JP3194865B2 - Industrial spiral belt and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial spiral belt and a method for producing the same, and more particularly, to an industrial spiral belt suitable for a filter canvas of a papermaking dryer canvas and a belt press dewatering machine, and a method for producing the same.

[0002]

2. Description of the Related Art It is generally known to use a spiral belt in which spiral coils made of synthetic resin are arranged in parallel and meshed with each other, and a core wire is inserted into a common hole formed by the meshing for industrial use. For example, use in a papermaking spiral canvas used in a dry part of a paper machine is disclosed in West German Patent Publication No. 2419751.

[0003] The reason why the spiral canvas is used in the dry part of a paper machine is that it has a structurally high strength, high air permeability, good surface smoothness, and does not particularly require a joint. . Specifically, the spiral canvas 1
As shown in FIGS. 10 and 11, spiral coils 2 are alternately arranged in a right-handed manner and a left-handed one by one in parallel and engaged with each other, and the core wire 3 is inserted into a common hole formed by the engagement.
It is endless with the required length in the canvas running direction. The main function of the papermaking dryer canvas is to keep the wet paper in contact with the heating surface of the dryer cylinder, thereby increasing the heat transfer efficiency and improving the flatness of the paper.

[0004] Here, the air permeability of the dryer canvas greatly affects the drying efficiency and running stability of the wet paper, and an optimum air permeability for the type of paper is required in accordance with the wet paper drying process.
Therefore, it is necessary to adjust the air permeability of the dryer canvas so that the air permeability becomes optimal according to the type of paper. In general, a spiral canvas has a high air permeability due to its structure, and various methods described below have been proposed for adjusting the air permeability. (1) A tape-shaped strip or thread inserted into the hollow part of a spiral coil.

[0005] One or a plurality of tape-shaped strips such as a metal-coated resin film having a width of about 3 mm are arranged in a hollow portion of a spiral coil [Japanese Patent Application Laid-Open No. S57-1].
No. 16950]. A permeability adjusting member having a metal wire as a core material in a hollow portion of the spiral coil, for example, a plurality of metal wires are twisted, and a permeability adjusting member in which a fibrous material is twisted in a brush shape in the twisted portion is inserted. Thing
No. 65399]. A coil in which a crimped or wavy filament is inserted into a hollow portion of a spiral coil [US Pat. No. 4,362,776]. A spiral coil in which a hollow thermoplastic monofilament is inserted into the hollow part [Tokuhei Hei 7-50]
No. 0152]. A coil having various shapes inserted into the hollow portion of a spiral coil [US Pat.
No. 2]. An elastic yarn having various shapes inserted into a hollow portion of a spiral coil [British Patent No. 2216914]
issue〕. (2) Spiral coil in which resin is applied to the hollow part or bubble layer is formed.

[0006] Synthetic resin is applied in a number of strips in the longitudinal direction to close the gap [Japanese Patent Laid-Open No. 60-94689].
issue〕. A spiral coil in which a flexible bubble layer made of elastic bubbles is formed in the hollow portion [Japanese Patent Laid-Open No.
155444]. (3) Adjust the air permeability by changing the shape of the core wire.

[0007] A core wire having various shapes to obtain a low air permeability (Japanese Patent Application Laid-Open No. 61-186596). A core wire having various shapes to obtain low air permeability [US Pat.
No. 8, 448079]. A material in which the core component of the core wire is made of polyester and the sheath component is made of a low-melting point resin, and the sheath component is softened by heating and filled in the gap between the coil to lower the air permeability (US Pat. No. 4,500,590). The one in which the shape of the core wire is non-circular so that the air permeability can be adjusted [US Pat. No. 5,115,582].

[0008]

[Problems to be solved by the invention]
Each of the methods for adjusting the air permeability disclosed in (1), (2), and (3) to (4) can adjust the air permeability to some extent, but each has the following problems.

Regarding (1), when weaving the canvas, it is difficult to arrange the tape-shaped strip at a predetermined position in the hollow portion of the spiral coil, and the working efficiency is poor, which is not practical. Then, it is difficult and troublesome to manufacture the air permeability adjusting member. Then, the operation of inserting a crimped or corrugated filament into the hollow portion of the spiral coil is inefficient and impractical. In this case, since the air permeability is determined by the degree of deformation of the hollow thermoplastic single fiber, it is difficult to obtain a predetermined air permeability. Then, since the shape of the yarn is deformed by heat setting, the degree of deformation varies depending on the material of the yarn, heat setting conditions, and the like, so that it is difficult to obtain a product with a constant air permeability.
In such a case, it is necessary to produce a thread-shaped elastic thread corresponding to a predetermined air permeability, so that the production of the thread is troublesome.

In (2), it is difficult to apply the resin uniformly, so that it is difficult to obtain a uniform air permeability over the entire canvas. In this case, an operation process for forming a flexible bubble layer is required, and it is difficult to obtain a predetermined air permeability.

Regarding (3), when changing the shape of the core wire in (1), it is necessary to make the core wire insertion portion large in order to lower the air permeability, which makes it difficult for the spiral belt to be smoothly bent. In practice, it is difficult to significantly adjust the air permeability.

To solve these problems, for example, there is a method disclosed in European Patent Publication No. 128496A2.

The spiral canvas 4 is shown in FIGS.
As shown in FIG. 3, in a hollow portion 6 (open space) of the spiral coil 5, a wedge-shaped gap 8 (crevass space) is formed between adjacent spiral coils 5 connected by a core wire 7. This European Patent Publication 128
In the method disclosed in No. 496A2, in order to further reduce the air permeability of the spiral canvas 4, not only the hollow portion 6 of the spiral coil 5 is filled with a filler such as a monofilament, but also the wedge-shaped gap 8 described above efficiently fills the filler. In order to fill the gaps, a thread 9 having a trapezoidal cross section wider on the paper contact surface side than the paper contact surface side is used, and both end edges (trapezoidal edge portions) on the paper contact surface side are inserted into the wedge-shaped gap 8.

[0014] In this European Patent Publication No. 128496A2, although the specific size and dimensional ratio of the thread 9 inserted into the hollow portion 6 of the spiral coil 5 is not disclosed, the spiral canvas 5 In order to reduce the air permeability, it is necessary to make both edges on the paper contact surface side enter the deep portion of the wedge-shaped gap 8. However, in the yarn 9 disclosed in European Patent Publication No. 128496A2, it is difficult to form an acute angle due to the limitation of the angle of both end edges on the paper contact surface side, and the occupancy of the wedge-shaped gap 8 is also limited. ,
Therefore, there is naturally a limit in reducing the air permeability.

By the way, sewage sludge, and as those used in the dehydration such as urine sludge or industrial wastewater sludge, there is a belt press dewatering machine such as shown in FIG. 14. Since the dehydrator has a simple structure and easy operation management, it is often used in place of a vacuum dehydrator or a pressure dehydrator, and its schematic configuration is as follows.

The two filter belts 11, 12 are stretched around a plurality of rollers 13, and the filter belts 11, 12 are driven while applying a predetermined tension. Gravity dehydration as a first stage is performed in a gravity section 14 where sludge to which a polymer flocculant or the like is added is supplied onto a filter belt 12,
In the second stage, the two filter belts 11 and 12 are superposed in a wedge shape and dewatering is promoted by shearing force and pressing force acting on sludge while running between rollers 13 in an S-shape.
The dewatered cake is discharged at the return section 15 of the filter belts 11 and 12. The filter belts 11 and 12 are generally made of polyester monofilaments having a diameter of 0.2 to 1.0 mm and woven into a single weave of plain weave, twill weave and satin weave as warp and weft.

[0017] In recent years, if reduce the weight and volume of dehydration cake, you can reduce the energy required for transportation expenses and incineration
Therefore, in the belt press dewatering machine, the filter
Increase belt tension or pressurized belt (not shown)
Or the like, the water content of the dewatered cake is reduced. However, when the tension of the filter belt is increased, the strong load on the filter belt increases accordingly, and if there is a variation in the supply of sludge, wrinkles are likely to be generated on the filter belt. Especially in the case of sludge dewatering of papermaking wastewater that discharges hard and thick dewatered cakes with a lot of fibrous material, the filter belt cannot be processed unless the filter belt is high in strength. Wrinkles were generated due to variations in the supply, and the joint part where the filter belt was joined endlessly was easily broken due to bending fatigue.

To solve this problem, the spiral coil is arranged in parallel and meshed, and a linear connecting member is inserted into a common hole formed by the meshing and connected to form a belt press. A pressure belt (filter belt) for a dehydrator has been proposed (for example, Japanese Patent Publication No. 61-23079). The filter belt needs to be adjusted to the optimum air permeability for the target sludge in accordance with the dewatering conditions and sludge properties as a scale for considering the dewatering property of the belt press dewatering machine.

In order to adjust the air permeability of the filter belt, spiral coils are arranged in parallel and meshed with each other, and a joining core wire is inserted into a common hole formed by the meshing to form a flat belt. There is a method of inserting one or a plurality of synthetic resin monofilaments into a hollow portion of a spiral coil to adjust the air permeability (Japanese Utility Model Laid-Open No. 5-95615).

In this filter belt, an arbitrary air permeability can be obtained by inserting one or a plurality of monofilaments into the hollow portion of the spiral coil, and the range can be adjusted to 1000 to 30,000 cc / min. / Cm ² . Is indicated. However, in order to reduce the air permeability, it is necessary to insert a large number of monofilaments into the hollow part.If the filter belt is bent by rollers or the like during running in a belt press dewatering machine, the aforementioned monofilaments become flexible. However, it is conceivable that the bending is not performed smoothly. Therefore, there is a problem that it is difficult to insert a large number of monofilaments in order to obtain a low air permeability.

Accordingly, the present invention has been proposed in view of the above problems, and an object of the present invention is to provide an industrial spiral belt having good flexibility and a wide range of air permeability adjustment.

[0022]

SUMMARY OF THE INVENTION As a technical means for achieving the above object, the present invention relates to a method in which spiral coils made of synthetic resin are meshed in parallel, and a core wire is inserted into a common hole formed by the meshing. In an industrial spiral belt in which a monofilament for air permeability adjustment is inserted into a hollow portion of the spiral coil, the monofilament has two sides substantially parallel to the spiral coil in a belt thickness direction, and It has a cross-sectional shape in which either side extends in the belt length direction in parallel with the spiral coil, and enters the wedge-shaped gap located at both inner corners of the hollow portion at both ends of the one side. It is characterized by projecting a thin part.

The air permeability adjusting monofilament is a monofilament having a high heat shrinkage rate, and can be subjected to heat processing after insertion into the hollow portion of the spiral coil to fill a gap on at least one surface of the spiral coil. It is desirable that

Further, according to the present invention, an industrial spiral belt is used as a base fabric, and a web is laminated on one or both sides thereof for needling, or a thin portion is extended in the belt length direction in parallel with the spiral coil. It is possible to use an industrial spiral belt having one protruding side on the paper contact side as a papermaking dryer canvas or a filter belt for a belt press dewatering machine.

Further, in the method of the present invention, spiral coils made of synthetic resin are meshed in parallel, a core wire is inserted into a common hole formed by the meshing, and air permeability is adjusted in a hollow portion of the spiral coil. In the method for manufacturing an industrial spiral belt in which a monofilament is inserted, the monofilament has two sides that are substantially parallel to the spiral coil in the belt thickness direction, and one of the two sides is parallel to the spiral coil. A high heat shrinkage monofilament having a cross-sectional shape extended in the belt length direction, and having thin portions projecting into wedge-shaped gaps located at both inner corners of the hollow portion at both end portions of the one side. After the insertion of the monofilament,
It is characterized in that thermal processing is performed by applying a tension of 1 to 5 kg / cm in the running direction under hot air at a temperature of 0 ° C. so as to fill gaps on at least one surface of the spiral coil.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION The applicant of the present invention has examined the shape, performance and material of a thread for adjusting the air permeability by inserting it into the hollow part of a spiral coil, and has considered the use of an industrial spiral belt. Then, a monofilament is optimal from the viewpoints of antifouling property, strength and ease of production. An embodiment of the present invention is to obtain a spiral belt that can be adjusted to have low air permeability by using the monofilament.

The present applicant has studied the shape of this monofilament from the following viewpoints. The air permeability can be adjusted over a wide range, it can be easily inserted into the hollow part of the spiral coil, and the dimensions of the hollow part of the spiral coil are not always uniform and fluctuate. Fill with as little gap as possible to obtain low air permeability,
The belt can be bent smoothly, and monofilament can be easily manufactured.

As a result, it was found that the shape of the monofilament should be one satisfying the following conditions. It may be thin because it only needs to fill the hollow part of the spiral coil. When used in a papermaking dryer canvas, the contact surface side should have a large contact area with the wet paper in consideration of the drying efficiency of the wet paper.

From the above, the cross-sectional shape of the monofilament is not a normal circular shape or a flat shape, but the optimum shape is to adjust the dimension in the belt running direction to be inserted into the hollow portion of the spiral coil. It is sufficient to increase the dimension in the belt running direction in one of the belt thickness directions in order to fill the hollow part of the spiral coil in order to fill the hollow part of the spiral coil. is there. In consideration of the time when the belt is bent, if the size in the belt running direction is increased in both the belt thickness direction, the bending cannot be performed smoothly. Therefore, it is only necessary to increase the size in the belt running direction in only one of the belt thickness directions.

When the spiral belt is used as a papermaking dryer canvas, the shape of the above-mentioned monofilament is considered in consideration of the drying efficiency of wet paper.
Enlarge the dimension in the belt running direction on the paper contact side,
Both end portions on the paper contact side are thinned.

Next, when examining the characteristics that the monofilament should have, it is found that there is a dimensional variation in the hollow portion of the spiral coil, and that the monofilament having a size slightly smaller than the hollow portion is inserted and then heat processed (heat set). From the viewpoint, it is optimal to use a coil having a high heat shrinkage so that the hollow portion of the spiral coil can be filled by thermal processing. That is, the monofilament shrinks in the longitudinal direction due to the thermal processing, so that the cross-sectional area of the monofilament increases as a result, and the hollow portion of the spiral coil decreases as compared to before the thermal processing. Will be obtained.

Here, the above-mentioned thermal processing is generally a processing method for stabilizing the dimensions or fixing the shape of the fibers by heat treatment, and the processing conditions vary depending on the use, the use conditions, the material, and the like. However, it is usually processed under a predetermined tension at a predetermined temperature and for a predetermined time. In the case of the monofilament of the present invention, for example, it is desirable to heat-process under a hot air of 160 ° C. to 180 ° C. while applying a tension of 1 to 5 kg / cm in a belt running direction.

Therefore, a monofilament having a high heat shrinkage rate is used for adjusting the air permeability in the spiral belt,
After the cross-sectional shape of the monofilament is inserted into the hollow portion of the spiral coil, the dimension of the spiral coil in the belt running direction is increased in one of the belt thickness directions by thermal processing, and at least the hollow portion in the belt thickness direction is formed. It is assumed that the gap on one side can be filled.

The material of the monofilament may be appropriately selected depending on the intended use. For example, when a spiral belt is used as a papermaking dryer canvas and a filter belt for a belt press dehydrator, particularly,
It is desirable to use polyester monofilaments. In addition, the material and characteristics of the spiral coil need not be particularly limited, and may be appropriately selected depending on the application.
The shape is not limited to a circular, elliptical, or flat cross section. Further, the material and characteristics of the core wire need not be particularly limited, and may be appropriately selected depending on the application. The shape of the core wire is not limited to a circle, an ellipse, a flat shape, a hexagon, or the like.

The monofilament of the present invention has a cross-sectional shape that penetrates deeper into the wedge-shaped gap in the hollow portion of the spiral coil than the polyester monofilament having a trapezoidal cross-section disclosed in European Patent Publication No. 128496A2. Thereby, the air permeability of the spiral belt is adjusted, and a spiral belt having a low air permeability is realized by using a monofilament having a high heat shrinkage. In the present invention, the air permeability can be adjusted over a wide range by variously combining the size of the hollow portion of the spiral coil and the size of the monofilament, and in particular, a product with a low air permeability that cannot be obtained with the conventional product is obtained. .

[0036]

Next, a specific embodiment will be described below with reference to the drawings.

FIG. 1 shows a spiral canvas 20 in which the spiral belt of the present invention is applied to a papermaking dryer canvas.
Shown in The spiral canvas 20 meshes spiral coils 21 in parallel, inserts a core wire 23 into a common hole 22 formed by the meshing, and passes through a hollow portion 24 of the spiral coil 21 as described in detail below. Monofilament 2 for adjusting air permeability having predetermined cross-sectional shape
5 is provided.

In this spiral canvas, the spiral coil 21 has a circular cross section and a diameter of 0.7 mm.
And has a shape having a width W = 7 mm and a height H = 4 mm as shown in FIG. The core wire 23 is made of a polyester monofilament having a circular cross section and a diameter of 1.0 mm.

Next, a plurality of spiral coils 21 shown in FIG. 2 are arranged in parallel in the canvas traveling direction and meshed, and a core wire 23 is inserted into a common hole 22 formed by the meshing as shown in FIG. A spiral canvas 20a was manufactured. At this time, the density of the core wire 23 is 4.9 wires / 2.
It was 54 cm. After stabilizing the spiral canvas 20a with a tension of 8 kg / cm in the canvas traveling direction, 1 kg / cm
Heat processing (heat setting) was performed under hot air at 120 ° C. with a tension of cm. As a result, as shown in FIG. 4, the width W ₁ of the hollow portion 24 of the spiral coil 20b after heat setting is obtained.
Is 3.42 mm and the air permeability at this time is 37000 cc
/Min./cm ² .

Then, as shown in FIG. 5, a monofilament 25 for adjusting the air permeability is inserted into the hollow portion 24 of the spiral coil 21. The air-filtration adjusting monofilament 25 has a cross-sectional shape having the dimensions shown in FIG. 6, that is, the dimension of the paper contact side surface 26 is made larger than the non-paper contact side surface 27 so that the paper contact side surface 26 A polyester monofilament having a thin portion 28 protruding at both ends in the canvas running direction was used. The air permeability at this time is 130
It was 00 cc / min. / Cm ² .

After stabilizing the spiral canvas 20b with a tension of 2 kg / cm in the canvas running direction, 0.8 kg / cm
While pressing with a linear pressure of 20 kg / cm at a tension of 18 cm
Thermal processing (heat set) was performed under hot air at 0 ° C. As a result, a 2.8mm width W ₂ of the hollow portion 24 of the spiral coil 21 after the heat-set, as shown in FIG. 7, the air permeability at this time in Fig. 1 as a 4000cc / min. / Cm ² The spiral canvas 20 shown was finally manufactured. The heat setting process after the insertion of the monofilament has a temperature of 1
At 20C to 180C, preferably 160C to 180C,
The tension may be set at 1 kg / cm to 5 kg / cm.

The monofilament 2 used in this example
5 has a dry heat shrinkage of 10% at 180 ° C. and 14% at 200 ° C.
Was used. The dry heat shrinkage is not limited to the above-mentioned value, and the dry heat shrinkage at 180 ° C. is 8 to 18%.
The degree is preferred. Usually, the dry heat shrinkage of a general polyester monofilament is 4 to 7% at 180 ° C and 200 ° C.
In contrast, in the case of the monofilament 25 used in the present invention, it is desirable to use one having a higher dry heat shrinkage than a general polyester monofilament.

As described above, in this embodiment, the air permeability after inserting the monofilament 25 for adjusting the air permeability is 13000 cc / min. / Cm ² , whereas the air permeability before inserting the monofilament is 37000 cc / min. min./cm ² . From this result, the monofilament 2 of this example was
5 alone reduces the air permeability to about 35%, and a spiral canvas with low air permeability is obtained. Further, the air permeability after inserting the monofilament 25 and heat setting is 4000 cc / min. / Cm ² , the air permeability is further reduced to about 11%, and a spiral canvas with a further low air permeability is obtained. As described above, by using the monofilament 25 having a high heat shrinkage, the air permeability can be increased by 130% by the heat setting process after the insertion of the monofilament.
From 30 cc / min. / Cm ² to 4000 cc / min. / Cm ^2, it is greatly reduced to about 30%. Comparative Example 1 A spiral canvas 30 shown in FIG. This spiral canvas 30 does not insert a monofilament for adjusting the air permeability, and the air permeability is 35,000 cc / min. / Cm.
^{Was 2} . The manufacturing process of the spiral canvas 30 is the same as that of the embodiment. Comparative Example 2 A spiral canvas 40 shown in FIG. The spiral canvas 40 is a monofilament 45 for adjusting air permeability.
Is inserted. As the air permeability adjusting monofilament 45, a polyester monofilament having a flat cross section of 2.4 mm in width and 0.75 mm in height was used, and the air permeability was 12000 cc / min. / Cm ² . The manufacturing process of the spiral canvas 40 is the same as that of the embodiment.

[0044]

[Table 1] Comparing the air permeability of the spiral canvas in the example and the comparative examples 1 and 2, it is found that the example is 4000 cc / min. /
cm ² , whereas Comparative Example 1 has 35,000 cc / min.
/ Cm ² , the air permeability decreases to about 11%, and Comparative Example 2
At 12000 cc / min. / Cm ² , the air permeability decreased to about 33%, and it is clear that the air permeability of the spiral canvas of the example was greatly reduced.

[0045]

According to the present invention, the air permeability can be adjusted in a wide range by variously combining the size of the hollow portion of the spiral coil with the cross-sectional dimension of the air permeability adjusting monofilament. As a result, a product having very low air permeability and good flexibility can be obtained. The spiral belt of the present invention is most suitable for a papermaking dryer canvas and a filter belt for a belt press dewatering machine, but is not limited to these and can be widely used as an industrial spiral belt, and has a great practical value.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a spiral belt of the present invention.

FIG. 2 is a view showing one spiral coil constituting the spiral belt of FIG. 1;

FIG. 3 is a cross-sectional view showing a state in which a plurality of spiral coils are arranged and engaged in parallel, and a core wire is inserted into a common hole formed by the engagement;

FIG. 4 is a sectional view showing a state after the spiral canvas of FIG. 3 is heat-set.

FIG. 5 is a sectional view showing a state in which a monofilament for adjusting air permeability is inserted into the spiral canvas of FIG. 4;

FIG. 6 is an enlarged sectional view showing a sectional shape of the air permeability adjusting monofilament of FIG. 5;

FIG. 7 is a sectional view showing a state after the spiral canvas of FIG. 5 is heat-set.

FIG. 8 is a sectional view showing a spiral canvas of Comparative Example 1 with respect to the example of the present invention.

FIG. 9 is a sectional view showing a spiral canvas of Comparative Example 2 with respect to the example of the present invention.

FIG. 10 is a partial plan view showing an example of a spiral belt in which spiral coils are arranged and engaged in parallel, and a core wire is inserted into a common hole formed by the engagement;

11 is a sectional view of FIG.

FIG. 12 is a perspective view of a spiral belt disclosed in European Patent Publication No. 128496A2.

FIG. 13 is a sectional view of the spiral belt of FIG.

FIG. 14 is a schematic configuration diagram showing a belt press dehydrator using a filter belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Spiral coil 22 Common hole 23 Core wire 24 Hollow part 25 Monofilament for air permeability adjustment 28 Thin part

Claims (9)

(57) [Claims] 1. A spiral coil made of synthetic resin is meshed in parallel, a core wire is inserted into a common hole formed by the meshing, and a monofilament for adjusting air permeability is inserted into a hollow portion of the spiral coil. In the industrial spiral belt, the monofilament has two sides facing the spiral coil substantially in parallel in the belt thickness direction, and one of the sides extends in the belt length direction parallel to the spiral coil. An industrial spiral belt having a cross-sectional shape, wherein thin portions that enter wedge-shaped gaps located at both inner corners of the hollow portion are protrudingly provided at both ends of the one side. 2. The industrial spiral belt according to claim 1, wherein the air permeability adjusting monofilament is a monofilament having a high heat shrinkage. 3. The industrial spiral belt according to claim 1, wherein the air permeability adjusting monofilament is capable of filling at least one surface of the spiral coil. 4. The monofilament for adjusting air permeability according to claim 1, which is a monofilament having a high heat shrinkage rate, and is heat-processed after being inserted into the hollow portion of the spiral coil to form a gap on at least one surface of the spiral coil. Industrial spiral belt characterized in that it can be embedded. 5. As base fabric industrial spiral belt according to claim 1, industrial spiral belt, characterized in that the needling stacked web on one side or both sides. 6. Industrial spiral belt which comprises using industrial spiral belt according as papermaking drier canvas in any of claims 1 to 5. 7. The industrial spiral belt according to claim 6, wherein one side of the thin spiral portion extending in the belt length direction in parallel with the spiral coil is set as a contact surface side of a papermaking dryer canvas. An industrial spiral belt. 8. Industrial spiral belt which comprises using industrial spiral belt according as a filter belt belt press dehydrator to claim 1. 9. A spiral coil made of synthetic resin is meshed in parallel, a core wire is inserted into a common hole formed by the meshing, and a monofilament for adjusting air permeability is inserted into a hollow portion of the spiral coil. In the method for manufacturing an industrial spiral belt, the monofilament has two sides that are substantially parallel to the spiral coil in a belt thickness direction, and any one of the two sides is parallel to the spiral coil in a belt length direction. A monofilament having a high heat shrinkage rate, having a cross-sectional shape extended, and having a thin portion projecting into wedge-shaped gaps located at both inner corners of the hollow portion at both end portions of the one side, and inserting the monofilament. Thereafter, the workpiece is subjected to thermal processing by applying a tension of 1 to 5 kg / cm in the running direction under hot air of 160 ° C. to 180 ° C. And the manufacturing method of an industrial spiral belt, characterized in that to fill the voids on one surface.