JPS6257996A - Double fabric for papermaking - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-ply fabric for paper manufacturing, and particularly to a double-ply fabric for paper layer forming part.
Concerning heavy textiles.

The well-known double woven fabric that has been used in papermaking machines in recent years is a woven fabric with a warp-heavy weft double structure, and generally consists of a pair of upper and lower wefts, a pair of upper and lower wefts, and a warp interwoven with each other. It is formed of.

Generally, in order to improve the wire marks on paper, it is considered to increase the density of the warp and weft, and for this purpose, it is necessary to reduce the diameter of the warp and weft. However, the well-known double weave currently in use has the contradictory problem that reducing the diameter reduces abrasion resistance, and conversely increasing the diameter to increase abrasion resistance reduces wire mark properties. .

In order to solve the above-mentioned problem, Japanese Patent Application Laid-open No. 12892/1982, Japanese Patent Publication No. 42116/1982, and 18496/1982
Although there have been attempts to create new titles, none of them were fully satisfactory.

Namely, JP-A-55-12892, JP-A-59-4211.
In order to solve the above-mentioned problems, No. 6 etc., two or five layers of fabric each composed of different sets of warp and weft are arranged on the paper forming surface and the wire wear surface, and these two or six layers are arranged. It had a structure in which the woven fabric was bound using separate binding weft or binding warp threads.

However, in these structural fabrics, the binding yarn generates an irregular pattern on the paper layer forming surface that is different from the original pattern of the fabric on the paper layer forming surface, which causes wire marks.

JP-A-58-18496 was proposed as the next improvement method. In this method, the paper layer forming side fabric and the worn side fabric are interconnected by vertical pairs of threads, and these pairs of threads are repeated so as to form the texture pattern of the paper layer forming side.
In addition, the paper layer forming surface fabric and the wear surface fabric are woven alternately. However, from a technical and practical point of view, 5
The problem is that different types of warp threads have to be used υ Warp systems of this type must differ with respect to the dimensions of the fermented threads and the density of the warp threads. Also, during the fabrication process, a difference (tension) occurs between the paired warp and the other warp that makes up the paper layer forming surface, and this occurs at the weft forming point of the warp that makes up the paper layer forming surface and the warp that makes up the pair. It has the disadvantage of producing a pattern different from the original pattern created by the warp and weft, which causes wire marks.

The object of the present invention is to provide a double-ply fabric for paper making that eliminates these problems. That is, the present invention provides an upper layer weft 2: a lower layer weft 3 arranged below the upper layer weft 2 and forming a pair with at least a part of the upper layer weft 2; and a first upper layer interwoven with the upper layer weft 2 in a plain fiber structure. A second upper layer warp 1b interwoven with the first upper layer warp 1a and the upper layer weft 2 at a predetermined number ratio, wherein the second upper layer warp 1b passes under three successive upper layer wefts 2. , and then interwoven with a predetermined number of upper layer wefts 2 to form a plain weave structure.The second upper layer warp 1b is woven with the upper layer weft 2 by repeating the cycle of interweaving with a predetermined number of upper layer wefts 2; Below weft 2,
Passing between the first weft 2 and the second weft 2, above the second weft 2, between the second weft 2 and the third weft 2, and under the third weft 2, The connection between the first weft 2 and the second weft 2 under the first weft 2 of the six upper wefts 2 that extend diagonally downward and pass under the lower layer weft 5, then diagonally upward and continue again. By repeating the cycle of passing over the second weft 2, between the second weft 2 and the third weft 2, and under the third weft 2, the upper layer weft 2 and the lower layer weft 3 and a third warp 4 joining together; an upper knuckle formed by the third warp 4 on the second upper layer weft 2 cooperates with an upper knuckle of the second upper layer warp 1b to form a plain weave pattern. As a result, the upper knuckle of the first upper layer warp 1a, the upper knuckle of the second upper layer warp 1b, and the upper knuckle of the third warp 4 cooperate to form a substantially plain weave pattern on the paper layer forming side. The above objectives are achieved by means of a double-ply fabric for papermaking.

According to the present invention, it is possible to increase the number density of the paper layer forming side weft yarns compared to the number density of the worn side weft yarns, and the wire mark property and the smoothness of the paper layer forming surface can be significantly improved. Since the woven structure allows the paper layer forming surface to be formed without impairing the original woven pattern of the layer forming surface, this woven fabric has a weaving pattern that is much improved compared to the structural fabric of the prior art.

In addition, the diameter of the worn side weft is 1.05 to 1.0 times the diameter of the upper layer yarn.
It is a fabric that is 8 times larger in diameter and is also blended with highly abrasion-resistant materials such as polyamide to provide wear resistance, making it significantly more abrasion resistant than conventional, well-known fabrics. .

Next, embodiments of the present invention will be described using the drawings.

FIG. 3 is a longitudinal sectional view showing the first embodiment of the present invention, and FIGS. 1 and 2 are the shapes of the weaving patterns on the paper layer forming side and the wear side of the fabric according to the embodiment of FIG. 3. In the first embodiment, the paper layer forming side substantially has a plain weave pattern, and the worn side has a four-heddle satin weave pattern. The first upper layer warp 1a and the upper layer weft 2 alternately cross each other to form a plain weave, and the second upper layer warp 1b and weft 2 normally cross alternately to form a plain weave, but the third warp 4 and the upper layer weft 2 form a plain weave. After the second upper layer warp 1b passes under three successive upper layer wefts 2 at the weaving point on the paper layer forming surface with the weft 2, the second upper layer warp 1b is weaved so as not to damage the plain weave pattern on the paper layer forming side. , which intersects the upper layer weft 2 again. In other words, the third
The warp knuckle pattern at the weaving point formed by the warp 4 and the upper weft 2, the warp knuckle pattern formed by the second upper layer warp 1b and the upper layer weft 2, and the warp knuckle pattern formed by the first upper layer warp 1a and the weft 2, This substantially constitutes a plain weave pattern which is the original weave pattern of the layer forming surface.

As described above, since the present invention is a structural fabric in which the knuckle patterns of the weft and warp yarns forming the paper layer forming surface are regularly constructed on substantially the same plane, irregular wire marks like those of conventional double-layer fabrics can be removed from the paper. This shall not occur. Furthermore, by making the number density of the lower layer wefts coarser than the number density of the upper layer wefts, there is an advantage that the water resistance is improved. Further, by making the lower layer weft thicker, there is an advantage that the wear volume of the weft until the fabric breaks is increased, and the useful life of the weft is increased.

In the embodiment described above, when the third warp 4 passes under the lower weft 3, it is woven with only 301 wefts, resulting in a weft wear type structure with a large number of wefts arranged on the wear surface. The result is a fabric with improved abrasion resistance.

Since the present invention has the above-mentioned configuration, it solves the drawbacks of the prior art as described above, and provides a fabric that can significantly improve the smoothness of the paper layer forming surface and the characteristics of wire marks, and has wear resistance. be.

The material of the thread constituting the present invention is not particularly limited, but preferably monofilament of polyester or polyamide can be used.

In addition, wear-resistant synthetic fibers such as polyamide, such as 610 nylon, 66 nylon, 6 nylon, 612 nylon, etc., can be used for all or part of the wear-resistant side wefts, and polyester monofilament, which is difficult to stretch, can be used as the warp.

4. Brief explanation of drawings FIG. 1 is a top plan view showing an embodiment of the present invention.

FIG. 2 is a bottom plan view of the net of FIG. 1;

FIG. 3 is a sectional view taken along line 5-3 in FIG. 1 in the direction of the arrow.

FIG. 4 is a perspective view of an embodiment of the invention.

1a...First upper layer warp 1b... Second upper layer warp 2・・・・・・・・・Upper layer weft 3.--Lower weft ４・・・・・・・・・Third warp

Claims (1)

[Claims] 1. Upper layer weft 2; Lower layer weft 3 arranged below upper layer weft 2 and forming a pair with at least a part of upper layer weft 2; Interwoven with upper layer weft 2 into a plain weave structure 1st upper layer warp 1
a; a second upper layer warp 1b interwoven with the first upper layer warp 1a and the upper layer weft 2 at a predetermined number ratio, the second upper layer warp 1b passing under three successive upper layer wefts 2; Next, the second upper layer warp 1b is woven with the upper layer weft 2 by repeating the cycle of interweaving with a predetermined number of upper layer wefts 2 into a plain weave structure; the first weft of the three successive upper layer wefts 2; Under 2,
It passes between the first weft 2 and the second weft 2, over the second weft 2, between the second weft 2 and the third weft 2, and under the third weft 2, and diagonally. Extends downward and passes under the lower layer weft 3, then extends diagonally upward, and continues again under the first weft 2 of the three upper layer wefts 2, between the first weft 2 and the second weft 2 , over the second weft 2, between the second weft 2 and the third weft 2, and under the fifth weft 2. By repeating this cycle, the upper weft 2 and the lower weft 3 are a third warp 4 to be combined; an upper knuckle formed by the third warp 4 on the second upper layer weft 2 cooperates with an upper knuckle of the second upper layer warp 1b to form a plain weave pattern; As a result, the upper knuckle of the first upper layer warp 1a, the upper knuckle of the second upper layer warp 1b, and the upper knuckle of the third warp 4 cooperate to substantially form a plain weave pattern on the paper layer forming side. Double woven fabric for paper making. 2. The double-ply fabric for papermaking according to claim 1, wherein the number density of the upper layer weft yarns 2 is greater than the number density of the lower layer weft yarns 3. 3. The second upper layer weft 2 forms a vertical pair with the lower layer weft 3, the first upper layer warp 1a and the second upper layer warp 1b are alternately arranged every other warp, and the third warp 4 is the upper layer weft. 2, it is located almost directly below the second upper layer warp 1b, but above the upper layer weft 2, it is located at a position slightly shifted from directly above the second upper layer warp 1b, and the number density of the upper layer weft 2 is higher than that of the lower layer weft 3. The number density is twice as high as the number density, and the pitch interval in the longitudinal direction of the upper knuckles of the third warp threads 4 is equal to the pitch interval in the longitudinal direction of the lower knuckles of the third warp threads 4. double-ply fabric for paper making. 4. The double woven fabric for papermaking according to any one of claims 1 to 3, wherein the diameter of the lower layer weft 3 is larger than the diameter of the upper layer weft 2. 5. The diameter of the lower layer weft 3 is 1.05 to 1.05 of the diameter of the upper layer weft 2.
The double-ply fabric for papermaking according to claim 4, which is within the range of 1.8 times. 6. Claim 1, wherein the third warp crosses only one of the lower wefts 3 when passing under the lower weft 3, and then extends obliquely onto the upper weft 2. ~5th
The double-ply fabric for papermaking according to any one of the above items.