JP2001159086A - Two-layer woven fabric for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity in a fabric-joining step. SOLUTION: A structure of a binding yarn, e.g. a binding yarn 3' is passed through the upper side of one warp 6 on papermaking surface side and then, passed through between two warps 7 and 8 on papermaking surface side and wefts 7 and 8 on traveling surface side and passed through the upper side of one warp 1 on papermaking surface side and woven with woven fabric on papermaking surface side and passed through between one warp 2 on papermaking surface side and weft 2 on traveling surface side and passed through the lower inside of two warps 3 and 4 on traveling surface side parallel arranged and passed through between one warp on papermaking surface side and weft 5 on traveling surface side to provide a structure weaving with woven fabric on traveling surface side and further, the binding yarn is arranged so as to pass through the upper side of whole warps on papermaking surface side in a complete structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to papermaking fabrics, and more particularly to papermaking fabrics for tissue production.

[0002]

2. Description of the Related Art A papermaking method is a well-known technique. First, a papermaking raw material containing pulp fibers and the like is formed endlessly from a head box, and is suspended between rolls of a papermaking machine. Supplied to The side to which the raw material of the papermaking fabric is supplied is the papermaking surface, and the opposite side is the running surface. The supplied raw material moves as the papermaking fabric travels, and during the movement, moisture is removed by a dewatering device such as a suction box or a foil installed on the traveling surface side of the fabric to form wet paper. That is, the papermaking fabric functions as a filter and separates pulp fibers and water. The wet paper web formed in the papermaking zone is then transferred to a press zone and a dryer zone. In the press zone, the wet paper web is transported by a papermaking felt and is squeezed together with the papermaking felt by a nip pressure between press rolls to further remove water. In the dryer zone,
The wet paper is transported by a papermaking canvas and dried to produce paper.

[0003] Papermaking fabrics are woven by a loom using warps and wefts such as synthetic resin monofilaments. To form an endless shape, it is formed endlessly by a known weaving seam, pin seam, or the like, or is formed endlessly at the stage of weaving by a bag weaving loom. In the case of bag weaving, the relationship between the warp and the weft is reversed between on the loom and during use. In this specification, a warp is a yarn extending in a machine direction of a papermaking machine, that is, a traveling direction of a woven fabric, and a weft is a yarn extending in a cross direction of a papermaking machine, that is, a width direction of a woven fabric.

By the way, in order to effectively improve the supportability of the fiber and to produce a high-quality paper without generating a wire mark on the paper, it is important that the fiber is preferably supported by a weft. . This is because the pulp fibers supplied from the head box onto the papermaking fabric are generally oriented in the machine direction, that is, the warp direction. By supporting the fibers by separating the dents between the warps with the weft, the fibers are prevented from staying between the warps. Further, in the papermaking fabric, a two-layer fabric in which the papermaking surface side fabric and the running surface side fabric are connected by a binding yarn is used. This is because it has an effect of being excellent in rigidity and capable of employing a woven fabric corresponding to the performance required for each of the papermaking surface side and the running surface side.

In recent years, two-layer fabrics have been used in papermaking fabrics for tissue production, and have been particularly successful in high-speed paper machines. Conventionally, as a papermaking fabric for tissue production, a single-layered fabric in which a weft forms a long crimp on a papermaking surface side has been mainly used. However, it has become possible to cope with the increasing mechanical load of increasingly faster paper machines. Although the single-layer woven fabric has advantages such as good drainage properties, disadvantages such as poor formation and poor retention caused by insufficient rigidity due to the woven structure were very large.
Therefore, two-layer fabrics with good rigidity and good retention have been tried, and they have met expectations and responded to the mechanical load of high-speed paper machines, greatly improving formation, improving smoothness, and improving retention. And so on. In the two-layer fabric described above, the running surface side fabric has a ridge weave in which two warps are aligned in parallel, with the aim of reducing the net thickness in order to secure drainage and small water retention. The type in which the binding yarn passes through the upper side of one papermaking surface side warp and then interweaves with the running surface side fabric downward is mainly used.

[0006] Although it has been successful as described above in terms of use in a papermaking company, it has the drawback that the productivity is low and the cost is high in the textile manufacturing process. The woven fabric for papermaking is usually used after being processed endlessly, but a special method called weaving is adopted in order to form the processed part equal to the ordinary part so that the mark of the endless processed part does not appear on the paper. . In the weaving process, the weft at both ends of the woven fabric is removed to create a warp-only portion, and the separately prepared warp is removed to form only the weft. It is processed endlessly by inserting and weaving the warp only part. In this weaving process, productivity was very poor.

[0007]

First, the present inventor studied why the productivity in the weaving process was reduced and found out where the cause was. Since the conventional two-layer fabric has the above-described configuration, there are two types of warp yarns on the paper-making side: a warp yarn having a binding yarn passing above and a warp yarn not passing above. In the weaving process, the weaving performance of the two types of warp with the weft is different, which causes a problem. That is, the setting of the warp yarn in which the binding yarn did not pass above was poor, and the weaving performance was very unstable. In view of the above problems, the present invention improves the productivity of the weaving process by adopting a configuration in which the binding yarn passes over all the papermaking surface side warps without adversely affecting other performances. And a papermaking fabric.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a papermaking side fabric comprising a papermaking side warp and a papermaking side weft; a running surface side fabric comprising a running surface side warp and a running surface side weft; A binding yarn connecting the papermaking surface side fabric and the running surface side fabric,
The paper-making side weft passes over the three continuous paper-making side warps, forms a long crimp on the paper-making side, and then passes under one paper-making side warp. In a two-layer woven fabric for papermaking, which is a plain woven structure of a ridge weave structure in which two warps are arranged in parallel in the same structure, a binding yarn passes above one papermaking surface side warp and then two papermaking surfaces. After passing between the warp and the running surface side warp, and then passing over one papermaking surface side warp and interweaving with the papermaking surface side fabric, passing between one papermaking surface side warp and the running surface side warp. Then, the repetition of a structure in which the yarn passes through the lower side of the running surface side warp which is arranged in two parallels and then passes between one papermaking surface side warp and the running surface side warp and interweaves with the running surface side fabric is used. A binding yarn, and the binding yarn is arranged so as to pass above all the papermaking surface side warps in the complete structure. Two-layer fabric for papermaking and wherein the door. "
It is about.

[0009] The papermaking side fabric of the papermaking fabric of the present invention has a structure in which the papermaking side weft passes above three continuous papermaking side warps and then passes below one papermaking side warp. A repeating twill or break twill weave structure. Since the papermaking surface side weft forms a long crimp for three continuous papermaking surface side warps, the fiber support of the weft is very good.

The running surface side fabric has a plain weave structure of a ridge weave in which a plurality of warps are arranged in the same structure, so that the net thickness can be reduced, and a large space is formed between the running surface side warps. Since it is formed, good drainage can be secured. Therefore, it is particularly suitable for a papermaking woven fabric for tissue production, which requires good drainage, low net pressure, and good fiber support of the weft because the fiber is oriented in the warp direction and the fiber length is long.

[0011] The binding yarn passes above one papermaking surface side warp, then passes between two papermaking surface side warps and the running surface side weft, and then passes over one papermaking surface side warp. After passing through and interweaving with the papermaking surface side fabric, it passes between one papermaking surface side warp and the traveling surface side weft, and then passes under two traveling surface side warps arranged in parallel, and then passes through one side. This is a repetition of a structure in which the paper passes between the papermaking surface side warp and the traveling surface side weft and interweaves with the traveling surface side fabric, and furthermore, this binding yarn is tied to the upper side of all papermaking surface side warps in a complete structure. Because the yarn is arranged so that it passes, all the paper-side warp yarns have the same conditions,
Problems in the weaving process are eliminated, and productivity is improved. Also,
Since the binding yarn is woven into all the papermaking surface side warps, the uniformity of the binding yarn being drawn into the papermaking surface is increased, and the surface property is also improved.

By the way, if the running surface side fabric has a ridge weave structure in which two warps are arranged in parallel, if the binding yarn and the running surface side warp are interwoven, the two are arranged in parallel. Weaving is performed under the running surface side warp. This is because, when the yarn passes through the other running surface side warp, for example, the lower side of one running surface side warp, the running surface side warp aligned at that portion is forcibly separated and the texture is disturbed. Therefore, the number of warps to be shifted when the binding yarns are shifted and arranged in the complete structure is determined to be an even number.
For this reason, conventionally, it was not possible to adopt a configuration in which the binding yarn passes above all the papermaking surface side warps. However, in the present invention, since the structure of the binding yarn is the above-described structure, it is possible to adopt a configuration in which the binding yarn passes above all the papermaking surface side warps. Details will be described in Examples.

[0013] In contrast, in the present invention, two paper warp yarns are woven with one papermaking surface warp, and in the present invention, two paper warp yarns are woven into the running surface side. The power becomes stronger. When the binding force is increased, the above-described binding yarn is rubbed between the papermaking surface side fabric and the running surface side fabric so that internal wear does not occur and a gap is generated between the fabrics or separated. The problem that it does not occur does not occur.

In the binding yarn of the present invention, the distance between the portion where the two binding yarns pass above the papermaking surface side warp and the portion where the binding yarn passes below the running surface side warp is one warp each. Since they are equal, the conditions under which the two binding yarns weave the warp on the papermaking side are the same, and the surface properties and the like are not adversely affected.

The density of the number of yarns with respect to the woven fabric on the paper-making side is not particularly limited.
/ 2 or 2/3. The yarn used in the present invention can be freely selected depending on the characteristics desired for the papermaking fabric, and is not particularly limited. For example, in addition to monofilament, multifilament, spun yarn, crimped or bulky textured yarn, bulky yarn, processed yarn generally called stretch yarn, mulled yarn, or twisting these Can be used. In addition, the cross-sectional shape of the yarn is not only a circle, but also a rectangular shape such as a square shape or a star shape, an elliptical shape,
A hollow thread or the like can be used. In addition, the material of the yarn can be freely selected, and polyester, nylon, polyphenylene sulfide, polyfluorovinylidene, 4fluoroethylene, polypro, aramid, polyetheretherketone, polyethylenenaphthalate, cotton, wool, metal, etc. are used. it can. Needless to say, a copolymer or a yarn in which various materials are blended or contained in these materials according to the purpose may be used.

Generally, it is preferable to use a polyester monofilament having rigidity and excellent dimensional stability for the papermaking side warp, the running side warp, and the papermaking side weft. Further, since the binding yarn is required to have a small wire diameter and exhibit shower resistance, fibrillation resistance, and abrasion resistance against the internal abrasion described above, it is preferable to use nylon monofilament. Further, the wear resistance can be improved while ensuring rigidity by interlacing polyester monofilaments and nylon monofilaments, for example, by alternately arranging polyester monofilaments and nylon monofilaments on the running surface side weft requiring wear resistance.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. 1 and 2 are design diagrams showing the complete structure of the embodiment of the present invention. The complete structure is the smallest repeating unit of the fabric structure, and the complete structure is connected vertically and horizontally to form the structure of the entire fabric. In the design drawings, the warp yarns are Arabic numerals, e.g.
The weft is indicated by Arabic numerals with dashes, for example, 1 ', 2', 3 '. In addition, the mark x indicates that the papermaking side warp is located above the papermaking side weft,
○ indicates that the running surface side warp is located below the running surface side weft, ▲ black square ▼ indicates that the binding yarn is located above the papermaking surface side warp, and The mark indicates that the binding yarn is located below the running surface side warp.

The warp and the weft on the papermaking surface side and the running surface side are arranged so as to be vertically overlapped. In the design drawing, the yarns are vertically overlapped with each other so that the warp on the papermaking side and the warp and the weft on the running surface are arranged immediately below the weft, but this is for the convenience of the drawing. In an actual woven fabric, it may be displaced.

Example 1 FIG. 1 is a design diagram showing a complete structure of Example 1 of the present invention. In the design drawing of FIG. 1, 1, 2, 3, 4, 5, 6,
Reference numerals 7 and 8 denote warps, in which the papermaking surface side warp and the running surface side warp are arranged vertically. 1 ', 2', 4 ', 5', 7 ',
8 ', 10', and 11 'are wefts, and the papermaking side wefts are arranged on the upper side, and the running surface side wefts are half-density below the papermaking side wefts 2', 5 ', 8', and 11 '. Are located.
3 ', 6', 9 ', 12' are binding yarns. According to the design drawing, the present embodiment is 1 in total with the papermaking side fabric and the running surface side fabric.
It can be seen that the fabric is a six-shaft fabric.

First, the papermaking side fabric is examined. For example, the papermaking side weft 1 'passes above the three papermaking side warps 1, 2, 3 and then the lower side of one papermaking side warp 4. , And then pass above the three papermaking side warps 5, 6, and 7, and then pass under one papermaking side warp 8, and over the three consecutive papermaking side warps It can be seen that the structure passing under one warp on the papermaking side after passing has been repeated twice, and the warp on the papermaking side has also passed through the lower side of three continuous wefts on the papermaking side. It can be seen that the structure passing above the papermaking surface side weft of the book is repeated twice. Since the long crimp for three warps on the papermaking side is formed on the papermaking side, the fiber support of the weft becomes good. The warp on the paper-making side is shifted upward by one weft on the paper-making side, and is sequentially arranged, indicating that it is a twill weave. In the design drawing, two complete structures of the four-shaft twill weave papermaking side fabric are arranged vertically and horizontally and a total of four are formed.

Looking at the running surface side fabric, the running surface side warps 1 and 2, 3 and 4, 5, 6 and 7 and 8 have a plain weave structure of a ridge weave in which the same structure is arranged. I understand. The net thickness can be reduced, and it is particularly suitable as a papermaking fabric for tissue production. However, the present invention is not limited to papermaking fabrics for tissue production. In an actual woven fabric, the running surface side warps 1 and 2 are closely arranged below the papermaking surface side warps 1 and 2. The advantage of the ridge weave structure is that compared to the case where one thick warp having a cross-sectional area of two is arranged, the net thickness is thinner because it is the same as the case where a flat cross-section yarn is used. There is a point formed in the weft wear type.

Looking at the binding yarns, for example, 3 'passes above the papermaking surface side warp 1, passes between the papermaking surface side warp 2 and the running surface side warp 2, and then is arranged in two parallel. Of the running surface side warps 3, 4, and then between the papermaking surface side warp 5 and the running surface side warp 5, then above the papermaking surface side warp 6, and then on the papermaking surface side warp 6. It passes between 7,8 and the running surface side warp 7,8. Considering the papermaking surface side warp 6, this structure passes above one papermaking surface side warp, then passes between two papermaking surface side warps and running surface side warp, and then one papermaking surface warp. After passing through the upper side of the side warp and interweaving with the papermaking side fabric, it passes between one papermaking side warp and the running side warp, and then the lower side of the running side warp which is arranged in two parallel. , And then passed between one papermaking surface side warp and the running surface side warp and interwoven with the running surface side fabric. The binding yarns 3 'are sequentially shifted to the right by two warps, and the binding yarns 6', 9 ', and 12' are arranged, and the binding yarn passes over all the papermaking surface side warps. I understand that there is. In addition, it can be understood that the binding yarns have the same structure in which all the binding yarns are simply displaced.

As described above, when the binding yarns are sequentially shifted, the number of warps to be shifted is naturally determined as an even number by the structure of the running surface side fabric.
A binding yarn passing above one papermaking surface side warp at one place cannot pass a binding yarn above all the papermaking surface side warps. For example, even if the binding yarns passing above the papermaking surface side warp 1 are arranged in even numbers, the papermaking surface side warp that can pass through the upper side is the odd numbered papermaking surface side warp and the even numbered yarn. The upper side of the warp on the papermaking side cannot be passed. This can be achieved by arranging binding yarns of different textures, but the conditions under which the binding yarn passes above the papermaking surface side warp naturally differ, and the binding yarns differ in the force and direction in which the papermaking surface side warp is woven. This adversely affects the surface properties and the uniformity of the state of overlap between the warp on the papermaking side and the warp on the running side.

According to the present invention, the binding yarns are odd-numbered and even-numbered binding surfaces such that the binding yarn 3 'of this embodiment passes above the papermaking surface side warp 1 and the papermaking surface side warp 6. Since the yarn passes over the side warp, even if the binding yarns having the same structure are displaced by an even number of warp yarns, it is possible to pass the upper side of all the papermaking surface side warps. The distance between the portion passing above the papermaking surface side warp 1 and the papermaking surface side warp 6 and the portion passing below the running surface side warps 3 and 4 is 1 for warp 2 and warp 5, respectively. Since they are the same, the conditions under which the binding yarn 3 'weaves both the papermaking surface side warp 1 and the papermaking surface side warp 6 become the same, and the surface properties and the like are not adversely affected. As described above, the conditions under which the binding yarn weaves the warp on the papermaking side are all the same, so that the surface properties and the uniformity of the overlapping state of the warp on the papermaking side and the warp on the running side can be ensured.

Example 2 FIG. 2 is a design diagram showing a complete structure of Example 2 of the present invention. In the present embodiment, the layout of the papermaking-side fabric and the configuration of the running surface-side fabric are the same as those in the first embodiment. The relationship between the yarn and the code is also the same, and in this embodiment, the way of overlapping the papermaking side fabric and the running surface side fabric and the way of weaving the binding yarn to the papermaking side fabric are different.

[0026]

According to the double-layer woven fabric for papermaking of the present invention, since the binding yarn passes above all the papermaking surface side warps under the same conditions, the interweavability of the warp and the weft in the weaving process is uniform. Productivity is improved. Further, since all the papermaking surface side warps are woven by the binding yarn under the same conditions, the uniformity of the binding yarn being drawn into the papermaking surface is increased, and the surface property is improved. Further, since the number of times that the binding yarn is woven by the papermaking surface side warp is increased, the binding strength is improved, and an excellent effect of eliminating the problem of internal wear is exhibited.

[Brief description of the drawings]

FIG. 1 is a design diagram showing a complete structure of Example 1 of the present invention.

FIG. 2 is a design diagram showing a complete structure of Example 2 of the present invention.

[Explanation of symbols]

1,2,3,4,5,6,7,8 Warp 1 ', 2', 4 ', 5', 7 ', 8', 10 ', 11'
Weft 3 ', 6', 9 ', 12' Auxiliary weft

Claims (1)

[Claims] 1. A papermaking side fabric comprising a papermaking side warp and a papermaking side weft; a running side fabric comprising a running side warp and a running side weft; a papermaking side fabric; and a running side fabric. And a binding yarn for connecting the papermaking surface side weft to the continuous
A long crimp is formed on the papermaking surface side through the upper side of the papermaking surface side warp of the book, and then the repetition of the structure passing under one papermaking surface side warp is repeated, so that two traveling surface side warps have the same structure in parallel. In the two-layer woven fabric for papermaking, which is a plain weave structure of the arranged ridge weave structure, the binding yarn passes above one papermaking surface side warp and then passes between the two papermaking surface side warps and the running surface side warp. After passing through the upper side of one papermaking side warp and interweaving with the papermaking side fabric, it passes between one papermaking side warp and running side warp, and then is arranged in two parallel. A binding yarn which is a repetition of a structure which passes under the running surface side warp and then passes between one papermaking surface side warp and the running surface side warp and interweaves with the running surface side fabric; and A double layer for papermaking, characterized in that the binding yarn is arranged so as to pass over all the papermaking side warps in the complete structure. Thing.