JP2896899B2 - Stretchable heat-shrinkable polyester monofilament for endless fabric and endless fabric - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester monofilament for endless fabric and a wear-resistant endless fabric in which the filament is arranged, particularly a wear-resistant papermaking 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 the posture stability must be good because of contraction.

In addition, there is another problem that the abrasion resistance must be high because the abrasion is caused by contact with the drive roll, the 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 described below in addition to the above-mentioned performances.However, if the above points are described with respect to the papermaking fabrics, almost all problems common to endless fabrics and their solutions can be explained and understood. The present invention will be described using a papermaking fabric 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 (b), that is, the improvement of the wear resistance of the papermaking woven fabric, is not sufficiently devised, and the running side of the papermaking woven fabric is of a weft-wearing type, and only stops the weft 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.

In order to improve such abrasion resistance, the use of abrasion-resistant polyamide yarn has been attempted in the past, but this attempt does not change the structure of the woven fabric itself, but merely changes the material used. No epoch-making effect can be obtained merely by utilizing the properties. On the other hand, a 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 related art as described above, the present inventor has found that when a papermaking fabric is constructed, particularly excellent wear resistance,
Invented a special stretchable heat-shrinkable polyester monofilament that exerts the posture stability and surface smoothing effect, and by using this filament, improves the structure of the papermaking fabric and improves the abrasion resistance. It also improves papermaking performance such as water-based properties and wire mark properties of woven fabric.

[Means for Solving the Problems] The present invention relates to a method for producing plastic deformation in a load range of 1.0.5 g / d to 2.5 g / d, elongation at a yield point of 1 to 10%, and immersion in boiling water. An extensible heat-shrinkable polyester monofilament for endless woven fabric having a heat shrinkage of 7% or more.

2. 0.5 g / d to 2.5 g / d when a load is applied at a speed of 2 mm / min
Plastic deformation occurs within the range, and the elongation at this yield point is 1
~ 10%, and the heat shrinkage when immersed in boiling water is 7
% Or more, an extensible heat-shrinkable polyester monofilament for endless fabric.

3. A wear-resistant papermaking woven fabric comprising the stretchable heat-shrinkable polyester monofilament according to claim 1 disposed at least on a weft.

4. A wear-resistant papermaking woven fabric according to claim 2, wherein the stretchable heat-shrinkable polyester monofilament is arranged on at least a weft yarn.

5. An abrasion-resistant papermaking weft multiplex comprising a stretchable heat-shrinkable polyester monofilament according to claim 1, wherein 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.

6. A wear-resistant papermaking paper comprising the stretchable heat-shrinkable polyester monofilament according to claim 1, which is disposed on at least the running surface weft of a multi-layered weft for papermaking in which the weft is arranged in multiple layers above and below the papermaking surface and the running surface. Weft multi-layer fabric.

7. An abrasion-resistant papermaking weft multiplex comprising a stretchable heat-shrinkable polyester monofilament according to claim 2, wherein at least the weft of a papermaking weft multiplex woven fabric in which the weft is arranged in multiple layers above and below a papermaking surface and a running surface. fabric.

8. Abrasion resistance in which an extensible heat-shrinkable polyester monofilament according to claim 2 is arranged on at least the weft on the running surface 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. Weft multi-layer woven fabric for papermaking.

9. A normal polyester monofilament and / or a polyamide monofilament, as described in any one of claims 1 and 2, in at least the weft of the papermaking weft multiple woven fabric in which the weft is arranged in upper and lower multilayers on the papermaking surface and the running surface. An abrasion-resistant papermaking weft multi-layer woven fabric arranged in combination with an extensible heat-shrinkable polyester monofilament.

10. The ordinary polyester monofilament and / or polyamide monofilament, at least on the running surface weft of the papermaking weft multi-layer woven fabric in which the weft is arranged in multiple layers above and below the papermaking surface and the running surface, according to any one of claims 1 and 2. Abrasion-resistant papermaking weft multiple woven fabric arranged in combination with a stretchable heat-shrinkable polyester 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. The effect of the filament material itself is large, but the physical performance added by the treatment of the filament also has a large 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 polyester monofilament for papermaking fabric of the present invention has completely different properties from such conventionally used monofilaments. That is,
The stretchable heat-shrinkable polyester monofilament for papermaking fabric of the present invention is a very special filament having a yield point, plastically deforming, and having large heat shrinkability. That is,
The load range of 0.5 to 2.5 g per denier (0.5 g / d to 2.5 g
g / d) and has special properties such that the elongation at the yield point is 1 to 10% and the heat shrinkage when immersed in boiling water is 7% or more. It is a novel monofilament that has never been known before.

Preferably, the load is 0.5 g / min when applied at a speed of 2 mm / min.
plastic deformation occurs in the range of d to 2.5 g / d, the elongation at this yield point is 1 to 10%, and the heat shrinkage when immersed in boiling water is 7% or more. It is a heat-shrinkable polyester monofilament.

The special extensible heat-shrinkable polyester monofilament of the present invention, the degree of stretching and relaxation of the filament,
The filament can be manufactured by adjusting the treatment temperature and imparting the above-described extensibility and heat shrinkability to the filament. More specifically, the extensible heat-shrinkable polyester monofilament having the special physical properties of the present invention is, for example, after cooling and solidifying a filament extruded from a nozzle by a normal melt spinning method in a water bath, to 50 ° C to 90 ° C. 3.0-4.0 in warm water bath
It can be manufactured by stretching at twice the draw ratio and not performing the relaxation heat setting.

Such a special monofilament is, for example, a polyester monofilament taken directly from the second codet roll in the melt spinning of polyester, and the draw ratio is 3 to
3.5, and the requirement of the present invention that the elongation is 6% or more for a load change from 1.25 g / d to 1.75 g / d, and the heat shrinkage when immersed in boiling water is 7% or more. Is provided. The special stretchable heat-shrinkable polyester monofilament of the invention exhibits excellent woven fabric posture stability and surface smoothing effect. In addition, the papermaking fabric of the present invention uses the above-described special extensible heat-shrinkable polyester monofilament to improve the structure, so that the papermaking surface has good papermaking properties, and the water and wire mark properties have been 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 when used thickly for the weft, the abrasion resistance volume does not immediately increase by itself. 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, the fact that the warp is not bent is effective in keeping the posture without stretching even under the tension. 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 to carry out the process, invented an extensible heat-shrinkable polyester monofilament necessary for forming a papermaking fabric, and invented a papermaking fabric exhibiting excellent effects.

The filament for forming the papermaking fabric of the present invention, in which the weft is sufficiently bent and the whole is fixed integrally, is 0.5 g.
plastic deformation occurs at a load range of / g to 2.5 g / d, the elongation at this yield point is 1 to 10%, and the heat shrinkage when immersed in boiling water is 7% or more. It is a polyester monofilament.

As described above, this filament is a novel filament that is completely unknown before the present application, and a normal filament without a yield point gently and continuously elastically deforms when a load is applied, and a specific load is applied. In contrast, the filament for papermaking woven fabric of the present invention has the above-mentioned specific yield point, and the weaving force of the loom applied to the weft during weaving (the load at the yield point). (Comparable to), plastically deforms, intersects with the warp, and does not return to its original position when it leaves the loom. The filament having no yield point does not bend sufficiently by the weaving force of the loom at the time of weaving, and is only elastically deformed.

What is important here is that the extensible heat-shrinkable polyester monofilament of the present invention undergoes plastic deformation at the yield point, and unlike elastic deformation, 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 is stable in a state in which the weft is sufficiently bent at the weaving stage, and a woven fabric excellent in posture stability and surface smoothness can be formed.

And since the heat-shrinkable polyester monofilament of the present invention has extremely high heat-shrinkability as described above, it greatly shrinks (shrinks) in the heat-setting step after weaving,
The weft has a sufficiently bent shape, and the warp is firmly gripped and heat-fixed, so that the posture stability of the fabric is extremely good. Furthermore, since the weft greatly shrinks in a state of being sufficiently bent at the time of weaving, the crimp of the weft becomes rectangular in longitudinal section between the warps and the effective abrasion resistance volume becomes very large. This characteristic filament has high abrasion resistance when disposed on the weft on the running surface of the papermaking fabric, but has a smooth surface and improves paper quality when disposed on the papermaking surface. The papermaking fabric of the present invention includes a so-called single-woven fabric in which stretchable heat-shrinkable polyester monofilament wefts are arranged in a single layer, and a weft-multiple papermaking fabric in which the wefts are arranged in multiple layers. The extensible heat-shrinkable weft polyester monofilament 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 in a range that does not impair the special effects of the extensible heat-shrinkable polyester monofilament of the present invention.

In addition, the extensible heat-shrinkable weft polyester monofilament of the present invention can be arranged on a warp or both. Again, of the present invention, having a yield point,
An extensible heat-shrinkable polyester monofilament that is plastically deformed at the yield point and has extremely high heat shrinkability is a novel filament that has never been known before the present application, and the use of this filament provides a special effect of the present invention. Papermaking fabrics are also novel fabrics that are completely unknown.

The elongation at the yield point of the monofilament of the present invention is 1
10% and the heat shrinkage when immersed in boiling water must be at least 7%. In the case of a yarn having an elongation of 10% or more at the yield point, there is a problem that the yarn stretches on a weaving loom during weaving, and the weft does not come out of a bobbin or a pipe. Further, since a yarn having an elongation of 1% or less does not undergo plastic deformation, a sufficiently bent woven fabric of a weft cannot be formed. Further, the heat shrinkage rate is 7
% Or less of the monofilament has low heat shrinkability, and good posture stability cannot be obtained even when heat-fixed. By the way, looking at the polyester monofilaments of conventionally known papermaking woven fabrics, the elongation under a load of 1 g / d is large and 2.
Although there is about 5%, there is no yield point, there is no plastic deformation, and the heat shrinkage is only about 0.5 to 2.5% when immersed in boiling water.

[Actions] The actions and features of the present invention will be described in the following with respect to a stretchable heat-shrinkable polyester monofilament and a papermaking fabric.

The extensible heat-shrinkable polyester monofilament of the present invention also has the effect of not shrinking in width when it is externally woven having the above-mentioned properties having plastic deformability and heat shrinkability.

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, since the stretchable heat-shrinkable polyester monofilament of the present invention is a flexible yarn, it can be sufficiently bent and plastically deformed in the state by the force applied during weaving (corresponding to the yield value). Therefore, the width of the fabric is not reduced, and the posture is stabilized. 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 extensible heat-shrinkable polyester 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 running surface and the formed weft yarn. 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 is conceivable to arrange a weft with a large wire diameter on this weft. The wear 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. But, in fact, by itself,
The present inventor's research has revealed that the abrasion resistance volume does not always increase.

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 special stretchable heat-shrinkable polyester monofilament is arranged on the weft on the running surface so that the weft is sufficiently bent and protruded between the warps, thereby increasing the crimp of the weft. At the same time, taking advantage of the property of large heat shrinkage, the weft is greatly shrunk in the heat setting process and the crimp shape of the weft formed between the warps is made into a rectangular shape in longitudinal cross section, three-dimensionally cylindrical, and the abrasion resistance of the weft is made. That is, the portion that does not work is reduced, and the effective wear resistance volume is significantly increased.

Another feature of the present invention is that a special extensible heat-shrinkable polyester monofilament is arranged on the weft so that the weft is sufficiently bent at the knuckle portion where the warp weft intersects, and in that state the weft deforms to grip the warp and heat the warp. The knuckle portion is fixed for fixing, and the posture stability is extremely improved.

Another feature of the present invention is that a special extensible heat-shrinkable yarn is arranged on the weft on the running surface, so that the weft is sufficiently bent at the knuckle portion and the weft is deformed in that state to grip the weft, 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. further,
That is, the adhesiveness to the guide roll is good and the guideability is good. The effect of improving the guide property is an important effect common to endless fabrics.

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 woven fabrics, the upper layer weft uses relatively hard yarns to reduce the bend and make the crimp the same height as the warp in order to smooth the surface of the woven fabric. I have. Therefore, the upper layer weft has a large heat shrinkage. On the other hand, the lower layer weft is formed with a crimp which is sufficiently long 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 setting finish, the upper layer weft has a large heat shrinkage, so a force to shrink in the width direction acts on the upper layer 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 layer weft, the crimping property is good and the shrinkage is large, so that the force of shrinking in the width direction is equal to or more than that of the upper layer, so that the curl occurs on the ear of the fabric do not do. 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 polyester monofilament of the present invention is extremely effectively exhibited, since wefts 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 fabric of the present invention is woven by shrinking the special extensible heat-shrinkable polyester monofilament into the weft as described above, but by performing heat fixing finishing after weaving, the shrink weft is strongly fixed. 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. The weft 5 'has a specific yield point and is a heat-shrinkable polyester monofilament having a large heat shrinkage, which is plastically deformed. A crimp is formed on the lower surface of the base member so as to protrude greatly, and this crimp has a wear effect. It is understood that the weft is bent sufficiently and fixed, that the warp is strongly grasped, and that the warp is not exposed on the surface of the running surface. Due to the plastic deformation effect and the heat shrinkage effect, the weft 5 'is bent almost vertically on both sides of the warp yarns 1, 5, and 9, and the crimp of the weft becomes a vertical rectangular section, and a three-dimensional cylinder, which is understood from the rectangular vertical section. As can be seen, the wear-resistant volume is maximized. Then, it can be seen that the lower surface shape of the crimp becomes flat and the running surface becomes 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 polyester monofilament of the present invention is disposed as the lower weft, while the ordinary polyester monofilament is disposed as the upper weft. The lower layer weft 14 "is woven by warps 1, 9, and 17, and the warps 2 to 8 and 10 to
It can be seen that a crimp for seven warps has been formed passing below 16. 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. Weft yarn due to plastic deformation effect and heat shrinkage effect
At 14 ", the crimp of the weft is bent almost vertically on both sides of the warp yarns 1, 9, and 17, and the crimp of the weft is rectangular in a vertical cross section, and is three-dimensionally cylindrical. It can be seen that the lower surface of the crimp is flat and the running surface is smoother, whereas the upper weft 14 'is a normal polyester monofilament, so the crimp has a circular arc shape and a rectangular cross section unlike the lower weft. Also, the upper surface of the crimp does not become flat and the fabric surface does not become smooth.

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 portion 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 line. The woven fabric of this embodiment is a woven fabric having the same weave structure as the woven fabric of FIG. 3, but has a different upper weft, and thus has a different surface structure. In this embodiment, both the upper and lower wefts have the specific yield point of the present invention and undergo plastic deformation. Large heat shrinkage,
An extensible heat-shrinkable polyester monofilament is arranged. The lower weft 14 "is woven into the structure by warps 1, 9, and 17 and passes under the warps 2 to 8 and 10 to 16 and the warp 7
It can be seen that the crimps for the main body are formed. In this crimp, the lower weft 14 "is sufficiently bent during weaving and plastically deforms, and further strongly shrinks in the heat setting step, so that it protrudes greatly from the lower surface between the warps 1 and 5, and has a longitudinal cross-sectional rectangular shape. The crimp has a wear 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 plastic deformation effect and the heat shrinkage effect, the weft 14 ″ is bent almost vertically on both sides of the warps 1, 9, and 17, and the crimp of the weft is rectangular in longitudinal section and three-dimensionally cylindrical, as understood from this shape. It can be seen that the abrasion-resistant volume is maximized, and that the lower surface of the crimp is flat and the running surface is smoother, while the upper weft 14 ″ is woven into the structure by the warps 2 and 5 and is over the warps 3 and 4. A crimp that projects through the lower surface of two warps is formed, and similarly, a crimp that projects between the warps 10 and 13 on the lower surface of two warps is formed. In addition, a crimp is formed between the warps 5 and 10 so as to pass over the warps 6, 7, 8, and 9 and protrude greatly from the upper surface of four warps. Since the upper weft 14 "is also the extensible heat-shrinkable polyester monofilament of the present invention, its crimp shape becomes rectangular in longitudinal section due to the plastic deformation effect and the heat shrinkage effect similarly to 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 it is not possible, there is no accumulation of pulp and no pulp mat is formed, so that 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 only elastically deformed without plastic deformation and has only a small heat shrinkage, so it forms a crimp that protrudes in an arc shape downward by performing gradual deformation, like the crimp of the papermaking fabric of the present invention, A crimp having a rectangular vertical section cannot be formed on both sides of the warp woven by the weft and bent substantially vertically. 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 vertical section. The wear volume is much smaller.

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, it is not plastically deformed but is elastically deformed and has only a small heat shrinkage, so that it forms a crimp that protrudes in an arc shape downwardly and gently deforms, similar to the conventional example of FIG. In addition, a crimp having a rectangular longitudinal section as in the papermaking fabric of the present invention cannot be formed.

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 weft 14 'is also a normal polyester monofilament like the lower weft 14 ", so unlike the monofilament of the present invention, it is only elastically deformed without plastic deformation and has only a small heat shrinkage, so it has a gradual deformation. To form a crimp that protrudes upward in an arc shape, and cannot form a crimp having a rectangular longitudinal section, like the crimp of the double woven fabric for papermaking of the present invention. It can be seen that the fabric surface is not smooth.

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 fabric which is the endless fabric required to have the strictest performance, but the endless fabric in which the extensible heat-shrinkable polyester monofilament of the present invention is arranged as described above. 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 papermaking fabric is shown.

Effect comparison test Example 1 A normal polyester monofilament with a wire diameter of 0.17 mm was melted in the warp, and the upper weft was plastically deformed under a load of 1.1 g / d with a wire diameter of 0.17 mm. The elongation at the yield point was 3.2%, and the boiling water The polyester monofilament of the present invention having a heat shrinkage of 10% in the lower weft, a wire diameter of 0.22 mm,
The polyester monofilament of the present invention, which undergoes plastic deformation under a load of 1.2 g / d and has an elongation at this yield point of 4.0% and a heat shrinkage in boiling water of 13%, and a polyamide monofilament (nylon 6) having a wire diameter of 0.22 mm 5) A woven fabric having an eight-shaft weft double structure shown in FIGS. 5 and 6 in which normal yarns are alternately woven is prepared. Sample 1 which is an example of the present invention was obtained.

 Table 1 shows performance such as yarn density.

On the other hand, using the same warp as the above-mentioned woven fabric, the upper weft is woven by alternately arranging a polyester monofilament ordinary yarn having the same diameter as the upper weft, and a polyester monofilament ordinary yarn and a polyamide (nylon 6) monofilament ordinary yarn having the same diameter as the lower weft. , An 8-shaft weft double-textile fabric was prepared, and this fabric was heat-set to obtain Conventional Example 1. 9 and 10 show the structure and shape of Conventional Example 1, and Table 1 shows performance such as yarn density. Table 1 shows the test results for the 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 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. Example 2 Polyester monofilament ordinary yarn with a wire diameter of 0.10 mm is used for the upper weft and 0.20 mm polyester monofilament for the upper weft. And the lower weft with a wire diameter of 0.22 mm
Plastic deformation occurs at 1.2 g / d and the elongation at this yield point is 4.
Polyester monofilaments having a heat shrinkage rate of 13% in boiling water at 0% are arranged and woven to form an 8-shaft weft double structure woven fabric shown in FIG. 3 and FIG.
The woven fabric was heat-fixed to obtain a sample 2 having a yarn density shown in Table 2, which is an example of the present invention.

 Table 2 shows performance such as yarn density.

On the other hand, using the same warp and upper weft as the above-mentioned woven fabric, a polyester monofilament normal yarn having the same yarn diameter is arranged and woven on the lower weft to create an 8-shaft weft double structure woven fabric, and heat-fixing this woven fabric. Conventional Example 2 was obtained. 9 and 10 show the structure and shape of Conventional Example 2, and Table 2 shows the performance such as yarn density.

 Table 2 shows the test results for the 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 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. Life time ratio Abrasion tester manufactured by Nippon Filcon Co., Ltd. (Registered Utility Model No. 1350124) Example 3 Using a polyester monofilament ordinary yarn with a wire diameter of 0.25 mm for the warp, a wire diameter of 0.30 mm for the weft, and a load of 1.7 g / The polyester monofilament of the present invention, which is plastically deformed at d and has an elongation at the yield point of 2.3% and a heat shrinkage in boiling water of 17%, is woven by placing it, as shown in FIGS. 1 and 2. A woven fabric having a 4-shaft weave structure was prepared, and the woven fabric was heat-set to obtain a sample 3 having a thread density shown in Table 3 which is an example of the present invention.

 Table 3 shows performance such as yarn density.

On the other hand, using the same warp as the above-mentioned woven fabric and arranging and weaving a polyester monofilament normal yarn having the same yarn diameter as the weft, a woven fabric having a 4-shaft satin woven structure is prepared, and this woven fabric is heat-fixed to obtain Conventional Example 3. Was. 7 and 8 show the structure and shape of Conventional Example 3, and Table 3 shows performance such as yarn density.

 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. Lifetime ratio Abrasion tester (registered utility model No. 1350124) manufactured by Nippon Filcon Co., Ltd. [Effect] As is clear from the above examples, the woven fabric of the present invention has a higher sheet smoothness (= (Smoothness of woven fabric surface) and excellent runnability without ear curl, and a remarkable increase in the number of service lives due to an increase in abrasion volume with respect to the running surface.

[Brief description of the drawings]

FIGS. 1, 3, and 5 are front views showing a woven fabric according to an embodiment of the present invention, and FIGS.
FIG. 6 is a sectional view of the woven fabric of FIGS. 3, 3 and 5; 7 and 9 are front views showing a conventional fabric, and FIGS. 8 and 10 are sectional views of the fabric of FIGS. 7 and 9, respectively. 1 to 17 warp 1 'to 17' upper weft 1 "to 17" lower weft

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI D21F 1/10 D21F 1/10 7/08 7/08 A (56) References JP-A-60-88120 (JP, A) 60-199914 (JP, A) JP44-32002 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D01F 6/62 D03D 1/00-15/00 D21F 1/00-13/12

Claims (10)

(57) [Claims] 1. A plastic deformation occurs in a load range of 0.5 g / d to 2.5 g / d, the elongation at the yield point is 1 to 10%, and the thermal shrinkage when immersed in boiling water is 7%. The extensible heat-shrinkable polyester monofilament for endless fabrics as described above. 2. A load of 0.5 g / min when applied at a speed of 2 mm / min.
plastic deformation occurs in the range of d to 2.5 g / d, the elongation at this yield point is 1 to 10%, and the heat shrinkage when immersed in boiling water is 7% or more. Heat-shrinkable polyester monofilament. 3. A wear-resistant papermaking woven fabric according to claim 1, wherein the stretchable heat-shrinkable polyester monofilament is arranged at least on a weft. 4. An abrasion-resistant papermaking woven fabric according to claim 2, wherein the stretchable heat-shrinkable polyester monofilament is arranged at least on a weft. 5. An abrasion-resistant papermaking wherein the stretchable heat-shrinkable polyester monofilament according to claim 1 is arranged on 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. 6. An anti-shrinkable polyester monofilament according to claim 1, wherein the stretchable heat-shrinkable polyester monofilament according to claim 1 is arranged at least on the weft on the running surface of a woven multi-layered woven fabric for papermaking in which the wefts are arranged above and below the papermaking surface and the running surface in multiple layers. Abrasive weft multiple woven fabric for papermaking. 7. An abrasion-resistant papermaking wherein the stretchable heat-shrinkable polyester monofilament according to claim 2 is arranged on 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. 8. The stretchable heat-shrinkable polyester monofilament according to claim 2, wherein at least the weft on the running surface of 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. Abrasion resistant weft multiple woven fabric for papermaking. 9. The method according to claim 1, wherein at least the weft of the multi-layer woven fabric for papermaking, in which the weft is arranged in multiple layers above and below the papermaking surface and the running surface, a normal polyester monofilament and / or a polyamide monofilament. An abrasion-resistant papermaking weft multiple woven fabric arranged in combination with the described extensible heat-shrinkable polyester monofilament. 10. A polyester monofilament and / or a polyamide monofilament according to claim 1 or 2, wherein at least the running surface weft of the multi-layer woven fabric for papermaking, in which the wefts are arranged in multiple layers above and below the papermaking surface and the running surface. An abrasion-resistant papermaking weft multi-layer woven fabric, which is arranged in combination with the extensible heat-shrinkable polyester monofilament described in the section.