JP2628181B2 - Double woven fabric for papermaking - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a double woven fabric for papermaking, having a double warp / single weft structure.

[Related Art] In recent years, in papermaking machines, multi-woven papermaking fabrics have been used in order to improve abrasion resistance and dimensional stability of the papermaking fabrics. For example, a woven fabric having a warp single weft double structure and the like, which is formed by a weft arranged in upper and lower two layers and a warp woven with the weft. (See, for example, JP-A-49-62706 and JP-B-58-48679). In these conventional double woven fabrics for papermaking, the upper and lower double wefts are sufficiently bent, the wefts are responsible for abrasion resistance, and the warp is hardly bent, so it does not stretch during use and has excellent dimensional stability. However, the generation of wire marks is not satisfactory.

[Problem to be Solved by the Present Invention] In a papermaking fabric, a problem that always occurs is a wire mark generated on the surface of the paper.

The wire mark is generated due to a number of causes such as unevenness of the aqueous property of the papermaking fabric and unevenness of the surface.

However, since it is a woven fabric, it is difficult to avoid bending of the yarn due to weaving of the yarns of the course, and irregularities always occur on the surface.

This problem also occurs in various multi-woven fabrics that have a good effect on the abrasion resistance and posture stability described above, and is a serious problem.

The present invention is to provide a papermaking woven fabric having a novel structure that has solved the problem of the generation of wire marks, which could not be solved conventionally.

[Means for Solving the Problems] The present invention provides: (A-1) (n-1) × 2 (where n is an even number equal to or greater than 6) arranging in two upper and lower layers; × The first one of the two warps passes over the first one of the upper wefts and then passes under the next adjacent (n-2) upper wefts and then the first one. (N-1) × 2 counting from the first weft after passing over the nth upper weft, counting from the weft, passing between this next weft and the next adjacent weft, then passing under the lower weft B. The following warp yarns are arranged under the upper layer of the weft yarns. B. Hereinafter, each warp yarn is n (where n is an even number of 6 or more initially set). C Each warp yarn is counted from the warp yarn and n (where n is the first. The number of warps in the lower layer, counting from the first weft, if one is even, the other is odd, Having a complete design formed by disposing through under relates double fabric "papermaking.

In the papermaking fabric of the present invention, the number of warps and wefts is (n-
1) It has a specific number of 2 (n is 6 or more), and has a complete design formed by specially arranging warps and wefts as described above.

This special configuration is adopted only in a woven fabric having a complete design in which this number of warps and wefts is arranged in this way, the upper layer weft forming the surface of the woven fabric must be overlaid in the complete design. It is pushed upward between the passing warp and the warp, and is always pushed upward by the lower warp at two points, preventing the weft from sinking down on the woven fabric surface and dispersing the pushing points uniformly. This is because intensive sinking below the surface of the weft does not occur, and the formation of a large recess that generates a wire mark can be prevented. If the configuration of the present invention is lacking, the position where the weft is pushed up is partially concentrated, and at other places where the weft is not pushed up, all of the weft sinks downward from the surface to form a large recess, and a wire mark is always generated. Only with the special configuration of the present invention, the generation of the wire mark due to the sinking of the weft can be prevented.

In the present invention, by passing the warp under the lower weft, the upper and lower two layers of the weft are woven by the warp to form a warp single weft double woven fabric. By specifying a position passing below the upper layer, the upper layer weft is necessarily pushed upward at two places, and the push-up points are uniformly distributed and arranged, so that the lower layer weft not woven by the warp is eliminated. That is, each warp passes under odd or even-numbered lower wefts counted from the first weft, and the n-th (where n is the first set number) warp counted from the warp is even and odd is the earlier warp. It passes under the second weft, which is the opposite of In this way, the upper layer of the weft is always pushed up at two points in the complete design completed by specifying the position passing under the lower layer of the weft. Further, the push-up portions are evenly distributed and arranged, and no lower-layer weft that is not woven is not generated.

The number of lower-layer wefts through which the warp passes under the lower side is not limited to one as long as the above requirements are satisfied.For example, the lower side of a plurality of odd-numbered wefts can be repeatedly passed, and even-numbered Can be repeated under the thread.

[Operation] Next, the operation of the present invention will be described with reference to the surface structure of the papermaking fabric and the generation of wire marks.

Since the woven fabric for papermaking is also a woven fabric, the warp and weft are naturally woven. Therefore, it is unavoidable that knuckles of the warp and the weft are formed on the surface of the woven fabric and that irregularities are generated.

The present inventors have studied the irregularities formed on the surface of the woven fabric and found that there is a problem in the structure of the surface of the woven fabric, particularly in the arrangement of the wefts.

In other words, the fact that the weft yarn is hardly bent at the surface portion of the papermaking fabric and is sunk downward between substantially vertical warp yarns has a great effect on the generation of wire marks. It was elucidated.

In a woven fabric, the surface weft is pushed up by the warp underneath. However, in a woven fabric having a strong structure such as a papermaking fabric, the portion where the lower warp has the effect of pushing up the upper weft is slightly adjacent to the warp that comes out above the upper weft. Only the portion below the weft yarn, and the other warp portions do not exert any lifting action even if they are arranged below the upper weft yarn.

Therefore, all of the plurality of wefts between the warps except for the above-described wefts sink downward, and large recesses are formed here. In recent years, the surface of the papermaking fabric is formed so that there are many wefts to improve fiber supportability and reduce knuckles. Formed, resulting in many wire marks.

In the papermaking fabric of the present invention, the number of wefts and warps is (n-
1) x2 (n is an even number of 6 or more)
It has a complete structure formed by arranging warps in a special arrangement. With this structure, every weft is always pushed upward by the lower warp at two places. That is, as is clear from the complete design, each warp always emerges at two places regularly on the upper weft. The warp yarn on the weft enters the lower side of the weft next to the weft and pushes the weft upward. Therefore, every weft is always pushed upward by the lower warp at two places and at a constant interval.

Since the warp yarns are sequentially shifted by n wefts (where n is the initially set number), the places where the warps emerge from the wefts are regularly shifted. As a result, the points pushed up above the weft are arranged regularly and evenly for each weft and for the fabric.

In this way, the weft does not sink down from the surface intensively, and the generation of wire marks is prevented.

Example An example will be described with reference to the drawings.

FIG. 1 shows 10 warp yarns and 10 weft yarns in each of the upper and lower layers (n
= 6) is a plan view of the papermaking fabric of the present invention formed in (6). FIG. 2 is a cross-sectional view of the woven fabric of FIG. 1 taken along the line II ′, and FIG. 3 is a cross-sectional view of the woven fabric of FIG. 1 taken along the line II-II ′. FIG. 4 is a complete design diagram showing the complete structure of the woven fabric. 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 then under the next four wefts of bcde in the next adjacent upper layer. Then, after passing over the sixth upper weft f counted from the first weft a, it passes between this weft f and the next weft g, passes under the lower weft H, and passes through the upper weft j. It is located below. The next warp 2 passes under the first upper weft a, passes over the next weft b, then passes under the next weft c, passes under the lower weft E, and passes through the first weft E. Weft a
From the seventh upper layer weft g, and then below the three upper layer wefts h, i, j adjacent to this weft.

Looking at the arrangement of the two warps, it is understood that the warp 2 is displaced from the warp 1 in the complete design by six upper wefts. Hereinafter, similarly, warp 3 to 10
Are sequentially shifted by six wefts. The ten wefts A to J arranged in the lower layer are woven by the warp passing thereunder, and the lower layer weft through which the warp passes is, as apparent from FIGS. It is specified as follows.

As shown in FIG. 1 to FIG. 4, the lower weft in which the first warp 1 passed below is the eighth weft H counted from the first weft.
It is. The lower-layer weft passing through the sixth warp 6 counted from the warp 1 is the ninth weft I counted from the first weft A.

In other words, the first and sixth warp, the second and seventh warp, the third and eighth warp, the fourth and ninth warp, the fifth and the tenth warp,
It passes beneath the lower weft, where the even and odd numbers are reversed from each other, counting from the first weft. If the first warp passes under the odd-numbered lower weft, then the n-th (where n is an even number greater than or equal to 6 initially set) warp passes below the even-numbered weft. Of course, the reverse is also possible. By arranging the warps in this manner, the complete design shown in FIG. 4 is completed, and the upper weft is always pushed up at two places, and it is understood that there is no lower weft that is not woven. You.

Next, looking at the portion where the warp exerts the action of pushing up the upper weft, as apparent from FIG. 2, the upper wefts b and e are pushed upward by the warp 1, but the weft cd is not pushed up. The warp yarn 1 does not exert a lifting action on the weft yarns c and d. The upper weft g is not pushed upward because the warp 1 goes below the lower weft H because it passes below the lower weft H.

FIG. 4 explains the structure of the warp single weft double double woven fabric shown in FIG. 1 having such a structure in an easy-to-understand manner.

In FIG. 4, x indicates a place where the warp is above the upper layer weft. Δ indicates a place where the warp is under the lower weft. It can be seen that the position of △ between warp 1 and warp 6 is shifted by one, and the odd and even numbers of the lower weft passing below, counted from the first weft, are reversed. In FIG. 4, the circles indicate locations where the upper layer of the weft is pushed upward by the warp underneath.

The upper weft yarn a is pushed upward by the warps 2 and 7. Similarly, the weft yarn b is pushed upward by the warp yarns 1 and 6. In this way, each weft is pushed up every five warps, and the position where the weft is pushed up is uniform. Then, as is clear from FIG. 4, in the complete design, the positions where the wefts are pushed up are evenly arranged.

Therefore, in the double woven fabric for papermaking shown in FIGS. 1 to 4 having this complete structure, the upper layer of the weft does not intensively sink from the woven fabric surface, and the generation of wire marks is prevented.

Fig. 5 shows 14 warp yarns and 14 weft upper / lower angles (n = 8).
FIG. 2 is a complete design diagram showing the complete structure of the papermaking fabric of the present invention formed by the method of FIG. 6 and 7 show cross sections of the woven fabric of FIG. 5 similarly to FIGS. 2 and 3.

As apparent from FIG. 5, the weft of each upper layer is pushed upward by the warp at two places, and the pushing up interval is constant at the interval of 7 warps, and the pushing up places are arranged uniformly in the complete design. You can see that it is.

Next, FIGS. 5 and 6 show that in the woven fabric shown in this embodiment, there are two places where each warp passes under the lower weft. That is, the first warp 1 passes under the tenth and twelfth even lower wefts J and L counted from the first weft A, but the eighth warp 8 is the eleventh counted from the first weft A. It can be seen that the even and odd numbers are opposite to each other, passing under the 13th odd number lower wefts K and M. The warp may pass under any number of lower wefts, as long as the requirement that the even and odd numbers of the lower and upper wefts pass below each warp and the n-th warp is reversed.

The embodiment shown in the complete design drawing of FIG.
This is a warp single-weft double-duplex papermaking fabric in which 10) warp and 18 upper and lower wefts are arranged.

The embodiment shown in the complete design diagram of FIG. 9 is a warp single double weft double papermaking fabric in which 22 (n = 12) warp yarns and 22 upper and lower weft yarns are arranged.

As is clear from FIGS. 8 and 9, in all the woven fabrics, the upper layer weft is pushed upward at two locations and at equal intervals. Then, it can be seen that the push-up portions are evenly distributed in the complete structure.

Also, at the position where the warp passes under the lower weft, the odd and even numbers of the first and the n-th warp are the reverse wefts, and there is no unwoven weft.

[Effect] As described above, in the double woven fabric for papermaking of the warp single weft double according to the present invention, each upper weft is always pushed upward at two places and at evenly spaced positions, and furthermore, in the complete design. The push-up portions are necessarily evenly distributed and arranged, and there is no sinking on the concentrated surface of the warp, thereby preventing the generation of wire marks. Furthermore, since the surface of the woven fabric is mostly formed of weft yarns, the supportability of the fiber is good, the paper strength is improved, and the yield is very good. The warp extends almost vertically and has a good posture stability, and the wear surface is formed by the lower weft, so that the wear resistance is extremely excellent, and the effect is excellent.

[Brief description of the drawings]

FIG. 1 is a plan view of the papermaking fabric of the present invention composed of six warps and six upper and lower wefts. FIG. 2 is a cross-sectional view of the woven fabric of FIG. 1 cut along II ′, and FIG.
It is sectional drawing cut | disconnected by II '. FIG. 4 is a complete design drawing of FIG. FIG. 5 is a complete design diagram of the papermaking fabric of the present invention composed of 14 warp and 14 upper and lower wefts, FIG. 6 is a sectional view cut along the warp, and FIG. It is sectional drawing which cut | disconnected. Figure 8 shows the warp and weft 18
FIG. 9 is a complete design diagram of the papermaking woven fabric of the present invention comprising 22 warps and 22 wefts. 1 to 22: warp, a to v: upper weft, A to V: lower weft

Claims (1)

(57) [Claims] A. (n-1) .times.2 (n is equal to or greater than 6 and equal to or less than) even wefts are arranged in upper and lower two layers, and (n-1) .times.2
The first one of the warps is replaced with the first one of the upper layers.
After passing over the weft of the book, passing under the next (n-2) adjacent upper wefts, passing over the nth upper weft, counting from the first weft, then this weft and the next After passing between adjacent wefts, passing under the lower weft and counting from the first weft, it is arranged under the (n-1) × second upper weft, B. Each warp is referred to as weft n (however, , N is an even number of 6 or more initially set), and each of the warps is arranged in the same manner. C. Each warp is composed of the warp and the n-th warp (where n is the first set number). A double woven fabric for papermaking, having a complete structure formed by passing under the different lower wefts, one of which is odd if the other is odd, counting from the first weft