JP3474039B2 - Double layer fabric for papermaking - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a papermaking fabric.

[0002]

2. Description of the Related Art There are more requirements than ever before for papermaking fabrics. For example, improving surface smoothness and fiber support of the paper stock to prevent wire marks from occurring and improving the yield of papermaking, improving abrasion resistance to extend the service life of the fabric, good running rigidity , Improved posture stability, dimensional stability, good
It is to secure water and small water retention. These requirements are often related to each other and are not problems that should be considered separately, but roughly speaking, the requirements of are mainly related to the paper-making side of the fabric, and the requirements of are mainly related to the running of the fabric. This is a problem concerning the face side, and the requirement of is mainly a problem concerning the overall structure of the fabric. Many proposals have been made in the past in order to meet the demand for the above-mentioned papermaking fabric. However, at present, there is still no satisfactory solution. For example, in order to solve the requirement, it is conceivable to use a fine thread for finely weaving to form a smooth paper-making surface. However, since such a paper-making fabric has a fine thread, the required abrasion resistance and the required However, the rigidity and posture stability are poor. Further, in order to improve the fiber supporting property of the paper stock, an attempt has been made from a woven structure such as forming the paper making surface with a weft. When the papermaking surface is formed with wefts, the fibers of the stock do not block the water space between the warp yarns.
Ro ▼ The water is also good. Specifically, auxiliary wefts are arranged between the original wefts, etc., which are effectively carried out with a single weave and a double weave, but even in that case, it cannot be said that the level is sufficiently satisfactory. . On the other hand, in order to improve the required abrasion resistance, conventionally, a method of preventing abrasion of the warp has been implemented as a weft abrasion type in which the running surface side of the papermaking fabric is formed of weft. In general, it is preferable that the weft yarn has an abrasion resistance effect from the viewpoints of extending the service life of the woven fabric in use, and improving the posture and dimensional stability. When the warp is worn, the tensile strength is naturally lowered and the woven fabric is stretched. When the abrasion further progresses, the fabric cannot endure the tension at all and the fabric itself is directly cut, and the service life is exhausted. or,
From the viewpoint of the material of the thread, a method of using a polyamide thread, which has more abrasion resistance than polyester, for the weft thread on the running surface side has been carried out, but it is simply using the performance of the material used. The effect is not obtained for a period of time. On the other hand, the use of polyamide yarn has a drawback that the required rigidity and posture stability are deteriorated, and it is only used by alternately arranging it with polyester yarn.

It has also been attempted to use a yarn having a large wire diameter as the weft yarn on the running surface, and some improvements have been made, but the balance between the weft yarn and the warp yarn is lost, the crimping property is deteriorated, and the required wire mark is obtained. There were many problems in practical use due to the drawbacks such as prevention of occurrence. Request as above,
Has a conflicting problem, that is, a problem of request occurs when trying to solve the request. Therefore, in order to solve the above-mentioned problems, a paper-making surface side and a running surface side are configured by using different warp threads and weft threads, respectively, and a two-layer upper and lower woven fabric in which both woven fabrics are integrated by binding yarns is used. Has also been attempted. That is, a smooth papermaking surface is formed by using warp yarns and weft yarns with a small wire diameter on the papermaking surface side fabric, and warp and weft yarns with a large wire diameter are used on the running surface so that it has high wear resistance and rigidity. It forms a running surface. However, these proposals have not always been satisfactory. Because, in the knotting portion where the binding yarn and the warp or weft of the papermaking side fabric intersect, the binding yarn draws the papermaking side fabric to the running surface side, so that a dent occurs on the papermaking side fabric surface, This dent mark is generated as a wire mark so as to be transferred to paper. Japanese Patent Publication No. 5-77795 is proposed as a solution to the generation of the wire mark. This proposal is a novel proposal in that the total of the bonding forces is distributed up to the maximum number of the bonding points, and the load of each single bonding part is minimized to prevent the generation of wire marks. There are many cases, and it is the situation that it is not yet in general use. The drawbacks of the prior art will be specifically described later with reference to the drawings. Also, new problems have recently arisen. In recent years, as the demands on papermaking such as the speeding up of papermaking speed, the use of fillers and the need for neutral papermaking have become more and more severe, internal wear occurring inside the fabric has become a serious problem.

The upper and lower two-layer woven fabric using the conventional binding yarn is
As disclosed in Japanese Examined Patent Publication No. 5-77795, the binding force of the binding yarn is made small in order to make the depression of the binding portion due to the binding yarn as small as possible. However, there was a big problem here. Since the upper and lower two-layer woven fabrics are different in the upper and lower woven fabrics, a dimensional difference occurs due to a difference in shrinkage amount during heat setting, or a dimensional difference occurs due to a difference in shrinkage force and shrinkage amount in the weft direction with respect to tension in the warp direction. .
Further, when the rolls are run between the rolls on the paper machine, a dimensional difference occurs between the woven fabric located on the outer side and the woven fabric located on the inner side in the roll rotating portion. In the upper and lower two-layer fabric, this dimensional difference is constrained by the binding yarn,
Since the upper and lower two-layer fabric of Japanese Examined Patent Publication No. 5-7779 has a weak binding force, it cannot keep up with this dimensional difference during use, and the binding yarn stretches and is worn such that it is caught between the upper and lower fabrics, and the upper side The lower side of the woven fabric, the upper side of the lower woven fabric and the binding yarn are worn, the binding force is further reduced, and a gap is generated between the upper and lower woven fabrics or the dimensional difference is eliminated, so that the width direction is increased. Waveform wrinkles occur. Wavy wrinkles in the width direction not only cause abnormal wear during use, but also affect the water quality, causing marks on the paper and variations in the basis weight of the paper in the width direction, so-called BD. It causes a profile defect. Further, when the internal wear further progresses, the upper and lower fabrics may eventually separate.

In addition, since the conventional upper and lower two-layer woven fabric has a small binding force, the woven fabric becomes thick and the water retention becomes large. Therefore, when the fabric is rotated at a high speed on the paper machine, the fold-back rotary portion is used. The problem is that the water contained in the woven fabric scatters as water drops due to the centrifugal force and drops on the wet paper, causing marks on the paper.

[0006]

In view of the above problems of the prior art, the present invention has a very strong binding force, and
(EN) A two-layer papermaking fabric for papermaking, in which no denting of the binding portion due to the binding yarn occurs, the surface is smooth, the fiber retention of the paper material is good, and the fabric thickness is thin and the water retention is small. That is, the present invention aims to solve all the problems of the conventional two-layer fabric for papermaking.

[0007]

Means for Solving the Problems The present invention is directed to "1. Paper-making-side fabric woven into a plain weave structure by a paper-making-side warp and a paper-making-side weft; The running surface side fabric woven in a weft wear type whose side is formed by a long crimp of the weft yarn, and the paper manufacturing side fabric and the running surface side by intersecting the upper side of the paper side warp and the lower side of the running side warp. In a two-layer papermaking fabric for papermaking, which comprises a binding weft that binds to a woven fabric, each binding weft has a papermaking side binding portion formed by intersecting one papermaking side warp on the upper side,
A papermaking side fabric and a running surface, which are formed every three papermaking side warps and intersect at the lower side of the running surface side warps between the papermaking side side binding parts to form a running side knot. A binding weft yarn for binding side fabrics, wherein the binding weft yarns are arranged adjacent to each other in a ratio of one weft yarn on all paper-making side, and all binding portions on the paper-making side and the paper-making side A two-layer woven fabric for papermaking in which side weft knuckles and a side weft knuckle are formed adjacent to each other in the warp direction. 2. 1. The paper-making-surface-side weft knuckle is a knuckle in which a paper-making-surface-side weft thread crosses over one paper-making-surface-side warp and weaves warps into a tissue, and is formed every other paper-making-surface-side warp. The described two-layer fabric for papermaking. 3. The binding weft is arranged adjacent to both sides of the paper-making side weft,
The two-layer fabric for papermaking according to item 1 or 2. 4. The two-layer fabric for papermaking according to any one of items 1 to 3, wherein the number of papermaking surface side warps and the number of running surface side warps are the same, and the number of papermaking surface side wefts is the same as the number of running surface side wefts. 5. The papermaking according to any one of claims 1 to 4, wherein the running surface side fabric is a 3/1 twill weave design that forms a long crimp of running surface side wefts for three running surface side warps on the running surface side. Double-layered fabric. 6. 5. The papermaking product according to any one of items 1 to 4, wherein the running surface side fabric has a 7/1 design on the running surface side to form long crimps of running surface side warps for seven running surface side warps. Two layer fabric. 7. The intersection where the running surface side weft intersects above the running surface side warp and the running surface side binding part where the binding weft intersects below the running surface side warp are arranged not adjacent to each other in the warp direction. Was done,
The two-layer fabric for papermaking according to any one of items 1 to 6. 8. The binding weft is a polyamide monofilament,
A two-layer fabric for papermaking according to any one of items 1 to 7. Regarding

In the case of a papermaking fabric, it is ideal to form the papermaking side with a plain weave design. The plain weave design is a design in which warp yarns and weft yarns intersect each other, and knuckles of warp yarns and weft yarns are alternately formed. Therefore, the number of weft yarns and warp yarn knuckles that hold the fibers of the paper stock is different from that of the other design. Most of them are evenly arranged in the same plane at the same level. Therefore, the surface property of the papermaking surface is improved, and the surface of the paper to be paper-made can be made smooth. However, in the case of a single-woven fabric having a plain weave structure, the running surface side also has a plain weave structure, so that the warp is immediately worn away, and there is a problem in wear resistance. Therefore, using a plain weave design for the papermaking side fabric, an upper and lower two-layer fabric using a wear-resistant design for the running face side fabric was conceived. There were problems such as internal wear and water retention.

According to the present invention, two paper-making surface side woven fabrics formed in a plain weave design and a running surface side woven fabric formed in a weft-wear type are arranged adjacent to the paper making surface side wefts, and all the papermaking is performed. It was possible to solve the above-mentioned problems by strongly binding the adjacent weft knuckles on the surface side.

The knuckle is an intersection formed by the warp yarn and the weft yarn intersecting with each other. In the present invention, it is defined as follows. On the paper-making side, the name of the yarn that crosses the upper side of the other side of the warp or weft is attached to the knuckle. Therefore, the knuckle where the papermaking surface side warp intersects with the papermaking surface side weft yarn is a papermaking surface side warp knuckle, and the knuckle where the papermaking surface side weft intersects above the papermaking surface side warp is a papermaking surface side weft knuckle. On the other hand, on the running surface side, the name of the yarn that intersects with the lower side of the opposite yarn of the warp yarn or the weft yarn is attached to the knuckle. Therefore, the knuckle where the running surface side warp intersects below the running surface side weft is a running surface side warp knuckle, and the knuckle where the running surface side weft intersects below the running surface side warp is a running surface side weft knuckle. . A crimp is defined between the knuckles. Therefore, a crimp of the weft is formed between the warp knuckle formed by different warps on the same weft, and a crimp of the warp is formed between the weft knuckle formed by different wefts on the same warp and the weft knuckle. To be done.

The binding yarn which binds the upper and lower two fabrics of the present invention is a weft yarn. The two-layer woven fabric includes a warp binding woven fabric having binding yarns along the warp and a weft binding woven fabric having binding yarns. The woven fabric of the present invention is a weft binding woven fabric. The joining yarn of the present invention is a binding weft yarn. A first feature of the present invention is that a binding yarn for binding a papermaking side fabric and a running face side fabric is arranged adjacent to every one papermaking side weft yarn at a ratio of two to form one papermaking machine. The papermaking surface side knots formed by crossing over the surface side warps are formed every three papermaking surface side knots, and the papermaking surface side knots must always intersect below the running surface side warp between the papermaking surface side knots. That is, the running surface side connecting portion is formed, and all the paper making surface side connecting portions and all the paper making surface side weft knuckles are arranged adjacent to each other in the warp direction in a one-to-one correspondence. When the papermaking surface side binding part and the papermaking surface side weft knuckle are placed next to each other, both yarns pass over the same warp and form a knuckle of the same structure, so the papermaking surface side binding part and the papermaking side weft knuckle are Close to each other. Therefore, two binding yarns are arranged adjacent to each other on one papermaking side weft yarn. When the binding portion is formed as described above, all the paper-making-surface-side weft knuckles are pulled into the running surface with the same force, and the paper-making-surface-side warp knuckles are all affected by the same force. It is possible to obtain a smooth paper-making surface in which the whole is drawn in uniformly, there is no dent due to the binding yarn, and wire marks are not generated. Details will be described in detail with reference to the drawings in the embodiments and comparison with the conventional example.

Further, since the number of binding portions is the same as the number of weft knuckles on the paper-making side, which is much larger than that of the conventional example, the binding force is strong and the fabric on the paper-making side and the fabric on the running side are strong in one piece. Unlike the upper and lower two-layer woven fabric, which has a weak binding force, the binding yarn stretches and internal wear occurs, or a gap occurs between the papermaking side fabric and the running face side fabric. Wavy wrinkles do not occur. Further, since the binding force is strong, it is possible to reduce the thickness of the woven fabric and reduce the water retention.

In the present invention, the number of papermaking surface side warps and the number of running surface side warps, the number of papermaking side wefts and the number of running surface side wefts are the same, and the running side fabric is woven with 3/1 twill and further knotted. The yarns should be placed on both sides of the weft on the paper making side, and the crossing point where the wefts on the running side intersect above the warp on the running side should not be adjacent to the knot on the running side. Is preferred. The first feature of the present invention is that the above-described binding yarns are used to form the same number of paper-making surface-side binding portions as all the paper-making surface-side weft knuckles, which is much larger than the conventional one. Therefore, although the sufficiently excellent effect as described above can be obtained, the same number of running surface side connecting portions are naturally formed between the paper making surface side connecting portions.

When the running surface side binding portion where the binding yarn crosses under the running surface side warp is formed as described above, the running surface side woven fabric is a 3/1 twill weave or a multiple thereof. Except for the design in which the weaving portion is reduced, for example, the design in which the running surface side binding part and the running surface side weft intersect above the running surface side warp, that is, the running surface side warp A part where the knuckle and the knuckle are adjacent to each other is formed. If these adjacent portions are formed, the surface smoothness of the paper-making surface and the abrasion resistance of the binding yarn will be somewhat affected. For example, it is possible to dispose two binding yarns adjacent to one side of the paper-making side weft yarn. However, when two binding yarns are arranged adjacent to each other, two binding yarns overlap and one binding yarn is formed. Is formed. Therefore, the running surface side knots are formed every other warp, and a portion adjacent to the intersection where the running surface side wefts intersect above the running surface side warps is also formed.

The crossing point where the running surface side weft intersects with the running surface side warp on the upper side is, of course, the position where the running surface side warp weaves the running surface side weft from below and the running surface side warp is Since it is the portion located on the most traveling surface side, the traveling surface side connecting portion adjacent to this is also compared to other traveling surface side connecting portions,
It will be located on the running surface side. Therefore, this binding yarn pulls the papermaking surface toward the running surface with a slightly stronger force than the other binding yarns. Will end up. In addition, it will be worn before the other running surface side joints. When the binding yarn is worn out, the binding strength is lowered, so that the conventional problems occur and the service life is exhausted. However, the binding yarn begins to wear because the running surface side weft wears first and then the running surface side warp wears, and this wear progresses considerably, so that it affects wear resistance. Even so, it is a problem in a very short period from the end of the service life of the fabric. Therefore, as described above, the running surface side connecting portion and the running surface side warp knuckle should not necessarily be adjacent to each other, but it is preferable to avoid them. As described above, the present invention has a sufficiently excellent effect due to the first characteristic, but can further exhibit a better effect by further limiting the tissue.

The wire material used in the papermaking fabric of the present invention is not particularly limited, and various synthetic resins such as polyester, polyamide, polyphenylene sulfide can be used, and the wire structure can be monofilament, multifilament, etc. However, due to the rigidity and abrasion resistance of the woven fabric, warp yarns, polyester monofilaments for paper side wefts, polyester filaments and polyamide monofilaments for running side wefts are used together, and the binding yarns are resistant to internal wear and For the purpose of strengthening the binding strength, it is preferable to use a polyamide monofilament which has a large heat shrinkage and is hard to stretch. It is also preferable to use polyphenylene sulfide monofilament when it is used at high temperature.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be specifically described with reference to the drawings in comparison with a conventional example. FIG. 1 is a design diagram showing the complete design of the embodiment of the present invention. In the design drawing, a cross indicates a portion where the paper-making side warp intersects with the paper-making side weft. That is, in the present invention,
The paper-making-surface-side warp knuckle is shown, and the part without X indicates the paper-making-surface-side weft knuckle. A circle indicates a portion in which the running surface side warp intersects and weaves under the running surface side weft. The ▲ mark indicates the paper-making surface side connecting part, and the Δ mark indicates the running surface side connecting part. or,
The papermaking side warp and the running side warp overlap vertically and are indicated by Arabic numerals without dashes. The papermaking side weft and the running side weft also overlap vertically and are indicated by Arabic numerals with dashes. The yarns which are vertically overlapped are indicated by the same reference numerals. The binding thread is shown in Arabic numerals with a double dash.

Looking at the fabric on the papermaking side with reference to FIG. 1,
The papermaking surface side weft 2 ′ passes over the papermaking surface side warp 1 and then under the papermaking surface side warp 2 to form a plain weave, and then passes over the papermaking surface side warp 3 and then the papermaking surface. A second plain weave design is formed through the lower side of the side warp yarns 4. The papermaking surface side weft knuckle is formed of a papermaking surface side warp 1 and a papermaking surface side warp 3. The papermaking surface side weft 5 ′ passes under the papermaking surface side warp 1 and then over the papermaking surface side warp 2 to form a plain weave structure, and then passes under the papermaking surface side warp 3 and then the papermaking surface side warp 3. A second plain weave design is formed by passing above the surface side warp 4. The papermaking surface side weft knuckle is formed by the papermaking surface side warp 2 and the papermaking surface side warp 4. Similarly, two plain weave designs are formed for the papermaking surface side wefts 8'and 11 ', and the papermaking surface side weft knuckles are formed by the papermaking surface side warp yarns 1 and 3 and the papermaking surface side warp yarns 2 and 4, respectively.
Also, the paper-making side warps 1, 2, 3, 4 are the same as the paper-making side wefts.
Two plain weave structures are formed. For example, the papermaking side warp 1
Passes under the papermaking surface side weft 2 ', then passes over the papermaking surface side weft 5'to form a plain weave, then passes under the papermaking surface side weft 8', and then the papermaking surface side weft 11 A second plain weave structure is formed through the upper side of ′. As described above, in this embodiment, four plain weave designs are formed in the complete design, two in the warp direction and four in the weft direction. Two weft knuckles on the side of the papermaking side are formed in the plain weave structure, so that a total of eight knuckles are formed.

Looking at the running surface side fabric, the running surface side weft 2'is woven from below by the running surface side warp 4, and the running surface side warps 1, 2 and 3 are three running surface side warps. A long crimp of the running surface side weft is formed. Similarly, the running surface side wefts 5 ', 8', and 11 'also form long crimps of the running surface side wefts for three running surface side wefts. The running surface side warp passes through the upper side of three continuous running surface side wefts and then under the one running surface side weft to form a 3/1 design. For example, with respect to the running surface side warp 1, the warp passes through the upper side of the running surface side wefts 2 ', 5', 8 ', and then passes under the running surface side weft 11' 3 /
It forms one tissue. As described above, in this embodiment, one 3/1 structure is formed in the complete structure. The 3/1 design is a twill weave formed by shifting the warp by one weft.

Next, regarding the binding yarns, the binding yarns 1 "and 3" and the papermaking surface side weft 5'are provided on both sides of the papermaking side weft yarn 2 '.
4 "and 6" are arranged on both sides of each of the two, the binding yarns 7 "and 9" are arranged on both sides of the papermaking surface side weft 8 ', and the binding yarns 10 "and 12" are arranged on both sides of the papermaking surface side weft 11'. It is understood that the binding yarns are arranged on both sides of all the weft yarns on the paper making side. The binding yarn 1 ″ intersects with the upper side of the papermaking surface side warp 1 to form a papermaking surface side binding portion, and then the papermaking surface side warp 2 and the running surface side warp 2
After passing between the paper-making side warp 4 and the running-side warp 4 after crossing the warp 3 under the running-side warp 3 to form a running-side knot. , The papermaking surface side warp 1 of the next complete design is crossed to form a papermaking surface side binding portion. In this way, the binding yarn 1 ″ forms the paper-making-surface-side binding portion at every three paper-making-surface-side binding yarns of the paper-making-surface-side warps 2, 3, and 4, and runs between the paper-making-side binding portions. It is understood that the running surface side knot is formed at the position of the surface side warp 3.

The binding yarn 3 "intersects below the running surface side warp 1 to form a running surface side binding portion, and then the papermaking surface side warp 2
After passing between the running surface side warp 2 and the running surface side warp 2, the paper manufacturing surface side warp 3 is intersected with the warp to form a paper manufacturing surface side knot, and then the paper manufacturing surface side warp 4 and the running surface side warp 4 After passing through the space, the papermaking surface side knotting portion is formed below the running surface side warp 1 of the next complete design by intersecting the warp. In this way, the binding yarn 3 "
Also, the paper-making-surface-side knots are formed between the paper-making-surface-side warp 4, the paper-making-surface-side warps 4 and the paper-making-surface-side warps 1 and 2 of the following complete design, which are between the paper-making-side knots. It is understood that the running surface side binding portion is formed at the running surface side warp 1.
Further, the papermaking surface side binding portion of the binding yarn 1 ″ is adjacent to the papermaking surface side weft knuckle formed by the papermaking surface side warp 1 of the papermaking surface side weft 2 ′, and the binding yarn 3 ″ of papermaking. The surface-side connecting portion is formed adjacent to the paper-making-surface-side weft knuckle formed by the paper-making-surface-side warp 3 of the paper-making-surface-side weft 2 '. It is understood that the papermaking surface side binding portion is adjacent to all the knuckles, and the binding yarn 1 ″ and the binding yarn 3 ″ are adjacently arranged along the papermaking surface side weft yarn 2 ′.

Similarly, the binders 4 "and 6" on the papermaking side are formed adjacent to all the weft knuckles on the papermaking side of the papermaking side weft 5 ', and the binders 7 "and 9" are formed. The paper-making surface-side connecting portion is formed adjacent to all the paper-making-surface-side weft knuckles of the paper-making-surface-side weft 8 ', and the paper-making-surface-side connecting portions of the binding yarns 10 "and 12" are the paper-making-side weft 11 The papermaking surface side weft knuckle is formed adjacent to all the papermaking surface side weft knuckles, and all the papermaking surface side weft knuckles are formed adjacent to each other in the warp direction in a one-to-one correspondence. Is understood. In this way, all binding parts are adjacent to all of the weft knuckles on the papermaking surface side and are pulled into the tissue with the same force, so there is no dent due to the drawing of the binding yarn, and a smooth papermaking surface that does not generate wire marks is formed. It is possible to obtain a two-layer woven fabric for papermaking having a strong binding force.

Further, in the present embodiment, the running surface side connecting portion of the connecting yarn is formed at the center position between the paper making surface side connecting portions, but it is not limited to this, and for example, the connecting portion is formed. It is also possible to form the running surface side knot of the yarn 1 ″ in the running surface side warp 2. The angle of the binding yarn from the paper making surface side knotting part to the running surface side knotting part is thus changed. It is not symmetrical to the left and right, and the angle on one side becomes tighter, and the force that tries to mitigate this is working, and the warp on the paper making side moves slightly to the left and the warp on the running side moves slightly to the right, so the latest It is suitable for slow dewatering in a paper machine with high speed and large dewatering power, and also has an advantage that the thickness of the fabric can be reduced and the water retention can be reduced. An intersection where the running surface side binding part and the running surface side weft intersect above the running surface side warp, that is, running Since the side warp knuckles are not adjacent to each other in the warp direction, the running surface side connecting portion is not arranged in the portion located closest to the running surface side, does not affect the wear resistance, and is adjacent. Since the binding yarn does not coexist with the above-mentioned portion, all the forces for pulling the binding yarn to the paper-making surface are the same, and the surface smoothness is good, which is a preferred embodiment of the present invention as described above.

In the design drawing, the mark "○" indicating the portion where the running surface side warp intersects with the lower side of the papermaking surface side weft and the mark "△" indicating the running surface side connecting portion are not adjacent in the warp direction. Understand better. In addition, in FIG. 1, as described above, the running surface side connecting portion,
The running surface side weft is not adjacent to the intersection of the running surface side warp above the running surface side warp in the warp direction, but the invention is not limited to this. For example, the binding yarn 3 ″ shown in FIG. The binding yarn 6'is disposed between the surface side weft 2'and the binding yarn 1 ", and the binding yarn 6" is positioned between the papermaking side weft 5'and the binding yarn 4 ".
It is also possible to dispose between the weft yarn 8'on the papermaking side and the binding yarn 7 ", and the binding yarn 12" between the weft yarn 11 'on the papermaking side and the binding yarn 10'. However, with this design, the binding yarns 1 ″ and 3 ″ are formed so as to be exactly adjacent to each other and substantially like one yarn, and are arranged adjacent to one side of the papermaking surface side weft yarn 2 ′. Therefore, the running surface side binding part of the binding yarn 3 ″ and the crossing part where the running surface side weft 11 ′ of the next design drawing intersects above the running surface side warp yarn 1 are substantially adjacent to each other, and the running A part where the surface-side knotted portion and the running surface-side warp knuckle are substantially adjacent to each other in the warp direction occurs, although the warp and weft of the running surface-side fabric are the same as those of the paper-making surface-side fabric in FIG. The warp yarns and the weft yarns of the running surface side fabric may be coarser than the papermaking surface side fabric.

FIG. 2 shows a woven fabric in which the binding yarns of FIG. 1 are shifted a little, and has the same effect as that of the embodiment shown in FIG.

FIG. 3 is a complete design diagram showing another embodiment of the present invention. In FIG. 3, the number of the warp yarns and the weft yarns in the embodiment shown in FIG. 1 is doubled, and the running surface side wefts are woven from below by the running surface side warps. It is an organization. As a result, the running surface side woven fabric has a 7/1 design, and the running surface side weft yarn is the running surface side warp 7
A long crimp for the length is formed, and wear resistance is good.

FIG. 4 is a cross-sectional view of the woven fabric of the present invention taken along the line AA of FIG. It is understood that the papermaking surface side weft 2'forms a plain weave design, and the papermaking surface side weft knuckles are formed at the papermaking surface side warps 1 and 3, and the running surface side weft 2'runs to the running surface side. It is understood that a long crimp corresponding to three face side warps is formed. Further, regarding the binding yarn, the binding yarn 1 ″ is arranged adjacent to the front side of the weft yarn 2 ′ on the paper making side, and the binding yarn 3 ″ is arranged adjacent to the back side. The surface side warp 1 is used to make paper surface side warp 2, 3, 4
The paper-making-surface-side knots are formed every three paper-making-surface-side knots, and the running-surface-side knots are formed by the running-surface-side warp 3 between the paper-making-surface-side knots.

The binding thread 3 "is a portion of the paper-making surface-side warp 3, and a paper-making-surface-side binding portion is formed at every three paper-making-surface-side warp threads 4, 1 and 2 to form a paper-making-surface-side binding portion. Running surface side warp 1 between parts
It is understood that the running surface side connecting portion is formed at the portion of. As a result, the binding yarn 1 ″ pulls the papermaking surface side warp 1 toward the running surface side, and the binding yarn 3 ″ pulls the papermaking surface side warp 3 toward the running surface side, whereby the papermaking surface side warp 1 and the papermaking surface side The papermaking surface side weft knuckle formed on the warp 3 is pulled in, and as a result, all the papermaking surface side weft knuckles are pulled in by the two binding yarns 1 ″ and 3 ″. Further, since the binding yarns 1 ″ and 3 ″ have the same structure, it is understood that all knuckles are pulled in with the same force and are formed at the same height.
Further, the influence of the binding yarns on the paper-making side warp yarns 2 and 4 is that the binding yarns 1 ″,
3 ″ is on the way down to the running surface side and intersects with each other, and is hardly affected.
Further, even if received, since the force is the same, the papermaking surface side warps 2, 4 are also formed at the same height. Therefore,
All the paper-making-surface-side warp knuckles and the paper-making-surface-side weft knuckles are drawn to the running surface side with the same force, and a smooth paper-making surface free from any dent due to the binding yarn can be obtained. Also, since the number of connecting parts is very large, the connecting force is also very strong.

FIG. 5 is a cross-sectional view of a two-layer paper fabric for papermaking, in which the number of warp yarns on the running surface side, which is the most commonly used, is half that of the warp yarns on the papermaking surface side. The papermaking side fabric forms a plain weave,
On the running surface side, the running surface side fabric has long crimps for two running surface side warps. As can be understood from the drawings, the paper-making surface side weft comprises 6 paper-making surface side warps as a repeating unit. Usually, every two or four weft yarns on the papermaking side are arranged so that one weft yarn is adjacent to the weft yarns on the papermaking side. Further, as can be understood from the drawings, three paper-making surface-side weft knuckles are formed at the paper-making-surface-side warp yarns 1, 3, and 5 in the repeating unit, and the paper-making-surface-side connecting portion has the paper-making surface-side warp 1 It is formed only by the part.

Therefore, only the warp 1 on the papermaking side is the binding yarn 1 ".
As a result, the weft knuckle on the papermaking side is drawn in on the running surface side, and the weft knuckle on the papermaking side on the papermaking surface side is drawn in. However, the other warp yarns 3 and 5 on the papermaking side are binding yarns 1 ″.
Since it is not drawn in, a dent is formed in the vicinity of the papermaking surface side weft knuckle formed on the papermaking surface side warp 1, and as a result, a worm-like dent is generated on the entire papermaking surface and a wire mark is generated. Will end up. In addition, since the number of binding yarns is small and the number of binding portions per binding yarn is small, the binding force is small and the above-mentioned problems such as internal wear occur.

FIG. 6 is a cross-sectional view of a two-layer fabric for papermaking shown in Japanese Patent Publication No. 5-77795. For comparison with the present invention, an example was used in which the binding yarn was a weft yarn. The number of running surface side warps is half that of the paper making surface side warp, and both the paper making surface side woven fabric and the running surface side woven fabric are formed in a plain weave design.
Further, as can be understood from the drawings, the papermaking surface side weft comprises 8 papermaking surface side warps as a repeating unit. The binding yarns are formed by a set of two adjacent weft yarns, and a papermaking surface-side binding portion is formed at an adjacent portion on one side of all papermaking surface-side weft knuckles of one papermaking surface-side weft yarn. Arranged to form a knuckle. In this woven fabric, by arranging the binding yarns in this way, all the weft knuckles on the papermaking side are
By forming with a heavy knuckle, the purpose is to distribute the total binding force up to the maximum number of bindings, thereby minimizing each single binding force and minimizing the depression.

However, there is a serious problem in the design of the binding yarn. The binding yarn 1 ″ forms a papermaking surface-side binding portion at the portion of the papermaking surface-side warp yarn 2, and then passes under the papermaking surface-side warp yarn 3,
After forming the paper-making surface-side binding portion at the paper-making surface-side warp 4,
The running surface side warp 7 descends to the running surface side to form a running surface side knot. The binding yarn 2 ″ has a structure obtained by shifting the binding yarn 1 ″ by four paper-making surface-side warps, and the paper-making-surface-side warps 6 and 8 form a paper-making-surface-side binding portion. Certainly, the paper-making surface-side warps 2, 4 forming the paper-making-surface-side binding portion
6 and 8 are pulled in to the running surface side with substantially the same force, and the papermaking surface side weft knuckles formed thereon are also pulled in with substantially the same force to form the same height. However, there is a problem in the force that the warp yarns 1, 3, 5, 7 on the papermaking side receive from the binding yarn. In the papermaking surface side warp yarns 1 and 5, since the binding yarns 1 ″ and 2 ″ intersect with each other on the way to the running surface side, they are not affected so much. The portion 7 is a portion through which the binding yarn passes below while the binding yarn forms the paper-making surface-side binding portion, and is a portion which is pushed upward by the binding yarn. That is, the paper-making side warp 3 is pushed upward by the binding yarn 1 ″, and the paper-making side warp 7 is pushed upward by the binding yarn 2 ″. Therefore, the warp yarns 1 and 5 on the papermaking side are not drawn downward, but the warp yarns 2 and 6 are drawn downward, and the warp yarns 3 and 7 are also drawn.
Since it is pushed upward, a height difference occurs between the warp knuckles on the paper making surface side, which has the drawback of causing wire marks.

[0033]

EXAMPLES Next, the effects of the present invention will be concretely shown in comparison tests with conventional examples by showing examples.

Example 1 The two-layer papermaking fabric for papermaking shown in FIG. 1 in which the fabric for the papermaking side and the fabric for the running surface are made of the materials, wire diameters and densities shown in Table 1 and the binding yarns are the yarns shown in Table 1. .

COMPARATIVE EXAMPLE 1 The two-layer papermaking fabric for papermaking of FIG. 5 which is composed of the fabric, wire diameter and density shown in Table 1 and the binding yarn.

Comparative Example 2 A two-layer paper woven fabric for papermaking shown in Japanese Patent Publication No. 5-77795 of FIG. 6 which is composed of woven fabrics having the materials, wire diameters and densities shown in Table 1 and binding yarns.

[0037]

[Table 1]

(Note) * 1 Sheet smoothness: Smoothness (seconds) of fabric side of paper sheet by Beck's smoothness tester * 2 Peel strength: 80 mm with a cutter etc. after cutting the fabric into width 40 mm and length 300 mm. The upper and lower woven fabrics are separated by cutting only the binding yarn for a certain length, and the separated upper and lower woven fabrics are attached to the chuck of the tensile tester and pulled, and the strength of the upper and lower nets peeling is determined by the side-to-side comparison test results. It shows in Table 1. From the above comparative tests, the two-layer papermaking fabric for papermaking of the present invention shows extremely good results in sheet smoothness as compared with the conventional example, and also in peel strength,
Before the upper and lower woven fabrics were peeled off, the woven fabric on the paper-making side of the upper woven fabric broke, and the binding strength was so strong that the peeling strength could not be measured, and extremely excellent adhesion and binding force were exhibited.

[0039]

Industrial Applicability The present invention is a two-layer papermaking fabric for papermaking in which the papermaking side fabric is formed into a plain weave design, the running face side fabric is formed into a weft wear type, and both fabrics are integrated by binding yarns. In addition, there is no dent on the paper-making surface of the binding portion due to the binding yarn, the surface is smooth, and wire marks are not generated on the paper.
Further, the binding force is very strong, and internal wear does not occur, so that no space is generated between the papermaking side fabric and the running face side fabric, and wrinkles do not occur. Furthermore, since the binding force is strong, the fabric thickness can be reduced to reduce the water retention, and the problem of water droplets being scattered can also be solved.

[Brief description of drawings]

FIG. 1 is a design diagram showing a complete design of an example of the present invention.

FIG. 2 is a design diagram showing a complete design of another embodiment of the present invention.

FIG. 3 is a design diagram showing a complete design of another embodiment of the present invention.

FIG. 4 is a cross-sectional view of the complete tissue of FIG. 1 taken along the line AA.

FIG. 5 is a cross-sectional view of a conventional example.

FIG. 6 is a transverse sectional view of an example shown in Japanese Patent Publication No. 5-77795.

[Explanation of symbols]

1 warp 2 warp 3 warp 4 warp 5 warp 6 warp 7 warp 8 warp 1'weft 2'weft 3'weft 4'weft 5'weft 11 'weft 12 'weft 13 'weft 20 'weft 21 'weft 22 'weft 23 'weft 1 ″ binding yarn 2 ″ binding yarn 3 ″ binding yarn 4 ″ binding yarn 5 ″ binding yarn 11 ″ binding yarn 12 ″ binding yarn 13 ″ binding yarn 20 ″ binding yarn 21 ″ binding yarn 22 ″ binding yarn 23 ″ binding yarn 24 ″ binding yarn

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D21F 1/10 F term (4L055)

Claims (8)

(57) [Claims] 1. A paper-making-side fabric woven into a plain weave by a paper-making-side warp and a paper-making-side weft, and weft wear in which the running-side warp and the running-side weft form a running-side long crimp. From the running surface side woven fabric woven in a mold, and the binding weft thread that connects the paper manufacturing side fabric and the running surface side fabric by crossing the upper side of the paper making side warp and the lower side of the running side warp. In a two-layer papermaking fabric for papermaking, each binding weft yarn crosses over one papermaking surface side warp to form a papermaking surface side binding portion at intervals of three papermaking surface side warps. A binding weft yarn that binds a papermaking surface side fabric and a running surface side fabric by forming a running surface side binding part by intersecting under the running surface side warp between each of the surface side binding parts, The binding weft yarns are arranged adjacent to each other at a ratio of one to all the papermaking surface side wefts, and all the papermaking surface side binding portions and the papermaking surface side Two-layer fabric for paper making which is formed adjacent to the warp direction and yarns knuckle at a ratio of 1: 1. 2. A papermaking surface side weft knuckle is a knuckle in which a papermaking surface side weft crosses over one papermaking surface side warp and weaves warps into a tissue, and is formed every other papermaking surface side warp. The two-layer fabric for papermaking according to claim 1, 3. A two-layer papermaking fabric for papermaking according to claim 1, wherein the binding weft is arranged adjacent to both sides of the papermaking side weft. 4. A two-layer papermaking fabric for papermaking according to any one of claims 1 to 3, wherein the papermaking side warp and the running side warp are the same in number, and the papermaking side weft and the running side weft are the same in number. . 5. The running surface side fabric forms a long crimp of running surface side wefts for three running surface side warps on the running surface side 3 /
The two-layer woven fabric for papermaking according to any one of claims 1 to 4, which has a 1-twill weave structure. 6. The running surface side fabric forms a long crimp of the running surface side weft for the seven running surface side warps on the running surface side.
The two-layer fabric for papermaking according to any one of claims 1 to 4, which has one design. 7. An intersection where the running surface side weft intersects above the running surface side warp and a running surface side binding part where the binding weft intersects below the running surface side warp in the warp direction. The two-layer papermaking fabric for papermaking according to any one of claims 1 to 6, which is arranged not adjacent to each other. 8. The two-layer fabric for papermaking according to any one of claims 1 to 7, wherein the binding weft yarn is a polyamide monofilament.