JPH10266017A - Electroconductive polyphenylene sulfide fiber, monofilament and fabric for industrial use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fiber such as a monofilament made of a polyphenylene sulfide excellent in electroconductivity and useful as a wire material for eliminating a static electricity, and a fabric for an industrial use such as a paper making dryer canvas, and provide a net conveyer for a heat adhesion process of a nonwoven fabric in a thermal bonding method, and a conveyer belt in a dryer or a heat treatment unit or a filter by using the fiber such as the monofilament. SOLUTION: This electroconductive polyphnylene sulfide fiber such as a monofilament (including a sheath core composite fiber) contains 96-85 pt.wt. polyphenylene sulfide and 4-15 pt.wt. electroconductive carbon black having >=300 ml/100 g DBP oil absorbing amount measured based on a method of ASTM-D2414-79, and has <109 Ω.cm specific resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber such as polyphenylene sulfide monofilament having excellent conductivity and useful as a wire for removing various static electricity, and a paper making dryer using the monofilament or other fiber at least in part. The present invention relates to industrial fabrics such as canvases, net conveyors for a thermal bonding nonwoven fabric heat bonding process, belts or filters for transport in dryers and heat treatment machines.

[0002]

2. Description of the Related Art Polyphenylene sulfide (hereinafter referred to as P
Fibers such as monofilaments made of PS) are excellent in heat resistance and chemical resistance. Therefore, paper dryer dryer canvas, net conveyor for thermal bonding nonwoven fabric heat bonding process, belt or filter for transport in dryer and heat treatment machine Etc. have been widely used as constituent materials of industrial fabrics. However, since fibers such as PPS monofilaments do not have conductivity, various types of industrial fabrics are charged under high pressure during use and have problems in safety and operability. For this reason, various industrial fabrics using fibers such as PPS monofilaments as a constituent material are used in combination with metal wires such as copper as a wire for removing static electricity, or multifilaments or monofilaments made of polyamide containing conductive carbon black. However, there are drawbacks such as poor dimensional stability of the woven fabric and a decrease in heat resistance and chemical resistance.

[0003] PPS containing conductive carbon black
As a well-known example of the composition, PPS and DBP oil absorption are 320 ml.
/ A composition containing a specific amount of carbon black of at least 100 g, graphite and polytetrafluoroethylene (Japanese Patent Laid-Open No.
JP-A-91556), a composition containing a specific amount of a polyetherimide resin and a conductive carbon black (JP-A-6-49359), and specifying PPS, a metal powder or a metal oxide powder, and a conductive carbon black. (JP-A-7-18170) and a composition containing PPS, an alloy powder having a specific composition and conductive carbon black in a specific amount (JP-A-7-133).
No. 371), which are intended to provide raw materials for parts such as sheets, conductive trays, electromagnetic wave shielding materials, connectors, sockets, etc. in the electric and electronic fields, and the fiber / monofilament of the invention of the present application. There is no description about the form and use for papermaking dryer canvas, net conveyor for thermal bonding nonwoven fabric heat bonding process, conveyor belt in dryer and heat treatment machine or filter fiber / monofilament. It is to be.

[0004] As a known example in which the use of a PPS composition containing conductive carbon black in fibers is described, Japanese Patent Application Laid-Open No. 2-113065 (hereinafter referred to as Reference A) specifies PPS with a specific particle size. The use of PPS mixtures containing conductive carbon black having a surface area, graphite and a specific graft polymer for fibers is described, but the forms of use for fibers and monofilaments which are one form of fibers are described. It has not been. In Reference A, as a means for imparting sufficient conductivity to PPS and maintaining moldability, graphite and a specific graft polymer are required together with conductive carbon black. PPS limited to a maximum of 82% by weight
In addition to the loss of characteristics, compounding and compounding are complicated and industrially disadvantageous. In addition, the use of fibers and monofilaments, which are one form of fibers, as papermaking dryer canvas, net conveyors for the thermal bonding nonwoven fabric heat bonding process, conveyor belts in dryers and heat treatment machines, or as filter fiber / monofilament constituent materials There is no description at all.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made as a result of studying to solve the above-mentioned problems in the prior art, and is a monofilament made of PPS having excellent conductivity and useful as a wire for removing static electricity. The purpose of the present invention is to provide an industrial fabric such as a papermaking dryer canvas using a fiber such as a monofilament and a fiber such as a monofilament, a net conveyor for a thermal bonding nonwoven fabric heat bonding process, a belt for transport in a dryer and a heat treatment machine, or a filter. It is.

[0006]

The above-mentioned objects of the present invention are as follows. 96-85% by weight of polyphenylene sulfide;
It contains 4 to 15% by weight of conductive carbon black having a DBP oil absorption of 300 ml / 100 g or more as measured according to the method of ASTM-D2414-79, and has a specific resistance of 10 ⁹ Ω.
· A papermaking dryer canvas using a fiber such as a polyphenylene sulfide monofilament having a diameter of less than 1 cm and a fiber such as the monofilament as at least a part of a weft and / or a warp constituting a woven fabric, for a thermal bonding nonwoven fabric heat bonding process Industrial fabrics such as belts or filters for transport in net conveyors, dryers and heat treatment machines.

[0007] 2. The fiber is a core-sheath composite yarn, and the sheath component is polyphenylene sulfide 96 to 85 parts by weight, ASTM
DBP oil absorption measured according to the method of -D2414-79 is 3
It contains 4 to 15% by weight of conductive carbon black of 100 ml / 100 g or more, and has a specific resistance of 10 ⁹ Ω ·
cm, polyphenylene sulfide fiber and fibers such as the monofilament are used as at least a part of the weft and / or warp constituting the woven fabric, a dryer canvas for paper making, a net conveyor for a thermal bonding nonwoven fabric heat bonding process, a dryer and Industrial fabrics such as conveyor belts or filters in heat treatment machines.

[0008] 3. As a raw material of polyphenylene sulfide constituting the fiber, 316 according to ASTM D1238-86
° C, orifice diameter 2.095mm, orifice length 8.00mm,
Melt flow rate measured under a load of 5kg is 50g / 10min ~ 3
The polyphenylene sulfide fiber according to any one of claims 1 to 3, wherein the polyphenylene sulfide fiber having a length of 00 g / 10 minutes is used, and the fiber such as the monofilament is used for at least a part of a weft and / or a warp constituting a woven fabric. Industrial fabrics such as dryer canvas for papermaking, net conveyor for thermal bonding nonwoven fabric heat bonding process, conveyor belt or filter in dryer and heat treatment machine.

Can be achieved by

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

PPS constituting the fiber such as the monofilament of the present invention is a polymer in which 90% or more of the repeating units of the polymer are composed of p-phenylene sulfide.
Industrially, it can be obtained by subjecting sodium sulfide to polycondensation reaction with p-dichlorobenzene. Further, a polymer obtained by copolycondensation of less than 10 mol% of trichlorobenzene of p-dichlorobenzene as a branch component may be used.

Raw material PP for PPS constituting the fiber of the present invention
The melt flow rate (hereinafter referred to as MFR) of S can be selected arbitrarily (here, MFR is ASTM D
316 ° C according to 1238-86, orifice diameter 2.095mm,
Orifice length 8.00mm, measured at 5kg load, 1
Effluent polymer amount per minute (g)), MFR
It is particularly preferable to use PPS in the range of 50 g / 10 min to 300 g / 10 min as a raw material because the surface condition of the fiber is also good. When the MFR of the raw material PPS is less than 50 g / 10 minutes, the conductivity of the obtained PPS fiber tends to decrease. When the MFR of the raw material PPS exceeds 300 g / 10 minutes, the surface of the monofilament becomes rough and the strength of the fiber tends to decrease.

In the case where the PPS is obtained by merely washing the PPS after polycondensation with water, there may be mentioned those having a sodium carboxylate terminal group at the terminal. Examples of the PPS after polycondensation washed with an aqueous acetic acid solution and then with water include those having a carboxylic acid terminal group at the terminal. Examples of the PPS after polycondensation washed with an aqueous solution of calcium acetate and then with water include those having a calcium carboxylate terminal group at the terminal. However, P having a carboxylic acid terminal group
The PS may have a small amount of carboxylic acid metal end group, and the PPS having a carboxylic acid metal terminal group may have a small amount of carboxylic acid terminal group.

As the PPS constituting the fiber such as a monofilament made of PPS in the present invention, at least one of the above-mentioned PPS having a carboxylic acid terminal group or PPS having a carboxylic acid metal terminal group may be used alone or in an appropriate combination. Can be.

As PPS, a commercially available product (for example, a product of Toray Industries, Inc.) can be obtained and used.

PPS is usually obtained as a powder, but before it is subjected to melt spinning, the powder PPS is extruded with an extruder or the like.
After heating and melting and kneading S to a temperature equal to or higher than the melting point, if necessary, the mixture is filtered through a filter to remove foreign substances, extruded in a gut shape, cooled, and then cut into a pellet, and used. be able to.

Further, in order to remove oligomers from the PPS powder or PPS pellet, the PPS powder or PPS pellet is subjected to reduced pressure at about 100 to 180 ° C. for 1 to 24 hours before being subjected to molding such as melt spinning. And dried.

The fibers such as monofilaments made of PPS of the present invention include titanium oxide, silicon oxide, calcium carbonate,
Various inorganic particles such as silicon nitride, clay, talc, kaolin, zirconic acid and the like, conductive inorganic particles other than crosslinked polymer particles and conductive carbon black, particles such as various metal particles, and other conventionally known antioxidants , Sequestering agents, ion exchangers, color inhibitors, lightfasters, clathrate compounds, various colorants, waxes, silicone oils, various surfactants, various reinforcing fibers, fluororesins, polyesters, polyamides , Polyolefins and polystyrenes may be added.

PPS monofilament of the present invention
The conductivity of the fibers is 10⁹ Less than Ω · cm
10⁸More preferably, it is less than Ω · cm.

Here, the specific resistance of the above-mentioned fiber such as a monofilament is measured by an ultra-insulation meter S manufactured by Toa Denpa Kogyo KK
This was measured using an M-10E model with a sample length of 1 cm between the electrodes.

The PPS fiber having a specific resistance of less than 10 ⁹ Ω · cm is obtained by adding DBP to a fiber such as a monofilament made of PPS.
Conductive carbon black having an oil absorption of 300 ml / 100 g or more (hereinafter referred to as conductive CB) is 4 to 15
% By weight (where D
The BP oil absorption is measured according to the method of ASTM-D2414-79). Ketchen Black has a DBP oil absorption of 300 ml / 100 g or more.
International Ketjen Black ^TM E
C and "Ketjen Black" ^TM EC600JD are known.

When the amount of CB is more than 15% by weight, the fluidity of the resin decreases, and it becomes difficult to form the resin by, for example, melt spinning. When the amount of carbon black is less than 4% by weight, the conductivity of the obtained monofilament becomes insufficient. More preferably, the content of the conductive CB is 8 to 12% by weight.

The fibers of the present invention include monofilaments, multifilaments, nonwoven fabrics, staple fibers and floc. The form of the fiber includes various forms such as a core-sheath composite yarn, a bimetal composite yarn, and a multilayer composite yarn, in addition to a single structure.

The monofilament of the present invention is a continuous yarn composed of one single yarn.

It is more preferable that the fiber such as the monofilament of the present invention is a core-sheath composite yarn because the fiber has excellent strength.

In the core-sheath conjugate fiber, the core component may be present as a single continuous layer in the sheath component of the core-sheath conjugate fiber, or the core component may be present in the sheath component of the core-sheath conjugate fiber in plural. Sea-island composite fibers present in the form of islands may be used.

In the core-sheath composite yarn, PPS containing 4 to 30% by weight of conductive carbon black may be disposed on at least one of the core and the sheath. 4 ~ 3 carbon black
It is particularly preferable to provide PPS containing 0% by weight because of excellent conductivity.

P containing 4 to 30% by weight of conductive carbon black in at least one of the core and sheath components
In the case of the core-sheath composite yarn provided with PS, any polymer can be used as the polymer constituting the remaining core or sheath, as long as the resin can be melt-molded by heating, and specific thermoplastic resins include, for example, , PPS, as well as polyolefins such as polyethylene and polypropylene, polystyrenes, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and polycyclohexane dimethylene terephthalate, polyamides such as nylon 6, nylon 66, and polyvinylidene fluoride Fluorinated resins such as ethylene-tetrafluoroethylene copolymer, polymethacrylate-based polymers such as polymethyl methacrylate and polyethyl methacrylate, polycarbonates and polyether ether ketone. These polymers can be used alone or in combination of two or more. However, from the viewpoint of heat resistance, PPS, polyethylene terephthalate, polyethylene naphthalate, polycyclohexane dimethylene terephthalate and the like can be used. Polyesters, nylon 6, ethylene / tetrafluoroethylene copolymer, polyetheretherketone, and the like are preferable, and PPS is more preferable.

The composite ratio of the core component and the sheath component in the core-sheath composite fiber is usually 5% by weight of the core component: the sheath component = 5.
0:50 to 95: 5, core component: sheath component = 6
A composite ratio of 0 to 90:40 to 10 is more preferable from the viewpoint of balance between fiber strength and conductivity. The fiber of the present invention can be produced by a known melt spinning method.

In the case where the fiber of the present invention is a core-sheath composite yarn, PPS containing conductive CB is used for at least one of the core and the sheath, and the above-mentioned applicable polymer is used for the other component. Can be carried out by a known core-in-sheath composite spinning method using at least one kind of polymer.
Using a compound spinning machine equipped with a base extruder, melt kneading while metering and supplying PPS containing 4 to 30% by weight of conductive CB to the extruder for the sheath component, and simultaneously forming the extruder for the core component Melting and kneading while metering at least one polymer of the above-mentioned applicable polymers, and subsequently extruding from a core-sheath composite pack / base provided at the end of the extruder, cooling and stretching if necessary.
A method of heat setting is given.

The shape of the cross section perpendicular to the fiber axis direction of the fiber of the present invention typified by a monofilament (hereinafter, referred to as cross section or cross section) is a circle, a flat, a square, a half moon, a triangle, a polygon having five or more angles. It may have any cross-sectional shape, such as a multi-leaf, dog-bone, or cocoon shape. When the monofilament of the present invention is used as a constituent material of an industrial fabric, the monofilament preferably has a circular or flat cross section. In particular, when the monofilament is a warp yarn of a papermaking dryer canvas, a monofilament having a flat cross section is preferably used from the viewpoint of effectively exhibiting antifouling property and flatness of the canvas. The flat in the present invention is an ellipse, a square or a rectangle, but in addition to a mathematically defined exact ellipse, a square or a rectangle, a shape generally similar to an ellipse, a square or a rectangle, for example, a square and a rectangle. It includes a shape with rounded corners. In the case of an ellipse, the length of the long axis (LD) and the length of the short axis (SD) that intersect at right angles at the center of the ellipse satisfy the following equation.
It is preferable that the length (LD) of the long side of the rectangle and the length (SD) of the short side have a relationship satisfying the following expression.

1.0 ≦ LD / SD ≦ 10 The length of the line segment passing through the center of gravity of the monofilament cross section can be appropriately selected depending on the application, but is preferably in the range of 0.05 to 2.5 mm.

The thus obtained fiber such as the monofilament of the present invention has good conductivity, and various types of paper such as a papermaking dryer canvas, a net conveyer for a thermal bonding nonwoven fabric heat bonding step, a dryer or a conveyor belt or a filter in a heat treatment machine, etc. It can be suitably used as an industrial fabric. In addition, the fiber of the present invention can be suitably used as various kinds of cloths that require conductivity.

The industrial fabric of the present invention refers to a papermaking dryer canvas using the monofilament of the present invention for at least a part of the weft and / or warp of the fabric, a net conveyor for a thermal bonding nonwoven fabric heat bonding process, a dryer and a heat treatment. It is an in-machine transport belt or various filters, and the industrial fabric using the monofilament of the present invention as at least a part of the constituent material of the industrial fabric is
It is useful with excellent bending durability.

Here, the papermaking dryer canvas refers to various fabrics such as plain weave, double weave and triple weave (including a spiral fabric in which successive wefts and wefts are woven by a spiral monofilament for a warp). ,
A woven fabric used to dry paper in the dryer of a paper machine. Further, the belt fabric for the heat bonding process of the nonwoven fabric is a woven fabric for passing the nonwoven fabric through a furnace in order to fuse the heat bonding fibers such as polyethylene having a low melting point which constitute the nonwoven fabric. It is a woven fabric such as a heavy weave. In addition, the conveyor belt in the dryer and heat treatment machine is used for drying, heat curing and sterilizing various semi-finished products. A woven fabric that transports a semi-finished product in a high-temperature zone for cooking or the like. In addition, various filters are woven fabrics that filter high-temperature liquids, gases, powders, and the like.

[0036]

EXAMPLES The present invention will be described in more detail with reference to the following examples of monofilaments, which are one preferred form of the fiber of the present invention, and industrial fabrics using the monofilaments.

Example 1 120 g of MFR dried at 150 ° C. under reduced pressure for 16 hours
Raw material PPS powder for 10 minutes (containing metal carboxylate terminal group)
90 parts by weight and “Ketjen Black” ^™ EC (Ketjen Black International).
After mixing with 10 parts by weight (EC), the mixture was fed to a twin-screw kneading extruder (TEM35B, manufactured by Toshiba Machine Co., Ltd.) having a vent having a diameter of 37 mm, L / D 38.9, and co-rotating completely meshing type. Kneading, extrusion, cooling, and cutting were performed at 330 ° C., a rotation speed of 100 rpm, and a discharge rate of 20 kg / hour to obtain PPS pellets containing 10% by weight of K-EC. Next, the pellet was dried at 150 ° C. for 16 hours under reduced pressure, and then dried with a diameter of 50 mm having a spinning head at the tip.
The molten polymer fed to the shaft kneading extruder and kneaded at 320 ° C. for about 2.5 minutes was passed through a filter layer in a spinning pack and a streamline exchanger (“Static Mixer” from US Chemis, Inc.) via a gear pump to obtain a circular cross section. It was extruded into a fiber form from a yarn spinneret and cooled with warm water at 80 ° C. Next, the cooled yarn is subjected to the first-stage stretching in a moist heat atmosphere at 100 ° C. by 2.5 times, the second-stage stretching in hot air at 150 ° C. by 1.22 times, and then 0.92 times at 240 ° C. The monofilament was heat-relaxed twice to obtain a monofilament having a circular section with a diameter of 0.40 mm and a total draw ratio of 2.99. The monofilament has a specific resistance of 4.2 × 10 ⁴ Ω. cm, strength: 2.7 kg, elongation: 36.1%, and the surface condition of the yarn was good without roughness. Table 1 shows the results.

Example 2 The amount of the raw material PPS powder in Example 1 was changed to 95 parts, and the K-EC was changed to "Ketjen Black" ^TM 600 JD.
The properties and surface condition of the monofilament obtained in the same manner as in Example 1 except that the weight was changed to 5 parts by weight (manufactured by Ketjen Black International Ltd .; hereinafter, referred to as K-JD) are also shown in Table 1.

Examples 3 to 9 and Comparative Examples 1 and 2 The blending amount or MF of the raw material PPS powder in Example 1
Table 1 also shows the properties and surface condition of the monofilament obtained in the same manner as in Example 1 except that the amounts of R and K-EC were changed as shown in Table 1.

From the results shown in Table 1, it can be seen that the monofilament of the present invention had excellent conductivity, physical properties and surface condition.

[0041]

[Table 1] Example 10 As a sheath component in a core-sheath composite yarn, 10% by weight of K-EC obtained in the same manner as in Example using 90 parts by weight of the same raw material PPS powder as in Example 1 and 10 parts by weight of K-EC PPS pellets were prepared. In addition, K as a core component
A PPS pellet was prepared in the same manner as in Example 1 except that -EC was not added.

The above-mentioned PPS pellets containing 10% by weight of K-EC for the sheath component and PPS pellets for the core component were subjected to a core-sheath composite spinning, drawing and heat setting by a conventional method using a composite spinning machine having two extruders. With a diameter of 0.5
A monofilament having a core / sheath composite structure having a circular cross section of 0 mm and a core / sheath composite weight ratio of 70/30 was obtained. Table 2 shows the properties and surface conditions of the monofilament.

Examples 11-18, Comparative Examples 3-4 The compounding amount or MF of the raw material PPS powder in Example 6
Table 2 also shows the properties and surface state of the core-sheath composite monofilament obtained in the same manner as in Example 6, except that the amounts of R and K-EC were changed as shown in Table 1.

From the results shown in Table 2, it can be seen that the core-sheath composite monofilament of the present invention had excellent conductivity, physical properties and surface condition.

[0045]

[Table 2] Example 19, Comparative Example 5 PPS pellets obtained in the same manner as in Example 1 except that K-EC was not added were dried under reduced pressure at 150 ° C. for 16 hours, and then a diameter of 50 mm having a spinning head at the tip was obtained. Of the melted polymer supplied to a single-screw kneading extruder at 320 ° C. for about 2.5 minutes through a filtration layer in a spinning pack and a streamline exchanger (“Static Mixer” of Chemis, USA) via a gear pump. It was extruded into a fiber form from a spinneret for a circular cross-section yarn and cooled with warm water at 80 ° C. Next, the cooled yarn is subjected to the first-stage stretching in a moist heat atmosphere at 100 ° C. by 2.5 times, the second-stage stretching in hot air at 150 ° C. by 1.22 times, and then 0.92 times at 240 ° C. A heat treatment was performed to obtain a monofilament (hereinafter, referred to as PPS single yarn) containing no carbon black and having a circular cross section of 0.40 mm in diameter with a total draw ratio of 2.99 times.

The monofilament containing no carbon black was used for warp, and the monofilament obtained in Example 1 (hereinafter referred to as the yarn of Example 1) was used for weft yarn.
An endless plain fabric having a width was prepared and used as a test sample of an industrial fabric. . Next, an electrostatic field measuring device EA manufactured by Rion Co., Ltd.
Using -03, hang the plain fabric on two rollers, 3
The charged voltage when running at a speed of 60 m / min for 2 minutes is 10
It was measured from a distance of cm. The results are shown in Table 3 (Example 1
5).

[0047]

[Table 3] For comparison, Table 3 also shows the withstand voltage measurement results when a 5 cm wide endless plain woven fabric made of the PPS single yarn obtained in Example 15 for both the weft and the warp was used in the same manner as in Example 15. (Comparative Example 5). From the results in Table 3,
It can be seen that the industrial woven fabric using the conductive monofilament of the present invention has an extremely small electrostatic charge and is excellent.

[0048]

The fiber represented by the polyphenylene sulfide monofilament of the present invention has excellent conductivity, physical properties and a good surface state in addition to the inherently excellent heat resistance. It is highly useful for industrial use as various industrial fabrics such as canvases, net conveyors for the thermal bonding nonwoven fabric heat bonding process, conveyor belts or filters in dryers and heat treatment machines.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hironori Yamada 1 Kawara, Showa-cho, Okazaki City, Aichi Prefecture Toray Monofilament Co., Ltd.

Claims (6)

[Claims] 1. Polyphenylene sulfide 96 to 85
% By weight and D measured according to the method of ASTM-D2414-79.
A polyphenylene sulfide fiber having a specific resistance of less than 10 ⁹ Ω · cm, containing 4 to 15% by weight of a conductive carbon black having a BP oil absorption of 300 ml / 100 g or more. 2. The fiber is a core-sheath composite yarn, wherein the sheath component is 96 to 85 parts by weight of polyphenylene sulfide, and ASTM-D
DBP oil absorption measured according to the method of 2414-79 is 30
A polyphenylene sulfide fiber having a specific resistance of less than 10 ⁹ Ω · cm, containing 4 to 15% by weight of conductive carbon black of 0 ml / 100 g or more. 3. The fiber according to claim 1, wherein the fibers are monofilaments.
The polyphenylene sulfide fiber according to any one of claims 1 to 3. 4. As a raw material of polyphenylene sulfide constituting a fiber, 316 according to ASTM D1238-86.
° C, orifice diameter 2.095mm, orifice length 8.00mm,
Melt flow rate measured under a load of 5kg is 50g / 10min ~ 3
The polyphenylene sulfide fiber according to any one of claims 1 to 3, wherein polyphenylene sulfide having a length of 00 g / 10 minutes is used. 5. An industrial fabric comprising the fiber according to any one of claims 1 to 4, wherein at least a part of a weft and / or a warp constituting the fabric is formed. 6. The industrial fabric according to claim 5, wherein the industrial fabric is a papermaking dryer canvas, a net conveyor for a thermal bonding nonwoven fabric heat bonding step, a conveyor belt or a filter in a dryer and a heat treatment machine.