JPH02277847A - Extensible thermally shrinkable polyamide monofilament for endless woven fabric and endless woven fabric - Google Patents

Abstract

PURPOSE:To obtain woven fabric for paper making having excellent wear resistance, water filtering properties, wire marking properties, etc., by specifying elasticity characteristics of extensible thermally shrinkable polyamide monofilament with load and heat. CONSTITUTION:Extensible thermally shrinkable polyamide monofilament for woven fabric for paper making, having >=6% elongation with change of load from 1.25g/d to 1.75g/d and >=7% heat shrinkage factor in boiling water is set at least as weft. The extensible thermally shrinkable polyamide monofilament is obtained by adjusting elongation degree, relaxing degree and treating temperature of monofilament.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to extensible heat-shrinkable polyamide monofilaments for endless textiles, and abrasion-resistant lI# end-shaped fibrous textile abrasion-resistant paper-making in which this filament is arranged. Regarding textiles for use.

[Prior Art] There are many conventionally used endless objects, such as conveyor belts, dewatering belts, belts, power transmission belts, papermaking dry campuses, papermaking felts, and papermaking fabrics. . All of these endless woven fabrics are subjected to strong tension in the warp direction during use, so they stretch in the warp direction and contract in the weft direction, which means that the length increases and the width contracts.Also, due to loads in the vertical direction, the length increases and the width decreases. Since it shrinks, it has a problem of poor posture stability. Furthermore, there is the problem that it must have high abrasion resistance because it comes in contact with drive rolls, control rolls, etc. during running, and the running surface must be smooth for smooth running. The top surface needs to be flat in order to place things on it. Although such problems are common to endless textiles, they have not yet been satisfactorily solved.The present invention solves these problems.

Among endless textiles, paper-making textiles are most demanding of these properties. In addition to the above-mentioned performance, paper-making fabrics are required to have various performances unique to papermaking, which will be described later. However, if we explain the common problems mentioned above for paper-making fabrics, we will be able to explain almost all the common problems and their solutions for endless fabrics. For ease of understanding, the present invention will be explained below using a papermaking fabric as a representative.

In addition to the above-mentioned problems, there are many more demands on papermaking fabrics than ever before. Broadly speaking, they can be divided into (a) problems related to paper quality itself, such as prevention of wire marks and sufficient entanglement of paper fibers, or problems with paper manufacturing yield; (b) improvement of abrasion resistance, extension of the usable life of textiles; (c) The problem of good P water resistance, etc. Each problem is related to each other in many ways, but roughly speaking, the problem of (b) is mainly a problem that is largely related to the top layer 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.

Many proposals have been made for the conventional solution (a). However, sufficient efforts have not been made to improve the abrasion resistance of paper-making fabrics, which is the problem in (b), and the only way to prevent wear of the warp threads is to make the running side of paper-making fabrics a weft wear type. .

However, in recent years, various conditions have been required such as increasing the speed of paper production, increasing the amount of filler used, and increasing the need to manufacture neutral paper, and the wear resistance of papermaking fabrics has become a major problem.

Generally speaking, in order to stabilize the posture of textiles during use and extend their service life, it is desirable for endless fabrics, including papermaking fabrics, to have a skewer-resistant effect on the weft yarns on the running surface. This is because when the warp yarns are dragged, the dimensions of the fabric change, and furthermore, when the warp yarns are dragged and cut, the fabric itself is directly cut, so the service life of warp worn fabrics is shortened.

In order to improve such abrasion resistance, attempts have been made to use abrasion-resistant polyamide yarns for the weft yarns, but these attempts do not change the structure of the fabric itself, but simply use The papermaking fabrics using polyamide yarns had the disadvantage of poor postural stability.

Therefore, in the past, polyester yarns with excellent rigidity were used for both warp and weft to construct papermaking fabrics that were difficult to stretch and had excellent posture stability.

In addition, even with such conventionally used papermaking fabrics,
In order to meet the above-mentioned requirements, attempts have been made to use yarn with a larger diameter for the weft on the running side of papermaking fabrics, and although the abrasion resistance has been improved to some extent, the weft is too thick and There are many problems in practical use, such as the balance with the warp being disrupted, crimp performance worsening, and wire marks occurring.

Furthermore, as can be understood from the problem (c) above, if the structure of the fabric changes, the aqueous properties will also be affected, and the problem cannot be solved by a palliative measure 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 inventors have solved the following problems:
We invented a special extensible heat-shrinkable polyamide monofilament that exhibits especially excellent abrasion resistance, stability in posture, and surface smoothness when an endless woven fabric is constructed, and by using this filament, we can create an endless woven paper-making fabric. The structure of the paper has been improved to improve abrasion resistance, and at the same time, the paper-making performance, such as P water resistance and wire mark resistance, which are problems specific to papermaking fabrics, has also been improved.

[Means for solving the problems] The present invention has the following features: r1. Extensible heat shrinkable material for endless textiles, which has an elongation of 6% or more when the load changes from 1.25 g/d to 1.75 g/d, and a heat shrinkage rate of 7% or more when immersed in boiling water. Polyamide monofilament.

2. When a load is applied at a speed of 2 rm/min, the elongation is 6% or more when the load changes from 1.25 g/d to 1.75 g/d, and the heat shrinkage rate when immersed in boiling water is 7% or more, an extensible heat-shrinkable polyamide monofilament for endless textiles.

3. An endless woven fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged at least in the weft.

4. An abrasion-resistant papermaking fabric comprising an extensible heat-shrinkable polyamide monofilament according to claim 1 arranged at least in the weft.

5. The abrasion-resistant papermaking fabric according to claim 2, wherein the extensible heat-shrinkable polyamide monofilament is arranged at least in the weft.

66. An endless weft multi-woven fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged in at least the wefts of the endless weft multi-woven fabric in which yarns are arranged in upper and lower multilayers.

7. An endless weft multilayer fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged in the wefts of at least the running surface of an endless weft multilayer fabric in which wefts are arranged in upper and lower multilayers. fabric.

8. A wear-resistant papermaking weft multilayer fabric in which the extensible heat-shrinkable polyamide monofilament according to claim 1 is arranged at least in the weft of a papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. fabric.

9. Claim 1 for at least the wefts on the running surface of a papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface.
A wear-resistant weft-multiplex fabric for papermaking in which extensible heat-shrinkable polyamide monofilaments are arranged, as described in .

10. A wear-resistant paper manufacturing fabric in which the extensible heat-shrinkable polyamide monofilament according to claim 2 is arranged at least in the wefts of a weft multilayer fabric for paper making in which the wefts are arranged in multiple layers above and below the paper making surface and the running surface. Weft multiple fabric.

11. *An abrasion-resistant fabric in which the extensible heat-shrinkable polyamide monofilament according to claim 2 is arranged in the weft of at least the running surface of a papermaking weft multilayer fabric in which yarns are arranged in multiple layers above and below the papermaking surface and the running surface. Weft multiple fabric for paper making.

12. Ordinary polyamide monofilament and/or polyester monofilament as described in any one of claims 1 to 2 in at least the weft of the weft multilayer fabric for paper making in which the weft is arranged in multiple layers above and below the paper making surface and the running surface. Arranged in combination with extensible heat-shrinkable polyamide monofilament, weft multiplicity # for wear-resistant papermaking! III.

13. Ordinary polyamide monofilament and/or polyester monofilament as described in any one of claims 1 to 2, in at least the running surface weft of the paper-making weft multilayer fabric in which the wefts are arranged in multiple layers above and below the paper-making surface and the running surface. An abrasion-resistant weft-multiplex fabric for papermaking, which is arranged in combination with extensible heat-shrinkable polyamide monofilament. ”
Regarding.

There are various factors that make paper-making fabrics exhibit the above-mentioned properties, and among them, the most important factor is the filaments that make up the fabric. Although the filament material itself has a large effect, the physical performance added by filament processing also has a large effect. Synthetic resin monofilaments are said to be preferable as the filaments constituting the paper-making fabric from the viewpoints of abrasion resistance and gate properties.

Although the weft and warp yarns of conventionally used synthetic resin monofilaments are bent by the weaving force during weaving, they only undergo elastic deformation and not plastic deformation, and straighten immediately after the applied force is removed. It has the property of returning to its original state.

The extensible heat-shrinkable polyamide monofilament for paper-making fibers of the present invention has properties completely different from those of conventionally used monofilaments. That is, the extensible heat-shrinkable polyamide monofilament for papermaking fabrics of the present invention is a very special filament that has high elongation and high heat-shrinkability. That is, per 1 denier,
It has special properties such as an elongation of 6% or more when the load changes from 1.25 to 1.75g (expressed in g/d), and a heat shrinkage rate of 7% or more when not immersed in boiling water. This is a novel monofilament that has not been previously known.

The above-mentioned special extensible heat-shrinkable polyamide monofilament of the present invention can be produced by adjusting the degree of stretching and relaxation of the filament and the processing temperature to impart the above-mentioned elongation and high heat-shrinkability. The above-mentioned special extensible heat-shrinkable polyamide monofilament of the present invention exhibits excellent woven posture stability and surface smoothing effect. In addition, the papermaking fabric of the present invention has an improved structure using the above-mentioned special extensible heat-absorbing polyamide monofilament, so the papermaking properties on the papermaking surface are good, and the P water resistance and wire mark properties are also greatly improved. In addition, the paper quality of the paper produced is also good.

I will explain this in detail later, but as mentioned above, even if thick yarn is used for the weft, the abrasion resistant volume will not necessarily increase. The shape of the crimp is an issue. When the weft has a sufficiently bent structure, the crimp of the weft has a rectangular cross-section, that is, a three-dimensional cylinder, and the effective wear-resistant volume is maximized.

Moreover, since m-pieces for paper manufacturing are subjected to large tension in the warp direction during use, it is effective for the warp threads not to be bent to maintain the posture without warping even when subjected to tension.

Since woven fabrics are formed by intersecting warp and weft threads,
In papermaking fabrics, it is important that the warp yarns are not bent, that is, that the weft yarns have a relatively sufficiently bent structure.

In order to stabilize the posture of a papermaking fabric, it must withstand not only tension in the warp direction but also loads from any direction, such as the weft direction and the vertical direction.FA fabrics essentially have warps and wefts that intersect and are woven into m&1. By fixing both threads in a sufficiently crossed state, the stability of the overall posture is significantly improved. That is, if the warp and weft yarns can be fixed and integrated in a completely intersecting state by sufficient bending of the weft yarns, the woven fabric can exhibit excellent posture stability similar to that of a molded article.

By the way, until now, such textiles are completely unknown. This is because ordinary textiles are required to have the characteristics of textiles, such as flexibility, texture, and good touch, and for this purpose, stretch and softness are necessary, and although posture stability is necessary, posture is too much. In fact, licks were avoided because they lacked flexibility, texture, and feel when they were too stable. As described above, papermaking fabrics belong to a special technical field that requires properties completely different from those of ordinary fabrics. Therefore, the reality is that there is still no fabric for papermaking that satisfies the above-mentioned requirements, and there is also no filament constituting such a fabric.

The present inventors have solved the above-mentioned requirements for paper manufacturing! As a result of intensive research to provide one product, this papermaking fabric is
We discovered that this could not be achieved by constructing the same filament as used in #1 products, and that a special filament needed to be used, and invented an extensible heat-shrinkable polyamide monofilament that is necessary for constructing paper-making fabrics. This is why we invented fibers for papermaking that have excellent functions and effects.

The special polyamide monofilament of the present invention for forming a paper fabric in which the weft is sufficiently bent and the whole is fixed together has a weight of 1°25 g/d to 1.25 g/d per denier.
This extensible heat-shrinkable polyamide monofilament has an elongation of 6% or more with respect to a load change of 75 g/d, and a heat shrinkage rate of 7% or more when immersed in boiling water.

This filament is a new polyamide monofilament that was completely unknown before the application of this application. Ordinary polyamide monofilament that does not meet the above requirements deforms lazily and continuously when a load is applied. However, the extensible heat-shrinkable polyamide monofilament for papermaking fabrics of the present invention, which does not exhibit the behavior of deforming only when it is deformed, does not have a plastic deformation yield point. It is sufficiently bent by the weaving force of the loom applied to the weft during weaving,
It has a unique effect in that it deforms and intersects with the warp threads, and does not return to its original shape even if thrown from the loom.

Polyamide monofilaments that do not meet the above-mentioned specific requirements are not bent sufficiently by the weaving force of the loom during weaving, and are only elastically deformed, so that when they are separated from the loom, they slowly deform and return to their original shape.

What is important here is that, unlike ordinary monofilaments, the extensible heat-shrinkable polyamide monofilament of the present invention does not return to its original state even when a load or force is removed. Therefore, a woven fabric using this yarn as a weft can be formed into a woven fabric in which the weft is sufficiently bent during the weaving stage and has extremely excellent posture stability and surface smoothness.

As mentioned above, the extensible heat-shrinkable polyamide monofilament of the present invention has extremely high heat-shrinkability, so it shrinks significantly in the heat-setting process after weaving, and the weft has a sufficiently bent shape and the warp. The fabric is firmly gripped and heat-set, resulting in extremely good posture stability of the fabric. Furthermore, the weft yarns are sufficiently bent during weaving and are greatly heat-shrinked in a state that protrudes between the warp yarns, so that the weft chrysoline 1 has a rectangular longitudinal section between the warp yarns, and its effective abrasion-resistant volume becomes extremely large. This unique extensible heat-shrinkable polyamide monofilament increases abrasion resistance when placed on the weft of the running surface of papermaking fabric, but when placed on the papermaking side, the surface becomes smooth and paper quality is improved. The papermaking fabric of the invention has extensibility heat II3! In addition to so-called single-filament fabrics in which shrinkable polyamide monofilament wefts are arranged in a single layer, it also includes weft-multiple papermaking fabrics in which these wefts are arranged in multiple layers.The extensible heat-shrinkable polyamide monofilament of the present invention may be used alone. can also be used in combination with other monofilaments.

Other monofilaments used in combination include ordinary polyester monofilaments and polyamide monofilaments. These ordinary monofilaments can be used as long as the effects of the special extensible heat-shrinkable polyamide monofilament of the present invention are not impaired.

In addition, the extensible heat-shrinkable polyamide monofilament of the present invention can be placed in the warp or both the warp and warp.To repeat, the extensible heat-shrinkable polyamide monofilament of the present invention has specific performance, large elongation, and heat-shrinkability. The long heat-shrinkable polyamide monofilament, which has an extremely large length, is a novel filament that was completely unknown before this application, and the papermaking fabric of the present invention, which achieves special effects by using this filament, was also completely unknown. It is a new textile.

The monofilament of the present invention must have an elongation of 6% or more with respect to a specific change in load, and a heat shrinkage rate of 7% or more when immersed in boiling water.Polyamide monofilaments with an elongation of 6% or less will leave the loom. Monofilament elastically deforms and returns to its original shape, resulting in no bending and it is not possible to form a fabric with sufficiently curved weft yarns.Furthermore, monofilament with a heat shrinkage rate of 7% or less has a small heat shrinkage and maintains a good posture even after heat setting. The stability of phosphorus 1 cannot be obtained, and it does not form a good phosphorus 1.Incidentally, if we look at the polyamide monofilament of conventionally known papermaking fabrics, 1
．． The elongation is less than 5% when the load changes from 25g/d to 1.75g/d, and the heat shrinkage when immersed in boiling water is only 64.5% or less. [Function] The function and characteristics of the invention will be explained in order with respect to extensible heat-shrinkable polyamide monofilament and papermaking fabric.

The extensible heat-shrinkable polyamide monofilament of the present invention not only has the above-mentioned properties of plastic deformability and heat-shrinkability, but also has the effect that the width of the fabric does not shrink when woven.

In other words, normal weft yarns are elastically deformed and bent during weaving. However, since it is held down by the reed, it does not return to its original width and the width is maintained, but immediately after leaving the machine, the weft recovers its elasticity and no longer bends, and theoretically the width increases, but in reality, the warp of the fabric Because of the strong tension, the weft yarns bend more than during weaving, and the width of the fabric shrinks significantly from the width immediately after leaving the loom, resulting in a lack of stability.

By the way, the extensible heat-shrinkable polyamide monofilament of the present invention, which has an elongation of 6% or more with respect to a specific change in load, is a flexible yarn, so it can be sufficiently bent by the force applied during weaving, and deforms in that state, even when the load is removed. Because it will not return to normal #A
When the robot leaves the aircraft, the width of the vehicle does not shrink and its posture becomes stable.

This effect is extremely desirable for endless fabrics that require precise dimensional accuracy.Next, we will explain the effects of papermaking fabrics in which this extensible heat-shrinkable polyamide monofilament is arranged in the weft.4
do.

The service life of papermaking fabrics is increased by increasing the wear-resistant volume of the weft yarns forming the running surface.

This means that single f! The same applies to woven fabrics and double weft fabrics. In other words, 1 to run! ! As mentioned above, when the warp threads of an end-shaped textile are worn out and cut, the endless textile is cut and its useful life is over, so it is necessary to prevent the warp threads from being subjected to abrasion. Therefore, the weft is made to have wear resistance.

In order to increase the wear-resistant volume of the weft yarns that form the running surface, it may be possible to arrange weft yarns with a large diameter in these weft yarns, but this alone has drawbacks as mentioned above, and is not effective. The wear-resistant volume is not large enough,
In addition, the longer the length of the weft crimp, that is, the knuckle where the warp and weft intersect and the weft is bent by the warp, and the length of the weft that protrudes onto the running surface between the knuckles, the larger the 1li1 wear volume should be. However, research by the present inventor has revealed that actually, this alone does not necessarily increase the f1 wear volume.

As a result of further research on this point, the inventor found that there is a large difference between the apparent wear-resistant volume of the weft and the effective wear-resistant volume, and that even if the apparent wear-resistant volume is increased, there is no wear-resistant effect. Shina.

In other words, in actual textiles, at the knuckle where the warp and weft intersect and the yarn is sharply bent, there is a ring-shaped portion in the weft on the running surface that does not have a wear-resistant effect.

One of the features of the papermaking fabric of the present invention is that by arranging extensible heat-shrinkable polyamide monofilaments with special performance in the weft yarns on the running surface, the weft yarns are sufficiently bent to protrude between the warp yarns, and the weft yarns are crimped. In addition to making the weft longer, the weft is greatly shrunk in the heat-setting process by taking advantage of its high heat shrinkability, and the weft crimp formed between the warp is rectangular in the longitudinal direction, and circular in three dimensions. The reason for this is that the part that does not perform the abrasive action is reduced, and the effective thickness of the body is significantly increased.

Another feature of the present invention is that by placing a special extensible heat-absorbing polyamide monofilament in the weft, the weft is sufficiently bent at the knuckle where the warp and weft intersect, and in that state, the weft deforms and heats the warp. Since it is fixed, the knuckle part is fixed and the posture stability is extremely good.

The feature of the pond of the present invention is that by arranging special extensible heat-shrinkable filaments on the weft yarns on the running surface, the weft yarns are sufficiently bent at the knuckle part, and in that state, the weft deforms and grips the warp yarns, so that the weft yarns can be deformed and grip the warp yarns. The surface of the running surface becomes smooth, and contact with the paper machine foil becomes uniform, improving dewatering performance.

Furthermore, it has good adhesion to the guide roll and provides good guiding performance. This effect of improving guideability is an effect common to endless fabrics.

The feature of the pond of the present invention is that by arranging the above-mentioned weft yarns on the paper-making surface, the paper-making surface becomes smooth, the paper quality improves, and the support properties of pulp fibers and wire mark properties are also improved.

Other important features of the papermaking fabric of the present invention are 2. There is no selvage curl in the papermaking fabric. In the multi-layered fabric for paper manufacturing, which is currently most commonly used, the surface of the fabric must be smooth, so relatively stiff yarns are used for the weft in the upper layer to minimize bending and the crimp is placed at the same height as the warp. I have to. Therefore, the weft yarns in the upper layer have a high thermal shrinkage rate, while the weft yarns in the lower layer are bent to form a sufficiently long cling to increase wear resistance and prevent the warp yarns from being exposed to the paper-making surface to prevent wear. In other words, the thermal shrinkage rate of the weft yarns in the lower layer is small.
With this structure, during the heat-setting process, the weft yarns in the upper layer have a large heat-shrinkability, so a force acts on the upper layer's textile structure to shrink in the middle direction, and the lower layer's Mi weave tends to stretch in the middle direction. Because of this force, curls occur in the edges of the fabric. Therefore, when the long heat-shrinkable monofilament of the present invention is used for the weft of the lower layer, it has good crimpability and large shrinkage, so it exerts a shrinking force in the width direction equal to or greater than that of the upper layer, so the edges of the fabric are curled. If curling occurs in the ears, not only will the width shrink, but it will also be difficult to control the running position.

The papermaking fabric of the present invention includes multi-layered fabrics in which the wefts are arranged in double or triple layers, as well as single-filament fabrics in which the wefts are arranged in a single layer.
As can be understood from the above characteristics, in the case of weft-multiple solids in which the wefts are arranged in multiple layers above and below the paper-making surface and the running surface, it is possible to arrange the wefts suitable for the configuration of each surface on each weft, so the present invention The effects of the extensible heat-shrinkable polyamide monofilament are extremely well exhibited, and a multi-woven fabric for paper making with excellent paper quality and excellent abrasion resistance can be provided. The papermaking fabric of the present invention is woven using a special extensible heat-shrinkable polyamide monofilament for the weft as described above, but the shrinkable weft is strongly fixed by heat-setting after weaving. It will not change, deform, or bend.

Incidentally, the increase in the wear-resistant volume and the increase in the wear resistance will be specifically explained in the following example section while comparing with the conventional example.

[Example] The present invention will be explained in detail based on the drawings, and then comparative tests will be shown to explain the effects.

In each drawing, the warp threads are represented by Arabic numbers, e.g. 1.2.3,
The upper wefts are designated by dashed Arabic numerals, e.g. 1', 2', 3', and the lower wefts are designated by double dashed Arabic numerals, e.g. 1", 2", 3".

FIG. 1 is a front view showing a portion of a heavy woven fabric for papermaking in which the extensible heat-shrinkable monofilament of the present invention is arranged in the weft. FIG. 2 is a sectional view showing a cross section of the fabric shown in FIG. 1 taken along the 1-' line. It can be seen that the weft 5' is interwoven with warp threads 1.5.9 and passes under warp threads 2.3.4 and 6.7.8 to form a cling of three warp threads. Since the 1s yarn 5' is an extensible heat-shrinkable polyamide monofilament with specific properties, i.e., high elongation and heat-shrinkability, it is sufficiently bent and deformed during weaving, and is further strongly heat-shrinked to create a smooth structure between warp threads 1 and 5. A large protruding crimp is formed on the lower surface, and this crimp produces a wear effect. It is also understood that the weft threads are sufficiently bent and fixed, gripping the warp threads strongly, and that the warp threads are not exposed to the surface of the running surface. Due to the elongation effect and heat shrinkage effect, the weft yarn 5' bends almost perpendicularly to both sides of the warp yarn 1.5.9, and the crimp of the weft yarn has a rectangular shape on the 1lIFIfr plane, and is cylindrical in terms of a standing tree, which can be understood from this rectangular shape in longitudinal section. The wear-resistant volume is maximized. It can be seen that the lower surface of the crimp becomes flat and the running surface becomes smooth.

The embodiment shown in FIG. 3 is a front view showing a portion of a papermaking double-woven fabric in which the extensible heat-shrinkable monofilament of the present invention is arranged in the lower weft. FIG. 4 is a sectional view showing a cross section of the fabric shown in FIG. 3 taken along line m-m'. In this example, the extensible heat-shrinkable polyamide monofilament of the present invention is arranged as the lower layer weft, while the ordinary polyester monofilament is arranged as the upper layer weft. The lower weft 14'' is woven by the warp 1.9.17, warp 2-8 and 10.
It can be seen that the crimp for seven warp threads is formed by passing under the warp threads 16 to 16. This crimp has a shape in which the lower weft yarns 14'' are sufficiently bent during weaving and undergoes plastic deformation, and are further strongly heat-shrinked in the heat-setting process, so that they protrude significantly to the lower surface between the warp yarns 1 and 5. Provides anti-wear effect.

It is understood that in this example as well, the lower layer weft is sufficiently bent and fixed in the same way as the weft in the example shown in Fig. 1, and that it grips the warp strongly and that the warp is not exposed on the surface of the running surface. be done.

Due to the elongation effect and heat shrinkage effect, the weft 14'' becomes warp 1.9''.
The cling of the weft, which bends almost perpendicularly to both sides of the weft, has a rectangular longitudinal section, and is cylindrical in terms of standing tree, and as can be understood from this shape, the wear-resistant volume is maximum. It can be seen that the lower surface of the crimp becomes flat and the running surface becomes smooth.

On the other hand, since the upper layer weft 14' is a normal polyester monofilament, its crimp shape is arcuate and different from the lower layer weft, and its vertical cross section is not rectangular. Moreover, since the upper surface of the crimp is below the warp, the weft tends to sink downward between the warps, and there is an undeniable tendency for the valves to gather in this recess and form a mat. Although it has excellent abrasion resistance and posture stability, there is a risk of wire marks occurring, and in this respect it is similar to conventional textiles.

The embodiment shown in FIG. 5 is a front view showing a part of a double-woven fabric for paper making in which the extensible heat-shrinkable monofilament of the present invention is arranged in both the upper and lower wefts. FIG. 6 is a sectional view showing a cross section of the fabric shown in FIG. 5 taken along line mm'. The fabric of this example is the same as the fabric of a third country! This is an example in which the fabric has a texture, but the upper layer weft is different, and therefore the surface pattern is different.

In this embodiment, extensible heat-shrinkable polyamide monofilaments having a specific elongation and high heat-shrinkability according to the present invention are arranged in both wefts of the upper layer and the lower layer. Lower layer weft 14
" is woven into the structure by warp 1.9.17 and warp 2~
8 and 10 to 16 to form a crimp for seven warps. In this crimp, the lower layer weft 14'' is sufficiently bent and deformed during weaving, and is further strongly heat-shrinked in the heat-setting process, so that it protrudes significantly to the lower surface between warps 1 and 5 and has a rectangular longitudinal section. has a wear-resistant effect.

It can be seen that in this example as well, the lower weft yarns are sufficiently bent and fixed as in the example shown in FIG. 1, gripping the warp yarns strongly and that the warp yarns are not exposed on the surface of the running surface. .

Due to the elongation effect and heat shrinkage effect, the weft 14'' becomes warp 1.9''.
The crimp of the weft thread bends almost perpendicularly to both sides of the weft thread 17 and has a rectangular longitudinal section and a cylindrical shape in three dimensions, and as can be understood from this shape, the wear-resistant volume is maximized. It can be seen that the lower surface of the crimp becomes flat and the running surface becomes smooth.

On the other hand, the upper layer weft 14'' is woven into the structure by the warps 2 and 5, passes over the warp 3.4, and forms a crimp that protrudes from the underside of the two warps, and similarly, the upper layer weft 14'' is woven into the structure by the warps 2 and 5. Form a protruding crimp on the bottom surface of the two wires.Also,
Between the warps 5 and 10, a crimp is formed that passes over the warps 6, 7, 8, and 9 and largely projects on the upper surface of the four warps. Since the upper layer weft 14'' is also made of the extensible heat-shrinkable polyamide monofilament of the present invention, its crimp shape is 1!1 due to the elongation effect and heat shrinkage effect like the lower layer weft.
! The IR surface becomes rectangular and the upper surface of the crimp becomes flat.

Moreover, the upper surface of the crimp is at the same height as the warp because the crimp protrudes greatly between the warp threads, and the weft threads do not sink downward between the warp threads, and there is a recess between the warp threads. Since no pulp can be formed, there is no accumulation of pulp, and no valve mat formation occurs, so wire marks do not occur.

FIG. 7 is a front view showing a part of a conventionally known papermaking fabric. The filaments used are ordinary polyester monofilaments.

FIG. 8 is a cross-sectional view of the fabric shown in FIG. 7 taken along the line TV-IV'. The weft yarn 5' is interwoven with the warp yarn 1.5.9 and passes under the warp yarn 2.3.4 to form a downwardly protruding crimp, but the shape of the crimp is different from that of the monofilament of the present invention. Since it is only elastically deformed and has low heat shrinkability, it deforms slowly to form a crimp that protrudes downward in an arc shape, and the weft threads are woven into the crimp, like the crimp of the papermaking fabric of the present invention. As can be seen from Figure 6, where the warp bends almost perpendicularly on both sides of the warp and cannot form a crimp with a rectangular longitudinal cross section, wear begins at the arc-shaped protrusion of the crimp and extends to both sides of the warp where the weft is woven. The weft threads of the
The abrasion volume is much smaller than that of the rectangular cross-sectional crimp in the fabric of the invention.

FIG. 9 is a front view showing a part of a conventionally known double-woven fabric for papermaking. The filament used is an ordinary polyester monofilament6, and Figure 10 is the *! of Figure 9! FIG. 3 is a cross-sectional view of tm taken along line VV'. It can be seen that the lower layer weft 14'' is woven by the warps 1, 9, and 17 and passes under the warps 2 to 8 and 10 to 16 to form a crimp for seven warps. This crimp shape differs from the monofilament of the present invention in that the monofilament is only elastically deformed and has low heat shrinkage.
It deforms sloppily and forms a crimp that protrudes downward in an arc shape, and similarly to the conventional example shown in FIG. 7, it is not possible to form a crimp with a rectangular vertical cross section as in the LLI product for paper manufacturing of the present invention. .

As can be understood from the drawings, abrasion begins at the arc-shaped protrusion of the crimp, and the weft yarns on both sides of the warp into which the weft yarns are woven do not act as abrasive, and are more resistant than the crimps with a rectangular longitudinal section in the fabric of the present invention. The wear volume is much smaller.

On the other hand, like the lower layer weft 14'', the upper layer weft 14' is also a normal polyester monofilament, and unlike the monofilament of the present invention, it is only elastically deformed and has low heat shrinkage, so it deforms gently and stretches upward. The crimp forms a protruding arcuate shape, and cannot form a crimp with a rectangular vertical cross section like the crimp of the paper-making double-woven fabric of the present invention.The upper surface of the crimp is also not flat.

It can be seen that the surface of the fiber does not become smooth.

Moreover, the upper surface of the crimp is below the warp threads, so the weft threads are sunken downward between the warp threads, and the valves gather in this recess to form a valve mat, resulting in wire marks.

As described above, the present invention has been explained using papermaking fabric, which is an endless fabric that requires the most severe performance, as a representative example. The woven fabric forms flat surfaces on both the upper and lower surfaces, and a crimp with an extremely large wear-resistant volume on the lower surface, which greatly improves the drag resistance and allows the warp and weft to bend sufficiently and intertwine with each other. Since it is strongly heat-set, the stability of the posture is also very good.Firstly, in order to concretely explain the effects of the present invention, a comparative test with a conventional endless woven fabric will be shown.

Effect Comparison Test Example 1 A polyester monofilament regular yarn with a wire diameter of 0.17+u+ was used for the warp, and a polyester monofilament yarn with a wire diameter of 0.17 rgm was used for the upper weft.
．． The elongation rate when the load changes from 25 g/d to 1.758/d is 6.5%, and the heat shrinkage rate in boiling water is 7.2.
The polyamide (nylon 6) monofilament of the present invention, which is The polyamide (nylon 6) monofilament of the present invention, which has a heat shrinkage rate of 9.3% and a heat shrinkage rate of 12.5% in boiling water, and regular polyester monofilament yarn with a wire diameter of 0°22 are alternately arranged and woven. A woven fabric having an 8-shaft weft double weft structure was prepared using the above steps, and this woven fabric was heat-set to obtain Sample 1, which is an example of the present invention. FIGS. 5 and 6 show the structure and shape of Sample 1, and Table 1 shows the thread density, etc.

On the other hand, using the same warp as the above fabric, polyamide (nylon 6) regular monofilament yarn with the same diameter is placed in the upper weft, and polyester monofilament regular yarn and polyamide (nylon 6) monofilament regular yarn with the same diameter are placed in the lower weft. Alternately arranged and woven, 8 shafts and wefts and 2 f
A woven fabric with i-tissue was prepared, and this woven fabric was heat-set to obtain Conventional Example 1.
I got it.

FIGS. 9 and 10 show the structure and shape of Conventional Example 1, and Table 1 shows the yarn density, etc., and Table 1 shows test results for these two fabrics.

Table 1 Sample 1 Conventional example 1 Warp density (book/piece) 155 155 upper weft density (same) 58 58 lower weft density (
Same) 58 58 Seat smoothness ↑ (seconds) 89 77 Running surface wear-resistant volume 2 (shaft/hand''2) 25 16 Ear curl 3 (stop) 0 Life cycle ratio 4 140 Zo.

[Note] 1. Sheet smoothness: The raw material pulp containing medium-quality paper was tested using the Tappi Standard Sheet Test Machine with a basis weight of 70 g/rrr.
A paper sheet of equivalent size was made into a smooth sheet according to a conventional method, and the smoothness of the surface of the paper that was in contact with the fabric surface was measured using a Beck smoothness meter.

2. Abrasion resistance volume of the running surface Calculated volume of warp and weft from the cross section of the two-tapered object until the warp cross section on the running surface side becomes 50% 3. Amount of edge curl = The fabric is made into an endless shape, and this is 2. A roll of books was stretched under tension of 12 kt/011''C, and the height change from the horizontal part of the fabric to the edge of the fabric when wetted with water was measured.

4. Lifespan ratio Testing was carried out using an abrasion tester manufactured by Nippon Filcon Co., Ltd. (Registered Utility Model No. 1350124) and using heavy calcium carbonate as a filler.

Example 2 A polyester monofilament regular yarn with a wire diameter of 0.20rm is used for the warp, a polyester monofilament regular yarn with a wire diameter of 0.19oon is used for the upper weft, and a wire diameter of 0 is used for the lower weft.
．． Polyamide (nylon 6) monofilament of the present invention having an elongation of 9.3% with respect to a load change of 22 nnn from 1.25 g/d to 75 g/d and a heat shrinkage rate of 12.5% in boiling water. were arranged and woven to create a fabric with an eight-shaft and weft double structure, and this fabric was heat-set to obtain Sample 2, which is an example of the present invention. Figures 3 and 4 show the structure and shape of sample 2, and Table 2 shows the yarn density, etc. On the other hand, the same warp and upper weft as the above fabric were used, and the upper weft was made of polyamide (nylon) with the same thread diameter. 6) Conventional Example 2 was obtained by arranging and weaving monofilament ordinary yarns to create a fabric with an 8-shaft and weft double structure, and heat-setting this fabric. FIGS. 9 and 10 show the structure and shape of Conventional Example 2, and Table 2 shows the thread density, etc.

1'lll/me'' Ear curl amount 3 (Im!1)015 Life cycle ratio 4 189 100 Table 2 shows the test results for these two fabrics.

Table 2 Sample 2 Conventional example 2 Warp density (cotton/mill) 148 148 top weft density (same) 50 50 top weft density (same)
50 50 Sheet smoothness (seconds) 75 70 Running surface wear resistance volume 2 [Note] 1. Sheet smoothness: Use beaten newspaper as a raw material, and measure r basis weight 70 g/
A paper sheet equivalent to RD was made into a smooth sheet according to a conventional method, and the smoothness of the paper surface that was in contact with the fabric surface was measured using a Beck smooth needle.

2. Running surface filtration resistance volume: The value calculated by calculating the volume of warp and weft from the cross section of the II material until the warp cross section on the running surface side becomes 50%. 3. Amount of edge curl: was stretched between two rolls at a tension of 12 kg/cm, and the change in height from the horizontal portion of the fabric to the edge of the fabric when wetted with water was measured.

4. Lifespan ratio wear test made by Nippon Filcon Co., Ltd.! (Registered Utility Model No. 1350124) was used, and heavy calcium carbonate was used as the filler.

Example 3 A polyester monofilament regular yarn with a wire diameter of 0.25 m is used for the warp, and a wire diameter of 0.30 m is used for the weft, 1 □ 25 g/
The elongation rate for a load change of 1.75 g/d from d is 6,
The polyamide (nylon 6/10) monofilament of the present invention, which has a heat shrinkage rate of 8.0% in boiling water, was arranged and woven to create a fabric with a four-shaft satin weave structure. Sample 3, which is an example of the present invention, was obtained by heat fixing.

FIGS. 1 and 2 show the structure and shape of Sample 3, and Table 3 shows the thread density, etc.

On the other hand, weaving was carried out using the same warp and polyamide (nylon 6/10) monofilament regular yarns with the same thread diameter as the weft to create a fabric with a 4-shaft satin weave structure, and this fabric was heat-set. Conventional example 3 was obtained. FIGS. 7 and 8 show the structure and shape of Conventional Example 3, and Table 3 shows the thread density, etc.

The test results for these two fabrics are shown in Table 3.

Table 3 Conventional sample warp density (thread/me') Weft density (same) Sheet smoothness (seconds) Running surface wear-resistant body WL2 (round/Z>2) Edge curl amount S (m) Life number ratio 4 [ Note] 1. Sheet smoothness: Used as a raw material by beating cardboard waste paper, and using a Tatsubi standard sheet test machine to
A sheet of paper equivalent to g/rrF was made into a smooth sheet according to a conventional method, and the smoothness of the paper in contact with the fabric surface was measured using a Beck smooth needle.

2. Running surface iir! Abrasion volume: The volume of the warp and weft from the cross section of the la material until the warp cross section on the running surface side becomes 50% is 3. Ear curl amount: 1 The IIi material is made into an endless shape, and this is 2.
The book was stretched on a roll with a tension of 12 kg/■, and the change in height from the horizontal part of the fabric to the edge of the fabric when wet with water was measured.

4. Lifespan ratio Testing was carried out using an abrasion tester manufactured by Nippon Filcon Co., Ltd. (Registered Utility Model No. 1350124) and using heavy calcium carbonate as a filler.

[Effects] As is clear from the above examples, the fabric of the present invention has a smoother fabric surface compared to the conventional example, has no edge curl, and has excellent running properties, and has excellent running surface wear resistance. Due to the increase in product, the number of service lives has increased significantly.

[Brief explanation of drawings]

FIGS. 1 to 6 are a partial plan view and a sectional view of a papermaking fabric of the present invention, and are examples of the present invention. FIGS. 7 to 10 are a partial plan view and a sectional view of a conventional papermaking fabric. 1 to 17...Warp 1' to 17'...Weft 1'' to 17''...Lower weft Figure 1 Section 3 Figure 2 Figure 4UX1 5r: HI Figure 6 70th 80th

Claims (1)

[Claims] 1. Elongation is 6% or more with respect to a load change from 1.25 g/d to 1.75 g/d, and when immersed in boiling water,
An extensible heat-shrinkable polyamide monofilament for endless textiles having a heat shrinkage rate of 7% or more. 2. 1.2 when the load is applied at a speed of 2 mm/min
The elongation is 6 when the load changes from 5g/d to 1.75g/d.
% or more, and the heat shrinkage rate when immersed in boiling water is 7.
% or more, an extensible heat-shrinkable polyamide monofilament for endless textiles. 3. An endless woven fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged at least in the weft. 4. A wear-resistant papermaking fabric comprising the extensible heat-shrinkable polyamide monofilament according to claim 1 arranged at least in the weft. 5. An abrasion-resistant papermaking fabric in which the extensible heat-shrinkable polyamide monofilament according to claim 2 is arranged at least in the weft. 6. An endless weft multilayer fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged at least in the wefts of an endless weft multilayer fabric in which weft yarns are arranged in upper and lower multilayers. 7. An endless weft multilayer fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged in the wefts of at least the running surface of an endless weft multilayer fabric in which wefts are arranged in upper and lower multilayers. fabric. 8. A wear-resistant papermaking weft multilayer fabric in which the extensible heat-shrinkable polyamide monofilament according to claim 1 is arranged at least in the weft of a papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. fabric. 9. A wear-resistant papermaking weft in which the extensible heat-shrinkable polyamide monofilament according to claim 1 is arranged in the weft of at least the running surface of a papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. Multiple fabrics. 10. A wear-resistant papermaking weft in which the extensible heat-shrinkable polyamide monofilament according to claim 2 is arranged at least in the weft of a papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. Multiple fabrics. 11. Claim 2 for at least the wefts on the running surface of a papermaking weft multiple fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface.
An abrasion-resistant weft-multiplex fabric for papermaking, in which extensible heat-shrinkable polyamide monofilaments are arranged, as described in . 12. A papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface, at least in the wefts, a normal polyamide monofilament and/or polyester monofilament, as described in any one of claims 1 to 2. A wear-resistant weft-multiplex fabric for papermaking, which is arranged in combination with extensible heat-shrinkable polyamide monofilament. 13. Ordinary polyamide monofilament and/or polyester monofilament as described in any one of claims 1 to 2, in at least the running surface weft of the papermaking weft multilayer fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. An abrasion-resistant weft-multiplex fabric for papermaking, which is arranged in combination with extensible heat-shrinkable polyamide monofilament.