JP2001248086A - Two-layer woven fabric for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a two-layer woven fabric for papermaking improved in rigidity, especially that in the oblique direction. SOLUTION: This two-layer woven fabric for papermaking is characterized in that (B) the woven fabric on the running surface side is made by using >=7 shafts, one warp yarn on the running surface side passes under one weft yarn on the running surface side, then passes over one or two weft yarns on the papermaking surface side, subsequently passes under one weft yarn on the running surface side and then passes over >=4 weft yarns on the running surface side, two formed parts where the one weft yarn passes under the one weft yarn on the running surface are arranged so as to be adjacent to parts where the one weft yarn on the running surface side passes under the one weft yarn on the running surface side adjacent on the respective different sides and the weft yarn on the running surface side forms long crimps of >=5 warp yarns on the running surface side on the running surface side in (A) the two-layer woven fabric comprising a woven fabric on the papermaking surface side composed of the warp yarns on the papermaking surface side and the weft yarns on the papermaking surface side, a woven fabric on the running surface side composed of the warp yarns on the running surface side and the weft yarns on the running surface side and connecting yarns arranged among the weft yarns on the papermaking surface side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a papermaking fabric,
In particular, it relates to papermaking fabrics, especially papermaking fabrics for paperboard.

[0002]

2. Description of the Related Art A papermaking method is a well-known technique. First, a papermaking raw material containing pulp fibers and the like is formed endlessly from a head box, and is suspended between rolls of a papermaking machine. Supplied to The side to which the raw material of the papermaking fabric is supplied is the papermaking surface, and the opposite side is the running surface. The supplied raw material moves as the papermaking fabric travels, and during the movement, moisture is removed by a dehydration device such as a suction box or a foil installed on the traveling surface side of the fabric to form wet paper. That is, the papermaking fabric functions as a filter and separates pulp fibers and water. The wet paper web formed in the papermaking zone is then transferred to a press zone and a dryer zone. In the press zone, the wet paper web is transported by a papermaking felt, and is squeezed together with the papermaking felt by a nip pressure between press rolls to further remove water. In the dryer zone, the wet paper web is transported by a papermaking canvas and dried to produce paper.

[0003] Papermaking fabrics are woven on a loom using warps and wefts such as synthetic resin monofilaments. To form an endless shape, it is formed endlessly by a known weaving seam, pin seam, or the like, or is formed endlessly at the stage of weaving by a bag weaving loom. In the case of bag weaving, the relationship between the warp and the weft is reversed between on the loom and during use. In this specification, a warp is a yarn extending in a machine direction of a papermaking machine, that is, a traveling direction of a woven fabric, and a weft is a yarn extending in a cross direction of a papermaking machine, that is, a width direction of a woven fabric. . There is a greater demand for papermaking fabrics, especially papermaking fabrics. Improvement of surface smoothness, prevention of paper wire mark generation, improvement of papermaking yield, good drainage, abrasion resistance, rigidity, dimensional stability, running stability, etc. Various proposals have hitherto been made for these requests. In order to improve the abrasion resistance, measures have been taken to change the fabric structure to a weft-wear type structure or to change the material of the yarn. Generally, from the viewpoint of improving the abrasion resistance of the woven fabric in use and maintaining the posture stability, it is preferable that the weft of the woven fabric be given a wear resistance effect. Naturally, when the warp is worn, the tensile strength is reduced, the dimensions of the woven fabric are increased, and when the warp is further worn and cut, the woven fabric itself is cut and the service life is exhausted.

Attempts have also been made to use polyamide monofilaments having excellent abrasion resistance for the weft, but this attempt does not improve the structure of the woven fabric itself, but simply utilizes the properties of the material used. Only
The epoch-making effect was not obtained, and the fabric using the half-side polyamide monofilament had a drawback that posture stability was poor. Attempts have been made to use a thick yarn for the weft on the running surface.However, there is a drawback in that the balance between the warp and the weft is lost, the crimping property is deteriorated, and wire marks are generated. Was. In order to prevent the generation of wire marks on paper, it is conceivable to increase the number density of warps and wefts to improve the supportability of the fibers, but for that purpose, it is necessary to reduce the diameters of the warp and the weft. However, in a well-known warp single weft double woven fabric generally used at present, when the wire diameter is reduced, abrasion resistance, rigidity, and posture stability are reduced. As described above, in the papermaking fabric, if the wire diameter is increased in order to improve the wear resistance and rigidity, the surface property is impaired, and a wire mark is generated on the paper, and conversely, the wire diameter is increased in order to improve the surface property. When the number of pieces is reduced and the number density is increased, the abrasion resistance and the rigidity are reduced.

[0005] In order to solve the above-mentioned problems, an attempt has been made with a woven fabric in which the papermaking surface side and the running surface side are formed using different warps and wefts, respectively, and the woven fabrics of both layers are integrated by binding yarns. Has also been made. That is, a dense papermaking surface is formed by using a warp and a weft having a small wire diameter on the papermaking side fabric, and a running having high wear resistance is performed by using a warp and a weft having a large wire diameter on the running surface side fabric. It forms a surface. In order to improve the rigidity, measures have been taken by laminating a plurality of yarns in the width direction and the length direction.
Many papermaking fabrics having a warp single weft triple structure stacked in layers have been put to practical use. However, regarding rigidity in the diagonal direction,
At present, only proposals have been made to the extent that the number of weaving warps and wefts is increased to improve them. Naturally, if the rigidity in the diagonal direction is inferior, the fabric is likely to deform,
A phenomenon called a bend in which a rhombus deforms or a weft deforms in an arc shape occurs. In addition, there has been a problem that the width is reduced and running performance is deteriorated. In particular, in the case of paperboard making, since the basis weight is large and the raw material at the time of papermaking is heavy, rigidity is particularly required. When a woven fabric having low rigidity is used, problems such as formation collapse and increase in load have occurred. In addition, the raw materials used in the production of paperboard are high in temperature, and the rigidity is reduced due to heat during use, so that a woven fabric having higher rigidity is required.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a warp for the papermaking side and a running side for the running side.
An object of the present invention is to provide a papermaking woven fabric which is constituted by using weft yarns and has improved rigidity, particularly, rigidity in an oblique direction, in a woven fabric in which both woven fabrics are united by a binding yarn.

[0007]

SUMMARY OF THE INVENTION The present invention relates to: (1) (A) a running paper comprising a papermaking surface side fabric comprising a papermaking surface side warp and a papermaking surface side weft, and a running surface side warp comprising a running surface side warp; In a two-layer papermaking woven fabric comprising a surface side fabric and a binding yarn arranged between the papermaking surface side wefts, (B) the running surface side fabric has seven or more shafts and the running surface side warp has one running surface side. After passing under the weft, pass over one or two papermaking side wefts, then one running surface side weft, pass under, and then pass over four or more running surface side wefts. And said 2
The part passing under one running surface side weft formed in one place is arranged so as to be adjacent to the part passing under one running surface side weft of running surface side warps adjacent to different sides, respectively. 2. A papermaking machine according to claim 2, wherein the running surface side weft forms five or more long crimps on the running surface side.
Layer fabric. 2. A portion passing under one running surface side weft formed at two places is adjacent to a portion passing under one running surface side weft of running surface side warps adjacent to different sides, respectively. 2. The two-layer papermaking woven fabric according to claim 1, wherein the warp yarns are arranged obliquely between the portions passing under the one running surface side weft formed at two places. About.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The running surface side fabric of the papermaking fabric of the present invention has 7 shafts or more, and the running surface side warp passes under one running surface side weft and then becomes one or two. A structure that passes under the traveling surface side weft, then passes under one traveling surface side weft, and then passes above four or more traveling surface side wefts, and is formed at the two locations. The portion passing under one running surface side weft is arranged so as to be adjacent to the portion passing under one running surface side weft of running surface side warps adjacent to different sides, respectively. The running surface side weft forms a long crimp of 5 or more running surface side warps on the running surface side. With this configuration, the running surface side warp alternately approaches or contacts the warp on both sides and becomes lateral, and is formed and arranged in an oblique direction. Thus, the rigidity in the oblique direction becomes very large. When a portion passing under one running surface side weft is arranged so as to be adjacent to a portion passing under one running surface side weft of an adjacent running surface side warp, two yarns are disposed at that portion. Because the continuous running surface side warp is woven from the upper side by the running surface side weft,
A force acts to bring the running surface side warps closer together,
This is the configuration described above. In addition, the running surface side weft is strongly woven from the running surface side by the two running surface side warps adjacent to each other, and a long crimp is formed on the running surface side, so that the wear resistance is improved, and the rigidity in the width direction is improved. growing. In addition,
The running surface side fabric needs to be 7 shafts or more. In the present invention, since the running surface side weft is strongly woven by two adjacent running surface side warps, the crimp that can be formed on the running surface is shorter than three warps and less than 5 shafts, and sharply protrudes toward the running surface side at 5 shafts or less. Only crimps can be formed, and the wear resistance cannot be satisfied at all. Further, although it is possible to form a long crimp to a certain extent with the six shafts, the oblique writing becomes tight on the tissue, which adversely affects other performances. The density of the number of yarns with respect to the papermaking surface side fabric is not particularly limited, and the running surface side warp or the running surface side weft may have a density of 1/2 or 2/3 of the papermaking surface side. However, the density of the running surface side weft is most preferably the same because the density is related to wear resistance. If the amount is too small, the wear resistance is reduced.

Next, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a design diagram showing a complete structure of an example of the present invention. The complete structure is the smallest repeating unit of the fabric structure, and the complete structure is connected vertically and horizontally to form the structure of the entire fabric. FIG. 2 is a partial plan view on the traveling surface side in FIG. In the design drawing, the warp is indicated by Arabic numerals, for example, 1, 2, and 3, and the weft is indicated by Arabic numerals with dashes, for example, 1 ', 4', 7 '. Further, the mark x indicates that the papermaking surface side warp is located above the papermaking surface side weft, the mark ○ indicates that the running surface side warp is located below the running surface side weft, The mark indicates that the binding yarn is located above the papermaking surface side warp, and the symbol □ indicates that the binding yarn is located below the running surface side warp. The warp yarns and the weft yarns on the papermaking surface side and the running surface side are arranged to overlap vertically. In FIGS. 1 to 4, since the number density is the same, the warp and the weft on the running surface side are arranged immediately below the warp and the weft on the papermaking side. In the design diagram, the yarns are accurately overlapped up and down so that the warp on the papermaking side, the warp on the running surface immediately below the weft, and the weft are arranged, but this is for the convenience of the drawing. In actual fabrics, they may be offset.

[0010] The yarn used in the present invention can be freely selected depending on the characteristics desired for the papermaking fabric, and is not particularly limited. For example, in addition to monofilaments, multifilaments, spun yarns, textured yarns that have been subjected to crimping or sublimation processing, textured yarns, bulky yarns, processed yarns generally referred to as stretch yarns, molding yarns, or a combination of these Can be used. The cross-sectional shape of the yarn may be not only a circle but also a square or star-shaped yarn, an elliptical yarn, or a hollow yarn. Also,
The material of the yarn can be freely selected, and polyester, nylon, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyether ether ketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metal and the like can be used. Needless to say, yarns in which various substances are blended or contained in the copolymer or these materials depending on the purpose may be used. Generally, it is preferable to use a polyester monofilament having rigidity and excellent dimensional stability for the papermaking side warp, the running side warp, and the papermaking side weft. Further, since the binding yarn is required to have abrasion resistance against the internal abrasion described above, it is preferable to use a nylon monofilament. In addition, it is preferable to interweave, for example, by alternately arranging polyester monofilaments and nylon monofilaments on the running surface side weft requiring abrasion resistance, since the abrasion resistance can be improved while securing rigidity.

[0011]

Next, the present invention will be described in detail with reference to examples. Example 1 FIG. 1 is a design diagram showing a complete structure of Example 1 of the present invention. In the design drawing of FIG. 1, 1, 2, 3, 4, 5, 6,
7, 8, 9, and 10 are warps, and the papermaking surface side warp and the traveling surface side warp are arranged vertically. 1 ', 4', 7 ', 1
0 ', 13', 16 ', 19', 22 ', 25', 2
Reference numeral 8 'denotes a weft, and the papermaking surface side weft and the traveling surface side weft are arranged vertically. 2 ', 3', 5 ', 6', 8 ',
9 ', 11', 12 ', 14', 15 ', 17', 1
8 ', 20', 21 ', 23', 24 ', 26', 2
7 ', 29', 30 'are binding yarns. First, when looking at the running surface side fabric, the running surface side warp 1 is a running surface side weft 1 '.
Pass above, and then pass below the running surface side weft 4 ',
Next, it passes above the running surface side wefts 7 ', 10', then under the running surface side weft 13 ', and then under the running surface side wefts 16', 19 ', 22', 25 ', 28'. Pass through. Then, on the design, the running surface side warp 1 is shifted upward by three running surface side wefts to sequentially run the running surface side warps 2, 3,.
4 to form a complete tissue. By the way, looking at the running surface side warp 3, the running surface side weft 1 '
In the portion passing through the upper side of the running surface side weft 1 'and the portion passing in the upper side of the running surface side weft 1', the portion in which the running surface side warp 4 passes in the upper side of the running surface side weft 1 'is arranged adjacently. In the portion passing above the running surface side weft 22 ', the portion where the running surface side warp 2 passes above the running surface side weft 22' is arranged adjacently. Therefore, a portion passing above one running surface side weft formed at two places of the running surface side warp is a portion passing above one running surface side weft of running surface side warps adjacent to different sides, respectively. It can be seen that they are arranged adjacent to each other. With this arrangement, the running surface side warp 3 'is formed at the running surface side weft 1'.
And 4 are arranged close to or in contact with each other, and in the portion of the running surface side weft 22 ', the running surface side warps 3 and 2 are arranged close to or in contact with each other, and the running surface side warp alternately approaches or contacts the both running surface side warps. And are arranged diagonally. The running surface side weft 1 'passes over the running surface side warps 3 and 4, and runs on the running surface side warps 5, 6, 7, 8, 9, 10,.
A long crimp for eight running surface side warps is formed on the running surface side, passing under the first and second sides. Therefore, the wear resistance is improved. Looking at the papermaking side fabric, the papermaking side weft 1 ′ passes under the papermaking side warps 1 and 2, then passes over the papermaking side warps 3, 4 and 5, and further passes through the papermaking side. It passes under the side warps 6, 7 and then the paper surface side warp 8,
Passing above 9 and 10. Therefore, it can be seen that the design of the papermaking surface side weft 1 'is a repetition of the structure passing below the two continuous papermaking surface side warps and then passing over the three consecutive papermaking surface side warps. The papermaking side weft 1 'is shifted to the right by two papermaking side warps, and the papermaking side wefts 4', 7 ', 10',...
... 28 'to form a complete tissue. The papermaking surface side warp 1 passes above the papermaking surface side weft 1 ', then passes below the papermaking surface side weft 4', then passes above the papermaking surface side weft 7 ', and then passes through the papermaking surface side weft 10'. , 13 ', above the papermaking side weft 16', then under the papermaking side weft 19 ', and then the papermaking side weft 2.
2 ', and then the papermaking side wefts 25', 28 '
Pass under the. Therefore, the structure of the papermaking surface side warp 1 is as follows.
Passes above one papermaking side weft, then passes below one papermaking side weft, then passes above one papermaking side weft, then under two papermaking side wefts. Is the repetition of the tissue passing through. And, in terms of structure, this papermaking surface side warp 1
Are shifted upward by three wefts on the papermaking side and are sequentially arranged on the papermaking side warps 2, 3, 4,..., 10 to form a complete design. By the way, when looking at the papermaking surface side warp 3, the papermaking surface side warp 4 passes over the papermaking surface side wefts 4 'and 10', and passes over the papermaking surface side weft 4 '. The portion passing above the surface side weft 4 'is arranged adjacently, and in the portion passing above the papermaking side weft 10', the papermaking side warp 2 passes above the papermaking side weft 10 '. Are located adjacent to each other. Therefore, a portion passing above one papermaking side weft formed at two places of the papermaking side warp is a portion passing above one papermaking side weft of papermaking side warps adjacent to different sides, respectively. It can be seen that they are arranged adjacent to each other. With this arrangement, the papermaking side warps 3 and 4 are brought into contact with the papermaking side weft 4 ', and the papermaking side warps 3 and 2 are brought into contact with the papermaking side weft 10'. The warp yarns on the papermaking side alternately contact the warp yarns on both sides to become lateral and are arranged obliquely. Papermaking side weft 1
The same applies to the portions 9 'and 25'. As described above, in the present embodiment, the warp yarn also has a structure in which the warp yarns alternately come into contact with the warp yarns on both sides to become lateral, similarly to the running surface side fabric. With such a configuration, the rigidity becomes very good due to the synergistic effect of the running surface side fabric and the paper making surface side fabric. Of course, the structure of the woven fabric on the papermaking side is not limited to this embodiment, but may be a normal plain weave structure, 2/2, 1/2, 1
Various twill weave structures and satin weave fabrics of ３ and ４ structures can be adopted. When the binding yarn is examined next, for example, the binding yarn 2 'is a papermaking surface side warp 1 in which the papermaking surface side weft 1' is continuous.
2 and the papermaking side weft 4 '
Next to the portion disposed below the papermaking surface side warps 8 and 9 that are continuous with each other, pass over the papermaking surface side warps 1, 2 and 8 and 9, and crimp the two papermaking surface side warps. It is formed and woven with the running surface side fabric through the lower side of the running surface side warp 5. Further, the binding yarn 3 'is a paper-making side warp in which the paper-making side weft 4' is continuous with the side of the portion below the paper-making side warps 6, 7 where the paper making side weft 1 'is continuous. 3,
4, a crimp equivalent to two papermaking side warps is formed passing above the papermaking side warps 6, 7 and 3, 4 and crimping the running surface side warp 9. And is woven with the running surface side fabric through the lower side. From this,
The binding yarn has both the original function of the binding yarn and the function of the fiber support yarn, and furthermore, the two yarns are provided on both sides of a portion where the papermaking surface side weft passes below two continuous papermaking surface warps. It can be seen that a weft crimp is formed above the papermaking surface side warp and is substantially continuous with the papermaking surface side, and the fiber support becomes very good. 2, 3 and 4 are design diagrams of a running surface side fabric according to another embodiment. FIG. 2 shows a fabric with 9 shafts, FIG. 3 shows a fabric with 8 shafts, and FIG. 4 shows a fabric with 7 shafts. From the design drawings, it is understood that the running surface side warps of any of the fabrics alternately approach or contact the running surface side warps on both sides, become lateral, and are arranged obliquely.

Conventional Example The running surface side fabric is a usual two-layer fabric for papermaking in which the upper fabric is formed of a plain weave and the usual weft-wearing fabric of a 4/1 satin fabric.

Comparative Test A comparative test was conducted using Example 1 as a representative example of the present invention.
A papermaking woven fabric woven by a conventional method is cut into 100 mm squares, a load of 500 g is applied in a diagonal direction, and the elongation is measured.
The rigidity in the oblique direction was compared. The example was 0.3%, while the comparative example was 2.4%.

[0014]

As described above, the two-layer woven fabric for papermaking of the present invention comprises the papermaking side and the running side using separate warps and wefts, respectively, and the woven fabrics of both layers are joined by binding yarns. The integrated fabric has very high rigidity, especially rigidity in the diagonal direction, and the width of the fabric shrinks without causing the phenomenon that the fabric is deformed into a rhombus or the weft is bent in a bow shape. There is no problem of poor running performance. In addition, even when a paperboard having a large basis weight and a high raw material temperature is produced, there is an excellent effect that problems such as formation collapse and increase in load do not occur.

[Brief description of the drawings]

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

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

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

FIG. 4 is a design diagram showing a complete structure of another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 warp 2 warp 3 warp 4 warp 5 warp 6 warp 7 warp 8 warp 9 warp 10 warp 1 'weft 4' weft 7 'weft 10' weft 13 'weft 16' weft 19 'weft 22' weft 22 'weft 2 'binding thread 3' binding thread 5 'binding thread 6' binding thread 8 'binding thread 9' binding thread 11 'binding thread 12' binding thread 14 'binding thread 15' binding thread 17 'binding thread 18' binding thread 20 'binding thread 21' binding thread 24 'binding thread 26' binding thread 27 'binding thread 29' binding thread 30 'binding thread

Claims (2)

[Claims] (A) between a papermaking surface side fabric comprising a papermaking surface side warp and a papermaking surface side weft, a traveling surface side fabric comprising a traveling surface side warp and a traveling surface side weft, and a papermaking surface side weft. In the two-layer woven fabric for papermaking comprising the arranged binding yarns, (B) the running surface side woven fabric has seven or more shafts, and the running surface side warp passes under one running surface side weft, or one or more. One of the two papermaking surface side wefts, then under one running surface side weft, then over four or more running surface side wefts, and one of the two formed The running surface side weft is arranged so that a portion passing under the running surface side weft is adjacent to a portion passing under one running surface side weft of running surface side warps adjacent to different sides. Is characterized in that a running surface side warp forms a long crimp of 5 or more on the running surface side. 2. A portion passing under one running surface side weft formed at two places, and a portion passing under one running surface side weft of running surface side warps adjacent to different sides, respectively. 2. The two layers for papermaking according to claim 1, wherein the warp yarns are arranged obliquely between portions passing under the one running surface side weft formed at two places, and being arranged adjacent to the paper. fabric.