JP2004036053A - Double-layered woven fabric for industrial use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-layered woven fabric of a ground yarn bonding type for paper-making use, usable without generating a state in which a warp is absent on the upper layer face at the bonded part and free from the trouble of the local excessive dehydration. <P>SOLUTION: The double-layered woven fabric for industrial use is characterized in that the warp of the upper layer weaves a lower layer weft to be woven with a lower layer warp on a woven fabric texture toward the lower layer side at one or several parts of a complete texture between the parts to weave the upper layer weft with the upper layer warp from the upper layer side, and the lower layer warp passes between the upper layer and the lower layer without weaving the lower layer weft to be woven with the lower layer warp on the woven fabric texture at a part to weave the lower layer weft with the upper layer warp from the lower layer side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to woven fabric for papermaking, woven fabric for nonwoven fabric production, woven fabric used for dewatering or squeezing sludge, belts for building material production, industrial fabrics such as conveyor belts, especially papermaking fabrics, especially for tissue production The present invention relates to a papermaking fabric.
[0002]
[Prior art]
Conventionally used industrial fabrics include, for example, papermaking fabrics, papermaking fabrics such as canvases, nonwoven fabric manufacturing fabrics, fabrics used for dewatering and water removal of sludge, building material manufacturing belts, conveyor belts and the like. There are things. Since these industrial fabrics run while receiving tension in the warp direction during use, dimensional stability is required so that elongation and contraction in the width direction do not occur. In addition, posture stability is required so that meandering and wrinkling do not occur. In addition, since it is worn by contact with a driving roll or the like during traveling, wear resistance is also required. In addition, it is required that the surface be smooth in terms of placing and transporting or processing an object on the surface.
Such a problem is almost common in industrial textiles, but has not been solved yet. Among the industrial fabrics, the most severely required papermaking fabrics that require these performances, especially papermaking fabrics, are required to have the unique performances of papermaking described below in addition to the above-mentioned performances. The problems common to industrial fabrics and their solutions can be explained and understood, so that the present invention will be described below on behalf of papermaking fabrics.
The 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, is fed between rolls of a paper machine, and is supplied onto a running papermaking fabric. The side to which the raw material of the papermaking fabric is supplied is the upper surface, and the opposite side is the lower surface.
The supplied raw material moves as the papermaking fabric travels, and during the movement, moisture is removed by centrifugal force or a dehydration device such as a suction box or foil installed on the lower surface side of the fabric, forming wet paper. Is done. That is, the papermaking fabric functions as a filter and separates pulp fibers and water.
The wet paper 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 the papermaking felt and is squeezed together with the papermaking felt by the nip pressure between the 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.
The papermaking woven fabric is woven on a loom using warps and wefts such as synthetic resin monofilament. 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 fabric, and a weft is a yarn extending in a machine cross direction of a papermaking machine, that is, a width direction of a fabric.
[0003]
By the way, in order to effectively improve the supportability of the fiber and generate a good quality paper without generating a wire mark on the paper, the fiber is preferably supported by the weft from the relation of the orientation of the fiber and the like. This is very important. In particular, in a papermaking fabric for producing a tissue, since the tissue is very thin and the dewatering zone is short while the paper machine is operated at a high speed, fiber support and paper peeling properties are particularly required. Poor fiber support and paper peeling properties can lead to pinholes, causing not only apparent problems but also opacity and paper strength, as well as fiber carryback and splash. Operation is also a major problem.
Therefore, a single-layer woven fabric in which a weft forms a long crimp on the upper surface side has been used as a papermaking woven fabric for tissue production. This is because the tissue machine contains little filler and places more importance on fiber support and paper peeling rather than abrasion resistance. However, single-layer fabrics have become unable to cope with the increasing mechanical loads of increasingly faster paper machines. Although the single-layer woven fabric has advantages such as a thin net and good water drainage, disadvantages such as poor formation, running property, and poor retention due to insufficient rigidity due to the structure have become extremely large. It is.
In recent years, the use of multiple fabrics in tissue machines has been increasing, leading to moderate success. The structure of the multi-layer fabric is an upper and lower two-layer fabric structure in which the upper and lower fabrics are combined by using a weft double fabric and a binding yarn, and as a structure on the upper surface side, the weft forms a long crimp on the upper surface side. Structure. In addition, in the case of a two-layer fabric, the plain fabric of the ridge weave in which the lower surface side fabric has two warps aligned in parallel is mainly used for the purpose of reducing the net thickness in order to secure drainage and small water retention. It is used.
Recently, a two-layer woven fabric of a ground yarn binding type having no independent binding yarn, in which the upper and lower nets are joined by a part of the upper layer warp as disclosed in European Patent No. EP 0889160 A1, has been partially used. Used. Since this type of two-layer fabric does not have independent binding yarns, it was possible to increase the number of wefts without lowering drainage (air permeability). Therefore, it was expected that the fiber supportability could be improved, and the fiber was used, but there was a large problem due to the portion where the upper warp was bonded. Since the upper layer warp functions as a binding yarn, the warp does not exist on the upper layer side at the part that dives to the lower layer side, and excessive dehydration occurs locally at that part, causing fiber carryback, splash, etc. In addition, such a portion was formed as a horizontal mark, and when the portion was strong, it had an adverse effect on creping. This problem has not been solved yet.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and in a ground yarn binding type two-layer fabric having no independent binding yarn, a state in which no warp is present on the upper layer side at the binding portion does not occur, and A wire that has a structure that does not cause excessive dehydration, can increase the number of wefts without lowering drainage (air permeability), has good fiber supportability, and does not generate fiber carryback, splash, etc. Another object of the present invention is to provide a papermaking fabric having good markability.
[0005]
[Means for Solving the Problems]
The present invention
"1. In an industrial two-layer fabric consisting of an upper surface side fabric composed of an upper surface side warp and an upper surface side weft, and a lower surface side fabric composed of a lower surface side warp and a lower surface side weft, the upper surface side The lower surface side warp weaves on the fabric structure toward the lower surface side between the regions where one or more upper surface side warps weave the upper surface side weft from the upper surface side in the warp in the complete structure. An upper surface side warp in which a lower surface side weft to be woven from the lower surface side functions as a binding yarn, while the lower surface side warp is an upper surface side warp in which the lower surface side weft is woven from the lower surface side. An industrial two-layer fabric characterized in that a lower surface side warp is to be woven on the woven fabric structure, and passes between the upper surface side and the lower surface side without weaving the lower surface side weft.
2. The upper surface side fabric is a repetition of a structure in which the upper surface side warp passes under three upper surface side wefts continuous and then passes below one upper surface side warp. Is a repetition of a structure in which a long crimp is formed on the upper surface side through the upper side of three continuous upper surface side warps and then passes under one upper surface side warp, and the lower surface side fabric structure is 2. The industrial two-layer fabric according to claim 1, wherein the lower surface side warp has a plain weave structure of a ridge weave structure in which two warps are arranged in parallel in the same structure. "
About.
Hereinafter, the present invention will be described with reference to a papermaking fabric as described above.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is directed to a lower surface side woven fabric toward a lower surface side, in which a part or all of the upper surface side warp is a portion of the upper surface side warp in a warp direction where the upper surface side warp weaves the upper surface side weft from the upper surface side. On the texture, the lower surface side weft, which the lower surface side warp should originally weave, is woven from the lower surface side, while the lower surface side warp is such that the upper surface side warp faces the lower surface side with the lower surface side weft. In the portion woven from the lower surface side design, the lower surface side warp should originally be woven from the lower surface side, but the upper surface side warp is woven from the lower surface side toward the lower surface side. It is characterized in that it passes between the upper layer side and the lower layer side without weaving the layer side weft.
With the above configuration, the upper surface side warp functions as a binding yarn and dips into the lower surface side, that is, in the papermaking fabric disclosed in the conventional European Patent EP 0889160A1, the warp yarn is disposed on the upper surface side. The lower surface side warp passes between the upper surface side and the lower surface side through the portion where there was no presence, excessive dehydration locally, causing problems such as fiber carry back and splash, and the upper surface It was possible to compensate for the warp instead of the side warp, thereby solving the problem of excessive dehydration locally.
In addition, also on the lower surface side, since the lower surface side warp passes between the upper surface side and the lower surface side in order to supplement the upper surface, there is no problem because the upper surface side warp is lowered to the lower surface side and compensates. is there.
[0007]
Furthermore, since the position at which the upper surface side warp complements and weaves the weft is the lower surface side weft which the lower surface side warp should originally weave, the lower surface side design does not substantially collapse and the wire mark characteristics etc. Good. In addition, the present invention has a structure in which the binding is performed by a ground warp, so that the yarn functioning as a binding yarn is a ground yarn, and is a warp that is always in tension during use. Compared to the use of yarn, the binding force for bonding the upper fabric and the lower fabric is very strong, and the force that always adheres the upper fabric and the lower fabric works. The properties are good. Therefore, there are no problems such as the binding yarn being rubbed between the two fabrics to cause internal wear to weaken the binding force, a gap between the two fabrics, and separation.
[0008]
In addition, the upper fabric side textile structure and the lower fabric side textile structure are not particularly limited as long as the above structure can be formed, but the upper fabric side textile structure is changed to the three upper fabric sides where the upper surface side warp is continuous. After passing through the lower side of the weft, the repetition of the structure passing under one upper surface side warp causes the upper surface side weft to pass over the three successive upper surface side warps to the upper surface side. Assuming that the repetition of the structure passing under one upper surface side warp after the formation of the long crimp, a structure in which the weft appears more on the upper surface side which is the papermaking surface side, and the lower surface side woven fabric structure is If the layer side warp has a plain weave structure of a ridge weave structure in which two warps are arranged in parallel in the same structure, the state becomes the same as when a thin flat yarn is used for the warp, and the crimp length of the weft on the structure becomes shorter. Good fiber support and paper peeling properties due to a thin net thickness structure It is particularly suitable to papermaking fabrics for tissue manufacture thinness of AmiAtsu is particularly required.
[0009]
The density of the number of yarns with respect to the upper surface side fabric is not particularly limited, and the lower surface side weft can have the same density as that of the upper surface side, or a density such as や or ／.
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 monofilament, multifilament, spun yarn, crimped or bulky processed textured yarn, bulky yarn, processed yarn commonly called stretch yarn, mulled yarn, or twisting these together Can be used. The cross-sectional shape of the yarn may be not only a circular shape but also a rectangular shape such as a square shape or a star shape, an elliptical shape, or a hollow shape. In addition, the material of the yarn can be freely selected, and polyester, nylon, polyphenylene sulfide, polyfluorovinylidene, 4fluoroethylene, polypro, aramid, polyetheretherketone, polyethylenenaphthalate, cotton, wool, metal, etc. are used. it can. Needless to say, yarns in which various substances are blended or contained in the copolymer or these materials according to the purpose may be used.
Generally, it is preferable to use a polyester monofilament having rigidity and excellent dimensional stability for the upper surface side warp, the lower surface side warp, and the upper surface side warp. Further, the lower surface side weft requiring abrasion resistance can be improved in abrasion resistance while ensuring rigidity by interweaving, for example, by alternately arranging polyester monofilament and nylon monofilament.
Further, a plurality of yarns can be arranged with the same structure in a portion where one yarn is originally arranged on the structure. By arranging and arranging a plurality of yarns having a small wire diameter, it is possible to improve the surface property and reduce the thickness of the woven fabric.
[0010]
【Example】
Embodiments of the present invention will be 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. In the design drawing, the warp is indicated by Arabic numerals, for example, 1, 2, 3, and the weft is indicated by Arabic numerals with dashes, for example, 1 ', 2', 3 '.
In addition, the mark x indicates that the upper surface side warp is located above the upper surface side weft, and the mark ○ indicates that the lower surface side warp is located below the lower surface side weft, and ▲ The mark indicates the portion where the lower surface side warp is located above the upper surface side weft, that is, the binding portion where the lower surface side warp functions as a binding yarn, and the □ mark indicates that the upper surface side warp is the lower surface weft. It shows a portion located below the side weft, that is, a binding portion where the upper surface side warp functions as a binding yarn.
The warp yarns and the weft yarns on the upper surface side and the lower surface side are arranged vertically. Incidentally, in the design diagram, the yarns are precisely overlapped vertically, and the upper surface side warp, the lower surface side warp and the weft are arranged immediately below the weft, but this is for the convenience of the drawing. In actual woven fabrics, they may be shifted. In this embodiment, since the lower surface side fabric has two adjacent warps having the same ridge weave structure, two lower surface side warps are actually arranged adjacent to each other.
[0011]
Example 1 FIG. 1 is a design diagram showing a complete structure of Example 1 of the present invention.
In the design diagram of FIG. 1, 1,2,3,4,5,6,7,8 are the warps, and the upper surface side warp and the lower surface side warp are arranged vertically. 1 ', 2', 3 '... 16' are weft yarns, the upper surface side wefts are arranged on the upper side, and the lower surface side wefts are half-density and odd-numbered upper surface side wefts 1 ', 3', 5 ... Are arranged below.
First, looking at the upper surface side fabric, for example, the upper surface side weft 4 ′ passes above three upper surface side warps 1, 2, 3, and then passes below one upper surface side warp 4. Then, it passed above the three upper surface side warps 5, 6, 7, and then passed under one upper surface side warp 8, and passed above the three successive upper surface side warps. It can be seen that the structure passes below the upper one upper surface side warp.
On the other hand, the upper surface side warp 4 passes below the three upper surface side wefts 1 ', 2', 3 ', then passes above one upper surface side weft 4', and then 3 upper surface side wefts 4 '. After passing under the side wefts 5 ', 6', 7 ', and then over one upper surface side weft 8', and after passing under three consecutive lower surface side wefts, 1 It can be seen that the texture passes above the upper surface side weft of the book.
Since the upper surface side weft forms a long crimp for three upper surface side warps on the upper surface side, the fiber support of the weft becomes good. The upper surface side warp is shifted upward by one upper surface side weft, and is sequentially arranged, indicating that the upper surface side warp is a twill weave. In the present embodiment, the above-described structure is employed, but the present invention is not limited to this, and a satin weave structure may be used, and the crimp of the weft may be longer or shorter. Since the twill weave structure can increase the limit number of wefts to be driven than the satin weave structure, the number of wefts can be increased if there is no problem in ventilation.
[0012]
Next, when the lower surface side fabric is examined, it can be seen that the lower surface side warps 1 and 2, 3 and 4, 5, 6 and 7 and 8 have a plain weave structure of a ridge weave in which the same structure is arranged. The net thickness can be reduced, and it is particularly suitable as a papermaking fabric for tissue production. In an actual woven fabric, the lower surface side warps 1 and 2 are closely arranged below the upper surface side warps 1 and 2. The advantage of the ridge weave structure is that compared to the case of arranging one thick warp having a cross-sectional area of two, it is the same as the case of using a flat cross-section yarn, so the net thickness is thin. There is a point formed in the weft wear type.
[0013]
Next, the connection portion will be described. As can be seen from the drawing, in this embodiment, the upper surface side warps 1 and 5 function as binding yarns. In the upper surface side warp 5, the intersection with the weft 11 ′ is a binding portion, and the lower surface side between the portions where the upper surface side warp 5 weaves the upper surface side wefts 9 ′ and 13 ′ from the upper surface side. Then, the lower side weft 11 ′ is passed through (shown by □) and woven from the lower side to join the upper side textile and the lower side textile.
As described above, since the lower surface side warp has a plain weave design, the lower surface side weft 11 'should be woven from the lower surface side by the lower surface side warp 5 of the lower surface side weft 11'.
Therefore, the upper surface side warp 5 functioning as the binding yarn is directed from the upper surface side to the lower surface side between the portions where the upper surface side wefts 9 ′ and 13 ′ are woven, and the lower surface side design is originally lower. The lower surface side weft 11 ′ to be woven by the layer surface side warp 5 is woven from the lower surface side, and the lower surface side warp 5 is formed by lowering the lower surface side weft 11 ′ toward the lower surface side from the lower surface side. In the woven portion, the lower surface side fabric structure is between the upper surface side and the lower surface side weft 11 ′ without incorporating the lower surface side weft 11 ′ that the lower surface side warp 5 should originally woven from the lower surface side. It can be clearly understood that the vehicle has passed through.
In addition, the upper surface side warp 5 descends to the lower surface side and the support of the warp is lost, and in the prior art, excessive dehydration locally occurs, which causes problems such as fiber carry back and splash. The lower surface side warp 5 passes between the upper surface side wefts 10 ′, 11 ′, 12 ′ and the lower surface side weft 11 ′ to supplement the upper surface side warp 5, Also on the layer surface side, the lower surface side warp 5 passes between the upper surface side and the lower surface side in order to supplement the upper surface and the lower surface side warp 5 is no longer present. It can be clearly understood that the lower surface side weft 11 'is woven and supplemented by descending to the layer surface side, so that the upper surface side warp and the lower surface side warp complement each other.
Further, since the position at which the upper surface side warp weaves the lower surface side weft is the position at which the lower surface side warp should originally weave the lower surface side weft, the upper surface side structure and the lower surface side structure may be substantially collapsed. In addition, the wire mark characteristics and the like are improved.
In this embodiment, the ratio of the upper surface side weft to the lower surface side weft is set to 2: 1, the warp functioning as the binding yarn is arranged at a ratio of 1/4, and the upper surface side weft is After weaving the upper side weft four times from the upper side, the lower side weft was woven from the lower side toward the lower side. Of course, the present invention is not limited to this, but it is preferable because of good balance of ventilation, rigidity, wire mark property and the like.
If you want to increase the binding force of the upper and lower fabrics, it is sufficient to increase the ratio of the warp that functions as a binding yarn or increase the number of binding parts, and if you want to increase the air permeability, it functions as a binding yarn What is necessary is just to reduce the ratio of the warp or the number of the joints.
FIG. 2 is a cross-sectional view along a warp cut along the line AA ′ in FIG. The lower surface side warp complements the part where the upper surface side warp disappears toward the lower side, except for the part where the warp weaves the upper surface side weft from the upper surface side, except for the upper surface side weft. It can be clearly understood that there is always a warp between the lower surface side weft and a local excessive dehydration due to the absence of the warp, and there is no portion causing problems such as fiber carry back and splash.
[0014]
Conventional Example FIG. 3 is a design diagram showing a complete structure of a conventional example disclosed in European Patent EP 0889160 A1. FIG. 4 is a cross-sectional view along the warp cut along the line BB ′ in FIG. As can be seen from the drawing, the basic structure of the upper and lower fabrics is the same as that of the embodiment, but the structure of the connecting portion is different and there is a problem.
The upper surface side warps 1 and 5 function as binding yarns, and in the upper surface side warp 5, the intersection with the weft 11 ′ is a binding portion. The upper surface side warp 5 descends below the portion where the upper surface side wefts 9 ′ and 13 ′ are woven, passes below the lower surface side weft 11 ′ (shown by □), and passes through the lower surface side weft 11. 'Is woven from the lower surface side, and the upper surface side fabric and the lower surface side fabric are joined. The binding portion does not exist between the upper surface side weft and the lower surface side weft, there is no support for the warp, there is excessive dehydration locally, and problems such as fiber carry back and splash occur. The part is formed.
Further, on the lower surface side of the binding portion, three warps of lower surface side warps 5 and 6 and upper surface side warp 5 are closely arranged in parallel, and the structure of the lower surface side collapses, so that a wire mark is generated. Was also the cause.
[0015]
【The invention's effect】
The industrial two-layer fabric of the present invention can increase the number of wefts without lowering drainage (air permeability) because of the above-described configuration, and also has a warp on the upper surface side at the joint. No fiber-existing state does not occur, and local excessive dehydration does not occur, so fiber support is good, fiber carryback, splash, etc. do not occur, and wire markability is good. It has the effect.
[Brief description of the drawings]
FIG. 1 is a design diagram showing a complete structure of Example 1 of the present invention.
FIG. 2 is a cross-sectional view along a warp cut along the line AA ′ in FIG.
FIG. 3 is a design diagram showing a complete structure of a conventional example.
FIG. 4 is a cross-sectional view along a warp cut along a line BB ′ in FIG. 3;
[Explanation of symbols]
Reference Signs List 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 6' weft 7 'weft 8' weft 9 'weft 10' weft 11 'weft 12 'Weft 13' Weft 14 'Weft 15' Weft 16 'Weft

Claims (2)

In an industrial two-layer fabric comprising an upper surface side woven fabric composed of an upper surface side warp and an upper surface side weft and a lower surface side woven fabric composed of a lower surface side warp and a lower surface side weft, the upper surface side warp is completely The lower surface to which the lower surface side warp should be woven toward the lower surface side between the portions where one or more upper surface side warps weave the upper surface side weft from the upper surface side in the structure. The upper surface side warp woven from the lower surface side to function as a binding yarn, while the lower surface side warp is a portion where the upper surface side warp woven the lower surface side weft from the lower surface side. An industrial two-layer fabric characterized in that the lower surface side warp is to be woven on the fabric structure and passes between the upper surface side and the lower surface side without weaving the lower surface side weft. The upper surface side weave is a repetition of a structure in which the upper surface side warp passes under three upper surface side wefts continuous and then passes under one upper surface side warp. Is a repetition of a structure in which a long crimp is formed on the upper surface side through the upper side of three continuous upper surface side warps and then passes below one upper surface side warp, and the lower surface side fabric structure is 2. The industrial two-layer fabric according to claim 1, wherein the lower surface side warp has a plain weave structure of a ridge weave structure in which two warps are arranged in the same structure in parallel. 3.

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