JP2724605B2 - 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 related to paper quality itself, such as preventing the occurrence of wire marks and sufficient entanglement of paper fibers, or problems with papermaking yield, (b) improving abrasion resistance, extending the service life of textiles, (C) Good aqueous problems. 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 an abrasion-resistant polyamide for the weft-wear type papermaking fabric, but the papermaking fabric using the polyamide is easily stretched and has a stable posture. There was a drawback that the properties were poor.

Therefore, attempts have been made to construct a papermaking fabric that is hard to stretch and has excellent posture stability by using polyester having excellent rigidity for both warp and weft.

In such a conventional papermaking fabric, in order to satisfy the above-mentioned requirements, it has been attempted to use a yarn having a large wire diameter as the weft on the running side of the papermaking fabric. Although it can be achieved to some extent, since the weft is thick, the balance between the weft and the warp is lost, the crimping property is deteriorated, and defects such as the generation of wire marks are present, and there are many practical problems.

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 relates to a method for manufacturing a liquid crystal display comprising the steps of “1. n × 2 (n is an integer of 7 or more) wefts are respectively arranged in upper and lower layers, and polyester yarn and polyamide yarn are used as the lower weft yarns. The lower layer polyamide weft is woven in one place by a pair of warps sandwiching one warp to be woven over the upper layer weft, and the lower layer polyester weft is woven in two places by the warp. The lower polyester weft is a weft woven at least at one location with a warp woven with a lower polyamide weft, and at two locations is a weft woven with a warp woven only with the lower polyester weft without weaving the lower polyamide weft. Double woven fabric for papermaking, consisting of weft yarns.

2. The papermaking double woven fabric according to claim 1, wherein the polyamide lower weft is a yarn having a larger wire diameter than the polyester lower weft.

3. The double woven fabric for papermaking according to any one of claims 1 to 2, wherein the ratio of the arrangement number of the polyamide lower weft and the polyester lower weft is 1: 3 to 3: 1. . About.

One of the features of the present invention is that the lower layer polyamide weft is bent by a strong force by a pair of warps sandwiching one warp passing over the upper layer weft into the structure, and the texture is formed at one position. It is to weave in.

That is, a weft is formed by a plurality of adjacent warps from one.
If it is bent at a point, the weft can certainly be bent with a stronger force than one warp, but if one side of the weft is pushed and bent with an adjacent warp in this way, the warp rebounds and the warp moves closer and the plane is in between Since there is no water space and the water in this portion becomes small, the water becomes non-uniform, causing wire marks. However, the present invention solves this problem by adopting a special structure in which the lower weft is woven by a pair of warps sandwiching a warp in which one lower weft is not woven. That is, at the weaving position of this lower weft,
The interposed warp does not interweave the lower weft, but escapes from the space between the two warps interposing the warp and interweaves the upper layer, that is, the weft of the papermaking surface. Since the lower weft is strongly woven in pairs, the crimping property is very good. Also, at the position where the lower layer weft is woven, the two warps forming a pair approach each other, so that the water space is reduced in a plane, but the three-dimensional water space is formed here due to the warp sandwiched between the two. Therefore, uneven distribution of the water space can be prevented.

Since the weft can be bent with a strong force, a thick polyamide weft can be used, and the wear-resistant volume can be further increased. With this special configuration, 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 fiber and the wire mark characteristics.

A second feature of the present invention is that a polyester lower weft forming a short crimp on a running surface of a woven fabric is woven into a structure at two places by a warp and at least one place is woven with the lower polyamide lower weft described above. 2 woven with the woven weft and the warp woven only with the lower polyester weft, without weaving the lower polyamide weft in both places
It consists of different types of wefts. Since the warp in which the polyester lower weft having excellent rigidity is woven has the structure in which the polyamide lower weft is woven, the posture of the warp is stabilized by the rigidity effect of the polyester lower weft, so the polyamide lower weft, which is slightly inferior in posture stability, has a texture. In addition, the posture stability of the papermaking fabric is greatly improved, and the weaving position of the lower weft is prevented from being unevenly distributed, so that the non-uniformity of the water can be prevented.

[Operation] The wear resistance of the running surface of the papermaking fabric is increased by increasing the wear volume of the wear-resistant yarn 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. This is because when the warp is worn, the dimensions of the woven fabric change or cutting occurs.

As described above, the papermaking fabric in which the wefts of the present invention are arranged vertically and doublely includes a polyester lower weft having excellent rigidity on the running surface and a polyamide lower weft having excellent wear resistance. Thereby, the crimp of the polyamide lower weft having excellent wear resistance can be lengthened. As a result, a thicker lower weft can be used on the running surface, which increases the wear resistance volume of the weft on the running surface without changing the surface properties of the conventional papermaking fabric, that is, the supportability of the pulp fiber and the wire mark characteristics. The wear resistance of the papermaking fabric can be greatly improved.

Actually, in a knuckle portion where warp wefts intersect and the yarn is sharply bent, there is a weft portion that does not perform abrasion resistance due to its crimp shape. In other words, within the same area, the smaller the number of knuckles, the better from the viewpoint of abrasion resistance, and the water is improved.

In addition, crimping property, that is, an index that can push and bend the weft while overcoming the repulsive force of the weft when the warp tries to bend the weft, 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 polyamide weft on the running surface of the woven fabric is woven once in a complete structure, a long crimp is formed, and the crimp is long, so that the crimp property is good, and a thick weft that could not be used conventionally is used. Since it can be arranged, the wear-resistant volume can be further increased.

Since the present invention forms the above structure on the running surface of the papermaking woven fabric, the effect on the papermaking surface is extremely small, and has little effect on the papermaking property of the papermaking surface, and changes to water-based and wire mark properties. Not seen.

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

[Embodiment] FIGS. 1 and 2 show that the warp and weft of the present invention have 16
FIG. 3 is a complete design diagram showing double-woven papermaking fabrics of 20 (20 shafts) and 20 (20 shafts), and FIG.
It is a complete design drawing which shows the double woven paper fabric of the shaft.
The numbers in the figure indicate the numbers of the warp and weft, respectively. In these examples, the number without dash is the warp,
The number with a dash is the weft. For convenience of explanation, the upper and lower wefts are indicated by the same numbers, but they will be described as needed.

In the drawings, the mark ○ indicates the position where the warp weaves the weft on the running surface, and the mark x indicates the position where the warp weaves the weft on the papermaking surface. ○ in the polyamide lower weft in each figure
Where the mark, X mark, and ○ mark are continuous, a pair of warps adjacent to each other with one warp projecting on the papermaking surface interposed therebetween is one of the running surfaces.
This indicates that the polyamide lower weft of the book is woven.

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.

The embodiment of FIG. 1 uses a long crimped polyamide weft
This is a 16-shaft 3: 1 cross-woven papermaking fabric in which three short crimped polyester lower weft yarns are arranged next to this.
In this example, it is understood that the lower crimp of the long crimp is 13 warps and the short crimp of the lower weft is 7 warps.

In FIG. 1, the polyamide lower wefts are 1 ', 5',
9 ', 13'.

In the embodiment of FIG. 1, the polyester lower weft 2 'is woven twice in the design with the warp 8 and the warp 16 and between the weaves shown in the organization chart repeated between the right and left sides of the organization chart. A crimp is formed between them, which is a short crimp with seven warps between them. On the other hand, the polyamide lower weft 1 'is woven with the warp yarns 13 and 15 to form a knuckle, and is interposed between the next knuckle of a complete design drawing (not shown) that repeats right or left.
It 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 13 in which the polyamide lower layer weft 1 'is woven
A warp 14 weaving the upper weft is sandwiched between the lower and upper wefts, but at the position where the warps 13 and 15 weave the lower weft 1 ', the warp 14 weaves the upper weft. The warp yarns 13 and 15 can approach each other, and the warp yarns 13 and 15 form a pair, and the lower weft yarns are strongly bent and woven into the structure. You. As described above, the warp 14 between the warps 13 and 15 exits upward from between the warps 13 and 15 at the position where the warps 13 and 15 weave the lower weft 1 ', and the warps 13 and 15 approach to each other and reach a flat surface. Although the space is reduced, the warp
A three-dimensional water space is formed by the presence of 14, and uneven distribution of the water space is prevented.

The embodiment shown in FIG. 2 is a 20-shaft 3: 2 cross-woven paper fabric in which a long crimp polyamide lower weft and a short crimp polyester lower weft are arranged in a ratio of 3: 2. This is an embodiment in which the arrangement is slightly broken. In this example, it is understood that the long crimp weft is 17 warps and the short crimp weft is 9 warps.

In the embodiment shown in FIG. 2, the polyester lower weft 1 'is woven twice in the design with the warp 3 and the warp 13 and between the weaving portions shown in the organization chart repeated between the right and left sides of the organization chart. It forms a short crimp crimp with nine warps in between. On the other hand, the polyamide lower weft 2 'is woven with the warp yarns 10 and 12 to form a knuckle and is repeated on the right or left side of the complete design (not shown)
A long crimp with 17 warps between the next knuckle is formed. For other lower wefts, polyester wefts form short crimps and polyamide wefts form long crimps.

Then, the warp 10 containing the polyamide lower layer weft 2 'is woven.
A warp 11 woven with an upper weft is sandwiched between the warp 11 and the warp 11 at a position where the warp 10 and 12 woven a lower weft 2 ′. The warp yarns 10 and 12 can approach each other, and the warp yarns 10 and 12 can be paired, and the lower weft yarns are strongly bent and woven into the structure. . And, as described above, the warp between warp 10 and warp 12
At the position where the warp yarns 10 and 12 are woven with the lower weft 2 ', the warp yarns 10 and 12 escape upward from between the warp yarns 10 and 12, and the warp yarns 10 and 12 approach each other and the flat water space is reduced.
A three-dimensional water space is formed due to the presence of water, and uneven distribution of the water space is prevented.

FIG. 3 is a complete design diagram showing a conventional 16-shaft double-woven papermaking fabric. In the double-woven paper fabric shown in FIG. 3, the weft 1 'forms a crimp with the warp 7 and the warp 15, and the weft 2' forms a crimp with the warp 2 and the warp 10. There are seven warps between the crimps. Thus, the crimp length of the conventionally used double-woven paper fabric is different from that of the present invention, and all are the same.

4 and 5 show the knuckle portion of the papermaking fabric. 21 to 23 are warps and 24 'is a weft projecting on the running surface. FIG. 4 shows the warp yarns 21, 22, 23 passing under the weft yarn 24 'and weaving the warp yarn 24'. Fifth
In the figure, the warps 21 and 23 pass under the weft 24 'and weave the weft 24', but the warp 22 does not weave the weft. It is clear that the hatched portions in FIGS. 4 and 5 do not exhibit wear resistance. That is, when the number of knuckles increases, the number of wefts having no wear-resistant function increases, and the effective wear-resistant volume decreases.

FIG. 6 shows the shape of the crimp. With warp 26
27 weaves the weft 25 'under the weft 25',
As is apparent from this figure, the warps 26 and 27 push the weft 25 'upward. The warps 29 and 30 receive the repulsive force of the weft 25 ', but push down the weft. Also warp 28
Pushes the weft downward, but its effect is smaller than that of the warp 29,30. 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 26 and the warp 27, the more the warp 28, 29,
The larger the number of 30, ..., the better the crimpability.

In the present invention, a polyamide crimp having a long crimp is arranged on the weft projecting on the running surface of the fabric, and furthermore, this thread can be made a thick thread, so that the abrasion resistance volume can be further increased and the abrasion resistance is improved. You can do it.

In the present invention, lower wefts having different lengths of crimps protruding toward the running side of the fabric may be arranged adjacent to each other or may not be arranged adjacent to each other. The number of arrangements may be the same or may be different.

In the present invention, the ratio of the number of arranged lower crimp polyamide lower wefts and shorter crimp polyester lower wefts projecting to the running side is 3: 1 to 1: 3 (2: 1, 3: 2, 1: 1). , 2: 3,
Including 1: 2. ).

For the weft projecting to the running side, it is preferable to set the ratio of the number of arrangement of the long crimp weft to the short crimp weft to 3: 1 to 1: 3 in view of the balance between improvement of abrasion resistance and maintenance of the posture of the fabric. Because. In other words, a long crimped weft has a large effect of abrasion 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 from the viewpoint of the long crimp, it is not preferable because the posture of the fabric is poorly maintained. 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.

If the length of the crimp of the weft projecting to the running side forming the wear-resistant surface is the same between the long crimps and the short crimps, the effect of maintaining the posture of the papermaking fabric is good, but not necessarily. If the length is not the same, there is no possibility that the wear resistance is not exhibited. It is important that a long crimp for abrasion resistance and a short crimp for maintaining the posture are arranged.

Thus, in the present invention, the effective abrasion resistance volume on the running side of the papermaking woven fabric can be significantly increased as compared with the conventional woven 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 the abrasion resistance of 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 shown in FIG. 1, the crimp volume is calculated for two adjacent wefts because the long crimp and the short crimped layer weft are arranged alternately. Calculations were made for the wefts of the book and the two were compared.

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

Similarly, in the embodiment of the present invention shown in FIG.
A crimp having a length of 7 × 2 = 14 warps is formed for one weft, and a crimp having a length of 13 warps is formed for the other weft. Since one warp is placed and two adjacent warps are paired and entangled with the weft, a thicker weft can be used.
mm, the wire diameter of the polyester weft is 0.22 mm, and 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 = is 0.247mm ^3. Therefore, the increase rate of the wear volume is [(0.247−0.181) /0.181] × 100 = 36.5 (%) That is, in the embodiment of the present invention, even if the simple calculation is performed,
37% larger wear volume.

Actually, as described above, the weft portion not related to wear resistance increases as the number of knuckles increases, so that the wear resistance volume of the present invention having less knuckles than the conventional example is much larger than this calculation. This is reflected in the results of the following comparative test.

 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, the time required for the lower weft to wear and break (wire life) was about 1.6 times that of the product of the present invention as compared with the conventional product.

[Effects] As described above, the papermaking woven fabric of the present invention has a longer crimp of the lower weft on its running surface, so that the crimpability is good, and a thick lower weft that could not be used conventionally can be used. Further, since two warps adjacent to each other with one warp interwoven with the weft on the papermaking surface form a pair and bend the running surface weft with a strong force, a thicker weft can be used. Sex increases dramatically. In addition, since the weft is woven strongly in this manner, the rigidity of the fabric is increased, and the effect of maintaining the posture is improved.

[Brief description of the drawings]

FIGS. 1 and 2 show an embodiment of the present invention, in which the complete structure of a papermaking double woven fabric composed of 16 (16 shafts) and 20 (20 shafts) warps and wefts, respectively. It is a complete design drawing showing. 4 and 5 show the knuckle portion of the papermaking fabric, and FIG.
The figure shows the shape of the crimp. Fig. 3 shows the conventional warp and weft, each 16 (16 shafts)
FIG. 2 is a complete design diagram showing a complete organization of a papermaking fabric composed of: 1-23, 26-30 ... warp 1'-20 ', 24', 25 '... weft

Claims (3)

(57) [Claims] 1. An n.times.2 (n is an integer of 7 or more) weft is arranged in two layers, a polyester yarn and a polyamide yarn are arranged in a lower weft, and a lower polyamide weft is formed in a complete structure. One pair of warps sandwiching one warp weaving over the upper weft is woven in one place, and the lower polyester weft is woven into the structure in two places by the warp, and the lower polyester weft is at least Completely composed of two types of wefts, one of which is a weft woven with a lower layer polyamide weft and the other is a weft woven with a lower layer polyester weft only, without weaving the lower layer polyamide weft. Double woven fabric for paper making with texture. 2. The papermaking double woven fabric according to claim 1, wherein the polyamide lower weft is a yarn having a larger wire diameter than the polyester lower weft. 3. The method according to claim 1, wherein the ratio of the number of the polyamide lower wefts to the polyester lower wefts is 1: 3 to 3: 1.
Item 3. The double woven fabric for papermaking according to any one of Items 2 to 2.