JP2905794B2 - Double woven fabric for papermaking - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a papermaking fabric.

[Related Art] In papermaking using ordinary fourdrinier, a slurry of stock is supplied to a traveling endless fabric for papermaking. The papermaking fabric separates the cellulosic fibers from the slurry and forms a wet paper web. In other words, from this point of view, the papermaking fabric acts as a filter for forming a wet paper web. The mesh openings, also called drain holes in the fabric, serve to separate water from the slurry. In the Fourdrinier machine,
Since the papermaking fabric also functions as a drive belt, it must have a characteristic of receiving tension in the machine direction and need to have good posture stability.

There are some problems in papermaking, but the following are required, especially for papermaking fabrics: large retention of stock, i.e., less runoff of the stock from the papermaking surface, and wire marks No water retention, low water retention, high abrasion resistance, and good posture stability.

Various proposals have hitherto been made in order to meet the above demands for papermaking fabrics. However, at present, there is no satisfactory papermaking fabric.

In recent years, for example, a woven fabric having a double weft structure has no planar space, and is dehydrated in a three-dimensional space. However, there is a disadvantage that wire marks are generated due to the arrangement of crimps formed on the papermaking surface of the warp and the structure in which the weft to be present between the warps is partially depressed from the papermaking surface.

In one attempt, the fabric is usually woven in the fabric, not woven in the form of warps and wefts intersecting,
It has been proposed that a floating yarn called a floating yarn is arranged on the weft to increase the number of wefts on the papermaking surface to compensate for the depression of the weft and form the papermaking surface with the weft. This proposal is an interesting technical idea in terms of increasing the number of wefts on paper, but is not yet satisfactory. That is, the weft that is not woven into such a structure is just a floating yarn, and when the slurry is supplied to the papermaking fabric, it moves due to the fluid pressure applied to the weft, so-called weft deviation and a uniform papermaking surface. I can't keep it.
In addition, if such a floating yarn is provided between the upper wefts of the double structure, the space between the wefts has to be increased because the water-based property decreases. For this reason, the density of the lower layer weft forming the running surface is reduced, the abrasion resistance volume is reduced, the running life is remarkably shortened, and there are practical problems such as fibrillation of the floating yarn by a shower.

The problem of the wire mark is particularly remarkable in the case of a single woven fabric in which the weft projects on the papermaking surface.

It has also been proposed to use multiple woven fabrics to maintain drainability and to make the papermaking surface a fine mesh and to provide abrasion resistance, but these have not been satisfactory yet.

[Problems to be Solved by the Invention] The inventor of the present invention has described that the stock retention is large, that no wire mark is generated, that water is good, that abrasion resistance is large, and that the posture is stable. As a result of various researches to solve problems such as the fact that the weft is depressed between the warps forming the papermaking surface in the double-weft woven fabric, the papermaking surface is always flattened with the warp and weft crimps. A crimp of a long weft is always interposed between the crimps formed on the papermaking surface by the adjacent warp yarns, and the fibers are pierced or cut between the crimps of the adjacent warp yarns. Thus, the present invention has been completed by eliminating the regularity of the crimps formed on the substrate and preventing the occurrence of wire marks.

[Means for Solving the Problems] The present invention provides: "1. Weft yarns are arranged in two upper and lower layers, and the warp is 18 + n (n =
0, 4 or 6) shaft, the upper layer is 18 + n woven fabric, the number of upper layer wefts is twice the number of lower layer wefts, and each upper layer weft alternates over a different number of warps. A long crimp and a short crimp are alternately formed, and a long crimp and a short crimp are adjacent between adjacent upper wefts. A warp is a repetition pattern of (18 + n) upper warps, each of which is a warp. The next adjacent warp passes over the next two upper wefts, three from the two upper wefts over which the first warp has passed, and is woven into the fabric over the two adjacent upper wefts. In the same manner as described above, the complete weave is formed on the papermaking surface, and the lower weft is arranged at every other upper weft. The warp is the upper weft (18 + n)
A double woven fabric for papermaking, wherein a lower layer weft is woven into a structure at least once between the books.

2. The upper weft is a woven fabric with 18 threads and the warp is 18 shafts.
The double woven fabric for papermaking according to claim 1, wherein the long crimps formed by each of the upper wefts are 10 warps and the short crimps are 6 warps.

3. The upper weft is a woven fabric with 22 yarns and the warp with 22 shafts.
The double woven fabric for papermaking according to claim 1, wherein the long crimps formed by each of the upper-layer wefts are 12 warps and the short crimps are 8 warps.

4. The upper layer is a woven fabric with 24 wefts and a warp with 24 shafts.
The double woven fabric for papermaking according to claim 1, wherein the long crimps formed by each upper weft are 18 warps and the short crimps are 4 warps.

5. The papermaking double woven fabric according to any one of claims 1 to 4, wherein a long crimp of lower weft is formed on the running surface.

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

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

8. The lower weft of the running surface, wherein the polyamide weft is thicker than the polyester weft.
2. The papermaking double woven fabric according to the above item. About.

Since the present invention is a double woven fabric having the above structure, the papermaking surface is formed with a weft rich, each weft is formed with a long crimp and a short crimp alternately, and a long crimp and a short crimp of the weft are formed between adjacent upper-layer yarns. It has a special structure in which crimps are alternately arranged adjacently. The running surface is characterized by a lower weft density than the papermaking surface. Also, each warp is
Two adjacent upper wefts are woven simultaneously. With this special configuration, the excellent operation described in the following operation section is achieved.

In the present invention, the upper weft of the papermaking surface is 18, and the warp is
In the case of a 18-shaft woven fabric, the upper weft forms a short crimp for 6 warps and a long crimp for 10 warps. In addition, the upper layer of the papermaking surface has 22 upper wefts and the upper layer has a warp of 22 shafts. The weft has a short crimp of eight warps and 12 warps.
Form a long crimp for this. In the case of a woven fabric having 24 upper wefts and 24 shafts on the papermaking surface, the upper weft forms a short crimp for 4 warps and a long crimp for 18 warps, but such a crimp is formed. Explain why you must do so.

The upper layer weft forming the papermaking surface is pushed downward by warps between the warps weaving the weft into the fabric, and depressed from the papermaking surface to form a recess. On the other hand, the warp existing between the warps woven into the structure by the upper weft is located below the upper weft and pushes the upper weft upward, but in fact, the pushing force is larger than the pushing force, A recess is formed in the papermaking surface due to the depression of the upper weft.

According to the study of the present inventors, the higher the number of warps below the upper weft of the papermaking surface and pushing up the upper weft, in other words, the longer the crimp formed by the upper weft, the higher the upper weft with a larger force. The depression is small because it is pushed up.

The present inventors have further studied, and in order to prevent the upper weft from sinking on the papermaking surface and form a smooth papermaking surface without recesses, it is necessary to form a long crimp on the upper weft,
The inventors have clarified that it is necessary to form a crimp having a length of at least three warps and completed the present invention.
If the length of the crimp formed on the upper weft is equal to or less than three warps, it is impossible to completely prevent the upper weft from sinking structurally and a recess is generated, and a completely smooth papermaking surface cannot be formed. Can not. This means that the range of the pressing force of the warp that pushes the upper weft downward is about one warp on each side of the contact part of the upper weft in contact with the warp, and the crimp formed by the upper weft is the warp 3 It is logically understood that if the length is equal to or more than this, the influence of the pressing force of the warp decreases, and the depression of the upper weft decreases.

Polyamide yarn or polyester yarn is suitable as the yarn for weaving the woven fabric of the present invention.In particular, polyester yarn is used for the warp, polyester yarn is used for the upper weft, and polyamide yarn and polyester yarn are used for the lower weft. The woven fabric
It shows very good performance including posture stability and wear resistance.

The papermaking fabric of the present invention is a double weft fabric. The lower weft is arranged every other and below the upper weft. That is, the lower weft is disposed under any of the upper or lower wefts indicated by odd or even numbers in the complete design diagram described later.

Further, the papermaking fabric of the present invention is characterized in that the weft forming the running surface forms a long crimp, has a large effective abrasion resistance volume, and has good abrasion resistance.

[Operation] In the papermaking woven fabric of the present invention configured as described above, one warp weaves two adjacent upper wefts, and the next adjacent warp the first warp. By arranging the next two adjacent wefts placed three from the upper weft, long crimps and short crimps are alternately arranged on each upper weft, and long crimps between adjacent upper wefts. Since the short crimps are adjacent to each other and the long crimps and the short crimps are prevented from being adjacent to each other, the regular arrangement of the crimps of the warp in the diagonal direction, which is formed on the upper weft of the papermaking surface,
It is cut by the long crimp of the upper weft and does not generate diagonal marks on the paper. Wire marks generated on paper are recognized as prominent wire marks by regularly arranging the thickness, unevenness, etc. of the paper, so that the array is cut in this way to repeat the regular arrangement. Disconnecting is extremely rational and effective.
In addition, the papermaking surface formed by the high-density parallel arrangement of upper wefts has a good stock retention property during papermaking, does not pierce pulp fibers, prevents the generation of wire marks, and has a high papermaking yield. This improves the smoothness of the paper.

Furthermore, the lower weft has a coarse weft density that is 1/2 that of the upper weft, and because it forms a long crimp, it has good crimping properties, and a thicker weft can be arranged, so it is combined with a longer crimp. In addition, the abrasion resistance volume of the weft can be made very large, and the abrasion resistance increases remarkably.

Further, since a thick yarn can be arranged in the lower weft, rigidity can be imparted to the entire woven fabric, and the posture stability is excellent.

Further, in the present invention, since the lower weft has a coarse density which is 1/2 of that of the upper weft, the water resistance is small, the shower effect is good, and the water retention is small. The structure of the woven fabric will be specifically described in the embodiments based on the drawings.

[Examples] Next, examples of the present invention will be concretely described sequentially with reference to the drawings while showing design drawings showing a complete structure. Each design diagram is a complete design diagram showing the papermaking surface of the papermaking fabric of the present invention. Therefore, the lower layer weft is arranged every other upper layer of the papermaking surface texture and below it. In this embodiment, for the sake of explanation, a lower weft is arranged below an upper weft indicated by an odd number in each complete design drawing.

In the complete design drawing, the warp is Arabic numeral, for example 1,
The upper layer is indicated by Arabic numerals with dashes, for example, 1 ', 2', 3 '. Since the lower weft is arranged below the upper weft, the number of the lower weft is 1/2, but for convenience of description, Arabic numerals with the same dash as the upper weft are indicated by 1 ', 2', 3, and ', for example. Although not shown in the design drawing, it is indicated by Arabic numerals with double dashes in the description, for example, 1 ", 2", 3 ". In the figure," x "indicates the position where the warp is on the upper weft, and" x "indicates the position. Indicates the position where the upper layer weft is woven into the structure by the warp, and ○ indicates the position where the lower layer weft is woven into the structure by the warp.

The embodiment of FIG. 1 shows the complete design of a papermaking fabric with 18 warp and 18 shaft wefts.

The upper weft 1 'in FIG. 1 is woven twice in the design by the warp 1 and the warp 8. Then, a short crimp of six warps is formed between the warp 1 and the warp 8, and a long crimp of ten warps is formed between the warp 1 and the weaving portion shown in the complete design drawing that repeats to the right or left of the complete design drawing. Crimp is formed.

The upper weft 2 'is woven twice in the design with the warp 1 and the warp 12. And, between the warp 1 and the warp 12, the warp 10
A long crimp for this warp is formed, and a short crimp for six warps is formed between the weaving portion shown in the complete design drawing that repeats to the right or left of this complete design drawing. The short crimp of the upper weft 1 'and the long crimp of the upper weft 2' are adjacent to each other.

Similarly, each of the other upper wefts 3 'to 18' forms a short crimp for six warps and a long crimp for ten warps. In addition, it can be seen that the upper crimps of the other 3 ′ to 18 ′ similarly have the short crimp and the long crimp of the adjacent upper weft adjacent to each other.

The warp 1 passes over the upper wefts 1 ', 2' and weaves the two adjacent upper wefts into the design. The lower weft 13 ″ is woven into the structure.

Further, the warp 2 is woven into the structure by passing over the next two adjacent upper wefts 6 ′ and 7 ′, three of which are placed from the upper weft 2 ′ woven by the warp 1. And lower weft 13 ″
Is incorporated into the organization.

Similarly, each of the other 3 to 18 warp yarns is woven into the structure by passing over three adjacent upper weft yarns, three from the upper weft yarn woven by the adjacent warp yarn. The lower weft is woven once in the design.

In this way, the warp yarns are woven into the structure by passing over three adjacent upper wefts, three of which are placed from the upper warp woven by the adjacent warp, so that the adjacent warps form an oblique direction on the papermaking surface. Is crimped, the regularity of the crimp formed by the warp on the papermaking surface is broken, and the generation of wire marks is prevented. The papermaking surface has a flat surface formed by the long crimp of the weft, so that the weft does not sink between the warps on the papermaking surface. Further, when the papermaking surface is formed by weft yarn, the paper material does not directly penetrate into the drain holes existing between the warp yarns and does not block the drain holes. It is understood that a long weft crimp always intervenes between the crimps formed on the papermaking surface, thereby preventing the fiber from being stuck.

In this embodiment, each lower weft is woven once into a structure by a pair of adjacent warps to form a long crimp for 16 warps. In other words, in this example, the lower layer weft is woven once in the design by a pair of adjacent warps,
It is understood that the crimping property of the lower weft is very good and a thicker weft can be used. In addition, since an extremely long crimp is formed, the wear resistance volume is increased and the wear resistance is extremely good.

The embodiment of FIG. 2 shows the complete design of the papermaking fabric of the same 18 warps, 18 shafts and 18 wefts as the embodiment of FIG.

The upper weft 1 'in FIG. 2 is woven twice in the design by the warp 1 and the warp 8. Then, a short crimp of six warps is formed between the warp 1 and the warp 8, and a long crimp of ten warps is formed between the warp 1 and the weaving portion shown in the complete design drawing that repeats to the right or left of the complete design drawing. Crimp is formed.

The upper weft 2 'is woven twice in the design with the warp 1 and the warp 12. And, between the warp 1 and the warp 12, the warp 10
A long crimp for this warp is formed, and a short crimp for six warps is formed between the weaving portion shown in the complete design drawing that repeats to the right or left of this complete design drawing. The short crimp of the upper weft 1 'and the long crimp of the upper weft 2' are adjacent to each other.

Similarly, each of the other upper wefts 3 'to 18' forms a short crimp for six warps and a long crimp for ten warps. In addition, it can be seen that the upper crimps of the other 3 ′ to 18 ′ similarly have the short crimp and the long crimp of the adjacent upper weft adjacent to each other.

The warp 1 passes over the upper wefts 1 ', 2' and weaves the two adjacent upper wefts into the design. The lower wefts 11 "and 17" are woven into the structure.

Further, the warp 2 is woven into the structure by passing over the next two adjacent upper wefts 6 ′ and 7 ′, three of which are placed from the upper weft 2 ′ woven by the warp 1. And lower weft 3 ″
And 17 ″ are incorporated into the organization.

Similarly, each of the other 3 to 18 warp yarns is woven into the structure by passing over the next two adjacent upper weft yarns, three from the upper weft yarn woven by the adjacent warp yarn. And the lower layer weft is woven twice in the design.

In this way, the warp yarns are woven into the structure by passing over three adjacent upper wefts, three of which are placed from the upper warp woven by the adjacent warp, so that the adjacent warps form an oblique direction on the papermaking surface. The crimp arrangement is cut off, the regularity of the crimp formed by the warp on the papermaking surface is broken, and the generation of wire marks is prevented. In addition, the papermaking surface has a flat surface formed by the long crimp of the weft,
There is no weft collapse between warps on the papermaking surface. Further, as described above, it is understood that a long weft crimp is always interposed between the crimps formed by the adjacent warps on the papermaking surface, and that the lower wefts are prevented from being stuck. In the embodiment, a pair of adjacent warp yarns are woven twice in a structure to form a long crimp for 9 warp yarns and a short crimp for 5 warp yarns. That is,
In this embodiment, the lower weft is woven twice in the design by a pair of adjacent warps, so the stiffness of the woven fabric is large, the posture stability is good, and the crimping property of the lower weft is very good. It is understood that it can be used. Moreover, a long crimp is formed, and the wear resistance is extremely good. The embodiment of FIG. 3 shows the complete design of a papermaking fabric of 22 warp 22 shaft wefts.

The upper weft 1 'in FIG. 3 is woven twice in the design by the warp 1 and the warp 14. Then, a long crimp equivalent to 12 warps is formed between the warp 1 and the warp 14, and a short crimp equivalent to 8 warps is formed between the warp 1 and the weaving portion shown in the complete design drawing which repeats to the right or left of the complete design drawing. Crimp is formed.

The upper weft 2 'is woven twice in the design with the warp 1 and the warp 10. And, between warp 1 and warp 10, warp 8
A short crimp for this warp is formed, and a long crimp for 12 warps is formed between the weaving portion shown in the complete design drawing that repeats to the right or left of the complete design drawing. 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 wefts 3 'to 22' also form a short crimp for eight warps and a long crimp for 12 warps. It can also be seen that the other upper 3 'to 22' upper wefts also have adjacent short and long crimps of adjacent upper wefts.

The warp 1 passes over the upper wefts 1 ', 2' and weaves the two adjacent upper wefts into the design. The lower weft 13 ″ is woven into the structure.

Further, the warp 2 is woven into the structure by passing over the next two adjacent upper wefts 6 ′ and 7 ′, three of which are placed from the upper weft 2 ′ woven by the warp 1. And lower weft 13 ″
Is incorporated into the organization.

Similarly, each of the other 3 to 22 warps is woven into the structure by passing over the next two adjacent upper wefts, three from the upper weft woven by the adjacent warp. The lower weft is woven once in the design.

In this way, the warp yarns are woven into the structure by passing over three adjacent upper wefts, three of which are placed from the upper warp woven by the adjacent warp, so that the adjacent warps form an oblique direction on the papermaking surface. The crimp arrangement is cut off, the regularity of the crimp formed by the warp on the papermaking surface is broken, and the generation of wire marks is prevented. In addition, the papermaking surface has a flat surface formed by the long crimp of the weft,
There is no weft collapse between warps on the papermaking surface. Further, as described above, it is understood that the long weft crimp is always interposed between the crimps formed by the adjacent warps on the papermaking surface, thereby preventing the fibers from being stuck.

In this embodiment, each lower weft is woven once into a structure by a pair of adjacent warps, forming a long crimp for 20 warps. In other words, in this example, the lower layer weft is woven once in the design by a pair of adjacent warps,
It is understood that the crimping property of the lower weft is very good and a thicker weft can be used. Moreover, an extremely long crimp is formed and the wear resistance is extremely good.

The embodiment of FIG. 4 shows the complete design of a woven fabric of 22 warp and 22 shaft wefts.

The embodiment shown in FIG. 4 has the same paper-making surface as the embodiment shown in FIG. 3, and is different from the embodiment shown in FIG. The upper weft 1 'in FIG. 4 is woven twice in the design by the warp 1 and the warp 14. And a warp between warp 1 and warp 14
A long crimp of 12 minutes is formed, and a short crimp of eight warps is formed between the crimped portion shown in the complete design drawing repeated to the right or left of the complete design drawing.

The upper weft 2 'is woven twice in the design with the warp 1 and the warp 10. And, between warp 1 and warp 10, warp 8
A short crimp for this warp is formed, and a long crimp for 12 warps is formed between the weaving portion shown in the complete design drawing that repeats to the right or left of the complete design drawing. The long crimp of the upper weft 1 'and the short crimp of the upper weft 2' are adjacent to each other.

Similarly, the other upper wefts 3 'to 22' also form a short crimp for eight warps and a long crimp for 12 warps. It can be seen that the adjacent upper weft is adjacent to the short crimp and the long crimp.

The warp 1 passes over the upper wefts 1 'and 2' and weaves the two adjacent upper wefts into the design. The lower wefts 15 "and 21" are woven into the fabric.

The warp yarn 2 is woven into the structure by passing over three adjacent upper weft yarns 6 ′ and 7 ′, which are three adjacent to the upper weft yarn 2 ′ woven by the warp yarn 1. And the lower weft 9 "
15 "is incorporated into the organization.

Similarly, each of the other 3 to 22 warps is woven into the structure by passing over the next two adjacent upper wefts, three from the upper weft woven by the adjacent warp. And the lower layer weft is woven twice in the design.

In this way, the warp yarns are woven into the structure by passing over three adjacent upper wefts, three of which are placed from the upper warp woven by the adjacent warp, so that the adjacent warps form an oblique direction on the papermaking surface. The crimp arrangement is cut off, the regularity of the crimp formed by the warp on the papermaking surface is broken, and the generation of wire marks is prevented. In addition, the papermaking surface has a flat surface formed by the long crimp of the weft,
There is no weft collapse between warps on the papermaking surface. Further, as described above, it is understood that the long weft crimp is always interposed between the crimps formed by the adjacent warps on the papermaking surface, thereby preventing the fibers from being stuck.

The lower weft 1 ″ is formed by a pair of warps 7, 8 and 18, 19.
Woven into the fabric at the point, a pair of warp 7, 8 and 18, 19,
A crimp for nine warps is formed in between, and a crimp for nine warps is formed between the knitted portions shown in the complete design diagram repeated to the right or left of the complete design diagram.

In this embodiment, the lower weft is woven twice in the design by a pair of adjacent warps, so the stiffness of the woven fabric is large, the posture stability is good, and the crimping property of the lower weft is very good. It is understood that it can be used. Moreover, it is characterized by forming a long crimp.

The embodiment of FIG. 5 shows the complete design of the woven fabric of the invention according to the invention.

The upper weft 1 'in FIG. 5 is woven twice in the design by the warp 1 and the warp 20. Then, a long crimp for 18 warps is formed between the warp 1 and the warp 20, and a short crimp for four warps is formed between the warp 1 and the warp portion shown in the complete design drawing which repeats to the right or left of the complete design drawing. Crimp is formed.

The upper weft 2 'is woven twice in the design with the warp 1 and the warp 6. And, between warp 1 and warp 6, warp 4
A short crimp for this is formed, and a long crimp for 18 warp yarns is formed between the short crimp and the weaving portion shown in the complete design drawing which repeats to the right or left of the complete design drawing. The long crimp of the upper weft 1 'and the short crimp of the upper weft 2' are adjacent to each other.

Similarly, the other upper wefts 3 'to 24' also form a short crimp for four warps and a long crimp for 18 warps. It can be seen that the adjacent upper weft is adjacent to the short crimp and the long crimp.

The warp 1 passes over the upper wefts 1 ', 2' and weaves the two adjacent upper wefts into the design. And the lower weft 11 "is woven into the structure.

Further, the warp 2 is woven into the structure by passing over three adjacent upper wefts 6 ′ and 7 ′, which are three adjacent to the upper weft 2 ′ woven by the warp 1. And the lower layer weft 19 ″ is woven into the structure.

Similarly, each of the other 3 to 24 warp yarns is woven into the structure by passing over the next two adjacent upper weft yarns, three from the upper weft yarn woven by the adjacent warp yarn. The lower weft is woven once in the design.

In this way, the warp yarns are woven into the structure by passing over three adjacent upper wefts, three of which are placed from the upper warp woven by the adjacent warp, so that the adjacent warps form an oblique direction on the papermaking surface. The crimp arrangement is cut off, the regularity of the crimp formed by the warp on the papermaking surface is broken, and the generation of wire marks is prevented. In addition, the papermaking surface has a flat surface formed by the long crimp of the weft,
There is no weft collapse between warps on the papermaking surface. Further, as described above, it is understood that the long weft crimp is always interposed between the crimps formed by the adjacent warps on the papermaking surface, thereby preventing the fibers from being stuck.

The lower weft 1 ″ is woven into the design at two places by the warp yarns 8 and 23, forming a long crimp of 14 warp yarns between the warp yarns 8 and 23. Short crimps for eight warps are formed between the weaving portions shown in the complete design drawing repeated to the left.

In the embodiment shown in FIG. 5, the weaving position of the lower weft of the adjacent warp is different. The lower weft is woven twice in a complete design, forming a long crimp for 14 warps and a short crimp for 8 warps. In this embodiment, since the number of weaving times of the lower weft is large, the rigidity of the woven fabric is large and the posture stability is excellent.

The embodiment of FIG. 6 shows the complete design of a woven fabric of 24 warp 24 shaft wefts.

The upper weft 1 'in FIG. 6 is woven twice in the design by the warp 1 and the warp 20. Then, a long crimp for 18 warps is formed between the warp 1 and the warp 20, and a short crimp for four warps is formed between the warp 1 and the warp portion shown in the complete design drawing which repeats to the right or left of the complete design drawing. Crimp is formed.

The upper weft 2 'is woven twice in the design with the warp 1 and the warp 6. And, between warp 1 and warp 6, warp 4
A short crimp for this is formed, and a long crimp for 18 warp yarns is formed between the short crimp and the weaving portion shown in the complete design drawing which repeats to the right or left of the complete design drawing. The long crimp of the upper weft 1 'and the short crimp of the upper weft 2' are adjacent to each other.

Similarly, the other upper wefts 3 'to 24' also form a short crimp for four warps and a long crimp for 18 warps. It can be seen that the adjacent upper weft is adjacent to the short crimp and the long crimp.

The warp 1 passes over the upper wefts 1 ', 2' and weaves the two adjacent upper wefts into the design. The lower wefts 5 "and 23" are woven into the design.

Further, the warp 2 is woven into the structure by passing over three adjacent upper wefts 6 ′ and 7 ′, which are three adjacent to the upper weft 2 ′ woven by the warp 1. And the lower weft 15 ″
23 "in the organization.

Similarly, each of the other 3 to 24 warp yarns is woven into the structure by passing over the next two adjacent upper weft yarns, three from the upper weft yarn woven by the adjacent warp yarn. And the lower layer weft is woven twice in the design.

In this way, each warp is woven into the structure by passing over three adjacent upper wefts, three of which are placed from the upper weft woven by the adjacent warp, so that the adjacent warps form the crimp formed on the papermaking surface. The regularity is broken and the generation of wire marks is prevented. The papermaking surface has a flat surface formed by the long crimp of the weft, so that the weft does not sink between the warps on the papermaking surface. Further, as described above, it is understood that the long weft crimp is always interposed between the crimps formed by the adjacent warps on the papermaking surface, thereby preventing the fibers from being stuck.

The lower weft 1 ″ is formed by a pair of warps 4, 5 and 11, 12
It is woven into a round design, forms a short crimp of 5 warps between a pair of warps 4, 5 and 11, 12 and is shown in the complete design drawing that repeats to the right or left of this complete design drawing. A long crimp for 15 warp yarns is formed between the woven portion and the woven portion.

In this embodiment, since the lower layer weft is woven twice by a pair of adjacent warps, the lower layer weft is woven many times, the stiffness of the fabric is large, and the posture stability is excellent.
Moreover, it is understood that the crimping property of the lower weft is very good, and a thicker weft can be used. Due to the formation of the very long crimps, the wear-resistant volume can be very large.

7 to 9 are cross-sectional views of the papermaking fabric of the present invention, but also include a part of the complete structure which is repeated next to the fabric for convenience of explanation. For example, the warp yarns 19 to 27 in FIG. 7 are the warp yarns shown by the complete structure repeated next to each other, and are shown here.

FIG. 7 is a sectional view of the papermaking fabric of FIG. 1 taken along the line II ′. The upper layer weft 7 'is woven with warps 2 and 13, forming a long crimp of 10 warps on warps 3 to 12 and a short crimp of 6 warps on warps 14 to 19. I have.

On the other hand, the lower layer weft 7 ″ is woven into the structure by a pair of warps 7 and 8, forming a long crimp for 16 warps between the pair of warps 25 and 26.

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

On the other hand, the lower weft 17 ″ is a pair of warps 1, 2, and 12, 13,
And woven into the fabric at 19, 20, and a pair of warps 1, 2,
A long crimp of nine warps is formed between 12, 13 and a short crimp of five warps is formed between a pair of warps 12, 13, and 19, 20.

FIG. 9 is a sectional view of the papermaking fabric of FIG. 3 taken along the line III-III '. The upper layer weft 1 'is woven with warps 1, 14, and 23 to form a long crimp for 12 warps on warps 2 to 13 and a short crimp for 8 warps on warps 15 to 22. ing.

On the other hand, the lower weft 1 ″ is a pair of adjacent warps 3, 4 and 2
It is woven into the structure at 5, 26 to form a long crimp for 20 warps.

From the cross-sectional views of FIGS. 7 to 9, the papermaking fabric of the present invention is formed of crimps in which the length of the upper weft is alternately arranged on the warp in a bridging manner on the warp, and the flat surface is flat. It can be seen that the wire mark is prevented. In addition, a long crimp of lower weft is formed on the running surface,
It can be seen that the wear resistance has been increased.

FIG. 10 is a complete design diagram showing a conventional 16-shaft weft double woven fabric.

The upper weft 1 'in FIG. 10 is composed of warp 3, warp 6, and warp 11
And the warp 14 is woven into the fabric four times. And
Between warp 3 and warp 6 and between warp 11 and warp 14, warp 2
Crimps for four warps are formed between the warps 6 and the warp 11 and between the woven portions shown in the complete design drawing repeated to the right or left of the complete design drawing. .

The upper weft 2 'is a warp 1, a warp 6, a warp 9, and a warp 9.
It is woven into the tissue four times at 14. Then, a short crimp for two warps is formed between the warp yarns 6 and the warp yarns 9 and between the woven portions shown in the complete design drawing which repeats to the right or left of the complete design drawing. The upper weft 2 'forms a crimp for four warps between the warp 1 and the warp 6 and between the warp 9 and the warp 14.

Similarly, the upper wefts of the other 3 'to 16' also form a crimp for four warps and a short crimp for two warps, respectively.

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

FIG. 11 is a cross-sectional view of the conventionally known 16-shaft woven fabric of FIG. 10 taken along the line IV-IV ′, showing a state in which the upper layer weft is woven into the structure by the warp. The upper layer weft 3 'is woven into the design four times by warps 1, 4, 9 and 12 and is pushed down. On the other hand, the warp yarns 2 and 3 push the upper weft yarn 3 'upward, but the upper weft yarn 3' sinks below the position connecting the upper surfaces of the warp yarns 1 and 4,
Thus, it can be seen that when the crimp of the upper layer weft is only two warps long, the recess 26 is formed on the papermaking surface, and the stock sneaks into it to generate a wire mark. In FIG. 7, which is an embodiment of the present invention, the crimp of the upper weft has a shorter crimp length, which is six warps in length. In this case, the upper weft does not sink and the papermaking surface is smooth. It is understood that.

[Effects] Next, the results of comparative tests on specific woven fabrics will be shown to explain the effects of the present invention.

Comparative Test 1 A comparative test between the papermaking fabric (Example 1) having 18 upper wefts of the warp 18 shaft of the present invention shown in FIG. 1 (Example 1) and the conventional 16 shaft papermaking fabric (Comparative Example 1) shown in FIG. Table 1 shows the results
Shown in All the yarns used were monofilaments.

[Brief description of the drawings]

1 to 6 are complete design drawings showing an embodiment of the present invention. FIG. 7 is a cross-sectional view of the woven fabric of FIG. 1 taken along the line II ′, and FIG. 8 is a cross-sectional view of the woven fabric of FIG. 2 taken along the line II-II ′. FIG. 9 shows the fabric of FIG.
FIG. 3 is a cross-sectional view taken along the line I-III ′. FIG. 10 is a complete design diagram of a conventional 16-shaft weft double papermaking fabric. FIG. 11 is a cross-sectional view of the woven fabric of FIG. 10 taken along the line IV-IV ′. The x in the drawing indicates the position where the warp is above the upper weft, and the x also indicates the position where the upper weft is woven into the structure by the warp. In addition, は indicates a position where the lower layer weft is woven into the structure by the warp. 1 to 24 warp 1 'to 24' upper weft 1 "to 23" (odd number) lower weft

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-2-74691 (JP, A) JP-A-2-74692 (JP, A) JP-A-2-145886 (JP, A) JP-A-2-746 145887 (JP, A) JP-A-2-145888 (JP, A) JP-A-2-145889 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D21F 1/00 D03D 11 / 00

Claims (8)

(57) [Claims] 1. Weft yarns are arranged in upper and lower two layers.
(N = 0, 4 or 6) shaft, upper layer weft is 18 + n
In a book fabric, the number of upper wefts is twice the number of lower wefts, and each upper weft alternates over a different number of warps to form alternately long and short crimps, adjacent to each other. A long crimp and a short crimp are adjacent to each other between the upper wefts. The warp has a structure in which one warp passes over two adjacent upper wefts in a repeating pattern of (18 + n) upper wefts. The next adjacent warp is woven into the structure by passing over the next two upper wefts, three of which are placed from the two upper wefts over which the first warp has passed, and so on in the same manner as in the case of 18 + n A complete design woven into the design up to the second warp is formed on the papermaking surface, and the lower weft is disposed every other upper weft, and each warp is an upper weft (18 + n)
A double woven fabric for papermaking, wherein a lower layer weft is woven into a structure at least once between the books. 2. A woven fabric having 18 upper wefts and 18 shafts of warp, and a long crimp formed by each upper weft is 10 warp.
The papermaking double woven fabric according to claim 1, wherein the short crimp is the main thread and the short crimp is the length of the six warps. 3. A woven fabric having 22 upper weft yarns and 22 warp yarns, and the upper crimp formed by each upper weft yarn has a length of 12 warp yarns.
The papermaking double woven fabric according to claim 1, wherein the short crimp is the main thread, and the short crimp is the length of the eight warps. 4. A woven fabric having 24 upper weft yarns and 24 shaft warp yarns, and a long crimp formed by each upper weft yarn is 18 warp yarns.
2. The papermaking double woven fabric according to claim 1, wherein the short crimp is the main thread and the short crimp is the four warps. 5. The papermaking double fabric according to claim 1, wherein a long crimp of lower weft is formed on the running surface. 6. The papermaking double woven fabric according to claim 1, wherein the lower weft is a weft thicker than the upper weft. 7. The double woven fabric for papermaking according to claim 1, wherein the lower weft on the running surface comprises a polyamide weft and a polyester weft. 8. The papermaking double woven fabric according to claim 1, wherein the lower weft of the running surface is a polyamide weft thicker than a polyester weft.