JPH0219586A - Double woven fabric for paper making - Google Patents

Abstract

PURPOSE:To improve abrasion resistance without deteriorating performance, such as freeness or wire mark, etc., by weaving polyester yarns and polyamide yarns as weft yarns in the lower layer of double woven fabric in a weave for entangling the weft yarns with warp yarns in a special state. CONSTITUTION:In a fabric weave chart, nX2 weft yarns (n is an integer of >=7) are arranged in the upper and lower layers to provide a double woven fabric. Polyester and polyamide yarns are used as weft yarns arranged in the lower layer. The yarns are woven in a complete weave in which the weft yarns of the polyamide yarns are entangled with the adjacent two warp yarns at one place and the weft yarns of the polyester yarns are entangled with the adjacent two warp yarns at two places. The wire diameter of the polyamide yarns is preferably larger than that of the polyester yarns. The polyamide and polyester yarns are preferably used at (1:3)-(3:1) ratio.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to papermaking fabrics. [Prior Art] There are more demands on papermaking fabrics than ever before. Broadly speaking, they can be divided into (a) issues related to paper quality itself, such as preventing the occurrence of wire marks and sufficient entanglement of paper fibers, or paper manufacturing yield issues, and (b) improving abrasion resistance and extending the service life of textiles. , (c) the problem of good P aqueous properties, etc. These problems are often related to each other, but roughly speaking, the problem of (b) is a problem that is largely related to the structure of the paper-making surface of the fabric. (b) is closely related to the structure of the running side surface of the fabric, and (c) is a problem regarding the fabric as a whole. These problems must be solved not only in multi-weave fabrics but also in multi-layer fabrics. Many proposals have been made for the conventional solution (a). However, sufficient efforts have not been made to solve the problem (b), that is, to improve the abrasion resistance of paper-making fabrics, and the running side of paper-making 11i8I fabrics is made of a weft-wearing type to prevent warp threads from being dragged. At rest. However, in recent years, the speed of paper production has increased, the amount of filler used has increased, and neutral paper production has increased! %! Due to various conditions such as an increase in the need for wear and tear, the abrasion resistance of papermaking fabrics has become a major issue. In order to improve such germ resistance, attempts have been made to use abrasion-resistant polyamide as the weft on the running surface of conventional papermaking III products of the weft abrasion type.
Papermaking fabrics made of polyamide have the disadvantage of being easy to stretch and having poor posture stability. Therefore, conventionally, attempts have been made to use polyester having excellent rigidity for both the warp and weft to construct papermaking fabrics that are difficult to stretch and have poor posture. FIG. 16 is a complete design drawing showing a conventionally used papermaking fabric having 16 warp and weft yarns each made of polyester. In the figure, the ○ mark indicates the position where the warp threads weave the weft threads on the running surface, and the X mark indicates the position where the warp threads weave the weft threads on the paper-making surface.Therefore, between the ○ mark and the ○ mark indicates the crimp length of the weft yarns on the running surface. In the conventional papermaking fabric shown in FIG. 16, the crimp lengths of adjacent weft yarns on the running surface are the same. However, in order to meet the above requirements, in conventional papermaking fabrics, attempts have been made to use threads with a thick diameter for the weft on the running side of papermaking fabrics, which improves abrasion resistance. Although this can be improved to some extent, the thick weft yarns disrupt the balance between the weft and warp yarns, resulting in poor crimp performance and the formation of wire marks. Furthermore, as can be understood from the problem (c) above, if the crossroads of the running surface change, the water quality of the reactor will also be affected, and the problem cannot be solved by a palliative measure such as simply making the weft thicker. [The invention tries to solve ii! Problem] In view of the problems of the conventional technology as described above, the present invention aims to improve the abrasion resistance of papermaking fabrics without adversely affecting the papermaking performance such as furnace water resistance and wire mark resistance. That is. [Means for Solving the Problem] The present invention arranges nX2 wefts (n is an integer of 7 or more) in two upper and lower layers, and the lower layer wefts are made of polyester and polyamide yarns. Polyamide weft is 1
In some places, the polyester weft yarns provide a papermaking product with a complete structure woven by two adjacent warp yarns in two places. [Function] The abrasion resistance of the running surface of the papermaking fabric is increased by increasing the abrasion volume of the abrasion fibers forming the running surface. From the viewpoint of stability of the posture of the fabric during use and extension of its service life, it is desirable that the weft yarns have an abrasion-resistant effect.This is because when the warp yarns wear out, the fabric dimensions change or breakage occurs. The papermaking fabric of the present invention in which weft yarns are arranged in a double layer, upper and lower, has excellent abrasion resistance due to the arrangement of polyester weft yarns with excellent openness and polyamide weft yarns with excellent abrasion resistance on the running surface. Excellent polyamide weft crimps can be lengthened. Furthermore, by pairing two adjacent warp yarns and intertwining them with the polyester weft yarn and the polyamide weft yarn on the running surface, the weft yarns can be bent with strong force, making it possible to use thick weft yarns. This increases the abrasion volume by forming long crimps in the wefts on the running surface without changing the surface properties of conventional papermaking fabrics, that is, the support properties of pulp fibers, and the wire mark characteristics. It greatly improves sex. In reality, at the knuckle where the warp and weft intersect and the yarn is sharply bent, there is a weft portion that does not have an anti-wear effect due to the shape of the crimp. In other words, within the same area, the smaller the number of knuckles, the better the P water resistance from the viewpoint of wear resistance. Also, is crimpability, an indicator of the ability of the warp to push and bend the weft by overcoming the repulsive force of the weft when the warp tries to bend it? The longer the distance, the better. When crimpability improves, thicker wefts can be used. In the present invention, the crimp of the polyamide weft on the running surface of the fabric is long, so the crimpability is good.
Since thicker weft yarns, which could not be used conventionally, can be arranged, the wear volume can be further increased. Furthermore, in the present invention, two adjacent warp yarns form a pair and bend the weft yarn on the running surface with strong force, so the crimp a is even better, and thicker weft yarns can be used.
Wear resistance is dramatically improved. Incidentally, the increase in wear volume and the increase in wear resistance will be specifically explained in the following example section while comparing with a conventional example. [Example] Figures 1 to 6 show the warp and weft of the present invention, each having 16 threads (16 shafts), 14 threads (14 shafts),
18 pieces (18 shafts), 20 pieces (20 shafts), 2
2 (22 shafts) and 24 (24 shafts) double weave papermaking fabrics; the numbers in the diagrams indicate the respective warp and weft numbers; in these examples, the dash Some even numbered wefts are polyester yarns and odd numbered wefts with dashes are polyamide yarns. Numbers without dashes are polyester warp threads. In FIGS. 1 to 6, the ○ marks indicate the positions where the warp threads weave the weft threads on the running surface, and the X marks show the positions where the warp threads weave the weft threads on the paper-making surface. In each figure, there are two Q marks i! This indicates that two adjacent warp threads interweave one weft thread on the running surface.Here, two consecutive ○ marks and two O marks on the left and right corners The distance between the marks indicates the length of the crimp of the weft threads forming the running surface of the papermaking fabric. As is clear from these figures, every other weft crimp is long, and the crimps with long crimp lengths
It is clearly stated that they are the same. The one in Figure 1 has 16 warps and 16 wefts, similar to the conventional one in Figure 16, and the length of the weft crimp is clearly longer than the one in Figure 16. . That is, for example, weft 1 (polyester yarn) in FIG. 16 forms a crimp with warp 7 and warp 15, and weft 2 (polyester yarn) forms a crimp with warp 2 and warp 1o, and each 7 between both crimps
There is a real warp thread, but the weft thread 1' (polyester thread) in Figure 1 forms a crimp with warp threads 7 and 8 and warp threads 15 and 16, and there are six warp threads between the two crimps. ,
The weft threads 2' form a crimp with the warp threads 10.11, and there are 14 warp threads between them and the next crimp in the complete X view (not shown) repeating to the right or left. Figures 7 and 8 show the knuckle portion of the papermaking fabric. Reference numerals 25 to 27 are warp threads, and 28 is a weft thread protruding from the running surface. Figure 8 shows the warp passing under the weft and weaving the weft. It is clear that the shaded areas in FIGS. 7 and 8 do not exhibit wear resistance. That is, as the number of knuckles increases, the portion of the weft yarn that does not have a wear-resistant function increases, and the effective wear volume decreases. FIG. 9 shows the shape of the crimp. The warp threads 30 and 31 pass under the weft thread 29 to weave the weft thread, but as is not clear from this figure, the warp threads 30° and 31 push the weft thread 29 upward. Also, the warp threads 33 and 34 are the weft thread 2
Although it is receiving the repulsive force of 9, it is pushing down the weft. Also, the warp threads 32 push the wefts downward;
It is smaller than 3.34. The index of how the warp overcomes the repulsive force of the weft to push and bend the weft is called crimpability, and if the crimpability is good, thick wefts can be used. The longer the distance between the warp threads 30 and the warp threads 31, the longer the warp threads 32
, 33, 34. The greater the number of..., the better the crimp performance. In the present invention, since the lengths of the crimps of the weft yarns protruding from the running surface of the fabric are made different from each other, thick yarns can be arranged in the polyamide weft yarns with long crimps.
#The wear volume can be increased and the wear resistance can be improved. FIG. 10 shows the knuckle part of the papermaking fabric of the present invention, in which two adjacent warp threads between warp threads 36 and 39 push up the weft thread 35 with a strong force, which shows the crimpability of the mineral thread. This improves the fabric structure, stabilizes the fabric structure, and allows the use of thicker weft yarns, which improves the rigidity of m-pieces and dramatically improves their abrasion resistance. In addition, in the present invention, FIGS. 11, 12, and 1
As explained in the embodiments shown in Figures 3, 14, and 15, weft yarns with different lengths of crimps that protrude toward the running side of the fabric do not have to be placed next to each other, nor do they have to be placed in the same number. The embodiment shown in Fig. 11 is a 2:1 mixed-weave papermaking paper fabric with two long crimp polyamide wefts followed by one short crimp polyester weft.
′! It is 11J. In the embodiment of FIG. 117, the long crimp weft is warp 1
It is understood that the weft yarns of the short crimp are six warp yarns long. In Figure 11, the polyamide wefts are 1', 2', 4', 5', 7', 8', 10', 11'.
13'14'16'17'. Although not shown, it is also possible to obtain a predetermined abrasion resistance for a 2:1 papermaking fabric in which one long crimp polyamide weft is followed by two short crimp polyester wefts (18 shafts). I can do it. In the embodiment shown in FIG. 12, three long crimp polyamide wefts are arranged, followed by one short crimp polyester weft.
This is a 1:3 papermaking fabric with 16 shafts in this arrangement. In this example, the long crimp weft is equal to 14 warp threads,
It is understood that the weft threads of the short crimp are six warp threads long. In the embodiment shown in Fig. 13, one long crimp polyamide weft is placed, followed by three short crimp polyester wefts.
This is a #4 product for 3:1 mixed weave paper making with 16 shafs h. This embodiment also makes it possible to obtain a predetermined wear resistance. The embodiment shown in FIG. 14 is a 3:3 ratio of 20 shafts in which the ratio of long crimp wefts to short crimp wefts is 3:2.
This is a two-way papermaking fabric. In Figure 14, 1', 3
', 5', 6', 8'10'11'13'15'
16"18' and 20' are polyamide weft yarns with long crimps, and the others are polyester weft yarns with short crimps. The embodiment shown in FIG. 2= of 20 shafts with a ratio of 2:3
3 pairs @ paper fabric. In Figure 15, 2' 4
'7'9'12'14',17',19'
One is a polyamide weft with a long crimp, and the other is a polyester weft with a short crimp. In this way, in the present invention, the ratio of the long crimp polyamide weft protruding to the running side and the short crimp polyester weft is 3=1 to 1:3 (2:1, 3:2, 1
:1, 2:3, 1:2 included. ). The reason for setting the ratio of long crimp wefts and short crimp wefts of the weft yarns protruding to the running side to be 3:1 to 1:3 is because it is preferable in terms of balance between improving abrasion resistance and maintaining the posture of the fabric. . That is, long crimped weft yarns have a large effect on abrasion resistance. However, since the number of times the warp threads are woven is small, the effect of maintaining the posture of the fabric is small. On the other hand, short crimp wefts have a great effect on maintaining the posture of the fabric, but have low abrasion resistance.If the ratio of long crimp wefts to short crimp wefts is 3:1 or more, the posture of the fabric can be maintained. If the ratio of the 6th crimp becomes worse and less than 1:3, the abrasion resistance deteriorates, which is also undesirable, and there will be a step between the long crimp and the short crimp. A ratio of ~1:3 has the effect of reducing level differences and smoothing the running surface. If the lengths of the crimps of the weft yarns that protrude on the running side that form the wear-resistant surface are made the same length for both long crimps and short crimps, it is effective to maintain the posture of the papermaking fabric better, but this is not always the case. It is important to have a long crimp that provides wear resistance and a short crimp that maintains the posture, as it is important to have a long crimp that provides wear resistance and a short crimp that maintains the posture. In each of the above embodiments, polyamide yarn was used as the long crimp weft, but it goes without saying that polyester yarn may also be used. As described above, in the present invention, the effective abrasion-resistant volume on the running side of the papermaking fabric can be significantly increased compared to conventional fabrics, and the abrasion resistance can be dramatically improved. This will be concretely demonstrated in the next comparative test. Taking the papermaking fabric of the present invention shown in FIG. 1 as a representative example,
A comparison of the abrasion resistance of the conventional papermaking fabrics shown in the figure is shown. First, in calculating the volume of the weft crimp to compare the abrasion volume, the crimp was assumed to be cylindrical between the warp yarns. In reality, as will be explained later, there are parts unrelated to wear that exist above the bends of the weft and the warp, so in the conventional example, the wear volume becomes smaller. Since crimps are formed every other weft, we calculated the volume of crimps for two adjacent wefts.
Also for the comparative example, calculate for two adjacent wefts and compare them. Regarding papermaking fabrics formed with the same 16 warps and wefts shown in Figures 1 and 16, two adjacent wefts are
In the conventional example shown in Figure 6, seven warps are arranged between each warp forming the crimp, so 7x4=28
A crimp of the full length is formed. Therefore, the volume is 28x0.17x <0.22/2) π=0.18 since the warp diameter is 0.17oun and the weft diameter is 0.22+nn.
11al11'. Similarly, in the embodiment of the present invention shown in FIG. warp 14
Each crimp has the same length as the actual length, and two adjacent warp threads form a pair and are entwined with the weft thread, allowing the use of thicker weft threads. If the diameter is 0.25++++n and the diameter of the polyamide weft is 0.301 m, the volume of the crimp is: 12x0.17x <0.25/2) ”π+14x0
．． 17x (0,30/2) π=0.268 ++
It is un3. Therefore, the increase rate of wear volume is (0,2
68÷0.181-1) xloo =48.1 (%)
That is, according to a simple calculation, the wear volume is approximately 50% larger in the embodiment of the present invention. According to actual measurements, the crimp length of the running surface in the conventional example shown in FIG. 15 was 1.1105n, and in the embodiment of the present invention shown in FIG. 1, it was 2.28n+s+. The results of the comparative test are shown in Table 1 below. (Leaving space below) Table 1 Test method: Testing was carried out using an abrasion tester manufactured by Nippon Filcon (Utility Model Registration No. 1350124), using heavy calcium carbonate as a filler. Test results: As shown in Table 1, the time required for the upper weft to wear out and break (wire life) was approximately 1.6 times longer for the product of the present invention than for the conventional product. [Effect] As explained above, in the papermaking fabric of the present invention, on its running surface, the crimp of the polyamide weft, which has excellent abrasion resistance, is twice as long as the crimp of the polyester weft, forming a long crimp. This makes it possible to use thick polyamide wefts, which could not be used in the past, and since the polyester wefts, which have excellent rigidity, are woven into short crimps, the rigidity of the material is good, and the Since the two matching warp threads form a pair and bend the weft threads on the running surface with strong force, thicker weft threads can be used, which helps maintain the posture of the fabric, that is, prevents it from elongating during use. Abrasion resistance can be dramatically improved without adversely affecting paper-making performance such as furnace water resistance and wire mark resistance, and without impairing the rigidity of the fabric.

[Brief explanation of the drawing]

Figures 1, 2, 3, 4, 5 and 6 show examples of the present invention, with 16 warp threads and 16 weft threads (16 shaft I-), 14 threads, respectively. Book (14 shafts),
・18 pieces (18 shafts), 20 pieces (20 shafts),
It is a complete design drawing of a double-woven fabric for papermaking with a complete structure composed of 22 fibers (22 shafts) and 24 fibers (24 shafts). Figures 7 and 8 show the knuckle of the papermaking fabric;
FIG. 9 shows the shape of the crimp. FIG. 10 shows the knuckle portion of the papermaking fabric of the present invention. 11, 12, 13, 14, and 15 show examples of the present invention, in which FIG. 11 shows a 1:2 papermaking fabric with 18 shafts 1 to 1, and 12 The figure shows a 1,3 interwoven papermaking fabric with 16 shafts, Fig. 13 shows a 3:1 interwoven papermaking fabric with 16 shafts 1, Fig. 14 shows a 3:2 interwoven papermaking fabric with 20 shafts, and Fig. 15 shows a 3:2 interwoven papermaking fabric with 20 shafts. This is a complete design diagram of a 2:3 interwoven papermaking fabric with 20 shafts, and FIG. 16 is a complete design diagram of a conventional papermaking fabric with a complete structure consisting of 16 warps and 16 wefts (16 shafts). It is. 1～24,25,26,27,30,31゜36.37
, 38.39...Warp 1' to 24' 28.29.35...Weft Patent applicant Nippon Filcon Co., Ltd. Agent Hideo Watanabe Figure 2 Figure 3 10 If 12 13 14 15 +6 1
7 18 Figure 7 2? Figure 8 Figure 10 Figure 12 Figure 11 Figure 10 11 12 13 14 15 16 1'/
lδ Figure 13 Procedures No. 2 (Volunteer) Figure 16 Heisei 1; Relationships Applicant Address: 3-27-24 Ikejiri, Otsutaya-ku, Tokyo Name: Nippon Filcon Co., Ltd. Representative: Tetsuyoshi Kajino 4, Agent: 107 (Telephone: 582-72111) Address:
4-13-5-6 Akasaka, Minato-ku, Tokyo Contents of the amendment Submit a complete statement of correction as shown in the attached document. Description 1, Name of the invention Double woven fabric for paper making 2, Claim 1, nX2 (n is an integer of 7 or more) weft yarns are arranged in two upper and lower layers, and the weft yarns in the lower layer are made of polyester yarn. Polyamide yarn is arranged, and this lower layer weft is polyamide weft.
A double A material for papermaking with a complete structure in which the polyester weft is woven in two places by the two warp threads. 2. The polyamide weft is a yarn with a larger wire diameter than the polyester weft. The ratio of the polyamide weft to the polyester weft is 1:
3 to 3:1, 1-1t to 3 to 9
3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a papermaking fabric. BACKGROUND OF THE INVENTION There are more demands than ever for papermaking fabrics. Broadly speaking, they can be divided into (a) problems related to paper quality itself, such as preventing the occurrence of wire marks and sufficient entanglement of paper fibers, or problems with paper manufacturing yield, and (b) improving drag resistance and extending the service life of textiles. , (c) the problem of good P aqueous properties, etc. These problems are often related to each other, but roughly speaking, the problem of (b) is a problem that is largely related to the structure of the paper-making surface of the fabric. (b) is closely related to the structure of the running side surface of the fabric, and (c) is a problem regarding the fabric as a whole. These problems must be solved not only in multi-weave fabrics but also in multi-layer fabrics. Many proposals have been made for the conventional solution (a). However, the problem (b), that is, the 'fIi of papermaking fabric
Not enough efforts have been made to improve wear resistance.
The running side of the papermaking fabric is of the weft abrasion type, which is sufficient to prevent warp abrasion. However, in recent years, various conditions have been required such as increasing paper manufacturing speed, increasing the amount of filler used, and increasing the need to manufacture neutral paper, and the abrasion resistance of paper manufacturing fabrics has become a major problem. In order to improve such abrasion resistance, attempts have been made to use abrasion-resistant polyamide as the weft on the running surface of conventional papermaking fabrics with one weft wear type. The disadvantage of woven fabrics is that they stretch easily and have poor posture stability. Therefore, conventionally, attempts have been made to use polyester with excellent rigidity for both the warp and weft to construct paper-making fabrics that are difficult to stretch and have excellent posture properties. FIG. 16 is a complete design drawing showing a conventionally used double weave papermaking fabric having 16 warp and weft yarns each made of polyester. In the figure, the O mark indicates the position where the warp threads weave the weft threads on the running surface, and the X mark indicates the position where the warp threads weave the weft threads on the paper-making surface. Therefore, the distance between O marks and O marks indicates the crimp length of the weft yarns on the running surface.In the conventional papermaking fabric shown in FIG. 16, the crimp lengths of adjacent weft yarns on the running surface are the same. However, in order to meet the above-mentioned requirements, in conventional papermaking fabrics, attempts have been made to use threads with a large diameter for the weft on the running side of papermaking fabrics, which has improved wear resistance. Although this can be improved to some extent, the thick weft yarns disrupt the balance between the weft and warp yarns, resulting in poor crimp performance and wire marks. Furthermore, as understood from Zhao in (c) above, if the structure of the running surface changes, the water quality of the reactor will also be affected, and the problem cannot be solved by palliative means such as simply making the weft thicker. [Problems to be Solved by the Invention] In view of the problems of the conventional technology as described above, the present invention solves the problem without adversely affecting the performance of paper making such as P water resistance and wire mark property of papermaking fabric. This is intended to improve wear resistance. [Means for solving the problems] The present invention has the following features: r1. nX2 pieces (n is an integer of 7 or more)
The wefts are arranged in two layers, upper and lower, respectively, and the lower layer wefts are polyester yarns and polyamide yarns, and the lower layer wefts are woven by two warps, with the polyamide weft in one place and the polyester weft in two places. A double-woven fabric for papermaking with a completely textured texture. 2. The double-woven fabric for papermaking according to claim 1, wherein the polyamide weft has a larger wire diameter than the polyester weft. 3. The ratio of polyamide weft to polyester weft is 1:3
3:1 to 3:1. Effect] The abrasion resistance of the running surface of the papermaking fabric is increased by increasing the abrasion volume of the weft yarns forming the running surface. From the viewpoint of stability of the posture of the fabric during use and extension of its service life, it is desirable that the weft yarns have an abrasion-resistant effect.This is because when the warp yarns wear out, the fabric dimensions change or breakage occurs. The papermaking fabric of the present invention in which the weft yarns are arranged in a double layer, upper and lower, has excellent abrasion resistance due to the arrangement of polyester weft yarns with excellent rigidity and polyamide weft yarns with excellent abrasion resistance on the running surface. The crimp of polyamide weft yarns can be lengthened. Furthermore, by weaving the polyester weft and polyamide weft of the running surface into pairs between two adjacent warp threads, the weft threads can be bent with strong force, making it possible to use thicker weft threads. As a result, the surface properties of conventional papermaking fabrics, that is, the support properties of valve fibers,
By forming long crimps in the weft yarns on the running surface without changing the wire mark characteristics, the abrasion volume is increased and the abrasion resistance of papermaking fabrics is greatly improved. In fact, at the knuckle where the warp and weft intersect and the yarn is sharply bent, there is a weft portion that does not have an anti-wear effect due to the shape of the crimp. In other words, within the same area, the smaller the number of knuckles, the better the P water resistance from the viewpoint of wear resistance. In addition, crimpability is an indicator of the ability of the warp to overcome the repulsive force of the weft and bend the weft when the warp tries to bend the weft. The longer the distance, the better. When crimpability improves, thicker wefts can be used. In the present invention, the crimp of the polyamide weft on the running surface of the fabric is long, so the crimpability is good.
Thick weft yarns that could not be used in the past can be placed, reducing wear [
can be made even larger. Furthermore, in the present invention, two adjacent warp yarns form a pair and bend the weft yarn on the running surface with strong force, resulting in even better crimpability and the ability to use thicker weft yarns.
Wear resistance is dramatically improved. Incidentally, the increase in wear volume and the increase in wear resistance will be specifically explained in the following example section while comparing with a conventional example. [Example] In Figures 1 to 6, the warp and weft of the present invention are 16 (16 shafts), 14 (14 shafts),
18 pieces (18 shafts), 20 pieces (20 shafts), 2
It is a complete design diagram showing a double weave papermaking fabric with 2 (22 shafts) and 24 (24 shafts), and the numbers in the diagram indicate the respective numbers of the warp and weft. In the example, the weft is a dash. A number with a dash indicates a polyester thread or a polyamide thread, and a number without a dash indicates a polyester warp thread. In Figures 1 to 6, the Q mark indicates the position where the warp interweaves the weft on the running surface, and the X mark indicates the position where the warp interweaves the weft on the papermaking surface. In each figure, There are two consecutive ○ marks, which indicates that two adjacent warp threads are weaving one weft thread on the running surface.Here, two consecutive ○ marks and adjacent left and right 2g The distance between consecutive O marks indicates the length of the crimp of the weft yarn forming the running surface of the papermaking fabric. As is clear from these figures, the crimps of every other weft yarn are long, and the crimps with long crimps are connected to each other.
It is clearly stated that they are the same. The one in FIG. 1 has 16 warp threads and 16 weft threads, respectively, like the conventional one in FIG. 16, and the length of the crimp of the weft threads is clearly longer than the one in FIG. 16. That is, for example, weft 1' (polyester yarn) in Fig. 16 forms a crimp with warp 7 and warp 15, and weft 2' (polyamide yarn) forms a crimp with warp 2 and warp 10.
There are seven warp yarns between each crimp, but the weft 1' (polyester yarn) in Figure 1 forms a crimp with warp yarns 7 and 8 and warp yarns 15 and 16. There are 6 warp threads between both crimps, weft thread 2' (polyamide thread) forms a crimp with warp thread 10.11 and repeats on the right or left side (not shown). There are 14 warp threads between the next kling. Figures 7 and 8 show the knuckle portion of the papermaking fabric. 25 to 27 are warp yarns, and 28' is a weft yarn protruding from the running surface. In Figure 7, the warp 26 is the weft 28'.
Figure 8 shows the warp thread 26 passing over the weft thread 28' and not weaving the weft thread 28'. It is clear that the parts do not exhibit strong corrosion resistance. That is, as the number of knuckles increases, the portion of the weft yarn that does not have a wear-resistant function increases, and the effective wear volume decreases. FIG. 9 shows the shape of the Kling. The warp threads 30 and 31 pass under the weft thread 29' and weave the weft thread 29', but as is clear from this figure, the warp threads 30, 31 push the weft thread 29' upwardly. In addition, weft threads 33 and 34
The repulsive force of the weft thread 29' is being applied, but the weft thread 29' is being pushed down. Also, although the warp threads 32 push the weft threads 29' downward, their effect is smaller than that of the warp threads 33 and 34. The index of how the warp overcomes the repulsive force of the weft and pushes and bends the weft is called crimpability, and if the crimpability is good, thick wefts can be used. The longer the distance between the warp 3o and the warp 31, the longer the distance between the warp 3o and the warp 31, and the warp 32
, 33, 34. The greater the number of..., the better the crimp performance. In the present invention, since the lengths of the crimps of the weft yarns that protrude from the running surface of the fabric are made different from each other, thick yarns can be arranged in the polyamide weft yarns with long crimps, so that the wear-resistant volume can be increased. This makes it possible to improve abrasion resistance. FIG. 10 shows the knuckle of the papermaking fabric of the present invention, in which two adjacent warps 37 and 38 push up #R yarn 35' between warps 36 and 39 with strong force. The crimpability of the weft yarns is improved, the fabric structure is stabilized, and thicker weft yarns can be used, which improves the properties of the fabric and dramatically improves its abrasion resistance. In addition, in the present invention, FIGS. 11, 12, and 1
As explained in the embodiments shown in Figures 3, 14, and 15, the weft threads of different lengths of clings protruding toward the running side of the fabric do not have to be arranged next to each other, nor do they have to be arranged in the same number. The embodiment shown in FIG. 11 is an 18-shaft 1:2 papermaking fabric having two long crimp polyamide wefts followed by one short crimp polyester weft. In the embodiment of FIG. 11, the long crimp weft is warp 16.
It is understood that the weft threads of the short crimp are the length of seven warp threads. In Figure 11, the polyamide weft is 1
', 2', 4', 5'7'8'10',
11',13',14',16' and 17'. Although not shown in the drawings, a predetermined abrasion resistance can be obtained from an 18-shaft 2:1 mixed-weave papermaking workpiece in which one long crimp polyamide weft is followed by two short crimp polyester wefts. . In the embodiment shown in FIG. 12, three long crimp polyamide wefts are arranged, followed by one short crimp polyester weft.
This is a 1:3 mixed woven papermaking grade material with 16 shafts in this arrangement. In this example, the long crimp weft is equal to 14 warp threads,
It is understood that the weft threads of the short crimp are six warp threads long. In the embodiment shown in Fig. 13, one long crimp polyamide weft is arranged, followed by three short crimp polyester wefts.
Of the 16 shafts arranged, 3rd and 1st rows are paper-making fabrics. This embodiment also makes it possible to obtain a predetermined wear resistance. The example of FIG. 14 is a 2=20 shaft with a ratio of long crimp wefts to short crimp wefts of 2:3.
This is a triple weave papermaking fabric. In Figure 14, 1', 3
', 5', 6', 8'10'11',13', 15
', 16', 18', and 20' are polyamide weft yarns with long crimps, and Ike is a polyester weft yarn with short crimps. The embodiment shown in FIG. 15 is a 3:3 ratio of 20 shafts in which the ratio of long crimp wefts to short crimp wefts is 2:3.
This is a two-way papermaking fabric. In Figure 15, 2', 4
', 7', 9', 12', 14', 17', and 19' are polyamide weft yarns with long 'crimps,' and Ike is polyester weft yarns with short crimps. In this way, in the present invention, the ratio of the long crimp polyamide weft protruding to the running side and the short crimp polyester weft is 3:1 to 1:3 (2:1, 3:2.1
:1, 2:3, 1:2 included. ). The reason for setting the ratio of long crimp wefts and short crimp wefts of the weft yarns protruding to the traveling side to be 3=1 to 1:3 is because it is preferable in terms of balance between improving abrasion resistance and maintaining the posture of the fabric. . That is, long crimped weft yarns have a large effect on abrasion resistance. However, since the number of times the warp is woven is small, the effect of maintaining the posture of the fabric is small.On the other hand, short crimp weft yarns have a large effect of maintaining the posture of the fabric, but have low abrasion resistance. If the ratio of the long crimp weft yarn to the short crimp weft yarn is 3:1 or more in terms of the long crimp yarn, the posture of the woven fabric will be difficult to maintain, which is undesirable, and if the ratio of the two is less than 1:3, the abrasion resistance will deteriorate. This is also undesirable as the crimp becomes worse, and a level difference occurs between the long crimp and the short crimp, but when the ratio is set to 3:1 to 1:3, the level difference is reduced and the running surface becomes smooth. 19 If the lengths of the crimp of the weft yarns that protrude to the running side that form the milling surface are made the same length between long crimps and between short talimps, it is effective to maintain the posture of the paper-making material better. It is important to have a long crimp that provides wear resistance and a short crimp that maintains the posture, as it is not necessary to make them the same length for the wear resistance to be achieved. In each of the above embodiments, polyamide yarn was used as the long crimp weft, but it goes without saying that polyester yarn may also be used. As described above, in the present invention, the effective abrasion-resistant volume on the running side of the papermaking fabric can be significantly increased compared to conventional fabrics, and the abrasion resistance can be dramatically improved. This will be concretely demonstrated in the next comparative test. Taking the papermaking fabric of the present invention shown in FIG. 1 as a representative example,
A comparison of the abrasion resistance of the conventional papermaking fabrics shown in the figure is shown. First, in calculating the volume of the weft crimp to compare the abrasion volume, the crimp was assumed to be cylindrical between the warp yarns. In reality, as will be explained later, there are parts unrelated to the narrowing that exist above the bends of the weft and the warp, so in the conventional example, the winding volume is smaller. 6 In the present invention, the long crimp and the normal length Since the crimps are formed on every other weft, the crimp # and the product were calculated for two adjacent wefts, and in the comparative example, they were also calculated for two adjacent wefts and the two were compared. Regarding the paper manufacturing 81i product formed by the same 16 warps and wefts shown in FIGS. 1 and 16, the two adjacent wefts are the same as the warp and warp forming the crimp in the conventional example shown in FIG. There are 7 warp threads in between, so 7X4=
A crimp with a length of 28 strands is formed. Therefore, assuming that the warp diameter is 0.17+n+n and the weft diameter is 0.22m+n, its volume is 28x0.17x (0,22/2) 2z=o, 18
1 mm". Similarly, in the embodiment of the present invention shown in FIG. 14 warps for one weft
Each crimp has the same length as the actual length, and it is possible to use thick weft threads in which two adjacent warp threads are paired and entwined with the weft threads, so the diameter of the warp threads is 0.17n++n, and the line diameter of the polyester weft threads is 0.17n++n. If the diameter is 0.251 m and the diameter of the polyamide weft is 0.30 nm, the volume of the crimp is: 12x0.17x <0.25/2) 2π -? -14
・, 0.17:<(0,30/2) yr =0.2
It is 6811m3. Therefore, the increase rate of wear volume is (
0,268÷0.181-1) x 100 =48.1
(%) That is, by simple calculation, the wear volume is approximately 0% large in the embodiment of the present invention. The length of the crimp on the running surface in the conventional example shown in FIG. 15 was actually measured to be 1.105++n+, and in the embodiment of the present invention shown in FIG. 1, it was 2.28 mm. The results of the comparative test are shown in Table 1 below. (The following is a blank space) Table 1 Test method: Testing was conducted using a drag tester manufactured by Nippon Filcon (Utility Model Registration No. 1350124), using heavy calcium carbonate as a filler. Test results: As shown in Table 1, the time required for the lower weft to wear out (wire life) was approximately 1.6 times longer for the product of the present invention than for the conventional product. [Effects] As explained above, on the running surface of the papermaking fabric of the present invention, the crimp of the polyamide weft, which has excellent abrasion resistance, is twice as long as the crimp of the polyester weft, forming a long crimp. This allows for the use of thick polyamide wefts, which could not be used in the past, and since the highly rigid polyester wefts are folded into short crimps, the fabric has good rigidity.
Since two adjacent warp yarns form a pair and bend the weft yarn on the running surface with strong force, it is possible to use even thicker weft yarns, which helps maintain the posture of the textile (preventing elongation during receiving, The abrasion resistance can be dramatically improved without adversely affecting the paper-making performance such as water resistance and wire mark resistance, and without impairing the rigidity of the fabric.

[Brief explanation of the drawing]

1, 2, 3, 4, 5, and 6 show examples of the present invention, in which the number of warp threads and weft threads are 16 (16 shafts) and 14, respectively. (14 shafts), 1
8 pieces (18 shafts), 20 pieces (20 shafts), 22 pieces
This is a complete design drawing of a fully textured papermaking double fabric consisting of books (22 shafts) and 24 books (24 shafts l-1). Figures 7 and 8 show the knuckle part of the papermaking fabric; Figure 9 shows the shape of the crimp, Figure 10 shows the knuckle part of the papermaking fabric of the present invention, Figures 11, 12, 1
3, 14, and 15 show examples of the present invention, in which FIG. 11 shows an 18-shaft 1:2 cross-woven papermaking fabric, and FIG. 12 shows a 16-shaft 1=3 cross-woven papermaking fabric. Fabric, Figure 13 shows a 3:1 papermaking fabric with 16 shafts,
Fig. 14 shows a complete design drawing of a 20-shaft 2:3 cross-woven papermaking fabric, Fig. 15 shows a complete design drawing of a 20-shaft 3 = 2 cross-woven papermaking fabric, and Fig. 16 shows the warp and weft of a conventional example. A duplex for papermaking made of completely #fl fiber, each consisting of 16 pieces (16 shafts)! ? This is a complete design drawing of the i-product. 1~27.30~34.36~39...warp 1'
~24'28'29'35'...Weft Fig. 1 Fig. 2 Fig. 3 Fig. 7 Fig. 8 Fig. 10 and 3/ Fig. 12 Fig. 11 10 11 12 13 14 15 15 17
ill Figure 13

Claims (1)

[Claims] 1. n x 2 (n is an integer of 7 or more) weft yarns are arranged in two layers, upper and lower, respectively, and the lower layer wefts are polyester yarns and polyamide yarns, and the lower layer wefts are polyamide wefts. A double-woven fabric for papermaking that has a complete structure in which the polyester weft is woven in one place and the polyester weft is in two places, and two warp yarns are adjacent to each other. 2. The double-woven fabric for papermaking according to claim 1, wherein the polyamide weft has a larger wire diameter than the polyester weft. 3. The ratio of polyamide weft to polyester weft is 1:3
~3:1 in claim 1, 2 or 3
Double woven fabric for paper making as described in Section 1.