JP4584398B2 - 2-layer fabric for papermaking - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fabric used for papermaking, and more particularly to a two-layer fabric for papermaking comprising a papermaking surface side fabric and a running surface side fabric.
[0002]
[Prior art]
Papermaking is a technology with a long history, and although there are changes in the equipment used, papermaking raw materials including pulp fibers are formed endlessly from the head box and run between the rolls of the papermaking machine. Supplied on fabric.
The side on which the raw material for the papermaking fabric is supplied is the papermaking surface, and the opposite side is the running surface. The supplied raw material moves as the papermaking fabric travels, and during the movement, moisture is removed by a dewatering device such as a suction box or foil installed on the traveling surface side of the fabric to form wet paper. That is, the papermaking fabric functions as a filter and separates pulp fibers and water. The wet paper formed in this papermaking zone is transferred to the next press zone and dryer zone.
In the press zone, the wet paper is transferred by a papermaking felt, and is squeezed by a nip pressure between the press rolls together with the papermaking felt, and moisture is further 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 machine crossing direction of the papermaking machine, that is, the width direction of the fabric. .
[0003]
There are more demands than ever for papermaking fabrics, especially papermaking fabrics. These include improved surface smoothness, prevention of paper wire mark generation, improved paper yield, good drainage, wear resistance, rigidity, dimensional stability, and running stability.
Various proposals have been made for these demands. In order to improve the wear resistance, measures are taken such as changing the fabric structure to a weft wear type structure or changing the material of the yarn.
In general, from the standpoint of improving the wear resistance and maintaining the posture stability of the woven fabric in use, it is preferable to give the weft yarn of the woven fabric a wear resistance action. Naturally, when the warp is worn, the tensile strength is reduced, the size of the fabric is increased, and when the warp is worn and cut by abrasion, the fabric itself is cut and the service life is exhausted. .
Attempts have also been made to use polyamide monofilaments with excellent wear resistance for wefts, but this attempt does not improve the structure of the fabric itself, but merely utilizes the properties of the materials used. Thus, the epoch-making effect cannot be obtained, and the fabric using the half-faced polyamide monofilament has a drawback that the posture stability is poor. Attempts have also been made to use thicker yarns for the wefts on the running surface, but this has problems such as the fact that the balance between the warp and the weft is lost, the crimpability is deteriorated and the wire mark is generated, and there is a problem in practical use. It was.
[0004]
In order to prevent the occurrence of paper wire marks, it is conceivable to increase the number density of warps and wefts and improve the supportability of the fibers. For this purpose, it is necessary to reduce the diameters of the warps and wefts. However, in a well-known warp / single weft / double woven fabric generally used at present, the wear resistance, rigidity, and posture stability are reduced when the wire diameter is reduced.
As described above, the paper fabric has a surface diameter that is impaired when the wire diameter is increased in order to improve wear resistance and rigidity, and a wire mark is generated on the paper. On the contrary, the wire diameter is increased in order to improve the surface property. When the number density is increased by thinning, the wear resistance and rigidity are lowered, so to speak, there are conflicting problems.
[0005]
In order to solve the above-mentioned problem, the paper making surface side and the traveling surface side are configured using separate warp and weft yarns, and an attempt is made with a woven fabric in which both layers of a two-layer fabric are integrated by a binding yarn. Has been made. In other words, a warp and weft with a small wire diameter are used for the fabric on the paper surface side to form a dense paper making surface, and a warp and weft with a large wire diameter are used for the fabric on the running surface side for running with high wear resistance. A surface is formed.
However, this was not always satisfactory. This is because, in the binding portion where the binding yarn and the yarn on the papermaking surface side intersect, the binding yarn draws the papermaking surface side fabric toward the running surface side, so that a dent occurs on the papermaking surface side fabric surface, and the paper is actually When the paper is drawn, the dent mark is generated as a wire mark so as to be transferred onto the paper.
In addition, if the wire diameter of the binding yarn is reduced or the number of binding yarns is reduced in order to reduce this dent as much as possible, the binding force will be weakened. There is a problem in that internal wear occurs between the surface side fabrics and the binding force becomes weaker, resulting in a gap between the paper surface side fabric and the running surface side fabric or separation. Soon, the service life was exhausted.
[0006]
By the way, in order to effectively improve the support of the fiber and to produce a good quality paper without generating a wire mark on the paper, it is necessary to support the fiber with a weft. This is because the pulp fibers generally supplied from the head box onto the papermaking fabric are oriented in the machine direction, that is, the warp direction. By supporting the fibers by dividing the recesses between the warps with wefts, the fibers are prevented from staying between the warps.
In order to improve rigidity, measures have been taken by stacking multiple layers of yarn in the width direction and length direction. Recently, many warp single weft triple-ply fabrics are used for papermaking. It has become.
However, with respect to the rigidity in the oblique direction, the proposal has only been made to the extent that the number of weaving warps and wefts is increased. As a matter of course, when the rigidity in the oblique direction is inferior, the woven fabric is easily deformed, and a phenomenon called a bend in which the weft is deformed into a rhombus or the weft is deformed into a bow occurs. In addition, this causes a problem that the width is reduced and the running surface is deteriorated.
In particular, when paperboard is made, since the basis weight is large, raw materials at the time of papermaking are heavy, and rigidity is required. If a woven fabric with poor rigidity is used, problems such as formation collapse and load increase occur. Further, since the raw material of the paperboard is high in temperature and the rigidity is lowered due to heat during use, a fabric having higher rigidity is required.
[0007]
[Problems to be solved by the invention]
In view of the above problems, the present invention is a woven fabric in which the papermaking surface side and the traveling surface side are configured using separate warp and weft yarns, and the woven fabrics of both layers are unified by binding yarns. For papermaking, where there are no dents on the surface of the fabric on the papermaking side at the intersection of the binding yarn and the yarn on the papermaking side, the fiber support of the weft is good, and the rigidity, especially the rigidity in the diagonal direction, is improved. A fabric is provided.
[0008]
[Means for Solving the Problems]
The present invention
“1. A paper surface side fabric composed of a paper surface side warp and a paper surface side weft, a traveling surface side fabric composed of a traveling surface side warp and a traveling surface side weft, and a paper surface side fabric and a traveling surface side fabric are joined. In the two-layer fabric for papermaking, comprising: A. The lower side of two continuous papermaking side warps after the papermaking side weft passes above the continuous three papermaking side warps B. The papermaking surface side warp passes through the upper side of a. One papermaking surface side weft, then passes below one papermaking surface side weft, and then passes through one papermaking surface side weft. passes over, then passes under the two papermaking side weft yarns, b. and a portion that passes through the upper side of one paper side weft formed on the two positions, respectively a different side A two-layer fabric for papermaking, wherein the two-layer fabric for papermaking is arranged close to or in contact with a portion passing through the upper side of one papermaking surface side weft of adjacent papermaking surface side warps.
2. The papermaking according to item 1, wherein the binding yarn is arranged on the upper side of the two papermaking surface side warps on one side of the portion where the papermaking surface side weft passes below the two continuous papermaking surface side warps 2-layer fabric.
3. The papermaking side warp 2 as described in 1 or 2, wherein the papermaking surface side warp alternately approaches or contacts adjacent wefts at a position passing over the papermaking surface side wefts, and is skewed between the positions. Layer fabric.
4). The two-layer fabric for papermaking according to item 3, wherein the skew of the papermaking side warp is a skew in the opposite direction between adjacent warps. "
About.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the papermaking surface side weft passes below the two continuous papermaking surface side warps after passing through the upper side of the three continuous papermaking surface side warps.
Further, the papermaking surface side fabric of the papermaking fabric of the present invention passes through the lower side of one papermaking surface side weft after passing through the upper side of one papermaking surface side weft in a complete structure, Next, a portion passing through the upper side of one papermaking surface side weft and then passing the lower side of the two papermaking surface side wefts, and passing through the upper side of the two papermaking surface side wefts formed Were arranged so as to be adjacent to a portion passing through the upper side of one papermaking surface side weft of papermaking surface side warps adjacent to different sides.
With this configuration, the paper surface side warp alternately approaches or contacts with the warp on both sides and becomes lateral, and is formed and arranged in an oblique direction. Thus, the rigidity in the oblique direction becomes very large.
When a portion passing through the upper side of one papermaking surface side weft is arranged so as to be adjacent to a portion passing through the upper side of one papermaking surface side weft of the adjacent papermaking surface side warp, in that portion, two continuous papermaking Since the surface side warp is woven from the lower side by the paper-making side weft, a force for bringing the paper-making side warp close together acts and the warp approaches. In addition, since the paper surface side wefts form crimps for two and three warps, the rigidity in the width direction is large, and since a long crimp for three warps is formed on the paper surface side, weft fibers Supportability becomes good.
Further, the fact that the paper surface side warp is formed laterally also contributes to the improvement of the fiber support in the weft direction, and the fiber support of the fabric is very good. Therefore, retention and sheet release are improved.
[0010]
In the present invention, when the binding yarn is arranged on one side or both sides of a portion passing through the lower side of the two papermaking surface side warps where the papermaking surface side wefts are continuous, the upper side of the two papermaking surface side warps, the papermaking Crimps for two surface side warps are formed on the paper-making surface side, and the binding yarn has the function of the fiber support yarn in addition to the original function of the binding yarn, so that the fiber support is good.
In addition, the portion where the papermaking surface side weft passes below the two continuous papermaking surface side warps is the portion where the papermaking surface side warp approaches or contacts the adjacent papermaking surface side warp. The papermaking surface side warp is further woven with the binding yarn, and the force to approach or contact the papermaking surface side warp is strengthened, and the rigidity in the oblique direction is improved. In addition, wefts that are substantially continuous to the papermaking surface side are formed by the papermaking surface side wefts and binding yarns, and the fiber support is further improved. As described above, the conventional two-layer fabric for papermaking has a dent on the surface of the paper surface side fabric because the binding yarn draws the paper surface side fabric to the running surface side. The problem of generating the wire mark as a wire mark so as to be transferred onto paper could not be solved.
The conventional binding yarn of a two-layer fabric for papermaking has had an adverse effect of appearing at various points in the papermaking fabric where the original yarn does not exist, drawing the papermaking surface and generating dents. When arranged as described above, the position where the papermaking surface side weft passes through the lower side of the papermaking surface side warp is recessed, and the binding yarn is the connecting portion located above the papermaking surface side warp, As a result, since it is arranged so as to fill the dent, there is no adverse effect as in the conventional binding yarn.
[0011]
In the present invention, one of the characteristics is that the force for connecting the paper surface side fabric and the running surface side fabric is strong.
When weaving the two yarns on the paper-making surface side from the paper-making surface side as described above, compared to the type conventionally woven with one paper-making surface side warp, It will be interwoven and the connection will be stronger. Further, since one binding yarn is arranged for one weft on the paper surface side, conventionally, the binding yarn is as in the ratio of one binding yarn for four paper side wefts. Compared to the case where the number of the is less, the binding force becomes stronger. However, the present invention is not limited to this, and one binding yarn can be arranged for a plurality of paper surface side wefts. When the binding force becomes strong, as described above, the binding yarn is not entangled between the paper surface side fabric and the running surface side fabric and internal wear does not occur, and a gap occurs between the fabrics, The problem of separation does not occur.
[0012]
The running surface side fabric is not particularly limited, but as described above, a weft yarn type structure having good wear resistance is preferable. The density of the number of yarns with respect to the paper surface side fabric is not particularly limited, and the traveling surface side warp and the traveling surface side weft may be ½ or 2/3 of the paper surface side.
However, the density of the running surface side wefts is most suitable because it is related to wear resistance. This is because if the amount is too small, the wear resistance is lowered.
[0013]
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 sublime processed textured yarn, bulky yarn, processed yarn called stretch yarn, molding yarn, etc. Combined yarns can be used. Further, the cross-sectional shape of the yarn is not limited to a circle, and a square shape, a star shape or the like, an elliptical shape, a hollow shape, or the like can be used. The material of the yarn can be freely selected, and polyester, nylon, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyether ether ketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metal, etc. are used. it can.
Of course, you may use the thread | yarn which blended or contained various substances according to the objective in the copolymer and these materials.
In general, it is preferable to use a polyester monofilament having rigidity and excellent dimensional stability for the paper surface warp, the running surface side warp, and the paper surface side weft. Further, as the binding yarn, nylon monofilament is preferably used because it is required to have wear resistance against the above-described internal wear. In addition, it is preferable to interweave polyester monofilaments and nylon monofilaments on the running surface side wefts that require abrasion resistance, such as by alternately arranging polyester monofilaments and nylon monofilaments in order to improve wear resistance while ensuring rigidity.
[0014]
Next, 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.
[0015]
FIG. 2 is a partial plan view of the paper making surface side of FIG.
In the design drawing, warps are indicated by Arabic numerals, for example, 1, 2, and 3, and wefts are indicated by Arabic numerals with dashes, for example, 1 ', 2', 3 '.
In addition, X indicates that the paper surface side warp is located above the paper surface side weft, ○ indicates that the traveling surface side warp is located below the traveling surface side weft, The mark indicates that the binding yarn is positioned above the papermaking surface side warp, and the □ mark indicates that the binding yarn is positioned below the running surface side warp.
[0016]
The warp and weft yarns on the papermaking surface side and the running surface side are arranged one above the other. In this embodiment, since the number density is the same, the warp and weft on the running surface side are arranged directly below the warp and weft on the papermaking surface side.
It should be noted that in the design drawing, the warp yarn on the paper surface side, the warp yarn on the traveling surface side just below the weft yarn, and the weft yarn are arranged so that the yarns are accurately overlapped in the vertical direction. In an actual woven fabric, it may be displaced.
[0017]
【Example】
Next, specific examples will be described with reference to examples.
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, and 5 are warps, and the paper surface side warp and the running surface side warp are arranged vertically.
Reference numerals 1 ', 3', 5 ', 7' and 9 'denote wefts, and the paper surface side wefts and the running surface side wefts are arranged vertically.
2 ', 4', 6 ', 8', 10 'are binding yarns.
First, looking at the paper surface side fabric, the paper surface side weft 1 'passes below the paper surface side warps 1, 2 and then passes above the paper surface side warps 3, 4, 5.
Therefore, it can be seen that the structure of the papermaking surface side weft 1 ′ is a repetition of the structure passing through the lower side of the two continuous papermaking surface side warps and then the upper side of the three continuous papermaking surface side warps.
In terms of the structure, the papermaking surface side weft 1 'is shifted to the right by two papermaking surface side warps and sequentially arranged with the papermaking surface side wefts 3', 5 ', 7', 9 'to form a complete structure. To do.
The papermaking surface side warp 1 passes above the papermaking surface side weft 1 ', then passes below the papermaking surface side weft 3', then passes above the papermaking surface side weft 5 ', and then the papermaking surface side weft 7'. , Pass under the 9 '.
Accordingly, the structure of the paper surface side warp 1 passes through the upper side of one paper surface side weft, then passes the lower side of one paper surface side weft, then passes the upper side of one paper surface side weft, Next, the structure passes under the two wefts on the paper-making surface side.
Then, on the structure, the papermaking surface side warp 1 is shifted upward by three papermaking surface side wefts and sequentially arranged with the papermaking surface side warps 2, 3, 4, 5 to form a complete structure.
When the paper surface side warp 3 is viewed, it passes through the upper side of the paper surface side wefts 3 'and 7', and the paper surface side warp 4 passes through the upper side of the paper surface side weft 3 '. The portion passing through the upper side of the weft 3 'is arranged next to the other, and in the portion passing through the upper side of the paper-making surface side weft 7', the portion where the paper-making surface side warp 2 passes above the paper-making surface side weft 7 ' Is located adjacent to the papermaking surface side warp 3, and the portion passing through the upper side of one papermaking surface side weft formed in two locations of the papermaking surface side warp in a complete structure is adjacent to a different side, respectively. It can be seen that the warp yarns are arranged so as to be adjacent to the portion passing through the upper side of one weft on the paper-making surface side.
By being arranged in this manner, the papermaking surface side warps 3 and 4 are arranged close to or in contact with each other at the papermaking surface side weft 3 ', and the papermaking surface side warps 3 and 2 are arranged close to each other at the papermaking surface side weft 7'. Alternatively, the paper surface side warp is alternately approached or brought into contact with the warp on both sides to be lateral, and is arranged in an oblique direction.
Next, when looking at the binding yarn, for example, the binding yarn 2 'is one side of the portion where the papermaking surface side weft 1' is arranged below the papermaking surface side warps 1 and 2, and this papermaking surface. It is arranged on the upper side of the side warps 1 and 2 to form a crimp for two paper side warps, and the binding yarn has both the function of the binding yarn and the function of the fiber support yarn.
Further, a weft crimp which is substantially continuous to the paper surface side is formed above the paper surface side warp yarns 1, 2, 3, 4 and 5 by the paper surface side weft yarn 1 'and the binding yarn 2'. Supportability becomes good.
Next, looking at the running surface side fabric, it can be seen that the running surface side weft is a weft-wearing type in which four running surface side warps are formed on the running surface side.
For example, the traveling surface side weft 3 ′ forms four crimps of traveling surface side warps 1, 2, 3, 4.
Thus, it can be well understood from the plan view of the papermaking surface shown in FIG. 2 that the papermaking surface side warps alternately come into contact with the warp yarns on both sides, become lateral, and are arranged in an oblique direction.
Further, it can be understood that the two papermaking surface side warps with which the binding yarn comes into contact are woven, so that the contact force between the papermaking surface side warps is strengthened and the rigidity in the oblique direction is improved.
[0018]
Example 2
FIG. 3 is a design diagram showing another complete structure of the present invention.
The structure of the paper surface side fabric and the running surface side fabric is the same as in the previous example, except that the binding yarn and the paper surface side fabric are woven together, and the paper surface side fabric and the running surface side fabric overlap. It is. When the binding yarn and the paper surface side fabric are woven together as in this embodiment, there is no risk that the binding yarn and the paper surface side weft cross each other, and there is an advantage that the weaving property is good.
For example, when looking at the binding yarn 6 ′, it is arranged above the papermaking surface side warp 1 and the papermaking surface side warp 2. In this position, the paper surface side warp 1 is directed from the upper side of the paper surface side weft 5 'to the lower side of the paper surface side weft 7', and the paper surface side warp 2 is directed from the lower side of the paper surface side weft 5 'to the paper surface side. Since the papermaking surface side warps 1 and 2 intersect each other toward the upper side of the weft thread 7 ', the binding yarn may enter under the papermaking surface side weft thread 5' or the papermaking surface side weft thread 7 ', or You don't have to cross the border.
[0019]
A conventional example is a normal two-layer fabric for papermaking in which the upper layer fabric is formed of a plain weave structure.
Comparative test A comparative test was conducted with Example 1 as a representative example of the present invention.
Paper-woven fabrics woven by a conventional method were cut into 100 mm squares, a 500 g load was applied in the diagonal direction, the elongation was measured, and the rigidity in the diagonal direction was compared.
The example was 0.6%, while the comparative example was 2.4%.
[0020]
【The invention's effect】
The two-layer fabric for papermaking according to the present invention is a fabric in which the papermaking surface side and the traveling surface side are configured using separate warps and wefts as described above, and the fabrics of both layers are integrated by binding yarns. Even if there is good fiber support of the weft, and the rigidity, especially the rigidity in the oblique direction is very large, the phenomenon that the fabric is deformed into a rhombus or the weft is deformed into a bow does not occur, There is no problem that the width is reduced or the running performance is deteriorated.
Moreover, even if a paperboard having a large basis weight and a high raw material temperature is produced, there is an excellent effect that problems such as collapse of the formation and an increase in load do not occur.
[Brief description of the drawings]
FIG. 1 is a design diagram showing a complete structure of an example of the present invention.
FIG. 2 is a plan view showing a paper making surface of the embodiment shown in FIG.
FIG. 3 is a design diagram showing a complete structure of another embodiment of the present invention.
[Explanation of symbols]
1 warp 2 warp 3 warp 4 warp 5 warp 1 'weft 3' weft 5 'weft 7' weft 9 'weft 2' binding yarn 4 'binding yarn 6' binding yarn 8 'binding yarn 10' binding yarn

Claims (4)

A papermaking surface side fabric composed of a papermaking surface side warp and a papermaking surface side weft, a traveling surface side fabric composed of a traveling surface side warp and a traveling surface side weft, and a connection for joining the papermaking surface side fabric and the traveling surface side fabric. In a two-layer fabric for papermaking comprising yarns, The papermaking surface side weft passes below the two continuous papermaking surface side warps after passing through the upper side of the three continuous papermaking surface side warps; The papermaking side warp is a. It passes through the lower side of one paper side weft after passing through the upper one papermaking side weft and then passes over one papermaking side weft and then two papermaking side weft yarns Passing underneath, b. In addition, a portion passing through the upper side of one papermaking surface side weft formed at the two locations approaches or comes into contact with a portion passing through the upper side of one papermaking surface side weft adjacent to a different side. A two-layer fabric for papermaking, characterized in that the two-layer fabric is arranged.   The binding yarn is arranged on the upper side of the two papermaking side warps on one side of the portion where the papermaking side weft passes below the continuous two papermaking side warps. 2-layer fabric for papermaking.   The papermaking side warp according to claim 1 or 2, wherein the papermaking side warp approaches or contacts with the adjacent wefts alternately at a position passing over the papermaking side weft, and is skewed between the positions. Layer fabric.   The two-layer woven fabric for papermaking according to claim 3, wherein the skew of the paper surface side warp is a reverse skew of adjacent warps.

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