JPH0987991A - Woven fabric for papermaking of single warp yarn and triple weft yarn structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a woven fabric for papermaking improved in strength in weaving joining parts by weaving a weft yarn arranged in each of the top, middle and bottom layers from a warp yarn in a single layer and forming a design on the papermaking surface and a design on the running surface. SOLUTION: A warp yarn comprising a polyester monofilament having a high rigidity and a low elongation and a weft yarn, comprising a nylon or the polyester monofilament and arranged in three layers of the top, middle and bottom weft yarns are used to form one design on the running surface of long crimps in which each warp yarn is passed under one bottom weft yarn and woven thereinto by a complete weave. Two designs on the papermaking surface in which each warp yarn is passed through a space between the top weft yarns and the middle weft yarns or between the middle weft yarns and the bottom weft yarns and further passed over the two mutually adjacent top weft yarns and woven thereinto are then formed to thereby weave a woven fabric for papermaking having a single warp yarn and triple weft yarn structure. Furthermore, auxiliary top weft yarns may be arranged between the top weft yarns in order to further smooth the papermaking surface and auxiliary middle weft yarns may be arranged under the auxiliary top weft yarns and between the middle weft yarns in order to increase the rigidity in the weft direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking fabric, and more particularly to a multi-layered papermaking fabric having triple weft yarns and single warp yarns.

[0002]

2. Description of the Related Art Woven fabrics having another layer structure of wefts include warp single weft double woven fabrics, warp double weft double woven fabrics in which two upper and lower wefts are joined by binding yarns, and the like. Are known. With increasing papermaking speed, triple woven fabrics have come to be used. When the papermaking speed was increased, wavy wrinkles were found in the papermaking fabric, and it was difficult to completely prevent wrinkles from occurring without making the papermaking fabric triple. The occurrence of wrinkles causes a serious problem that the paper becomes thin and thin. A triple woven fabric is, for example, Japanese Patent Publication 6-495.
No. 3 discloses a single weft consisting of three layers of upper weft, middle weft, and lower weft having a large diameter and a high density.
Cross pitch p ₁ with lower weft and cross pitch p ₂ with upper weft
Is set to p ₁ = 2p _{2 to} 4p ₂ , and a papermaking fabric in which a long crimp is formed on the running surface is shown. This woven fabric has excellent abrasion resistance. However, the triple woven fabric having improved abrasion resistance has a problem that the warp pull-out strength is lowered and the woven joint strength is weakened because the warp is less bent.

[0003]

Even when used under severe conditions in a high-speed machine, no wavy wrinkles are generated, no bad BD profile is produced, paper thickness is not generated, and the lower weft thread is loose. Provide a papermaking fabric that does not.

[0004]

Means for Solving the Problems The present invention provides "1. Upper and middle lower wefts, middle wefts, lower wefts and warps woven with these wefts arranged in three layers, each warp being a complete design Weaving once under the weft, and each lower weft is woven once with a complete design to form a long crimp,
Then, after each warp passes between the upper weft and the middle weft, or between the middle weft and the lower weft, weaves over the upper weft to form a papermaking surface structure arranged at equal intervals, and this weaving is performed. A papermaking woven fabric having a repetitively formed warp single weft triple structure, wherein at least two papermaking surface textures are arranged on the papermaking surface side between the running surface textures of the warp and A papermaking woven fabric having a triple warp single weft structure, characterized in that the warp yarns are woven at least four times between the intermediate weft yarns that are adjacent to each other in the papermaking face fabric structure that does not include the running surface texture within the interval. 2. The papermaking surface structure is a structure in which the warp yarns are woven and woven on two adjacent upper weft yarns, and the papermaking fabric having the triple structure of the warp single weft yarns described in item 1. 3. In the complete design, a warp passes under one lower weft to form one running surface design, and two adjacent upper wefts are woven and woven to form two paper making design. A papermaking fabric having a warp single weft triple structure as described in item 1 or 2. 4. An auxiliary upper weft is arranged between upper wefts, and a papermaking fabric having a triple warp single weft structure described in any one of 1 to 3. 5. A papermaking fabric having a triple warp single weft structure described in item 4, wherein the auxiliary middle wefts are arranged below the auxiliary upper wefts and between the intermediate wefts. About.

The wefts are arranged in three layers of upper, middle and lower, and the rigidity in the weft direction is increased, and the warp is made into a single layer so that the wefts are woven with the wefts of all the layers to improve the integration of the woven fabric. Since each lower weft has a complete design and is woven once with a complete design by the warp, a long crimp of the lower weft is formed on the running surface, and wear resistance becomes great.

In addition, each warp has a complete design, the lower weft is woven once, and the upper weft is woven twice between the successive continuous lower design weaving positions to form a paper-making surface. The intervals of the weft positions of the upper wefts arranged on the papermaking surface are equal. Since the upper and lower wefts are woven in this way, the knuckle on the running surface and the knuckle on the papermaking surface do not overlap. That is, in the case of warp yarn, two knuckles on the paper-making surface are arranged at equal intervals between the knuckles on the running surface.

In the complete design, the warp is woven at least four times between the papermaking surface design and the adjoining intermediate weft between the running surface designs. By thus weaving the middle weft yarns into the design, the pull-out strength of the warp yarns is increased.

In the present invention, the warp has a complete design and the lower weft is woven once. However, when the warp is woven from the lower side of the lower weft in such a manner, the warp is less bent and the portion near the straight line is increased. Therefore, conventionally, there has been a problem that the pull-out strength, which is the strength when the warp is pulled out of the design, is lowered, and the strength of the woven joint is weakened when the woven fabric is formed into an endless shape. If the strength of the woven joint is weak, the warp of the woven joint will come off during use and will be cut. Not only will this cut off the useful life of the machine, but also the risk of damaging the paper machine, which should never happen.

For this reason, conventionally, the width of the woven joint has been increased to cope with the problem. In order to increase the width of the woven joint, more wefts must be opened, but even a woven fabric with a triple weft structure has a large number of wefts due to its structure, and it is necessary to open many wefts. If it is necessary to open more weft yarns even if it takes time for the piecing work, it is not only time-consuming, but the existing anti-automatic weaving machine and fully automatic weaving machine lack the heddle. There was a problem that I could not respond. Therefore, it is desired to increase the strength of the woven joint without increasing the width of the woven joint. In the present invention, the width of the woven joint can be reduced.

In the present invention, an auxiliary weft may be arranged between the upper wefts in order to make the paper-making surface smooth. When the upper weft is woven with the warp, the yarn bends downward and a dent is formed between adjacent wefts, but when an auxiliary weft is placed here, the dent is compensated to smooth the papermaking surface and improve the smoothness of the paper. . Since the auxiliary weft has a smaller wire diameter than the weft, it does not substantially change the water quality or the fabric structure. It is also possible to arrange the auxiliary middle weft under the auxiliary upper weft, and if the rigidity in the weft direction is more important than the water resistance, increase the rigidity of the middle weft and use a structure that sacrifices the water resistance. Sometimes auxiliary middle wefts are very effective.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The woven fabric having the structure of the present invention can be woven by driving three kinds of wefts in a predetermined order while opening the warp according to the upper, middle and lower weft arrangements. As the yarn to be used, a lower weft and a yarn having a larger wire diameter than the middle weft can be used, and rigidity and abrasion resistance can be further increased. The warp yarn used in the present invention is preferably a polyester monofilament yarn because of its high rigidity and low elongation. As the weft, nylon monofilament or polyester monofilament is preferably used, but these monofilaments may be used in combination.
Nylon monofilament or polyester monofilament is used as the auxiliary weft. If heat resistance is required, polyphenylene sulfide monofilament is also suitable. Monofilaments are preferable because they have high rigidity.

The auxiliary wefts are arranged between the upper and middle wefts,
The upper auxiliary weft and the middle auxiliary weft are used as the auxiliary weft, and the upper auxiliary weft is formed by weaving the upper weft and the warp. The surface of the weft is smoothed by compensating for the recesses in the crossing portion that goes downward from the lower part of the weft and goes over the upper weft, and the middle auxiliary weft has the effect of improving the rigidity of the woven fabric without changing the basic design. This auxiliary weft is woven into the design, but has a different action from the original weft that forms the basic design of the woven fabric. Therefore, in the present invention, the weft and the auxiliary weft are clearly distinguished to describe the woven design. The woven fabric is cut into a predetermined size, and both ends are woven to form an endless shape.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1, FIG. 2, FIG. 3, and FIG. 4 are design diagrams showing the complete design of the present invention. FIG. 5 is a design diagram showing a complete design of a conventional example. In the design diagram, a cross indicates a portion where the warp threads intersect with each other on the upper side of the upper weft, and indicates a position where the upper weft is woven from the paper-making side. A circle mark indicates a portion where the warp crosses under the lower weft, and the position where the lower weft is woven from the running surface side. The unmarked portion indicates a portion where the warp is arranged between the upper weft and the middle weft or between the middle weft and the lower weft. How they are arranged will be specifically shown later by a cross-sectional view along the warp. The warp is a number without a dash, the weft is a number with a dash, the wefts arranged in the upper, middle, and lower layers are the same number, and the auxiliary weft is a number with a double dash.

The embodiment shown in FIG. 1 has 16 warps, upper and
Auxiliary weft 1 arranged between 16 middle and lower wefts and upper weft
A complete tissue is formed with 6 pieces. The warp yarn 1 passes under one lower weft yarn 1'and is woven from the running face side to form a running face side structure, and two adjacent upper weft yarns 7 ', 9'and upper weft yarns 23', 25 'are formed. The paper making surface side structure is formed by weaving from above the paper making surface side. The warp 1 is the lower weft 1 '.
Is woven from the running surface side to form a long crimp for 15 warps on the running surface side. It is understood that the warp 1 forms the running surface side design, then forms the paper manufacturing surface side design, and then forms the second paper manufacturing surface side design without forming the second running surface side design. To be done. Further, the intervals between the structures on the papermaking side are such that upper wefts 11 ', 13', 15 ', 17', 1
6'of 9 ', 21' and upper wefts 27 ', 29', 3
It is understood that 1'is equivalent to six upper weft yarns 1 ', 3', 5'of the complete design, which are equal to each other. In this embodiment, the auxiliary weft 8 ″ and the auxiliary weft 24 ″, which are arranged between two continuous upper wefts that are woven from the paper-making surface side of the paper-making-side structure, are simultaneously woven from the paper-making surface side. I'm out. The warps 2 to 16 are sequentially arranged by shifting the warp 1 by three wefts (six wefts including the auxiliary weft). In this design drawing, it is not possible to understand whether the warp is arranged between the upper weft and the middle weft or between the middle weft and the lower weft, except for the portion forming the papermaking side design and the running side design. A cross-sectional view along the warp will be shown and described.

FIG. 6 is a sectional view taken along the warp 1. After the warp 1 passes through the lower side of the lower weft 1'to form the running surface side structure, it passes between the middle weft 3'and the lower weft 3 ', between the upper weft 5'and the middle weft 5', and next to it. Matched upper wefts 7 ', 9',
And a papermaking surface side structure is formed by passing above the auxiliary wefts 8 ″ arranged between these upper wefts. When the papermaking surface side structure is formed, next, the upper weft 11 ′ and the middle weft 11 ′ are formed.
Between the middle weft 13 'and the lower weft 13', the upper weft 1
Between 5 ', 17' and intermediate wefts 15 ', 17', intermediate weft 1
9'and lower weft yarn 19 ', upper weft yarn 21' and middle weft yarn 21 '
Between the upper wefts 23 'and 2 which are next to each other.
5 ', and after forming a second papermaking side structure by passing above the auxiliary wefts 24 "arranged between these upper wefts, between the upper wefts 27' and the middle wefts 27 ', Weft 2
It passes between 9 ', 31' and lower wefts 29 ', 31'. Within the interval between the structures on the side of the papermaking surface that does not form the structure on the side of the running surface, that is, wefts 11'13 ', 15', 17 ', 1
In the portions 9'and 21 ', the warp yarns 1 and the intermediate weft yarns 11' and 1
3 ', 13' and 15 ', 17' and 19 ', 19' and 2
It can be well understood that the warp yarns pass through the space 1'and are woven four times between the adjacent intermediate weft yarns and thus the warp yarns are bent a lot. By passing between the adjacent intermediate wefts at least four times in this way, the bending of the warp yarns increases and the pull-out strength of the warp yarns is improved.

FIG. 2 is a design diagram showing the complete design of another embodiment. A complete design is formed by 14 warps, 14 upper / middle / lower wefts, and 14 auxiliary wefts. The warp yarn 1 passes under one lower weft yarn 1'and is woven from the running face side to form a running face side structure, and two adjacent upper weft yarns 7 ', 9'and upper weft yarns 21', 23 'are formed. The paper making surface side structure is formed by weaving from above the paper making surface side. Further, the warp 1 is obtained by weaving the lower weft 1'from the running surface side to form a long crimp for 13 warps on the running surface side. The warp 1 forms a running surface side structure, then forms a papermaking surface side structure, and then 2
It is understood that the second papermaking surface side structure is formed without forming the second running surface side structure. Further, the intervals between the structures on the papermaking surface side are such that upper wefts 11 ', 13', 15 ', 1
It is understood that the same is true for the five yarns 7'and 19 ', the five upper weft yarns 25' and 27 ', and the next five complete weft yarns 1', 3'and 5 '. In the present embodiment, the auxiliary weft 8 ″ and the auxiliary weft 22 ″, which are arranged between two continuous upper wefts that are woven from the paper making surface side of the paper making surface side structure, are simultaneously woven from the paper making surface side. I'm out. The warp yarns 2 to 14 are sequentially arranged by shifting the warp yarn 1 by three weft yarns (six wefts including an auxiliary weft yarn). In this design drawing, it is not possible to understand whether the warp is arranged between the upper weft and the middle weft or between the middle weft and the lower weft, except for the portion forming the papermaking side design and the running side design. A cross-sectional view along the warp will be shown and described.

FIG. 7 is a sectional view taken along the warp 1. After the warp 1 passes through the lower side of the lower weft 1'to form the running surface side structure, it passes between the middle weft 3'and the lower weft 3 ', between the upper weft 5'and the middle weft 5', and next to it. Matched upper wefts 7 ', 9',
And auxiliary wefts 8 ″ arranged between these upper wefts
To form a papermaking side tissue. When the papermaking side structure is formed, next, between the upper weft 11 'and the middle weft 11', between the middle weft 13 'and the lower weft 13', between the upper weft 15 'and the middle weft 15', and the middle weft 17 '. Between the lower weft 17 ',
The upper weft yarns 19 'and the intermediate weft yarns 19' are sequentially passed, and then the upper weft yarns 21 ', 23' and the auxiliary weft yarns 22 '' disposed between the upper weft yarns 21 ', 23' are adjacent to each other. After forming the structure on the paper-making side of the eye, it passes between the upper weft 25 'and the middle weft 25', and between the middle weft 27 'and the lower weft 27'. Within the space of the side tissues, that is, wefts 11 ', 13', 15 ', 17',
In the portion 19 ', the warp 1 is the intermediate wefts 11' and 13 ',
It often passes between 13 'and 15', 15 'and 17', 17 'and 19', and is often woven four times between the adjacent intermediate wefts, and the warp often bends a lot. Understandable. In this way, at least 4
By passing the warp twice, the bending of the warp increases and the pull-out strength of the warp improves.

FIG. 3 is a design diagram showing the complete design of another embodiment. Similar to the embodiment shown in FIG. 2, 14 warps, 14 upper / middle / lower wefts, and 14 auxiliary wefts form a complete design. The difference is the method of weaving the auxiliary wefts.
In the embodiment shown in, the auxiliary wefts, which are arranged between two continuous upper wefts woven from the paper-making surface side of the paper-making surface side, are simultaneously woven from the paper-making surface side. The auxiliary weft disposed between two continuous upper wefts woven from the side is not woven, but the warp is disposed on the lower side, and the auxiliary weft located on the opposite side of the auxiliary weft disposed between the upper weft and the upper weft. At the same time, it is incorporated. That is, as seen from the warp 1, the auxiliary weft 8 ″ disposed between the two upper wefts 7 ′ and 9 ′, which are continuous, forms the structure on the paper-making side, and the auxiliary weft 8 ″ is interwoven. Without the auxiliary weft 8 ″, the warp is arranged on the lower side, and the auxiliary weft 6 ″ and the auxiliary weft 10 ″ are located on the opposite side of the auxiliary weft 8 ″.
At the same time. This can be better understood from FIG. 8 which is a sectional view of the warp yarn 1.

FIG. 4 is a design diagram showing the complete design of another embodiment. This is an example in which auxiliary wefts are arranged between the middle wefts of the embodiment shown in FIG. Since the layout of the intermediate layer is not shown in the design drawing, the arrangement cannot be understood. Therefore, looking at FIG. 9, which is a cross-sectional view taken along the warp 1, there is a middle auxiliary weft between the middle wefts and under the upper auxiliary wefts. You can understand that they are arranged. This embodiment is effective for a paper machine or the like in which rigidity in the weft direction is more important than in water.

FIG. 5 is a design diagram showing the complete design of the conventional example. The running surface side design and the paper making surface side design are the same as those of the embodiment shown in FIG. 2, and the difference is the arrangement of the warp yarns within the intervals between the paper making surface side designs which do not form the running surface side design. The design view does not show the difference because the yarns of the intermediate layer are not shown, but looking at FIG. 10 which is a cross-sectional view taken along the warp yarns 1, it can be seen that the distance between the structures on the papermaking surface side that does not form the structure on the running surface side. Of which
That is, wefts 11 ', 13', 15 ', 17', 19 '
In the portion of, the warp 1 is the intermediate wefts 11 'and 13', 1
It can be well understood that they pass between 7'and 19 ', pass only twice between the adjacent intermediate wefts, and are arranged in a straight line with little warp bending. In this way, the warp is bent less and is arranged in a straight line, so that the pull-out strength of the warp is small.

COMPARATIVE TEST The results of a comparative test conducted by using the embodiment shown in FIG. 1 as a representative example of the present invention and the conventional example shown in FIG. 5 as a comparative example are shown in Table 1.
Shown in The composition of the fabric is also shown in Table 1. The comparative test was performed with pull-out strength. The device used for the test is the device shown in FIG. d is a pair of chucks. One chuck holds one end of a woven fabric having a length of about 100 mm and a width of 30 mm, and the weft yarn is sequentially removed from the tip of the other end to leave only the warp yarn. When the length of the warp is about 50 mm, one warp is left and the other warp is cut and removed.
The end of the 0 mm warp is held by another chuck, and the warp is cut in the tissue at 30 mm c from the end of the fabric. In this way, the warp b woven into the structure by 30 mm is formed. The strength with which the warp b was pulled out from the woven fabric a was determined by a tensile tester. It is not possible to say unequivocally as to what level of strength is safe because the warp threads of the woven joint do not come off during use because it depends on the mesh of the warp threads and the width of the woven joint, but from experience It is known that there must be a strength of at least 0.65 Kg.

[0022]

[Table 1]

[0023]

EFFECTS OF THE INVENTION When a long crimp is formed on the running surface, the lower weft is less woven and the pull-out strength of the warp is reduced, but the present invention arranges the weft in three layers of upper, middle and lower to woven the warp as a single layer, At least 4 between adjacent middle weft threads
By passing through and weaving the middle weft yarns, the warp yarns are bent to increase the pull-out strength, thereby significantly increasing the strength of the woven joint.

[Brief description of drawings]

FIG. 1 is a design diagram showing a complete design of a papermaking fabric of the present invention.

FIG. 2 is a design diagram showing the complete design of the papermaking fabric of the present invention.

FIG. 3 is a design diagram showing the complete design of the papermaking fabric of the present invention.

FIG. 4 is a design diagram showing the complete design of the papermaking fabric of the present invention.

FIG. 5 is a design diagram showing a complete design of a conventional papermaking fabric.

6 is a sectional view taken along the warp 1 of FIG.

7 is a sectional view taken along the warp 1 of FIG.

8 is a sectional view taken along the warp 1 of FIG.

FIG. 9 is a sectional view taken along the warp 1 of FIG.

FIG. 10 is a sectional view taken along the warp 1 of FIG.

FIG. 11 is an explanatory diagram showing a pull-out strength test.

[Explanation of symbols]

 1 Warp 2 Warp 3 Warp 4 Warp 5 Warp 6 Warp 7 Warp 8 Warp 9 Warp 10 Warp 11 Warp 12 Warp 13 Warp 14 Warp 15 Warp 16 Warp 1 ′ Upper / Medium / Lower Weft 3 ′ Upper / Middle 5 ′ Upper / Lower Upper / middle / lower weft 7 ′ Upper / middle / lower weft 9 ′ Upper / middle / lower weft 11 ′ Upper / middle / lower weft 13 ′ Upper / middle / lower weft 15 ′ Upper / middle / lower weft 17 ′ Upper / Middle / Lower Weft 19 'Upper / Medium / Lower Weft 21' Upper / Middle / Lower Weft 23 'Upper / Middle / Lower Weft 25' Upper / Middle / Lower Weft 27 'Upper / Middle / Lower Weft 29' Upper / Middle / Lower Lower weft 31 ′ Upper / Medium / lower weft 2 ″ Auxiliary weft 4 ″ Auxiliary weft 6 ″ Auxiliary weft 8 ″ Auxiliary weft 10 ″ Auxiliary weft 12 ″ Auxiliary weft 14 ″ Auxiliary weft 18 ″ Auxiliary weft 20 ″ Auxiliary weft 22 "Auxiliary weft 24" Auxiliary weft 26 "Auxiliary weft 28" Auxiliary weft Thread 30 ″ Auxiliary weft 32 ″ Auxiliary weft a Woven fabric b Warp c Notch d Chuck

Claims (5)

[Claims] 1. An upper weft, a middle weft, a lower weft and warps woven with the lower weft arranged in three layers of upper, middle and lower, and each warp is woven once under a lower weft in a complete design, and Each lower weft is woven once with a complete design to form a long crimp, and then each warp passes between the upper weft and the middle weft, or between the middle weft and the lower weft, and then on the upper weft. A papermaking woven fabric having a warp single-weft triple structure formed by repeating weaving and forming a papermaking surface structure arranged at equal intervals, wherein the papermaking between the running surface structure of the warp and the running surface structure At least two papermaking surface textures are arranged on the surface side, and in the space of the papermaking surface textures, the warp yarns do not woven at least four times between the intermediate weft yarns between the papermaking surface textures that do not include the running surface texture A woven fabric for papermaking having a warp single weft triple structure. 2. The papermaking fabric having a triple warp single weft structure according to claim 1, wherein the papermaking surface structure is a structure in which warp yarns are woven and woven on two adjacent upper weft yarns. 3. In a complete design, a warp passes under one lower weft to form one running surface design, and two adjacent upper wefts are woven and woven to form a paper design design. The warp single weft triple structure triple structure papermaking fabric according to claim 1 or 2, wherein two fabrics are formed. 4. A papermaking fabric having a triple warp single weft structure according to any one of claims 1 to 3, wherein an auxiliary upper weft is arranged between the upper wefts. 5. The papermaking fabric of claim 4, wherein the auxiliary middle wefts are arranged under the auxiliary upper wefts and between the intermediate wefts.