JPH0382889A - Double cloth for papermaking - Google Patents

Abstract

PURPOSE:To prevent upper-layer weft yarns from their being depressed on a papermaking surface and obtain the subject cloth forming a smooth papermaking surface without any recessed parts by forming long crimps in the upper-layer weft yarns and forming crimps having a length of 3 or more warp yarns by a specific method. CONSTITUTION:Each warp yarn is arranged so that the adjacent 2 upper-layer weft yarns may be woven by one warp yarn and the next adjacent 2 weft yarns at an interval of 3 weft yarns from the upper-layer weft yarn woven with the initial warp yarn may be woven with the adjacent next warp yarn. Thereby, long crimps and short crimps are alternately arranged in the respective upper-layer weft yarns. The long crimps and short crimps are adjacent among the adjacent upper-layer weft yarns. Since the mutual long crimps and short crimps are prevented from adjoining, regular arrangement of crimps in the oblique direction of the warp yarns formed on the upper-layer weft yarns on the papermaking surface is divided into sections by the long crimps of the upper-layer weft yarns to prevent marks in the oblique direction from occurring in paper.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to m-products for paper manufacturing.

[Prior Art] In papermaking using a conventional fourdrinier, a slurry of stock is fed to a running endless papermaking machine. The papermaking fabric separates the cellulose fibers from the slurry and forms a wet paper web.6 From this point of view, the papermaking fabric acts as a filter for the formation of the wet paper web.

Mesh openings, also called fabric drain holes, function to separate water from the slurry. In addition, in a fourdrinier paper making machine, the paper making fabric also functions as a drive belt, so it is required that the fabric be subjected to tension in the machine direction and have good posture stability.

There are several problems in paper manufacturing, but the following requirements are particularly required for papermaking fabrics: high retention of paper stock, i.e., less loss of paper stock from the paper manufacturing surface, and the occurrence of wire marks. These characteristics include: good water resistance and low water retention, high abrasion resistance, and good posture stability.

In order to meet the above-mentioned demands for papermaking fabrics, various proposals have been made in the past. However, the current situation is that there is still no fabric for paper making that is fully satisfactory.

In recent years, for example, double-weft fabrics have become preferred because they do not have flat spaces and are dehydrated through three-dimensional spaces, resulting in slower dewatering compared to single-ply fabrics and better retention of fibers. However, it has the disadvantage that wire marks are generated due to the arrangement of crimps formed on the paper-making surface of the warp yarns and the elliptical pattern in which the weft yarns, which should be present between the warp yarns, are partially sunken into the paper-making surface.

One of our attempts was to create a so-called Mi weave in which the warp and weft are not woven in the intersecting manner that normally forms woven fabrics.
It has been proposed to increase the number of weft yarns on the paper-making surface by arranging floating yarns called floating yarns on the weft yarns to compensate for the depressed portions of the weft yarns, thereby forming the paper-making surface with the weft yarns. Although this proposal is an interesting technical idea in terms of increasing the number of weft threads on the paper manufacturing surface, it cannot be said to be sufficient yet. In other words, the weft yarns that are not woven into such a structure are just floating yarns and are moved by the fluid pressure applied to the weft yarns when slurry is supplied to the papermaking fabric, resulting in so-called shifting of the weft yarns, which prevents a uniform papermaking surface. I can't maintain it.

Furthermore, if this type of floating yarn is provided between the upper wefts of the double supplement, the spacing between the wefts must be widened because the reactor water resistance will be reduced. For this reason, the density of the lower layer weft that forms the running surface decreases, and i! The wear volume is reduced, the running life is significantly shortened, and there are practical problems such as fibrillation of floating yarns due to showering.

The problem of wire marks is particularly noticeable in the case of weft force (single-ply fabrics that protrude from the papermaking surface).

It has been proposed to use multiple fabrics in order to maintain drainage performance, to form a fine mesh on the paper-making surface, and to impart wear resistance, but none of these have been fully satisfactory.

[Problems to be Solved by the Invention] The present inventor has found that the above-mentioned paper stock retention properties are high, wire marks do not occur, r water resistance is good,
In order to solve problems such as high abrasion resistance and good posture stability, as a result of various researches, we have removed the structure in which the wefts collapse between the warp threads that form the paper-making surface in woven fabrics with a double weft structure. The paper making surface always forms a flat surface by crimping the warp and weft threads, and I! Ii! A long weft crimp is always interposed between the crimps formed by adjacent warp threads on the paper-making surface, and fibers are stuck in the crimp, and warp threads are formed on the paper-making surface by cutting between the crimps of adjacent warp threads. The present invention was completed by eliminating the problem and eliminating the occurrence of wire marks.

[Means for Solving the Problems] The present invention has the following features:
(n = 0, 4 or 6 or less) The shaft is a fabric with 18+n upper layer wefts, the number of upper layer wefts is twice the number of lower layer wefts, and each upper layer weft has a different number alternately. long crimps and short crimps are alternately formed over the warp threads of In a repeating pattern, it is woven into the fabric over two adjacent top wefts, and the next adjacent warp is the next two top wefts placed three lengths from the two top wefts that the first warp crossed. A complete weave is formed on the paper-making surface, passing over the weft and being woven into the weft, and then in the same way sequentially up to the 18+nth warp.
The upper layer weft (18+
n) Double woven fabric for papermaking, comprising a lower weft thread that is woven into the structure at least once by weight.

2. The fabric has 18 wefts and 18 shafts in the upper layer, and the long crimp formed by each weft in the upper layer has 10 warps.
2. A double-woven fabric for papermaking as claimed in claim 1, wherein the short crimp is for six warp threads.

3. The fabric has 22 upper layer wefts and 22 warp yarns, and the long crimp formed by each upper layer weft yarn has 12 warp yarns.
The double-woven fabric for papermaking according to claim 1, wherein the short crimp is the length of eight warp threads.

4. A woven fabric with 24 wefts or 24 shafts in the upper layer, each of the wefts in the upper layer has a long crimp or 18 warps.
The double-woven fabric for papermaking according to claim 1, wherein the short crimp is the length of four warp threads.

5. The tl! according to any one of claims 1 to 4, wherein a long crimp of the lower weft is formed on the running surface. Double woven fabric for paper making.

6. Claim 1, wherein the lower layer weft is thicker than the upper layer weft.
The double-woven fabric for papermaking according to any one of items 5 to 5.

7. The double woven fabric for papermaking according to any one of claims 1 to 6, wherein the lower layer weft of the running surface is composed of a polyamide weft and a polyester weft.

8. The double-woven fabric for papermaking according to any one of claims i to 7, wherein the lower layer weft of the running surface is a polyamide weft that is thicker than the polyester weft.

Since the present invention is a double woven fabric having the above composition, the paper making surface is formed with a rich weft, and each weft has long crimps and short crimps alternately formed, and long crimps and short crimps of the weft between adjacent upper layer yarns. ) ~ It has a special structure in which crimps are arranged adjacent to each other alternately. The running surface is characterized by a lower weft density than the papermaking surface. Also, each warp is
Two adjacent upper layer wefts are woven at the same time. This special configuration provides the excellent effects described in the next section.

In the present invention, in the case of a fabric with 18 upper wefts and 18 warps on the papermaking surface, the upper wefts from C form a short crimp of 6 warps and a long crimp of 10 warps; In the case of a 1#ll product with 22 upper wefts and 22 warps, the upper weft forms a short crimp for 8 warps and a long crimp for 12 warps. Also, the upper N weft on the paper making surface is f & 24 warp or 24 shaft.
In the case of a product, the upper weft yarns form a short crimp of 4 warps and a long crimp of 18 warps.The reason why lin 1 must be formed in this way will be explained below.

The upper layer weft that forms the papermaking surface is pushed down by the warp between the warps that weave the weft into the fabric, and is recessed from the papermaking surface to form a recess. On the other hand, the warp existing between the warps woven into the fabric by the upper weft is below the upper weft and pushes the upper weft upward, but in reality, the force pushing it down is greater than the force pushing it up. As a result, depressions are formed on the papermaking surface due to depressions of the upper weft yarns.

According to research by the present inventors, the larger the number of warp threads that are below the upper weft on the papermaking surface and push the upper weft upward, in other words, the longer the crimp formed by the upper weft, the greater the force that pushes the upper weft upward. Since it is pushed up, the depression becomes smaller.

The present inventors further conducted research and found that in order to prevent the upper layer weft from collapsing on the papermaking surface and to form a smooth papermaking surface without recesses, it is necessary to form a long crimp in the upper layer weft, and at least 3 warp The present invention was completed by elucidating that it is necessary to form a crimp with a length longer than the required length. If the length of the crimp formed on the upper weft is less than 3 warps, it is structurally impossible to completely prevent the upper weft from collapsing, resulting in depressions, making it impossible to form a completely smooth paper surface. Can not. This means that the range 1 of the pressing blade of the warp that presses down the upper weft is about one warp on each side of the contact area of the upper weft where the warp touches, and the area where the upper weft is formed is It can be logically understood that if the crimp is three or more warp threads, the influence of the warp push-down blade will be reduced, and the depression of the upper weft threads will be smaller.

Polyamide yarns and polyester yarns are suitable as yarns for weaving the fabric of the present invention, and in particular, polyester yarns are used for warp yarns, polyester yarns are used for upper weft yarns, and polyester yarns are used for lower weft yarns.
Fabrics using both polyamide yarn and polyester yarn exhibit very good performance, including posture stability and abrasion resistance.

The paper manufacturing product of the present invention is a woven fabric with double weft. The lower layer wefts are arranged every other upper layer weft and below the upper layer wefts.

That is, the lower layer weft is arranged below either the upper layer weft indicated by an odd number or an even number in the complete design drawing, which will be explained later.

In addition, the paper manufacturing product of the present invention is characterized in that the weft yarns forming the running surface form a long crimp, have a large effective wear-resistant volume, and have good wear resistance.

[Function] 2 The papermaking fabric of the present invention refined as described above has a structure in which each warp interweaves two adjacent upper layer wefts, and the next adjacent warp interweaves the two adjacent upper wefts at the beginning. By arranging the next two 19# wefts that are in contact with each other after placing three wefts from the upper layer weft woven by the warp threads of Since long crimps and short crimps are adjacent to each other between wefts, and long crimps and short crimps are prevented from adjoining each other, warp crimps are formed on top of the upper weft on the papermaking surface in a regular diagonal direction. The array is broken by the long crimp of the upper weft threads and does not produce any direction marks on the paper.

Wire marks that occur on paper stand out and are recognized as wire marks due to the regular arrangement of the paper's thickness, irregularities, etc., so it is possible to break up the arrangement and repeat the regular arrangement. Cutting it off is extremely rational and effective.

In addition, the papermaking surface formed by the high-density upper weft yarns has good paper stock retention properties during papermaking.3 Moreover, there is no pulp fiber sticking, preventing the occurrence of wire marks, and improving the papermaking process. This improves yield and paper smoothness.

Furthermore, the lower layer weft has a weft density that is 1/2 that of the upper layer weft, and since it forms a long crimp, it has good crimpability, and thick wefts can be arranged, so it works well in conjunction with the long crimp. , the wear volume of the weft yarn can be made very large, and the wear resistance is significantly increased.

Further, since thick yarns can be arranged as the lower layer wefts, rigidity can be imparted to the entire fabric, resulting in excellent posture stability.

In the present invention, the density of the lower layer weft is 1/2 that of the upper layer weft, so the water resistance is low, the shower effect is good, and the water retention is low. The structure of the woven fabric will be specifically explained in Examples based on the drawings.

[Example 1] Next, an example of the present invention will be explained in detail based on the drawings, showing a design diagram showing a complete structure.

4. Each design drawing is a complete design drawing showing the papermaking surface of the papermaking fabric of the present invention. Therefore, the lower layer wefts are arranged under every other upper layer weft in the papermaking surface structure. In this actual travel example, for the sake of explanation, the lower layer wefts are arranged below the upper layer wefts indicated by odd numbers in each complete design drawing.

In the complete design drawing, the warp threads are Arabic numerals, for example 1.2.
．． 3, and the upper weft threads are designated by dashed Arabic numerals, such as 1', 2', 3. Since the lower layer wefts are placed below the upper layer wefts, the number is 1/2, but for convenience of description, they are indicated by Arabic numerals with the same dash as the upper layer wefts, for example, 1', 2', 3, '. Although not shown in the design drawings, in the explanation they are shown in Arabic numerals with double tassels, such as 1'', 2'', 3,''. Also, in the drawings, the x indicates the position above the warp or upper weft. also indicates the position where the upper layer weft is woven into the fabric by the warp. Also, ○ indicates the position where the lower layer weft is woven into the fabric by the warp.

5 The example of FIG. 1 shows the complete organization of a papermaking fabric with 18 warps and 18 wefts.

The upper layer weft 1' in Fig. 1 is twice Mi by warp 1 and warp 8.
woven into the fabric. Then, a short crimp for 6 warps is formed between warp 1 and warp 8, and a short crimp for 10 warps is formed between the right side of this complete design drawing and the weaving area shown in the complete design drawing, which repeats to the left. Forms a long crimp.

In addition, the upper layer weft 2' is warp 1 and warp ] 2 and #I] weave is 2'.
It has been incorporated. Then, a long crimp of 10 warps is formed between warp 1 and warp 12, and a short crimp of 6 warps is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forming a crimp. Then, a short crimp of upper weft 1′ and upper weft 2
′ is adjacent to the long crimp.

Similarly, the other upper layer wefts 3' to 18' form a short crimp for six warps and a long crimp for warp ]○, respectively. It can be seen that the other upper layer wefts from 3' to 18' are similarly adjacent to the short upper layer weft]6 crimp and the long crimp.

The warp (■) passes over the upper wefts 1' and 2', and these two adjacent upper wefts are woven into the fabric.

Then, the lower layer weft 13'' is woven into the structure.

Also, the warp 2 is the top N@thread 2' to 3 woven by the warp 1.
The fabric is woven into the fabric by passing over the next two adjacent upper layer wefts 6' and 7'.

The lower layer weft 13'' is then woven into the fabric.

The other 3 to 18 warps are similarly woven into the fabric by passing over the next two adjacent upper wefts placed three times from the upper weft woven by the adjacent warp. The lower layer weft is then woven into the fabric once.

In this way, by weaving each warp thread into the fabric by passing over the next two upper layer wefts placed three times from the upper layer weft woven by the adjacent warp yarns, each of the warp yarns is woven into the weave, so that each warp thread is woven into the paper making surface. An array of directional crimps is shredded,
The regularity of the crimp formed by the warp yarns on the papermaking surface is disrupted, and the occurrence of wire marks is prevented. In addition, the paper-making surface has a flat surface formed by long crimp weft threads, and there is no depression of the weft threads between the warp threads on the paper-making surface. Furthermore, if the paper-making surface is formed with weft threads,
Since the paper material directly pierces the train holes existing between the warp threads and does not block the train holes, the drainage properties of the fabric are greatly improved. It is understood that there is always a long weft crimp intervening to prevent the fibers from getting stuck.

In this embodiment, each lower weft yarn is woven once into the fabric by an adjacent pair of warp yarns, forming a long crimp of 16 warp yarns. In other words, in this example, the weft yarns of the lower layer are woven into the structure once by a pair of adjacent warp yarns, so
It is understood that the crimpability of the lower layer weft is very good and thick weft can be used. Moreover, since an extremely long crimp is formed, the wear-resistant volume is large and the wear resistance is extremely good.

The embodiment of FIG. 2 shows a full III weave of the same warp 8 18 shaft 18 weft papermaking fabric as the embodiment of FIG.

The upper layer weft 1' in FIG. 2 is woven into the same structure by warp 1 and warp 8. Then, a short crimp of 6 warps is formed between warp 1 and warp 8, and a long crimp of 10 warps is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forming a crimp.

Further, the upper layer weft 2' is woven twice into the structure by the warp 1 and the warp 12. Then, a long crimp of 10 warps is formed between warp 1 and warp 12, and a short crimp of 6 warps is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forming a crimp.

The short crimp of the upper weft 1' and the long crimp of the upper weft 2' are adjacent to each other.

Similarly, the other upper layer wefts 3' to 18' form short crimps corresponding to 6 warps and long crimps corresponding to 10 warps, respectively. Similarly, it can be seen whether the short 9 crimps and long crimps of the other 3' to 18' upper wefts are adjacent to each other.

The warp 1 passes over the upper wefts 1' and 2', and these two adjacent upper wefts are woven into the fabric.

Then, lower layer wefts 11'' and 17'' are woven into the structure.

Also, the warp 2 is the upper layer weft 2' to 3 woven by the warp 1.
It is woven into the fabric by passing over the next two adjacent upper layer wefts 6' and 7' which are overlapped.

The lower layer wefts 3'' and 17'' are then woven into the fabric.

The other 3 to 18 warps are similarly woven into the fabric by passing over the next two adjacent upper layer wefts placed three times from the upper layer weft woven by the adjacent warp. And the lower layer weft is woven into two identical structures.

In this way, each warp passes from the upper layer weft woven by the adjacent warp to the next two adjacent upper layer wefts that are placed three times over and weaves into the fabric, so that the adjacent warp yarns form a diagonal direction on the paper making surface. 0 The arrangement of crimps is disrupted, the regularity of the crimps formed by the warp yarns on the paper making surface is disrupted, and the occurrence of wire marks is prevented. In addition, the paper-making surface has a flat surface formed by long crimp weft threads, and there is no depression of the weft threads between the warp threads on the paper-making surface. Furthermore, as mentioned above, long weft crimps are always interposed between adjacent warp threads or crimps formed on the papermaking surface, and it is understood that each lower weft thread is prevented from being stuck by the fibers. In the example, the warp yarns of the adjacent pair ■ are placed twice on #l1m, forming a long crimp of 9 warp yarns and a short crimp of 5 warp yarns. In other words, in this example, the weft yarns of the lower layer are woven in the same structure by a pair of adjacent warp yarns, so the stiffness of the fabric is high and the posture stability is good, and the crimpability of the lower layer weft yarns is very good, resulting in thick It is understood that weft can be used. Moreover, it forms a long crimp and has extremely good wear resistance.

The example of FIG. 3 shows the complete organization of a papermaking fabric with 22 warp yarns and 22 weft yarns.

1 The upper layer weft J' in Fig. 3 is twice a by warp J and warp 14.
woven into the fabric. Then, a long crimp of 12 warps is formed between warp 1 and warp 14, and a short crimp of 8 warps is formed between the weaving area shown in the complete design drawing repeated to the right or left of this complete design drawing. Forming a crimp.

Further, the upper layer weft 2' is woven twice into the structure with warp 1 and warp]0. Then, a short crimp of 8 warps is formed between warp 1 and warp 10, and a long crimp of 12 warps is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forming a crimp.

and "a short crimp of the double layer weft 1' and the upper layer weft 2'
adjoined by a long crimp.

Similarly, the other upper layer wefts 3' to 22' form short crimps corresponding to 8 warps and long crimps corresponding to 12 warps, respectively. It can also be seen that the other upper layer wefts 3' to 22' have short crimps and long crimps adjacent to each other in the same way.

2. The warp 1 passes over the upper wefts 1' and 2', and these two adjacent upper wefts are woven into the fabric.

Then, the lower layer weft 13'' is woven into the structure.

Also, the warp 2 is the upper layer weft 2' to 3 woven by the warp 1.
The fabric is woven into the fabric by passing over the next two adjacent upper layer wefts 6' and 7'.

The lower layer weft 13'' is then woven into the fabric.

The other 3 to 22 warps are similarly woven into the M-weave by passing over the next two adjacent upper wefts placed three times from the upper weft woven by the adjacent warp. The lower layer weft is then woven into the fabric once.

In this way, each warp thread passes over two adjacent upper weft threads placed three times from the upper weft thread woven by the neighboring warp threads into the fabric, thereby creating a diagonal direction formed by the adjacent warp threads on the paper-making surface. An array of crimps is shredded,
The regularity of the crimp formed by the warp yarns on the papermaking surface is disrupted to prevent the occurrence of wire marks. In addition, the paper-making surface is a flat surface formed by long crimps of the weft threads, and there is no depression of the weft threads between the warp threads on the three paper-making faces. Furthermore, as mentioned above, it is understood that long weft crimps are always interposed between adjacent warp threads or crimps formed on the paper-making surface, thereby preventing fibers from getting stuck.

In this example, each lower weft yarn is woven once into the fabric by an adjacent pair of warp yarns, forming a long crimp of 20 warp yarns. In other words, in this example, the weft yarns of the lower layer are woven into the structure once by a pair of adjacent warp yarns, so
It is understood that the crimpability of the lower layer weft is very good and thick weft can be used. Moreover, it forms an extremely long crimp and has extremely good wear resistance.

The embodiment shown in FIG. 4 shows the complete structure of an i-piece with 22 warp threads and 22 weft threads.

The embodiment shown in FIG. 4 has the same papermaking surface as the embodiment shown in FIG. 3, but differs in the position at which the lower layer weft is woven. Fourth
The upper layer weft 1' in the figure is woven into the structure twice by the warp 1 and the warp 14. Then, between the warp 1 and the warp 14, a long tarinope of 12 warp threads is formed, and between the weaving area shown in the complete design drawing repeated to the right or left of this complete design drawing, a warp length of 8 wood threads is formed. Forms a short crimp.

Further, the upper layer weft 2' is woven twice into the #I weave by warp 1 and warp 10. Then, a short crimp of 8 warps is formed between warp 1 and warp 10, and a long crimp of 12 warps is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forming a crimp. Then, the long crimp of the upper weft 1' and the upper weft 2'
short crimp or adjacent.

Similarly, the other upper layer wefts 3' to 22' form short crimps corresponding to 8 warps and long crimps corresponding to 12 warps, respectively. Then, it can be seen whether the adjacent upper layer wefts are a short crimp or a long crimp or are adjacent to each other.

The warp threads 1 pass over the upper weft threads 1' and 2', and these two adjacent upper weft threads are woven into the fabric.

The lower layer wefts 15'' and 21'' are then woven into the fabric.

5 In addition, the warp 2 is the upper layer weft 2' to 3 woven by the warp 1.
It passes over the upper layer wefts 6' and 7' of the next two adjacent trees after the main one, and is woven into the #ll weave. and lower N weft 9″
and 15" are incorporated into the organization.

The other 3 to 22 warps are similarly woven into the fabric by passing over the next two adjacent upper wefts placed three times from the adjacent warp or the interwoven upper weft. The lower layer weft is woven into the fabric twice.

In this way, each warp thread passes over two adjacent upper weft threads placed three times from the upper weft thread woven by the neighboring warp threads into the fabric, thereby creating a diagonal direction formed by the adjacent warp threads on the paper-making surface. An array of crimps is shredded,
The regularity of the crimp formed by the warp yarns on the papermaking surface is disrupted to prevent wire marks from occurring. In addition, the paper-making surface has a flat surface formed by long crimp weft threads, and there is no depression of the weft threads between the warp threads on the paper-making surface. Furthermore, as mentioned above, it is understood that long weft crimps are always interposed between the crimps 6 formed by adjacent warp yarns on the paper-making surface, thereby preventing fibers from getting stuck.

The lower weft 1'' is woven into the structure in two places by a pair of warps 7.8 and 18.19;
1, a crimp for nine warp threads is formed between them, and a crimp for nine warp threads is formed between the weaving parts shown in the complete design drawing that repeats to the right or left of this complete design drawing. There is.

In this example, the lower layer weft yarns are woven into the same structure by a pair of adjacent warp yarns, so the fabric has high rigidity and good posture stability, and the crimpability of the lower layer weft yarns is very good. It is understood that it can be used. Moreover, it is characterized by forming a long crimp.

The example of FIG. 5 shows the complete construction of a 24 warp shaft 24 weft fabric.

The upper layer weft 1' in FIG. 5 is woven into the same structure by warp 1 and warp 20. Then, a long crimp of 18 warps is formed between warp 1 and warp 20, and 4 warps are formed between the weaving part shown in the complete design drawing that repeats to the right or left of this complete design drawing. Form a short crimp.

Further, the upper layer weft 2' is woven into the Mi weave twice by warp 1 and warp 6. Then, between warp 1 and warp 6, warp 4
A short crimp corresponding to the main body is formed, and a long crimp corresponding to 18 warp threads is formed between the weaving portion shown in the complete design drawing repeated to the right or left of this complete design drawing. The long crimp of the upper weft 1' and the long crimp of the upper weft 2' are adjacent to each other.

Similarly, the other upper N wefts 3' to 24' form short crimps corresponding to 4 warps and long crimps corresponding to 18 warps, respectively. It can be seen that adjacent upper layer wefts have short crimps and long crimps adjacent to each other.

The warp 1 passes over the upper wefts 1' and 2', and these two adjacent upper wefts are woven into the fabric.

And the lower layer weft 11'' is woven into the structure6.
The warp 2 is the next two adjacent upper wefts 6.7' that are placed three from the upper weft 28' woven by the warp 1.
It passes over and is woven into the organization. and lower weft 1
9″ is incorporated into the organization.

The other 3 to 24 warps are similarly woven into the #II weave by passing over the next two adjacent upper layer wefts, every three upper layer wefts woven by the adjacent warps. The lower layer weft is woven into the same structure.

In this way, each warp thread passes over two adjacent upper weft threads placed three times from the upper weft thread woven by the neighboring warp threads into the fabric, thereby creating a diagonal direction formed by the adjacent warp threads on the paper-making surface. An array of crimps is shredded,
The regularity of the crimp formed by the warp yarns on the paper making surface is disrupted and the occurrence of wire marks is prevented. In addition, the paper-making surface has a flat surface formed by long crimp weft threads, and there is no depression of the weft threads between the warp threads on the paper-making surface. Furthermore, as mentioned above, it is understood that there is always a long weft crimp interposed between the crimps formed by adjacent warp threads on the paper making surface, and this prevents the fibers from getting stuck.

The lower weft l'' is woven into the fabric at two locations by the warp threads 8.23, forming a long crimp of 14 warp threads between these warp threads 8.23. A short crimp of eight warp threads is formed between the weaving part shown in the complete design drawing repeated on the left.

In the embodiment shown in FIG. 5, the weaving positions of the lower layer wefts of adjacent warps are different. The lower weft yarns are fully woven twice to form a long crimp of 14 warp yarns and a short crimp of 8 warp yarns. In this embodiment, the number of weavings of the lower layer weft is large, so the woven fabric has high rigidity and excellent posture stability.

The example of FIG. 6 shows the complete construction of a 24 warp shaft 24 weft fabric.

The upper layer weft 1' in FIG. 6 is woven into two identical structures by warp 1 and warp 20. Then, a long crimp of 18 warps is formed between warp 1 and warp 20, and a crimp of 4 warp 0 threads is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forms a short crimp.

Further, the upper layer weft 2' is woven into the M weave twice by warp 1 and warp 6. Then, a short crimp of 4 warps is formed between warp 1 and warp 6, and a long crimp of 18 warps is formed between the weaving area shown in the complete design drawing that repeats to the right or left of this complete design drawing. Forming a crimp. The long crimp of the upper weft 1' and the long crimp of the upper weft 2' are adjacent to each other.

Similarly, the upper wefts 3' to 24' of the pond form a thick crimp for four warps and a long crimp for 18 warps, respectively. It can be seen that adjacent upper layer wefts have short crimps and long crimps adjacent to each other.

The warp 1 passes over the upper wefts 1' and 2', and these two adjacent upper wefts are woven into the fabric.

The lower wefts 5'' and 23'' are then woven into the fabric.

Also, the warp 2 is the upper layer weft 2' to 3 woven by the warp 1.
The next two adjacent upper layer wefts 61. It passes over 7' and is woven into the Aff weave. The lower layer wefts 15'' and 23'' are then woven into the fabric.

The other 3 to 24 warps are similarly woven into the fabric by passing over the next two adjacent upper wefts placed three times from the upper weft woven by the adjacent warp. And the lower layer weft is woven into two identical structures.

In this way, each warp passes over the next two adjacent upper wefts placed three times from the upper weft woven by the adjacent warp, and weaves into #I1m, thereby creating a crimp formed by the adjacent warps on the paper making surface. The regularity of the wire marks is broken and the occurrence of wire marks is prevented. In addition, the paper-making surface has a flat surface formed by the long crimps of the weft threads, and there is no depression of the weft threads between the warp threads on the paper-making surface.Furthermore, as mentioned above, there is a gap between the crimps formed by adjacent warp threads on the paper-making surface. It is understood that there is always a long weft crimp intervening to prevent the fibers from getting stuck.

The lower layer weft 1'' is woven into the same structure by a pair of warp yarns 4.5 and 11.12 2, and a pair of warp yarns 4.5 and 1.
1. Form a crimp for 5 warps between 1.12 and 15 long talimbs for 15 warps between the weaving area shown in the complete design diagram that repeats to the right or left of this complete design diagram. is forming.

In this embodiment, the weft yarns of the lower layer are woven in two identical structures by a pair of adjacent warp yarns, so the weft yarns of the lower layer are woven together many times, and the fabric has high rigidity and excellent posture stability. Moreover, it is understood that the crimpability of the lower layer weft is very good, and thick weft can be used. Since a very long crimp is formed, the wear volume can be very large.

FIGS. 7 to 9 are cross-sectional views of the paper-making fabric of the present invention, and for convenience of explanation, a part of the complete structure that repeats every floor is also shown. For example, warps 19-27 in FIG. 7 are warps that are shown in complete weave repeating next to each other, but are shown here.

FIG. 7 shows a cross-sectional view of the papermaking fabric of FIG. 1 taken along lines I- and T'. The upper weft 7' is woven with the warp 213, forming a long crimp of 130 warps on the warps 3 to 12, and a short crimp of 6 warps on the warp 14 to 1. .

On the other hand, the lower layer weft 7'' is woven into the fabric with one pair of warps 7 and 8, forming a long crimp of 16 warps between the pair of warps 25 and 26.

FIG. 8 shows a cross-sectional view of the papermaking fabric of FIG. 2 taken along line I[-II'. The upper layer weft 17' is woven with warps 4 and 15, with a long crimp of 10 warps formed on warps 5-14, and a short crimp of 6 warps formed on warps 16-21. ing.

On the other hand, the lower layer weft 17'' is a pair of warps 1.2 and 12.1.
3, and 19.20 are woven into the #iI weave, forming a long crimp of 9 warps between the pair of warps 1.2 and 12, ]3, and also the pair of warps ]2.13 , and 19.2
0, a short crimp of five warp threads is formed between the two.

FIG. 9 shows a cross-sectional view of the V-paper m product shown in FIG. 3 taken along the line ur-m'. The upper weft 1' is woven with warp threads 1, 14, and 23, with a long crimp of 12 warps on warp threads 2 to 3, and a short crimp of 8 warp threads on warp threads 15 to 242. is forming.

On the other hand, the lower layer weft 1'' is connected to the adjacent pair of warps 3.4 and 25.
．． 26 and is woven into the tissue to form a long crimp of 20 warp threads.

As can be seen from the cross-sectional views of FIGS. 7 to 9, the papermaking surface of the present invention is formed by crimps in which the long and short upper layer wefts are arranged in a bridge-like manner on top of the warp threads, and are arranged alternately. It can be seen that the surface becomes flat and wire marks are prevented. In addition, a long crimp of the lower weft is formed on the running surface,
It can be seen that the wear resistance is increased.

FIG. 10 is a complete design drawing showing a conventional double-weft fabric with 16 sharfs 1 to 1.

In Fig. 10, the upper layer weft 1' is warp 3, warp 6, and warp 1.
1 and the warp threads 14 are woven into the same structure. Then, a crimp for two warps is formed between the warp threads 3 and 6 and between the warp threads 11 and 14, and a complete design is repeated between the warp threads 6 and 11 and on the right or left of this complete design drawing. A crimp for four warp threads is formed between the weaving area shown in the figure.

In addition, the upper layer wefts 2' are warp 1, warp 6, warp 9, and warp 1.
4, it is woven into the tissue four times. A short crimp of two warp threads is formed between the warp threads 6 and 9 and between the weaving portion shown in the complete design diagram repeated to the right or left of this complete design diagram. Further, the upper layer weft 2' forms a crimp for four warps between the warp 1 and the warp 6 and between the warp 1 and the warp 14.

Similarly, the other upper layer wefts 3' to 16' form crimps for four warps and short crimps for two warps, respectively.

As can be seen from this conventional example, the upper layer weft of the conventionally known 16-shaft papermaking fabric forms a short crimp with a length of two warps on the papermaking surface.

Figure 11 is a cross-sectional view taken along the TV-7V' line of the conventionally known 16-shaft fabric shown in Figure 10, showing a state in which the upper weft yarns are woven into the fabric by the warp yarns. . Upper layer weft 3' is warp 1, 4 and 9
and 12, it is woven into the #lI weave four times and pushed down. On the other hand, the warp threads 2.3 push the upper weft threads 3' upward, but the upper weft threads 3' are depressed below the position where the upper surfaces of the warp threads 1 and 4 are connected, and in this way the crimp of the upper weft threads causes the warp threads 2. It can be seen that if the paper is not long enough, recesses 26 will be formed on the paper making surface and the stock will sink into these recesses, causing wire marks. In Fig. 7, which is a practical example of the present invention, the length of the crimp of the upper layer weft is the length of 6 warp yarns even if the crimp is shorter, and in this case, there is no depression of the upper layer weft and the paper making surface is smooth. It is understood that

[Effects] Next, in order to explain the present invention in detail, the results of comparative tests on specific textiles will be shown.

Comparison Test 1 A papermaking fabric with 18 warp yarns (8 shafts) and 18 upper weft yarns (actual example 1) of the present invention shown in FIG. 1 and the conventional 16 warp yarns shown in FIG.
The results of a comparative test with the shaft papermaking fabric (Comparative Example 1) 7 are shown in Table].

All threads are monochrome A filament was used.

Table 1 8 (Note) PET: Polyester PA: Boryamide pulp liquid l Water Time: Freeness of newspaper waste 17
A pulp liquid with a concentration of 0.04%, prepared as 0 ml, was placed on the fabric at a water level of 300 mm, and the water level was 300 mm from the perpendicular to the fabric surface.
The time it takes for the water level to reach zero when pulp liquid is poured onto the fabric surface at a 5° inclination.

From the above test results, the papermaking fabric of the present invention has furnace water resistance,
It is clear that this fabric has extremely good effects in terms of pulp yield, smoothness, etc. compared to conventional fabrics.

three

[Brief explanation of drawings]

1 to 6 are complete design drawings showing an embodiment of the present invention. 7 is a cross-sectional view of the fabric shown in FIG. 1 taken along line I-1', and FIG. 8 is a cross-sectional view #I of the fabric shown in FIG. 2 taken along line II-If'. FIG. 9 is a cross-sectional view of the fabric shown in FIG. 3 taken along line II[-11I'. FIG. 10 is a complete design drawing of a conventional 16-shaft papermaking machine with double weft threads. Figure 11 shows the fabric shown in Figure 10.
FIG. 3 is a cross-sectional view taken along line IV'. The x in the drawing indicates the position where the warp is above the upper weft, but the x does not indicate the position where the upper weft is woven into the fabric by the warp. Moreover, ○ indicates the position where the lower layer weft is woven into the fabric by the warp. 1 to 24...Warp 1' to 24'...Upper weft 1'' to 2B'' (odd number)...Lower weft 0 White inside

Claims (1)

[Claims] 1. The wefts are arranged in two layers, upper and lower, and the warp is 18+n (n=
0, 4 or 6 or less) Shaft with upper weft of 18
+n fabrics, the number of upper layer wefts is twice the number of lower layer wefts, and each upper layer weft alternately crosses different numbers of warp yarns to form alternately long crimps and short crimps; A long crimp and a short crimp are adjacent to each other between the upper wefts, and one warp passes over two adjacent upper wefts in a repeating pattern every (18+n) upper wefts. The next adjacent warp is woven into the weave by passing over the next two upper wefts placed three times from the two upper wefts that the first warp has crossed, and so on in the same way. A complete weave is formed on the paper-making surface in which up to the 18+nth warp is woven into the weave, and the lower weft is woven into the weft of the upper weft.
The upper layer weft (18+
n) A double woven fabric for papermaking, in which the lower weft is woven into the structure at least once between the mains. 2. The fabric has 18 wefts in the upper layer and 18 shafts in the warp, and the long crimp formed by each weft in the upper layer is equivalent to 10 warps, and the short crimp is equivalent to 6 warps.Claim 1
A double woven fabric for paper making described in . 3. The fabric has 22 wefts in the upper layer and 22 shafts in the warp, and the long crimp formed by each weft in the upper layer is equivalent to 12 warps, and the short crimp is equivalent to 8 warps.Claim 1
A double woven fabric for paper making described in . 4. The fabric has 24 wefts in the upper layer and 24 shafts in the warp, and the long crimp formed by each weft in the upper layer is equivalent to 18 warps, and the short crimp is equivalent to 4 warps.Claim 1
A double woven fabric for paper making described in . 5. A long crimp of the lower weft was formed on the running surface.
A double-woven fabric for papermaking according to any one of claims 1 to 4. 6. The double woven fabric for papermaking according to any one of claims 1 to 5, wherein the lower layer weft is thicker than the upper layer weft. 7. The double woven fabric for papermaking according to any one of claims 1 to 6, wherein the lower layer weft of the running surface is composed of a polyamide weft and a polyester weft. 8. The double woven fabric for papermaking according to any one of claims 1 to 7, wherein the lower layer weft on the running surface is a polyamide weft that is thicker than the polyester weft.