JP3900037B2 - 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.
[0003]
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 the tissue machine contains almost no filler and therefore places importance on fiber support and paper peelability rather than abrasion 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, in a two-layer fabric, a plain weave plain weave structure in which the lower surface side fabrics are arranged with two warps aligned in parallel for the purpose of reducing the net thickness in order to ensure drainage and small water retention. in use.
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 expected and used that the fiber supportability could be improved, but there was a big problem due to 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 side, so excessive dehydration occurs locally in that portion, causing fiber carry back, splash, etc. In addition, the portion is generated as a horizontal mark, and when it is strong, it has a bad influence during creping. This problem has not been solved yet.
[0004]
[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.
[0005]
[Means for Solving the Problems]
The present invention
“1. 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, lower layer side warp functioning as binding yarn, In the industrial two-layer woven fabric, the at least one of the warp yarns constituting the complete structure is a lower surface side warp functioning as a binding yarn, and the upper layer surface side warp arranged above and below is the upper layer surface side weft. at sites weaving from the side, the cloth has an upper surface side warp passes between the upper surface side wefts and lower surface side wefts without woven one or more times upper surface side wefts to incorporate the upper surface side warp The lower surface side warp functioning as one binding yarn is the upper layer surface side where the upper layer surface warp is not woven toward the upper layer surface side at a portion where the upper surface side warp is not woven one or more times. Weft yarn is weaved from the upper surface side to make a binding yarn Industrial two-layer fabric, which is a lower surface side warp to ability machine Te.
2. The lower surface warp is a portion where the upper surface warp did not weave the upper surface weft one or more times , the lower surface weft was not woven, and the upper surface warp was not woven toward the upper surface. 2. The industrial two- layer fabric according to item 1, which is a lower surface warp that functions as a binding yarn by weaving layer surface side wefts from the upper surface side.
3. Upper side weave is a repetition of the tissue through the upper one upper surface side weft yarn after passing through the lower of the three upper surface side wefts upper surface side warp is continuous, upper surface side wefts Is a repetition of a structure passing through the lower side of one upper layer side warp after forming a long crimp on the upper layer side through the upper side of three continuous upper layer side warp, The two-layer industrial woven fabric according to item 1 or 2, characterized in that it is a plain weave structure of a warp weave structure in which two lower surface side warps are arranged in parallel in the same structure. "
About.
Hereinafter, as described above, the present invention will be described using papermaking fabric as a representative.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is composed of an upper layer side warp, an upper layer side weft, a lower layer side warp, a lower layer side weft, and a lower layer side warp that functions as a binding yarn, and part or all of the upper layer side warp However, in the portion where the upper surface side warp in the portion in the warp direction weaves the upper surface side weft from the upper layer side, the upper surface side weft to be woven by the upper surface side warp is not woven one or more times on the fabric structure. and passed through the space between the upper surface side wefts and lower surface side wefts, and then a upper surface side warp to weave normally the upper surface side wefts to interworking next, whereas the lower surface side warp functioning as binding yarns In the portion where the upper surface side warp is not woven, the lower surface side warp which functions as a binding yarn by weaving the upper surface side weft from the upper surface side which is not woven into the upper surface side toward the upper surface side. There is a feature in being.
With the above configuration, since the conventional upper surface side warp functions as a binding yarn, the portion that lies on the lower surface side, such as the paper fabric disclosed in European Patent EP0889160A1, has warp on the upper surface side. It becomes a nonexistent state, resulting in excessive dehydration locally, and a part that has caused problems such as fiber carry back and splash is not formed.
[0007]
That is, since the upper surface side warp functions as a binding yarn as in the conventional example, it does not dive on the lower surface side, and in the present invention, it passes between the upper surface side weft and the lower surface side weft to provide fiber support. In order to secure it, the problem of excessive dehydration could be solved.
And in this part, the lower layer side warp functions as a binding yarn by weaving the upper layer side weft from the upper layer side toward the upper layer side, and connects the upper layer side fabric and the lower layer side fabric. is there.
Furthermore, the position where the lower surface side warp weaves the upper surface side weft is the upper surface side weft that the upper surface side warp should originally be woven.Therefore, the upper surface side structure is not substantially collapsed, and the wire mark characteristics, etc. It is good.
In addition, since the present invention has a structure that is bound by ground warp, the yarn that functions as the binding yarn is the ground yarn, and since it is a warp to which tension is always applied during use, the binding of thin wefts is possible. Compared to the case of using yarn, the bonding force that bonds 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, Good properties. 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.
[0008]
Further, the upper layer side fabric structure and the lower layer side 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 sides on which the upper layer side warp is continuous. after passing through the lower weft, in repetitive organization through one upper surface side weft upper side of the thread, upper surface side weft, an upper surface side through the upper three upper surface side warp successive When the structure passes through the lower side of one upper layer side warp after forming a long crimp on the upper side, it becomes a structure in which wefts often appear on the upper layer side, which is the papermaking surface side, A plain weave structure with a warp weave structure in which two lower surface side warps are arranged in parallel in the same structure is the same as when a thin flat yarn is used for the warp, and the crimp length of the upper weft is shortened. Therefore, because the structure is thin, good fiber support and paper peelability It is particularly suitable to papermaking fabrics for tissue manufacture thinness of AmiAtsu is particularly required.
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 that of the upper layer surface side or a density such as 1/2 or 2/3.
Of course, surface polishing can be carried out for the purpose of reducing the thickness or improving the smoothness. However, in fabrics for papermaking for tissue manufacture and fabrics for non-woven fabric manufacture, sufficient attention must be paid to polishing burrs so that fibers do not get caught and defective sheet peeling occurs.
[0009]
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.
[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 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.
[0011]
Example 1
FIG. 1 is a design diagram showing the 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 wefts form a long crimp of three upper surface side warps on the upper surface side, the fiber support of the wefts becomes good. It can be seen that the upper surface side warp is a twill weave which is sequentially arranged by shifting upward by one upper surface side weft. In the present embodiment, the above-described structure is adopted, but the present invention is of course not limited to this. A satin weave structure may be used, and the weft crimp may be longer or shorter. If 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.
Next, the lower surface side fabrics are arranged in the same structure in which the lower surface side warps 1 and 2, 3 and 4, 5 and 6, and 7 and 8 pass alternately above and below the same lower surface side weft. A plain weave organization. Such a structure makes it possible to reduce the net thickness, and is particularly suitable as 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 formed in the weft wear type.
Next, the connecting portion will be described. As can be seen from the drawing, in this embodiment, the lower surface warp yarns 1 and 5 function as binding yarns. In the lower surface warp 5, the intersection with the upper surface weft 9 ′ is a connecting portion, and the lower surface warp 5 passes above the upper surface side weft 9 ′ (shown by ▲). The layer surface side wefts 9 'are woven from the upper layer surface side to join the upper layer surface side fabric and the lower layer surface side fabric.
By the way, as described above, the upper surface side warp is a structure that passes through the lower side of three continuous upper surface side wefts and then passes the upper side of one upper surface side weft. For example, the upper surface side weft 9 ′ should be woven from the upper surface side by the upper surface side warp 5.
Therefore, the upper surface side warp 5 is formed on the upper layer side weft and the lower surface side without having to weave the upper surface side weft 9 'which the upper surface side warp 5 should originally weave from the upper layer side without weaving once. It passes between the wefts.
The lower surface warp 5 that functions as a binding yarn is a portion where the upper surface warp 5 passes between the upper surface side weft and the lower surface side weft without weaving the upper surface surface weft 9 '. On the lower surface side fabric structure, the lower surface side warp 5 goes to the upper layer surface side without weaving the lower surface side weft 9 'to be woven from the lower surface side, and the upper surface side fabric structure is essentially the upper layer surface. It can be well understood that the upper surface side weft 9 ′ that the side warp 5 should be woven is woven from the upper surface side.
By having such a structure, the upper surface side warp 5 in the prior art functions as a binding yarn, so that it does not descend to the lower surface side, and there is no support for the warp. It can be well understood that the portion that caused problems such as fiber carry back and splash is not formed due to excessive dehydration.
The lower layer surface side warp functioning as binding yarn is woven with upper surface side wefts position, because it is an upper surface side weft originally should weaving is an upper surface side warp, virtually without upper side tissue is lost Also, the wire mark characteristics and the like are improved.
In this embodiment, the co-woven part has formed the part originally on the layer surface side warp upper layer side weave on has not woven once upper layer surface side weft to weaving the upper layer side, of course this However, the present invention is not limited to this, and it may be formed as in Example 2 described later. Forming as in the present embodiment has the advantage that the lower surface warp is inclined gently at the joint, and the surface smoothness is improved without drawing the upper surface side abruptly. Of course, the structure on the lower surface side will collapse, but on the lower surface side, and in this example, the lower surface warp is a knot weave structure, so it is adjacent to the lower surface warp that functions as a binding yarn. In addition, since the lower surface side warp of the original woven structure is disposed, the papermaking characteristics are not adversely affected.
In this embodiment, the ratio of the upper surface side weft to the lower surface side weft is 2: 1, the warps that function as binding yarns are arranged at a ratio of 1/4, and the lower surface that functions as the binding yarns. The side warp has a structure in which the lower surface side weft is woven three times from the lower surface side and then the upper surface side weft is 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.
[0012]
Example 2
FIG. 3 is a design diagram showing the complete structure of Example 2 of the present invention.
In Example 1, the lower surface warp is lower than the lower surface on the lower surface side fabric structure at the connecting portion, and the lower surface side warp should be woven from the lower surface side without weaving the lower surface side weft once. The upper layer side weft was woven from the upper layer side, but in this example, the lower layer side warp functioning as a binding yarn immediately after weaving the lower layer side weft to be woven from the lower layer side. The upper surface side weft is woven from the upper surface side toward the side, and then the lower surface side weft to be woven from the lower surface side is then woven from the lower surface side to the lower surface side. By adopting this structure, the structure on the lower surface side is not substantially destroyed, and the wire mark characteristics and the like are further improved.
FIG. 4 is a cross-sectional view along the warp cut along the line BB ′ in FIG. 3 .
Immediately after weaving the lower surface side weft 11 'to be woven from the lower surface side, the lower surface warp 5 functioning as a binding yarn, weaving the upper surface side weft 13' toward the upper surface side from the upper layer side, next Ide immediately woven structures the lower layer surface side weft 15 'toward the lower side, the lower surface side lower side and passes alternately above and below the weft organization does not have collapsed well understood.
[0013]
Conventional Example FIG. 5 is a design diagram showing a complete structure of a conventional example disclosed in European Patent EP0889160A1. FIG. 6 is a cross-sectional view along the warp cut along the line CC ′ of FIG. 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. The warp yarns on both the upper and lower layers are gathered under the lower surface side wefts at the joint, and there is no warp between the upper surface side wefts and the lower surface side wefts. In other words, excessive dehydration occurs, and a part that causes problems such as fiber carry back and splash 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.
[0014]
【The invention's effect】
The industrial two-layer woven fabric of the present invention can increase the number of weft yarns without lowering the freeness (breathability), and a state where no warp yarn is present on the upper layer surface side at the connecting portion occurs. In addition, since there is no occurrence of localized excessive dehydration, the fiber support is good, the fiber carry back, the splash and the like are not generated, and the wire mark property is also excellent.
[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 Example 2 of the present invention.
4 is a cross-sectional view along a warp cut along line BB ′ in FIG. 3;
FIG. 5 is a design diagram showing a complete structure of a conventional example.
6 is a cross-sectional view along the warp cut along the line CC ′ of FIG. 5. FIG.
[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)

An industry consisting of an upper layer side fabric composed of upper layer side warps and upper layer side wefts, a lower layer surface fabric composed of lower layer side warps and lower layer side wefts, and a lower layer side warp functioning as a binding yarn In the two-layer fabric for use, at least one of the warps constituting the complete structure is a lower surface warp that functions as a binding yarn, and the upper surface warp arranged above and below is woven from the upper surface side weft from the upper surface side at a site, the cloth has an upper surface side warp passes between the upper surface side wefts and lower surface side wefts without woven one or more times upper surface side wefts to incorporate the upper surface side warp, On the other hand , the lower surface warp, which functions as a binding yarn, is a part where the upper surface side warp is not woven one or more times , and the upper surface side weft is not woven toward the upper surface side. functions as a binding yarn woven from the layer surface side Industrial two-layer fabric, which is a lower surface side warp that. The lower surface warp is a portion where the upper surface warp did not weave the upper surface weft one or more times , the lower surface weft was not woven, and the upper surface warp was not woven toward the upper surface. The industrial two- layer woven fabric according to claim 1, which is a lower surface warp that functions as a binding yarn by weaving layer surface side wefts from the upper surface side. Upper side weave is a repetition of the tissue through the upper one upper surface side weft yarn after passing through the lower of the three upper surface side wefts upper surface side warp is continuous, upper surface side wefts Is a repetition of a structure passing through the lower side of one upper layer side warp after forming a long crimp on the upper layer side through the upper side of three continuous upper layer side warp, 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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