JP4867040B2 - Fluorine resin monofilament, process for producing the same, and industrial fabric - Google Patents

Description

  The present invention can fully demonstrate the excellent heat resistance, chemical resistance, combustion resistance, electrical characteristics, friction characteristics, non-adhesiveness, water and oil repellency, weather resistance, etc. possessed by fluorine resins, The fluctuation of the wire diameter in the length direction is much smaller than that of a monofilament made of a conventional tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin. The present invention relates to a monofilament made of a tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin capable of effectively suppressing occurrence of misalignment such as the above, a method for producing the monofilament, and an industrial fabric using the monofilament.

  Conventionally, monofilaments made of thermoplastic resins called general-purpose engineering plastics or super engineering plastics such as polyamide resins, polyester resins, and polyphenylene sulfide resins have excellent characteristics such as heat resistance, strength, and rigidity. It has been preferably used for industrial materials.

  In recent years, fluorine-based resins having particularly excellent heat resistance, chemical resistance, combustion resistance, electrical characteristics, friction characteristics, non-adhesiveness, water / oil repellency, weather resistance, etc. have attracted attention. Monofilaments made of vinylidene resin and the like are preferably used for marine products and the like, but this polyvinylidene fluoride resin has a problem that its melting point is lower than that of polyamide resin and is inferior in heat resistance.

  On the other hand, in the field of industrial textiles, there has been an increasing demand for monofilaments made of fluorine-based resins having excellent characteristics, but in particular, monofilaments used for textile applications for papermaking tools in the papermaking industry obtain the homogeneity of the textiles. Therefore, in particular, uniformity of the wire diameter in the length direction is required, and various studies have been made in the past to obtain a monofilament with small wire diameter fluctuation.

  As prior art relating to such monofilaments having small wire diameter fluctuations, (A) monofilaments free from yarn unevenness obtained by performing cooling uniformly and a method for producing the same (for example, see Patent Document 1), and (B) wire diameter fluctuation rate A core-sheath type composite fiber made of a molten liquid crystalline polyester having a small size and a method for producing the same (for example, see Patent Document 2) have already been proposed.

  In addition, (C) a high melting point monofilament having a small wire diameter variation rate obtained by mist cooling and a method for producing the same (for example, see Patent Document 3), and (D) a polyolefin monofilament having a small wire diameter variation rate obtained by mist cooling and A manufacturing method thereof (for example, see Patent Document 4) has already been proposed.

  However, although the conventional techniques proposed in the above (A), (B), (C) and (D) are all expected to give the desired characteristics, the paper industry In applications where a smaller variation in wire diameter is required, such as monofilaments used in textile applications for papermaking tools, the effects are not necessarily satisfactory.

Further, even when a fluorine-based resin, in particular, a tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin is applied to these conventional technologies, the wire diameter variation rate in the length direction of the wire diameter is suppressed to 5% or less. A monofilament could not be obtained.
Japanese Patent Laid-Open No. 11-93015 JP-A-9-296324 JP 2001-279522 A JP 2002-88568 A

  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 regret the characteristics such as excellent heat resistance, chemical resistance, combustion resistance, electrical characteristics, friction characteristics, non-adhesiveness, water / oil repellency, weather resistance, etc. possessed by fluorine-based resins. When it is used for at least part of industrial textiles, it has much smaller fluctuations in the length of the wire than conventional monofilaments made of tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin (PFA). In addition, a monofilament made of tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin capable of effectively suppressing occurrence of misalignment such as streaks, stripes, steps, etc., a production method thereof, and an industrial fabric using the monofilament It is to provide.

  In order to achieve the above object, according to the present invention, a monofilament made of tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin having a diameter of 0.05 to 1.0 mm, which is an Anritsu laser outer diameter measurement The diameter of the monofilament was measured under the conditions of a measuring speed of 15 m / min, a measuring interval of 0.1 sec / time, and a measuring point of 1024 times using an outer diameter measuring machine according to the machine KG601A. Using a data processor according to -250 & PC, the wire diameter variation in the length direction of the wire diameter was evaluated, and the result was expressed as a variation coefficient [standard deviation (σ) / average defined in JIS-Z8101-1. A fluorine-based resin monofilament characterized by having a wire diameter fluctuation rate represented by a value x 100] of 5% or less.

  Further, in the method for producing a fluorine-based resin monofilament according to the present invention, when the tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin is melt-spun and cooled, the cooling distance from immediately below the die surface to the cooling medium bath is set to 5 to 5. 50 mm, the spun yarn melt-extruded from the die is immediately introduced into a cooling medium bath and cooled, and then the obtained undrawn yarn is taken up at a speed of 5 to 15 m / min, and subsequently drawn in at least one stage or multiple stages. Alternatively, the stretching / heat setting treatment is performed, and the final take-up speed is 25 to 75 m / min.

  The industrial fabric of the present invention is characterized in that the above-mentioned fluorine-based monofilament is used in at least a part of the weft and / or warp, and in particular, industrial applications such as filter fabrics, papermaking tools, and belts. When applied to textile applications, the effect is fully demonstrated.

  The fluorine-based resin monofilament made of the tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin of the present invention is composed of a conventional tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin in which the wire diameter variation in the length direction is Since it is a drastic improvement compared to monofilaments, it is possible to effectively suppress the occurrence of misalignment such as streaks, stripes, steps, etc. in the case of industrial fabrics, and the excellent heat resistance of fluorine resins. Industrial fabrics, especially filter fabrics and fabrics for papermaking tools and belts that maintain good properties such as water resistance, chemical resistance, flame resistance, electrical properties, friction properties, non-adhesiveness, water and oil repellency, and weather resistance A woven fabric can be obtained.

  The present invention is described in detail below.

  The monofilament made of the tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (hereinafter referred to as PFA resin) of the present invention has a wire diameter variation rate of 5% or less, which is extremely small compared to the conventional PFA monofilament. It is characterized by this.

  Here, the linear diameter variation rate (%) in the length direction of the PFA monofilament of the present invention is a measurement speed of a monofilament sample using an outer diameter measuring machine according to an Anritsu laser outer diameter measuring machine KG601A. The wire diameter was measured under the conditions of 15 m / min, measurement interval 0.1 sec / time, and 1024 measurement points, and further obtained using a data processor according to KEYENCE data processor NR-250 & PC. .

  In this measurement method, the outer diameter of the monofilament is measured by laser scattered light, including the major and minor diameters, and the variation in the diameter of the conventional multifilament is measured by the variation in the cross-sectional area obtained from the change in the dielectric constant. It is different from the method.

  Next, the measurement condition is that the outer diameter of the monofilament is measured once every about 2.5 cm in the length direction over a length of about 25 m, and the data for 1024 measurement points is processed to obtain the standard deviation (σ ) And the wire diameter variation rate (%) expressed as a coefficient of variation [standard deviation (σ) / average value × 100] defined in JIS-Z8101-1.

  In addition, the variation rate in the length direction of the PFA monofilament of the present invention measured by such a measuring method is 5% or less, preferably 4% or less, more preferably 3% or less.

  As described above, the PFA monofilament of the present invention having a very small wire diameter variation rate can effectively suppress the occurrence of misalignment such as streaks, stripes, steps, etc., when used as an industrial fabric. Can be preferably used for various industrial textile applications, but can be preferably used as a filter fabric, a papermaking tool fabric, and a belt fabric, and in that case, it is superior in the past. An effect can be expressed.

  The polymer that forms the PFA monofilament of the present invention is not particularly limited as long as it is a PFA resin that satisfies the above-mentioned monofilament characteristics.

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

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

  First, when melt spinning the above PFA monofilament, PFA 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 370 to 380 ° C., and then melted. Is melt extruded from the spinneret.

  When the melt-extruded spun yarn is guided to the cooling medium bath and cooled, the cooling distance from immediately below the die surface to the cooling medium bath is set to 5 to 50 mm, and the spun yarn is immediately transferred to the cooling medium bath. Then, the resultant undrawn yarn is taken up at a speed of 5 to 15 m / min to obtain an undrawn yarn.

  It is important that the cooling distance from just below the die surface to the cooling medium bath is 5 to 50 mm, and an undrawn yarn having a stable wire diameter can be obtained. Further, by using a nickel alloy die for the spinneret, the effect of releasing the heat-denatured foreign matter staying around the die hole is improved.

  When the cooling distance is shorter than 5 m, the cooling of the undrawn yarn becomes unstable and enters the cooling medium bath while the polymer temperature is high, so that bumping occurs on the way and the yarn surface condition tends to deteriorate. Therefore, it is not preferable.

  In addition, when the cooling distance is longer than 50 m, the cooling progresses too quickly and the weight is heavy. Therefore, the warp is generated due to resistance with the guide in the cooling medium bath, and the linear variation tends to be deteriorated.

  Furthermore, it is also important to take up the 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 and the line-thickness variation will be worsened. This is not preferable because it tends to cause the unstretched yarns adjacent to each other to be fused.

  On the other hand, when the take-up speed of the undrawn yarn is higher than 15 m / min, the undrawn yarn is stretched in the cooling medium bath and the roundness is impaired. Since it tends to be difficult to obtain a monofilament having a diameter, it is not preferable, and an undrawn yarn cannot be cut halfway.

  Next, the obtained undrawn yarn is drawn or drawn / heat set in one or more stages, and the final take-up speed at that time is 25 to 75 m / min to obtain a PFA monofilament.

  In order to obtain the desired strength and heat shrinkage properties, the film is stretched in one or more stages. In order to obtain stable stretchability, the stretching temperature in the case of multiple stages is set to a temperature higher than the stretching temperature of the first stage, and the overall stretching ratio is 2.5 to 6.0 times. Do as follows.

  This is because if the draw ratio is too low, it will be difficult to obtain the desired strength and heat shrinkage characteristics for the obtained PFA monofilament, and conversely if it is too high, it will tend to cause yarn breakage. In order to obtain, it is further preferable that it is 4.0 to 5.5 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 PFA resin is close, and thread breakage tends to occur in the stretching bath. Must be 90 to 200 ° C., more preferably 130 to 180 ° C.

  Here, the heat medium used in the stretching process may be a substance that can be easily removed from the surface of the PFA monofilament and that does not essentially give physical or chemical changes to the PFA monofilament. Any heating medium can be used, but the heat medium used in the stretching process of the present invention is generally a hot water bath, a heated air bath, a liquid bath filled with an inert liquid having a high boiling point, or an air furnace. Heating devices such as inert gas furnaces, infrared furnaces, and high frequency furnaces are suitable.

  The PFA monofilament stretched in one or more stages is subjected to a heat setting treatment as necessary in order to further improve and maintain the desired strength and heat shrinkage properties obtained in the stretching process. However, the temperature of the set treatment needs to be 180 to 280 ° C, and more preferably 200 to 250 ° C.

  The set magnification is 0.75 to 1.15 times, which is a necessary condition for obtaining desired heat shrinkage characteristics.

  If the set magnification is too low, the heat shrinkage rate of the resulting PFA monofilament will be low, which will not only make the industrial fabrics shrink after heat setting, but will also cause misalignment of streaks, stripes, steps, etc. On the contrary, if the set magnification is too high, thread breakage is likely to occur. Therefore, it is necessary to set the set magnification to 0.80 to 1.05 times, more preferably 0.85 to 1.01 times. More preferably.

  Here, examples of the heating device used in the set processing step include 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.

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

  The final take-up speed is preferably 25 to 75 m / min.

  As described above, after undrawn yarn is taken up at a speed of 5 to 15 m / min, it is long by drawing or drawing / heat setting treatment in one or more stages in order to obtain desired strength and heat shrinkage characteristics. A PFA monofilament with a small variation in the wire diameter in the vertical direction can be obtained.

  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 PFA monofilament of the present invention thus obtained has a small wire diameter fluctuation rate that is not found in the conventional PFA monofilament, the PFA monofilament can be used for at least a part of the industrial fabric.

  In addition, the industrial fabric comprising the PFA monofilament of the present invention can be used as a filter fabric, a papermaking tool fabric, and a belt fabric. It is possible to maintain a stable woven surface that is less likely to slip, and has easy moldability, heat resistance, chemical resistance, combustion resistance, electrical characteristics, friction characteristics, non-adhesiveness, and water repellency that PFA resins have. Exhibits excellent properties such as oil repellency, weather resistance and secondary processability.

  The PFA monofilament of the present invention is a single continuous yarn. However, if necessary, a plurality of yarns may be twisted and heat-set together, or may be a heat-set by twisting a single yarn.

  In addition, the cross-sectional shape of the PFA monofilament of the present invention can be appropriately selected according to the application, 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 PFA monofilament of the present invention can be appropriately selected according to its use and is not particularly limited. For example, for industrial textile use, the diameter is 0.05 to 1.00 mm. Is mainly used.

  Thus, the fluorine-based resin monofilament of the present invention is extremely useful for various textile applications that require smaller wire diameter fluctuations than conventional PFA 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.

[Variation rate of wire diameter]
Using an outer diameter measuring machine according to Anritsu laser outer diameter measuring machine KG601A, the outer diameter was measured under the conditions of a measuring speed of 15 m / min, a measuring interval of 0.1 sec / time, and a measuring point of 1024 times. Using a data processor according to NR-250 & PC manufactured by the manufacturer, the wire diameter variation in the length direction of the wire diameter was evaluated, and the result was expressed as a coefficient of variation [standard deviation defined in JIS-Z8101-1. The value represented by (σ) / average value × 100] was defined as the wire diameter variation rate.

[Operability]
The situation at the time of continuous extrusion spinning was observed, and the following three stages were evaluated from yarn breakage and 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.

[Missing]
Regarding the evaluation of the misalignment of the filter, the obtained filter 1 m ² was visually inspected (streaks, stripes, steps), and the degree of misalignment was evaluated in the following three stages. In addition, (circle) is a level with a favorable appearance quality.
○: Streaks, stripes, steps are unknown
Δ: streaks, stripes, steps are recognized,
X: Generation of streaks, stripes, and steps is remarkable.

[Example 1]
PFA ("Full-on" PFA P-62XP manufactured by Asahi Glass Co., Ltd.) is used as a fluorine-based resin, which is supplied to an extruder-type spinning machine, melted at a spinning temperature of 380 ° C, and a nickel alloy having a pore diameter of 2.0 mm. When spinning the spun yarn that was spun at a discharge rate of 38.0 g / min per single hole through a manufactured spinneret and was melt-extruded from the spout immediately into a 50 ° C. water bath and cooled, The unstretched yarn obtained by setting the cooling distance to the bath to 20 mm and taking it up at 7.7 m / min was stretched in one step at a stretching temperature of 150 ° C. and a stretching ratio of 4.80 times, and subsequently the processing temperature was 220 ° C. and A set process with a set magnification of 0.95 was performed. The final speed at that time was 35 m / min, and a PFA monofilament having a diameter of 0.20 mm and a circular cross section was obtained.

[Example 2]
A PFA monofilament having a diameter of 0.20 mm was obtained in the same manner as in Example 1 except that the cooling distance 20 mm was changed to 5 mm.

[Example 3]
A PFA monofilament having a diameter of 0.20 mm was obtained in the same manner as in Example 1 except that the cooling distance 20 mm was changed to 45 mm in Example 1.

[Example 4]
PFA ("Full-on" PFA P-62XP manufactured by Asahi Glass Co., Ltd.) is used as a fluorine-based resin, which is supplied to an extruder-type spinning machine, melted at a spinning temperature of 380 ° C, and a nickel alloy having a pore diameter of 1.0 mm. When spinning the spun yarn that was spun at a discharge rate of 35.0 g / min per single hole through a manufactured spinneret and immediately melt-extruded from the die into a 50 ° C. water bath and cooled, The unstretched yarn obtained by setting the cooling distance to the bath to 20 mm and taking it up at 11.0 m / min was stretched in one step at a stretching temperature of 150 ° C. and a stretching ratio of 4.80 times, and subsequently the processing temperature was 220 ° C. and A set process with a set magnification of 0.95 was performed. The final speed at that time was 50 m / min, and a PFA monofilament having a diameter of 0.10 mm and a circular cross section was obtained.

[Example 5]
PFA ("Full-on" PFA P-62XP manufactured by Asahi Glass Co., Ltd.) is used as a fluorine-based resin, which is supplied to an extruder-type spinning machine, melted at a spinning temperature of 380 ° C, and a nickel alloy having a pore diameter of 3.0 mm. When spinning the spun yarn, which was spun at a discharge rate of 13.4 g / min per single hole through a manufactured spinneret and was melt-extruded from the die, was immediately introduced into a 50 ° C. water bath and cooled, a cooling medium was applied from directly below the die surface. The unstretched yarn obtained by setting the cooling distance to the bath to 20 mm and taking it up at 11.0 m / min was stretched in one step at a stretching temperature of 150 ° C. and a stretching ratio of 4.80 times, and subsequently the processing temperature was 220 ° C. and A set process with a set magnification of 0.95 was performed. The final speed at that time was 50 m / min, and a PFA monofilament having a diameter of 0.40 mm and a circular cross section was obtained.

[Example 6]
PFA ("Full-on" PFA P-62XP manufactured by Asahi Glass Co., Ltd.) is used as a fluorine-based resin, which is supplied to an extruder-type spinning machine, melted at a spinning temperature of 380 ° C, and a nickel alloy having a pore diameter of 5.0 mm. When spinning the spun yarn that was spun at a discharge rate of 32.7 g / min per single hole through a manufactured spinneret and immediately led to a bath in a 50 ° C. water bath and cooled, a cooling medium was applied immediately below the die surface. The unstretched yarn obtained by setting the cooling distance to the bath to 20 mm and taking it up at 8.8 m / min was stretched in one step at a stretching temperature of 150 ° C. and a stretching ratio of 4.80 times, and subsequently the processing temperature was 220 ° C. and A set process with a set magnification of 0.95 was performed. The final speed at that time was 40 m / min, and a PFA monofilament having a diameter of 0.70 mm and a circular cross section was obtained.

[Example 7]
PFA ("Full-on" PFA P-62XP manufactured by Asahi Glass Co., Ltd.) is used as the fluorine-based resin, which is supplied to an extruder-type spinning machine and melted at a spinning temperature of 380 ° C., and a nickel alloy having a pore diameter of 8.0 mm. When spinning the spun yarn that was spun at a discharge rate of 67.5 g / min per single hole through a manufactured spinneret and immediately melt-extruded from the die into a 50 ° C. water bath and cooled, The unstretched yarn obtained by setting the cooling distance to the bath to 20 mm and taking it up at 8.8 m / min was stretched in one step at a stretching temperature of 150 ° C. and a stretching ratio of 4.80 times, and subsequently the processing temperature was 220 ° C. and A set process with a set magnification of 0.95 was performed. The final speed at that time was 40 m / min, and a PFA monofilament having a diameter of 0.90 mm and a circular cross section was obtained.

[Comparative Example 1]
In Example 1, a PFA monofilament having a diameter of 0.20 mm was obtained in the same manner as Example 1 except that the cooling distance 20 mm was changed to 3 mm.

[Comparative Example 2]
In Example 1, a PFA monofilament having a diameter of 0.20 mm was obtained in the same manner as Example 1 except that the cooling distance 20 mm was changed to 60 mm.

[Comparative Example 3]
In Example 1, a PFA monofilament having a diameter of 0.20 mm was obtained in the same manner as in Example 1 except that the undrawn yarn take-up speed was reduced to 4.4 m / min and the final speed was reduced to 20.0 m / min. Obtained.

[Comparative Example 4]
In Example 1, a PFA monofilament having a diameter of 0.20 mm was formed in the same manner as in Example 1 except that the undrawn yarn take-up speed was increased to 15.4 m / min and the final speed was increased to 70.0 m / min. Obtained.

[Comparative Example 5]
In Example 1, the diameter of the undrawn yarn was changed to 6.1 m / min, the draw ratio was changed to 4.00 times, and the final speed was changed to 23.0 m / min. A 0.20 mm PFA monofilament was obtained.

[Comparative Example 6]
In Example 1, the diameter of the undrawn yarn was changed to 14.0 m / min, the draw ratio was changed to 6.00 times, and the final speed was changed to 80.0 m / min. A 0.20 mm PFA monofilament was obtained.

  As described above, Table 1 shows the results of variation in the line diameter of each PFA monofilament obtained in Examples 1 to 7 and Comparative Examples 1 to 6.

  As is apparent from the results in Table 1, the PFA monofilaments of the present invention (Examples 1 to 7) all have a very small fluctuation rate of the wire diameter in the length direction of 5% or less.

  On the other hand, the PFA monofilament (Comparative Examples 1 to 6) produced by a production method in which the cooling distance from just below the die surface to the cooling medium bath, the take-up speed of the undrawn yarn, and the final speed of the monofilament do not satisfy the conditions of the present invention, Both are poor in operability, have a large variation rate of the wire diameter in the length direction (Comparative Examples 1-3, 5), and can not be drawn after being stretched (Comparative Examples 4, 6). The effect to do was not fully satisfied.

In addition, a plain fabric was woven using the PFA monofilaments having a diameter of 0.20 mm obtained in Example 1 and Comparative Examples 1 to 3 for warp and weft, respectively, and this fabric was heat-set at 200 ° C. When a filter having a basis weight of 500 g / m ² was produced, the filter using the PFA monofilament of Example 1 as a filter constituent wire, which had a small variation in the diameter in the length direction, did not cause misalignment. In the PFA monofilaments of Comparative Examples 1 to 3 and 5, misalignments such as streaks, stripes and steps were observed.

  As described above, the PFA monofilament of the present invention is a drastically improved wire diameter variation in the length direction compared to the conventional PFA monofilament. For example, the filter fabric and the papermaking tool fabric and Use for industrial fabrics such as belt fabrics is extremely useful.

  Moreover, according to the manufacturing method of the present invention, a PFA monofilament with a very small wire diameter variation rate in the length direction can be efficiently manufactured.

  Furthermore, the industrial fabric using the PFA monofilament of the present invention can be used for a filter fabric, a papermaking tool fabric, a belt fabric, and the like. It is possible to maintain a stable woven surface that is less prone to misalignment such as stripes and steps, and it is easy to mold, heat resistance, chemical resistance, combustion resistance, electrical characteristics, friction characteristics of PFA resin. , Non-adhesiveness, water / oil repellency, weather resistance, secondary workability, etc.

Claims (6)

A monofilament made of tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin having a diameter of 0.05 mm to 1.0 mm, using an outer diameter measuring device according to Anritsu laser outer diameter measuring machine KG601A, and measuring speed The wire diameter of the monofilament was measured under the conditions of 15 m / min, measurement interval 0.1 second / time, and measurement point 1024 times, and further using the data processor according to Keyence data processor NR-250 & PC, The wire diameter fluctuation rate in the length direction of the diameter is evaluated, and the wire diameter fluctuation rate expressed as a coefficient of variation [standard deviation (σ) / average value × 100] defined by JIS-Z8101-1 is 5% or less. Fluorine-based resin monofilament characterized by When melt spinning and cooling the tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin, the cooling distance from immediately below the die surface to the cooling medium bath is set to 5 to 50 mm, and the spun yarn melt-extruded from the die is immediately It is led to a cooling medium bath and cooled, and then the obtained undrawn yarn is taken up at a speed of 5 to 15 m / min, followed by drawing or drawing / heat setting treatment in one or more stages, and final take-up at that time The method for producing a fluorine resin monofilament according to claim 1, wherein the speed is 25 to 75 m / min. An industrial fabric comprising the fluorine-based resin monofilament according to claim 1 as at least a part of a weft and / or a warp. The industrial fabric according to claim 3, wherein the industrial fabric is a filter fabric. The industrial fabric according to claim 3, wherein the industrial fabric is a papermaking tool fabric. The industrial fabric according to claim 3, which is a belt fabric.