JP3925915B2 - Industrial two-layer fabric - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper fabric, a nonwoven fabric fabric, a fabric used for dewatering and squeezing sludge and the like, an industrial fabric such as a belt for building materials and a conveyor belt, and more particularly for a paper fabric, especially for tissue production. The present invention relates to a papermaking fabric.
[0002]
[Prior art]
Conventionally used industrial fabrics include, for example, papermaking fabrics, paper fabrics such as canvases, nonwoven fabric manufacturing fabrics, fabrics used for dewatering and squeezing sludge, belts for manufacturing building materials, conveyor belts, etc. There are things. Since these industrial fabrics travel 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 to prevent meandering and wrinkles. In addition, wear resistance is also required because the wear is caused by contact with the driving roll during traveling. In addition, the surface is required to be smooth from the viewpoint of placing or transporting or processing an object on the surface.
Such a problem is an almost common problem in industrial fabrics, but it has not been solved yet. In addition to the above-mentioned performances, papermaking fabrics that require the most stringent performance of industrial fabrics are required to have various performances unique to papermaking as described below. Therefore, 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, placed between rolls of a papermaking machine, and supplied onto a running papermaking fabric. The side on which the raw material for the papermaking fabric is supplied is the upper layer surface, and the opposite side is the lower layer surface.
The supplied raw material moves as the papermaking fabric travels. During the movement, moisture is removed by a centrifugal force or a dehydrator such as a suction box or foil installed on the lower side of the fabric, forming a wet paper web. Is done. That is, the papermaking fabric functions as a filter and separates pulp fibers and water.
The wet paper formed in this papermaking zone is then transferred to the press zone and the dryer zone. In the press zone, the wet paper is transferred by a papermaking felt and squeezed together with a papermaking felt by a nip pressure between press rolls, and further moisture is removed. In the dryer zone, the wet paper is transported by a papermaking canvas and dried to produce paper.
Papermaking fabrics are woven with a loom using warps and wefts such as synthetic resin monofilaments. In order to form it endlessly, it is formed endlessly by a known weaving joint, pin seam or the like, or endlessly formed by a bag weaving machine at the stage of weaving. In the case of bag weaving, the relationship between warp and weft is reversed on the loom and in use.
In this specification, the warp is a yarn extending in the machine direction of the papermaking machine, that is, the fabric traveling direction, and the weft is a thread extending in the cross machine direction of the papermaking machine, that is, the width direction of the fabric.
By the way, in order to effectively improve the supportability of the fiber and to produce a good quality paper without generating a wire mark on the paper, the fiber is preferably supported by the weft from the relationship of the orientation of the fiber. This is very important. In particular, in a papermaking fabric for producing a tissue, since the tissue is very thin and the papermaking machine is high speed and the dewatering zone is short, fiber support and paper peelability are particularly required. Poor fiber support and paper peelability can lead to pinholes, which can cause not only apparent problems, but also a decrease in opacity and paper strength, as well as fiber carry back and splash. It becomes a big problem in operation.
Therefore, conventionally, as a papermaking fabric for producing a tissue, a type of single-layer fabric in which wefts form a long crimp on the upper surface side has been used. This is because tissue machines, in most cases, contain little or no filler, and therefore place greater importance on fiber support and paper peelability than wear resistance. However, single layer woven fabrics are unable to cope with the increasing mechanical load of paper machines that are increasing in speed. Single-layer fabrics have advantages such as good drainage due to thin net thickness, but disadvantages such as poor formation, poor running properties and poor retention due to insufficient rigidity due to the structure have become very large It is.
Therefore, recently, the use of multiple fabrics in tissue machines has increased, and it has been moderately successful. The structure of the multiple fabric is an upper and lower two-layer fabric structure in which the upper and lower fabrics are combined using a double weft yarn or a binding yarn, and the weft yarn forms a long crimp on the upper layer surface side as a structure on the upper layer surface side. Structure. In addition, for double-layered fabrics, a plain weave fabric structure in which the lower layer side fabric is arranged with two warps aligned in parallel for the purpose of ensuring a good dewaterability and reducing the net thickness in order to ensure small water retention. Is used exclusively.
In addition, recently, a double-layer fabric of a ground yarn binding type in which upper and lower meshes are connected by a part of the upper layer warp as disclosed in European Patent EP0889160A1 and does not have an independent binding yarn is partly included. Used. Since this type of two-layer woven fabric does not have an independent binding yarn, it was possible to increase the number of weft yarns without reducing the freeness (air permeability). Therefore, it was used with the expectation that the fiber supportability could be improved, but there was a big problem caused by the portion where the upper layer warp was bound. Since the upper layer warp functions as a binding yarn, there is no warp on the upper layer side in the portion that lies on the lower layer surface side, so that part becomes excessively dehydrated, causing fiber carry back, splash, etc. In addition, the portion was generated as a wire mark. When the horizontal mark was strong, it had an adverse effect during creping. These problems have not been solved yet.
[0003]
[Problems to be solved by the invention]
In view of the above-mentioned problems, the present invention provides a ground yarn binding type two-layer woven fabric that does not have an independent binding yarn, in which a state in which no warp is present on the upper layer surface side does not occur in the binding portion. Wire that does not cause excessive dehydration, can increase the number of weft yarns without reducing freeness (breathability), has good fiber support, and does not generate fiber carryback or splash An object of the present invention is to provide a paper fabric with good markability.
[0004]
[Means for Solving the Problems]
The present invention
“1. Upper layer side fabric composed of upper surface side warp and upper layer side weft, lower layer surface fabric composed of lower layer side warp and lower layer side weft, upper layer side warp functioning as binding yarn In an industrial fabric composed of a lower surface warp functioning as a binding yarn , the upper surface side warp functioning as a binding yarn is one or a plurality of upper surface side warps in the complete structure. Without weaving the upper surface side warp at the site where the upper surface side weft is woven, and without weaving the upper surface side weft at the site, weaving the lower surface side weft from the lower surface side toward the upper surface side toward the upper layer surface side other an upper surface side warp structureless functioning as binding yarn woven with weft upper surface side, whereas the lower surface side warp under layer surface an upper surface side warp is a lower surface side weft to function as the binding yarn It is the part weaved from the side, and the weft of the lower layer side on the fabric structure Lower surface side warp weaving is not woven the lower layer surface side weft, the other lower toward the lower side woven with upper surface side wefts not woven into the upper surface side warp toward the upper side from the upper surface side An industrial two-layer woven fabric characterized by having a weave of layer side wefts .
2. 2. The industrial two-layer woven fabric according to item 1, wherein the number of the upper surface side wefts in the region toward the lower surface side is 1 without interweaving the upper surface side wefts that the upper surface side warp weaves over the fabric structure.
3. The upper layer side fabric structure is a repetition of a structure passing through the upper side of one upper layer side weft after passing through the lower side of three upper layer side wefts in which the upper layer side warp is continuous. The lower weft fabric is a repetitive structure in which the side weft passes through the upper side of three continuous upper surface side warps and forms a long crimp on the upper surface side and then passes under the upper surface side warp. 3. The industrial two-layer woven fabric according to item 1 or 2, wherein the structure is a plain weave structure of a weave structure in which two lower surface side warps are arranged in parallel in the same structure. ".
Hereinafter, as described above, the present invention will be described using papermaking fabric as a representative.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Feature of the present invention, some or all of the upper surface side warp, the parts of the warp direction, the original upper surface side fabric design on the upper layer side warp Komu woven an upper surface side weft to weaving the upper surface side Without going to the lower surface side, the lower surface side warp should be woven from the lower surface side on the lower surface side structure, while the lower surface side warp is the lower surface side warp in part that incorporates a lower surface side weft from the lower side toward the side, upper surface side without inherent lower side on tissue lower surface side warp Komu woven the lower surface side weft to weaving the lower surface side The upper surface side weft should be woven from the upper layer side from the upper surface side. With the above configuration, since the upper surface warp functions as a binding yarn, the portion that lies under the lower surface, that is, in the papermaking fabric disclosed in the conventional European Patent EP0889160A1, the warp is on the upper surface side. The lower surface side warp rises to the upper surface side and compensates for the upper surface side warp instead of the part that was not present, locally dehydrated, causing problems such as fiber carry back and splash. It was possible to solve the problem of excessive dehydration locally.
[0006]
Incidentally, for the lower side, a portion lower surface side warp is raised on the upper surface side in order to compensate for the upper surface a lower surface side warp no longer present, the lower surface is an upper surface side warp functioning as binding yarn There is no problem because it goes down to the side to make up. That is, the upper surface side warp and the lower surface side warp functioning as binding yarns complement each other. Furthermore, in the upper surface side warp where the weft yarns complement each other and function as a binding yarn , the lower surface side wefts that the lower surface warp should originally be woven, and the lower surface side that functions as the binding yarn Since the warp is an upper surface side weft to which the upper surface side warp should be woven, the upper layer side structure and the lower layer surface structure are substantially not collapsed, and the wire mark characteristics and the like are good. Further, in the present invention, since the yarn functioning as the binding yarn is a ground yarn constituting a woven fabric structure, and is a warp yarn that is always tensioned during use, the binding yarn of a thin weft is used. Compared with, the bonding force that binds the upper layer side fabric and the lower layer side fabric is very strong, and because the force that always adheres the upper layer side fabric and the lower layer side fabric works, the adhesion is good . Accordingly, there is no problem that the binding yarn is squeezed between the two fabrics to cause internal wear and the binding force is weakened, and a gap is generated between the two fabrics or separated. Furthermore, since the present invention has a structure in which both upper and lower ground warps are connected, the adhesion is further improved. Further, when the upper surface side wefts that the upper surface side warp weaves on the fabric structure are not woven, and the number of upper layer side wefts in the region toward the lower surface side is 1, the warp functions as a normal warp and a binding yarn. The difference in the weaving length is small and advantageous in weaving.
[0007]
Further, the upper surface side fabric structure and the lower layer surface fabric structure are not particularly limited as long as the above structure can be formed, but the upper layer side fabric structure is composed of three upper layer side wefts in which the upper surface side warp is continuous. After passing through the lower side, the upper layer side weft is passed through the upper side of three consecutive upper layer side warps and is extended to the upper layer side by repeating the structure passing through the lower side of one upper layer side weft. If the structure that passes through the lower side of one upper layer side warp after the formation of the crimp is repeated, the weft will appear more on the upper layer side, which is the papermaking surface side, and the fiber support will be better and the lower surface side If the weave structure is a plain weave structure with a warp weave structure in which two lower surface side warps are arranged in parallel, the same state as when a thin flat yarn is used for the warp, and the crimp length of the weft is also shortened Good fiber support, because the net thickness can be reduced Peeling resistance, is particularly suitable papermaking fabrics for tissue manufacture thinness of AmiAtsu is particularly required.
[0008]
In addition, the density of the number of yarns with respect to the upper surface side fabric is not particularly limited, and the lower surface side wefts can have the same density as the upper surface side or a density such as 1/2 or 2/3.
The yarn used in the present invention can be freely selected depending on the properties 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 called stretch yarn, molding yarn, or these are combined together Can be used. In addition, the cross-sectional shape of the yarn is not limited to a circle, and a rectangular yarn such as a square shape or a star shape, an elliptical shape, a hollow yarn, or the like can be used. In addition, the material of the yarn can be freely selected, and polyester, nylon, polyphenylene sulfide, polyfluorinated vinylidene, 4 fluoroethylene, polypro, aramid, polyetheretherketone, polyethylene naphthalate, cotton, wool, metal, etc. are used. it can. Of course, you may use the thread | yarn which blended and contained various substances according to the objective to these copolymers or these materials.
In general, it is preferable to use a polyester monofilament having rigidity and excellent dimensional stability for the upper surface warp, the lower surface warp and the upper surface weft. In addition, the lower surface side wefts that require wear resistance can be improved in wear resistance while ensuring rigidity by interweaving polyester monofilaments and nylon monofilaments.
In addition, on the structure, a plurality of yarns can be arranged in the same structure where a single thread is originally arranged. By arranging a plurality of thin wire diameter yarns, the surface property can be improved and the thickness of the fabric can be reduced.
[0009]
【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 embodiment of the present invention. The complete structure is a minimum repeating unit of the woven structure, and this complete structure is connected vertically and horizontally to form the entire structure of the woven 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, X indicates that the upper surface side warp is located above the upper surface side weft, ○ indicates that the lower surface side warp is located below the lower surface side weft, ▲ The mark indicates the part where the lower surface warp is located above the upper surface side weft, that is, the connecting portion where the lower surface warp functions as the binding yarn, and □ indicates the upper surface side warp is the lower surface. A portion located below the side weft, that is, a binding portion where the upper surface side warp functions as a binding yarn is shown.
The upper surface side and lower surface side warps and wefts are arranged one above the other. In the design drawing, the upper and lower warp yarns are arranged so that the yarns are accurately overlapped vertically, and the lower surface warp and the weft yarn are arranged just below the weft yarn. In an actual fabric, it may be displaced. In this embodiment, since the lower surface side fabric is a warp weave structure in which two adjacent warps are the same structure, the two lower surface side warps are actually arranged adjacent to each other.
[0010]
Example 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, and 8 are warps, and the upper surface side warp and the lower surface side warp are arranged vertically. 1 ′, 2 ′, 3 ′... 16 ′ are wefts, the upper surface side wefts are arranged on the upper side, and the lower surface side wefts are half-numbered and the odd-numbered upper surface side wefts 1 ′, 3 ′.・ It is located on the lower side. First, when looking at the upper layer side fabric, for example, the upper layer side weft 4 'passes through the upper side of the three upper layer side warps 1, 2, 3 and then passes under the upper layer side warp 4 Then, the upper side of the three upper surface side warps 5, 6 and 7 was passed, then the lower side of one upper surface side warp 8 was passed, and the upper side of three consecutive upper surface side warps passed It turns out that it is the structure | tissue which passes the lower side of one back upper surface side warp. On the other hand, the upper surface side warp 4 passes under the three upper surface side wefts 1 ′, 2 ′, 3 ′, then passes over the upper surface side weft 4 ′, and then the three upper surface surfaces. After passing through the lower side of the side wefts 5 ', 6', 7 ', and then passing through the upper side of one upper surface side weft 8', after passing through the lower side of three consecutive upper surface side wefts 1 It can be seen that the structure passes over the upper surface side wefts of the book. Since the upper surface side weft has a structure that forms a long crimp for three upper surface side warps on the upper surface side, the fiber support of the weft is good. It can be seen that the upper surface side warp is a twill weave structure which is sequentially arranged by shifting upward by one upper surface side weft. In the present embodiment, the above-described structure is adopted, but of course not limited to this. A satin weave structure may be used, and the weft crimp may be longer or shorter. When the twill weave structure is used, the limit number of weft threads can be increased as compared with the satin weave structure. Therefore, if there is no problem in ventilation, the number of weft threads can be increased, which is advantageous when it is desired to improve fiber support. Next, looking at the lower surface side fabric, it can be seen that the lower surface side warp yarns 1 and 2, 3 and 4, 5 and 6, and 7 and 8 are plain weave weaves arranged in the same structure. The net thickness can be reduced, and is particularly suitable for a papermaking fabric for tissue production. In an actual woven fabric, the lower surface side warps 1 and 2 are arranged in close contact with each other below the upper surface side warps 1 and 2. The advantage of having a woven weave structure is the same as using a thick warp having a cross-sectional area equivalent to two, so the net thickness is reduced. There is a point that can be formed more in the weft wear type. Next, the connecting portion will be described. As can be seen from the drawings, in this embodiment, the upper surface side warps 1, 5 and the lower surface side warps 1, 5 function as binding yarns. In the upper surface side warp 5 and the lower surface side warp 5, the intersection with the weft 9 ′ is a connecting portion, and the upper surface side warp 5 passes under the lower surface side weft 9 ′ (indicated by □) ) And weaving the lower surface side weft 9 'from the lower surface side, and the lower surface side warp 5 passes above the upper surface surface weft 9' (shown by ▲) and passes the upper surface side weft 9 'from the upper surface side. By interweaving, the upper surface side fabric and the lower layer surface fabric are combined. By the way, as described above, the upper surface side warp is a structure passing through the lower side of three continuous upper surface side wefts and then passing the upper side of one upper surface side weft, and the lower surface warp is a plain weave. Since it is a structure, the upper surface side weft 9 ′ should be woven from the upper surface side, and the lower surface side weft 9 ′ should be the lower surface side warp 5. Should be woven from the bottom side. Accordingly, the upper surface side warp functioning as a binding yarn is directed to the lower surface side without weaving the upper surface side weft that the upper layer surface warp should originally be woven from the upper layer side on the upper surface side fabric structure, On the lower surface side structure, the lower surface side wefts that should be woven by the lower surface side warp are woven from the lower surface side, and the lower surface warp functioning as a binding yarn is the lower surface side of the upper surface side warp toward the lower surface side. In the part where the side wefts are woven from the lower surface side, the lower surface side warp structure is essentially directed to the upper surface side without weaving the lower surface warp that should be woven from the lower surface side once. It can be well understood that the upper surface side weft is woven from the upper surface side, which should originally be woven from the upper surface side warp on the layer surface side fabric structure. In addition, the upper surface side warp is lowered to the lower surface side and the support of the warp is lost, and in the conventional technology, the portion that has been excessively dehydrated locally causing problems such as fiber carry back and splash. The lower surface warp rises to the upper surface side and compensates for the upper surface side warp, and also on the lower surface side, the lower surface warp rises to the upper surface side to supplement the upper surface. The part where the lower surface warp does not exist is compensated by lowering the upper surface side warp to the lower surface side, and it is well understood that the upper surface side warp and the lower surface side warp complement each other it can. The upper surface side warp is the lower surface side weft that should be woven by the lower surface side warp, and the lower surface side warp is the upper layer surface that the upper surface side warp should originally be woven. Since it is a side weft, the upper layer surface side structure and the lower layer surface side structure are not substantially collapsed, and the wire mark characteristics and the like are improved. In this example, the ratio of the upper surface side weft and the lower surface side weft is 2: 1, the warp functioning as a binding yarn is arranged at a ratio of 1/4, and the upper surface side warp is After weaving the upper surface side weft three times from the upper surface side, the lower surface side weft is woven from the lower surface side toward the lower surface side, and the lower surface side warp is the lower surface side weft After weaving three times, the upper surface side wefts were woven from the upper surface side toward the upper surface side. Of course, this ratio is not limited to this, but this ratio is preferable because it provides a 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, you can increase the ratio of warps that function as binding yarns or increase the number of binding parts. If you want to increase the air permeability, it functions as a binding yarn. What is necessary is just to reduce the ratio of warp and to reduce the number of connecting parts. FIG. 2 is a cross-sectional view along the warp cut along the line AA ′ in FIG. 1 .
[0011]
Conventional Example FIG. 3 is a design diagram showing a complete structure of a conventional example disclosed in European Patent EP0889160A1. FIG. 4 is a cross-sectional view along the warp cut along the line BB ′ in FIG. 3. As can be seen from the drawings, the basic structure of the upper and lower fabrics is the same as that of the example, but there is a problem because the structure of the connecting portion is different.
The upper surface side warps 1 and 5 function as binding yarns. In the upper surface side warps 5, the intersections with the wefts 11 'serve as binding portions. The upper surface side warp 5 descends downward between the portions where the upper surface surface wefts 9 'and 13' are woven, and passes below the lower surface surface weft 11 '(shown by □) to lower layer surface side weft 11 'Is woven from the lower surface side, and the upper surface side fabric and the lower layer surface fabric are combined. At the connection part, the warp does not exist between the upper surface side weft and the lower surface side weft, the support of the warp is lost, and excessive dehydration occurs locally, causing problems such as fiber carry back and splash. A part to be generated is formed.
In addition, on the lower layer side of the connecting portion, three warps of the lower layer side warps 5 and 6 and the upper layer side warp 5 are closely arranged in parallel, and the structure on the lower layer side collapses, so that a wire mark is generated. It was also the cause of.
[0012]
Comparison of actual machine test The actual machine test was carried out by putting the fabric of the example shown in FIG. 1 and the conventional fabric shown in FIG. 3 into a paper machine for actual tissue production. When the conventional woven fabric was used, at the papermaking speed of 1,800 m / min, there were many fiber carry backs and splashes, many pinholes were generated, the papermaking speed had to be reduced, and the horizontal marks on the paper were conspicuous. In the woven fabrics of the examples, even when the paper making speed was 1,800 m / min, no individual problems occurred, and good paper making was possible.
[0013]
【The invention's effect】
Since the industrial two-layer woven fabric of the present invention has the above-described configuration, it is possible to increase the number of weft yarns without reducing the freeness (breathability), and the warp on the upper surface side in the connecting portion. No state that does not exist, local excessive dehydration does not occur, fiber support is good, fiber carry back, splash, etc. do not occur, wire mark properties are also excellent Has an effect.
[Brief description of the drawings]
FIG. 1 is a design diagram showing a complete structure of Example 1 of the present invention.
2 is a cross-sectional view along a warp cut along the line AA ′ in FIG. 1;
FIG. 3 is a design diagram showing a complete structure of a conventional example.
4 is a cross-sectional view along a warp cut along line BB ′ in FIG. 3;
[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 6' weft 7 'weft 8' weft 9 'weft 10' weft 11 'weft 12 'Weft 13' Weft 14 'Weft 15' Weft 16 'Weft

Claims (3)

Upper layer side fabric composed of upper layer side warp and upper layer side weft, lower layer side fabric composed of lower layer side warp and lower layer side weft, upper layer side warp functioning as binding yarn, binding in industrial fabric comprising a lower surface side warp functioning as a yarn, a cloth on the upper surface side weft yarns upper surface side warp has an upper surface side warp at 1 or more positions of complete tissue that serves as a binding yarn not woven on layer side weft yarns at the site interworking, a write structureless woven another upper surface side weft yarns toward the upper surface side incorporate a lower surface side weft from the lower side toward the lower layer side, on the other hand lower surface side warps site interwoven upper surface side warp is a lower surface side weft from the lower layer side that functions as the binding yarn, not woven the lower surface side weft, an upper surface side toward the upper side under incorporate the upper surface side weft warp is not woven from the upper surface side Industrial two-layer fabric which is a tissue interworking another lower surface side weft toward the surface side.  The industrial two-layer woven fabric according to claim 1, wherein the number of the upper surface side wefts in the region toward the lower surface side is 1 without interweaving the upper surface side wefts that the upper surface side warp weaves on the fabric structure.  The upper surface side weave structure is a repetition of the structure passing through the upper side of one upper layer side weft after passing through the lower side of three upper layer side wefts in which the upper surface side warp is continuous, and the upper surface side weft Is a repetition of a structure passing through the upper side of three continuous upper surface side warps and passing a lower side of one upper surface side warp after forming a long crimp on the upper surface side. The industrial two-layer woven fabric according to claim 1 or 2, wherein the lower surface side warp is a plain weave structure of a warp weave structure in which two parallel warps are arranged in parallel.

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