JP2014095167A - Polyphenylene sulfide monofilament and industrial fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyphenylene sulfide monofilament and an industrial fabric expressing excellent process passability by improving yarn cutting or yarn breakage at the time of warp yarn weaving or beating up of the weft yarn during manufacturing an industrial fabric.SOLUTION: A polyphenylene sulfide is made from a monofilament, and has tensile strength measured according to JIS L1013:2008 of 2.00 cN/dtex or more, tensile elongation of 15% to 70%, loop strength measured according to same specification of 2.20 cN/dtex or more, further impact breaking strength calculated by dividing strength by fineness when cutting of a monofilament with energy of 5.15 J and impact velocity of 1.7 m/sec., is 1.80 cN/dtex or more.

Description

  Since the present invention has excellent strength and elongation properties and impact durability, when weaving industrial fabrics, yarn cracking and thread breakage hardly occur, and shows extremely stable process passage properties, such as paper fabrics. The present invention relates to a polyphenylene sulfide monofilament that can be suitably used as a constituent material of an industrial fabric represented by (2) and an industrial fabric using the same.

  Polyphenylene sulfide (hereinafter referred to as PPS) is excellent in heat resistance, chemical resistance and flame retardancy, and can be melt-molded. Widely used as and fiber. Among these, PPS fibers are used in various applications such as industrial fabrics such as papermaking dryer canvas, filters, and brush hairs, taking advantage of their excellent heat resistance, chemical resistance and flame retardancy.

  However, fibers made of PPS have the problem that the physical properties of tensile strength, knot strength and hook strength are insufficient compared to polyester fibers and polyamide fibers, and more recently, the state-of-the-art of paper tool manufacturers. Due to the introduction of large-scale high-speed looms, problems such as yarn breakage and thread breakage due to impacts during hammering and weft driving have become apparent, and productivity has been reduced. There is a growing demand for the realization of PPS monofilaments with improved properties. For this reason, various proposals have been made for the purpose of improving these physical characteristics and improving processability during weaving.

  For example, the PPS undrawn yarn is drawn in one step at a ratio higher than the natural draw ratio, and then subjected to constant length heat treatment at 150 to 260 ° C. or higher and higher than the first stage drawing temperature, or the total draw ratio is set in the same temperature range. Melting PPS fiber (for example, see Patent Document 1) and PPS with improved mechanical properties, heat resistance, and chemical resistance by two-stage stretching so that the first-stage draw ratio is 1 to 2 times. The undrawn yarn obtained by spinning is drawn 2 to 7 times at 80 to 260 ° C, and then taken in a dry heat atmosphere of 285 to 385 ° C at a take-up ratio of 0.8 to 1.35 times for 0.1 to 30 seconds. PPS fibers with a tensile strength of 3.5 g / d or more and a hooking strength of 2.5 g / d or more with improved bending wear and bending fatigue characteristics (for example, see Patent Document 2) have been proposed. However, PPS fibers and PPS modules obtained with these technologies Although the filament has some physical properties, it does not mention impact resistance. When it is actually used as an industrial textile raw yarn, There was a problem that yarn breakage due to impact at the time of beating, and weft breakage due to impact at the time of high speed driving occurred.

  It also improves the physical properties extruded from a mixture of 25 to about 99 parts by weight polyphenylene sulfide, about 75 to 1 parts by weight polyamide resin, and about 0.1 to 10 parts by weight compatibilizer. Monofilaments (see, for example, Patent Document 3) have been proposed, but in this case, it is difficult to produce a monofilament by mixing a plurality of materials, and specific physical characteristics such as wear are improved. However, other physical properties such as other tensile strengths are deteriorated.

JP-A-64-3961 JP-A-4-222217 Publication 2000-508720

  In view of the circumstances as described above, the present invention has been achieved as a result of studying the solution of problems in the prior art as an issue.

  That is, an object of the present invention is to provide a PPS monofilament having excellent strength and impact resistance even when used on a state-of-the-art high-speed large-scale loom, and more specifically, weaving industrial textiles. To provide a PPS monofilament that is less likely to cause thread breakage or thread breakage, exhibits extremely stable processability, and can be suitably used as a constituent material for industrial fabrics typified by papermaking fabrics. is there.

  In order to achieve the above object, according to the present invention, a monofilament composed of PPS, having a tensile strength measured in accordance with JIS L1013: 2008 of 2.00 cN / dtex or more and a tensile elongation of 15% or more. Less than 70%, the hook strength measured according to the same standard is 2.20 cN / dtex or more, further gives a force of energy 5.15 J, impact speed 1.7 m / sec, and the strength when the monofilament is cut is fine There is provided a PPS monofilament characterized in that the impact fracture strength calculated by repeated calculation is 1.80 cN / dtex or more.

  In addition, the method for producing a PPS monofilament of the present invention is a method in which PPS is melt-extruded and an undrawn yarn obtained by cooling and solidifying in warm water of 65 ° C. or higher and 95 ° C. or lower is subjected to a temperature atmosphere of 90 ° C. or higher and 110 ° C. or lower. In the range of 3.20 times or more and 4.00 times or less, the first stage stretching is performed, and the second stage stretching is performed in the temperature atmosphere of 100 ° C. or more and 260 ° C. or less in the range of 1.00 times or more and 1.50 times or less. Then, after stretching so that the total stretching ratio is in the range of 4.00 times to 4.80 times, it is continuously 0.80 times to 1.00 times in a temperature atmosphere of 100 ° C. to 270 ° C. It is characterized by heat setting in the following range.

  Furthermore, the industrial fabric of the present invention is characterized in that the PPS monofilament described above is used in at least a part of warp and / or weft, and can be suitably used particularly as a papermaking fabric. Therefore, it is possible to realize a very stable process passability when weaving industrial fabrics.

  According to the present invention, even when used on a state-of-the-art high-speed large-scale loom, a PPS monofilament having excellent strength and impact durability and impact durability can be obtained. It is possible to obtain a PPS monofilament that does not easily break and exhibits extremely stable process passability and can be suitably used as a constituent material for industrial fabrics typified by papermaking fabrics.

  Hereinafter, the present invention will be described in more detail.

  The PPS resin used in the present invention means a polymer in which the polymer repeating unit contains a phenylene sulfide unit composed of a p-phenylene sulfide unit or an m-phenylene sulfide unit. Among these polymers, a polymer in which 90% or more of the repeating units are composed of p-phenylene sulfide units is preferably used.

  A PPS polymer that can be particularly preferably used in the present invention can be produced by polycondensation reaction of sodium sulfide with p-dichlorobenzene, but the p-dichlorobenzene is used as a branching component with less than 10 mol% of trichlorobenzene. It may be produced by polycondensation.

  In the present invention, in accordance with ASTM D1238-86, the melt indicated by the amount (g) of spilled polymer per 10 minutes measured at 316 ° C., orifice diameter 2.095 mm, orifice length 8.00 mm, and load 5 kg. PPS having a flow rate (hereinafter referred to as MFR) of about 20 to 300 g / 10 min can be used, but in particular, MFR is 70 to 200 g / 10 from the standpoints of balance of strength and elongation, diameter unevenness, wear characteristics, and yarn production. PPS of about a minute can be preferably used. Here, as PPS which can be used as a commercial item, E1880, E2080, E2280, E2481, M2488, M2588, etc. of Toray Industries, Inc. can be mentioned, for example. In addition, even if the PPS resin used by this invention is not the PPS chip | tip which can be obtained as the above-mentioned commercial item, even if it uses the reproduction | regeneration PPS resin obtained by recycling PPS film waste, PPS fiber waste, etc., there is no problem. Absent. PPS is usually obtained in powder form, but before being subjected to melt spinning, the powder PPS is heated to a temperature higher than the melting point with an extruder or the like, melted and kneaded, and then foreign matter is filtered with filters if necessary. It can be removed, extruded into a gut shape, cooled, and then processed into a pellet by a method such as cutting. The PPS powder or PPS pellets are preferably subjected to spinning after being dried at about 100 to 180 ° C. for about 5 to 24 hours under a vacuum.

  The PPS monofilament of the present invention is characterized in that the tensile strength measured according to JIS L1013: 2008 is 2.00 cN / dtex or more, and the hook strength measured according to the same standard is 2.20 cN / dtex or more. .

  Here, when the tensile strength is less than 2.00 cN / dtex and the hook strength is less than 2.20 cN / dtex, the practical strength of the obtained industrial fabric is lowered, and the woven joint portion or warp and weft of the industrial fabric intersect. This leads to an unfavorable situation such as the occurrence of thread breakage or thread breakage at the so-called knuckle portion.

  The PPS monofilament of the present invention is characterized in that its tensile elongation is 15% to 70%, preferably 20% to 65%, and more preferably 25% to 60%. The improvement of the dimensional stability of industrial fabrics and the manifestation of effects such as extremely good processability during weaving can be expected.

  Here, with PPS monofilaments having a tensile elongation of less than 15%, not only the occurrence of yarn breakage during weft driving is increased, but also the variation in hook strength tends to increase, resulting in stable quality. It becomes a PPS monofilament lacking.

  On the other hand, PPS monofilaments with high elongation exceeding 70% have few problems such as yarn breakage when using warp and yarn breakage when weft is driven. Excessive elongation appears as a characteristic of industrial fabrics as it is, which is not preferable because the fabric is very easy to stretch and the dimensional stability becomes insufficient.

  Furthermore, the PPS monofilament of the present invention gives a force of energy 5.15 J and an impact speed of 1.7 m / sec, and has an impact fracture strength calculated by dividing the strength when the monofilament is cut by the fineness to 1.80 cN / dtex. In this case, when the impact breaking strength is less than 1.80 cN / dtex, yarn breakage or thread breakage frequently occurs due to impact at the time of hammering or weft driving, and weaving Process passability deteriorates, leading to an unfavorable situation of reducing productivity.

  Next, a method for producing the PPS monofilament of the present invention having the above characteristics will be described.

  First, the method for producing a PPS monofilament of the present invention is characterized in that PPS is melt-extruded and cooled and solidified in hot water of 65 ° C. or higher and 95 ° C. or lower, but the range of 75 ° C. or higher and 85 ° C. or lower is particularly stable. This is preferable because yarn-making properties can be obtained. If the temperature of the hot water to be cooled and solidified is less than 65 ° C., bubbles are generated inside the yarn due to the rapid cooling of the molten polymer, or the running safety state of the monofilament unstretched yarn deteriorates in the cooling process, This leads to an unfavorable situation such as a cause of stretching breakage in the subsequent stretching step or a decrease in physical properties of the obtained PPS monofilament. In addition, when the cooling temperature exceeds 95 ° C., a large amount of bubbles generated by boiling the hot water used as the cooling solvent by the heat of the PPS molten polymer on the surface of the PPS molten polymer led to the cooling step, As a result, many irregularities are generated on the surface of the undrawn PPS yarn, which is not preferable.

  Subsequently, the obtained undrawn yarn is first-stage drawn in a temperature range of 3.20 times to 4.00 times in a temperature atmosphere of 90 ° C. or higher and 110 ° C. or lower. When performing the first-stage stretching of 0.000 or less, if the stretching temperature is less than 90 ° C, the amount of heat becomes insufficient, and the first-stage stretching step tends to cause breakage of the stretching, and the temperature is 110 ° C. If it exceeds, a phenomenon called “super draw” in which only the thickness of the yarn becomes thin while the yarn orientation does not progress is undesirable.

  Next, in the second stage stretching step, stretching is performed at a temperature of 100 ° C. to 260 ° C. in a temperature atmosphere of 1.00 times to 1.50 times, and the total stretching ratio is 4.00 times to 4.80 times. However, in the second-stage drawing step, the drawing is preferably performed at 1.10 times or more and 1.40 times or less in a temperature atmosphere of 120 ° C. or more and 240 ° C. or less. It is preferable in order to improve the physical characteristics.

  That is, if the second stage stretching temperature is less than 100 ° C., the amount of heat is insufficient and stretching breakage tends to occur. Conversely, when the stretching temperature exceeds 260 ° C., the physical properties of the resulting PPS monofilament This is not preferable because the characteristics deteriorate.

  In the method for producing a PPS monofilament according to the present invention, the first-stage drawing conditions are the drawing temperature of 90 ° C. or more and 110 ° C. or less, the draw ratio is 3.20 times or more and 4.00 times or less, and the second-stage drawing condition is 100. It is important to adjust the total draw ratio to 4.00 times or more and 4.80 times or less under a temperature atmosphere of ℃ to 260 ℃, and adjust the total draw ratio to 4.00 times or more and 4.80 times or less. Is less than 4.00 times, the tensile strength of the resulting PPS monofilament is reduced, and when the total draw ratio exceeds 4.80 times, the impact breaking strength of the resulting PPS monofilament is reduced. Stable yarn-making performance can be achieved by satisfying the first-stage drawing condition, the second-stage drawing condition and the total drawing condition at the same time. Furthermore, the tensile strength is 2.00 cN / dtex or more, the tensile elongation is 15% or more and 70% or less, the catching strength is 2.20 cN / dtex or more, and the impact breaking strength is 1.80 cN / dtex or more, which is a feature of the PPS monofilament of the present invention. This makes it possible to achieve high elongation characteristics and impact rupture strength.

  In the method for producing a PPS monofilament of the present invention, in addition to the stretching conditions, heat setting is performed in a temperature atmosphere of 100 ° C. or more and 270 ° C. or less in a range of 0.80 times or more and 1.00 times or less. However, when the heat setting temperature is less than 100 ° C., sufficient heat setting cannot be performed, and thus the shrinkage characteristics of the PPS monofilament vary. As a result, the shrinkage variation of the PPS monofilament is adversely affected in the heat setting process during weaving of the fabric In addition, the fabric is jerked or loosened, which leads to undesirable results such as a loss of surface smoothness of the fabric. On the other hand, when the heat setting temperature exceeds 270 ° C., the temperature is too high, so that the relaxation of stretch orientation becomes too large, and the physical characteristics of the PPS monofilament are extremely lowered, which is not preferable. Moreover, even when the heat set magnification is less than 0.80 times, the relaxation of the orientation of the monofilament due to the heat set is increased, resulting in a decrease in physical properties. When the heat set magnification is higher than 1.00 times, the stretching strain is removed by the heat set. This is not preferable because it becomes insufficient and the setability at the time of weaving the fabric deteriorates.

  The diameter of the PPS monofilament of the present invention is not particularly limited, but is 0.05 to 3.00 mm, particularly 0.10 to 2.50 mm when used as a constituent material for industrial textiles. Is preferred.

  Further, the cross-sectional shape of the PPS monofilament of the present invention is not particularly limited, and is circular, oval, triangular, square, flat, rhombus, half moon, pentagon or more polygon, multileaf, dog Examples of the shape include a bone shape and a saddle shape. In particular, when the material is used as a constituent material of an industrial fabric, a circular shape, an oval shape, or a flat shape is preferable.

  Furthermore, as long as the PPS monofilament of the present invention does not exclude the intended characteristics, various inorganic particles such as titanium oxide, silicon oxide, silicon nitride, clay, talc, kaolin, and zirconium acid, and crosslinked polymer particles, Conventionally known antioxidants, sequestering agents, ion exchangers, anti-coloring agents, light-proofing agents, inclusion compounds, various coloring agents, waxes, silicone oils, various surfactants, various reinforcing fibers, fluororesins , Polyamides, polyesters, polyolefins, polystyrenes, and the like.

  The PPS monofilament of the present invention thus obtained has a stable yarn-forming property and becomes a PPS monofilament having excellent strength and impact durability even when used in a state-of-the-art high-speed large-scale loom. When weaving a woven fabric, yarn breakage and thread breakage are unlikely to occur, exhibit extremely stable processability, and can be suitably used as a constituent material for industrial fabrics typified by yarn making fabrics.

  Hereinafter, the PPS monofilament of the present invention will be described in more detail, but the present invention is not limited to the following examples unless it exceeds the gist.

The physical properties of the PPS monofilament of the present invention described above and below are values measured by the following method.
(1) Tensile strength of monofilament “Tensilon” UTM-4 manufactured by Orientec Co., Ltd. in a temperature and humidity adjustment chamber at 20 ° C. and 65% RH according to the method described in Section 8.5 of JIS L1013: 2008 Using a -100 type tensile tester, measure under the conditions of a test length of 250 mm and a tensile speed of 300 mm / min, determine the strength when the sample is cut, calculate the strength (cN / dtex) by dividing the strength by the fineness It was shown as the average value of 10 measurements.
(2) Tensile elongation of monofilament In accordance with the method described in Section 8.5 of JIS L1013: 2008, in a temperature / humidity adjustment chamber at 20 ° C. and 65% RH, “Tensilon” UTM- manufactured by Orientec Co., Ltd. Using a 4-100 type tensile tester, measurement was performed under the conditions of a test length of 250 mm and a tensile speed of 300 mm / min, and the elongation when the sample was cut was determined.

(3) Hatch strength of monofilament According to the method described in 8.7 of JIS L1013: 2008, “Tensilon” UTM-4 manufactured by Orientec Co., Ltd. in a temperature / humidity adjustment chamber at 20 ° C. and 65% RH. Using a -100 type tensile tester, measure under the conditions of a test length of 250 mm and a tensile speed of 300 mm / min, determine the strength when the sample is cut, calculate the strength (cN / dtex) by dividing the strength by the fineness It was shown as the average value of 10 measurements.
(4) Impact breaking strength When using a pendulum type impact tester manufactured by Shimadzu Corporation, applying a force of potential energy of 5.15 J and impact speed of 1.7 m / sec to the sample (length: 300 mm), the sample was cut Is measured using a 10 kg load cell, and is obtained by reading the height of the peak appearing on the chart of the visual graph, and the strength (cN / dtex) is calculated by dividing the strength by the fineness. It showed by the average value of the measurement.
(5) Spinning property Continuous spinning for 24 hours was performed, and the following criteria were used.

○: There was no more than one draw break during yarn production,
X: Two or more stretch breaks occurred during yarn production.
(6) Weaving evaluation Weft driving evaluation was performed and judged according to the following criteria.

  Using PPS monofilaments as wefts, a double woven papermaking dryer canvas was prepared. When weaving this dryer canvas 5 m in the length direction, the yarn breakage condition at the time of weft driving was confirmed and judged according to the following criteria.

  ○: The thread breakage at the time of weft driving was less than once.

X: The yarn breakage occurred twice or more when the weft was driven.
[Example 1]
PPS pellets E2080 (MFR = 90 g / 10 min) manufactured by Toray Industries, Inc., which was dried under vacuum conditions at 150 ° C. for 15 hours, was prepared as a PPS raw material. This was supplied to an extruder type spinning machine, melted and kneaded at a spinning machine temperature of 330 ° C., extruded from a spinneret, and immediately cooled and solidified in warm water at 80 ° C. to obtain an undrawn PPS yarn. Subsequently, the above-mentioned undrawn yarn was stretched to the first stage by 3.60 times in a temperature atmosphere of 100 ° C., and further, the second stage drawing was conducted by 1.25 times in a temperature atmosphere of 130 ° C. Then, heat setting was performed at a magnification of 0.95 under a temperature atmosphere of 180 ° C. to obtain a PPS monofilament having a diameter of 0.400 mm.

Table 1 shows the results of tensile strength, tensile elongation, tensile strength, impact breaking strength, yarn cracking durability test, yarn forming property and weaving evaluation of the obtained PPS monofilament [Example 2 and Comparative Examples 1-2]
The same spinning process as in Example 1 was used, and the cooling temperature was changed as shown in Tables 1 and 2 to obtain a PPS monofilament having an approximate diameter of 0.40 mm. Tensile strength, tensile elongation, hook strength, impact breaking strength, yarn cracking durability, yarn-making property and weaving evaluation of the obtained PPS monofilament (hereinafter, tensile strength, tensile elongation, hooking strength, impact breaking strength, yarn cracking durability) Table 1 and Table 2 show the evaluation results of properties, yarn-making properties and weaving evaluation).
[Examples 3 to 4 and Comparative Examples 3 to 5]
Using the same spinning process as in Example 1, the first-stage stretching temperature and the second-stage stretching temperature were changed as shown in Tables 1 and 2, and PPS monofilaments having an approximate diameter of 0.40 mm were obtained. Tables 1 and 2 show the evaluation results of the obtained PPS monofilament.
[Examples 5-6 and Comparative Examples 6-8]
Using the same spinning process as in Example 1, the first stage draw ratio and the second stage draw ratio were changed as shown in Tables 1 and 2, and PPS monofilaments having an approximate diameter of 0.40 mm were obtained. Tables 1 and 2 show the evaluation results of the obtained PPS monofilaments.
[Examples 7 to 8 and Comparative Examples 9 to 10]
Using the same spinning process as in Example 1, the temperature and magnification at the time of heat setting were changed as shown in Tables 1 and 2, and PPS monofilaments having an approximate diameter of 0.40 mm were obtained. Tables 1 and 2 show the evaluation results of the obtained PPS monofilament.

As is clear from the results in Table 1, the PPS monofilament of the present invention has excellent tensile strength, hook strength, impact breaking strength, yarn-making property and good weaving property. It can be seen that the PPS monofilament used for the application can be used very suitably.

  On the other hand, as is clear from the results in Table 2, PPS monofilaments that do not satisfy the provisions of the present invention do not satisfy the characteristics as PPS monofilaments for industrial textile use, and have woven properties such as thread cutting in the weaving process. Unfortunately, it became unpreferable as a PPS monofilament for industrial textile use.

  That is, in Comparative Example 1 in which the cooling temperature was too low, bubbles called voids were generated in the undrawn PPS monofilament yarn due to the cooling temperature that was too low, resulting in three yarn breaks during 24 hours of yarn production. In addition, the tensile strength and impact strength were lowered due to the influence of voids, leading to an undesirable result of frequent yarn breakage in the weaving evaluation.

  In Comparative Example 2 in which the cooling temperature was too high, the PPS monofilament unstretched yarn led to the cooling process caused boiling water of the cooling solvent to boil on the melted PPS unstretched yarn, and the surface of the obtained PPS monofilament had many Not only unevenness was generated, but the impact breaking strength was lowered due to the influence of the unevenness, and even in the weaving evaluation, the yarn breakage was sporadic, resulting in a very undesirable result.

  In Comparative Example 3 in which the first-stage stretching temperature was too high, superdraw occurred due to the influence of the first-stage stretching temperature that was too high, and all of the tensile strength, tensile elongation, and impact rupture strength satisfied the provisions of the present invention. It became nothing. Further, from the results of Comparative Examples 1 and 2, if the impact breaking strength is too low, yarn breakage occurs in the weaving evaluation. Therefore, the weaving evaluation of Comparative Example 3 was not evaluated. Henceforth, the weaving evaluation of the comparative example whose impact fracture strength does not satisfy the provisions of the present invention was not evaluated.

  In Comparative Example 4 in which the second stage stretching temperature is too low, the spinning performance is poor, for example, the stretching breakage occurs 6 times during 24 hours of spinning, and the hook strength and impact breaking strength are also reduced. It became unsuitable as a PPS monofilament. Further, in Comparative Example 5 in which the second stage stretching temperature was too high, the tensile strength and impact rupture strength were low. It became insufficient as a PPS monofilament for industrial textile use.

  Furthermore, in Comparative Example 6, the first stage draw ratio is too high, resulting in a PPS monofilament having a low impact breaking strength, and the first stage draw ratio is too high, resulting in three breaks during 24 hours of yarn production. Further, the yarn forming property was not preferable.

  Further, in Comparative Example 7 in which the total draw ratio was too lower than the regulation of the present invention, the tensile strength of the obtained PPS monofilament was low, and the yarn breakage occurred due to the tensile strength being too low even during weaving. It became a thing lacking in process passage nature.

  In Comparative Example 8 in which the total draw ratio was too higher than the provisions of the present invention, the spinning performance was poor, such as seven draw breaks during 24-hour spinning, and the resulting PPS monofilament had a tensile elongation, a catching strength and an impact. The properties of breaking strength were all low, and the PPS monofilament for industrial textiles did not satisfy the required properties.

  In Comparative Example 9 in which the heat setting temperature was too higher than the definition of the present invention, the stretching orientation was greatly relaxed due to the influence of the heat setting temperature that was too high, and the tensile strength and impact rupture strength were reduced. Moreover, in Comparative Example 10 in which the heat setting magnification was too low, the relaxation rate during heat setting was too large, and as in Comparative Example 9, the stretching orientation was greatly relaxed, resulting in a decrease in strength characteristics. It was not suitable as a PPS monofilament for textile use.

  The PPS monofilament of the present invention has excellent strength characteristics, impact resistance, and proper elongation characteristics, and exhibits stable process passage when weaving industrial textiles. It can be said that it is extremely suitable as a constituent material.

Claims (5)

A monofilament made of polyphenylene sulfide having a tensile strength measured according to JIS L1013: 2008 of 2.00 cN / dtex or more, a tensile elongation of 15% or more and 70% or less, and a hook strength measured according to the same standard of 2 The impact breaking strength was 1.80 cN / dtex which was calculated by dividing the strength when the monofilament was cut by the fineness by applying a force of energy 5.15 J and impact speed 1.7 m / sec. A polyphenylene sulfide monofilament characterized by the above. An undrawn yarn obtained by melt-extrusion of polyphenylene sulfide and cooling and solidification in warm water of 65 ° C. to 95 ° C. in a temperature atmosphere of 90 ° C. to 110 ° C. is 3.20 times to 4.00 times. First-stage stretching is performed in the following range, and further, second-stage stretching is performed in a temperature range of 1.00 times to 1.50 times in a temperature atmosphere of 100 ° C. to 260 ° C., and the total stretching ratio is 4.00 times to 4 times. The polyphenylene sulfide monofilament is characterized in that it is stretched to 80 times or less, and then heat-set in a temperature atmosphere of 100 ° C. or more and 270 ° C. or less in a range of 0.80 times or more and 1.00 times or less. Method. An industrial fabric, wherein the polyphenylene sulfide monofilament according to claim 1 is used for at least a part of warp and / or weft. The industrial fabric according to claim 3, which is a papermaking fabric. The industrial fabric according to claim 3 or 4, which is a papermaking dryer canvas.