TW202307298A - Polyphenylene sulfide monofilament, method for producing same, and fiber package - Google Patents

Abstract

The invention provides a polyphenylene sulfide monofilament which is characterized in that a main structural unit is a phenylene sulfide unit and meets the following requirements (1)-(5): (1) the fineness is 6-35 dtex; (2) the breaking strength is 3.4 cN/dtex or more; (3) the elongation at break is 24-45%; (4) a 5% modulus of 1.0 to 1.6 cN/dtex; and (5) a 10% modulus of 1.4 to 2.3 cN/dtex.

Description

Polyphenylene sulfide monofilament fiber, manufacturing method thereof, and fiber packaging

The invention relates to a polyphenylene sulfide monofilament fiber, its manufacturing method, and its fiber packaging. This application claim is 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 filed on April 7, 2021 The priority of No. 2021-065544 refers to all the contents described in the above-mentioned Japanese patent application.

As industrial filters, mesh fabrics made of polyphenylene sulfide, polyvinylidene fluoride, liquid crystal polyester, etc. are currently widely used in terms of chemical resistance, dimensional stability, and thermal durability. In particular, mesh fabrics made of polyphenylene sulfide are widely used because they are excellent in chemical resistance, dimensional stability, and cost efficiency, and are suitable for fields requiring high filter performance. Furthermore, in recent years, the productivity of thin monofilament fibers has been very low, and therefore, it is also expected to reduce costs by shortening the steps by using the direct spinning drawing method. Patent Document 1 describes a polyphenylene sulfide monofilament fiber characterized in that the fineness is 25 dtex or less, the strength is 3.0 cN/dtex or more, and the elongation is less than 30%. Fiber method. Also, Patent Documents 2 and 3 describe a drum-shaped package made of polyphenylene sulfide monofilament fibers obtained by direct spinning and stretching without temporary coiling. The unstretched yarn is stretched continuously and wound up by a winder. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent No. 4844515 [Patent Document 2] International Publication No. W02016/104236 [Patent Document 3] Japanese Patent Laid-Open No. 2017-101365

[Problem to be Solved by the Invention]

However, when the elongation of the polyphenylene sulfide monofilament fibers described in Patent Documents 1 to 3 is less than 30%, yarn breakage during spinning or warp yarn breakage during weaving may easily occur. first class. This is the main reason for the poor yield and performance decline of the mesh fabric. Furthermore, as described in Patent Document 1, if a monofilament fiber with an elongation rate close to 20% is wound by a thin weft tube, the 5% modulus and/or the 10% modulus become high, so when unwinding the weft tube In the innermost part, there is a possibility that the weft tube will be dented and the quality will be damaged. Also, in the case of drum packages as described in Patent Documents 2 and 3, unwinding failure of the yarn caused by yarn falling off from the end surface of the bobbin (twill falling off) occurs, and winding collapse occurs. Furthermore, bobbins with twill shedding may cause problems during weaving.

Therefore, the object of the present invention is to obtain a polyphenylene sulfide monofilament fiber with high quality fineness, which is not easy to break, is not easy to cause the collapse of the winding of the bobbin or the dent when unwinding, and is easy to handle during weaving. Another object of the present invention is to obtain a fiber package of high-quality polyphenylene sulfide monofilament fibers capable of suppressing broken ends, dross, and streaks during weaving. Another object of the present invention is to obtain the above-mentioned polyphenylene sulfide monofilament fiber with high production efficiency by direct spinning and stretching. [Technical means to solve the problem]

The present inventors obtained specific fineness, breaking strength, elongation at break, 5% modulus, 10% modulus monofilament fiber. Moreover, it was found that compared with the existing monofilament fiber, the spinning operation of the monofilament fiber is better, the winding collapse of the bobbin can be prevented, the occurrence of dents during unwinding can be improved, and the weaving is also easy to handle and high in quality. Polyphenylene sulfide monofilament fiber.

That is, the first aspect of the present invention relates to a polyphenylene sulfide monofilament fiber, which is characterized in that the main constituent unit is a phenylene sulfide unit, and satisfies (1) to (5): (1) The fineness is 6-35 dtex; (2) The breaking strength is above 3.4 cN/dtex; (3) The elongation at break is 24-45%; (4) 5% modulus is 1.0~1.6 cN/dtex; (5) The 10% modulus is 1.4 to 2.3 cN/dtex.

The second aspect of the present invention relates to a weft-shaped fiber package, which is composed of the above-mentioned polyphenylene sulfide monofilament fiber.

The third aspect of the present invention relates to the fiber packaging of the above-mentioned polyphenylene sulfide monofilament fiber. The winding width is 100-250 mm, the taper angle is 30-140°, the twill angle is 0.6-2°, and the innermost layer of the packaging The ratio to the thermal shrinkage stress value of the outermost layer (the thermal shrinkage stress ratio of the innermost layer) is 0.85 to 1.15.

The fourth aspect of the present invention relates to a method for producing the above-mentioned polyphenylene sulfide monofilament fiber, which is to melt-extrude a polyphenylene sulfide resin whose main constituent unit is a phenylene sulfide unit, and after cooling and solidifying, do not temporarily A method of producing polyphenylene sulfide monofilament fibers by a direct spinning drawing method of taking the obtained unstretched yarn, stretching it continuously and winding it with a coiler, characterized in that it satisfies (1) to (4) : (1) The MFR of polyphenylene sulfide resin is 100-250 g/10min; (2) When stretching the unstretched yarn, use an unheated pretension roller and more than two heated guide rollers to stretch; (3) The temperature of the first guide roller is 95-120°C, and the heat setting temperature of the heating guide roller after the second guide roller is 120-250°C; (4) The coiling tension of the coiler is 0.1~0.5 cN/dtex.

The fifth aspect of the present invention relates to a method for manufacturing the above-mentioned fiber packaging, which is obtained by melt-extruding polyphenylene sulfide resin whose main constituent unit is a phenylene sulfide unit, cooling and solidifying, and then not coiling temporarily A method of manufacturing a fiber package made of polyphenylene sulfide monofilament fibers by a direct spinning stretching method in which the yarn is continuously stretched without stretching and wound up to a bobbin by a coiler, characterized in that it satisfies (1) ~(4): (1) The MFR of polyphenylene sulfide resin is 100-250 g/10min; (2) When stretching the unstretched yarn, use an unheated pretension roller and more than two heated guide rollers to stretch; (3) The temperature of the first guide roller is 95-120°C, and the heat setting temperature of the heating guide roller after the second guide roller is 120-250°C; (4) The coiling tension of the coiler is 0.1~0.5 cN/dtex.

The sixth aspect of the present invention relates to a method of manufacturing fiber packaging composed of polyphenylene sulfide monofilament fibers, which is cooled and solidified by melt-extruding a polyphenylene sulfide resin whose main constituent unit is a phenylene sulfide unit Afterwards, the obtained unstretched yarn is not temporarily wound up but continuously stretched and wound up to the weft-shaped bobbin with a winding tension of 0.1 to 0.5 cN/dtex on the winding machine. Fiber packaging made of polyphenylene sulfide monofilament fibers.

The seventh aspect of the present invention relates to the above-mentioned method for producing a fiber package, which involves stretching the undrawn yarn obtained after attaching oil and fat to the obtained undrawn yarn so that the oil and fat adhesion rate of the polyphenylene sulfide monofilament fiber becomes 0.15 to 0.5% by mass. And coiled to the bobbin.

The eighth aspect of the present invention relates to a method of manufacturing a fiber package composed of polyphenylene sulfide monofilament fibers, which is performed by melting and extruding a polyphenylene sulfide resin whose main constituent unit is a phenylene sulfide unit, and cooling After solidification, the unstretched yarn obtained is not temporarily wound up but continuously stretched and wound up to a weft-shaped bobbin by a coiler to produce a polyphenylene sulfide monofilament fiber. A fiber packaging method, characterized in that before winding the undrawn yarn into a bobbin, grease is applied so that the grease adhesion rate of the polyphenylene sulfide monofilament fiber becomes 0.15 to 0.5% by mass, so that the winding width 100-250 mm, taper angle 30-140°, twill angle 0.6-2°, and is wound on the bobbin into a weft tube shape.

The ninth aspect of the present invention relates to a polyphenylene sulfide monofilament fiber weft tubular fiber package, the winding width of which is 100-250 mm, the cone angle is 30-140°, the twill angle is 0.6-2°, and the innermost layer The thermal shrinkage stress ratio is 0.85~1.15. [Effect of Invention]

According to the polyphenylene sulfide monofilament fiber of the present invention, it is difficult to break the yarn during spinning, the spinning workability is good, and a high-quality mesh fabric with excellent mesh strength and durability can be obtained. In addition, in particular, polyphenylene sulfide monofilament fibers suitable for packaging in the shape of weft tubes can be obtained. Furthermore, according to the fiber package of the present invention, it is possible to obtain a fiber package of high-quality polyphenylene sulfide monofilament fibers in a good winding state and capable of suppressing breakage, dross, and streaks during weaving. In addition, the present invention can obtain the above-mentioned polyphenylene sulfide monofilament fiber with high production efficiency by the direct spinning and drawing method.

Hereinafter, the present invention will be described in detail.

The polyphenylene sulfide resin in the present invention is a polyphenylene sulfide composed of a polymer having a phenylene sulfide unit as a main repeating unit (main constituent unit). The phenylene sulfide unit may, for example, be a p-phenylene sulfide unit or a m-phenylene sulfide unit. Polyphenylene sulfide may be a homopolymer composed of p-phenylene sulfide units or m-phenylene sulfide units, etc., or a copolymer having these, but from the viewpoints of heat resistance, processability, and economy, It is preferably a repeating unit of p-phenylene sulfide. In the polyphenylene sulfide resin, the repeating unit of p-phenylene sulfide is preferably at least 50 mol%, more preferably at least 70 mol%, especially preferably at least 90 mol%, and more preferably at least 98 mol% above.

Among the polymer types of polyphenylene sulfide, cross-linked type, semi-cross-linked type, and linear type (linear type) are exemplified, but linear type is preferable from the viewpoint of spinning and elongation.

Furthermore, polyphenylene sulfide may also contain a small amount of various metal oxides; inorganic substances such as kaolin and silicon dioxide; or colorants, matting agents, flame retardants, antioxidants, ultraviolet rays, etc., within the range that does not impair the effects of the present invention. Various additives such as absorbents, infrared absorbents, crystal nucleating agents, fluorescent whitening agents, end-group capping agents, and compatibilizers.

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

The moisture content of the pellets of the polyphenylene sulfide resin before spinning in the present invention is preferably 100 ppm or less, more preferably 10 to 50 ppm. When the content exceeds 100 ppm, there is a possibility that yarn breakage or air bubbles (air bubbles) may be mixed in during spinning, and spinning workability may be lowered.

The particles of polyphenylene sulfide resin in the present invention are preferably vacuum-dried as pre-drying to remove low molecular weight components as much as possible. In the case of pre-drying, the drying temperature is preferably 130-190° C., and the drying time is preferably 6-12 hours.

The cross-sectional shape of the polyphenylene sulfide monofilament fiber of the present invention is not particularly limited. The shape of the polyphenylene sulfide monofilament fiber of the present invention is preferably circular.

The fineness of the polyphenylene sulfide monofilament fiber of the present invention is preferably 6-35 dtex. If it exceeds 35 dtex, it will be difficult to solidify by cold air, and it will be difficult to obtain high-quality monofilament fibers, which will cause problems when making products such as filters.

The breaking strength of the polyphenylene sulfide monofilament fiber of the present invention is 3.4 cN/dtex or more, more preferably 3.8 cN/dtex or more, from the viewpoint of the durability of the mesh of a filter or the like. As a suitable upper limit, 5 cN/dtex or less is mentioned.

The elongation at break of the polyphenylene sulfide monofilament fiber of the present invention is 24-45%, preferably 24-40%. More preferably, it is 30-40%, More preferably, it is 30-35%. When the elongation at break is less than 24%, end breaks often occur during spinning, reed marks occur during weaving, and weavability decreases. When the elongation at break exceeds 45%, the amorphous portion of the silk fiber increases, resulting in poor dimensional stability of the mesh and reduced durability.

The 5% modulus of the polyphenylene sulfide monofilament fiber of the present invention is 1.0-1.6 cN/dtex, preferably 1.2-1.6 cN/dtex. Regarding the 5% modulus, from the viewpoint of mesh durability, it is better to be higher, but if it exceeds 1.6 cN/dtex, it will cause dents when unwinding the inner layer of the bobbin, and it is impossible to obtain a good quality mesh. If it is less than 1.0 cN/dtex, the dimensional stability and strength durability of the mesh will deteriorate, and misalignment will easily occur.

The 10% modulus of the polyphenylene sulfide monofilament fiber of the present invention is 1.4-2.3 cN/dtex, preferably 1.7-2.1 cN/dtex. Regarding the 10% modulus, from the viewpoint of mesh durability, it is better to be higher, but if it exceeds 2.3 cN/dtex, it will cause dents when unwinding the inner layer of the bobbin, and it will not be possible to obtain a good quality mesh. If it is less than 1.4 cN/dtex, the dimensional stability and strength durability of the mesh will deteriorate, and misalignment will easily occur.

With regard to the polyphenylene sulfide monofilament fiber as described above, dents at the time of unwinding are eliminated, and therefore, handling at the time of weaving is easy.

The hot water shrinkage of the polyphenylene sulfide monofilament fiber of the present invention is preferably 10% or less. More preferably, it is 2 to 8%. The shrinkage rate in hot water is preferably set low from the viewpoint of the dimensional stability of the mesh. When it exceeds 10%, there is a tendency for the dimensional stability of the mesh to deteriorate, so there is a possibility of becoming a poor-quality filter.

In the weft tubular fiber package of polyphenylene sulfide monofilament fiber in the present invention, the ratio of the thermal shrinkage stress value of the silk fiber in the innermost layer of the fiber package to the thermal shrinkage stress of the silk fiber in the outermost layer of the package (referred to as the thermal shrinkage stress ratio of the innermost layer) is preferably 0.85 to 1.15. More preferably, it is 0.9-1.1. When the thermal shrinkage stress ratio of the innermost layer is outside the range, it will become one of the reasons for the collapse of the winding or the shrinkage of the winding, and the difference in stress will cause deformation of the mesh fabric, which may become a poor quality mesh fabric .

In view of the passability of the polyphenylene sulfide monofilament fiber of the present invention in subsequent steps and obtaining a high-quality mesh fabric, etc., the oil and fat adhesion rate is preferably 0.15 to 0.5% by mass. More preferably, it is 0.15-0.45 mass % or 0.2-0.5 mass %, More preferably, it is 0.25-0.35 mass %. If it is less than 0.15% by mass, static electricity tends to be generated easily, and workability such as weaving tends to be deteriorated. When it exceeds 0.5% by mass, dross tends to be generated during weaving, which may affect the quality of mesh fabrics and industrial filters, or cause bobbin collapse in the spinning and winding step.

As a suitable oil agent for the polyphenylene sulfide monofilament fiber in the present invention, it contains 30% by mass or more of a fatty acid ester-based smoothing agent in terms of smoothness and reed mark prevention. Appropriately add antistatic agent or emulsifier. Furthermore, it is preferable to further improve the smoothness by adding 1 to 3% by mass of modified silicone to the oil stock solution. When the modified silicone is added in excess, the yarn may slide in the bobbin during winding, causing the winding to collapse, so the above-mentioned range is preferable. As a suitable method of applying an oil agent, a method of preparing an emulsion of 5 to 20% by mass with ion-exchanged water and applying it with an oiling nozzle directly above a pretension roller may be mentioned.

As a method for producing the polyphenylene sulfide monofilament fiber of the present invention, the monofilament fiber is obtained by stretching after spinning, and at this time, it can be produced by methods such as direct spinning stretching method and conventional method. Also, it may be a method of producing a multifilament by a direct spinning drawing method, and then dividing the mother yarn composed of the above-mentioned multifilament to produce a monofilament fiber. Considering manufacturing steps, cost, and dents during unwinding, it is preferable to manufacture by direct spinning and stretching.

The polyphenylene sulfide monofilament fiber of the present invention can be stretched and rolled by an unheated pretension roll and two or more heating guide rolls after the spinning step of melt-extruding polyester phenylene sulfide resin. Obtained by taking the extension step.

Hereinafter, aspects of a suitable production method will be described in detail. In the spinning step, polyphenylene sulfide resin melted by an extruder is measured, and oil is applied to the yarn extruded from the nozzle. Thereafter, a stretching step is carried out following the spinning step. In the stretching step, stretching is carried out using a plurality of guide rollers, the crystallization is sufficiently carried out, the fiber structure is fixed, and a stretched yarn is obtained. In the stretching step, a relaxation step may also be introduced to reduce the thermal shrinkage of the stretched yarn. In this case, the relaxation rate in the relaxation step is preferably 0 to 2% from the viewpoint of easily preventing the generation of dents. A more preferable range of relaxation rate is 0-1%. When the relaxation rate is less than 0%, the tension between the rollers in the stretching step becomes high, so the alignment of the amorphous portion becomes high, and dents or winding constriction of the bobbin tend to frequently occur. When the relaxation rate exceeds 2%, the alignment of the amorphous part decreases. Therefore, it is difficult to obtain a high-quality monolayer with a modulus of 5% and a modulus of 10% satisfying the above range, and the breaking strength and elongation at break are within the range of the present invention. The danger of silk fibers. In addition, the yarn may be slack and may not be wound up.

Furthermore, in the stretching step, in order to eliminate bending, it is preferable to carry out pre-stretching at a stretching ratio of 1.01 to 1.05 between the pre-tension roll and the guide roll 1, and then perform main stretching after the guide roll 1. In the actual stretching, it is preferable to set the temperature of the guide roll 1 at 95 to 120° C. and perform stretching. More preferably, it is 100-115°C. Thereafter, it is guided to the guide roller 2, heat-set and stretched by the guide roller 2. The heat setting temperature of the guide roller 2 is preferably 120-250°C, more preferably 130-200°C. Thereafter, it may further be guided to new guide rollers 3 and 4 and extended. In addition, the relaxation process may be performed by providing a relaxation step as described above. Furthermore, in the case of further heat-setting by the guide roll after the guide roll 3, it is preferably 120-250°C, more preferably 130-200°C. The guide rollers following the guide roller 3 may also be unheated rollers that do not undergo heat setting. After passing through the rollers, the yarn is taken up by a winder. The coiling tension when coiling to the coiler is preferably 0.1-0.5 cN/dtex. More preferably, it is 0.2 to 0.3 cN/dtex.

Furthermore, when the temperature of the guide roller 1 does not reach 95° C., the following situations often occur: knot-shaped bulges are produced on the yarn, or yarn breakage is caused due to the swing of the yarn on the guide roller. Also, when the temperature exceeds 120°C, the yarn often vibrates on the guide rollers, and yarn breakage occurs, making it difficult to collect monofilament fibers normally. When the temperature of the guide roll for heat setting after the guide roll 2 is lower than 120°C, it is difficult to obtain the monofilament fiber of the present invention. In addition, when the temperature exceeds 250°C, it will be slightly thermally fused, making it difficult to take up monofilament fibers. If the winding tension of the coiler is less than 0.1 cN/dtex, the winding of the bobbin will often collapse or break due to the low tension between the guide roller and the coiler, making it difficult to obtain single silk fiber. When it exceeds 0.5 cN/dtex, the winding of the bobbin is constricted, making it difficult to remove the bobbin from the coiler.

As the shape of the bobbin of the polyphenylene sulfide monofilament fiber of the present invention, it is preferably a weft tube in which the polyphenylene sulfide monofilament fiber is wound into a tapered shape using a paper tube usually used in the direct spinning stretching method. type. Generally speaking, in the direct spinning stretching method, it is a drum type, but in the case of a drum type, the yarn will easily fall off from the end surface of the bobbin when winding the monofilament fiber (twill shedding), and in severe cases, the winding collapse will occur . In the case of twill shedding, there is a possibility that the yarn gets stuck on the end surface during unwinding, causing end breakage or poor weaving, resulting in a decrease in step passability or a decrease in product quality.

As a winding condition for the fiber package made of the polyphenylene sulfide monofilament fiber of the present invention, the winding width of the innermost layer of the fiber package is 100 to 250 mm. More preferably, it is 150-200 mm. When the winding width is less than 100mm, unless the taper angle is increased, the winding capacity cannot be increased. If the taper angle is increased too much, the yarn will fall off from the end of the bobbin (twill shedding). When winding, the yarn is stuck, causing broken ends or streaks, and it becomes poor weaving. Considering the number of ends of the coiler or the limited length of the coiler, the upper limit of the coiling width should be 250 mm in terms of the productivity and cost of fiber packaging.

The cone angle of the fiber package of the present invention is 30-140°. More preferably, it is 45-100°. When the cone angle is less than 30°, although the winding collapse will not occur, it exists before the standard winding amount is rolled up. The winding width at both ends increases with the winding thickness, and the two ends are close to and touching. , can not be rolled to the target amount, and the productivity may be poor. When the taper angle exceeds 140°, there is a tendency that the yarn falls off from the taper and the winding collapses. For reference only, under the condition of 180° (equivalent to drum winding), the winding collapses caused by the frequent occurrence of twill shedding.

The twill angle of the fiber package of the present invention is 0.6-2°, preferably 0.8-2°. More preferably, it is 0.9 to 1.2°. When the twill angle is less than 0.6°, the ribbon-like yarn is biased against the packaging surface, resulting in poor unwinding or poor appearance of the bobbin. When the twill angle exceeds 2°, when the yarn is moved to both ends by traverse, sometimes the yarn will be ejected along with the trend, causing the yarn to fall off from the cone, resulting in winding collapse. This phenomenon tends to occur frequently especially when the fineness of the silk fiber is more than 20 dtex. [Example]

Hereinafter, the present invention will be described in detail with reference to examples. Furthermore, the present invention is not limited to the Examples described below. The physical properties and evaluations of the silk fibers in Examples are as follows.

A. MFR According to JIS K-7210 (1999), the MFR value was measured at a temperature of 315.5°C and a load of 5,000 g. B. Fineness According to JIS-L-1013, use a cloth inspection machine with a frame circumference of 1.125 m to coil the sample at a speed of 120 times/min, weigh its mass, and obtain the fineness. This was measured 5 times, and the average value was calculated|required. C. Breaking strength, elongation at break, 5% modulus, 10% modulus According to JIS L 1013, using AGS-1KNG Autograph (registered trademark) tensile testing machine manufactured by Shimadzu Corporation, under the conditions of sample yarn length 20 cm and constant tensile speed 20 cm/min. The value obtained by dividing the highest value of the load in the load-elongation curve by the fineness is taken as the breaking strength (cN/dtex), the elongation at this time is taken as the breaking elongation (%), and the strength when the elongation is 5% The 5% modulus (cN/dtex) was used, and the strength when the elongation was 10% was used as the 10% modulus (cN/dtex).

D. Thermal shrinkage stress ratio of the outermost layer The thermal shrinkage stress was measured using a KE-II shrinkage stress measuring device manufactured by Kanebo Engineering. Apply an initial load of denier × 2/30 (cN) to a sample whose yarn ends are connected into a ring shape with a length of 5 cm, and heat it at a rate of 120°C/min from room temperature, and measure the thermal shrinkage force at this time . 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). Then, the value obtained by dividing the highest value of the above-mentioned thermal shrinkage force by twice the fiber fineness is regarded as the thermal shrinkage stress (cN/dtex), and the measurement is carried out 5 times and the average value is regarded as the thermal shrinkage stress. The thermal shrinkage stress ratio (Sr) of the innermost layer was obtained by the following formula 1. Sr＝Si/So Formula 1 (Sr: thermal shrinkage stress ratio of the outermost layer; Si: thermal shrinkage stress of the innermost layer of the package (measured at a point from the outer diameter of the paper tube to a winding thickness of 1 mm); So: thermal shrinkage of the outermost layer of the package Stress (measured at the point after unwinding the surface layer of the package for 1 minute) E. Spinning Operability Regarding the spinning operability, if the passability of the steps is good, it is marked as "○", if the passability of the steps is slightly poor, it is marked as "△", and if the yarn cannot be produced, it is marked as "×".

F. Winding state of fiber packaging Regarding the winding operability, if the winding shape is good, it is marked as "○", if the winding volume is slightly collapsed and the amount of winding is insufficient, it is marked as "△", and if the winding collapses severely and the winding cannot be wound, etc., it is marked as "×". G. Weaving and Appearance Evaluation Using the obtained polyphenylene sulfide monofilament fibers, 420 mesh (root/2.54 cm) (6 to less than 11 dtex), 225 mesh (root/2.54 cm) (11 ～Under 21 dtex), 150 mesh (root/2.54 cm) (21～35 dtex) mesh fabric. At this time, weavability such as generation of scum on the reed, state of warp and weft breaks, and appearance of the obtained woven fabric (generation of knots, dents, streaks, etc.) were evaluated. Regarding the evaluation, if both the weaving property and the appearance were good, it was marked as "◯", if one of them was poor, it was marked as "△", and if both were bad, it was marked as "×". H. Performance evaluation of mesh Using the obtained polyphenylene sulfide mesh fabric, it was heat-set at 160°C for 20 minutes, and the appearance was evaluated after stretching and recovery cycles were performed on the processed mesh fabric (before and after heat-setting). The elongation recovery cycle is based on JIS L 1013, using the AGS-1KNG Autograph (registered trademark) tensile testing machine manufactured by Shimadzu Corporation, under the conditions of a sample length of 20 cm and a width of 5 cm, and a constant tensile speed of 20 cm/min , Implement 5 cycles of 10% elongation recovery. The appearance of the mesh fabric at this time was observed visually. Those without dislocation, deformation, or damage were marked as "〇", those with deformation and slight damage were marked as "×", and those without deformation or damage were marked as "△".

I. Comprehensive evaluation The comprehensive evaluation in which all four items of spinning workability, winding state, weaving and appearance evaluation, and mesh performance were judged as 0 was marked as "◎". The overall evaluation in which the spinning workability was 0 and the mesh performance was 0 or Δ was recorded as "0". In the cases other than the cases where the comprehensive evaluation is "◎" and "〇", the comprehensive evaluation of the spinning workability, weaving property, appearance evaluation, and mesh performance is "△" and the overall evaluation is expressed as "△" ". The comprehensive evaluation of any one of spinning operability and mesh performance as "X" was recorded as "X". J. Packaging evaluation The evaluations of winding state, weavability, and appearance were all 0 was marked as "0", any one was marked as "x", and the others were marked as "△".

[Example 1] A poly(p-phenylene sulfide) resin (moisture content: 20 ppm) with an MFR of 160 g/10min was prepared and melted at a spinning temperature of 328°C. Using a spinning nozzle (L/D=0.65 mm/0.65 mm) having two holes, the melted polyphenylene sulfide was discharged so that the stretched fineness became 33 dtex. The extruded polyphenylene sulfide yarn is cooled by a single-flow cooling device, and an emulsified oil (OPU=0.3% by mass) is applied, and then the yarn is wound up at a speed of 1,040 m/min. Heated pre-tension rollers, and then apply tension between guide roller 1 (speed 1,058 m/min, 115°C), then implement formal stretching and heat setting by guide roller 2 (speed 3,520 m/min, 135°C) , through the guide roller 3 (speed 3,500 m/min, unheated) to perform relaxation treatment to make it relax, and coil it to the coiler (speed 3,495 m/min) with a coiling tension of 0.2 cN/dtex, and the 33 dtex The polyphenylene sulfide monofilament fiber is wound into a weft-shaped bobbin with a winding width of 200 mm, a taper angle of 60°, and a twill angle of 1° so that the end surface becomes tapered.

[Example 2] The speed of the pre-tension roller is set to 920 m/min, the speed of the guide roll 1 is set to 960 m/min, the speed of the coiler is changed, and the guide roll 3 is not used, except that it is the same as that of Example 1 A polyphenylene sulfide monofilament fiber of 33 dtex was obtained in the same manner.

[Comparative example 1, 2] Except for changing the temperature of the guide roller 2 respectively, it carried out similarly to Example 2, and the comparative example 1 obtained the polyphenylene sulfide monofilament fiber of 33 dtex. Comparative Example 2 was carried out under these conditions.

[Comparative examples 3 and 4] Except for changing the speed of the coiler and the coiling tension, it was carried out in the same manner as in Example 2, and in Comparative Example 4, a polyphenylene sulfide monofilament fiber of 33 dtex was obtained. Comparative Example 3 was carried out under these conditions.

[Comparative Example 5] 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 and the guide roller 1 was changed using a polyphenylene sulfide resin with an MFR of 300 g/10min. fiber.

[Comparative Example 6] A polyphenylene sulfide monofilament of 33 dtex was obtained in the same manner as in Example 2, except that the speed of the pretension roller and the guide roller 1 was changed using a polyphenylene sulfide resin with an MFR of 65 g/10min. fiber.

[Example 3] A poly(p-phenylene sulfide) resin with an MFR of 160 g/10 min was prepared and melted at a spinning temperature of 328°C. Using a spinning nozzle (L/D=0.35 mm/0.31 mm) having two holes, the melted polyphenylene sulfide was ejected in such a way that the stretched fineness became 10 dtex. The extruded polyphenylene sulfide yarn was cooled by a single-flow cooling device, and the emulsified oil was applied, and the conditions described in Table 1 were set, and it was passed through the pretension roller in the same manner as in Example 1. , The guide rollers 1, 2, 3 are stretched and coiled to the coiler, and the polyphenylene sulfide monofilament fiber of 10 dtex is obtained through the tapered bobbin.

[Example 4] A poly(p-phenylene sulfide) resin with an MFR of 160 g/10 min was prepared and melted at a spinning temperature of 328°C. Using a spinning nozzle (L/D=0.4 mm/0.37 mm) having two holes, the melted polyphenylene sulfide was ejected in such an amount that the stretched fineness became 14 dtex. The extruded polyphenylene sulfide yarn was cooled by a single-flow cooling device, and the emulsified oil was applied, and the conditions described in Table 1 were set, and it was passed through the pretension roller in the same manner as in Example 1. , The guide rollers 1, 2, 3 are stretched and coiled to the coiler, and the polyphenylene sulfide monofilament fiber of 14 dtex is obtained through the tapered bobbin.

[Example 5] Except having set the heat setting temperature of the guide roll 3 to 190 degreeC, it carried out similarly to Example 1, and obtained the polyphenylene sulfide monofilament fiber of 33 dtex.

[Comparative Examples 7 and 8] The polyphenylene sulfide monofilament fiber was produced in the same manner as in Example 1 except that the temperature of the guide roller 1 was changed as shown in Table 1.

[Comparative Example 9] By reducing the speed of the pretension roller and the guide roller 1 of Example 1 so that the elongation becomes 22%, and the temperature of the guide roller 2 is set to 150° C., 33 is obtained in the same manner as in Example 1. dtex polyphenylene sulfide monofilament fiber.

[Comparative Example 10] By increasing the speed of the pretension roller and the guide roller 1 in Example 1 to make the elongation 50%, and setting the temperature of the guide roller 2 to 150°C, it was carried out in the same manner as in Example 1 to obtain 33 dtex polyphenylene sulfide monofilament fiber.

[Comparative Example 11] A polyphenylene sulfide monofilament fiber of 33 dtex was obtained in the same manner as in Example 2 except that the temperature of the guide roll 2 was changed to 190° C. and the take-up tension was changed to 0.6 cN/dtex.

[Comparative Example 12] A polyphenylene sulfide monofilament fiber of 33 dtex was obtained in the same manner as in Example 2 except that the temperature of the guide roller 2 was changed to 110° C. and the package of the bobbin was changed to a drum type.

[Example 6] Change the taper angle to 120°, adjust the take-up speed, change the take-up tension to 0.4 cN/dtex, and change the oil and fat adhesion rate to 0.4% by mass, and perform the same procedure as in Example 1 to obtain a fiber package .

[Example 7] A fiber package was obtained in the same manner as in Example 1, except that the take-up speed was adjusted, the take-up tension was set at 0.5 cN/dtex, and the bias angle was set at 1.2°.

[Example 8] A fiber package was obtained in the same manner as in Example 1, except that the taper angle was changed to 180°, the bobbin shape was changed to a drum shape, and the angle of the twill was changed to 5°.

[Example 9] A fiber package was obtained in the same manner as in Example 1 except that the taper angle was changed to 180° and the bobbin shape was changed to a drum shape.

[Example 10, 11] Except having changed the taper angle to 160 degrees and 20 degrees, it carried out similarly to Example 1, and obtained the fiber package.

[Example 12, 13] Except having changed the twill angle to 0.5° and 2.5°, it carried out similarly to Example 1, and obtained the fiber package.

[Example 14, 15] Except having changed the winding width into 70 mm and 300 mm, it carried out similarly to Example 1, and obtained the fiber package.

[Comparative Examples 13 and 14] Except for changing the speed of the coiler and the coiling tension, it was carried out in the same manner as in Example 2. In Comparative Example 13, a polyphenylene sulfide monofilament fiber of 33 dtex was obtained. Comparative Example 14 was carried out in the same manner as in Example 2 except for changing the speed of the coiler and the coiling tension.

[Comparative Examples 15 and 16] Except having changed the oil and fat adhesion rate to yarn into 0.1 mass % and 0.6 mass %, it carried out similarly to Example 1, and obtained the fiber package.

The production conditions of the polyphenylene sulfide monofilament fibers of Examples 1 to 5 and Comparative Examples 1 to 12, the physical properties of the yarn, and various evaluations (spinning operability, weaving and appearance evaluation, mesh performance evaluation and comprehensive evaluation) ) are shown in Table 1. Furthermore, the strength and elongation of the physical properties of the yarns in the table are breaking strength and breaking elongation. In addition, PTR denotes a pretension roll, GR1 denotes a guide roll 3, GR2 denotes a guide roll 2, GR3 denotes a guide roll 3, and W/D denotes a coiler.

[Table 1] Table 1 resin take up Spinning Operability Package The physicality of yarn fabric Overview MFR PTR GR1 GR2 GR3 W/D Package Fineness strength Elongation 5% modulus 10% modulus Weaving and Appearance Mesh performance speed speed temperature speed temperature speed temperature speed tension g/10mm m/min m/min ℃ m/min ℃ m/min ℃ m/min cN/dtex dtex cN/dtex % cN/dtex cN/dtex Example 1 160 1,040 1,058 115 3,520 135 3,500 unheated 3,495 0.2 〇 latitudinal type 33 3.8 32.0 1.2 1.9 〇 〇 ◎ Example 2 160 920 960 115 3,520 135 - - 3,460 0.2 〇 latitudinal type 33 3.5 31.8 1.1 1.5 〇 〇 ◎ Comparative example 1 160 920 960 115 3,520 110 - - 3,460 0.2 〇 latitudinal type 33 3.3 31.5 1.0 1.4 〇 x x Comparative example 2 160 920 960 115 3,520 260 - - 3,460 0.2 x latitudinal type Unable to collect raw yarn not implemented x Comparative example 3 160 920 960 115 3,520 135 - - 3,430 0.05 x latitudinal type Unable to collect raw yarn not implemented x Comparative example 4 160 920 960 115 3,520 135 - - 3,550 0.6 △ latitudinal type 33 3.9 32.1 1.7 2.5 △ △ △ Comparative Example 5 300 900 920 115 3,520 135 3,500 unheated 3,495 0.2 △ latitudinal type 33 3.2 31.2 1.0 1.4 〇 △ △ Comparative example 6 65 1,120 1,140 115 3,520 135 - - 3,455 0.3 △～× latitudinal type 33 4.1 31.5 1.5 2.6 x x x Example 3 160 940 970 100 3,110 130 3,100 unheated 3,100 0.4 〇 latitudinal type 10 3.9 35.4 1.3 1.8 〇 〇 ◎ Example 4 160 920 940 103 3,110 135 3,100 unheated 3,100 0.3 〇 latitudinal type 14 4.0 34.2 1.4 1.9 〇 〇 ◎ Example 5 160 1,040 1,058 115 3,520 135 3,500 190 3,495 0.2 〇 latitudinal type 33 4.0 32.6 1.4 2.1 〇 〇 ◎ Comparative Example 7 160 1,040 1,058 80 3,520 135 3,500 unheated 3,495 0.2 x latitudinal type Unable to collect raw yarn not implemented x Comparative Example 8 160 1,040 1,058 130 3,520 135 3,500 unheated 3,495 0.2 x latitudinal type Unable to collect raw yarn not implemented x Comparative Example 9 160 920 938 115 3,520 150 3,500 unheated 3,495 0.2 △ latitudinal type 33 4.5 22.0 1.7 2.7 △ △ △ Comparative Example 10 160 1,240 1,258 115 3,520 150 3,500 unheated 3,495 0.2 〇 latitudinal type 33 3.1 50.0 0.8 1.2 △ x x Comparative Example 11 160 920 960 115 3,520 190 - - 3,540 0.6 〇 latitudinal type 33 3.9 30.1 1.7 2.4 △ △ △ Comparative Example 12 160 920 960 115 3,520 110 - - 3,460 0.2 〇 drum type 33 3.3 31.5 1.0 1.4 △ x x

The polyphenylene sulfide monofilament fibers obtained in Examples 1 to 5 are high-strength monofilament fibers with few knots and good quality. Also, the mesh fabric using the monofilament fibers obtained in Examples 1 to 5 has no dross, no broken ends of warp and weft yarns, and no dents or streaks caused by other factors in appearance. Those produced by roving, abnormal luster, etc. are of good quality. Furthermore, it has sufficient strength, good dimensional stability, and high durability and good quality when used as a filter. Among them, the mesh fabrics obtained from the monofilament fibers of Examples 1 and 5 had no dents, streaks, etc., and had particularly excellent performance.

The net-like fabric obtained from the polyphenylene sulfide monofilament fiber obtained in Comparative Example 1 having a low heat-setting temperature had low dimensional stability, dislocations were seen, and low strength durability, which was poor in quality. The reason for this is considered to be that the polyphenylene sulfide monofilament fiber obtained in Comparative Example 1 had low strength and high hot water shrinkage.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 2 with a high heat-setting temperature, the yarn on the guide roller 2 was fused, broken, or wobbled, and the monofilament fiber could not be collected into the bobbin.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 3 in which the winding tension to the coiler was lowered, the yarn was relaxed between the guide roller 2 and the coiler, and the winding on the guide roller 2 or The winding collapse at the bobbin occurred frequently, and the monofilament fiber could not be collected normally to the bobbin.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 4 in which the winding tension to the coiler was increased, since the winding tension was high, if the winding amount exceeded 1 kg, winding constriction would occur, and It is not possible to remove the bobbin from the coiler, so it is not suitable for mass production. In addition, in the weavability of the mesh fabric obtained by thin rolls, since the 5% modulus and the 10% modulus are high, dents are generated in the inner layer of the bobbin, and streaks are generated in the mesh fabric, which is poor quality. By. In addition, due to the heat setting during weaving, the mesh fabric is elongated, and misalignment occurs, which is of poor quality.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 5 using a polyphenylene sulfide resin with a high MFR, its viscosity is very low, and even if the elongation at break is close to 30%, the breaking strength is limited to 3.2 cN/ dtex. Therefore, the durability of the strength of the mesh fabric is reduced, and it is of poor quality.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 6 using a polyphenylene sulfide resin with a low MFR, its viscosity is very high, unmelted matter or gel is likely to occur, and the yarn often occurs on the guide roller. The swing, almost failed to collect monofilament fibers. Knots also exist in monofilament fibers, so warp yarn breakage occurs frequently during weaving. In the obtained mesh fabric, streaks or knots caused by dents are mixed, which are of poor quality, and the quality is quite low.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 7 in which the preheating temperature of the guide roller 1 was lowered, the glass transition temperature of the polyphenylene sulfide was about 10°C lower, so the difference between the guide rollers 1 and 2 The unstretched part is mixed in the stretching between the guide rollers 2, and the yarn of the yarn path will be greatly wobbled after the guide roller 2, and it is almost impossible to wind it to the winding machine, so the monofilament fiber is not wound to the bobbin.

Regarding the polyphenylene sulfide monofilament fiber obtained from Comparative Example 8 in which the preheating temperature of the guide roller 1 was increased, the glass transition temperature of polyphenylene sulfide was about 40°C higher, so the yarn on the guide roller 1 The thread is slack, so large yarn swings occur, and end breaks often occur, so monofilament fibers cannot be obtained.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 9 in which the elongation of the monofilament fiber was reduced to 22%, the elongation was low, and thus yarn breakage easily occurred during spinning. Also, even if it is relaxed, the 5% modulus and the 10% modulus become high, so that dents are generated when the bobbin is unwound. Streaks caused by dents mixed in the mesh fabric using this monofilament fiber are poor in quality. In terms of performance, it inherits the factors produced during weaving, so it is also poor in performance and appearance.

Regarding the polyphenylene sulfide monofilament fiber obtained from Comparative Example 10 in which the elongation of the monofilament fiber was increased to 50%, the spinning operability was good, but the strength, 5% modulus and 10% modulus were quite low, The dimensional stability of the obtained mesh fabric is therefore very poor. The mesh fabric also has dislocations caused by elongation, etc., and its strength and durability are very poor.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 11 in which the heat setting temperature was 190°C and the take-up tension was 0.6 cN/dtex, since the take-up tension is high, if the take-up amount exceeds 1 kg, It will cause winding shrinkage and cannot be disassembled from the coiler, so it is not suitable for mass production. In addition, in the weavability evaluation of the mesh fabric obtained by the thin roll, dents were generated in the inner layer of the bobbin during unwinding, and streaks were generated in the cloth, and the quality was poor. The reason for this is considered to be that the 10% modulus is high.

Regarding the polyphenylene sulfide monofilament fiber obtained in Comparative Example 12 in which the heat-setting temperature was as low as 110°C and the bobbin package was made into a drum shape, the heat-setting temperature was low, the breaking strength was low, and the shrinkage rate in hot water was high. Also, during weaving, since the shape of the bobbin is drum-shaped, the phenomenon that the yarn falls off from the end surface of the bobbin (twill shedding) occurs. Therefore, due to the poor unwinding of the bobbin during weaving, end breaks, etc. occur, and the dimensional stability of the mesh fabric decreases, or the durability of the strength decreases, and the quality is poor.

In this way, the polyphenylene sulfide monofilament fibers obtained in Examples 1 to 5 have excellent spinning operability, almost no streaks, reed marks, dross, yarn knots, and end breaks caused by dents during weaving, and have both High quality with strength. The obtained mesh fabric before and after processing has almost no appearance abnormalities such as stripes caused by misalignment or dents, and has excellent dimensional stability and strength, so it is a high-quality one that can be used for high-performance filters. .

Table 2 shows the production conditions of the polyphenylene sulfide monofilament fibers of Examples 1, 3, 4, 6 to 16 and Comparative Examples 13 to 15, the physical properties of the yarn, and the evaluation results.

[Table 2] Table 2 resin take up Spinning Operability Grease adhesion rate Package The physicality of yarn evaluate Packaging evaluation Overview MFR W/D Package shape Winding width cone angle Twill angle winding state Fineness Breaking strength elongation at break 5% modulus 10% modulus Thermal shrinkage stress ratio of innermost layer Weaving and Appearance Mesh performance Winding speed Coiling tension g/10min m/min cN/dtex quality% mm ° ° dtex cN/dtex % cN/dtex cN/dtex Example 1 160 3,495 0.2 〇 0.3 latitudinal type 200 60 1 〇 33 3.8 32.0 1.2 1.9 1.04 〇 〇 〇 ◎ Example 3 160 3,100 0.4 〇 0.3 latitudinal type 200 60 1 〇 10 3.9 35.4 1.3 1.8 0.89 〇 〇 〇 ◎ Example 4 160 3,100 0.3 〇 0.3 latitudinal type 200 60 1 〇 14 4.0 34.2 1.4 1.9 1.01 〇 〇 〇 ◎ Example 6 160 3,510 0.4 〇 0.4 latitudinal type 200 120 1 〇 33 3.9 31.2 1.4 2.2 0.92 〇 〇 〇 ◎ Example 7 160 3,520 0.5 〇 0.3 latitudinal type 200 60 1.2 〇 33 3.8 31.5 1.5 2.3 0.88 〇 〇 〇 ◎ Example 8 160 3,495 0.2 〇 0.3 drum type 200 180 5 x 33 3.8 32.0 1.2 1.9 1.02 x △ x 〇 Example 9 160 3,495 0.2 〇 0.3 drum type 200 180 1 x 33 3.8 32.0 1.2 1.9 1.01 x △ x 〇 Example 10 160 3,495 0.2 〇 0.3 latitudinal type 200 160 1 x 33 3.8 32.0 1.2 1.9 1.01 x △ x 〇 Example 11 160 3,495 0.2 〇 0.3 latitudinal type 200 20 1 △ 33 3.8 32.0 1.2 1.9 1.03 △ 〇 △ 〇 Example 12 160 3,495 0.2 〇 0.3 latitudinal type 200 60 0.5 x 33 3.8 32.0 1.2 1.9 0.96 x △ x 〇 Example 13 160 3,495 0.2 〇 0.3 latitudinal type 200 60 2.5 △ 33 3.8 32.0 1.2 1.9 1.02 △ △ △ 〇 Example 14 160 3,495 0.2 〇 0.3 latitudinal type 70 60 1 △ 33 3.8 32.0 1.2 1.9 0.97 △ 〇 △ 〇 Example 15 160 3,495 0.2 〇 0.3 latitudinal type 300 60 1 〇 33 3.8 32.0 1.2 1.9 0.98 △ △ △ 〇 Comparative Example 13 160 3,570 0.65 x 0.3 latitudinal type 200 60 1 x 33 3.9 31.1 1.6 2.7 0.83 not implemented x x Comparative Example 14 160 3,440 0.05 x 0.3 latitudinal type 200 60 1 x 33 Unable to collect - not implemented x x Comparative Example 15 160 3,495 0.2 x 0.1 latitudinal type 200 60 1 △ 33 Difficult to collect - not implemented x x Example 16 160 3,495 0.2 〇 0.6 latitudinal type 200 60 1 △ 33 3.8 32.0 1.2 1.9 0.96 x △ x 〇

For physical properties such as breaking strength, elongation at break, 5% modulus, 10% modulus, bobbin shape, coiling tension during coiling, oil adhesion rate to yarn, etc., coiling, winding width, The winding conditions such as taper angle and twill angle are controlled, and the monofilament fibers of the fiber packaging of the polyphenylene sulfide monofilament fibers obtained in Examples 1, 3, 4, and 6 obtained by this can be obtained by direct spinning Manufactured by stretching method, it is a high-quality monofilament fiber with high strength and few knots. Furthermore, such fiber packages are packages with good winding shape, no shape defects such as winding shrinkage, winding collapse, etc., and good unwinding properties, and the thermal shrinkage stress ratio of the innermost layer is also good, uniform and of good quality. . Also, the net-like fabric obtained from the polyphenylene sulfide monofilament fiber rolled into a weft tube package with a tapered portion has no dross, no broken ends of the warp and weft yarns, and no dents or dents in appearance. The quality of stripes, roving, abnormal luster, etc. caused by other factors is good. Furthermore, the strength is sufficient, the dimensional stability is also good, and the durability as a filter is high and the quality is good.

Among them, in Examples 1 and 6, a polyphenylene sulfide mesh fabric with particularly excellent performance was obtained with good fiber physical properties, no dents, streaks, etc.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Example 8 in which the fiber package is drum-shaped and the twill angle is large, since the shape is drum-shaped and the twill angle is 5°, the traverse speed becomes faster, The yarn is easy to deviate outward due to the trend, and it is easy to produce twill shedding, and it becomes a package with poor unwinding performance of the yarn. Due to the poor unwinding of the self-package during weaving, streaks or broken ends occur, which are poor quality.

Regarding the fiber packaging of the polyphenylene sulfide monofilament fiber obtained in Example 9 in which the fiber packaging is drum-shaped, although the shape is drum-shaped, although it is lighter than that of Comparative Example 13, it is still easy to produce twill shedding, which becomes Packaging with poor unwinding performance of yarn. Regarding weavability, the unwinding property from the bobbin is slightly poor, so streaks or end breaks occur, which are poor quality.

Regarding the fiber packaging of the polyphenylene sulfide monofilament fiber obtained in Example 10 in which the fiber packaging is a weft tube type close to the drum type, since the shape is close to the drum type, although it is lighter than that in Example 9, it is still easy. Twill shedding occurs, resulting in a package with slightly poor unwinding properties of the yarn. Regarding weavability, the unwinding property from the bobbin is slightly poor, so streaks or end breaks occur, which are poor quality.

Regarding the fiber packaging of the polyphenylene sulfide monofilament fiber obtained in Example 11 with a very small taper angle, the winding shape is good, but the taper angle is low, so it cannot be rolled to a sufficient amount of winding, and the cost becomes high and production is difficult. Efficiency gets worse. Due to the small amount of winding, yarn junctions (knots) are mixed during bobbin switching during weaving, resulting in a decrease in operating efficiency.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Example 12 with a very small twill angle, the streaks caused by the deflection occurred at the center of the winding bobbin surface and continued to occur during winding. Therefore, the appearance was poor, and the unwinding property was slightly inferior. Therefore, if streaks or broken ends occur during weaving, they are of poor quality.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Example 13 with a large twill angle, slight twill shedding occurred at the taper portion, resulting in a package with poor unwinding properties of the yarn. Therefore, if there are slight streaks or broken ends during weaving, it is a poor quality product.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Example 14 with a small winding width of the package, the winding shape is good, but the winding width is low, so it cannot be rolled to a sufficient winding amount, and the cost becomes lower. High and poor production efficiency. Due to the small amount of winding, yarn junctions (knots) are mixed during bobbin switching during weaving, resulting in a decrease in operating efficiency. Mesh performance is good.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Example 15 with a large winding width of the package, the winding shape is good, but it is easy to produce dents when the innermost layer is unwound, and after weaving Mesh fabric produces stripes and is of poor quality.

Regarding the fiber packaging of the polyphenylene sulfide monofilament fiber obtained in Comparative Example 13 where the coiling tension on the coiler was high, the 10% modulus became high due to the high coiling tension, and the coiling of more than 1 kg At the point in time, the coiling machine produced winding shrinkage, and the fiber package could not be collected. Furthermore, the thermal shrinkage stress ratio of the outermost layer collapsed greatly, resulting in poor-quality monofilament fibers.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Comparative Example 14 in which the coiling tension to the coiler was low, the yarn was slackened between the guide roller 3 and the coiler due to the low coiling tension. Difficulty winding to coiler, failure to collect fiber packs.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Comparative Example 15, which has a low oil and fat adhesion rate to the yarn, the end breakage occurred due to the vibration of the yarn on the guide roller due to the low oil and fat adhesion rate. Failed to collect enough volume.

Regarding the fiber package of the polyphenylene sulfide monofilament fiber obtained in Example 16, which has a high oil and fat adhesion rate to the yarn, the yarn wound on the bobbin tends to slip, so that the yarn falls off from the tapered part and the yarn falls off in diagonal lines, which becomes bad apperance. In addition, the unwinding performance of the bobbin is poor, and streaks, end breaks, and dross are generated during weaving, and the quality is poor.

In this way, the fiber packaging of the polyphenylene sulfide monofilament fibers obtained in Examples 1, 3, 4, 6, and 7 has no winding shrinkage, insufficient winding volume, yarn deviation, and twill shedding. The difference in quality is small, there is no breakage during unwinding during weaving, almost no dents during weaving or stripes, reed marks, dross, and end breaks caused by unwinding, and it has high strength and high quality. The obtained mesh fabric before and after processing has almost no appearance abnormalities such as stripes caused by misalignment or dents, and has excellent dimensional stability and strength, so it is a high-quality one that can be used for high-performance filters. . The spinning operability of the polyphenylene sulfide monofilament fibers obtained in Examples 8-16 is "0", and the mesh performance is "△" or "0", but the weaving property or appearance in the packaging evaluation Not enough.

none

[ Fig. 1 ] is a schematic front view of a fiber package of the polyphenylene sulfide monofilament fiber of the present invention.

Claims (9)

A polyphenylene sulfide monofilament fiber, characterized in that its main constituent unit is a phenylene sulfide unit, and satisfies (1) to (5): (1) The fineness is 6-35 dtex; (2) The breaking strength is above 3.4 cN/dtex; (3) The elongation at break is 24-45%; (4) 5% modulus is 1.0~1.6 cN/dtex; (5) The 10% modulus is 1.4 to 2.3 cN/dtex. A weft-shaped fiber package, which is composed of the polyphenylene sulfide monofilament fiber as claimed in claim 1. Such as the fiber packaging of polyphenylene sulfide monofilament fiber in claim 2, the winding width is 100-250 mm, the taper angle is 30-140°, the twill angle is 0.6-2°, and the heat shrinkage stress ratio of the innermost layer 0.85 to 1.15. A method for manufacturing polyphenylene sulfide monofilament fibers as claimed in claim 1, which is obtained by melt-extruding polyphenylene sulfide resin whose main constituent unit is a phenylene sulfide unit, cooling and solidifying, and not temporarily coiling A method for producing polyphenylene sulfide monofilament fibers by a direct spinning stretching method of continuously stretching unstretched yarns and coiling them with a coiler, which is characterized in that (1) to (4): (1) The MFR of polyphenylene sulfide resin is 100-250 g/10min; (2) When stretching the unstretched yarn, use an unheated pretension roller and more than two heated guide rollers to stretch; (3) The temperature of the first guide roller is 95-120°C, and the heat setting temperature of the heating guide roller after the second guide roller is 120-250°C; (4) The coiling tension of the coiler is 0.1~0.5 cN/dtex. A method for manufacturing fiber packaging according to claim 2 or 3, which is to melt and extrude polyphenylene sulfide resin, cool and solidify, and then stretch the obtained unstretched yarn continuously without temporarily winding it and coil it A method for manufacturing a fiber package composed of polyphenylene sulfide monofilament fibers whose main constituent unit is a phenylene sulfide unit by direct spinning and stretching method that is wound up by a machine to a bobbin, characterized in that (1)～( 4): (1) The MFR of polyphenylene sulfide resin is 100-250 g/10min; (2) When stretching the unstretched yarn, use an unheated pretension roller and more than two heated guide rollers to stretch; (3) The temperature of the first guide roller is 95-120°C, and the heat setting temperature of the heating guide roller after the second guide roller is 120-250°C; (4) The coiling tension of the coiler is 0.1~0.5 cN/dtex. A method of manufacturing fiber packaging made of polyphenylene sulfide monofilament fibers, which melts and extrudes polyphenylene sulfide resin, cools and solidifies it, and stretches the obtained unstretched yarn continuously without temporarily winding it And use the coiling tension of 0.1～0.5 cN/dtex on the coiler to directly spin and stretch the weft-shaped bobbin to manufacture polyphenylene sulfide monofilament fibers whose main constituent units are phenylene sulfide units. Composed of fiber packaging. According to the method of manufacturing fiber packaging made of polyphenylene sulfide monofilament fibers as claimed in claim 6, the obtained polyphenylene sulfide monofilament fibers are made to adhere to the oil and fat in such a manner that the oil and fat adhesion rate becomes 0.15 to 0.5% by mass. After the yarn is not drawn, it is drawn and wound up to bobbins. A method of manufacturing fiber packaging made of polyphenylene sulfide monofilament fibers, which is obtained by melting and extruding polyphenylene sulfide resin, cooling and solidifying, and making the obtained unstretched yarn continuous without temporarily winding A method of manufacturing a fiber package composed of polyphenylene sulfide monofilament fibers whose main constituent unit is a phenylene sulfide unit by stretching and using a coiler to wind up a weft-shaped bobbin for direct spinning and stretching, characterized in that : Before winding the undrawn yarn into the bobbin, grease is applied so that the grease adhesion rate of the polyphenylene sulfide monofilament fiber becomes 0.15-0.5% by mass, so that the winding width becomes 100-250 mm, the taper angle It becomes 30-140°, and the twill angle becomes 0.6-2°, and is wound into a weft tube on the bobbin. A polyphenylene sulfide monofilament fiber weft tubular fiber package, the winding width is 100-250 mm, the cone angle is 30-140°, the twill angle is 0.6-2°, and the heat shrinkage stress ratio of the innermost layer is 0.85- 1.15.

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