Polyphenylene sulfide monofilament, method for producing the same, and fiber package

Abstract

The present invention provides a polyphenylene sulfide monofilament, characterized in that the main structural unit is a phenylene sulfide unit, which satisfies (1) to (5): (1) the fineness is 6 to 35 dtex; (2) the breaking strength is above 3.4 cN / dtex; (3) the breaking elongation is 24 to 45%; (4) the 5% modulus is 1.0 to 1.6 cN / dtex; and (5) the 10% modulus is 1.4 to 2.3 cN / dtex.

Description

Technical Field

[0001] The present invention relates to a polyphenylene sulfide monofilament and a method for producing the same, and a fiber package. This application claims priority based on Japanese Patent Application No. 2021-062433 filed on March 31, 2021, Japanese Patent Application No. 2021-062434 filed on March 31, 2021, and Japanese Patent Application No. 2021-065544 filed on April 7, 2021, and all the contents described in the above Japanese patent applications are cited. Background Art

[0002] Considering the aspects of chemical resistance, dimensional stability, and thermal durability, mesh fabrics made of polyphenylene sulfide, polyvinylidene fluoride, liquid crystal polyester, etc. are now mostly used in industrial filters. In particular, mesh fabrics made of polyphenylene sulfide have excellent chemical resistance, dimensional stability, and cost-effectiveness, and are suitable for fields requiring high filtering performance, so they are widely used. In addition, in recent years, due to the very low productivity of fine monofilaments, it is also expected to reduce costs by shortening the process using the direct spinning and stretching method.

[0003] Patent Document 1 describes a polyphenylene sulfide monofilament characterized by a fineness of 25 dtex or less, a strength of 3.0 cN / dtex or more, an elongation of less than 30%, etc., and describes that a conventional method is used as a method for producing the monofilament.

[0004] Patent Documents 2 and 3 describe drum-shaped packages formed of polyphenylene sulfide monofilaments obtained by a direct spinning and stretching method in which the obtained unstretched yarn is not temporarily wound but continuously stretched and wound by a winder.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 4844515

[0008] Patent Document 2: International Publication No. WO2016 / 104236

[0009] Patent Document 3: Japanese Patent Application Publication No. 2017-101365 Summary of the invention

[0010] Technical problem to be solved by the invention

[0011] However, in the case of polyphenylene sulfide monofilaments with an elongation of less than 30% as described in Patent Documents 1 to 3, it is sometimes easy to cause wire breakage during spinning and warp breakage during weaving. This has become the main reason for the poor yield and performance degradation of mesh fabrics. In addition, when winding a thin weft bobbin yarn and a monofilament with an elongation close to 20% as described in Patent Document 1, the 5% modulus and / or 10% modulus increase, so there is a possibility of weft shrinkage and quality damage when the innermost layer of the weft bobbin is unwound. In addition, in the case of drum-shaped packages such as those described in Patent Documents 2 and 3, the yarn may fall off the end surface of the reel (thread drop), resulting in poor unwinding of the yarn, or the yarn roll may collapse. It may also cause problems during weaving on the reel with thread drop.

[0012] Therefore, an object of the present invention is to obtain a polyphenylene sulfide monofilament which is not easily broken, is not easily broken or contracted when the yarn roll is unwound, is easy to handle during weaving, has high quality and fine fineness.

[0013] Another object of the present invention is to obtain a high-quality polyphenylene sulfide monofilament fiber package capable of suppressing the occurrence of thread breakage, yarn skipping, streaks, etc. during weaving.

[0014] In addition, another object of the present invention is to obtain the above-mentioned polyphenylene sulfide monofilament with good production efficiency by direct spinning and drawing method.

[0015] Technical solutions for solving technical problems

[0016] The inventors of the present invention have found that, in polyphenylene sulfide monofilaments, by setting the heat setting temperature and winding tension within a specific range and limiting the package of the reel, a monofilament having a specific fineness, breaking strength, breaking elongation, 5% modulus, and 10% modulus can be obtained. In addition, the monofilament has better spinning operability than conventional products, and the yarn roll of the reel is prevented from falling apart, the occurrence of shrinkage during unwinding is improved, and the monofilament can be easily handled during weaving and has high quality.

[0017] That is, a first aspect of the present invention relates to a polyphenylene sulfide monofilament characterized in that a main structural unit is a phenylene sulfide unit and the following (1) to (5) are satisfied.

[0018] (1) Denier is 6 to 35 dtex;

[0019] (2) Breaking strength of 3.4 cN / dtex or more;

[0020] (3) Elongation at break is 24-45%;

[0021] (4) 5% modulus is 1.0 to 1.6 cN / dtex;

[0022] (5) 10% modulus is 1.4 to 2.3 cN / dtex.

[0023] A second aspect of the present invention relates to a weft tubular fiber package formed of the polyphenylene sulfide monofilament.

[0024] The third embodiment of the present invention relates to the above-mentioned polyphenylene sulfide monofilament fiber package, which has a roll width of 100 to 250 mm, a taper angle of 30 to 140°, a winding angle of 0.6 to 2°, and a ratio of the thermal shrinkage stress values ​​of the innermost layer and the outermost layer of the package (thermal shrinkage stress ratio of the innermost and outermost layers) of 0.85 to 1.15.

[0025] A fourth aspect of the present invention relates to a method for producing the above-mentioned polyphenylene sulfide monofilament, characterized in that: the polyphenylene sulfide monofilament is produced by a direct spinning and stretching method, wherein the main structural unit of the above-mentioned polyphenylene sulfide monofilament is a phenylene sulfide unit, and the above-mentioned direct spinning and stretching method is to melt and extrude the polyphenylene sulfide resin and cool and solidify it, and then the obtained unstretched yarn is not temporarily wound but is continuously stretched and wound by a winder, and the production method satisfies the following (1) to (4).

[0026] (1) The MFR of polyphenylene sulfide resin is 100 to 250 g / 10 min;

[0027] (2) when stretching the unstretched yarn, use an unheated pre-tensioning roller and two or more heated godet rollers for stretching;

[0028] (3) The temperature of the first godet roller is 95 to 120° C., and the heat setting temperature of the heating godet rollers after the second godet roller is 120 to 250° C.;

[0029] (4) The winding tension of the winder is 0.1 to 0.5 cN / dtex.

[0030] A fifth aspect of the present invention relates to a method for producing the above-mentioned fiber package, characterized in that: a fiber package formed of polyphenylene sulfide monofilaments is produced by a direct spinning and stretching method, wherein the main structural unit of the above-mentioned polyphenylene sulfide monofilaments is a phenylene sulfide unit, and the above-mentioned direct spinning and stretching method is to melt-extrude the polyphenylene sulfide resin and cool it to solidify, and then the obtained undrawn yarn is not temporarily wound but is continuously stretched and wound onto a reel by a winder, and the production method satisfies the following (1) to (4).

[0031] (1) The MFR of polyphenylene sulfide resin is 100 to 250 g / 10 min;

[0032] (2) when stretching the unstretched yarn, use an unheated pre-tensioning roller and two or more heated godet rollers for stretching;

[0033] (3) The temperature of the first godet roller is 95 to 120° C., and the heat setting temperature of the heating godet rollers after the second godet roller is 120 to 250° C.;

[0034] (4) The winding tension of the winder is 0.1 to 0.5 cN / dtex.

[0035] A sixth aspect of the present invention relates to a method for producing a fiber package formed of polyphenylene sulfide monofilaments, wherein the fiber package formed of polyphenylene sulfide monofilaments is produced by a direct spinning and stretching method, wherein the main structural unit of the polyphenylene sulfide monofilaments is a phenylene sulfide unit, and the direct spinning and stretching method is to melt-extrude the polyphenylene sulfide resin and cool and solidify it, and then the obtained unstretched yarn is not temporarily wound but is continuously stretched and wound on a weft yarn tubular reel at a winding tension of 0.1 to 0.5 cN / dtex to a winder.

[0036] The seventh aspect of the present invention relates to a method for producing the above-mentioned fiber package formed of polyphenylene sulfide monofilaments, characterized in that grease is attached to the obtained undrawn yarn in such a manner that the grease adhesion rate of the polyphenylene sulfide monofilaments is 0.15 to 0.5% by mass, and then the undrawn yarn is drawn and wound on a reel.

[0037] The eighth aspect of the present invention relates to a method for producing a fiber package formed of polyphenylene sulfide monofilaments, characterized in that: a fiber package formed of polyphenylene sulfide monofilaments is produced by a direct spinning and stretching method. In the above-mentioned direct spinning and stretching method, after the polyphenylene sulfide resin is melt-extruded and cooled and solidified, the obtained undrawn yarn is not temporarily wound but is continuously stretched and wound on a weft yarn tubular reel by a winder. Before the undrawn yarn is wound on the reel, grease is supplied in such a manner that the grease adhesion rate of the polyphenylene sulfide monofilament is 0.15 to 0.5% by mass, and the undrawn yarn is wound on the reel in a weft yarn tubular shape with a winding width of 100 to 250 mm, a taper angle of 30 to 140 degrees, and a winding angle of 0.6 to 2 degrees.

[0038] The ninth aspect of the present invention relates to a polyphenylene sulfide monofilament weft tubular fiber package having a winding width of 100 to 250 mm, a taper angle of 30 to 140°, a winding angle of 0.6 to 2°, and a heat shrinkage stress ratio of the innermost and outermost layers of 0.85 to 1.15.

[0039] Effects of the Invention

[0040] According to the polyphenylene sulfide monofilament of the present invention, it is possible to obtain a high-quality mesh fabric which is less likely to break during spinning, has good spinning operability, and is excellent in mesh strength and durability.

[0041] In addition, a polyphenylene sulfide monofilament which is particularly suitable for a package in a weft tube shape can be obtained.

[0042] Furthermore, according to the fiber package of the present invention, a high-quality polyphenylene sulfide monofilament fiber package can be obtained in which the yarn winding state is good and yarn breakage, yarn skipping, streaking, etc. during weaving can be suppressed.

[0043] The present invention can also obtain the polyphenylene sulfide monofilament with good production efficiency by using a direct spinning and drawing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic plan view of the polyphenylene sulfide monofilament fiber package of the present invention. DETAILED DESCRIPTION

[0045] The present invention is described in detail below.

[0046] The polyphenylene sulfide resin of the present invention is a polyphenylene sulfide formed of a polymer having a phenylene sulfide unit as a main repeating unit (main structural unit). Examples of the phenylene sulfide unit include a p-phenylene sulfide unit and a m-phenylene sulfide unit. The polyphenylene sulfide may be a homopolymer formed of a p-phenylene sulfide unit or a m-phenylene sulfide unit, or a copolymer having them. From the viewpoints of heat resistance, processability, and economy, a p-phenylene sulfide repeating unit is preferred. In the polyphenylene sulfide resin, the p-phenylene sulfide repeating unit preferably contains 50 mol% or more, more preferably 70 mol% or more, particularly preferably 90 mol% or more, and further preferably 98 mol% or more.

[0047] Polyphenylene sulfide polymer types include a cross-linked type, a semi-cross-linked type, and a linear type. The linear type is preferred in terms of spinning and stretching properties.

[0048] In addition, within the range not impairing the effects of the present invention, polyphenylene sulfide may contain small amounts of various additives such as various metal oxides, kaolin, silica and other inorganic substances, colorants, matting agents, flame retardants, antioxidants, ultraviolet absorbers, infrared absorbers, crystal nucleating agents, fluorescent brighteners, end-capping agents, solubilizing agents, and the like.

[0049] The melt flow rate (MFR) of the polyphenylene sulfide resin of the present invention is preferably 100 to 250 g / 10 min. More preferably, it is 130 to 200 g / 10 min. When it is less than 100 g / 10 min, the viscosity is too high, which will hinder spinning. In addition, when it exceeds 250 g / 10 min, the viscosity is very low and the strength of the fiber decreases. Therefore, when it is used for a mesh fabric such as a filter, the strength and durability are greatly reduced, and it is not suitable for commercialization.

[0050] The moisture content of the pellets of the polyphenylene sulfide resin of the present invention before spinning is preferably 100 ppm or less, more preferably 10 to 50 ppm. If it exceeds 100 ppm, it may cause thread breakage during spinning or cause mixing of bubbles, resulting in reduced spinning operability.

[0051] The pellets of the polyphenylene sulfide resin of the present invention are preferably subjected to vacuum drying as pre-drying to remove low molecular weight components as much as possible. When pre-drying is performed, the drying temperature is preferably 130 to 190° C. and the drying time is preferably 6 to 12 hours.

[0052] The cross-sectional shape of the polyphenylene sulfide monofilament of the present invention is not particularly limited. The outer shape of the polyphenylene sulfide monofilament of the present invention is preferably circular.

[0053] The fineness of the polyphenylene sulfide monofilament of the present invention is preferably 6 to 35 dtex. If it exceeds 35 dtex, solidification by cold air becomes difficult, and it is difficult to obtain high-quality monofilaments, which causes problems when making products such as filters.

[0054] From the viewpoint of durability of the mesh of a filter or the like, the breaking strength of the polyphenylene sulfide monofilament of the present invention is 3.4 cN / dtex or more, more preferably 3.8 cN / dtex or more. The upper limit is preferably 5 cN / dtex or less.

[0055] The elongation at break of the polyphenylene sulfide monofilament of the present invention is 24 to 45%, preferably 24 to 40%. It is more preferably 30 to 40%, and further preferably 30 to 35%. When the elongation at break is less than 24%, the yarn breaks frequently during spinning, and reed grinding occurs during weaving, resulting in reduced weaving properties. When the elongation at break exceeds 45%, the amorphous portion of the filament increases, resulting in poor dimensional stability of the mesh and reduced durability.

[0056] The 5% modulus of the polyphenylene sulfide monofilament of the present invention is 1.0 to 1.6 cN / dtex, preferably 1.2 to 1.6 cN / dtex. From the viewpoint of mesh durability, a higher 5% modulus is preferred, but when it exceeds 1.6 cN / dtex, shrinkage occurs when the inner layer of the roll is unwound, and a good quality mesh cannot be obtained. When it is less than 1.0 cN / dtex, the dimensional stability and strength durability of the mesh deteriorate, and mesh displacement is likely to occur.

[0057] The 10% modulus of the polyphenylene sulfide monofilament of the present invention is 1.4 to 2.3 cN / dtex, preferably 1.7 to 2.1 cN / dtex. From the viewpoint of mesh durability, a higher 10% modulus is preferred, but when it exceeds 2.3 cN / dtex, shrinkage occurs when the inner layer of the roll is unwound, and a mesh of good quality cannot be obtained. When it is less than 1.4 cN / dtex, the dimensional stability and strength durability of the mesh deteriorate, and mesh displacement is likely to occur.

[0058] The polyphenylene sulfide monofilament as described above can eliminate shrinkage during unwinding and is therefore easy to handle during weaving.

[0059] The hot water shrinkage of the polyphenylene sulfide monofilament of the present invention is preferably 10% or less. More preferably, it is 2 to 8%. From the viewpoint of the dimensional stability of the mesh, a low hot water shrinkage is preferred. If it exceeds 10%, there is a tendency for the dimensional stability of the mesh to deteriorate, and there is a risk of becoming a filter of poor quality.

[0060] In the weft tubular fiber package of the polyphenylene sulfide monofilament of the present invention, the ratio of the heat shrinkage stress value of the filaments present in the innermost layer of the fiber package to the heat shrinkage stress value of the filaments present in the outermost layer of the package (referred to as the heat shrinkage stress ratio of the innermost and outermost layers) is preferably 0.85 to 1.15. It is more preferably 0.9 to 1.1. When the heat shrinkage stress ratio of the innermost and outermost layers is outside this range, it becomes one of the causes of yarn collapse or yarn tension, and the mesh material is deformed due to the stress difference, which may result in a mesh material of poor quality.

[0061] From the perspective of the post-process passability of the polyphenylene sulfide monofilament of the present invention and the aspect of obtaining a mesh fabric with good quality, the grease adhesion rate is preferably 0.15 to 0.5 mass%. It is more preferably 0.15 to 0.45 mass% or 0.2 to 0.5 mass%, and further preferably 0.25 to 0.35 mass%. When it is less than 0.15 mass%, static electricity is easily generated, and there is a tendency for the operability of weaving to deteriorate. When it exceeds 0.5 mass%, there is a tendency for yarn skipping to occur during weaving, which affects the quality of mesh fabrics and industrial filters and may become the cause of the collapse of the reel in the spinning winding process.

[0062] As a preferred oil agent for the polyphenylene sulfide monofilament of the present invention, from the perspective of smoothness and prevention of reed friction, a fatty acid ester-based smoothing agent of 30% by mass or more may be contained. In addition, an antistatic agent and an emulsifier may be appropriately added. In addition, it is further preferred to add 1 to 3% by mass of modified silicone relative to the oil agent stock solution to further improve the smoothness. If such modified silicone is added in excess, the yarn may slip in the reel during winding, which may cause the yarn to collapse, so the above range is preferred. As a preferred method for supplying the oil agent, a 5 to 20% by mass emulsion made of ion exchange water can be cited, and then supplied directly above the pre-tensioning roller using an oiling nozzle.

[0063] As a method for producing the polyphenylene sulfide monofilament of the present invention, the monofilament is obtained by stretching after spinning. In this case, the monofilament can be produced by a direct spinning stretching method, a conventional method, or the like. Alternatively, a method of producing a monofilament by dividing a mother yarn formed of a multifilament obtained by a direct spinning stretching method may be adopted. In consideration of the production process, cost, and shrinkage during unwinding, the monofilament is preferably produced by a direct spinning stretching method.

[0064] The polyphenylene sulfide monofilament of the present invention can be obtained by passing through a spinning step of melt-extruding the polyester phenylene sulfide resin and then passing through a stretching step of stretching and winding using a non-heated pretension roll and two or more heated godet rolls.

[0065] Hereinafter, a preferred embodiment of the production method will be described in detail.

[0066] In the spinning process, the polyphenylene sulfide resin melted by the extruder is metered, and oil is supplied to the filaments extruded from the nozzle. Thereafter, the stretching process is carried out immediately after the spinning process. In the stretching process, stretching is carried out using a plurality of godet rollers, crystallization is fully performed, the fiber structure is fixed, and a drawn filament is obtained. In the stretching process, a relaxation process for reducing the heat shrinkage rate of the drawn filament may also be introduced. In this case, from the viewpoint of easily preventing shrinkage, the relaxation rate of the relaxation process is preferably 0 to 2%. The more preferred range of the relaxation rate is 0 to 1%. When the relaxation rate is less than 0%, the tension between the rollers in the stretching process increases, so the orientation of the amorphous part becomes high, and it is easy to shrink multiple times or the yarn roll of the reel is tight. When the relaxation rate exceeds 2%, the orientation of the amorphous part decreases, so there is a risk that it is difficult to obtain a high-quality monofilament whose 5% modulus and 10% modulus meet the above range and whose breaking strength and breaking elongation are within the range of the present invention. There is also a risk that the filament is relaxed and cannot be wound.

[0067] In addition, in the stretching process, in order to eliminate the bending, it is preferred to implement pre-stretching with a stretching ratio of 1.01 to 1.05 between the pre-tensioning roller and the godet roller 1, and then perform the main stretching after the godet roller 1. In the main stretching, it is preferred to set the temperature of the godet roller 1 to 95 to 120°C for stretching. More preferably, it is 100 to 115°C. After that, it is guided to the godet roller 2, and heat-set and stretch are performed by the godet roller 2. The heat-setting temperature of the godet roller 2 is preferably 120 to 250°C, and more preferably 130 to 200°C. After that, it can also be guided to new godets 3 and 4 for stretching. A relaxation process can also be set as described above to perform relaxation treatment. In addition, when heat-setting is further performed using the godet roller after the godet roller 3, it is preferably 120 to 250°C, and more preferably 130 to 200°C. The godet rollers after the godet roller 3 can also be non-heated rollers without heat setting. After passing through each roller, the filament is wound up by a winder. The winding tension when winding up on the winder is preferably 0.1 to 0.5 cN / dtex, and more preferably 0.2 to 0.3 cN / dtex.

[0068] In addition, when the temperature of the godet roller 1 is less than 95°C, knots are often formed on the yarn, and the yarn on the godet roller often breaks due to shaking. In addition, when it exceeds 120°C, the yarn on the godet roller often shakes, breaks, and it is difficult to normally collect the monofilament. When the temperature of the godet roller for heat setting after the godet roller 2 is less than 120°C, it is difficult to obtain the monofilament of the present invention. In addition, when it exceeds 250°C, there is a tendency for the monofilament to melt due to heat, making it difficult to wind the monofilament.

[0069] When the winding tension to the winder is less than 0.1 cN / dtex, the tension between the godet roller and the winder is too low, so the yarn roll of the reel is often broken and broken, and it is difficult to obtain monofilaments normally. When it exceeds 0.5 cN / dtex, the yarn roll of the reel is tight, and it is difficult to remove the reel from the winder.

[0070] As the roll shape of the polyphenylene sulfide monofilament of the present invention, a weft tube shape is preferably formed by winding the polyphenylene sulfide monofilament in a cone shape on a paper tube commonly used in the direct spinning and stretching method. Usually, it is a drum shape in the direct spinning and stretching method, but in the case of a drum shape, the yarn is likely to fall off the end surface of the roll when winding the monofilament (thread drop), and in severe cases, the yarn roll collapses. In the case of thread drop, the yarn hangs on the end surface during unwinding, causing thread breakage or weaving defects, which may lead to a decrease in process performance or a decrease in product quality.

[0071] As the winding condition of the fiber package formed by the polyphenylene sulfide monofilament of the present invention, the winding width of the innermost layer of the fiber package is 100 to 250 mm. More preferably, it is 150 to 200 mm. When the winding width is less than 100 mm, the winding amount cannot be increased unless the cone angle is increased. Once the cone angle is too high, the yarn will fall off the end face of the drum (the yarn will fall off), and the yarn will be caught during unwinding, causing broken wires or stripes, resulting in poor weaving properties. Considering that there are limits to the single yarn count and the length of the winding machine, the upper limit of the winding width can be 250 mm in terms of productivity and cost of the fiber package.

[0072] The taper angle of the fiber package of the present invention is 30 to 140°. More preferably, it is 45 to 100°. When the taper angle is less than 30°, the yarn roll will not fall apart. However, before the normal amount of roll is wound up, the roll width at both ends increases with the increase in roll thickness, and the two ends approach and touch each other, and the target amount may not be wound, resulting in poor productivity. When the taper angle exceeds 140°, the yarn falls off the taper, and there is a tendency for the yarn roll to fall apart. For reference only, under the condition of 180° (equivalent to a drum-type yarn roll), yarn roll collapse due to falling yarn occurs frequently.

[0073] The winding angle of the fiber package of the present invention is 0.6 to 2°, preferably 0.8 to 2°. More preferably, it is 0.9 to 1.2°. When the winding angle is less than 0.6°, strips of yarn are attached to the surface of the package, resulting in poor unwinding of the roll and poor appearance. When the winding angle exceeds 2°, when the traverse rod moves the yarn at both ends, the yarn is ejected due to kinetic energy, causing the yarn to fall from the cone, and sometimes the yarn roll collapses. This phenomenon is prone to occur frequently, especially when the fineness of the filament is 20 dtex or more.

[0074] Example

[0075] The present invention will be described in detail below with reference to Examples. However, the present invention is not limited to the Examples described below. The physical properties and evaluation of the filaments of the Examples are as follows.

[0076] A.MFR

[0077] The MFR value was measured under the conditions of a temperature of 315.5°C and a load of 5,000 g in accordance with JIS K-7210 (1999).

[0078] B. Fineness

[0079] According to JIS-L-1013, a length measuring machine with a frame circumference of 1.125 m was used to wind the sample at a speed of 120 times / min, and the mass was weighed to determine the fineness. This measurement was performed 5 times and the average value was determined.

[0080] C. Breaking strength, breaking elongation, 5% modulus, 10% modulus

[0081] According to JIS L 1013, the AGS-1KNG Autograph (registered trademark) tensile tester manufactured by Shimadzu Corporation was used to measure the sample yarn length of 20 cm and the constant tensile speed of 20 cm / min. The value obtained by dividing the maximum value of the load in the load-elongation curve by the fineness was taken as the breaking strength (cN / dtex), the elongation at this time was taken as the breaking elongation (%), the strength at the elongation of 5% was taken as the 5% modulus (cN / dtex), and the strength at the elongation of 10% was taken as the 10% modulus (cN / dtex).

[0082] D. Thermal shrinkage stress ratio of the inner and outer layers

[0083] The thermal shrinkage stress is measured using a KE-II type shrinkage stress measuring device manufactured by Kanebo Engineering. For a sample with the wire ends knotted into a ring with a length of 5 cm, an initial load of fineness × 2 / 30 (cN) is applied, and the thermal shrinkage force is measured when heated at a heating rate of 120°C / min from room temperature. The highest point of the measured thermal shrinkage force is taken as the peak value of the thermal shrinkage force (cN), and the temperature at this time is taken as the peak temperature of the thermal shrinkage force (°C). In addition, the highest value of the above-mentioned thermal shrinkage force is divided by twice the fiber fineness, and the obtained value is taken as the thermal shrinkage stress (cN / dtex). The measurement is performed 5 times, and the average value is taken as the thermal shrinkage stress. The thermal shrinkage stress ratio (Sr) of the innermost and outermost layers is calculated using the following formula 1.

[0084] Sr=Si / So ···Formula 1

[0085] (Sr: thermal shrinkage stress ratio of the innermost and outermost layers; Si: thermal shrinkage stress of the innermost layer of the package [measured from the outer diameter of the paper tube at a point where the roll thickness is 1 mm]; So: thermal shrinkage stress of the outermost layer of the package [measured at a point 1 minute after the surface layer of the package is unwound])

[0086] E. Spinning operability

[0087] The spinning workability was evaluated as "○" if the process passability was good, "△" if the process passability was slightly poor, and "×" if the spinning was impossible.

[0088] F. Yarn winding state of fiber package

[0089] The winding workability was evaluated as "○" if the yarn roll shape was good, "△" if the yarn roll was slightly loose or the amount of winding was insufficient, and "×" if the yarn roll was severely loose or could not be wound.

[0090] G. Weavability and Appearance Evaluation

[0091] The obtained polyphenylene sulfide monofilament was used to weave mesh fabrics of 420 mesh (threads / 2.54 cm) (6 or more and less than 11 dtex), 225 mesh (threads / 2.54 cm) (11 or more and less than 21 dtex), and 150 mesh (threads / 2.54 cm) (21 to 35 dtex) at a rotation speed of 300 rpm using a Sulzer loom. At this time, the weaving properties such as the occurrence of reed yarn skipping and the state of warp or weft yarn breakage and the appearance of the obtained fabric (thick places, shrinkage, streaks, etc.) were evaluated.

[0092] Regarding the evaluation, if both the weavability and the appearance were good, it was evaluated as "○", if either one was poor, it was evaluated as "△", and if both were poor, it was evaluated as "×".

[0093] H. Mesh Performance Evaluation

[0094] The obtained mesh fabric of polyphenylene sulfide was heat-set at 160°C for 20 minutes, and the processed mesh fabric (before and after heat-setting) was subjected to an elongation recovery cycle to evaluate the appearance. Regarding the elongation recovery cycle, according to JIS L 1013, an AGS-1KNG Autograph (registered trademark) tensile testing machine manufactured by Shimadzu Corporation was used to perform 5 10% elongation recovery cycles under the conditions of a sample length of 20 cm, a width of 5 cm, and a constant tensile speed of 20 cm / min. The appearance of the mesh fabric at this time was observed by visual inspection. The situation where there was no mesh dislocation, deformation, or damage was evaluated as "0", the situation where there was deformation and slight damage was evaluated as "×", and the situation where it was impossible to judge whether there was deformation or damage was evaluated as "△".

[0095] I. Comprehensive Evaluation

[0096] For the four items of spinning operability, yarn winding state, weaving property, appearance evaluation, and mesh performance, the case where all of them were judged as 0 was evaluated as a comprehensive evaluation of "◎". The case where the spinning operability was 0 and the mesh performance was 0 or △ was evaluated as a comprehensive evaluation of "○". In the examples other than the examples with the comprehensive evaluation of "◎" or "○", the case where two or more of the spinning operability, weaving property, appearance evaluation, and mesh performance were "△" was evaluated as a comprehensive evaluation of "△". The case where any one of the spinning operability and mesh performance was "×" was evaluated as a comprehensive evaluation of "×".

[0097] J. Package Evaluation

[0098] Regarding the yarn winding state, weaving property, and appearance evaluation, the case where all of them were 0 was evaluated as "0", the case where any one of them was × was evaluated as "×", and the other cases were evaluated as "△".

[0099] [Example 1]

[0100] A polyphenylene sulfide resin (water content: 20 ppm) having an MFR of 160 g / 10 min was prepared and melted at a spinning temperature of 328° C. Using a spinning die having two holes (L / D=0.65 mm / 0.65 mm), the molten polyphenylene sulfide was discharged in an amount to give a fineness of 33 dtex after stretching. The discharged polyphenylene sulfide yarn was cooled by a direct-flow cooling device, and an emulsion oil (OPU = 0.3 mass%) was supplied. Then, the yarn was wound on a non-heated pre-tensioning roller at a speed of 1,040 m / min, and tension was applied between godet rollers 1 (speed 1,058 m / min, 115° C.). Then, main stretching and heat setting were performed by godet rollers 2 (speed 3,520 m / min, 135° C.), and relaxation treatment was performed by godet rollers 3 (speed 3,500 m / min, non-heating) to relax the tension. The yarn was then wound on a winder (speed 3,495 m / min) at a winding tension of 0.2 cN / dtex, and a 33 dtex polyphenylene sulfide monofilament was wound on a weft tube-shaped reel having a tapered end face at a winding width of 200 mm, a taper angle of 60°, and a winding angle of 1°.

[0101] [Example 2]

[0102] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 1 except that the speed of the pretension roller was set to 920 m / min, the speed of the godet roller 1 was set to 960 m / min, the speed of the winder was changed, and the godet roller 3 was not used.

[0103] [Comparative Examples 1 and 2]

[0104] In Comparative Example 1, a polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2 except that the temperature of the godet roller 2 was changed. Comparative Example 2 was carried out under the same conditions.

[0105] [Comparative Examples 3 and 4]

[0106] In Comparative Example 4, a polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2 except that the speed and winding tension of the winder were changed. Comparative Example 3 was carried out under the same conditions.

[0107] [Comparative Example 5]

[0108] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 1 except that a polyphenylene sulfide resin having an MFR of 300 g / 10 min was used and the speeds of the pretension roller and the godet roller 1 were changed.

[0109] [Comparative Example 6]

[0110] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2 except that a polyphenylene sulfide resin having an MFR of 65 g / 10 min was used and the speeds of the pretension roller and the godet roller 1 were changed.

[0111] [Example 3]

[0112] A polyphenylene sulfide resin having an MFR of 160 g / 10 min was prepared and melted at a spinning temperature of 328° C. The molten polyphenylene sulfide was discharged using a spinning die having two holes (L / D=0.35 mm / 0.31 mm) at a discharge amount such that the fineness after stretching was 10 dtex. The discharged polyphenylene sulfide yarn was cooled by a direct-flow cooling device and an emulsion oil was supplied under the conditions described in Table 1. In the same manner as in Example 1, the yarn was stretched through a pretension roller, godet rollers 1, 2, and 3, and wound on a winder to obtain a 10 dtex polyphenylene sulfide monofilament using a conical reel.

[0113] [Example 4]

[0114] A polyphenylene sulfide resin having an MFR of 160 g / 10 min was prepared and melted at a spinning temperature of 328° C. The molten polyphenylene sulfide was discharged using a spinning die having two holes (L / D=0.4 mm / 0.37 mm) at a discharge rate such that the fineness after stretching was 14 dtex. The discharged polyphenylene sulfide yarn was cooled by a direct-flow cooling device and an emulsion oil was supplied under the conditions described in Table 1. In the same manner as in Example 1, the yarn was stretched through a pretension roller, godet rollers 1, 2, and 3, and wound on a winder to obtain a 14 dtex polyphenylene sulfide monofilament using a conical reel.

[0115] [Example 5]

[0116] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 1 except that the heat setting temperature of the godet roller 3 was set to 190°C.

[0117] [Comparative Examples 7 and 8]

[0118] The polyphenylene sulfide monofilament was produced in the same manner as in Example 1 except that the temperature of the godet roller 1 was changed as shown in Table 1.

[0119] [Comparative Example 9]

[0120] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 1 except that the speeds of the pretension roller and the godet roller 1 of Example 1 were reduced to set the elongation to 22% and the temperature of the godet roller 2 was set to 150°C.

[0121] [Comparative Example 10]

[0122] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 1 except that the speeds of the pretension roller and the godet roller 1 of Example 1 were increased to set the elongation to 50% and the temperature of the godet roller 2 was set to 150°C.

[0123] [Comparative Example 11]

[0124] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2 except that the temperature of the godet roller 2 was changed to 190° C. and the winding tension was changed to 0.6 cN / dtex.

[0125] [Comparative Example 12]

[0126] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2 except that the temperature of the godet roller 2 was changed to 110° C. and the package of the reel was changed to a drum type.

[0127] [Example 6]

[0128] A fiber package was obtained in the same manner as in Example 1 except that the taper angle was changed to 120°, the winding speed was adjusted, the winding tension was changed to 0.4 cN / dtex, and the oil adhesion rate was changed to 0.4 mass %.

[0129] [Example 7]

[0130] A fiber package was obtained in the same manner as in Example 1 except that the winding speed was adjusted, the winding tension was set to 0.5 cN / dtex, and the winding angle was set to 1.2°.

[0131] [Example 8]

[0132] A fiber package was obtained in the same manner as in Example 1 except that the taper angle was changed to 180°, the roll shape was changed to a drum shape, and the winding angle was changed to 5°.

[0133] [Example 9]

[0134] A fiber package was obtained in the same manner as in Example 1 except that the taper angle was changed to 180° and the roll shape was changed to a drum shape.

[0135] [Examples 10 and 11]

[0136] A fiber package was obtained in the same manner as in Example 1 except that the taper angle was changed to 160° and 20°.

[0137] [Examples 12 and 13]

[0138] A fiber package was obtained in the same manner as in Example 1 except that the winding angle was changed to 0.5° and 2.5°.

[0139] [Examples 14 and 15]

[0140] A fiber package was obtained in the same manner as in Example 1 except that the roll width was changed to 70 mm and 300 mm.

[0141] [Comparative Examples 13 and 14]

[0142] In Comparative Example 13, a polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2 except that the speed and winding tension of the winder were changed. In Comparative Example 14, the same manner as in Example 2 was carried out except that the speed and winding tension of the winder were changed.

[0143] [Comparative Examples 15 and 16]

[0144] A fiber package was obtained in the same manner as in Example 1 except that the oil adhesion rate on the yarn was changed to 0.1% by mass and 0.6% by mass.

[0145] The production conditions, yarn properties, and evaluation results (spinning operability, weaving properties and appearance evaluation, mesh performance evaluation, and comprehensive evaluation) of the polyphenylene sulfide monofilaments of Examples 1 to 5 and Comparative Examples 1 to 12 are shown in Table 1. The strength and elongation of the yarn properties in the table are breaking strength and breaking elongation. PTR represents a pre-tensioning roller, GR1 represents a godet roller 3, GR2 represents a godet roller 2, GR3 represents a godet roller 3, and W / D represents a winder.

[0146]

Table 1

[0147]

[0148] The polyphenylene sulfide monofilaments obtained from Examples 1 to 5 are high-strength, low-thickness, and high-quality monofilaments. In addition, the mesh fabrics using the monofilaments obtained from Examples 1 to 5 have no skipping of yarns, no breakage of warp and weft yarns, and no streaks, thick yarns, or abnormal gloss due to shrinkage or other factors, and have good quality. They have sufficient strength, good dimensional stability, and high durability even when used as filters, and have good quality. Among them, the mesh fabrics obtained from the monofilaments of Examples 1 and 5 have no shrinkage, streaks, etc., and have particularly excellent performance.

[0149] The mesh fabric obtained from the polyphenylene sulfide monofilament obtained in Comparative Example 1 with a low heat setting temperature has low dimensional stability, mesh misalignment, low strength durability, and poor quality. This is probably because the polyphenylene sulfide monofilament obtained in Comparative Example 1 has low strength and high hot water shrinkage.

[0150] The polyphenylene sulfide monofilament obtained in Comparative Example 2 with a high heat setting temperature was subjected to melting, breaking, and shaking on the godet roller 2, and the monofilament could not be taken up onto a reel.

[0151] The polyphenylene sulfide monofilament obtained in Comparative Example 3 in which the winding tension on the winder was reduced was loose between the godet roller 2 and the winder, and the yarn was frequently broken when winding on the godet roller 2 or on the reel, so that the monofilament could not be normally collected on the reel.

[0152] The polyphenylene sulfide monofilament obtained by Comparative Example 4 in which the winding tension of the winding machine was increased was not suitable for mass production because the winding tension was high and the yarn was tight when the winding amount exceeded 1 kg. The roll could not be removed from the winder. In addition, regarding the weavability of the mesh fabric obtained from the thin yarn roll, the 5% modulus and 10% modulus were high, so the inner layer of the roll shrank and the mesh fabric had stripes, which was inferior in quality. In addition, during the heat setting during weaving, the mesh fabric stretched and the mesh was misaligned, which was inferior in quality.

[0153] The polyphenylene sulfide monofilament obtained in Comparative Example 5 using a polyphenylene sulfide resin with a high MFR has very low viscosity, and even if the elongation at break is close to 30%, the breaking strength is only 3.2 cN / dtex. As a result, the strength and durability of the mesh fabric are reduced, resulting in poor quality.

[0154] The polyphenylene sulfide monofilament obtained in Comparative Example 6 using a polyphenylene sulfide resin having a low MFR had very high viscosity, and unmelted materials and gels were easily generated. The yarn on the godet roller frequently shook, and the monofilament could hardly be collected. There were also thick places on the monofilament, so the warp yarn often broke during weaving. In the obtained mesh fabric, stripes and thick places caused by shrinkage existed together, and the quality was poor, and the product was of very poor quality.

[0155] The polyphenylene sulfide monofilament obtained in Comparative Example 7 in which the preheating temperature of the godet roller 1 was lowered was about 10°C lower than the glass transition temperature of polyphenylene sulfide. Therefore, the unstretched portion was mixed in the stretching between the godet rollers 1 and 2, and the yarn shaking at the yarn eye after the godet roller 2 was very serious and almost impossible to be wound onto the winder, so the monofilament could not be wound onto the reel.

[0156] The polyphenylene sulfide monofilament obtained in Comparative Example 8 in which the preheating temperature of the godet roller 1 was increased was about 40°C higher than the glass transition temperature of polyphenylene sulfide. Therefore, the yarn on the godet roller 1 was loose, resulting in significant yarn shaking and frequent yarn breakage, so that no monofilament could be obtained.

[0157] The polyphenylene sulfide monofilament obtained from Comparative Example 9, in which the monofilament elongation is as low as 22%, is prone to breakage during spinning due to its low elongation. In addition, even if relaxation is performed, shrinkage occurs when the roll is unwound due to the increase in 5% modulus and 10% modulus. In the mesh fabric using this monofilament, there are stripes caused by shrinkage, and the quality is poor. In terms of performance, the main factors that occur during weaving are continued, so the performance is also low and the appearance is also poor.

[0158] The polyphenylene sulfide monofilament obtained in Comparative Example 10, in which the monofilament elongation was as high as 50%, had good spinning operability, but the strength, 5% modulus and 10% modulus were quite low, so the dimensional stability of the obtained mesh fabric was very poor. The mesh fabric also had mesh displacement due to elongation, etc., and the strength durability was very poor.

[0159] The polyphenylene sulfide monofilament obtained in Comparative Example 11, in which the heat setting temperature was set to 190°C and the winding tension was set to 0.6 cN / dtex, was not suitable for mass production because the winding tension was high and the yarn was tight when the winding amount exceeded 1 kg, and it was impossible to remove it from the winder. In addition, in the evaluation of the weavability of the mesh fabric of the thin yarn roll, the inner layer of the roll was shrunk during unwinding, and the blank had stripes and poor quality. This is considered to be due to the high 10% modulus.

[0160] The polyphenylene sulfide monofilament obtained from Comparative Example 12, in which the heat setting temperature was as low as 110°C and the roll package was drum-shaped, had a low heat setting temperature, low breaking strength, and high hot water shrinkage. In addition, since the roll was formed into a drum-shaped shape during weaving, the yarn fell off the end surface of the roll (thread drop). Therefore, due to poor roll unwinding during weaving, thread breakage occurred, and the dimensional stability of the mesh fabric decreased, the durability of the strength decreased, and the quality was poor.

[0161] As described above, the polyphenylene sulfide monofilaments obtained in Examples 1 to 5 have excellent spinning operability, and almost no streaks, reed grinding, yarn skipping, thick yarn segments, or thread breakage caused by shrinkage occur during weaving, and are high-quality products with both strength. The obtained mesh fabrics before and after processing have almost no appearance abnormalities such as mesh misalignment and streaks caused by shrinkage, and have excellent dimensional stability and strength, so they are high-quality products that can be used in high-performance filter applications.

[0162] Table 2 shows the production conditions, yarn properties, and evaluation results of the polyphenylene sulfide monofilaments of Examples 1, 3, 4, 6 to 16 and Comparative Examples 13 to 15.

[0163]

Table 2

[0164]

[0165] By controlling the physical properties such as breaking strength, breaking elongation, 5%, 10% modulus, winding conditions such as winding, winding width, taper angle, winding angle, etc., the monofilaments of the fiber packages of polyphenylene sulfide monofilaments obtained in Examples 1, 3, 4, and 6 can be manufactured by direct spinning and stretching, and are high-strength and high-quality monofilaments with few thick sections. In addition, regarding these fiber packages, the yarn roll shape of the package is good, there is no shape defect such as tight yarn roll, yarn roll collapse, etc., the relaxation is also good, and the heat shrinkage stress ratio of the inner and outer layers is also good, and the products are uniform and good quality. In addition, the mesh fabric obtained from the polyphenylene sulfide monofilament wound on the weft yarn tube-type package with a taper portion has no yarn skipping, no warp and weft yarn breakage, and no stripes, thick yarns, gloss abnormalities, etc. caused by shrinkage or other factors in appearance, and the quality is good. Furthermore, the strength is sufficient, the dimensional stability is excellent, and the product is high in durability and good in quality as a filter.

[0166] Among them, Examples 1 and 6 were able to obtain polyphenylene sulfide mesh fabrics having good fiber properties, no shrinkage, no streaks, etc., and having particularly excellent performance.

[0167] The fiber package of polyphenylene sulfide monofilament obtained in Example 8, in which the fiber package was drum-shaped and had a large winding angle, was drum-shaped and had a winding angle of 5°. However, the moving speed of the traverse rod was fast, and the yarns flowed outward due to their kinetic energy, which easily caused yarn drop, resulting in a package with poor yarn unwinding properties. During weaving, the unwinding properties of the package were poor, so streaks or broken yarns occurred, resulting in poor quality.

[0168] The fiber package of polyphenylene sulfide monofilament obtained in Example 9 in which the fiber package was drum-shaped was lighter than that in Comparative Example 13, but it was easy to drop the yarn due to the drum-shaped fiber package, and the yarn unwinding property was poor. Regarding the weaving property, the unwinding property from the roll was slightly poor, so streaks and broken yarns occurred, and the quality was poor.

[0169] The fiber package of polyphenylene sulfide monofilament obtained from Example 10, in which the fiber package is close to a drum-shaped weft tube, is lighter than Example 9, but is prone to yarn drop and has a slightly poor yarn unwinding property, considering that it is close to a drum-shaped package. As for weaving properties, the unwinding property from the drum is slightly poor, so streaks and yarn breakage occur, resulting in poor quality.

[0170] The fiber package of polyphenylene sulfide monofilament obtained in Example 11 with a very small taper angle has a good yarn shape, but due to the small taper angle, it is not possible to wind a sufficient amount, which increases the cost and deteriorates the production efficiency. Due to the small amount of winding, the yarn knot is mixed in when changing the winding drum during weaving, which reduces the working efficiency.

[0171] The fiber package of polyphenylene sulfide monofilament obtained in Example 12 with a very small winding angle had stripes due to doubling in the center of the surface of the winding drum, and the stripes continued to appear during winding. As a result, the appearance was poor and the unwinding property was slightly poor. Therefore, stripes or thread breakage occurred during weaving, and the quality was poor.

[0172] The fiber package of polyphenylene sulfide monofilament obtained in Example 13 with a large winding angle had slight yarn loss at the taper portion, resulting in a package with poor yarn unwinding properties. Therefore, slight streaks and yarn breaks occurred during weaving, resulting in poor quality.

[0173] The fiber package of polyphenylene sulfide monofilament obtained by Example 14, in which the winding width of the package is small, has a good yarn winding shape, but due to the small winding width, it is not possible to wind a sufficient winding amount, the cost is increased, and the production efficiency is deteriorated. Due to the small winding amount, the yarn knot is mixed in when changing the winding drum during weaving, and the working efficiency is reduced. The mesh performance is good.

[0174] The fiber package of polyphenylene sulfide monofilament obtained in Example 15 having a large package width had a good yarn shape, but the innermost layer was easily shrunk when unwinding, and the mesh fabric after weaving had stripes and poor quality.

[0175] The fiber package of polyphenylene sulfide monofilament obtained in Comparative Example 13, in which the winding tension to the winder was high, had a high 10% modulus due to the high winding tension. When a yarn package of 1 kg or more was formed, the yarn package was tight on the winder and could not be taken up. In addition, the heat shrinkage stress ratio of the innermost layer was greatly reduced, and the monofilament was of poor quality.

[0176] In the fiber package of polyphenylene sulfide monofilament obtained in Comparative Example 14 where the winding tension to the winder was low, the yarn was loosened between the godet roller 3 and the winder due to the low winding tension, making it difficult to wind the yarn to the winder, and the fiber package could not be taken up.

[0177] The fiber package of polyphenylene sulfide monofilament obtained in Comparative Example 15 in which the grease adhesion rate to the yarn was low, caused yarn breakage due to yarn shaking on the godet roller, and a sufficient amount could not be collected due to the low grease adhesion rate.

[0178] In the fiber package of polyphenylene sulfide monofilament obtained in Example 16, in which the grease adhesion rate to the yarn was high, the yarn wound on the reel easily slipped, so that the yarn dropped from the taper portion, resulting in poor appearance. In addition, the unwinding property of the reel was poor, and streaks, broken threads, and skipped yarns occurred during weaving, resulting in poor quality.

[0179] As described above, the fiber packages of polyphenylene sulfide monofilaments obtained from Examples 1, 3, 4, 6, and 7 have no yarn tightness, insufficient winding, yarn doubling, or yarn drop, and the quality difference between the inner and outer layers is small. There is no broken thread during unwinding during weaving, and there are almost no stripes, reed grinding, yarn skipping, or broken threads caused by shrinkage or unwinding during weaving. They are high-quality products with both strength. The obtained mesh fabrics before and after processing have almost no appearance abnormalities such as stripes caused by mesh misalignment or shrinkage, and have excellent dimensional stability and strength. Therefore, they are high-quality products that can be used in particularly high-performance filter applications. The spinning operability of the polyphenylene sulfide monofilaments obtained from Examples 8 to 16 is "0", and the mesh performance is "△" or "0", but it cannot be said to be satisfactory in terms of the weaving properties and appearance of the package evaluation.

Claims

1. A tubular weft fiber package formed of polyphenylene sulfide monofilaments, characterized in that: The main structural unit of the polyphenylene sulfide monofilament is a phenylene sulfide unit, and the polyphenylene sulfide monofilament satisfies the following (1) to (5), (1) Denier is 6 to 35 dtex; (2) Breaking strength of 3.4 cN / dtex or more; (3) Elongation at break is 24-45%; (4) 5% modulus is 1.0 to 1.6 cN / dtex; (5) 10% modulus is 1.4 to 2.3 cN / dtex.

2. The tubular weft fiber package according to claim 1, characterized in that: The roll width is 100-250 mm, the cone angle is 30-140 degrees, the winding angle is 0.6-2 degrees, and the thermal shrinkage stress ratio of the innermost and outermost layers is 0.85-1.

15.

3. A method for manufacturing a fiber package, for manufacturing the fiber package according to claim 1 or 2, wherein: A fiber package consisting of polyphenylene sulfide monofilaments whose main structural units are phenylene sulfide units is manufactured by a direct spinning and stretching method, wherein after the polyphenylene sulfide resin is melt-extruded and cooled to solidify, the obtained unstretched yarn is not temporarily wound but is continuously stretched and wound on a reel by a winder, The manufacturing method satisfies the following (1) to (4), (1) The MFR of polyphenylene sulfide resin is 100 to 250 g / 10 min; (2) when stretching the unstretched yarn, use an unheated pre-tensioning roller and two or more heated godet rollers for stretching; (3) The temperature of the first godet roller is 95 to 120° C., and the heat setting temperature of the heating godet rollers after the second godet roller is 120 to 250° C.; (4) The winding tension of the winder is 0.1 to 0.5 cN / dtex.

4. A method for producing a fiber package, for producing the fiber package formed of polyphenylene sulfide monofilaments according to claim 1, wherein: Grease is attached to the obtained undrawn yarn so that the grease adhesion rate of the polyphenylene sulfide monofilament becomes 0.15 to 0.5 mass %, and then the undrawn yarn is drawn and wound around a reel.

5. A method for producing a fiber package formed of polyphenylene sulfide monofilaments, characterized in that: A fiber package comprising polyphenylene sulfide monofilaments according to claim 1 is manufactured by a direct spinning and stretching method, wherein after the polyphenylene sulfide resin is melt-extruded and cooled to solidify, the unstretched yarn obtained is not temporarily wound but is continuously stretched and wound on a weft-shaped drum by a winder, Before winding the undrawn yarn on the reel, grease is supplied so that the grease adhesion rate of the polyphenylene sulfide monofilament is 0.15-0.5% by mass, and the undrawn yarn is wound on the reel in a weft tube shape with a winding width of 100-250 mm, a taper angle of 30-140°, and a winding angle of 0.6-2°.

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