JPH01250489A - Double woven fabric for paper making - Google Patents

Abstract

PURPOSE:To eliminate concentrated sink of weft yarns on the surface and prevent wire marks from occurring, by pushing up each weft yarn in an upper layer at a regular interval in two places, evenly distributing and arranging pushed up places in a complete structure. CONSTITUTION:Weft yarns in a number of (n-1)X2 (n is an even number of <=6) are arranged in the upper layer (a), (b)... and the lower layer (A), (B)... and the first warp yarn 1 in (n-1)X2 warp yarns 1, 2... is passed over the first weft yarn (a) in the upper layer, then under the (n-2) weft yarns (b), (c)... in the upper layer, over the n-th weft yarn (f) in the upper layer, between the weft yarn (f) and the next adjacent weft yarn (g), under a weft yarn (H) in the lower layer and under a weft yarn (j) in the upper layer of (n-1)X2 counted from the first weft yarn (a). The respective warp yarns are subsequently shifted by n weft yarns and similarly arranged. Each warp yarn and the n-th warp yarn counted therefrom are arranged as follows. If either of the warp yarn is passed and arranged under a weft yarn in the lower layer of an even number counted from the first weft yarn, the other warp yarn is passed and arranged under a weft yarn in the lower layer of a mutually different odd number counted from the first warp yarn to form a complete structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double woven fabric for paper making having a double warp-main weft structure.

[Prior Art] In recent years, multi-woven paper fabrics have been used in paper making machines to improve the abrasion resistance and dimensional stability of paper fabrics. For example, it is a fabric with a warp-heavy weft double structure, which is made up of weft yarns arranged in two layers, upper and lower, and warp yarns interwoven with the weft yarns. (For example, Japanese Patent Publication No. 49-62706, Japanese Patent Publication No. 58-48
(See Publication No. 679, etc.). In these conventional double-woven fabrics for papermaking, the upper and lower double wefts are sufficiently bent, the wefts have abrasion resistance, and the warps are hardly bent, so they do not stretch during use and have dimensional stability. is also excellent, but it is not satisfactory as many wire marks occur.

[Problems to be Solved by the Present Invention] In paper-making fabrics, wire marks that occur on the paper surface are always a problem.

Wire marks occur due to many reasons, such as uneven water repellency of paper fibers and surface irregularities.

However, since it is an A product, it is difficult to avoid bending of the yarn due to the placement of warp and warp yarns, and uneven portions are inevitably generated on the surface.

This problem also occurs in the various multi-woven fabrics that have good effects in terms of abrasion resistance and posture stability, which is a major problem. The present invention provides a papermaking fabric with a novel structure that solves the problem of wire mark generation.

[Means for Solving the Problems] The present invention provides rA, (n-1) x 2 (n is an even number or less of 6 or more)
Wefts are arranged in two layers, upper and lower, and the first one of the (n-1) ) After passing under the weft of the upper layer of the book, passing over the weft of the upper layer of the n main book opening counting from the first weft, then passing between this weft and the next adjacent weft, and then passing under the weft of the lower layer. After threading, count from the first weft (n-1)X2 and place it under the upper weft of the main entrance. The warp and the n-th warp (where n is the number set at the beginning) counting from the first weft are placed under the lower weft of a different number, counting from the first weft, if one is an even number, the other is an odd number. ``Double-layered silk material for paper making having a complete structure formed by

In the papermaking fabric of the present invention, the number of warp and weft is (n-1)
It has a complete Mi weave formed by setting the specific number of X2 (n is a number of 6 or more) and arranging the warp and weft in a special arrangement as described above.

This special structure is only possible in a fabric with a complete structure in which this number of warps and wefts are arranged in this way, so that the weft threads of the upper layer that form the surface of the fabric are always superior to those above it in the perfect structure. It is pushed upward by the passing warp threads and the opening of the warp threads, and is also pushed upward by the lower warp threads in three places, which prevents the weft threads from sinking downward on the surface of the fabric and distributes these pushing up points evenly. This is because the weft yarns do not sink intensively below the surface, and the formation of large depressions that cause wire marks can be prevented. Without the structure of the present invention, the weft threads would be concentrated in some areas where they are pushed up, and the weft threads would sink downward from the surface and form large recesses in other locations where they are not pushed up, and wire marks would inevitably occur. Only the special configuration of the present invention can prevent the occurrence of wire marks due to sinking of the weft threads.

In the present invention, by passing the warp threads under the weft threads of the lower layer, the weft threads of the upper and lower layers are placed on the warp threads, forming a warp-main weft double fabric. By specifying the position where the weft threads of the lower layer pass under, the weft threads of the upper layer are pushed upward at three locations without fail, resulting in a complete structure in which the pushed-up locations are evenly distributed, and the weft threads of the lower layer that are not penetrated by the warp threads are created. The weft threads disappear. In other words, each warp passes under the odd or even numbered lower weft counting from the first weft, but the nth (where n is the number you set at the beginning) counting from that warp is an even number, and the odd number is the first warp. It passes under the th weft that is opposite to .

In this way, in a complete braid that is completed by specifying the position where the warp passes under the lower layer weft, the upper layer weft is always pushed up at three locations. In addition, the push-up points are evenly distributed, and there are no lower layer wefts that are not woven into the fabric.

The number of weft yarns in the lower layer through which the warp yarns pass under the underside is not limited to - as long as the above requirements are met; for example, it is possible to repeatedly pass the underside of multiple odd-numbered weft yarns, or You can also pass the thread under it repeatedly.

[Operations] Next, the present invention will be explained in detail, referring to the surface structure of the paper-making fabric and the generation of wire marks.

Papermaking fabrics are also woven fabrics, so the interweaving of warp and weft yarns is naturally acidified. Therefore, it is inevitable that knuckles of warp and weft yarns are formed on the surface of the fabric, resulting in unevenness.

As a result of researching the irregularities formed on the surface of textiles, the present inventors found that there is a problem with the Vi structure on the surface of textiles, especially the arrangement of weft yarns.

In other words, the fact that the weft yarns on the surface of the paper-making fabric are arranged in a downwardly depressed state between almost perpendicular warp yarns without bending has a major influence on the occurrence of wire marks. It became clear that there was.

In textiles, the surface weft threads are pushed upward by the underlying warp threads. However, in a fabric with a strong structure such as a papermaking fabric, the place where the warp on the lower side has the effect of pushing up the weft on the upper layer is slightly adjacent to the weft of the warp that extends above the weft on the upper layer. This is only the part below the weft, and the other parts of the warp do not have any pushing up action even if they are placed under the weft of the upper layer.

Therefore, all of the weft threads between the warp threads, except for the above-mentioned weft threads, sink downward, forming a large recess. In recent years, in order to improve fiber support and reduce knuckles, the surface of paper-making fabrics has been formed with a large number of weft yarns, which has caused more and more warp yarns to cave in, resulting in many large depressions on the fabric surface. formed, resulting in many wire marks.

It has a complete structure formed by arranging the warp threads in a special arrangement. Due to this structure, each weft thread is always pushed upward by the lower warp thread at three points. In other words, as is clear from the complete structure, each warp thread regularly emerges above the upper weft thread in three places. The warp that emerges above this weft goes under the weft next to that weft and pushes this weft upward.

Therefore, since every weft thread is always tied at three locations, the locations where the warp threads overlap the weft threads are regularly staggered. As a result, the part where the weft is pushed upward is
7' for each weft: also regular for the fabric;
evenly distributed.

In this way, the weft threads do not sink downward from the surface in a concentrated manner, and the occurrence of wire marks is prevented.

"Example] Examples will be described with reference to the drawings.

In Figure 1, there are 10 warps and 110 wefts each on the top and bottom (
FIG. 2 is a plan view of a papermaking fabric of the present invention formed with n=6). FIG. 2 is a cross-sectional view of the fabric shown in FIG. 1 taken at the knee 2, and FIG. 3 is a cross-sectional view of the fabric shown in FIG. 1 taken along line n-n'. FIG. 4 is a complete design diagram showing the complete structure of the fabric.

In Figures 1 to 3, it can be seen that the weft yarns are arranged in two layers, upper and lower. The first warp 1 passes over the first weft a of the upper layer, and the next adjacent upper layer b,
It passes under the four wefts c, d, and e. Then, it passes over the sixth upper layer weft f counting from the first weft a, then passes between this weft f and the next weft g, and then the lower layer weft H
It passes under the weft yarn j of the upper layer and is placed under the weft yarn j of the upper layer. The next warp thread 2 passes under the weft thread a of the first upper layer, passes over the next weft thread thread, then passes under the next weft thread C, then passes under the weft thread E of the lower layer, and then passes under the weft thread E of the lower layer. It passes over the seventh upper layer weft g counting from the weft a, and then passes under the three upper layer wefts i and j adjacent to this weft.

Looking at the arrangement of these two warp threads, it can be seen that the warp thread 2 is arranged with a shift of six upper weft threads from the warp thread 1 in the complete structure. Similarly, the warps 3 to 10 are sequentially arranged with six wefts at a time. The 10 wefts A to J arranged in the lower layer are woven by the warp passing below them, but the wefts of the lower layer under which the warp passes are
As is clear from FIGS. 1 to 4, each warp is specified as follows.

As shown in Figures 1 to 4, the lower layer weft through which the first warp 1 passes is the eighth weft l (counting from the first weft).
It is. The weft of the lower layer under which the sixth warp 6 counting from the warp 1 passes is the ninth weft I counting from the first weft A.

In other words, the 1st and 6th, the 2nd and 7th, the 3rd and 8th.
The main, 4th and 9th, 5th and 100th warps are
It passes under the lower layer wefts, where the even and odd numbers, counting from the first weft, are reversed.

When the first warp passes under the odd-numbered lower weft, the nth (where n is an even number set at the beginning, 6 or more) warp then passes under the even-numbered weft.

Of course, the opposite is also possible. By arranging the warp threads in this way, the complete II h"fg shown in Figure 4 is completed, and the upper layer weft threads are always pushed upward at three locations, and there are no lower layer weft threads that are not woven into the fabric. That is understood.

Next, if we look at the points where the warp has the effect of pushing up the weft in the upper layer, as is clear from Figure 2, the weft thread e in the upper layer is pushed upward by the warp 1, but the weft threads c and d are not pushed up. do not have.

The warp thread 1 does not exert a pushing effect on the weft threads C and d. The weft g of the upper layer is the warp 1 and the lower weft H
Because it passes under, it goes downwards, so it cannot be pushed upwards.

FIG. 4 clearly explains the structure of the warp-main weft double fabric shown in FIG. 1, which has such a structure.

In Figure 4, X indicates the location where the warp is above the weft of the upper layer, Δ indicates the location where the warp is below the weft of the lower layer, and the position of △ is shifted by one between warp 1 and warp 6. , you can see that the odd and even numbers of the lower wefts passing underneath are reversed, counting from the first weft.

In FIG. 4, O indicates a location where the weft threads of the upper layer are pushed upward by the warp threads below.

Further, the weft yarn a of the upper layer is pushed upward by the warp yarns 2 and 7. Similarly, the weft threads are pushed upward by warp threads 1 and 6. In this way, each weft thread is pushed up every five warp threads, and the locations where the weft threads are pushed up are uniform. As is clear from FIG. 4, in the complete structure, the locations where the wefts are pushed up are evenly distributed.

Therefore, in the double-woven fabric for paper making shown in FIGS. 1 to 4 having this perfect structure, the wefts of the upper layer do not sink intensively from the surface of the fabric, and the generation of wire marks is prevented.

In Figure 5, there are 14 warp threads and 14 weft threads at the upper and lower corners (n=8
) shows the complete structure of the papermaking fabric of the present invention formed by
This is a complete design drawing. 6 and 7 show cross-sections of the fabric of FIG. 5, similar to FIGS. 2 and 3.

As is clear from Fig. 5, the weft threads of each upper layer are pushed upward by the warp threads at three locations, and the push-up interval is also 7.
It can be seen that the distance is constant, and that the pushed-up points are evenly distributed in the complete tissue.

Next, from FIGS. 5 and 6, it can be seen that in the fabric shown in this embodiment, there are three locations where each warp passes under the weft of the lower layer. That is, the first warp 1 passes under the 10th and 12th even-numbered lower wefts J and L counting from the first weft A, but the 8th warp 8 passes under the first weft A.
It can be seen that the 11th and 13th odd-numbered lower wefts, counting from the beginning, pass under M, and the even-numbered and odd-numbered wefts are reversed. A warp may pass under any number of lower wefts as long as the requirement that the even and odd numbers of the lower wefts that each warp and the n-th warp pass under are reversed is satisfied.

There are 18 examples (n=
This is a paper-making fabric with a warp-main weft double structure in which 10> warp threads and 18 upper and lower girder weft threads are arranged.

Further, the embodiment shown in the complete design drawing of FIG. 9 is a papermaking fabric with a double warp-main weft structure in which 22 warps (n=12) and 22 wefts each on the upper and lower sides are arranged.

As is clear from FIGS. 8 and 9, in each of the textiles, the wefts of the upper layer are pushed upward at three locations at equal intervals. It can also be seen that in the complete Mi weave, the push-up points are evenly distributed.

Also, regarding the position where the warp passes under the weft of the lower layer, the first warp and the n-th warp are odd-numbered and even-numbered, and there are no wefts that are not woven into the weft.

[Effects] As described above, in the warp-main weft double warp-main weft papermaking double paper-making product according to the present invention, each weft of the upper layer is always pushed upward at three equally spaced positions, and furthermore,
In a completely braided yarn, the push-up points are always evenly distributed, there is no sinking on the concentrated surface of the warp yarns, and the generation of wire marks is prevented. Furthermore, since the surface of the woven fabric is mostly made up of weft yarns, the fibers are supported well, the paper strength is improved, and the yield is also very good. The warp yarns extend almost vertically and have good stability in posture, and since the drag surface is formed by the lower layer weft yarns, the wear resistance is extremely excellent and provides excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the papermaking fabric of the present invention, which is composed of six warp threads and six upper and lower weft threads. FIG. 2 is a cross-sectional view of the fabric in FIG. 1 taken along I-I, and FIG. 3 is the same (n-n
FIG. FIG. 4 is a complete design drawing of FIG. Fig. 5 is a complete design drawing of the papermaking fabric of the present invention, which is composed of 14 warp threads and 14 upper and lower weft threads, Fig. 6 is a sectional view taken along the warp threads, and Fig. 7 is a cross-sectional view taken along the weft threads. It is a cut sectional view. Figure 8 shows the warp and weft yarns each having 18 threads, and Figure 9 the warp and weft threads each having 22 threads for paper making of the present invention! It is a complete design drawing of one thing. 1-22...warp, a-V...upper layer weft, A-■
... Lower layer weft Figure 1 Millet Figure 2 L 231+-+67? l? +011 +7-(31
1t'Figure 7Figure 8

Claims (1)

[Claims] 1, A, (n-1) x 2 (n is equal to or greater than 6 and an even number or less) weft yarns are arranged in upper and lower two layers, and (n-1) x 2 warp yarns are arranged in upper and lower layers. Pass the first warp thread over the first weft thread in the upper layer, then pass it under the next adjacent (n-2) weft threads in the upper layer, then pass it through the nth weft thread counting from the first weft thread. Pass it over the weft of the upper layer, then pass it between this weft and the next adjacent weft, then pass it under the weft of the lower layer, and count from the first weft (n-1) x the second weft of the upper layer. B, each warp and weft n (however, n is the initially set 6
(even numbers above) and arrange them in the same way, C. Each warp thread is arranged in the same manner as that warp thread and the n-th warp thread (counting from that one) (where n is the number set at the beginning), counting from the first weft thread. A double woven fabric for papermaking having a complete structure formed by passing under different numbered lower layer wefts, one of which is even numbered and the other of which is odd numbered.