JP2008248405A - Fluororesin monofilament, method for producing the same and industrial woven fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monofilament which has higher tensile strength, loop strength and knot strength than those of a conventional monofilament containing ethylene-tetrafluoroethylene copolymer, when used as at least one portion of an industrial woven fabric, can improve bond strength and durability, and contains ethylene-tetrafluoroethylene copolymer, to provide a method for producing the same, and to provide an industrial woven fabric. <P>SOLUTION: This fluororesin monofilament containing ethylene-tetrafluoroethylene copolymer has a tensile strength of ≥2.0 cN/dtex, a knot strength of ≥1.0 cN/dtex, and a loop strength of ≥2.5 cN/dtex. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention can fully exhibit the excellent heat resistance, chemical resistance, solvent resistance, electrical characteristics, friction characteristics, non-adhesiveness, weather resistance, etc. possessed by the fluorine-based resin, and at least a part of industrial fabrics. Compared to conventional monofilaments made of ethylene-tetrafluoroethylene copolymer, it has high tensile strength, hook strength and knot strength that are important as warp of fabric, and improves joint strength and durability. The present invention relates to a monofilament made of an ethylene-tetrafluoroethylene copolymer, a method for producing the monofilament, and an industrial fabric using the fluorine resin monofilament.

  Conventionally, monofilaments made of thermoplastic resins such as polyamide resins and polyester resins have been used favorably for various industrial materials because they have excellent properties such as heat resistance, strength, and rigidity.

  Similarly, there is an increasing demand for monofilaments having excellent characteristics in industrial textile applications. Especially, monofilaments used for filter textiles require excellent heat resistance, chemical resistance, solvent resistance, etc. However, in conventional monofilaments made of polyamide resin, polyester resin, etc., there are limitations on characteristics and satisfactory characteristics cannot be obtained, so in recent years particularly excellent heat resistance, chemical resistance, solvent resistance, There has been a demand for monofilaments made of a fluorine-based resin having characteristics such as electrical characteristics, friction characteristics, non-adhesiveness, and weather resistance.

  And, among the fluorine-based resins, monofilaments made of polyvinylidene fluoride resin, high-strength monofilaments are already preferably used for marine products, but this polyvinylidene fluoride resin has a melting point lower than that of polyamide resin, and is inferior in heat resistance, Moreover, since a manufacturing method at a considerably low speed is used to obtain a high-strength monofilament, the production efficiency is low and expensive.

  Thus, for industrial textile applications, there is a demand for high-strength monofilaments made of a fluorine-based resin that is both heat resistant and inexpensive.

  On the other hand, with respect to polyester monofilaments, which are typical monofilaments used for industrial textile applications, various studies have been conducted with the aim of increasing their strength. For example, by a multistage stretching process comprising two or more sets of hot rolls. There are known improved polyester monofilaments manufactured (for example, see Patent Document 1) and polyester monofilaments manufactured by a method of stretching after immersion in a dimethylformamide aqueous solution (for example, see Patent Document 2). In addition, although high modulus and high tensile breaking strength characteristics were obtained, the effect of improving the hook strength was not recognized. Polyester monofilaments made of polyethylene naphthalate with high Young's modulus and high catching strength have been proposed (see, for example, Patent Document 3 and Patent Document 4). This polyester monofilament balances Young's modulus and catching strength. The hook strength has not reached the hook strength level of other polyester monofilaments such as conventional polyethylene terephthalate and polybutylene terephthalate, which is insufficient for industrial textile forming materials. It was.

In addition, these polyester monofilament production methods cannot be applied to the production of monofilaments made of an ethylene-tetrafluoroethylene copolymer, and even if applied to this method, a high-strength ethylene-tetrafluoroethylene copolymer is not possible. A polymer monofilament could not be obtained.
JP 2001-279526 A JP 7-42021 A JP 2003-268626 A Japanese Patent Laid-Open No. 7-278554

  The present invention has been achieved as a result of examining the solution of the problems in the above-described prior art as an object.

  Therefore, the object of the present invention is to exhibit the excellent heat resistance, chemical resistance, solvent resistance, electrical characteristics, friction characteristics, non-adhesiveness, weather resistance, and other characteristics of the fluorine-based resin, and industrial textiles. When used for at least a part of the fabric, it has higher tensile strength, hook strength and knot strength, which are important for warp of the fabric, compared with the conventional monofilament made of ethylene-tetrafluoroethylene copolymer, and has strong joint strength and durability. Another object of the present invention is to provide a monofilament made of an ethylene-tetrafluoroethylene copolymer capable of improving the properties, a method for producing the monofilament, and an industrial fabric using the fluorine resin monofilament.

  The industrial fabric of the present invention can effectively prevent misalignment when the fluorine-based monofilament is used for at least a part of the weft and / or the warp. In order to achieve the above object, According to the present invention, it is a monofilament made of an ethylene-tetrafluoroethylene copolymer, and has a tensile strength of 2.0 cN / dtex or more measured according to the provisions of JIS L 1013: 1999, and a knot strength of 1.0 cN / Provided is a fluorine-based resin monofilament characterized by having a dtex or more and a catching strength of 2.5 cN / dtex or more.

  In the fluorine resin monofilament of the present invention, the diameter is preferably 0.05 to 1.5 mm.

  In addition, the above-described method for producing a fluorine-based resin monofilament includes a stretching temperature of 80 to 200 ° C. and a stretching ratio of 5.0 to 6.0 times when the ethylene-tetrafluoroethylene copolymer is melt-spun, stretched, and heat set. And then heat setting at a processing temperature of 180 to 240 ° C. and a set ratio of 0.90 to 1.05, and the undrawn yarn take-up speed at that time is 5 to 15 m / min, after the heat setting. The final take-up speed is 25 to 75 m / min.

  Furthermore, the industrial fabric of the present invention uses the above-mentioned fluorine-based resin monofilament as at least a part of the warp and / or the weft, and meshes with each other a joint formed by folding both ends of the warp into a loop shape. An endless woven fabric constructed through a core wire, characterized in that the above-mentioned fluorine-based resin monofilament is used as the core wire, and is the best when applied to a filter fabric, a papermaking tool fabric and a belt fabric. It is effective.

  According to the present invention, the excellent heat resistance, chemical resistance, solvent resistance, electrical characteristics, friction characteristics, non-adhesiveness, weather resistance, etc. of the fluorine-based resin can be exhibited without regret, and at least the industrial textiles. Compared to conventional monofilaments made of ethylene-tetrafluoroethylene copolymer, it has high tensile strength, hook strength and knot strength, which are important for warp of fabrics. A fluororesin monofilament capable of improving strength and durability can be obtained.

  The industrial fabric using the fluororesin monofilament of the present invention can effectively suppress the occurrence of misalignment, and is best when applied to a filter fabric, a papermaking tool fabric and a belt fabric. Demonstrate the effect.

  The present invention is described in detail below.

  The monofilament made of the ethylene-tetrafluoroethylene copolymer of the present invention (hereinafter referred to as ETFE monofilament) has a tensile strength of 2.0 cN / dtex or more and a knot strength of 1 in accordance with JIS L 1013: 1999. The strength is 0 cN / dtex or more and the catching strength is 2.5 cN / dtex or more, which is characterized by extremely high strength compared to the conventional ETFE monofilament.

  Here, the tensile strength of the ETFE monofilament of the present invention is 2.0 cN / dtex or more, preferably 2.1 cN / dtex or more, more preferably 2.2 cN / dtex or more, and the knot strength is 1.0 cN / dtex or more. Preferably 1.1 cN / dtex or more, more preferably 1.2 cN / dtex or more, and the hook strength is 2.5 cN / dtex or more, preferably 2.6 cN / dtex or more, more preferably 2.7 cN / dtex or more. It is.

  As described above, the ETFE monofilament of the present invention, which has extremely high tensile strength, knot strength, and hook strength, meshes the warp of the fabric and the joint formed by folding both ends of the warp into a loop shape, and passes the core wire through the joint Since it has high tensile strength, hook strength, and knot strength, which are important as the core wire of endless fabrics, it can be preferably used for various industrial fabric applications where the joint strength and durability of fabrics are problematic. Also, filter fabrics and papermaking tool fabrics and belts that are required to have excellent heat resistance, chemical resistance, solvent resistance, electrical properties, friction properties, non-adhesive properties, weather resistance, etc., possessed by fluorine-based resins. It can be preferably applied as a woven fabric, and in that case, an excellent effect which has not been obtained in the past can be expressed.

  The polymer that forms the ETFE monofilament of the present invention is not particularly limited as long as it is an ethylene-tetrafluoroethylene copolymer resin that satisfies the above-described monofilament characteristics.

  The ethylene-tetrafluoroethylene copolymer resin used in the present invention may contain various additives such as pigments, dyes, light proofing agents, ultraviolet absorbers, antioxidants, crystallization inhibitors and plasticizers as necessary. The agent can be added in the polymerization process, after polymerization, or just before spinning as long as the desired performance is not impaired.

 The ETFE monofilament of the present invention having the above characteristics can be efficiently produced by the method described below.

  First, when melt spinning the ETFE monofilament, ETFE resin is supplied to an extruder type spinning machine having a metering gear pump and a spin block at the tip, melted and kneaded at a spinning temperature of 285 to 325 ° C., and then the melted product. When the spun yarn melt-extruded from the spinneret is immediately introduced into a cooling medium bath and cooled, it is taken up at a speed of 5 to 15 m / min to obtain an undrawn yarn.

  It is important to take up this undrawn yarn at a speed of 5 to 15 m / min. If the take-up speed is slower than 5 m / min, the undrawn yarn will meander in the cooling medium bath, so This is not preferable because it tends to cause variations in tensile strength, knot strength, and hook strength, and the undrawn yarns adjacent to each other cannot be fused.

  On the other hand, when the take-up speed of the undrawn yarn is faster than 15 m / min, the roundness is impaired because the undrawn yarn is stretched in the cooling medium bath, and the high tensile strength which is the object of the present invention. Further, since it tends to be difficult to obtain a monofilament having knot strength and hook strength, it is not preferable, and an undrawn yarn is cut halfway and a drawn yarn cannot be obtained.

  The take-up speed of the undrawn yarn is preferably 5 to 15 m / min, more preferably 8 to 13 m / min.

  Next, the obtained undrawn yarn is drawn in at least one or more stages and subsequently subjected to heat setting treatment, and the final speed at that time is 25 to 75 m / min to obtain an ETFE monofilament.

  In order to obtain desired tensile strength, knot strength, and hook strength, the film is stretched in at least one or more stages. The stretching temperature for obtaining stable stretchability is 80 to 200 ° C., the second stage stretching temperature is set to a temperature higher than the first stage stretching temperature, and the overall stretching ratio is 5.0 to 6.0 times. Do so.

  This is because if the draw ratio is too low, it will cause stretch spots, and the resulting ETFE monofilament will not only have the desired tensile strength, knot strength, and hook strength, but also tend to break during weaving. Because. Conversely, if the stretching temperature is too high, it is likely to cause thread breakage. In order to obtain better tensile strength, knot strength, and hook strength, the draw ratio is more preferably 5.3 to 5.7 times.

  Also, if the stretching temperature is too low, high tension is applied during stretching, which tends to cause thread breakage. Conversely, if the stretching temperature is too high, the melting point of the ETFE resin is close, and thread breakage tends to occur in the stretching bath. Must be 80 to 200 ° C., more preferably 90 to 190 ° C.

  Here, the heating medium used in the stretching process may be a substance that can be easily removed from the surface of the ETFE monofilament and that does not essentially give a physical or chemical change to the ETFE monofilament. Any method can be used, but the present invention performs the first-stage stretching at a relatively low temperature, and therefore, a warm water bath or a heated air bath is suitable economically. In addition, as a heat medium used in the second stretching step, generally, a heating apparatus such as a liquid bath filled with an inert liquid having a high boiling point, an air furnace, an inert gas furnace, an infrared furnace, and a high-frequency furnace is used. Is preferred.

The ETFE monofilament stretched in at least one or more stages is continuously heated to further improve and maintain the desired tensile strength, knot strength, hook strength and heat shrinkage characteristics obtained in the stretching process. Although it uses for a set process, the temperature of this set process needs to be 180-240 degreeC, and also it is preferable to set it as 200-230 degreeC.
The set magnification is 0.90 to 1.05, which is a necessary condition for obtaining desired heat shrinkage characteristics.

  If this set magnification is too low, the tensile strength, knot strength, hook strength, and thermal shrinkage of the resulting ETFE monofilament will be low, so not only will the industrial fabrics become poorly stored after heat setting, but also the joint strength and durability Insufficiency is likely to occur, and conversely, if the set magnification is too high, thread breakage is likely to occur. Therefore, it is necessary to set the set magnification to 0.93 to 1.02 times. More preferably, it is 95 to 1.01 times.

  Here, as the heating device used in the set processing step, a liquid bath filled with an inert liquid having a high boiling point similar to the above-described second-stage stretching, an air furnace, an inert gas furnace, an infrared furnace, a high-frequency furnace, etc. Can be mentioned.

  Then, the set ETFE monofilament is provided with an oil agent on the surface as needed, and then wound around a winding tool.

  In this case, the final take-up speed is preferably 25 to 75 m / min.

  The final take-up speed is obtained by multiplying the undrawn yarn take-up speed by the draw ratio or draw ratio / heat setting treatment ratio. If the final take-up speed is lower than 25 m / min, it causes stretch spots and is uniform. Since it tends to be difficult to obtain a monofilament having a wire diameter, it is not preferable, and the desired strength and heat shrinkage characteristics tend to be uneven.

  Further, when the final take-up speed is higher than 75 m / min, it becomes easy to cause a thread breakage. In order to obtain a better uniform wire diameter, desired strength and heat shrinkage, the final take-up speed is 30. It is preferably ˜60 m / min.

  Since the ETFE monofilament of the present invention thus obtained has high tensile strength, knot strength and hook strength not found in conventional ETFE monofilaments, this ETFE monofilament can be used for at least part of industrial fabrics. It is.

  In addition, the industrial fabric composed of the ETFE monofilament of the present invention can be used for a filter fabric, a papermaking tool fabric and a belt fabric, and these various industrial fabrics have stable bonding strength and durability. Easily moldable, chemical resistant, electrical properties, high weather resistance, flame resistance, safety, non-adhesiveness, secondary processability, etc. possessed by ethylene-tetrafluoroethylene copolymer resin Exhibits the excellent characteristics of

  The ETFE monofilament of the present invention is a single continuous yarn, but it may be a plurality of twisted yarns / heat set as needed, or a single yarn twisted and heat set.

  In addition, the cross-sectional shape of the ETFE monofilament of the present invention can be appropriately selected according to its use and is not particularly limited. For example, the shape is round, elliptical, triangular, T, Y, H, + Multi-leaf shape such as 5 leaves, 6 leaves, 7 leaves, 8 leaves, squares, rectangles, rhombuses, saddles, and horseshoe types can be mentioned, and these shapes are partially modified Also good.

  Furthermore, the diameter of the ETFE monofilament of the present invention can be appropriately selected according to its use and is not particularly limited. For example, as an industrial textile use, the diameter is 0.05 to 1.50 mm. Is mainly used.

  Thus, the fluorine-based resin monofilament of the present invention is extremely useful for various applications that require higher tensile strength, knot strength, and hook strength than conventional ETFE monofilaments.

  Next, although this invention is demonstrated based on an Example, the evaluation of the monofilament in an Example was performed according to the following method.

[Operability]
The situation at the time of continuous extrusion spinning was observed, and the following three stages were evaluated based on the yarn breakage and the stability of pushing the raw material into the spinning machine.
○: No problem at all, very good,
Δ: There was some yarn breakage but operation was possible.
X: The operability was difficult due to frequent occurrences of thread breakage and indentation failure of raw materials.

[Fineness]
It measured according to 8.3 of JIS L1013-1999.

[Tensile strength, knot strength, hook strength]
Measure the tensile strength, knot strength and hook strength according to 8.5, 8.6 and 8.7 of JIS L1013-1999, and the values obtained by dividing by the fineness are the tensile strength, knot strength and hook strength (units). : CN / dtex).

[Durability evaluation]
First, a plain woven fabric was prepared by using an ETFE monofilament having a diameter of 0.50 mm as a warp. Next, joint portions formed by forming warp yarns at both ends of the plain fabric in a loop shape were meshed with each other, and an endless plain fabric was formed through a core wire therethrough.

This endless plain woven fabric was used in the belt press filter process for about one month, and the durability by the joint loop was evaluated in the following three stages by the occurrence rate of the number of ETFE monofilaments in the joint.
○: Breaking rate less than 10% Δ: Breaking rate less than 10-30% ×: Breaking rate of 30% or more

[Example 1]
ETFE (Fullon ETFE-C88AXP manufactured by Asahi Glass Co., Ltd.) is used as the fluororesin, and this is supplied to an extruder type spinning machine and melted at a spinning temperature of 315 ° C. When the spun yarn melted and extruded from the die at a discharge rate of 17.3 g / min was immediately introduced into a 50 ° C. water bath and cooled, the undrawn yarn obtained by taking it up at 9.9 m / min. The first stage stretching temperature is 90 ° C., the stretching ratio is 4.00 times, the second stage stretching temperature is 160 ° C., the total stretching ratio is 5.30 times, the processing temperature is 200 ° C., and the set ratio is 0. A set process of 95 times was performed. The final speed at that time was 50 m / min, and an ETFE monofilament having a diameter of 0.50 mm and a circular cross section was obtained.

[Example 2]
ETFE (Fullon ETFE-C88AXP manufactured by Asahi Glass Co., Ltd.) is used as the fluororesin, and this is supplied to an extruder type spinning machine and melted at a spinning temperature of 315 ° C. When the spun yarn melted and extruded from the die at a discharge rate of 27.1 g / min was immediately introduced into a 50 ° C. water bath and cooled, the undrawn yarn obtained at 7.9 m / min was taken up. The first stage stretching temperature is 90 ° C., the stretching ratio is 4.00 times, the second stage stretching temperature is 190 ° C., the total stretching ratio is 5.30 times, the processing temperature is 225 ° C., and the set ratio is 0. A set process of 95 times was performed. The final speed at that time was 40 m / min, and an ETFE monofilament having a diameter of 0.70 mm and a circular cross section was obtained.

[Examples 3 to 4]
In Example 2, Example 3 sets the undrawn yarn take-up speed to 7.7 m / min and the total draw ratio to 5.50 times, and Example 4 sets the undrawn yarn take-up speed to 7.4 m / min. A monofilament having a diameter of 0.70 mm was obtained in the same manner as in Example 2 except that the total draw ratio was changed to 5.70 times.

[Example 5]
ETFE (Fullon ETFE-C88AXP manufactured by Asahi Glass Co., Ltd.) is used as the fluororesin, and this is supplied to an extruder-type spinning machine and melted at a spinning temperature of 315 ° C. When the spun yarn melted and extruded from the die at a discharge rate of 0.55 g / min was immediately introduced into a 50 ° C. water bath and cooled, the undrawn yarn obtained by taking it off at 7.0 m / min was used. The first stage stretching temperature is 95 ° C., the stretching ratio is 3.88 times, the second stage stretching temperature is 140 ° C., the total stretching ratio is 5.30 times, the processing temperature is 180 ° C., and the set ratio is 0. A set process of 95 times was performed. The final speed at that time was 35 m / min, and an ETFE monofilament having a diameter of 0.10 mm and a circular cross section was obtained.

[Example 6]
ETFE (Fullon ETFE-C88AXP manufactured by Asahi Glass Co., Ltd.) is used as the fluororesin, and this is supplied to an extruder-type spinning machine and melted at a spinning temperature of 315 ° C. When the spun yarn melted and extruded from the die was immediately introduced into a 50 ° C. water bath and cooled, the undrawn yarn obtained by taking it up at 7.9 m / min was used. Stretching was performed at a first stage stretching temperature of 90 ° C. with a stretching ratio of 3.88 times, followed by a second stage stretching temperature of 190 ° C. with a total stretching ratio of 5.30 times, followed by a processing temperature of 225 ° C. and a set ratio of 0.8. A set process of 95 times was performed. The final speed at that time was 40 m / min, and an ETFE monofilament having a diameter of 1.10 mm and a circular cross section was obtained.

[Comparative Example 1]
In Example 1, an ETFE monofilament having a diameter of 0.50 mm was obtained in the same manner as in Example 1 except that the first stage stretching temperature was changed from 90 ° C to 70 ° C.

[Comparative Example 2]
In Example 1, an ETFE monofilament having a diameter of 0.50 mm was obtained in the same manner as in Example 1 except that the second stage stretching temperature was changed from 160 ° C to 220 ° C.

[Comparative Example 3]
In Example 1, except that the total draw ratio was changed from 5.30 times to a take-up speed of undrawn yarn of 11.0 m / min and the total draw ratio changed to 4.80 times, An ETFE monofilament having a diameter of 0.50 mm was obtained.

[Comparative Example 4]
In Example 1, except that the total draw ratio was changed from 5.30 times to the undrawn yarn take-up speed of 8.5 m / min and the total draw ratio changed to 6.20 times, An ETFE monofilament having a diameter of 0.50 mm was obtained.

[Comparative Example 5]
In Example 1, an ETFE monofilament having a diameter of 0.50 mm was obtained in the same manner as in Example 1 except that the heat setting temperature was changed from 200 ° C to 160 ° C.

[Comparative Example 6]
In Example 1, an ETFE monofilament having a diameter of 0.50 mm was obtained in the same manner as in Example 1 except that the heat setting temperature was changed from 200 ° C to 250 ° C.

[Comparative Example 7]
In Example 1, an ETFE monofilament having a diameter of 0.50 mm was obtained in the same manner as in Example 1 except that the heat setting magnification was changed from 0.95 times to 0.88 times.

[Comparative Example 8]
In Example 1, an ETFE monofilament having a diameter of 0.50 mm was obtained in the same manner as in Example 1 except that the heat setting magnification was changed from 0.95 times to 1.07 times.

[Comparative Example 9]
In Example 1, the same as Example 1 except that the take-up speed of the undrawn yarn was changed from 9.9 m / min to 4.6 m / min and the final speed of the monofilament was changed from 50.0 m / min to 23.0 m / min. Thus, an ETFE monofilament having a diameter of 0.50 mm was obtained.

[Comparative Example 10]
In Example 1, the same as Example 1 except that the take-up speed of the undrawn yarn was changed from 9.9 m / min to 15.9 m / min and the final speed of the monofilament was changed from 50.0 m / min to 80.0 m / min. Thus, an ETFE monofilament having a diameter of 0.50 mm was obtained.

  The characteristic results of the ETFE monofilaments obtained in Examples 1 to 6 and Comparative Examples 1 to 10 are also shown in Table 1.

  As is clear from the results in Table 1, the ETFE monofilaments of the present invention (Examples 1 to 6) all have a tensile strength of 2.0 cN / dtex or more, a knot strength of 1.0 cN / dtex or more, and a hook strength. It has a high strength at 2.5 cN / dtex or more.

  On the other hand, it was produced by a production method in which the drawing temperature at the time of melt spinning / drawing, the draw ratio, the heat setting temperature, the set ratio, and the undrawn yarn take-off speed and the final speed after the set treatment do not satisfy the conditions of the present invention. ETFE monofilaments (Comparative Examples 1 to 10) all have inferior tensile strength, knot strength, and at least one of hook strength, poor operability (Comparative Examples 1, 2, 7, and 9), and stretch breakage. These were those that could not be produced by spinning (Comparative Examples 4, 6, 8, and 10), and did not sufficiently satisfy the intended effect of the present invention.

  In addition, the ETFE monofilament of Example 1 having high tensile strength, knot strength and hook strength was used as a warp for a plain woven fabric, and the joint portions formed by forming warps at both ends in a loop shape were meshed with each other. When the endless plain fabric through the core wire was subjected to the belt press filter process and the durability by the joint loop was evaluated by the occurrence rate of the number of ETFE monofilaments in the joint, the joint loop failure rate was less than 10% and was good. On the other hand, the ETFE monofilaments of Comparative Examples 3 and 5 have a fracture occurrence rate of less than 10 to 30%, and the ETFE monofilaments of Comparative Examples 1, 2, 7, and 9 have a fracture occurrence rate of 30% or more. Both were inferior results.

  As described above, the ETFE monofilament according to the present invention has dramatically improved high tensile strength, hook strength, and knot strength that are important as a warp of a woven fabric. Use for industrial textiles such as textiles for papers, textiles for paper making tools and textiles for belts is extremely useful.

  Moreover, according to the production method of the present invention, an ETFE monofilament having extremely high tensile strength, hook strength, and knot strength can be efficiently produced.

  Furthermore, the industrial fabric using the ETFE monofilament of the present invention can be used as a filter fabric, a papermaking tool fabric, a belt fabric, and the like. It can improve durability and hardly cause misalignment. Furthermore, it has excellent heat resistance, chemical resistance, solvent resistance, electrical characteristics, friction characteristics, non-adhesiveness, weather resistance, etc. Since it exhibits without regret, it is extremely useful as an industrial fabric.

Claims (8)

A monofilament made of an ethylene-tetrafluoroethylene copolymer, which has a tensile strength of 2.0 cN / dtex or more, a knot strength of 1.0 cN / dtex or more, and a hook strength measured according to JIS L 1013: 1999. Fluorine-based resin monofilament, characterized in that is 2.5 cN / dtex or more. The fluorine resin monofilament according to claim 1, wherein the diameter is 0.05 to 1.5 mm. When melt spinning, stretching, and heat setting the ethylene-tetrafluoroethylene copolymer, stretching is performed at a stretching temperature of 80 to 200 ° C. and a stretching ratio of 5.0 to 6.0 times, and subsequently, a processing temperature of 180 to 240 ° C. is set. The heat setting process is performed at a magnification of 0.90 to 1.05, the undrawn yarn take-up speed is 5 to 15 m / min, and the final take-up speed after the heat setting process is 25 to 75 m / min. The method for producing a fluorine resin monofilament according to claim 1 or 2. An industrial fabric, wherein the fluorine-based resin monofilament according to claim 1 or 2 is used for at least part of warp and / or weft. An endless woven fabric in which joints formed by folding both ends of a warp into a loop shape are engaged with each other and a core wire is passed through the joint, and the core resin is made of the fluorine-based resin monofilament according to claim 1 or 2. An industrial fabric characterized in that The industrial fabric according to claim 4 or 5, which is a filter fabric. The industrial fabric according to claim 4 or 5, which is a fabric for papermaking tools. The industrial fabric according to claim 4 or 5, wherein the industrial fabric is a belt fabric.