns and come close to each other, creating a flat space between them. Since the water content in this portion becomes small and the water content becomes non-uniform, which causes the generation of wire marks, the present invention uses a pair of warp threads with a warp thread not interwoven with one lower layer weft thread between them to form a lower layer weft thread. This problem was solved by adopting a special structure that weaves. That is, at the weaving position of the lower layer weft, the crumpled warp does not weave the lower layer weft, but comes out from between the two warp yarns sandwiching this weft, and weaves the upper layer, that is, the weft of the papermaking surface. The two wefts of No. 2 come close to each other to form a pair, and the lower layer weft is strongly woven, so that the crimping property becomes very good. Also, at the weaving position of the lower layer weft, the two warps forming a pair come close to each other, so the water space is reduced in plan view, but the presence of the warp sandwiched between the two forms a three-dimensional water space here. Uneven distribution of water space can be prevented. Since the yarn can be bent with a strong force, it is possible to use a thick lower layer weft, and the wear-resistant volume can be further increased. With this special structure, the present invention greatly improves the abrasion resistance of the papermaking fabric without changing the surface properties of the conventional papermaking fabric, that is, the supportability of the pulp fibers and the wire mark characteristics.

The third feature of the present invention is that the lower layer polyester weft is woven twice in a complete design to impart rigidity to the woven fabric and increase the stability of the posture. In the complete design, the effect of imparting rigidity to the woven fabric is increased by increasing the number of times of weaving. On the other hand, the polyamide lower layer weft has a characteristic that the wear volume is very large because a long crimp is formed.

In reality, the warp and weft yarns intersect with each other, and in the knuckle portion where the yarn is sharply bent, there are many weft yarn portions that do not exert the wear resistance due to the shape of the crimp. That is, in the same area, the smaller number of knuckles is advantageous in terms of wear resistance because the weft portion that does not perform wear resistance can be reduced and the effective wear resistance volume can be increased. Also, the water quality is improved.

In addition, crimp property, that is, when the warp tries to bend the weft, it is an index that can overcome the repulsive force of the weft and push and bend the weft, but this is the length of the crimp, that is, the warp and the warp that push up the weft. The longer the distance, the better. When the crimping property is improved, a thicker weft can be used.

In the present invention, since the crimp of the polyamide weft yarn on the running surface of the woven fabric is long, the crimp property is extremely good.

In this way, since the polyamide lower layer weft is bent with a strong force by a pair of warps and woven into the texture at one place, the crimp property is further improved, and a thick polyamide can be used, and the wear resistance is dramatically improved.

The present invention also relates to a double woven fabric for manufacturing, wherein the double woven fabric for papermaking having the above-mentioned constitution has a warp in which a lower polyester weft is woven in a structure and a warp in which a lower weft is not woven is arranged next to the warp. This double woven fabric for papermaking has very good posture stability because the warp yarn adjacent to the warp yarn in which the lower layer polyester weft yarn is woven is not worn or stretched or cut.

Furthermore, the present invention incorporates a lower layer polyamide weft 1
The present invention also relates to the above-described double woven fabric for papermaking, wherein at least one of the pair of warps is a warp in which a lower layer polyester weft is woven. That is, the polyester weft that forms a short crimp on the running surface of the woven fabric is woven into the design with at least one warp that is woven with the lower polyamide weft. Moreover, there are two weaving points. Since the warp yarn woven with the polyester weft yarn having excellent rigidity woven the polyamide weft yarn in this way, the posture of the warp yarn is also stabilized by the rigidity effect of the polyester weft yarn, and the polyamide weft yarn, which is slightly inferior in posture stability, is firmly and stably held in the structure. The posture stability of papermaking fabrics is greatly improved.

The increase in abrasion resistance volume and abrasion resistance will be specifically described in the following Examples in comparison with the conventional example.

[Embodiment] FIGS. 1 to 12 are each an embodiment of the present invention in which 16 warps and 16 wefts (16 shafts), 14 warps (14 shafts), 18 warps (18 shafts), and 20 warps are used. (20 shaft), 22
[Fig. 16] Fig. 16 is a complete design diagram showing a double woven papermaking fabric that is a book (22 shafts) and a booklet (24 shafts), and Fig. 16 is a complete design diagram showing a conventional papermaking fabric.

The numbers in the figure indicate the numbers of the warp and weft, respectively. In these examples, the non-dashed numbers are polyester warp yarns and the dashed numbers are weft yarns. For convenience of explanation, the weft yarns are indicated by the same numbers for the upper layer and the lower layer. I will explain each time it is necessary.

1 to 6 (excluding FIG. 5), odd numbers with dashes are polyester wefts, and even numbers with dashes are polyamide wefts.

5 and 7 to 12, the indication of the type of weft thread is slightly different, which will be described in detail in the section of the embodiment.

In FIGS. 1 to 12 and 16, the mark ○ indicates the position where the warp weaves the weft yarn on the running surface, and the mark × indicates the position where the warp weaves the weft yarn on the papermaking surface. In the polyamide wefts in each figure, where ○, ×, and ○ are continuous, one warp protruding on the papermaking surface is sandwiched by two adjacent warps that weave one weft on the running surface. Shows the place where the knuckle is formed.

Here, the distance between the mark and the continuous mark on the left and right indicates the length of the crimp of the weft forming the running surface of the papermaking fabric. In the examples shown in FIGS. 1 to 6, the arrangement of the long crimps and the short crimps of the lower layer weft is alternated, and the crimps having long crimp lengths are
It is clearly stated that they are the same. Also, the seventh
The embodiments of FIGS. 12 to 12 are embodiments in which the arrangement of long crimps and short crimps is not alternating.

FIG. 16 is a complete design diagram showing a conventional papermaking fabric,
The crimp lengths of the lower weft yarns are all the same.

Each embodiment will be sequentially described below, and the effects of the present invention will be described in comparison with a conventional example.

The polyester lower layer weft 1 ′ shown in FIG. 1 is a warp 5 and a warp.
13 and 2 are woven into the tissue twice, and between them and the weaving site shown in the tissue chart repeated on the right or left of this tissue chart, crimps are formed, but there are 7 crimps between them. It is a short crimp with warp threads. On the other hand, the polyamide lower layer weft 2'is a warp between a knuckle formed by weaving a polyester lower layer weft and a warp 5 and a warp 3 and a knuckle shown in a chart repeated on the right or left of this chart. It forms a long crimp of which 13 are present. For other lower wefts, polyester wefts form short crimps and polyamide wefts form long crimps.

Then, the warp 3 in which the polyamide lower layer weft 2'is woven
A warp 4 in which the upper layer weft is woven is sandwiched between the warp and the warp 5, but at the position where the lower layer weft 2'of the warp 3,5 is woven, the warp 4 is woven in the paper surface. The effect of slipping out from between 5 to the upper papermaking surface and allowing the warp yarns 3 and 5 to come close to each other, the warp yarns 3 and 5 forming a pair and strongly bending the lower layer weft yarns and weaving it into the structure, resulting in extremely good crimpability. Is played. Then, as described above, the warp 3 and the warp 5
At the position where the lower yarns 2'weave the warp yarns 3 and 5 between the warp yarns 3 and 5 come out from between the warp yarns 3 and 5 to the upper paper-making surface, the warp yarns 3 and 5 come close to each other, and the plane water space decreases. A three-dimensional water space is formed in this portion by the presence of the warp yarns 4, and uneven distribution of the water space is prevented.

FIG. 2 is an example of a papermaking fabric with 14 shafts. The polyester lower layer weft 1'is crimped twice between the warp 5 and the warp 11 by being woven into the design and between the weaving site shown in the design repeating on the right or left of this design. There are 5 or 7 crimps
A short crimp with warp threads present. On the other hand, the polyamide lower layer weft 2'includes a knuckle formed by weaving a polyester lower layer weft and a warp 5 and a warp 7.
A long crimp with 11 warp yarns is formed between the knuckle shown in the chart repeated on the right or left of this chart. For other lower wefts, polyester wefts form short crimps and polyamide wefts form long crimps.

Then, the warp yarn 5 in which the polyamide lower layer weft yarn 2'is woven
A warp 6 in which the upper layer weft is woven is sandwiched between the warp 7 and the warp 7, but at the position where the lower layer weft 2'of the warp 5,7 is woven, the warp 6 weaves the weft of the paper making surface. The warp yarns 5 and 7 can be approached by slipping out from between 7 to the upper paper-making surface. The warp yarns 5 and 7 form a pair and the lower layer weft is strongly bent and woven into the structure, so that the crimping effect is extremely good. Played. Then, as described above, the warp 6 between the warp 5 and the warp 7 comes out from between the warp 5 and 7 to the upper paper-making surface at the position where the lower weft 2'weaves the warp 5 and 7. And the planar water space decreases, but the presence of the warp threads 6 creates a three-dimensional water space in this area.
Uneven distribution of the water space is prevented.

FIG. 3 shows an example of a papermaking fabric having 18 shafts. The polyester lower layer weft 1'is woven into the design twice by the warp 7 and the warp 13 and forms a crimp between it and the weaving site shown in the design repeated to the right or left of this design. There are 5 or 11 crimps
A short crimp with warp threads present. On the other hand, the polyamide lower layer weft 2'includes a knuckle formed by weaving a polyester lower layer weft and a warp 11 and a warp 13.
It forms a long crimp with 15 warps between it and the knuckle shown in the chart repeated on the right or left of this chart. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 11 in which the polyamide lower layer weft yarn 2'is woven
The warp yarn 12 in which the upper layer weft yarn is woven is sandwiched between the warp yarn 13 and the warp yarn 13, but at the position where the lower layer weft yarn 2'of the warp yarns 11, 13 is woven, the warp yarn 12 weaves the weft yarn of the paper-making surface. 1
The effect of slipping out from between 3 to the upper papermaking surface and allowing the warps 11 and 13 to approach each other, and forming a pair of warps 11 and 13 that strongly bends the lower layer wefts and weaves it into the structure, resulting in extremely good crimpability. Is played. Then, as described above, the warp 12 between the warp 11 and the warp 13 comes out from between the warp 11 and 13 to the upper paper-making surface at the position where the lower weft 2'weaves the warp 11 and 13. However, the three-dimensional water space is formed at this portion due to the presence of the warp threads 12, and uneven distribution of the water space is prevented.

FIG. 4 is an example of a papermaking fabric having 20 shafts. The polyester lower layer weft 1'is woven into the design twice by the warp 3 and the warp 19 and forms a crimp between the weaving site shown in the design repeated on the right or left of this design. There are 3 or 15 crimps
A short crimp with warp threads present. On the other hand, the polyamide lower layer weft 2'is provided between the knuckle formed by weaving the polyester lower layer weft and the warp 17 and the warp 19 and the knuckle shown in the chart repeated on the right or left of this chart. Form a long crimp with 17 warps. Similarly for other lower layer wefts, polyester wefts form short crimps and polyamito wefts form long crimps.

Then, the warp yarn 17 in which the polyamide lower layer weft yarn 2'is woven
A warp 18 in which the upper layer weft is woven is sandwiched between the warp yarn 19 and the warp yarn 19, but at the position where the lower layer weft 2 ′ of the warp yarn 17,19 is woven, the weft yarn 18 in the papermaking surface is woven. The warp yarns 17 and 19 can come close to each other from the space between them to the upper side, and the warp yarns 17 and 19 form a pair to strongly bend the lower layer wefts and weave them into the structure, so that the crimping property is extremely good. Played. Then, as described above, the warp 18 between the warp 17 and the warp 19 comes out from between the warp 17 and 19 to the upper papermaking surface at the position where the lower weft 2'weaves the warp 17 and 19. However, the three-dimensional water space is formed at this portion due to the presence of the warp yarns 18, and uneven distribution of the water space is prevented.

FIG. 5 shows an example of a papermaking fabric having 22 shafts. In this example, the even wefts are polyester and the odd wefts are polyamide. The polyester weft 2'is woven twice into the design by the warp 7 and the warp 13 and forms a crimp between the design and the weaving site shown in the design repeated on the right or left of this design. However, this crimp is a short crimp with 5 or 15 warps. On the other hand, polyamide lower layer weft 1 '
Is a warp 11 and a warp 13 woven with a polyester lower weft.
A long crimp with 19 knuckles is formed between the knuckle formed by being woven with the knuckle and the knuckle shown in the organization chart repeated to the right or left of this organization chart. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 11 in which the polyamide lower layer weft yarn 1'is woven
The warp yarn 12 in which the upper layer weft yarn is woven is sandwiched between the warp yarn 13 and the warp yarn 13, but at the position where the lower layer weft yarn 1'of the warp yarns 11 and 13 is woven, the warp yarn 12 weaves the weft yarn of the papermaking surface. 1
The effect of slipping out from between 3 to the upper papermaking surface and allowing the warps 11 and 13 to approach each other, and forming a pair of warps 11 and 13 that strongly bends the lower layer wefts and weaves it into the structure, resulting in extremely good crimpability. Is played. Then, as described above, the warp 12 between the warp 11 and the warp 13 comes out from between the warp 11 and 13 to the upper papermaking surface at the position where the lower weft 1'weaves the warp 11 and 13. However, the three-dimensional water space is formed at this portion due to the presence of the warp threads 12, and uneven distribution of the water space is prevented.

FIG. 6 shows an example of a papermaking fabric having 24 shafts. The polyester lower layer weft 1 ′ is woven into the design twice by the warp 7 and the warp 19 and forms a crimp between it and the weaving site shown in the design repeated to the right or left of this design. However, this crimp is a short crimp with 11 warps. On the other hand, the polyamide lower layer weft 2'is a warp between a knuckle formed by weaving a polyester lower layer weft and a warp 17 and a warp 19 and a knuckle shown in a chart repeated on the right or left of this chart. Form a long crimp, with 21 present. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 17 in which the polyamide lower layer weft yarn 2'is woven
A warp 18 in which a lower weft is woven is sandwiched between the warp and the warp 19, but at the position where the lower weft 2 ′ of the warp 17, 19 is woven, the warp 18 woven the weft of the paper-making surface. 1
It is possible to approach the warp yarns 17 and 19 from the space between 9 and the upper side by making it possible to approach the warp yarns 17 and 19, and the warp yarns 17 and 19 form a pair to strongly bend the lower layer wefts and weave it into the structure, resulting in extremely good crimpability. Is played. Then, as described above, the warp 18 between the warp 17 and the warp 19 comes out from between the warp 178 and 19 to the upper papermaking surface at the position where the lower weft 2'weaves the warp 17 and 19. However, the three-dimensional water space is formed at this portion due to the presence of the warp yarns 18, and uneven distribution of the water space is prevented.

Further, in the present invention, weft yarns having different crimp lengths protruding to the running side of the fabric do not have to be arranged adjacent to each other, as will be described in the embodiments of FIGS. 7 to 12, and It is not necessary to arrange the same number.

The embodiment of FIG. 7 shows a long crimped polyamide weft yarn 2
It is an 18-shaft 2: 1 mixed woven papermaking fabric in which one polyester weft having a short crimp is arranged next to the main arrangement.

In the example of FIG. 7, it is understood that the long crimp polyamide lower layer weft has a length of 15 warps and the short crimp polyester lower weft has a length of 7 or 9 warps.

In Fig. 7, the polyamide lower layer wefts are 1 ', 2',
They are arranged at 4 ', 5', 7 ', 8', 10 ', 11', 13 ', 14', 16 ', 17'. In the embodiment shown in FIG. 7, the polyester lower layer weft 3'is woven twice into the design with the warp 1 and the warp 11, and the weaving portion shown in the design repeated between the two times and the right or left of this design. The crimp is a short crimp having 9 or 7 warps, which forms a crimp between and. On the other hand, the polyamide lower layer weft 2'is a warp between a knuckle formed by weaving a warp 9 and a warp 11 in which a polyester lower weft is woven, and a knuckle shown in a chart repeated on the right or left of this chart. Form a long crimp, with 15 present. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp 9 in which the polyamide lower layer weft 2'is woven
A warp 10 in which the upper layer weft is woven is sandwiched between the warp 11 and the warp 11, but at the position where the lower layer weft 2'of the warp 9,11 is woven, the warp 10 weaves the weft of the papermaking surface, and the warp 9,11 The warp threads 9 and 11 can come close to each other through the space between them, and the warp threads 9 and 11 become a pair, and the lower layer weft is strongly bent and woven into the structure, so that the crimping effect is extremely good. Played. Then, as described above, the warp 10 between the warp 9 and the warp 11 is pulled out from between the warp 9 and 11 to the upper paper-making surface at the position where the lower weft 2 ′ is woven. Although 11 approaches and the planar water space decreases, a three-dimensional water space is formed at this site due to the presence of the warp 10.
Uneven distribution of the water space is prevented.

Although not shown, an 18-shaft 2: 1 mixed woven paper fabric having a long crimped polyamide lower layer weft and two short crimped polyester lower layer wefts also has excellent abrasion resistance. Play.

The example of FIG. 8 is a 16: 1 shaft 3: 1 interwoven papermaking fabric in which three long crimped polyamide lower layer wefts are placed and then one short crimped polyester lower layer weft is placed. In this example, the lower crimp of the long crimp is the warp
It is understood that the lower crimp crimp weft of 13 threads is as long as 7 warps.

In Fig. 8, the polyamide lower layer wefts are 1 ', 2',
They are located at 3 ', 5', 6 ', 7', 9 ', 10', 11 ', 13', 14 ', 15'.

In the embodiment of FIG. 8, polyester lower layer weft 4 '
Is woven twice into the design with warp 3 and warp 11, while
And, a crimp is formed between the weaving site shown in the tissue chart repeated on the right or left of this tissue chart, and this crimp is a short crimp having seven warps. On the other hand, in the polyamide lower layer weft 3 ′, 13 warps are formed between the knuckle formed by the warp 5 and the warp 3 in which the polyester lower layer weft is woven, and the knuckle shown in the structure chart repeated to the right or left of this structure chart. Forms long crimps that are present. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 3 in which the polyamide lower layer weft yarn 3'is woven
A warp 4 in which the upper layer weft is woven is sandwiched between the warp 5 and the warp 5, but at the position where the lower layer weft 3 ′ of the warp 3, 5 is woven, the warp 4 woven the weft of the paper-making surface. The effect of slipping out from between 5 to the upper papermaking surface and allowing the warp yarns 3 and 5 to come close to each other, the warp yarns 3 and 5 forming a pair and strongly bending the lower layer weft yarns and weaving it into the structure, resulting in extremely good crimpability. Is played. Then, as described above, the warp 3 and the warp 5
At the position where the lower yarns 3'weave in the lower yarns 3 ', the warp yarns 4 between are coming out from between the warp yarns 3 and 5 to the upper papermaking surface, and the warp yarns 3 and 5 come close to each other, but the plane water space decreases. A three-dimensional water space is formed in this portion by the presence of the warp yarns 4, and uneven distribution of the water space is prevented.

The embodiment of FIG. 9 is a 16-shaft 1: 3 interwoven papermaking fabric in which one long crimp polyamide lower layer weft is arranged and then three short crimp polyester lower layer wefts are arranged.

In Fig. 9, the polyamide lower layer weft is 1 ', 5',
It is located at 9 ', 13'.

In the embodiment of FIG. 9, polyester lower layer weft 2 '
Is woven twice into the design with warp 5 and warp 13, while
And, a crimp is formed between the weaving site shown in the tissue chart repeated on the right or left of this tissue chart, and this crimp is a short crimp having seven warps. On the other hand, the polyamide lower layer weft 1'is provided between the knuckle formed by weaving the polyester lower layer weft and the warp 13 and the knuckle formed by the warp 15, and the knuckle shown in the organization chart repeated to the right or left of this organization chart. Forms a long crimp with 13 warps. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 13 in which the polyamide lower layer weft yarn 1'is woven
A warp yarn 14 in which an upper layer weft yarn is woven is sandwiched between the warp yarn 15 and the warp yarn 15, but at the position where the lower layer weft yarn 1'of the warp yarns 13 and 15 is woven, the warp yarn 14 weaves the weft yarn of the papermaking surface. 1
It becomes possible to approach the warp threads 13 and 15 from between 5 and the upper side of the paper making surface, and the warp threads 13 and 15 become a pair and bend the lower layer weft strongly and weave it into the structure, so that the effect of extremely good crimpability is obtained. Played. Then, as described above, the warp 14 between the warp 13 and the warp 15 comes out from between the warp 13 and 15 to the upper paper-making surface at the position where the lower weft 1'weaves the warp 13 and 15. However, the three-dimensional water space is formed at this portion due to the presence of the warp yarns 14, and uneven distribution of the water space is prevented.

The embodiment of FIG. 10 is a 20-shaft 3: 2 interwoven papermaking fabric having a ratio of long crimp weft to short crimp weft of 3: 2. In Fig. 13, 1 ', 3', 5 ', 6',
8 ', 10', 11 ', 13', 15 ', 16', 18 ', 20' are polyamide lower layer wefts with long crimps, and others are polyester lower layer wefts with short crimps.

In the embodiment of FIG. 10, polyester lower layer weft 2 '
Is woven twice into the design with warp 7 and warp 19, while
And, a crimp is formed between the weaving site shown in the tissue chart repeated on the right or left of the tissue chart, and the crimp is a crimp having 11 or 7 warps. On the other hand, the polyamide lower layer weft 1'is a warp formed between a knuckle formed by weaving a polyester lower layer weft and a warp 3 and a warp 5, and a knuckle shown in a chart repeated on the right or left of this chart. It forms long crimps, of which 17 are present. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 3 in which the polyamide lower layer weft yarn 1'is woven
The warp yarn 4 in which the upper layer weft yarn is woven is sandwiched between the warp yarn 5 and the warp yarn 5, but at the position where the lower layer weft yarn 1 ′ of the warp yarns 3, 5 is woven, the warp yarn 4 is woven into the paper making surface. The effect of slipping out from between 5 to the upper papermaking surface and allowing the warp yarns 3 and 5 to come close to each other, the warp yarns 3 and 5 forming a pair and strongly bending the lower layer weft yarns and weaving it into the structure, resulting in extremely good crimpability. Is played. Then, as described above, the warp 3 and the warp 5
The warp yarns 4 between the warp yarns 3 and 5 come out from between the warp yarns 3 and 5 to the upper paper-making surface at the position where the lower layer weft yarns 1'weave, and the warp yarns 3 and 5 come close to each other, but the plane water space decreases. In this portion, the presence of the warp yarns 4 forms a three-dimensional water space and uneven distribution of the water space is prevented. In the embodiment shown in FIG. 11, the ratio of the long crimp lower layer weft to the short crimp lower layer weft is 2 : 3 and 20 shaft
2: 3 Woven paper woven fabric. In FIG. 11, 2 ', 4',
7 ', 9', 12 ', 14', 17 ', 19' are polyamide lower layer wefts with long crimps, and the others are polyester lower layer wefts with short crimps.

In the embodiment of FIG. 11, the polyester lower layer weft 1 '
Forms a crimp between the warp 5 and the warp 15 which are woven twice into the design and between the part and the woven part shown in the design repeated on the right or left of this design.
This crimp is a short crimp with nine warp threads. On the other hand, the polyamide lower layer weft 2'is provided between a knuckle formed by weaving a warp 7 and a warp 9 in which a polyester lower weft is woven, and a knuckle shown in a structure chart repeated to the right or left of this structure chart. Form a long crimp with 17 warps. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 7 in which the polyamide lower layer weft yarn 2'is woven
A warp 8 in which an upper layer weft is woven is sandwiched between the warp 9 and the warp 9, but at a position where the lower layer weft 2 ′ of the warp 7,9 is woven, the warp 8 is woven in the paper-making surface. It is possible to approach the warp yarns 7 and 9 by pulling out from between 9 to the upper papermaking surface, and the warp yarns 7 and 9 form a pair and bend the lower layer weft strongly and weave it into the structure, so the crimping property is extremely good Is played. Then, as described above, the warp 7 and the warp 9
At the position where the warp yarns 7 and 9 interweave the lower layer weft yarn 2 ′, the warp yarns 8 to 9 are pulled out from between the warp yarns 7 and 9 to the upper papermaking surface, and the warp yarns 7 and 9 come close to each other, but the plane water space decreases. A three-dimensional water space is formed in this portion due to the presence of the warp yarns 8, and uneven distribution of the water space is prevented.

In the embodiment shown in FIG. 12, the ratio of the long crimp lower layer weft to the short crimp lower layer weft is set to 3: 2, and
3: 2 Mixed woven fabric for papermaking. In FIG. 12, 1 ', 3',
5 ', 6', 8 ', 10', 11 ', 13', 15 ', 16', 18 ', 20' are polyamide lower layer wefts with long crimps, others are short crimps Polyester lower layer weft.

In the embodiment of FIG. 12, polyester lower layer weft 2 '
Is woven twice into the design with warp 10 and warp 20, while
A crimp is formed between the weaving site shown in the tissue chart repeated on the right or left of the tissue chart, and the crimp is a short crimp having nine warps. On the other hand, the polyamide lower layer weft 1'is the warp between the knuckle formed by weaving the polyester lower layer weft and the warp 15 and the warp 13 and the knuckle shown in the organization chart repeated to the right or left of this organization chart. It forms long crimps, of which 17 are present. For other lower wefts as well, polyester lower wefts form shorter crimps and polyamide lower wefts form longer crimps.

Then, the warp yarn 13 in which the polyamide lower layer weft yarn 1'is woven
A warp yarn 14 in which an upper layer weft yarn is woven is sandwiched between the warp yarn 15 and the warp yarn 15, but at the position where the lower layer weft yarn 1'of the warp yarns 13 and 15 is woven, the warp yarn 14 weaves the weft yarn of the papermaking surface. 1
It becomes possible to approach the warp yarns 13 and 15 from the space between 5 and to the upper side of the paper making surface, and the warp yarns 13 and 15 form a pair to bend the lower layer weft strongly and weave it into the structure, resulting in an extremely good crimping effect. Is played. Then, as described above, the warp 14 between the warp 13 and the warp 15 comes out from between the warp 13 and 15 to the upper paper-making surface at the position where the lower weft 1'weaves the warp 13 and 15. However, the three-dimensional water space is formed at this portion due to the presence of the warp yarns 14, and uneven distribution of the water space is prevented.

FIG. 16 is a complete design view of a conventionally used papermaking fabric, showing a 16-shaft 1: 1 interwoven papermaking fabric composed of crimp wefts of the same length. In FIG. 16, 2 ',
4 ', 6', 8 ', 10', 12 ', 14', 16 'are polyamide wefts and the other wefts are polyester wefts.

In the papermaking fabric of FIG. 16, polyester warp 1 '
Is woven twice into the design with the warp yarn 7 and the warp yarn 15 to form a crimp therebetween, and this crimp is a crimp having seven warp yarns. The polyamide weft 2'is woven twice into the design with the warp 2 and the warp 10 to form a crimp, and the crimp is a crimp having seven warps. As described above, the crimp lengths of the lower wefts of the conventional papermaking fabrics that have been conventionally used are all the same.

Although a detailed comparison will be described later, as described above, the same 16-shaft papermaking woven fabric as shown in FIG. 1 is clearly shown as a lower layer than the conventional papermaking woven fabric of FIG. It is understood that the length of the weft crimp is increased. That is, the weft of FIG. 16 forms a short crimp with seven warps between the crimps,
Polyamide wefts are placed between the parts that weave
It forms a long crimp with 13 warp threads.

13 and 14 show a knuckle portion of a papermaking fabric. 25 to 27 are warp yarns, and 28 'is a weft projecting from the running surface. FIG. 13 shows the weft 26 passing under the warp 28 'and weaving it, and FIG. 14 shows the warp 26 passing over the weft 28' and not weaving. It is clear that the shaded areas in FIGS. 13 and 14 do not exhibit wear resistance. That is, as the number of knuckles increases, the number of weft yarns having no wear resistance function increases and the effective wear volume decreases.

FIG. 15 shows the shape of the crimp. With warp 30
31 passes under the weft 29 ′ and weaves the weft 29 ′,
As is clear from this figure, the warp yarns 30 and 31 push the weft yarn 29 'upward. Further, the warp yarns 33 and 34 receive the repulsive force of the weft yarn 29 ', but push down the weft yarn 29'. Also warp
32 pushes the weft 29 ′ downward, but its action is warp 33,3
Smaller than 4. An index for the warp to push and bend the weft over the repulsion of the weft is called crimping property. If the crimping property is good, a thicker weft can be used.

The longer the distance between the warp yarn 30 and the warp yarn 31, the more the warp yarns 32, 33,
The greater the number of 34, ..., the better the crimpability.

Next, in the present invention, the ratio of the number of arranged long crimp polyamide wefts and short crimp polyester wefts protruding to the running side is 3: 1 to 1: 3 (2: 1,3: 2,1: 1,2: 3,1:
Including 2. ) Is preferable.

The ratio of the long crimp weft and the short crimp weft in the running side is set to 3: 1 to 1: 3 because it is preferable from the viewpoint of improving wear resistance and maintaining the posture of the fabric. . That is, a long crimp weft has a great effect on wear resistance. However, the effect of maintaining the posture of the woven fabric is small because the number of times of weaving by the warp is small. On the other hand, the short crimped weft has a large effect of maintaining the posture of the woven fabric, but has a small wear resistance. If the ratio of the long crimp weft to the short crimp weft is 3: 1 or more as seen from the long crimp weft, the posture of the fabric is not maintained well, which is not preferable. If the ratio of the two is less than 1: 3, the abrasion resistance deteriorates, which is also not preferable. In addition, a step is generated between the long crimp and the short crimp. When the ratio is 3: 1 to 1: 3, the step is reduced and the running surface is smoothed.

When the lengths of the crimps of the weft yarns protruding to the running side forming the wear resistant surface are the same for the long crimps and for the short crimps, there is an effect that the posture of the papermaking fabric is maintained well, but not necessarily. If they are not the same length, it does not mean that wear resistance is not achieved. It is important to have a long crimp that is wear resistant and a short crimp that is responsible for maintaining posture.

As described above, in the present invention, the effective abrasion-resistant volume on the running side of the papermaking fabric can be significantly increased as compared with the conventional fabric, and the abrasion resistance can be dramatically improved. This is illustrated in a comparative test below.

The papermaking fabric of the present invention shown in FIG.
The comparison of abrasion resistance with the conventional papermaking fabric of the figure is shown.

First, in calculating the crimp volume of the weft to compare the abrasion volume, the crimp was cylindrical between the warps. Actually, as will be described later, since there is a portion which is not related to wear existing above the bent portion of the weft or the warp, the wear volume is smaller in the conventional example. In the embodiment of FIG. 1, a long crimp and a crimp shorter than this are formed on the lower layer weft every other one. Therefore, the volume of the crimp was calculated for two adjacent wefts. The wefts in the book were calculated and compared.

Regarding the papermaking fabric made of the same 16 warps and wefts shown in FIGS. 1 and 16, two adjacent wefts are
In the conventional example shown in FIG. 16, since seven warps are arranged between each warp forming a crimp, a crimp having a length of 7 × 4 = 28 is formed. The volume is 28 times 0.17 × (0.22 / 2) ² π = 0.181 mm ^{3 when} the wire diameter of the warp is 0.17 mm and the wire diameter of the weft is 0.22 mm.

Similarly, in the embodiment of the present invention shown in FIG.
One of the wefts has a crimp with a length of 7 × 2 = 14 warps, and the other weft has a crimp with a length of 13 warps. And, since one adjacent warp is paired with two adjacent warps and weaves are woven in, a thick weft can be used, so the warp has a diameter of 0.17 mm, and the polyester weft has a diameter of 0.22 mm. Since the wire diameter of the polyamide weft is 0.30 mm, the crimp volume is
14 × 0.17 × (0.22 / 2) ² π + 13 × 0.17 × (0.30 / 2) ² π = 0.247 mm ³ . Therefore, the increase rate of the wear volume is [(0.247-0.181) /0.181] × 100 = 36.5 (%) That is, the wear volume is large by about 37% in the grand command of the present invention even by simple calculation.

 The results of the comparative test are shown in Table 1 below.

Test method: The test was carried out using an abrasion tester manufactured by Nippon Fircon (utility model registration No. 1350124) and using heavy calcium carbonate as a filler.

Test results: As shown in Table 1, in the product of the present invention, the time until the lower weft was frictionally cut (wire life) was about 1.6 times that in the conventional product.

[Effect] As described above, the paper-making fabric for paper of the present invention has, on the running surface thereof, the crimp of the polyamide lower layer weft, which is excellent in abrasion resistance, forms a much longer crimp due to the crimp of the polyester lower layer weft, Since the crimping property becomes good, it is possible to use a thick polyamide lower layer weft which could not be used conventionally, and the polyester lower layer weft having excellent rigidity is woven by forming a short crimp, so that the rigidity of the woven fabric is good.

Further, in the papermaking fabric of the present invention, one warp yarn is sandwiched between two adjacent warp yarns to form a pair, and the weft yarn on the running surface is bent with a strong force. Therefore, a thicker polyamide weft yarn can be used. Therefore, maintaining the posture of the fabric, that is, preventing elongation during use, does not adversely affect the papermaking performance such as water and wire mark properties of the fabric, and does not impair the rigidity of the fabric, Further, since the warp of the papermaking fabric of the present invention is arranged such that the weft yarns of the running surface are not woven, the papermaking fabric is not cut even if the running surface warp is worn away, and wear resistance is improved. It is possible to dramatically improve the sex.

[Brief description of the drawings]

1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG.
FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11 and FIG. 12 show an embodiment of the present invention in which 16 warps and 16 wefts (16 shafts) and 14 wefts, respectively. 14 shafts), 18 (18 shafts), 20 (20 shafts), 22 (22 shafts) and 24
Book (24 shaft), 18 shaft, 16 shaft, 16 book (16
FIG. 1 is a complete design diagram of a double-woven fabric for papermaking having a complete structure composed of 20 shafts, 20 shafts, 20 shafts, 20 shafts, 20 shafts. Figures 13 and 14 show the knuckle part of the papermaking fabric,
The figure shows the shape of the crimp. Fig. 16 shows 16 warps and 16 wefts (16 shafts) in the conventional example.
1 is a complete design diagram of a papermaking double woven fabric having a complete structure composed of: 1-27,30,31 ... warp 1'-24 ', 28', 29 '... weft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 56-21876 (JP, B2) JP 63-50472 (JP, B2) JP 63-52155 (JP, B2) JP 63- 502291 (JP, A)

Claims (5)

(57) [Claims] 1. N × 2 wefts (n is an integer of 7 or more) are respectively arranged in upper and lower two layers, polyester yarns and polyamide yarns are arranged in the lower weft yarns, and the lower polyester weft yarns are provided in two places. A double woven fabric for papermaking having a complete design in which the lower layer polyamide weft is woven into the design and is woven into the design at one place by a pair of warp yarns that sandwich one warp yarn passing over the upper layer weft yarn. 2. A warp in which the lower layer weft is not woven is arranged next to a warp in which the lower layer polyester weft is woven into the design.
Double woven fabric for papermaking according to claim 1. 3. A double woven fabric for papermaking according to claim 1 or 2, wherein at least one of a pair of warps in which the lower layer of polyamide weft is woven is a warp in which a lower layer of polyester weft is woven. 4. The polyamide weft as the lower layer is a yarn having a larger wire diameter than the polyester weft as the lower layer.
Item 2. A double woven fabric for papermaking according to any one of items 3 to 3. 5. The method according to any one of claims 1 to 4, wherein the ratio of the number of arranged polyamide wefts in the lower layer to the number of arranged polyester wefts in the lower layer is 1: 3 to 3: 1. Textiles for papermaking.