JP2001098483A - Double layer fabric for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double layer fabric for papermaking capable of reducing internal friction and preventing abrasion and breaking of binding yarns by improving degree of adhesion between fabrics of papermaking side and running side without influencing surface properties of paper produced by papermaking. SOLUTION: The double layer fabric 1 for papermaking of this invention comprises a fabric layer 2 of papermaking face side made of polyester monofilaments woven by using a warp yarn 21 on the papermaking face side and a weft yarn 22 on the papermaking face side, a running face side fabric layer 3 woven by using a warp yarn 31 on the running face side made of the polyester monofilaments and a weft yarn 32 on the running face side made of alternately blended polyester monofilaments with nylon monofilaments in the number ratio of 1:1 and binding yarns 4. The two layers are integrated to be one body by mutually binding the aforesaid woven layer 2 on the papermaking face side with the woven fabric 3 on the running face side which are complete tissue fabrics. The diameter of the aforesaid binding yarn 4 is 86-120% of that of the weft yarn 32 on the papermaking face side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer woven fabric for papermaking, and more particularly, to a method of adhering a woven layer on a papermaking side and a woven layer on a running side without affecting the surface properties of paper to be made. While improving the degree, reducing the internal wear of both layers,
The present invention relates to a two-layer papermaking woven fabric that can prevent abrasion and cutting of a binding yarn.

[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 to be formed and increasing the speed of papermaking, it is possible to produce paper with excellent surface properties by preventing the occurrence of wire marks as a papermaking fabric. ,
It is required that the high-quality paper M / C or the like have properties that have both abrasion resistance and resistance to abrasion caused by a filler such as calcium carbonate. In this case, in order to improve the surface properties of the paper to be formed, it is conceivable to increase the paper layer supporting point by increasing the density by reducing the yarn diameter of the warp or weft constituting the papermaking fabric. Alternatively, when the diameter of the weft yarn is reduced, there is a contradictory problem that wear resistance is reduced.

Conventionally, in order to solve this problem, a structure has been proposed in which a two-layer woven fabric composed of a set of a warp and a weft is combined with a different binding yarn for a paper forming surface and a wire wear surface, respectively. (Japanese Patent Laid-Open No. 55-12892, Japanese Patent Publication No.
42116). However, even during use of these structural fabrics, the binding yarns cause friction with the fabric yarns,
There are also many problems that the binding yarn is worn and cut, and the upper and lower fabric layers are peeled off. In order to eliminate this defect, a thick binding yarn is used, but when a thick binding yarn is used, the original pattern of the upper layer fabric differs from the original pattern at the weaving point with the upper layer fabric. There is a problem that a pattern is generated and causes a wire mark. In order to solve the above problems, as the binding yarn, a polyamide monofilament having abrasion resistance is used, and the diameter of the binding yarn is 65 to 85% of the diameter of the upper layer weft. A two-layer papermaking woven fabric capable of preventing the generation of wire marks has been proposed (Japanese Patent Publication No. 63-50472).

[0004] However, in order to meet the recent demand for improving the papermaking efficiency by increasing the papermaking speed, it is preferable to use a binding yarn having a large diameter in order to improve the wear resistance of the papermaking fabric. Further, in the above-described two-layer woven fabric for papermaking having two warp layers and two weft yarn layers, the lower side of the woven layer on the papermaking side and the upper side of the woven layer on the running side are rubbed with each other, causing internal abrasion. There is a problem that the drainage of paper decreases and the dewaterability of wet paper decreases. The cause of such internal abrasion is due to poor adhesion between the papermaking surface side fabric layer and the running surface side fabric layer.Therefore, in order to improve the papermaking efficiency, the binding yarn must be used in the papermaking fabric. It is necessary not only to improve the abrasion resistance, but also to improve the adhesion between the papermaking surface side fabric layer and the running surface side fabric layer to reduce internal friction.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it has been proposed that a paper-making-side fabric layer and a running-face-side fabric layer be formed without affecting the surface properties of paper to be made. It is an object of the present invention to provide a two-layer papermaking woven fabric capable of improving the degree of adhesion, reducing internal wear of both layers, and preventing abrasion and cutting of a binding yarn.

[0006]

The present inventors have studied the materials and diameters of the warps, wefts and binding yarns constituting the papermaking fabric, and as a result, conventionally, the papermaking was performed while preventing the generation of wire marks. In order to improve the surface properties of paper, the binding yarn with a small diameter was used, but even if a binding yarn with a large diameter was used,
The present inventors have found that it is possible to improve the surface properties of the paper to be made and also to improve the abrasion resistance, thereby completing the present invention. That is, the two-layer papermaking woven fabric of the first invention is woven from a papermaking surface side woven layer made of a papermaking surface side warp and a papermaking surface side weft, and a running surface side warp and a running surface side weft. A running surface side fabric layer, and a binding yarn for binding the papermaking surface side fabric layer and the traveling surface side fabric layer, wherein the diameter of the binding yarn is the papermaking surface side weft. 86 to 120% of the diameter of

The diameter of the "binding yarn" is 86 to 120%, usually 86 to 110%, of the diameter of the papermaking side weft.
Preferably 86 to 100%, more preferably 86 to 96%
%, Most preferably 88-96%. If the diameter of the "binding yarn" is less than 86% of the diameter of the papermaking surface side weft, the abrasion resistance of the binding yarn decreases, and the durability of the papermaking two-layer fabric deteriorates. If it exceeds 120%, the smoothness of the surface of the woven fabric layer on the papermaking side is impaired, and the surface properties of the paper to be formed are undesirably reduced.

[0008] As described above, when a binding yarn having a large diameter, particularly a binding yarn having a larger diameter of 100 to 120% of the diameter of the weft on the paper-making side, is used, the binding yarn is formed on the paper-making surface. If it protrudes, the smoothness of the surface of the woven fabric layer on the paper-making side is reduced, which may cause generation of wire marks. In order to prevent this, it is preferable that the tension of the warp on the papermaking side during weaving is relatively relaxed. Thus, the tensioned binding yarn pushes down the loosely woven papermaking surface side warp, thereby ensuring the smoothness of the papermaking surface side fabric layer surface.

The material of the above "binding yarn" is not particularly limited. For example, polyester monofilament, polyurethane monofilament, nylon monofilament (6 nylon, 66 nylon, 610 nylon, 61 nylon)
2 nylon etc.) can be used. Of these, a nylon monofilament is particularly preferred.

The diameter and unit of the "papermaking surface side warp", "papermaking surface side weft", "running surface side warp" and "running surface side weft" constituting the double-layered papermaking fabric of the first invention. The ratio of the number of yarns per length is not limited, and may be various values as needed. For example, the yarn diameter of the papermaking surface side warp is 5 to 25% smaller than the yarn diameter of the running surface side warp, the papermaking surface side weft is 20 to 50% thinner than the running surface side weft,
The number of yarns per unit length of the papermaking surface side warp and the papermaking surface side weft is defined as 1 of the number of the running surface side warp and the running surface side weft.
It can be 20 to 220%. This makes it possible to increase the number of supporting points of the paper layer in the fabric layer on the paper-making side, thereby avoiding the occurrence of wire marks, and to increase the internal friction and running by using a large-diameter fabric layer in the running surface. It is excellent in abrasion resistance against surface side friction and can further improve the life of the papermaking fabric.

The material of the above-mentioned "papermaking side warp", "papermaking side weft", "running side warp" and "running side weft" constituting the two-layer woven fabric for papermaking of the first invention is not limited. For example, polyester monofilament, polyurethane monofilament, nylon monofilament (6
Nylon, 66 nylon, 610 nylon, 612 nylon, etc.) can be used. In this case, the above “papermaking side warp”, “papermaking side weft”, “running side warp” and “running side weft” are composed of one of the above materials and two types. The above configuration can be adopted. For example, as shown in the second invention,
Polyester monofilament and nylon monofilament are used as the running surface side weft, and the number ratio between the polyester monofilament and nylon monofilament can be 1: 2 to 2: 1, preferably 1: 1. If the ratio is more than 2: 1, the wear resistance is undesirably reduced. On the other hand, if the ratio is less than 1: 2, the morphological stability becomes insufficient and local wear is liable to occur.

Further, all of the above "papermaking surface side warp", "papermaking surface side weft", "running surface side warp" and "running surface side weft" may be made of the same material, Can also be used. In particular, as shown in the second aspect of the invention, the papermaking surface side warp and the papermaking surface side weft are woven in a flat structure using polyester monofilaments, and the traveling surface side warps are polyester monofilaments. When the polyester monofilament and the nylon monofilament are used and the number ratio of the polyester monofilament and the nylon monofilament is set to 1: 2 to 2: 1, poor adhesion between the papermaking side fabric layer and the running surface side fabric layer which causes internal abrasion is reduced. It is preferable because it can be further improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the two-layered papermaking fabric of the present invention will be specifically described with reference to examples. (1) Structure of double-layer woven fabric for papermaking The double-layer woven fabric for papermaking of Examples 1 to 3 is shown in FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the two-layer papermaking fabric 1 according to the first to third embodiments includes a papermaking side fabric layer 2 and a running surface side fabric layer 3. And the papermaking side fabric layer 2 is
The papermaking surface side warp 21 and the papermaking surface side weft 22 form a flat structure, and the running surface side fabric layer 3 forms a 4/1 collapsed weave structure by the running surface side warp 31 and the running surface side weft 32. ing. Then, the complete fabrics of the papermaking side fabric layer 2 and the running surface side fabric layer 3 are joined to each other using the binding yarn 4 to form a two-layer integrated papermaking two-layer fabric 1. The papermaking surface side warp 21, the papermaking surface side weft 22, and the running surface side warp 31 are polyester monofilaments. The running surface side weft 32 is a combination of polyester monofilament and nylon monofilament. It is mixed so that it becomes. The binding yarn 4 is made of nylon.

Examples 1 to 3 wherein the diameter of the papermaking side weft and the diameter of the binding yarn were as follows. [Example 1] Diameter of running surface side warp: 0.27 mm Diameter of running surface side weft: 0.35 mm Diameter of papermaking surface side warp: 0.25 mm Diameter of papermaking surface side weft: 0.25 mm Diameter of binding yarn : 0.22 mm (8 of the diameter of the weft on the papermaking side)
[Example 2] Diameter of running surface side warp: 0.25 mm Diameter of running surface side weft: 0.35 mm Diameter of papermaking surface side warp: 0.20 mm Diameter of papermaking surface side weft: 0.20 mm Yarn diameter: 0.18 mm (9 of the diameter of the weft on the papermaking side)
[Example 3] Diameter of running surface side warp: 0.20 mm Diameter of running surface side weft: 0.30 mm Diameter of papermaking surface side warp: 0.17 mm Diameter of papermaking surface side weft: 0.17 mm Yarn diameter: 0.15 mm (8 of the diameter of the weft on the papermaking side)
9%)

(2) Evaluation of the performance of the two-layer woven fabric for papermaking The papermaking was performed using the two-layer woven fabric for papermaking of Examples 1 to 3 above.
Was. As a comparative example, the diameter of the papermaking side weft is 0.25 m
m, the diameter of the binding yarn is 0.20 mm (the diameter of the weft yarn on the papermaking side)
(80%) of the papermaking two-layer fabric. So
As a result, the production speed was 700 m / min.
The life of the double-layered paper fabric is 86 days in the comparative example,
In Example 1, it was 103 days. In addition, the papermaking speed 850
The life of a two-layer papermaking woven fabric on a core-making machine with m / min
97 days in the comparative example, 113 days in the second embodiment.
became. In addition, senmitsu paper making machine with a paper making speed of 480m / min.
The life of a two-layer papermaking woven fabric is 71 days in the comparative example.
On the other hand, in Example 3, it was 88 days. The above results
In the two-layer papermaking fabrics of Examples 1 to 3,
The life of the papermaking double-layer fabric is 1.
16 to 1.23 times as long as the paper making of Examples 1 to 3
The two-layer fabric for paper is more abrasion-resistant than the two-layer fabric for papermaking.
It can be seen that the abrasion resistance is excellent and the durability is improved.

The present invention is not limited to the specific embodiments described above, but can be variously modified within the scope of the present invention according to the purpose and application. The structure of the papermaking side fabric layer and the running surface side fabric layer fabric can be changed in various ways, and the combination of the papermaking side fabric layer fabric and the running surface side fabric layer fabric can be freely selected. it can.
Furthermore, in order to improve the surface properties of the paper to be made and to improve the abrasion resistance, a yarn having a cross section of an elliptical shape or a similar oval shape is used as the warp yarn on the papermaking side or the running surface side. Can be.

[0017]

The double-layer woven fabric for papermaking according to the first invention has a diameter of the binding yarn of 86 to 120 of the diameter of the weft on the papermaking side, contrary to the prior art in which a binding yarn having a small diameter is used. %, And by using a binding yarn having a relatively large diameter, the degree of adhesion between the papermaking side fabric layer and the running surface side fabric layer is improved without affecting the surface properties of the paper to be formed. The internal wear of both layers can be reduced, and the abrasion and cutting of the binding yarn can be prevented. As a result, while improving the quality of the paper being made,
The production efficiency can be improved by increasing the speed of the paper making.
Particularly, as in the two-layered papermaking fabric of the second invention, the papermaking surface side warp and the papermaking surface side weft are polyester monofilaments and are woven in a flat structure, and the traveling surface side warp is a polyester monofilament. By making the face side weft a filament having a number ratio of polyester monofilament to nylon monofilament of 1: 2 to 2: 1, poor adhesion between the upper and lower fabric layers which causes internal abrasion can be further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a two-layer papermaking woven fabric of the present embodiment.

FIG. 2 is a cross-sectional view of the double-layer papermaking fabric of FIG. 1 taken along the line AA ′.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Two-layered papermaking fabric, 2; Papermaking side fabric layer, 21; Papermaking side warp, 22; Papermaking side weft, 3;
31: running surface side warp, 32: running surface side weft, 4: binding yarn.

Claims (2)

[Claims] 1. A papermaking side textile layer woven from a papermaking side warp and a papermaking side weft, a traveling side textile layer woven from a traveling side warp and a traveling side weft, and papermaking. In a two-layer woven fabric for papermaking, comprising a surface side fabric layer and a binding yarn for binding the running surface side fabric layer, the diameter of the binding yarn is 86 to 120% of the diameter of the papermaking surface side weft. A two-layer woven fabric for papermaking. 2. The papermaking surface side warp and the papermaking surface side weft are polyester monofilaments and are woven in a flat structure, the traveling surface side warp is a polyester monofilament, and the traveling surface side weft is a polyester monofilament and nylon. The two-layer woven fabric for papermaking according to claim 1, which is a monofilament, and the ratio of the number of the polyester monofilament to the number of the nylon monofilament is 1: 2 to 2: 1.