JP4584402B2 - 2-layer fabric for papermaking - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a papermaking fabric, and more particularly to a papermaking fabric, and more particularly to a papermaking fabric for paperboard.
[0002]
[Prior art]
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 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 then transferred to the press zone and the 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 to further remove moisture. 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 machine crossing direction of the papermaking machine, that is, the width direction of the fabric. .
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 lowered, the dimension of the fabric is increased, and when the warp is worn and cut, the fabric itself is cut and the service life is exhausted.
[0004]
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.
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 problems, an attempt has been made with a woven fabric in which the papermaking surface side and the traveling surface side are configured using separate warp and weft yarns, and the fabrics of both layers are integrated by binding yarns. Yes. 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.
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 performance is deteriorated.
In particular, when paperboard is made, since the basis weight is large, the raw material at the time of papermaking is heavy, so that rigidity is particularly required. When using a woven fabric having poor rigidity, problems such as formation collapse and load increase occur. Moreover, since the raw material used for the manufacture of paperboard is high in temperature and the rigidity is lowered due to heat during use, a fabric having higher rigidity is required.
[0006]
[Problems to be solved by the invention]
In view of the above problems, the present invention has a structure in which the papermaking surface side and the running surface side are configured using separate warp and weft yarns, and the fabrics of both layers are unified by the binding yarns. In particular, the present invention provides a paper fabric having improved rigidity in an oblique direction.
[0007]
[Means for Solving the Problems]
The present invention
“1. (A) A paper-making surface side fabric composed of a paper-making surface side warp and a paper-making surface-side weft, a traveling surface-side fabric composed of a traveling surface-side warp and a traveling surface-side weft, and a paper-making surface side weft. In a two-layer paper fabric made of binding yarns, (B) one or two after the traveling surface side fabric has 7 shafts or more and the traveling surface side warp passes under one traveling surface side weft. One traveling surface side weft passing above, then passing under one traveling surface side weft, then passing over four or more traveling surface side wefts, and formed at the two locations. The portion passing through the lower side of the surface side weft is arranged so as to be adjacent to the portion passing through the lower side of one traveling surface side weft of the traveling surface side warp adjacent to each different side, and the traveling surface side weft is traveling A two-layer fabric for papermaking, characterized in that a long crimp having 5 or more running surface side warps is formed on the surface side.
2. A portion passing through the lower side of one traveling surface side weft formed in two places is adjacent to a portion passing through the lower side of one traveling surface side weft of adjacent traveling surface side warps on different sides. The two-layer fabric for papermaking according to claim 1, wherein the warp yarns are arranged in an oblique direction between portions passing through the lower side of one running surface side weft formed at two places. "
About.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The running surface side fabric of the papermaking fabric of the present invention has 7 shafts or more, and the running surface side warp passes through the lower side of one running surface side weft and then one or two running surface side wefts. One traveling surface side formed through the lower side, then passing the lower side of one traveling surface side weft, and then passing the upper side of four or more traveling surface side wefts. The portion passing through the lower side of the weft is arranged so as to be adjacent to the portion passing through the lower side of one traveling surface side weft of the traveling surface side warp adjacent to each different side, and further, the traveling surface side weft is traveling A long crimp of 5 or more running surface side warps is formed on the surface side.
With this configuration, the running surface side warp alternately approaches or contacts with the warps on both sides to become lateral, and is formed and arranged in an oblique direction. Thus, the rigidity in the oblique direction becomes very large.
If the portion passing through the lower side of one running surface side weft is arranged adjacent to the portion passing through the lower side of one running surface side weft of the adjacent running surface side warp, there are two in that portion. Since the traveling surface side warps are woven from the upper side by the traveling surface side wefts, a force for bringing the traveling surface side warps together close to each other acts and has the above-described configuration.
In addition, the running surface side wefts are woven strongly from the traveling surface side by two adjacent traveling surface side warps, and a long crimp is formed on the traveling surface side, so the wear resistance is good and the rigidity in the width direction is also good. growing. In addition, the running surface side fabric needs to be 7 shafts or more. In the present invention, the running surface side weft is strongly woven by two adjacent running surface side warps, so that with 5 shafts or less, the crimp that can be formed on the running surface is as short as 3 warps or less, and projects sharply toward the running surface side. Only a crimp can be formed, and the wear resistance is not satisfactory at all. In addition, with 6 shafts, it is possible to form a certain amount of long crimps, but the composition is distorted and the other performances are adversely affected. The density of the number of yarns for 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. If the amount is too small, the wear resistance is lowered.
[0009]
Next, embodiments of the present invention will be specifically 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.
FIG. 2 is a partial plan view of the traveling surface side of FIG.
In the design drawing, the warp is indicated by Arabic numerals, for example, 1, 2, and 3, and the weft is indicated by Arabic numerals with dashes, for example, 1 ′, 4 ′, and 7 ′.
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.
The warp and weft yarns on the papermaking surface side and the running surface side are arranged one above the other. Since the number density is the same in FIGS. 1 to 4, 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.
[0010]
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. In addition, 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.
[0011]
【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, 5, 6, 7, 8, 9, and 10 are warps, and the paper-making surface side warp and the traveling surface side warp are arranged vertically.
1 ', 4', 7 ', 10', 13 ', 16', 19 ', 22', 25 ', 28' are wefts, and the paper surface side wefts and the running surface side wefts are arranged vertically. .
2 ', 3', 5 ', 6', 8 ', 9', 11 ', 12', 14 ', 15', 17 ', 18', 20 ', 21', 23 ', 24', 26 ' 27 ', 29', 30 'are binding yarns.
First, looking at the traveling surface side fabric, the traveling surface side warp 1 passes above the traveling surface side weft 1 ', then passes below the traveling surface side weft 4', and then travel surface side wefts 7 ', 10 'passes over, then the running surface side weft 13' passes the lower, then the running surface side weft 16 ', 19', 22 ', 25', passes over the side 28 '.
Then, on the structure, the traveling surface side warp 1 is shifted upward by three traveling surface side wefts and sequentially disposed as traveling surface side warps 2, 3, 4,...
By the way, when the traveling surface side warp 3 is viewed, the traveling surface side warp 4 passes under the traveling surface side wefts 1 ′ and 22 ′, and the traveling surface side warp 4 passes through the lower side of the traveling surface side weft 1 ′. There 'is disposed adjacent a portion that extends under the running surface side weft 22' running surface side weft 1 at the portion that passes through the upper, running surface side warp 2 running surface side weft 22 ' The parts passing through the lower side are arranged next to each other.
Thus, 2 months one running surface side portion which passes through the lower weft of plants formed the running surface side warp, a lower one running surface side weft of the running surface side warp adjacent to each different side It can be seen that they are arranged adjacent to the passing part.
By being arranged in this way, the traveling surface side warps 3 and 4 are disposed close to or in contact with each other on the traveling surface side weft 1 ', and the traveling surface side warps 3 and 2 are disposed near each other on the traveling surface side weft 22'. Alternatively, they are arranged in contact with each other so that the running surface side warps alternately approach or come into contact with the running surface side warps on both sides to become lateral and are arranged in an oblique direction.
Further, the traveling surface side weft 1 ′ passes the upper side of the traveling surface side warps 3, 4, passes the lower side of the traveling surface side warps 5, 6, 7, 8, 9, 10, 1, 2, and travels A long crimp of 8 running surface side warps is formed on the side. Therefore, the wear resistance is good.
Next, when 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, and further on the paper surface. It passes under the side warps 6 and 7 and then passes over the paper surface side warps 8, 9 and 10.
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.
Then, organizational, the papermaking side weft 1 'papermaking side warp 2 duty rightward shifted sequentially papermaking side weft 4', 7 ', 10' arranged with ..................... 28 ' To form a complete structure.
The papermaking surface side warp 1 passes above the papermaking surface side weft 1 ', then passes below the papermaking surface side weft 4', then passes above the papermaking surface side weft 7 ', and then the papermaking surface side weft 10'. , 13 ', further above the papermaking surface side weft 16', then below the papermaking surface side weft 19 ', then above the papermaking surface side weft 22', and then on the papermaking surface side. It passes under the wefts 25 'and 28'.
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 texture repeats under the two papermaking side wefts.
In terms of the structure, the paper surface side warp 1 is shifted upward by three paper surface side wefts, and the paper surface side warps 2, 3, 4,... Form.
By the way, when looking at the papermaking surface side warp 3, the papermaking surface side warp 4 passes above the papermaking surface side wefts 4 'and 10', and the papermaking surface side warp 4 passes through the upper side of the papermaking surface side weft 4 '. The portions passing through the upper side of the surface side weft 4 'are arranged adjacent to each other. In the portion passing through the upper side of the paper surface side weft 10', the paper surface side warp 2 passes through the upper side of the paper surface side weft 10 '. Are placed next to each other.
Therefore, a portion passing through the upper side of one papermaking surface side weft formed at two locations on the papermaking surface side warp passes through the upper side of one papermaking surface side weft adjacent to each other on different sides. It can be seen that they are arranged adjacent to each other.
With this arrangement, the papermaking surface side warps 3 and 4 are in contact with each other at the papermaking surface side weft 4 ', and the papermaking surface side warps 3 and 2 are in contact with each other at the papermaking surface side weft 10'. The paper surface side warps alternately come into contact with the warps on both sides to be lateral, and are arranged in an oblique direction.
The same applies to the paper-making surface side wefts 19 'and 25'.
Thus, in this embodiment, the paper surface side fabric also has a structure in which the warp yarns alternately come into contact with the warp yarns on both sides in the same manner as the running surface side fabric. If comprised in this way, rigidity will become very favorable by the synergistic effect of a running surface side fabric and a paper-making surface side fabric.
Of course, the structure of the paper surface side woven fabric is not limited to the present embodiment, and a normal plain weave structure, various twill weave structures of 2/2, 1/2, 1/3, 1/4 structure or satin weave structure. Can be used.
Next, looking at the binding yarn, for example, the binding yarn 2 ′ is composed of the side of the portion where the papermaking surface side weft 1 ′ is arranged below the papermaking surface side warps 1 and 2, and the papermaking surface side weft. 4 'passes through the upper side of the papermaking surface side warps 1, 2, 8 and 9 next to the portion of the continuous papermaking surface side warps 8 and 9 that is arranged under the papermaking surface side warps 8 and 9. A crimp is formed and is woven with the running surface side fabric through the lower side of the running surface side warp 5.
Further, the binding yarn 3 ′ is a paper surface side warp where the paper surface side weft 4 ′ is continuous with the side of the portion disposed below the paper surface side warps 6, 7 where the paper surface side weft 1 ′ is continuous. Next to the portion arranged on the lower side of 3, 4 and passing through the upper side of the paper-making surface side warps 6, 7, and 3, 4, a crimp for two paper-making surface side warps is formed, and the running surface side The lower side of the warp 9 is woven with the running surface side fabric. From this, the binding yarn has both the original function of the binding yarn and the function of the fiber support yarn, and furthermore, on both sides of the portion where the papermaking surface side wefts pass under the two papermaking surface side warps. It can be seen that the weft crimp is arranged on the upper side of the two paper-making surface side warps and substantially continuous on the paper-making surface side, and the fiber support is very good.
2, 3, and 4 are design diagrams of a running surface side fabric according to another embodiment.
2 is a 9 shaft, FIG. 3 is an 8 shaft, and FIG. 4 is a 7 shaft fabric.
From the design drawing, it is understood that in any of the fabrics, the traveling surface side warps alternately approach or contact with the traveling surface side warps on both sides to become lateral and are arranged in an oblique direction.
[0012]
Conventional example The fabric on the running surface side is a normal two-layer fabric for papermaking in which the normal weft-wearing type fabric with a 4/1 satin structure and the upper layer fabric with a plain weave structure are used.
[0013]
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 0.3%, while the comparative example was 2.4%.
[0014]
【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 running surface side are configured using separate warp and weft yarns as described above, and the fabrics of both layers are integrated by binding yarns. However, the rigidity, particularly in the oblique direction, is very large, and the fabric is not deformed into a rhombus or the weft is deformed into a bow shape, causing a phenomenon called a bend, and the width is reduced or the running performance is deteriorated. there is no problem.
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 design diagram showing a complete structure of another embodiment of the present invention.
FIG. 3 is a design diagram showing a complete structure of another embodiment of the present invention.
FIG. 4 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 6 Warp 7 Warp 8 Warp 9 Warp 10 Warp 1 'Weft 4' Weft 7 'Weft 10' Weft 13 'Weft 16' Weft 19 'Weft 22' Weft 25 'Weft 28' Weft 2 'Thread 3' Thread 5 'Thread 6' Thread 8 'Thread 9' Thread 11 'Thread 12' Thread 14 'Thread 15' Thread Thread 17 'binding yarn 18' binding yarn 20 'binding yarn 21' binding yarn 23 'binding yarn 24' binding yarn 26 'binding yarn 27' binding yarn 29 'binding yarn 30' binding yarn

Claims (2)

(A) 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 binding yarn disposed between the papermaking surface side wefts (B) One or two traveling surfaces after the traveling surface side fabric has 7 shafts or more and the traveling surface side warp passes under one traveling surface side weft. One running surface side weft passing through the upper side of the side weft, then passing the lower side of one running surface side weft, then passing the upper side of four or more running surface side wefts, and formed in the two places The portion passing through the lower side is arranged so as to be adjacent to the portion passing through the lower side of one traveling surface side weft of the traveling surface side warp adjacent to each different side, and the traveling surface side weft is on the traveling surface side A two-layer fabric for papermaking, wherein the running surface side warp forms a long crimp of 5 or more.  The portion that passes through the lower side of one running surface side weft formed in two places is adjacent to the portion that passes the lower side of one running surface side weft of adjacent running surface side warps on different sides. The two-layer fabric for papermaking according to claim 1, wherein the warp yarns are arranged in an oblique direction between portions passing through the lower side of one running surface side weft formed at two places.

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