JPH0274691A - Doubly woven fabric for paper making - Google Patents

Abstract

PURPOSE:To obtain the subject woven fabric free from a bad influence upon water leaking properties and wire mark properties and excellent in hardwearing properties by arranging polyester yarns and polyamide yarns as wefts on the traveling surface of a woven fabric. CONSTITUTION:(A) Polyester yarns excellent in stiffness and (B) polyamide yarns excellent in hardwearing resistance are used as nX2 (n is >=7) wefts and respectively doubly arranged up-and-down. The lower layer is so interwoven that the component (A) and (B) may be interwoven respectively one time and two times by warps, thus obtaining the objective woven fabric.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to papermaking fabrics.

[Conventional technology]

There are more demands than ever for R-products for paper manufacturing. Broadly speaking, they can be divided into (a) prevention of wire marks, sufficient entanglement of paper fibers, problems related to paper quality itself or paper manufacturing yield, (b) improvement of abrasion resistance, extension of the service life of III products, (c) Problems with good water heating properties, etc. Each problem is related to each other in many ways, but roughly speaking, problem (a) is mainly related to the structure of the paper-making surface of the fabric, and problem (b) is a problem that is largely related to the structure of the running side surface of the fabric. Closely related, (c) is a problem regarding l-quantity bodies.

Such problems occur not only with multi-woven fabrics, but also with multi-woven fabrics.
This is a problem that must be solved in the same way when it comes to things.

Many proposals have been made for the conventional solution (a). However, sufficient efforts have not been made to improve the abrasion resistance of papermaking fabrics, and the running side of papermaking fabrics is of the weft abrasion type, which is limited to preventing warp abrasion. There is.

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 materials has become a major issue. .

In order to improve the abrasion resistance, attempts have been made to use abrasion-resistant polyamide as the weft on the running surface of papermaking fabrics of conventional weft abrasion type; The shortcomings of this type of clothing were that it was easy to stretch and had poor posture.

Therefore, conventionally, polyester having excellent rigidity has been used for both warp and weft to construct paper-making fabrics that are difficult to stretch and have excellent posture.

FIG. 15f 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 interweaves the weft on the running surface, and the X mark indicates the position where the warp interweaves the weft on the paper-making surface. Therefore, the distance between the O mark and the O mark indicates the length of the weft yarn paste Jump on the running surface. In the conventional papermaking fabric shown in FIG. 15, 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 thicker diameter for the wefts on the running side of papermaking and Ill materials, which has resulted in poor durability. Although the abrasion resistance can be improved to some extent, the thick weft threads disrupt the balance between the weft and warp threads, resulting in poor crimp performance and wire marks.

Furthermore, as can be understood from the problem (c) above, if the structure of the running surface changes, the water temperature will also be affected, and the problem cannot be solved by a palliative measure such as making the weft thicker in JjL.

[Problem to be solved by the invention]

In view of the above-mentioned problems of the conventional technology, the present invention attempts to improve the abrasion resistance of papermaking materials without adversely affecting papermaking performance such as P water resistance and wire mark resistance. It is something.

[Means to solve the problem]

The present invention arranges a polyester system with excellent rigidity and a polyamide system with excellent abrasion resistance in the weft yarns of the abrasion-resistant running surface of a papermaking fabric, and crimps the polyamide wefts that protrude from the running surface. To provide a papermaking fabric whose length is increased and whose abrasion resistance is dramatically improved without affecting the papermaking surface for making 8A paper.

Since the present invention forms the above-mentioned structure on the running surface of the paper-making fabric, the effect on the paper-making surface is extremely small, has almost no effect on the paper-making properties of the paper-making surface, and improves P water resistance and wire mark resistance. No change is seen.

In the present invention, since the crimp of the polyamide weft protruding toward the running side is long, thick wefts can be arranged, and wear resistance can be dramatically improved.

[For production]

The abrasion resistance of the running surface of a paper manufacturing product 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 useful life, it is desirable to have the weft have a wear-resistant effect.
This is because when the warp threads wear out, the dimensional change or breakage of the fabric occurs.

The paper manufacturing A article of the present invention in which the weft yarns are arranged in a double layer, upper and lower, is made of polyester weft yarns with excellent rigidity on the running surface and wear-resistant U.
By arranging the weft yarns made of polyamide, which has excellent wear resistance, and the weft yarns, for example, alternately, the crimp of the polyamide weft yarns, which have excellent abrasion resistance, can be lengthened. As a result, polyamide with excellent wear resistance increases the wear volume by forming long crimps on the wefts of the running surface without changing the surface properties of conventional papermaking fabrics, that is, pulp fiber support properties and wire mark characteristics. The use of yarn greatly improves the abrasion resistance of papermaking fabrics.

In reality, in the knuckle section where the warp and weft intersect and the yarn is sharply bent, there is a weft section that does not provide an anti-wear effect due to the crimp shape. However, in terms of wear resistance, the effective wear volume is even larger, and hot water resistance is also improved.

Also, is crimpability, an indicator of the warp's ability to push and bend the weft by overcoming the repulsive force of the weft when the warp tries to bend the weft? The longer the distance, the better. If 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 in the past, can be used, the wear volume can be further increased.

Incidentally, the increase in wear volume will be specifically explained in the following example section while comparing it with a conventional example.

〔Example〕

In Figures 1 to 6, the warp and weft of the present invention are 16 (16 shuffles), 14 (1...1 shuffle), 18 (18 shuffles), 20 (20 This is a complete design diagram showing a double-woven papermaking fabric i snout, which has 1 shaft (22 shafts 1~), 22 shafts (22 shafts 1~), and 1 2t (24 shafts), and the numbers without dashes in the diagram indicate warp threads, In these examples, the odd numbered weft threads are polyester-based and the even numbered weft threads are polyamide yarns.

In FIGS. 1 to 6, the O mark does not indicate the position where the warp interweaves the weft on the running surface. Therefore, for a short crimp, the distance between the Q mark and the O mark on each diagram, and for a long crimp, the distance between the Q mark on the complete design diagram in each diagram and the O mark on the adjacent complete design diagram (not shown). The distance M between them indicates the length of the crimp of the weft threads forming the running surface of the papermaking fabric.

As is clear from these figures, the crimps of the weft threads are long, and the crimps are long.
It even clearly states that they are the same.

The one in Figure 1 is the same as the conventional one in Figure 15, with 16 warps and 16 wefts each, and the length of the weft crimp is clearly longer than the one in Figure 15. . That is, for example, weft 1 (polyester yarn) in FIG. 15 forms a crimp with warp 4 and warp 13, and weft 2 (polyester) forms a crimp with warp 8 and warp 16. 7 for each crimp opening
If there is a book weft, the weft 1 (polyester yarn) in Fig. 1 forms a crimp with the warp 5, and the weft 2 (polyamide yarn) forms a crimp with the warp 16, respectively, and repeats on the right or left side; a master figure ( 1 between the next crimp (not shown)
There are five warp threads.

In what is shown in FIGS. 2 to 6, it is clear that 1) the length of the cling is increased compared to the conventional one (not shown).

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 anti-wear 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 two weft threads and weave the weft threads together, but as is clear from this figure, the warp threads 30 and 31 push the two weft threads 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. This index in which the warp overcomes the repulsive force of the weft and pushes and bends the weft is called crimpability.
If the crimpability is good, thicker wefts can be used.

The longer the distance between the warp threads 30 and the warp threads 31, 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 toward the running side 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 of the palm can be increased. It is possible to improve wear resistance.

In addition, in the present invention, FIGS. 10, 11, and 1
As explained in the embodiments of FIGS. 2, 13, and 14, the weft yarns with different talimp lengths protruding toward the running side of the fabric do not need to be arranged next to each other, or they can be arranged in the same number fff
I don't have to do it. The example in the 'SIO diagram is 1 = 1 of 18 shafts with two long crimp polyamide wefts followed by one short crimp polyester weft.
2-cross "# A product for paper making. In the example of FIG. 10,
It is understood that the long crimp weft is 17 warp threads long and the short crimp weft is 8 warp threads long.

In Figure 10, the polyamide wefts are 2', 3'5' 6
', 8', 9', 11', 12', 1415', 17'
, 18'.

In addition, although it is not shown in the figure, a 18-shaft 1 to 2=1 mixed weaving papermaking article in which one long crimp polyamide weft is placed followed by two short crimp polyester wefts also achieves the specified abrasion resistance. I can do it.

The embodiment shown in Fig. 11 is a 11i for paper making with 1:3 mixed weave of 1 to 16 shards, in which three long crimp polyamide wefts are arranged, followed by one pheasant crimped polyester weft.
There are 11 things. It is understood that in this example the long crimp wefts are 15 warps long and the short crimp wefts are 7 warps long.

The embodiment shown in Fig. 12 is a 3:1 mixed weaving material for paper making with 16 shafs 1 to 3, in which one long crimp polyamide weft is arranged, followed by three short crimp polyester wefts, and this is also a 3:1 mixed weaving product with a specified length. wear resistance can be obtained.

The example of FIG. 13 is 3 of 20 shafts where the ratio of long crimp wefts to short crimp wefts is 3=2:
This is a two-way papermaking fabric. In the figure, weft yarns 1' and 3'
, 5', 6', 8'1(]'11'13', 1
5', 16', 18', and 20' are long crimped polyamide yarns, and the others are short crimped polyester yarns.

The embodiment shown in FIG. 14 is a 20-shaft t.
= 3-weave papermaking fabric. In the figure, weft yarns 2', 4
', 7', 9', 12', 14', 17' and 19' are long crimped polyamide yarns, and the weft is a short crimped polyester yarn.

In this way, in the present invention, the ratio of the long crimp polyamide weft protruding to the running side and the short crimp lj ester weft is 3:1 to 1:3 (2:1, 3:2
, 1:1:2:3, 1:2. ).

It is preferable to make the wefts that protrude toward the running side in a ratio of 3:1 to 1:3 between long crimp wefts and short crimp wefts because it is preferable for the balance between improving wear resistance and maintaining the posture of the object. be. 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 vI4 object is small, while the short crimp weft yarn has a large effect of maintaining the posture of the m object, but its abrasion resistance is low. If the ratio of the long crimp to the short crimp is 3:1 or more in terms of the long crimp, it will make it difficult to maintain the posture of the fabric, which is undesirable, and if the ratio of both is less than 1:3, the abrasion resistance will deteriorate, which is also undesirable. There is a difference in level between the long crimp and the short crimp, but when the ratio is 3=1 to 1:3, the difference in level is reduced and the crimp becomes smooth.

If the lengths of the crimps of the weft threads protruding to the running side that form the wear-resistant surface are set to the same length for long crimps and short crimps, then for papermaking, l1M! I-1! This has the effect of improving the maintenance of the posture of I, but it does not necessarily mean that wear resistance will not be achieved unless the lengths are the same. It is important to have a long crimp that provides wear resistance and a short crimp that maintains posture.

However, in the case of a single-ply papermaking fabric, it is desirable to make the long crimp wefts and the short crimp wefts the same length so as not to affect the papermaking surface.

As described above, in the present invention, the effective abrasion-resistant volume of the paper-making pIA material on the running side can be significantly increased compared to conventional fabrics, and the abrasion resistance can be dramatically improved. This will next be demonstrated in a 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 volume of wear becomes small.

In the present invention, the long crimp and the normal length crimp are combined into one
Since the crimp wear volume was calculated for two adjacent weft yarns since the crimp was formed in a regular manner, the wear volume of the crimp was also calculated for two adjacent weft yarns in the comparative example and the two were compared.

Regarding papermaking fabrics formed with the same 16 warps and wefts shown in Figures 1 and 15, the wefts of two adjacent trees are
In the conventional example shown in Figure 5, seven warps are arranged between each warp that forms the cling, so 7X4=28
A crimp with the length of the main thread is formed 6 Therefore, its volume is 0.17 mm, which is the diameter of the warp thread, and 0.17 mm, which is the diameter of the weft thread.
Since 22+++e+, 28x 0.17x (0,22/2)2 π= 0
．． 181 City 3.

Similarly, in the embodiment of the present invention shown in Fig. 1, a crimp with a length of 15 warp threads is formed for one weft thread, and the longer the crimp, the better the clinging properties, and the larger the diameter of the weft thread. Since it can be used, the wire diameter of polyester warp is 0.
．． 17++on, the diameter of the short crimped polyester weft is 0.22nm, and the diameter of the long crimped polyamide weft is 0.25m+n, then the volume of the crimp is 14x 0.17x (0,22/2)2π+15x0
．． 17x(0,25/2)2π-0,216++n+3
It is. Therefore, the increase rate of wear volume is (0,216÷
0.181-1)
Large wear volume.

According to actual measurements, the crimp length of the running surface in the conventional example shown in FIG. 15 was 1.1105 ra, and in the embodiment of the present invention shown in FIG. 1, it was 2.28 ra.

The results of the comparative test are shown in Table 1 below.

Table 1 Test Methods Tests were conducted using a Nippon Filcon wear tester (Utility Model Registration No. 1350124) and heavy calcium carbonate as a filler.

Test results: As shown in Table 1, the time required for the upper weft to wear out (wire life) was approximately 1.5 times longer for the product of the present invention than for the conventional product.

〔effect〕

As explained above, in the paper manufacturing product 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 on its running surface, forming a long crimp, and the crimp property is good. As a result, thick polyamide weft yarns that could not be used in the past can be used, and the highly rigid polyester weft yarns are woven into short crimps, resulting in good rigidity of the fabric.
4.Maintaining the posture of the product, that is, preventing it from stretching during use,
The abrasion resistance of the fabric can be dramatically improved without adversely affecting paper-making properties 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
It is a complete design drawing of a double-woven fabric for paper making with a complete structure consisting of books (22 shafts) and 24 fibers (24 shafts). Figures 7 and 8 show the knuckle part of the papermaking fabric;
The figure shows the shape of the crimp. Figure 10, Figure 11, Figure 1
Figures 2, 13, and 14 show examples of the present invention, in which Figure 10 shows an 18-shaft 1:2 mixed-weave fabric, and Figure 11 shows a 16-shaft 1:3 paper-making fabric. Fabric, Figure 12 shows a 3:1 papermaking fabric with 16 shafts,
Fig. 13 is a complete design drawing of a 20-shaft 3=2 interlaced woven fabric, and Fig. 14 is a complete design drawing of a 20-shafted 2:3 interwoven papermaking fabric, and Fig. 15 shows a conventional example in which the warp and weft are each different. 1
This is a complete design drawing of a paper-making fabric with a complete structure consisting of 6 yarns (16 shuffles). 1-24, 25, 26, 27, 30.31... warp,
1゛～24-. 28.29...Weft 6 Figure 2 Figure 1 Figure 3 Figure 4 Figure 7 λ? Figure 8 Figure 9 Figure 10 Figure 10 11 12 13 14 15 16 17
ill No. 11 Artwork 4 Fig. 12 Fig. 14 Fig. 13 Fig. 10 11 12 1:l 14 1ri lb
11 Ill i juFigure 15

Claims (1)

[Claims] 1n×2 (n is an integer of 7 or more) wefts are arranged in a double layer, upper and lower, and the lower layer wefts are polyester yarns and polyamide yarns, and the lower layer wefts are polyamide yarns. Thread once,
The polyester yarn is a double-woven fabric for papermaking with a complete structure woven by two warps. 2. The double-woven fabric for papermaking according to claim 1, wherein the polyamide weft is a yarn having a thicker linear line than the polyester weft. 3 The ratio of polyamide weft to polyester weft is 1:3
The double-woven fabric for papermaking according to claim 1 or 2, wherein the ratio is 3:1.