JP2001288612A - Woven fabric for making paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woven fabric for making paper having excellent abrasion resistance and excellent smoothness in the woven fabric layer on the paper-making face by coupling the woven fabric layer on the paper-making face side with the woven fabric layer for the running face side without using any jointing and connecting yarn. SOLUTION: In the woven fabric layer for making paper 1A according to this invention, the woven fabric layer on the paper-making face side is constituted with the plane woven fabric with the first weft 21 and the first warp 31, while a part of the second warp 32 that is not woven into the second weft 22 is woven into the first weft to form the jointing and binding part 6 whereby the woven fabric layer 4 on the paper-making face side and the woven fabric layer 5 on the running face side are connected into the vertically doublelayered woven fabric. The count of the woven yarns into complete texture is 20 in the first weft and 10 in the second weft 22 where the ratio of them is 2:1. In other words, the woven fabric layer on the paper-making face side has close texture, while the fabric layer 5 on the running face side has rough texture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking fabric, and more particularly, to a papermaking surface side fabric layer and a running surface side fabric layer without using a binding yarn, and to provide abrasion resistance and papermaking. The present invention relates to a papermaking woven fabric excellent in the smoothness of a surface side woven fabric layer and the stock support.

[0002]

2. Description of the Related Art Conventionally, in the papermaking process, a wet web which has been dehydrated by a wire part is received and carried to a press part, and water is further squeezed through press rolls. For sending, papermaking fabrics are used. Today, in order to respond to the demand for improved production efficiency by improving the quality of paper and increasing the speed of papermaking, paper with excellent surface properties by improving smoothness and stock support as papermaking fabrics. Development of a papermaking fabric that can be efficiently produced and has excellent properties in strength has been promoted.

[0003] In order to improve the smoothness and the stock support of the papermaking fabric, it is preferable that the fabric layer on the papermaking side is woven in a flat structure. Therefore, there is a problem in terms of abrasion resistance because the warp is immediately worn. Therefore, conventionally, the papermaking surface side fabric layer 4 has a flat structure to improve smoothness and stock support, and the running surface side fabric layer 5 has an abrasion-resistant structure. A two-layer papermaking fabric to be connected is used (see FIG. 6). However, in the case of the upper and lower two-layer fabrics connected by such a binding yarn, at a place where the binding yarn and the warp or weft of the papermaking surface side fabric intersect, the binding yarn moves the papermaking surface side fabric layer to the running surface side. Because of the drawing, a dent is generated on the surface of the paper-making side fabric layer, and the smoothness of the paper-making side fabric layer is reduced, which may be generated as a wire mark on the surface of the paper to be formed. Further, there is also a problem that the life of the papermaking fabric is shortened due to the internal wear of the binding yarn, and the weaving is complicated.

In order to improve the drawbacks when using such binding yarns, the development of a two-layer papermaking woven fabric that does not use binding yarns has been studied. A papermaking woven fabric having a warp double weft double structure in which the upper and lower two layers are connected by the papermaking surface side weft has been proposed (Japanese Patent Application Laid-Open No. Hei 9 (1994)).
-95889 gazette). However, when the papermaking side fabric layer and the running surface side fabric layer are connected with the papermaking side weft as a binding yarn, the flat structure of the papermaking side fabric layer is impaired and the smoothness of the papermaking side fabric layer is reduced. There is a possibility that. Further, in the case of the papermaking fabric disclosed in Japanese Patent Application Laid-Open No. 9-95889, a papermaking surface side weft knuckle is formed at every three papermaking surface side warps on both papermaking surface side wefts. At the center of the warp and at the position of the warp next to the knuckle of the running surface side warp.
The force and angle at which the papermaking side weft knuckle is drawn into the running surface side are kept the same to prevent the smoothness of the papermaking side fabric layer from being impaired.In this case, the number of wefts and warps and the weaving pattern are reduced. There is a problem of being limited.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is intended to bond a papermaking-side fabric layer and a running-surface-side fabric layer without using a binding yarn, and to provide wear resistance. An object of the present invention is to provide a papermaking woven fabric having excellent properties, smoothness of a woven layer on the papermaking side, and excellent stock support.

[0006]

Means for Solving the Problems In order to achieve the above object, the present inventors have made intensive studies on the structure of the papermaking fabric, the relationship between the weaving pattern of the warp and weft, and the properties of the papermaking fabric. Instead of connecting the papermaking side fabric layer and the running surface side fabric layer with the weft forming the fabric layer, but connecting the two layers with the warp constituting the running surface side fabric layer, the above object can be achieved. The inventors have found and completed the present invention.

[0007] The papermaking fabric of the first invention comprises a papermaking side fabric layer composed of a first weft and a first warp, and a running surface side fabric layer composed of a second weft and a second warp. In the papermaking woven fabric, the first weft and the first warp are woven in a flat structure, and the second warp is formed by weaving the first weft of the woven fabric layer on the papermaking surface. It is characterized by having.

In the first aspect of the present invention, the "flat structure" means that the first warp 31 is woven so as to be below the first weft 21 as shown in FIG. It refers to a structure formed by weaving so as to come over one weft 21.
With the above-described configuration, the smoothness of the papermaking surface side fabric layer is improved, and the warp is firmly entangled with the structure, so that the restraint of the weft can be strengthened. It is preferable because the strength can be improved. In the present invention, the “flat structure” usually means that the first warp 31 is completely woven so as to be below the first weft 21 as shown in FIG. It is formed by weaving so as to come over the first weft 21, but as shown in FIG.
After weaving so that the warp 31 comes on the first weft 21,
The first warp 31 may be woven so as to completely come under the first weft 21, and may be woven so that the first warp 31 completely comes under the first weft 21. It need not be formed by weaving to come.

In the first invention, the "joining portion" is a knuckle portion formed by interweaving a warp and a weft, particularly by interweaving a second warp and a first weft. Knuckle part. The papermaking fabric layer of the first invention connects the papermaking surface side fabric layer and the running surface side fabric layer by having the “joining portion”.

As shown in FIG. 1, the papermaking fabric of the first invention comprises a papermaking side fabric layer in which a first weft and a first warp are woven in a flat structure, and a second weft and a second warp. The constructed running surface side fabric layer connects the upper and lower layers without using a binding yarn separately. Therefore, it is possible to improve the smoothness and paper stock support of the papermaking surface fabric layer and to improve the abrasion resistance of the running surface fabric layer without using a binding yarn. Further, in the papermaking fabric of the first invention, since the upper and lower two layers are connected by using a portion of the second warp which has not been used for weaving, the number of warps and wefts and the weaving are included. The pattern is not particularly limited, and can be various patterns as necessary.

The "running surface side fabric layer" is a single-layer type composed of the second weft and the second warp in the case of the first invention, but as shown in the second invention, the second weft is Alternatively, a multi-layer running surface side fabric layer composed of the n-th weft and the second warp (n ≧ 3) can be provided (see FIG. 5). With such a multilayer structure, as shown in FIG. 5, even if the number of wefts constituting the running surface side fabric layer is the same as that of the papermaking fabric of FIGS. As a rough structure, a papermaking fabric excellent in dewatering performance can be obtained, which is preferable.

In the papermaking fabric of the present invention, the number of the second warps woven so as to form a binding portion with the first weft of the above-mentioned papermaking fabric layer in the complete structure is not particularly limited. Preferably, at least half or more of the second warp is woven so as to form a binding portion with the first weft of the papermaking surface fabric layer. For example, as shown in the third aspect of the present invention, all the second warps in the complete design can be woven so as to form a binding portion with the first weft of the papermaking surface fabric layer (FIG. 3).
reference). Further, as shown in the fourth aspect of the present invention, the second warp in the complete design can be woven so as to form a connection portion with the first weft of the papermaking fabric layer every other in the complete design ( 2 and 4). With this configuration, the adhesiveness between the papermaking surface side fabric layer and the running surface side fabric layer is slightly reduced as compared with the papermaking fabric of the third invention.
As a result of the net thickness being reduced, the smoothness of the woven fabric layer on the paper control side is improved, which is preferable.

In the papermaking fabric of the present invention, there is no particular limitation on the interval between a knuckle portion formed by weaving a warp and a weft and a portion (crimp) protruding between adjacent knuckle portions. However, as shown in the fifth invention, the lowermost weft of the running surface side fabric layer may have a crimp interval of four second warps on the running surface side (see FIG. 1). This configuration is preferable because the crimps for four warps are provided on the running surface side, so that the abrasion resistance can be improved. The “lowest weft” in the fifth aspect of the present invention refers to the weft located closest to the running surface, that is, the second weft when the running surface side fabric layer is composed of the second weft and the second warp. In the case where it is composed of the second to n-th wefts and the second warp (n ≧ 3), the n-th weft is shown.

In the papermaking fabric of the present invention, the ratio of the number of wefts included in the first weft and the running surface side fabric layer in the complete structure is not limited, and may be various values as required. For example, as shown in the sixth aspect of the present invention, the ratio of the number of wefts in the first weft and the running surface side fabric layer can be (1-2): 1. When the number of wefts on the papermaking side is larger than the number of wefts on the running side, the papermaking side can have a denser structure and the running side can have a sparser structure. In addition to improving the properties, the moisture of the stock can be efficiently dehydrated. Further, Japanese Patent Application Laid-Open No. 9-9 / 1990
In the papermaking fabric described in Japanese Patent No. 5889, while the upper and lower two layers are connected by using the papermaking surface side weft, two adjacent layers are used.
Since the paper-making side weft knuckles of the paper-making side wefts cooperate to form a plain weave structure with one warp interposed on the paper-making side, at least two wefts constituting the paper-making side fabric layer are formed. It is necessary and the ratio of the number of wefts on the papermaking side and the running side is limited to 2: 1. On the other hand, the papermaking fabric of the present invention is not the papermaking side weft but the Since two warp yarns are used, the ratio of the number of weft yarns on the papermaking side and that on the running surface side is not limited to 2: 1. It is preferable to set the number to be included (less than 2) to 1 in particular, since the running surface side fabric layer can have a relatively dense structure, and thereby the abrasion resistance can be improved. In the sixth aspect of the present invention, the number of threads of the “running surface side weft” indicates the number of threads of the second weft when the running surface side fabric layer is composed of the second weft and the second warp, When it is composed of the second to n-th wefts and the second warp (n ≧ 3), it indicates the total number of the second to n-th wefts.

In the papermaking fabric of the present invention, the number of warp yarns constituting the complete design is not particularly limited, but usually, as shown in the seventh invention, the total of the first warp yarn and the second warp yarn is used. 14, 16, 18, or 20 constitute a complete tissue. When 14, 16, 18, or 20, the crimp interval of the lowermost weft of the running surface side fabric layer can be variously adjusted as needed, and the life of the papermaking fabric layer can be adjusted. Is preferred. Further, in the papermaking fabric of the present invention, the wire diameter of each of the above-mentioned warp and each of the above-mentioned wefts is not particularly limited.
It is 0.35 mm, preferably 0.15 to 0.30 mm, and more preferably 0.15 to 0.25 mm. By setting the thickness in such a range, it is possible to prevent the network thickness from becoming unnecessarily large and to obtain a structure having an appropriate amount of voids.

In the papermaking fabric of the present invention, the arrangement of the second to nth wefts (n ≧ 3) forming the running surface side fabric layer is not particularly limited, and each weft is arranged in the vertical direction. Each weft may be woven so that each weft is shifted from the immediately above weft by 0.1 to 1 in the longitudinal direction. By weaving each weft with a slight offset with respect to the immediately above weft and consciously breaking the multilayer structure of the running surface side fabric layer, the mesh thickness of the papermaking fabric does not become unnecessarily thick. Is preferable.

The material of the warp and the weft constituting the papermaking fabric of the present invention is not limited. For example, polyester monofilament, nylon monofilament (6 nylon, 66 nylon, 610 nylon, 612 nylon)
Nylon, etc.) can be used. In this case, the warp and the weft may be made of a single material, or may be made of two or more materials having different materials for each warp or weft.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The papermaking fabric of the present invention will be specifically described below with reference to examples. (1) Structure of Papermaking Fabrics FIGS. 1 to 5 show complete design drawings and vertical cross-sectional schematic views of the papermaking fabrics 1A to 1E of the present embodiment. (A) of FIG. 1 to FIG.
BRIEF DESCRIPTION OF THE DRAWINGS It is a complete design figure which shows the textiles 1A-1E for papermaking of a present Example. Numbers 1 to 20 in the figure indicate warp numbers. That is, the papermaking fabrics 1A to 1E of the present example show that 20 warps form a complete structure. Of the above numbers, odd numbers indicate the first warp 31 and even numbers indicate the second warp 32. In FIG. 1A to FIG. 5A, the square cells are the first weft 21, the second weft 22, and the third weft 2.
3 (FIG. 5 only). Further, in FIGS. 1 to 5A, the crosses indicate that the first warp 31 and the second warp 32 are the first weft 2
1, the second weft 22, and the third weft 23 (FIG. 5 only). For example, in the complete design diagram of FIG. 1A, in a square cell indicating the second weft yarn 22,
Second warp (even number warp) constituting the running surface side fabric layer
Since there are four squares successively followed by four x marks at the location of, there is a square cell with one non-mark, so the second weft yarn 22 has crimps for four warps in the running surface side fabric layer. It indicates that.

FIGS. 1 to 5B are schematic longitudinal sectional views of the papermaking fabrics 1A to 1E of the present embodiment. That is, (b) of FIGS. 1 to 4 is a longitudinal sectional view of a portion corresponding to warp numbers 1 to 3 in the complete design diagram of (a) of FIGS. 1 to 4. 5B is a longitudinal sectional view of a portion corresponding to warp numbers 1 to 4 in the complete design diagram of FIG. 5A. In each of the papermaking fabrics 1A to 1E of the present embodiment, the first weft 21 and the first warp 31 are woven in a flat structure to constitute the papermaking fabric layer 4, and the second warp 32 is formed of the papermaking fabric. The first weft 21 of the layer 4 is woven to form the joint portion 6, and connects the papermaking fabric layer 4 and the running surface side fabric layer 5.

The papermaking fabric 1 of the present embodiment shown in FIGS.
The first weft 21 constituting A to 1G is made of polyester and has a diameter of 0.17 mm, the second weft 22 is made of polyester and has a diameter of 0.25 mm, and the third weft 23 (FIG. 5 only).
Is made of nylon and has a diameter of 0.25 mm. On the other hand, the first warp 31 is made of polyester and has a diameter of 0.17 mm, and the second warp 32 is made of polyester and has a diameter of 0.20 mm.

As shown in FIG. 1 (b), the papermaking fabric 1A of FIG. 1 has a first weft 21 and a first
1 is woven in a flat structure. In addition, a part of a portion of the second warp 32 that is not woven with the second weft 22 is woven into the first weft 21 to form the binding portion 6, so that the second warp 32 runs with the papermaking surface side fabric layer 4. It is an upper and lower two-layer fabric connecting the surface side fabric layer 5. The number of threads in the complete weave is 20 for the first weft 21 and 10 for the second weft 22, and the ratio between the two is 2: 1. That is, the papermaking side fabric layer 4
Has a dense structure, and the running surface side fabric layer 5 has a sparse structure. Thereby, the smoothness and the supportability of the stock can be improved on the papermaking side, and the stock can be efficiently dewatered on the running side. Further, as shown in FIG. 1A, the second weft 22 has a crimp equivalent to four warps on the running surface side, and thus has excellent wear resistance.

The papermaking fabric 1B shown in FIG. 2 has a total number of ten first weft yarns 21 and ten second weft yarns 22 in a complete structure, and the ratio between them is 1: 1. Thereby, the running surface side fabric layer is relatively dense, and the second weft 22 has crimps for four warps on the running surface side, similarly to the papermaking fabric 1A of FIG. 1 is superior in abrasion resistance to the papermaking fabric 1A of FIG.

The papermaking fabric 1C shown in FIG. 3 has the number of first wefts 21 of 1 in the complete structure, similar to the papermaking fabric 1B shown in FIG.
0, and the number of the second wefts 22 is 10, and the ratio between them is 1: 1.
It is. On the other hand, in the papermaking fabric 1B of FIG. 2 described above, of the ten second weft yarns 22, the connecting portion 6 is formed by half of the five second weft yarns, whereas every other one is formed. In the papermaking fabric 1 </ b> C of FIG. 3, the binding portions 6 are formed by all the second wefts 22. Thereby, the adhesiveness between the papermaking surface side fabric layer 4 and the running surface side fabric layer 5 can be improved. Also, as in the papermaking fabric 1B of FIG. 2, the running surface side fabric layer is relatively dense, and the second weft 22 has crimps for four warps on the running surface side. It is excellent in abrasion resistance as compared with the papermaking fabric 1A of FIG.

As shown in FIGS. 4 (a) and 4 (b), the papermaking fabric 1D of FIG. 4 has the numbers 3, 7, 11, 15 and 19.
The first warp 21 has a configuration that is not woven under the first weft 21 in the binding portion 6. With this configuration, it is possible to alleviate a slight depression of the papermaking surface side fabric layer 4 generated at the joint portion and improve the smoothness of the papermaking surface side fabric layer 4.

The papermaking fabric 1E shown in FIG. 5 has a total number of ten first weft yarns 21, five second weft yarns 22, and five third weft yarns 23 in the complete structure. The layer 5 has a double structure composed of the second weft 22, the third weft 23, and the second warp 32. Then, half of the second warp yarns 32 weave the first weft 21 in one place to form the binding portion 6, and the rest weave the second weft 22 and the third weft 23 in one place to form the knuckle portion. This is a papermaking fabric having a weft triple warp double structure in which the papermaking surface side fabric layer 4 and the running surface side fabric layer 5 are joined together. In the papermaking fabric 1E of FIG. 5, the running surface side fabric layer 5 has a double structure, and the running surface side fabric layer 5 is relatively rough as compared with the papermaking fabric 1B of FIG. , A papermaking fabric with excellent dewatering performance.

It should be noted that the present invention is not limited to the specific embodiments described above, but can be variously modified according to the purpose and application.

[0027]

The woven fabric for papermaking of the present invention does not use a binding yarn, and is not the first weft or the first warp constituting the woven layer on the papermaking side, but the warp constituting the woven layer on the running surface side. Thus, the papermaking surface fabric layer and the running surface fabric layer are connected. As a result, compared to conventional papermaking fabrics, the smoothness of the papermaking surface layer of the papermaking side fabric layer and the excellent paper stock support, and the number of weft and warp threads and the weaving pattern are changed to various types. And a papermaking fabric having a high degree of freedom.

[Brief description of the drawings]

FIG. 1 is a complete design diagram (a) of a papermaking fabric 1A of the present embodiment.
And a schematic longitudinal sectional view (b).

FIG. 2 is a complete design diagram (a) of the papermaking fabric 1B of the present embodiment.
And a schematic longitudinal sectional view (b).

FIG. 3 is a complete design diagram (a) of a papermaking fabric 1C of the present embodiment.
And a schematic longitudinal sectional view (b).

FIG. 4 is a complete design diagram (a) of the papermaking fabric 1D of the present embodiment.
And a schematic longitudinal sectional view (b).

FIG. 5 is a complete design diagram (a) of the papermaking fabric 1E of the present embodiment.
And a schematic longitudinal sectional view (b).

FIG. 6 is a schematic longitudinal sectional view of a conventional papermaking fabric.

[Explanation of symbols]

1A, 1B, 1C, 1D, 1E; woven fabric for papermaking, 21; first weft, 22; second weft, 23; third weft, 31;
Warp yarns, 32; second warp yarns, 4; paper surface side fabric layer, 5; running surface side fabric layer, 6; binding portion, 7; binding yarn.

Claims (7)

[Claims] 1. A papermaking fabric comprising: a papermaking side fabric layer composed of a first weft and a first warp; and a running surface side fabric layer composed of a second weft and a second warp. The first weft and the first warp are woven in a flat structure, and the second warp has a binding portion formed by weaving the first weft of the papermaking surface fabric layer. Papermaking fabric. 2. A papermaking fabric comprising: a papermaking surface side fabric layer composed of a first weft and a first warp; and a traveling surface side fabric layer composed of a second weft to an nth weft and a second warp. Wherein (n ≧ 3), the papermaking woven fabric layer is formed by weaving the first weft and the first warp in a flat structure, and the second warp woven with the first weft of the papermaking woven fabric layer. A papermaking woven fabric having a binding portion to be formed. 3. The papermaking machine according to claim 1, wherein all of the second warps forming the running surface side fabric layer in a complete structure form a binding portion with the first weft of the papermaking surface fabric layer. For textiles. 4. The paper warp fabric layer according to claim 1, wherein every other second warp forming the running surface fabric layer in a complete design forms a binding portion with the first weft of the papermaking fabric layer. Papermaking fabric. 5. The papermaking fabric according to claim 1, wherein the lowermost weft of the running surface side fabric layer has a crimp for four second warps on the running surface side. 6. The paper-making two-layer fabric according to claim 1, wherein the ratio of the number of wefts in the first weft and the running surface side fabric layer is (1-2): 1. 7. The papermaking fabric according to claim 1, wherein the total number of the first warp and the second warp in the complete structure is m (m: 14, 16, 18, or 20). .