JP2799728B2 - Stretchable heat-shrinkable polyamide monofilament for endless fabric and endless fabric - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an extensible heat-shrinkable polyamide monofilament for endless woven fabric, and an abrasion-resistant endless woven fabric in which the filament is arranged, particularly a wear-resistant papermaking woven fabric. .

[Related Art] There are many endless woven fabrics conventionally used, such as, for example, a conveyor belt, a dewatering belt, an overcloth, a power transmission belt, a dry canvas for papermaking, a felt for papermaking, and a woven fabric for papermaking. All of these endless fabrics receive strong tension in the warp direction during use, so they expand in the warp direction and shrink in the weft direction, that is, the length is reduced in length, and the length is also increased in the vertical direction due to the load in the vertical direction. There is a problem that posture stability is poor because of contraction. In addition, there is another problem that abrasion resistance must be high because the abrasion is caused by contact with a driving roll, a control roll and the like during traveling. In addition, the running surface must be smooth for smooth running, and the upper surface needs to be flat in view of placing an object on the running surface. Such problems are common to endless woven fabrics, but have not yet been satisfactorily solved. The present invention has solved these problems.

Among the endless fabrics, the most demanding of these properties is a papermaking fabric. Papermaking fabrics are required to have various performances unique to papermaking in addition to the above-mentioned performances.However, if the common problems described above for papermaking fabrics are described, almost all problems common to endless fabrics and their solutions can be explained. Because it can be understood, the present invention will be described below with paper fabrics as a representative.

In addition to the above problems, there are more demands for papermaking fabrics than before. Broadly speaking, (a) problems related to paper quality itself, such as preventing the occurrence of wire marks and sufficient entanglement of paper fibers, or problems with papermaking yield, (b) improving abrasion resistance, extending the service life of textiles, (C) Good aqueous problems. Although each of the problems is often related to each other, roughly speaking, the problem (a) is mainly related to the structure of the papermaking surface of the fabric.
(B) is closely related to the structure of the running side surface of the fabric, and (c)
Is a problem for the whole fabric.

Conventionally, many proposals have been made for the solution (a). However, the problem of (b), that is, the improvement of the wear resistance of the papermaking fabric has not been sufficiently devised, and the running side of the papermaking fabric is of a weft-wear type, and is limited to the extent of preventing warp abrasion. .

However, in recent years, various conditions such as an increase in papermaking speed, an increase in the amount of filler used, and an increase in the necessity of producing neutral papermaking have been required, and the abrasion resistance of the papermaking fabric has become a major problem.

Generally speaking, from the viewpoint of the stability of the posture of the woven fabric during use and the extension of the service life, it is desirable that the endless woven fabric, including the woven fabric for papermaking, exert a wear-resistant action on the weft on the running surface.
When the warp wears, the dimensions of the fabric change, and when the warp wears and cuts, the fabric itself cuts directly,
This is because the warp abrasion type woven fabric has a short service life.

Conventionally, in order to improve such abrasion resistance, an attempt has been made to use a polyamide yarn having abrasion resistance for the weft, but this attempt does not change the structure of the woven fabric itself, but simply uses it. No epoch-making effect can be obtained merely by utilizing the properties of the material. On the other hand, the papermaking woven fabric using polyamide yarn has a drawback that posture stability is poor.

Therefore, conventionally, a papermaking woven fabric which is hard to stretch and has excellent posture stability has been constituted by using a polyester yarn having excellent rigidity for both the warp and the weft.

Further, even in such a conventionally used papermaking fabric, in order to satisfy the above-described various requirements, it has been attempted to use a thick wire diameter yarn as the weft on the running side of the papermaking fabric,
Although the abrasion resistance can be improved to some extent, there are drawbacks in that the weft yarn is so thick that the balance between the weft yarn and the warp yarn is lost, the crimping property is deteriorated and wire marks are generated, and there are too many practical problems. .

Further, as understood from the above problem (c), if the structure of the woven fabric changes, the water is affected, and the problem cannot be solved by palliative means such as simply increasing the thickness of the weft.

[Problems to be Solved by the Invention] In view of the problems of the conventional techniques as described above, the present inventor has found that, when an endless fabric is formed, particularly excellent wear resistance,
Generates a special stretchable heat-shrinkable polyamide monofilament that has a stable posture and a surface smoothing effect.By using this filament, the structure of the endless woven paper fabric is improved to improve the abrasion resistance. It also improves papermaking performance such as water-based properties and wire mark properties, which are problems specific to papermaking fabrics.

[Means for Solving the Problems] The present invention relates to the following: "1.
% Or more, and a heat shrinkage rate of 7% or more when immersed in boiling water.

2. When a load is applied at a speed of 2 mm / min from 1.25 g / d to 1.
An extensible heat-shrinkable polyamide monofilament for endless woven fabric, having an elongation of 6% or more with respect to a load change of 75 g / d and a heat shrinkage of 7% or more when immersed in boiling water.

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

4. A wear-resistant papermaking woven fabric comprising the stretchable heat-shrinkable polyamide monofilament according to claim 1 arranged at least on a weft.

5. An abrasion-resistant papermaking woven fabric comprising the stretchable heat-shrinkable polyamide monofilament according to claim 2 arranged at least on a weft.

6. An endless weft multiplex woven fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is disposed on at least the weft of an endless woof multiplex woven fabric in which wefts are arranged in upper and lower multilayers.

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

8. An abrasion-resistant papermaking weft multiplex in which an extensible heat-shrinkable polyamide monofilament according to claim 1 is arranged on at least the weft of a papermaking weft multiplex woven fabric in which wefts are arranged in upper and lower multilayers on a papermaking surface and a running surface. fabric.

9. Wear-resistant papermaking wherein the stretchable heat-shrinkable polyamide monofilament according to claim 1 is disposed on at least the weft on the running surface of a papermaking weft multiple woven fabric in which the wefts are arranged in upper and lower multilayers on the papermaking surface and the running surface. Weft multi-layer fabric.

10. A wear-resistant papermaking weft in which the stretchable heat-shrinkable polyamide monofilament according to claim 2 is disposed on at least the weft of a papermaking weft multiple woven fabric in which the weft is arranged in upper and lower multilayers on a papermaking surface and a running surface. Multiple fabrics.

11. The weft for the papermaking weft multi-layer woven fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface, at least on the running surface weft.
2. A wear-resistant papermaking weft multiple woven fabric, comprising an extensible heat-shrinkable polyamide monofilament described in 1).

12. The method according to any one of claims 1 to 2, wherein a normal polyamide monofilament and / or polyester monofilament is used for at least the weft of the papermaking weft multiple woven fabric in which the weft is arranged in multiple layers above and below the papermaking surface and the running surface. An abrasion-resistant weft multi-layer woven fabric for papermaking, arranged in combination with an extensible heat-shrinkable polyamide monofilament.

13. A normal polyamide monofilament and / or a polyester monofilament according to any one of claims 1 to 2, wherein at least the running surface weft of the papermaking weft multiple woven fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. Abrasion-resistant papermaking weft multiple woven fabric arranged in combination with a stretchable heat-shrinkable polyamide monofilament. About.

There are various factors for exhibiting the above-mentioned various properties in a papermaking woven fabric. Among them, an important factor is a filament constituting the woven fabric. Although the influence of the filament material itself is great, the physical performance added by the treatment of the filament also has a great effect. As the filament constituting the papermaking fabric, a synthetic resin monofilament is considered to be preferable in terms of abrasion resistance and rigidity.

Conventional synthetic resin monofilament weft,
Although the warp yarns are bent by the weaving force during weaving, they are merely elastically deformed and not plastically deformed, and have a property of immediately returning to a straight line when the applied force is removed.

The stretchable heat-shrinkable polyamide monofilament for papermaking fabric of the present invention has completely different properties from such conventionally used monofilaments. That is, the extensible heat-shrinkable polyamide monofilament for papermaking fabric of the present invention is a very special filament having a large elongation and a large heat-shrinkability. That is, a special material that has an elongation of 6% or more for a load change of 1.25 to 1.75 g (expressed in g / d) per denier and a heat shrinkage of 7% or more when immersed in boiling water. It is a novel monofilament that has properties and has never been known before.

The 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 treatment temperature to impart the above-described elongation and large heat shrinkability. The special extensible heat-shrinkable polyamide monofilament of the present invention exhibits excellent woven fabric posture stability and surface smoothing effect. In addition, the papermaking fabric of the present invention uses the above-mentioned special extensible heat-shrinkable polyamide monofilament to improve the structure, so that the papermaking surface becomes good in papermaking properties, and the water and wire mark properties are greatly improved. In addition, the paper quality of the paper to be made becomes good.

As will be described in detail later, as described above, even if a thick yarn is used as the weft, the abrasion resistance volume does not immediately increase. Regarding the abrasion resistance volume, the shape of the crimp of the weft projecting to the running side of the papermaking fabric becomes a problem. If the weft has a sufficiently bent structure, the crimp of the weft is rectangular in cross section, that is, three-dimensionally cylindrical, and the effective wear-resistant volume is maximized.

Further, since the papermaking fabric is subjected to a large tension in the warp direction during use, it is effective that the warp does not bend even if the tension is applied, and that the warp does not stretch. Since the woven fabric is formed by intersecting the warp and the weft, it is important in the papermaking woven fabric that the warp is not bent, that is, a structure in which the weft is relatively sufficiently bent.

The stability of the posture of the papermaking woven fabric must endure not only the tension in the warp direction but also the load from any direction such as the weft direction and the vertical direction. A woven fabric is essentially formed by intersecting a warp and a weft and interweaving each other in a structure. When the two yarns are fixed in a sufficiently crossed state, the stability of the whole posture is remarkably improved. That is, if the warp and the weft can be fixed and integrated in a state where they completely intersect by sufficient bending of the weft, the fabric can exhibit excellent posture stability as a molded article for maintaining the posture.

By the way, such fabrics are not known at all until now. That is why ordinary woven fabrics are required to have the characteristics of woven fabric, such as suppleness, texture, and softness, and for that, stretch and softness are required.
Posture stability was necessary, but it was rather avoided if the posture stability was too strong due to lack of suppleness, feeling, and feel. As described above, papermaking fabrics belong to a special technical field in which characteristics completely different from ordinary fabrics are required. Accordingly, there is no papermaking fabric that satisfies the above-mentioned requirements, and there is no filament that constitutes such a fabric.

The present inventors have conducted intensive studies to provide a papermaking fabric that has solved the above-mentioned requirements. As a result, such a papermaking fabric cannot be realized by using filaments used for ordinary fabrics. The present inventors have clarified the necessity of performing the above, have invented an extensible heat-shrinkable polyamide monofilament necessary for constituting a papermaking fabric, and have invented a papermaking fabric having excellent effects.

The polyamide monofilament of the present invention for forming a papermaking fabric in which the weft is sufficiently bent and the whole is fixed integrally has an elongation of 6 to 1.25 g / d to 1.75 g / d load change per denier. % Or more, and a heat-shrinkable polyamide monofilament having a heat shrinkage of 7% or more when immersed in boiling water.

This filament is a novel polyamide monofilament which is completely unknown before the present application, and a normal polyamide monofilament which does not satisfy the above requirements gently and continuously deforms when a load is applied, and a specific load is applied. It does not behave for the first time when deformed. However, the stretchable heat-shrinkable polyamide monofilament for papermaking fabric of the present invention that satisfies the above-mentioned specific requirements, despite having no yield point of plastic deformation, due to the weaving force of the loom added to the weft during weaving. It has a unique effect that it is sufficiently bent, deformed, intersects with the warp, and does not return to its original state even when it leaves the loom. Satisfying the above specific requirements The polyamide monofilament is not sufficiently bent by the weaving force of the loom during weaving and is only elastically deformed.

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

Since the stretchable heat-shrinkable polyamide monofilament of the present invention has a very high heat shrinkage as described above, it greatly shrinks (shrinks) in the heat fixing step after weaving, and the weft has a sufficiently bent shape, and the warp has a warp shape. The fabric is firmly gripped and heat-fixed, so that the posture stability of the fabric is extremely good. Furthermore, since the weft is sufficiently bent at the time of weaving and greatly shrinks in a state of projecting between the warps, the crimp of the weft becomes a rectangular cross section between the warps and the effective abrasion resistance volume becomes very large. The stretchable heat-shrinkable polyamide monofilament, which is a feature of the present invention, has high abrasion resistance when arranged on the weft on the running surface of the papermaking fabric, but when arranged on the papermaking surface, the surface becomes smooth and the paper quality is improved. The papermaking fabric of the present invention includes not only a so-called single-woven fabric in which stretchable heat-shrinkable polyamide monofilament wefts are arranged in a single layer, but also a weft-multiply papermaking fabric in which the wefts are arranged in multiple layers. The stretchable heat-shrinkable polyamide monofilament of the present invention can be used alone or in combination with other monofilaments. Other monofilaments to be used in combination include ordinary polyester monofilaments and polyamide monofilaments. These ordinary monofilaments can be used within a range that does not impair the effects of the special extensible heat-shrinkable polyamide monofilament of the present invention.

In addition, the stretchable heat-shrinkable polyamide monofilament of the present invention can be arranged on a warp or both. Again, the extensible heat-shrinkable polyamide monofilament of the present invention, which has specific performance, high elongation, and extremely high heat shrinkability, is a novel filament which is completely unknown before the present application, and uses this filament. Thus, the papermaking fabric of the present invention, which exhibits a special action and effect, is a novel fabric which is completely unknown.

The monofilaments of the present invention must have an elongation for a particular load change of 6% or more and a heat shrinkage of 7% or more when immersed in boiling water. A polyamide monofilament having an elongation of 6% or less is elastically deformed when it is separated from the loom and returns to its original state, so that it does not bend and a sufficiently woven weft yarn cannot be formed. Further, in the case of a monofilament having a heat shrinkage of 7% or less, even if heat shrinkage is small, good stability in posture is not obtained, and good crimp is not formed.

By the way, regarding the conventionally known polyamide monofilament of papermaking woven fabric, the elongation is 5% or less for a load change from 1.25 g / d to 1.75 g / d, and the heat shrinkage when immersed in boiling water is Even large ones are less than 4.5%.

The stretchable heat-shrinkable polyamide monofilament having the special physical properties of the present invention is, for example, after a filament extruded from a nozzle is cooled and solidified in a water bath by a usual melt spinning method, and then heated in a hot water bath at 50 ° C to 90 ° C. It can be manufactured by stretching at a stretching ratio of 3.0 to 4.0 times and not performing the relaxation heat setting.

Such a special monofilament is, for example, a polyamide monofilament taken directly from the second codet roll in the melt spinning of a polyamide, and a draw ratio of 3 to 3.5.
According to the present invention, "the elongation is 6% or more for a load change from 1.25 g / d to 1.75 g / d, and when immersed in boiling water,
Heat shrinkage is 7% or more ".

[Action] The action and features of the present invention will be described sequentially for an extensible heat-shrinkable polyamide monofilament and a papermaking fabric.

The extensible heat-shrinkable polyamide monofilament of the present invention has the above-mentioned properties of plastic deformation and heat shrinkability, and also has the effect of preventing the fabric from shrinking in width when woven.

That is, ordinary wefts are elastically deformed and bent during weaving. However, the width is kept without returning to the original state because it is held down by the pod, but the weft recovers elasticity immediately after leaving the loom and does not bend, and the width expands theoretically, but in practice, the warp of the woven fabric is strong Since the weft is stretched to bend more than at the time of weaving, the width of the woven fabric is greatly reduced from the width immediately after leaving the loom, and the posture stability is lacking.

By the way, the elongation for a specific weight change of the present invention is 6%.
Since the stretchable heat-shrinkable polyamide monofilament described above is a flexible yarn, it is bent sufficiently by the force applied during weaving, deformed in that state, and does not return to its original state even when the load is removed. Does not shrink and the posture is stable.
This effect is an extremely preferable effect in an endless fabric requiring accurate dimensional accuracy.

Next, the operation and effect of the papermaking fabric in which the stretchable heat-shrinkable polyamide monofilament is arranged on the weft will be described.

The service life of the papermaking fabric is increased by increasing the abrasion-resistant volume of the weft forming the running surface. This is the same for a single heavy fabric and a weft double fabric. In other words, as described above, the running endless woven fabric is cut when the warp is worn and cut, and the endless woven fabric is cut and its service life is exhausted. Therefore, it is necessary to prevent the warp from being worn. Therefore, the weft is provided with wear resistance.

In order to increase the abrasion resistance volume of the weft forming the running surface, it may be possible to arrange a weft with a large wire diameter on this weft, but this alone has the disadvantages as described above and is also effective. The wear-resistant volume is not large enough. Also, the longer the length of the weft crimp, that is, the knuckle where the warp and the weft intersect and the weft is bent by the warp, and the length of the weft that projects to the running surface between the knuckles, the larger the wear resistance volume should be. However, the present inventor's research has revealed that, in practice, this alone does not necessarily increase the wear-resistant volume.

As a result of further study on this point, the present inventor has found that there is a large difference between the apparent abrasion resistance volume and the effective abrasion resistance volume of the weft, and that even if the apparent abrasion resistance volume is increased, there is no abrasion resistance effect. .

In other words, in an actual woven fabric, there is a portion of the knuckle portion where the warp wefts intersect and where the yarn is sharply bent, and which has no abrasion resistance due to the shape of the crimp, exists in the weft on the running surface.

One of the features of the papermaking fabric of the present invention is that a specially-elongated heat-shrinkable polyamide monofilament is arranged on the weft on the running surface, so that the weft is sufficiently bent and projected between the warps, and the crimp of the weft is performed. In addition, the weft is shrunk greatly in the heat setting process by utilizing the property of large heat shrinkage, and the crimp shape of the weft formed between the warps is rectangular in longitudinal section, three-dimensionally cylindrical, and abrasion resistance of the weft That is, the portion that does not function is reduced, and the effective wear resistance volume is significantly increased.

Another feature of the present invention is that, by arranging a special extensible heat-shrinkable polyamide monofilament on the weft, the weft is bent sufficiently at the knuckle portion where the warp weft intersects, and in that state the weft is deformed and the warp is grasped and heated. Since the knuckle portion is fixed, the posture stability is extremely improved.

Another feature of the present invention is that a special extensible heat-shrinkable filament is arranged on the weft on the running surface, so that the weft is bent sufficiently in the knuckle part and the weft is deformed in that state to grip the warp, so that the fabric is The surface of the running surface becomes smooth, the contact with the foil of the paper machine becomes uniform, and the dewatering property is improved.
Furthermore, the adhesiveness with a guide roll is good and guideability is good. The effect of improving the guide property is an effect common to the endless woven fabric.

Another feature of the present invention is that by arranging the above-mentioned weft on the papermaking surface, the papermaking surface becomes smooth, the paper quality is improved, and the pulp fiber supportability and wire mark characteristics are also improved.

Another important feature of the papermaking fabric of the present invention is the absence of ear curls in the papermaking fabric. In the most commonly used multi-layered papermaking fabrics, the surface of the fabric must be smooth, so the upper weft uses relatively hard yarns, reduces the bending, and crimps to the same height as the warp. I have to. Therefore, the upper layer weft has a large heat shrinkage. On the other hand, the lower-layer weft is formed to have a sufficiently long crimp to increase abrasion resistance, thereby preventing the warp from being exposed to the papermaking surface and preventing abrasion. That is, the heat shrinkage of the lower weft is small.
With such a structure, in the heat fixing step, the upper layer weft has a large heat shrinkage, so that a force contracting in the width direction acts on the upper fabric structure, and the lower side fabric structure tends to expand in the width direction. Due to the force of the action, the ears of the fabric are curled. Therefore, when the stretchable heat-shrinkable monofilament of the present invention is used for the lower weft, the crimping property is good and the shrinkage is large, so that a force that shrinks in the width direction equal to or more than that of the upper layer acts. Does not occur. When curls occur in the ears, not only does the width shrink, but it becomes difficult to control the running position.

The papermaking fabric of the present invention includes, in addition to the multiple fabrics in which the wefts are arranged in a double or triple manner, a single fabric in which the wefts are in a single layer, but as understood from the above-described features, the wefts run on the papermaking surface. In the case of a weft multi-layer woven fabric arranged in upper and lower multilayers on the surface, the effect of the stretchable heat-shrinkable polyamide monofilament of the present invention is extremely excellent because the weft suitable for the configuration of each surface can be arranged on each weft. It is possible to provide a multi-layer woven fabric for papermaking, which is excellent in paper quality and extremely excellent in abrasion resistance. The papermaking woven fabric of the present invention is woven using a special extensible heat-shrinkable polyamide monofilament as the weft as described above. It does not stretch or deform.

The increase in abrasion resistance volume and abrasion resistance will be specifically described in the following Examples in comparison with the conventional example.

Example An example of the present invention will be described with reference to the drawings, and then the effect will be described by showing a comparative test.

In each drawing, the warp yarns are Arabic numerals, for example 1, 2,
3, upper wefts are indicated by dashed Arabic numerals such as 1 ', 2' and 3 ', and lower wefts are indicated by double dashed Arabic numerals such as 1 ", 2" and 3 ".
Indicated by

FIG. 1 is a front view showing a portion of a monowoven woven fabric for papermaking in which an extensible heat-shrinkable monofilament of the present invention is arranged on a weft. FIG. 2 is a sectional view showing a section of the woven fabric of FIG. 1 taken along the line II ′. It can be seen that the weft yarn 5 'is woven by the warp yarns 1, 5, 9 and passes under the warp yarns 2, 3, 4, and 6, 7, 8 to form crimps for three warp yarns. Since the weft 5 'is a specific heat-shrinkable heat-shrinkable polyamide monofilament having high elongation and heat shrinkage, the weft 5' is sufficiently bent and deformed during weaving and heat-shrinks more strongly so that the lower surface between the warps 1 and 5 is formed. The crimp has a large protruding shape, and the crimp has a wear effect. Then, it is understood that the weft is bent and fixed sufficiently, that the warp is strongly grasped, and that the warp is not exposed on the surface of the running surface. Due to the elongation effect and the heat shrinkage effect, the weft 5 'is bent almost perpendicularly to both sides of the warp yarns 1, 5, and 9, and the crimp of the weft becomes a rectangular cross section and a three-dimensional cylinder, which is understood from the shape of the vertical cross section. Thus, the abrasion resistant volume is maximized. It can be seen that the lower surface of the crimp is flat and the running surface is smooth.

The embodiment of FIG. 3 is a front view showing a portion of a papermaking double woven fabric in which the stretchable heat-shrinkable monofilament of the present invention is arranged on a lower weft. FIG. 4 is a sectional view showing a section of the woven fabric of FIG. 3 taken along the line II-II '. In this embodiment, the stretchable heat-shrinkable polyamide monofilament of the present invention is disposed as the lower weft, while the ordinary polyester monofilament is disposed as the upper weft. The lower weft 14 "is woven by warps 1, 9, and 17, and the warps 2 to 8 and 10 to 16
It can be seen that crimps for seven warps have been formed passing underneath. This crimp has a shape in which the lower weft 14 ″ is sufficiently bent at the time of weaving and plastically deforms, and further strongly shrinks in the heat fixing step, so that it protrudes greatly from the lower surface between the warps 1 and 5. It has an anti-wear effect.

In this embodiment as well, the lower layer weft is sufficiently bent and fixed similarly to the weft of the embodiment of FIG. 1, and it is understood that the warp is strongly grasped and the warp is not exposed on the surface of the running surface. Is done.

Due to the elongation effect and the heat shrinkage effect, the weft 14 ″ becomes
The crimps of the wefts that are bent almost vertically on both sides of 17 are rectangular in longitudinal section and three-dimensionally cylindrical, and as can be understood from this shape, the abrasion resistance volume is maximized. Then, it can be seen that the lower surface shape of the crimp becomes flat and the running surface becomes smooth. On the other hand, since the upper weft 14 'is a normal polyester monofilament, its crimp shape is arc-shaped and unlike the lower weft, it does not have a rectangular cross section, the upper surface of the crimp does not become flat, and the fabric surface becomes smooth. No.

Moreover, since the upper surface of the crimp is below the warp,
Since the weft tends to sink downward between the warps, the pulp collects in these recesses, and the tendency to form a mat cannot be denied, and although abrasion resistance and posture stability are excellent, wire marks are generated. And in this regard,
It is the same as a conventional woven fabric.

The embodiment of FIG. 5 is a front view showing a part of a double woven fabric for papermaking in which the extensible heat-shrinkable monofilament of the present invention is arranged on both upper and lower wefts. FIG. 6 shows the woven fabric of FIG.
It is sectional drawing which shows the cross section cut | disconnected by the I 'line. The woven fabric of this embodiment is a woven fabric having the same weaving structure as the woven fabric of FIG. 3, but has a different upper layer weft, and thus has a different surface structure. In this embodiment, stretchable heat-shrinkable polyamide monofilaments having a specific elongation and a large heat-shrinkability of the present invention are arranged on both upper and lower wefts. Lower weft
14 "is woven into the fabric by warps 1, 9, and 17, and
It can be seen that crimps for 7 warp yarns have been formed passing below 8 and 10 to 16. This crimp is the lower weft 1
4 "is sufficiently bent and deformed at the time of weaving, and further strongly shrinks in the heat fixing step, so that it protrudes greatly from the lower surface between the warp yarns 1 and 5, and has a rectangular longitudinal cross section. This crimp has an abrasion resistance effect. .

In this embodiment, as in the embodiment of FIG. 1, the lower layer weft is sufficiently bent and fixed, and it is understood that the warp is firmly gripped and the warp is not exposed on the surface of the running surface. .

Due to the elongation effect and the heat shrinkage effect, the weft 14 ″ becomes
The crimps of the wefts that are bent almost vertically on both sides of 17 are rectangular in longitudinal section and three-dimensionally cylindrical, and as can be understood from this shape, the abrasion resistance volume is maximized. Then, it can be seen that the lower surface shape of the crimp becomes flat and the running surface becomes smooth. On the other hand, the upper weft 14 "is woven into the design by the warp yarns 2 and 5, forms a crimp that passes over the warp yarns 3 and 4 and projects to the lower surface of the two warp yarns, and similarly between the warp yarns 10 and 13 Crimps are formed on the lower surface of the two warps.
A crimp is formed between the 10 and passing over the warp yarns 6, 7, 8 and 9 and largely protruding on the upper surface of four warp yarns. Since the upper weft 14 "is also the extensible heat-shrinkable polyamide monofilament of the present invention, its crimp shape becomes rectangular in longitudinal section due to the elongation effect and the heat shrink effect as in the case of the lower weft, and the upper surface of the crimp becomes flat.

In addition, the upper surface of the crimp is at the same height as the warp because the crimp protrudes greatly between the warps, so that the weft does not sink downward between the warps, and there is a recess between the warps. Since no pulp can be accumulated, no pulp mat is formed and no wire mark is generated.

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 sectional view of the woven fabric of FIG. 7 taken along the line IV-IV '. The weft yarn 5 'is woven with the warp yarns 1, 5, and 9 to form a crimp projecting downward below the warp yarns 2, 3, and 4. The crimp shape is such that the monofilament is different from the monofilament of the present invention. In other words, it is elastically deformed and heat shrinkage is also small, so it forms a crimp that protrudes in an arc shape downwards gently deforming,
Like the crimp of the papermaking fabric of the present invention, it is not possible to form a crimp having a rectangular cross section in a vertical section on both sides of the warp in which the weft is woven. As can be understood from the drawing, the abrasion starts from the arc-shaped protrusion of the crimp, the wefts on both sides of the warp weaving the weft do not perform abrasion action,
The abrasion-resistant volume is much smaller than the crimp having a rectangular longitudinal section in the woven fabric of the present invention.

FIG. 9 is a front view showing a part of a conventionally known double woven fabric for papermaking. The filaments used are ordinary polyester monofilaments. FIG. 10 is a sectional view of the woven fabric of FIG. 9 taken along the line VV '. Lower weft
14 "is woven by warps 1, 9, and 17 and passes under warps 2 to 8 and 10 to 16 to form a crimp for seven warps. This crimp has a monofilament shape. Unlike the monofilament of the present invention, since it is only elastically deformed and has a small heat shrinkage, it undergoes gradual deformation to form a crimp that protrudes downward in an arc shape, similar to the conventional example of FIG. It is not possible to form a crimp with a rectangular longitudinal section, as in papermaking fabrics.

As can be understood from the drawing, the abrasion starts from the arc-shaped protrusion of the crimp, and the wefts on both sides of the warp in which the weft is woven do not perform the abrasion action, and are more resistant than the crimp of the woven fabric of the present invention having a rectangular cross-section in a longitudinal section. The wear volume is much smaller.

On the other hand, the upper layer weft 14 'is also a normal polyester monofilament like the lower layer weft 14 ", so unlike the monofilament of the present invention, it is elastically deformed and has a small heat shrinkage. A crimp that protrudes in an arc shape is formed, and a crimp having a rectangular longitudinal section cannot be formed like the crimp of the double woven fabric for papermaking of the present invention. It turns out that it does not become.

In addition, the upper surface of the crimp is lower than the warp, so that the weft sinks downward between the warps and the pulp gathers in this recess to form a pulp mat,
Wire marks occur.

As described above, the present invention has been described as a representative example of the papermaking woven fabric which is the endless woven fabric required to have the strictest performance, and thus the endless woven fabric having the stretchable heat-shrinkable polyamide monofilament of the present invention arranged therein. The woven fabric has a flat surface on both the upper and lower surfaces, and a crimp with an extremely large abrasion resistance volume is formed on the lower surface.The abrasion resistance is greatly improved, and the warp and weft yarns are sufficiently bent and strongly entangled with each other. Since it is fixed, the posture stability is also very good. Next, in order to specifically explain the effect of the present invention, a comparative test with a conventional endless woven fabric is shown.

Example 1 A polyester monofilament ordinary yarn having a wire diameter of 0.17 mm is used for the warp, and a 1.25 g / d to 1.75 g having a wire diameter of 0.17 mm is used for the upper weft.
The polyamide (nylon 6) monofilament of the present invention having an elongation of 6.5% with respect to a load change of / d and a heat shrinkage of 7.2% in boiling water is arranged.
The elongation for a load change of 0.22 mm from 1.25 g / d to 1.75 g / d is 9.3%, and the heat shrinkage in boiling water is 12.5%.
% Of the polyamide (nylon 6) monofilaments of the present invention and polyester monofilament ordinary yarns having a wire diameter of 1.22 mm are alternately arranged and woven to form an 8-shaft weft double structure woven fabric. Sample 1 which is an example of the present invention was obtained. 5 and 6 show the structure and shape of Sample 1, and Table 1 shows the yarn density and the like.

On the other hand, using the same warp as the above-mentioned woven fabric, a polyamide (nylon 6) monofilament ordinary yarn of the same yarn diameter is arranged as the upper weft, and a polyamide (nylon 6) monofilament ordinary yarn of the polyester monofilament ordinary yarn of the same yarn diameter is arranged as the lower weft. By alternately arranging and weaving, a woven fabric having an 8-shaft weft double structure was prepared, and this woven fabric was heat-fixed to obtain a conventional example 1.
I got 9 and 10 show the structure and shape of Conventional Example 1, and Table 1 shows the yarn density and the like. Table 1 shows the test results for these two fabrics.

[Note] 1. Sheet smoothness: A raw paper pulp containing a medium paper is made into a paper sheet “equivalent to 70 g / m ² basis weight” using a Tappi Standard Sheet Test Machine, and a smooth sheet is prepared according to a conventional method. The smoothness of the surface of the paper which was in contact with the surface of the fabric was measured with a smoothness meter.

2. Abrasion resistance volume of running surface: Value calculated from the volume of warp and weft from the cross section of the fabric to 50% of the warp cross section on the running surface 3. Ear curl amount: Endless woven fabric, two of them Was stretched at a tension of 12 kg / cm and the height change from the horizontal portion of the fabric to the edge of the fabric when wet with water was measured.

4. Ratio of life number Abrasion tester (registered utility model No. 1350124) manufactured by Nippon Filcon Co., Ltd. was used, and heavy calcium carbonate was used as a filler.

Example 2 A polyester monofilament ordinary yarn having a wire diameter of 0.22 mm is used for the warp, a polyester monofilament ordinary yarn having a wire diameter of 0.19 mm is used for the upper weft, and a polyester yarn having a diameter of 0.22 mm is used for the lower weft.
The elongation ratio for a load change from g / d to 1.75 g / d is 9.3%,
The polyamide (nylon 6) monofilament of the present invention having a heat shrinkage rate of 12.5% in boiling water is arranged and woven to prepare an 8-shaft weft double structure woven fabric. The sample 2 which is an example of Example 2 was obtained. Third
4 and 4 show the structure and shape of Sample 2, and Table 2 shows the yarn density and the like. On the other hand, using the same warp and upper weft as the above-mentioned woven fabric, polyamide (nylon 6) having the same yarn diameter as the lower weft
A monofilament ordinary yarn was arranged and woven to prepare a woven fabric having an 8-shaft weft double structure, and the woven fabric was heat-fixed to obtain Conventional Example 2. 9 and 10 show the structure and shape of Conventional Example 2, and Table 2 shows the yarn density and the like.

 Table 2 shows the test results for these two fabrics.

[Note] 1. Sheet smoothness: Newspaper broke was beaten as a raw material, a paper sheet “equivalent to 70 g / m ² basis weight” was made with a Tappi standard sheet test machine, and a smooth sheet was prepared according to a conventional method. The smoothness of the paper surface in contact with the fabric surface was measured with a Beck's smoothness meter.

2. Abrasion resistance volume of running surface: Value calculated from the volume of warp and weft from the cross section of the fabric to 50% of the warp cross section on the running surface 3. Ear curl amount: Endless woven fabric, two of them Was stretched at a tension of 12 kg / cm and the height change from the horizontal portion of the fabric to the edge of the fabric when wet with water was measured.

4. Ratio of life number Abrasion tester (registered utility model No. 1350124) manufactured by Nippon Filcon Co., Ltd. was used, and heavy calcium carbonate was used as a filler.

Example 3 A polyester monofilament ordinary yarn having a wire diameter of 0.25 mm is used as a warp, and a weft yarn having a wire diameter of 0.30 mm is used, from 1.25 g / d to 1.75 g / d.
The polyamide (nylon 6.10) monofilament of the present invention, which has an elongation of 6.5% against a change in load and a thermal shrinkage of 8.0% in boiling water, is woven to prepare a 4-shaft satin woven fabric. Then, the woven fabric was heat-set to obtain Sample 3 which is an example of the present invention.

1 and 2 show the structure and shape of Sample 3, and Table 3
Shows the yarn density and the like.

On the other hand, using the same warp as the above-mentioned woven fabric, arranging and weaving a polyamide (nylon 6.10) monofilament ordinary yarn having the same yarn diameter as the weft, a woven fabric having a 4-shaft satin weave is formed, and the woven fabric is heat-fixed. Conventional Example 3 was obtained. 7 and 8 show the structure and shape of Conventional Example 3, and Table 3 shows the yarn density and the like.

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

[Note] 1. Sheet smoothness: beaten cardboard waste paper into raw material,
In touch-pin standard sheet test machine "basis weight 70g / m ²
A "equivalent" paper sheet was prepared, a smooth sheet was prepared according to a conventional method, and the smoothness of the surface of the paper in contact with the fabric surface was measured with a Beck smoother.

2. Abrasion resistance volume of running surface: value calculated from the warp and weft volumes from the cross section of the fabric to 50% of the warp cross section on the running surface 3. Ear curl amount: Endless woven fabric The roll was stretched at a tension of 12 kg / cm, and the height change from the horizontal portion of the fabric to the edge of the fabric when wet with water was measured.

4. Ratio of life number Abrasion tester (registered utility model No. 1350124) manufactured by Nippon Filcon Co., Ltd. was used, and heavy calcium carbonate was used as a filler.

[Effects] As is clear from the above examples, the woven fabric of the present invention has better smoothness of the woven fabric surface than the conventional example, has excellent running properties without ear curls, and has a running surface abrasion resistance volume. The service life number has been significantly increased due to the increase in

[Brief description of the drawings]

1 to 6 are a partial plan view and a cross-sectional view of a papermaking fabric according to the present invention, and are examples of the present invention. 7 to 10 are a partial plan view and a cross-sectional view of a conventional papermaking fabric. 1 to 17 warp 1 'to 17' weft 1 "to 17" lower weft

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI D21F 7/08 D21F 7/08 A (56) References JP-A-54-125705 (JP, A) JP-A-52-124906 ( JP, A) JP-T-63-502291 (JP, A) JP-T-43-24546 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D03D 1/00-15/00 D21F 1/10 D21F 7/08

Claims (13)

(57) [Claims] 1. An extensibility for an endless woven fabric having an elongation of 6% or more with respect to a load change of 1.25 g / d to 1.75 g / d and a heat shrinkage of 7% or more when immersed in boiling water. Heat-shrinkable polyamide monofilament. 2. A load of 1.25 g when applied at a speed of 2 mm / min.
An extensible heat-shrinkable polyamide monofilament for endless woven fabric, having an elongation of 6% or more with respect to a load change from / d to 1.75 g / d and a heat shrinkage of 7% or more when immersed in boiling water. 3. An endless woven fabric comprising the stretchable heat-shrinkable polyamide monofilament according to claim 1 arranged at least on a weft. 4. A wear-resistant papermaking woven fabric according to claim 1, wherein the stretchable heat-shrinkable polyamide monofilament is arranged on at least a weft yarn. 5. An abrasion-resistant papermaking woven fabric according to claim 2, wherein the stretchable heat-shrinkable polyamide monofilament is arranged at least on a weft. 6. An endless weft multiplex woven fabric in which the extensible heat-shrinkable polyamide monofilament according to any one of claims 1 to 2 is arranged on at least the weft of an endless weft multiplex woven fabric in which wefts are arranged in upper and lower multilayers. . 7. An endless endless wool comprising a stretchable heat-shrinkable polyamide monofilament as set forth in any one of claims 1 and 2 at least on a weft on a running surface of an endless weft multiplex woven fabric in which upper and lower multilayers are arranged. Woven multi-layer fabric. 8. An abrasion-resistant papermaking paper comprising the stretchable heat-shrinkable polyamide monofilament according to claim 1, wherein at least the weft of a multi-layer weft for papermaking in which the weft is arranged in multiple layers above and below a papermaking surface and a running surface. Weft multi-layer fabric. 9. An anti-shrinkable polyamide monofilament according to claim 1, wherein the stretchable heat-shrinkable polyamide monofilament according to claim 1 is arranged on at least the weft on the running surface of a papermaking weft multi-layer woven fabric in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. Abrasive weft multiple woven fabric for papermaking. 10. A papermaking weft multi-layered woven fabric in which wefts are arranged in multiple layers above and below a papermaking surface and a running surface.
2. A wear-resistant papermaking weft multiple woven fabric, comprising an extensible heat-shrinkable polyamide monofilament described in 1). 11. A papermaking weft multi-layer woven fabric in which wefts are arranged in multiple layers above and below a papermaking surface and a running surface, at least to the wefts on the running surface.
An abrasion-resistant papermaking weft multiplex woven fabric, comprising the stretchable heat-shrinkable polyamide monofilament according to claim 2. 12. A polyamide polyamide monofilament and / or polyester monofilament, wherein at least the weft of a woven multi-layered woven fabric for papermaking in which the weft is arranged in multiple layers above and below a papermaking surface and a running surface. Abrasion-resistant weft multi-layer woven fabric for papermaking, arranged in combination with the extensible heat-shrinkable polyamide monofilament described in 1). 13. A general polyamide monofilament and / or polyester monofilament at least on a running surface weft of a papermaking weft multi-layer woven fabric in which wefts are arranged in upper and lower multilayers on a papermaking surface and a running surface. Abrasion-resistant papermaking weft multi-layer woven fabric arranged in combination with the extensible heat-shrinkable polyamide monofilament described in the section.