TWI527945B - Ultrafine polyamid fiber - Google Patents

Description

Polyamide fine fiber

The present invention relates to a very fine polyamide fiber having a single yarn fineness, which relates to an excellent softness, smoothness, drape, high water absorption, high density and high dyeing property to the knitted fabric. Textured polyamide fine fiber.

Polyimine fiber has many excellent properties as a mechanical property first, and therefore can be widely used in clothing applications and industrial materials. Among the clothing materials, false twisted yarns are widely used in the use of fabrics, knitted fabrics, etc., and the production amount is also considerable. In particular, extremely fine false twisted textured yarns with a single yarn fineness of 1.2 dtex or less can provide an extremely soft hand when made into a fabric, and the heat retention and water absorption are improved even more than the conventional single yarn fineness false twisted textured yarn. . Therefore, the demand for extremely fine false twisted textured yarns in the market has become a basic one.

For the above-mentioned polyamide fine fiber, a fiber made of polyamidamide fiber having a single yarn fineness of 1.2 dtex or less is used, and a false twist for a predetermined coefficient of friction, elongation, and hot water shrinkage is used. The amine ultrafine fiber is a polyamide fine fiber which can impart a soft feeling to the woven fabric (Patent Document 1).

Further, in the polyamide fibers having a single yarn fineness of 1.2 dtex or less, when the stress of the yarn of the yarn is 15%, and the opening of the cross-linked fiber portion is longer than the predetermined polyamide yarn for the false twist, the softness can be obtained. Polyamide fibers are used for the false twist of the false twisted yarns (Patent Document 2).

As a method of uniformly applying an oil agent to the polyamide fine fibers, a polymer which is discharged from a spinning nozzle in which a discharge hole is arranged in a ring shape is proposed, and is sprayed from the inner circumference or the outer circumference of the yarn. A cold air device that blows cold air, a so-called annular chimney, uniformly cools a single yarn, and applies an oil agent to the oil supply guide portion with the gauze interposed therebetween (Patent Document 3).

Further, on the downstream side of the spinning nozzle including a plurality of discharge holes arranged in a ring shape, the plates disposed inside the plurality of long fibers discharged from the discharge holes are brought into contact with the individual yarns, and the oil agent is uniformly supplied to the single yarn. Yarn room (Patent Document 4).

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2005-320655

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2009-84749

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2007-126759

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2010-126846

However, when the ultrafine polyamide fibers having a single yarn fineness of 0.5 dtex or less are further produced by the methods described in Patent Documents 1 and 2, it is difficult to uniformly cool or impart a uniform oil agent. The homogeneity of the guanamine fiber and the texture of the fluff are deteriorated, and the difference in fiber structure between the single yarns is increased. As a result, when the false twisting is applied, the processed yarn is broken and unwound, and the woven fabric is supplied. At the time of the warping, the fluff of the warp is more remarkable, the smoothness or texture of the fabric is lowered, and the defects such as staining are remarkably generated after dyeing.

In order to solve this problem, when the oil supply method described in Patent Document 3 is applied, the yarn is aggregated and bundled to provide an oil agent. When the single yarn has a fineness of less than 0.5 dtex, the strength of one single yarn is reduced. When the yarn is bundled, the single yarn will be rubbed, and the fiber before the oil agent will have a special problem of large friction coefficient. . Therefore, the friction between the single yarns, the friction between the single yarns before the oil agent and the guide portion causes the single yarn to break, and it is difficult to impart the oil to the inner yarn of the bundle of the bundles, and oil is generated between the single yarns. There is a disadvantage that the adhesion between the agent and the water is poor, or the fiber structure is poor between the single yarns, so that the texture is lowered after the dyeing.

Further, when the method described in Patent Document 4 is applied, it is advantageous to impart a uniform oil agent between the single yarns, but it is difficult to impart uniform oil in the longitudinal direction of the fibers, and oil agent adhesion does not occur in the long direction. In the meantime, the difference in the structure of the fibers in the long direction or the unevenness in the friction coefficient becomes large. Therefore, in the spinning step and the high-order processing step, friction with the yarn guide or the like causes unevenness in the longitudinal direction, and staining occurs after the dyeing, and there is a drawback that the fabric having high texture cannot be obtained.

An object of the present invention is to solve the above problems of the prior art and to provide a fabric which can provide excellent flexibility, smoothness, drape, high water absorption, high density, and high texture after dyeing. Indole very fine fiber.

The present invention has the following configuration in order to solve the above problems.

(1) A polyamidamide ultrafine fiber characterized in that, in a polyamide fiber having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less, the average number of fluff per 12000 m in the longitudinal direction of the long fiber is 1.0 or less.

(2) The polyamine fine fiber according to the above (1), wherein the Uster unevenness in the longitudinal direction of the long fibers is 1.0% or less.

(3) The polyamidamide ultrafine fiber according to the above (1) or (2), wherein the total fineness is 15 to 300 dtex, and the number of long fibers is 30 or more.

(4) The polyamidamide ultrafine fiber according to any one of the above (1) to (3) wherein the cross-sectional shape of the long fiber is a profiled cross section.

(5) The polyamidamide ultrafine fiber according to any one of the above (1) to (3), which has a single-yarn in which the cross-sectional shape of the long fiber is circular, and has a circle The orientation parameter of the single yarn of the cross-sectional shape, the ratio of the orientation parameter of the surface portion of the single yarn to the orientation parameter of the central portion of the monofilament is 1.10 or more.

(6) A method of melt spinning of polyamide fine fibers, which is a polyaniline microfiber having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less and an average number of fluffs of 1.0 or less per 12000 m in the longitudinal direction of the long fiber. The melt spinning method is characterized in that a spinning nozzle having a circumferential discharge hole is provided from an outer peripheral portion of the spinning nozzle, and the spun melted spun yarn is used below the center portion of the spinning nozzle. And cooling the cooling spinning device from the inside or the outside of the melt spun yarn spun from the discharge hole to cool the melt spun yarn, and further cooling the outer periphery of the disk with the lower side of the cooling device The disk-shaped guide portion that contacts the single yarn and the annular oil supply device that forms the annular slit for oil discharge formed along the outer periphery of the guide portion directly above the guide portion are supplied to the oil, and then the bundle-guide type oil supply device In the middle, the yarns are gathered into a bundle and the oil supply in the second stage is performed.

(7) The method of melt spinning of polyamide fine fibers according to the above (6), wherein the cooling device blows cooling air from the inside of the melt spun yarn spouted from the discharge hole to cool the melt spun yarn Cooling device.

(8) The method of melt spinning of polyamide fine fibers according to the above (6) or (7), wherein the cooling device satisfies the following conditions: (i) The distance (L) from the spinning nozzle face to the cooling start position of the cooling device is 10 mm ≦ L ≦ 70 mm, and (ii) the cooling wind blown at the cooling start position has a wind speed of 15 to 60 m/min.

(9) A melt spinning device of polyamide fine fibers, which is a polyamide fine fiber having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less and an average number of fluffs per 1.02000 m in the longitudinal direction of the long fiber of 1.0 or less. The melt spinning device is characterized in that: a spinning nozzle having a discharge hole arranged in a circumferential shape from an outer peripheral portion of the spinning nozzle, and a melt-spun yarn which is discharged from the discharge hole below the center portion of the spinning nozzle a cooling device that blows cooling air on the inner side or the outer side to cool the molten spun yarn, and further has a disc-shaped guide portion that contacts the single yarn at the outer periphery of the disc in the vertical direction of the cooling device An annular oil supply device for forming an annular slit for oil discharge formed on the outer periphery of the guide portion directly above the guide portion; and a bundle guide for supplying the yarn to the downstream portion and performing the second stage of oil supply Type oil supply device.

(10) The melt spinning device of the polyamide fine fiber according to (9), wherein the cooling device blows cooling air from the inside of the melt spun yarn spouted from the discharge hole to cool the melted spun yarn. Device.

According to the present invention, in the polyamide fibers having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less, the average number of fluff per 12,000 m in the longitudinal direction of the long fibers is 1.0 or less, and the conventional polyfluorene can be obtained. The knitted fabric which is not obtained by the amine fiber imparts excellent flexibility, smoothness, drapability, high water absorbability, high density, and high texture after dyeing. In a further preferred embodiment, excellent barrier properties can also be imparted.

[Formation of the Invention]

Hereinafter, embodiments of the present invention will be described in detail.

A homopolymer or copolymer of polyamines used in the polyamide fine fibers of the present invention, which are salts of endamides, aminocarboxylic acids or diamines and dicarboxylic acids. A melt-formable polymer having a guanamine bond formed.

The polyamine can be used without any particular limitation. In terms of fiber forming ability and mechanical properties, polycaprolactam (nylon 6) and polyhexamethylene hexamethyleneamine (nylon 66) are used. ) is better. The copolymer of polyamines such as nylon 6, nylon 66 or the like may be copolymerized with other aminocaproic acid or decylamine in a ratio of 20 mol% or less based on the total monomer unit.

The relative viscosity of the sulfuric acid of the polyamine used in the present invention is preferably from 2.0 to 3.5, more preferably from 2.4 to 3.0, and most preferably from 2.5 to 2.7, from the viewpoint of yarn stability. The method for measuring the relative viscosity of the above sulfuric acid is based on the following.

In the polymer of the present invention, the second and third components may be copolymerized or mixed in addition to the main component, without departing from the object of the present invention.

In particular, in addition to the object of the present invention, when it is desired to impart hygroscopicity, polyvinylpyrrolidone can be contained in polyamine.

In the polyamine used in the present invention, various additives such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorbing agent, a (crystalline) nucleating agent, and a fluorescent color increase can be mixed as needed. White agent, etc.

The method for producing the polyamidamide ultrafine fiber of the present invention is not particularly limited as long as the polyamine fine microfiber of the present invention can be obtained. It is preferred to use a method in which the polyamide is first melted and disposed from the outer peripheral portion of the spinning nozzle. The circumferential discharge hole is ejected (melted spun yarn), and the melt spinning is uniformly applied to the inside or the outside of the melt spun yarn discharged from the discharge hole below the nozzle center portion by using the blowing cooling air. After cooling the cooling device for rapid cooling of the sliver, the oil is supplied to each single yarn by an annular oil supply device below the vertical direction of the cooling device, and then the yarn is aggregated in the bundle-guided oil supply device. Bundle and carry out the oil supply in the second paragraph. After the second stage is supplied with oil, the first step of winding the package into a package after the interlacing is necessary, and it is preferable to obtain the point and cost of the polyamide fiber having a small thickness unevenness or a small amount of fluff. At the same time, in terms of the cooling device, it is preferred to use an annular cooling device to blow a cooling air from the inside of the spinning sliver running on the circumference to the outside, and to blow the annular cooling device from the outside of the spun yarn. It is preferable to blow the annular cooling device inside the inside of the cooling air, and it is particularly preferable that the outer-ring type annular cooling device is better.

One of preferred examples of the method for producing a polyamide fiber of the present invention will be specifically described with reference to Figs. 1 and 5 . Figs. 1 and 5 are schematic views showing an example of a manufacturing process of the synthetic fiber of the present invention, and Fig. 1 is an example of using the outer-blow type annular cooling device 3, and the fifth drawing is an inner blowing type ring. Another example of a type of cooling device 18. In the following description, the basic configurations of the manufacturing steps of the first drawing and the fifth drawing are the same, and the description of the common symbols will be omitted.

In Fig. 1, the molten polyamine is discharged from the nozzle 1, passes through the nozzle under-heating zone 2, and is cooled by a blow-type annular cooling disposed below the center of the nozzle for the purpose of reducing unevenness in the long direction. In the apparatus 3, the cooling air is blown from the inner side of the spun yarn to the outside, and the single yarns are rapidly cooled and solidified from the nozzle surface at a uniform distance. Further, it is preferable that the disk-shaped guide portion that contacts the single yarn at the outer peripheral portion of the disk and the oil-discharge ring that is formed along the outer periphery of the guide portion directly above the guide portion are provided before the yarn is gathered into the bundle. After the oil supply device 4 of the slit is supplied with oil for each single yarn, the yarn bundles are gathered into a bundle in the bundle-guide type oil supply device 5, and the oil supply in the second stage is performed. After the oil is supplied, it may be staggered in the staggered nozzles 6 as necessary, and the winding roller 7 and the stretching roller 8 are wound by a winder (winding device) 9. In addition, 10 series fiber long fiber and 11 series fiber product packaging. Further, before being wound into a package, the film can be stretched by two or more rolls. In this case, the stretching is caused by the stretching, and the stretching ratio can be reduced or stretched. Interlaced.

In the under-nozzle holding zone 2, the vapor is sprayed toward the nozzle surface and the sub-nozzle holding zone 2 is filled with steam, and the polymer contained in the nozzle periphery of the nozzle and the oligomer contained in the polymer react with oxygen. It is suitable for curing because it has an effect of suppressing so-called nozzle contamination. At this time, the discharge pressure of the steam is preferably 0.1 to 0.5 kPa, and when the discharge pressure is too small, the oxygen concentration in the holding area under the nozzle is increased, the suppression effect of the nozzle surface contamination is small, and when the discharge pressure is too large, the spun yarn is caused to be spit. Swing, and thus related to the deterioration of Uster unevenness.

When the spun yarns arranged on the circumference of the circle are cooled, the annular type cooling device is used, and the cooling air is blown to the outside of the yarn to form a blown air, which is low in the production of polyamine from the nozzle. The polymer component or the vapor that seals the nozzle surface is not retained in the inside of the spinning device and is opened to the outside, so that it is suitable.

In the manufacturing step of Fig. 1 described above, the outer-blow type annular cooling device 3 is used, but the inner-blow type annular cooling device 18 shown in Fig. 5 may be used instead of the outer-blown annular cooling device. 3. The inner-blow type annular cooling device 18 is disposed below the center of the nozzle so as to surround the spun yarn, and blows the cooling air from the outer side of the spun yarn to the inner side so that each single yarn is uniform from the nozzle surface. The distance is rapidly cooled and solidified.

The cooling starting point distance, that is, the distance (L) from the nozzle face to the upper end of the cooling air blowing portion in the annular cooling device is preferably 10 to 70 mm, more preferably 10 to 60 mm, and further 10 to 50 mm. good. When the distance between the cooling start points is too short, the cooling air blown from the annular cooling device is in the vicinity of the nozzle surface, and the discharge stability of the thermoplastic polymer is deteriorated due to the decrease in the nozzle surface temperature, and the spun yarn is broken or the pile is increased. Further, when the distance from the cooling start point is too long, since the polyamine is solidified before the uniform cooling and rapid cooling by the cooling air is performed, the long-term fineness variation (Uster unevenness) of the fiber tends to become large. When the fabric is made, there is a tendency to lower the texture.

The cooling air in the annular cooling device preferably has a wind speed of 15 to 60 m/min, more preferably 20 to 55 m/min, and even more preferably 25 to 50 m/min. When the cooling wind speed is too small, the uniformity of the single yarn and the rapid cooling become insufficient, or the expansion of the cooling sliver is too small, so that the swing of the yarn is liable to cause an increase in the Uster unevenness due to the interference. Further, in the case where the polymer is insufficiently cooled and comes into contact with the guide portion, the fluff or the spun yarn breaks frequently, so that the texture at the time of fabric formation is deteriorated. When the cooling wind speed is too large, the yarn is slightly vibrated by applying tension to each of the single yarns to increase the Uster unevenness, and the yarn breakage is increased at the time of spinning.

The temperature of the cooling air in the annular cooling device is preferably 5 to 50 ° C, preferably 10 to 40 ° C, more preferably 15 to 35 ° C. When the temperature of the cooling air is too low, the temperature of the holding zone under the nozzle is lowered, and the temperature of the nozzle surface is lowered. Therefore, the strength of the sliver tends to decrease, and when the temperature of the cooling wind is too high, it is difficult to uniformly cool the sliver, and it is easy to Insufficient cooling of the sliver, in addition to the increase in Uster unevenness, there is also a tendency to increase the yarn breakage during spinning.

The length of the cooling air blowing portion in the annular cooling device is preferably from 100 to 500 mm in length, preferably from 150 to 400 mm, more preferably from 200 to 350 mm. When the cooling air blowing length is too long, the tension applied to the single yarn increases, causing the spinning to break. When the cooling air blowing length is too short, the oil is added due to insufficient cooling of the single yarn, resulting in a reduction in the pile. And the yarn breaks.

The single yarn passing through the annular cooling device can be processed by the annular oil supply device. The annular oil supply device is disposed inside the spinning sliver running on the circumference.

Fig. 4 is a conceptual view showing an example of a ring-shaped oil supply device to which the present invention is applied. The annular oil supply device 4 includes an oil discharge slit 12 and a disk-shaped guide portion 13. The annular oil supply device 4 is disposed such that the fiber filaments (single yarn) 14 passing through the annular oil supply device contacts the disk-shaped guide portion 13. An annular oil discharge slit 12 is formed along the outer circumference of the disk-shaped guide portion 13 so that the oil agent is supplied directly above the contact point with the sliver in the disc-shaped guide portion 13. The oil agent is supplied to the oil reservoir 15 by the oil supply pipe 17. The oil agent filled in the oil agent storage tank 15 is discharged from the oil discharge opening slit 12, and is in contact with each single yarn of the discharge sliver at the contact point with the sliver in the disc-shaped guide portion 13, for each single yarn. An oil agent is added.

The single yarn passing through the annular cooling device is brought into contact with the disc-shaped guiding portion to prevent the single yarn from being blown by the cooling wind, thereby promoting uniform cooling of the single yarn and reducing the unevenness of the Uster. Therefore applicable. Further, before the yarns are gathered into the bundle, the annular slit for discharging from the oil is formed along the outer circumference of the guide portion directly above the contact point with the sliver in the disc-shaped guide portion. A method of using an oil-repellent agent to give an oil agent to each of the single-yarn annular oil supply devices, the yarn having a high frictional resistance before the oil agent is applied, or the yarn is brought into contact with the disk-shaped guide portion, or when the yarn is gathered into a bundle The single yarn which is not provided with the oil agent is rubbed to suppress the effect of the pile generation, and the uniform oil which cannot be imparted between the single yarns is provided by the bundle-guide type oil supply device, so that the spinning step can be performed by the spinning step The middle yarn guide portion and the single yarn which is not provided with the oil agent suppress the generation of the pile and the occurrence of the stain during the dyeing, and are suitable for obtaining fibers having high order workability. Further, the position of the oil agent to be supplied via the annular oil supply means is preferably from 300 to 1000 mm below the nozzle surface, preferably from 350 to 700 mm, more preferably from 400 to 600 mm. When the oil supply position is too high, the oil agent is directly applied due to insufficient cooling of the single yarn, resulting in a decrease in the strength of the long fiber and the generation of the pile. When the oil supply position is too low, the single yarn spouted from the nozzle surface is The distance between the gathered bundles becomes longer, so it is easy to cause the yarn to oscillate. In addition to the causes of the fluff and the deterioration of the Uster unevenness, the airflow effect accompanying the single yarn is increased, thereby causing the tension of the running sliver to increase. The spinning breaks. The type of the oil agent to be applied to the annular oil supply device is not particularly limited, and is preferably a gel type. In the gel oil agent, the oil film is easily formed on the guide portion due to the surface tension, and the oil agent can be uniformly applied along the circumferential direction of the disk-shaped guide portion.

After the oil supply in the annular oil supply device 4 is performed, in addition to the single yarn being integrated into the bundle, the bundle-guided oil supply device 5 further adopts a method of supplying the oil supply in two stages, since the fiber can be used in the single It is suitable for the application of a uniform oil agent on both sides of the yarn and the long direction. In the annular oil supply device 4, the oil agent can be uniformly applied between the single yarns, but it is difficult to obtain a fiber which uniformly imparts an oil agent to the longitudinal direction, and the bundled guide type which can uniformly apply the oil agent in the longitudinal direction can be obtained. The oil supply device 5 and the two-stage oil supply method of the annular oil supply device 4 can uniformly apply an oil agent between the single yarns of the fibers and the two sides of the long direction, thereby obtaining a dyed texture with good texture. Amine very fine fiber.

In addition, a general oil supply guide portion can be used for the bundle-guide type oil supply device used for the second-stage oil supply. For example, the oil supply guide portion as disclosed in Patent Document 3 can be applied.

The drawing speed of the sliver in the take-up roll 7 is preferably from 3,500 to 4,500 m/min. When the drawing speed is too low, the orientation of the polyamide in the long direction becomes unstable, and the stain in the long direction is likely to occur. When the drawing speed is too high, the tension applied to the sliver is increased, thereby causing fluff and The yarn breaks. Further, the stretching ratio of the stretching roll 8 is preferably from 1.0 to 1.3. When the draw ratio is too high, the elongation of the obtained fiber becomes too low, and the single yarn is broken to easily cause the pile to be generated.

The polyamine fine fiber of the present invention needs to have a single yarn fineness of 0.1 dtex or more and 0.5 dtex or less, preferably 0.25 dtex to 0.45 dtex. When the single yarn fineness is too coarse, the rigidity of the sliver becomes high, and when the knitted fabric is formed, it is difficult to obtain a desired knitted fabric having excellent flexibility, smoothness, drapability, high water absorbability, and high density, and vice versa. When it is too fine, single yarn breakage tends to occur when the fabric is formed, and there is a tendency that the fabric is rough or smooth, and the texture of the fabric tends to deteriorate after dyeing due to an increase in Uster unevenness. The measurement of the single yarn fineness is based on the method described later.

The polyamidamide ultrafine fiber of the present invention is required to have an average number of fluff per 1.02000 m in the longitudinal direction of the long fiber of 1.0 or less. When the average number of fluffs is more than 1.0, there will be a generation of warp fluff during the weaving or a case where the processed yarn is broken or unwound during the false twisting process, and even when the braid is formed, the smoothness will be lacking. And texture. Preferably, the average number of fluff per 12000 m in the longitudinal direction is 0.5 or less, and more preferably 0. In order to reduce the number of piles, it is preferable to prevent the friction between the single yarns having high frictional resistance before the application of the oil agent, and it is preferable to apply the oil agent before the bunching by the above-mentioned annular oil supply guide. The measurement of the average number of fluffs described above is based on the method described later.

The fiber system exhibits a change in the sliver of the sliver in the general long direction, and the portion where the sliver is thick during dyeing tends to be densely stained, and particularly when the single yarn has a small fineness, it is remarkably exhibited. When the thickness unevenness of the fiber is large, the leveling property of the knitted fabric is lowered to impair the appearance. Therefore, the unevenness (thickness unevenness) is preferably 1.0% or less. When the Uster unevenness is too high, the smoothness and the difference in shading during dyeing are greatly exhibited, and the texture of the product tends to be inferior. The Uster unevenness is preferably 0.9% or less. The method for reducing the unevenness is not particularly limited, but a method of blowing the annular cooling air from the outer circumference and/or the inner circumference by applying the cooling air blowing device to the nozzle surface and rapidly cooling the method is applicable. . More preferably, it is a method of preventing the yarn from swinging by blowing a ring-shaped cooling air from the inner circumference of the sliver to uniformly cool the single yarn, and then bringing the single yarn into contact with the disc-shaped guide portion. In the present invention, the measurement of the Uster unevenness (thickness unevenness) is based on the method described later.

When the polyamine fine fiber of the present invention comprises a single yarn having a circular cross-sectional shape, it is preferred that the orientation parameter of the surface portion differs from the orientation parameter of the central portion in the single yarn. When the orientation parameter of the surface portion and the central portion are different, the refractive index of the light at the central portion and the surface portion of the polyimide fine microfiber is different, and a barrier effect can be obtained even in a circular cross section. Specifically, the ratio of the orientation parameter of the surface portion of the single yarn to the orientation parameter of the central portion of the single yarn is preferably 1.10 or more, more preferably 1.15 times or more and 2.00 times or less, and more preferably 1.20 or more and 1.80 times or less. With respect to the orientation parameter of the central portion of the single yarn, when the orientation parameter of the surface portion is in the above range, since the light is diffused by the light in the cross-sectional direction of the single yarn, the anti-transparent effect and the fiber can be obtained when the fabric is formed. The deformation in the internal structure is not excessively large, and sufficient long fiber strength can be maintained. The measurement of the above orientation parameters is based on the method described later. The polyamidamide ultrafine fiber having such an orientation parameter can be obtained by selecting the above-mentioned preferable conditions in order not to make the cooling starting point distance too long and not to make the cooling wind speed (cooling wind speed) too small.

The polyamide fine fiber of the present invention has an extremely fine single yarn fineness, and the orientation parameter of the surface portion and the orientation parameter of the central portion can be obtained by uniformly and rapidly cooling the melt-spun yarn. The fibers having different configurations have a tendency to increase the ratio of the orientation parameters of the surface portion of the single yarn to the orientation parameter of the central portion of the single yarn by using a cooling condition which can be more rapidly and uniformly cooled.

Further, the polyamide fine fiber has an elongation of 40 to 70%. When the elongation is too low, the tensile strength of the long fiber is increased, and the number of false twists in the false twisting process is reduced. Therefore, it is difficult to impart sufficient crimping to the obtained processed yarn, and the yarn is broken in the drawn yarn. And the fluff is easy to occur, and the high-order pass is inferior. In addition, when the stretch is too high, the actual number of false twists is excessive, and the obtained processed yarn is easy to fluff and the strength is lowered. The residual elongation is high, and streaks are likely to occur in the woven fabric, and the texture tends to be deteriorated. The above-described measurement of the elongation is based on the method described later.

Further, the stress at which the obtained polyamine fine fiber is elongated by 15% is preferably 1.0 to 2.0 gf/dtex (9.8 × 10 ^-3 to 19.6 × 10 ^-3 N/dtex), and 1.2 to 1.8 gf/dtex (11.8 ×). 10 ^-3 to 17.6 × 10 ^-3 N / dtex) is better. When the stress at the time of elongation of 15% is too low, the tension at the time of false twisting becomes too low, the processed yarn is broken, or the processing tension is liable to be changed, and the texture of the processed yarn is lowered or the yield is easily deteriorated. Further, when the stress at the time of elongation of 15% is too high, when the false twisting is performed, the tension in the interlaced portion is concentrated and the single yarn is broken, and the passability of the step or the texture of the knitted fabric is likely to be lowered. The measurement of the stress at the time of elongation of 15% is based on the method described later.

The polystyrene ultrafine fibers of the present invention preferably have a total fineness of 15 to 300 dtex, preferably 15 to 200 dtex. When the total fineness is too small, the breaking strength of the fiber becomes small, and the tear strength of the fabric becomes small when the fabric is formed. When the total fineness is too large, the dye hardly penetrates into the inside of the fiber during dyeing, and is likely to be stained after dyeing and is difficult to obtain. High-quality fabric. The measurement of the above total fineness is based on the method described later.

The polyamine fine fiber of the present invention preferably has a long fiber number of 30 or more, preferably 30 to 500 long fibers, and more preferably 50 to 400 long fibers. When the number of long fibers is less than 30, it is difficult to obtain excellent flexibility, drapability, high water absorbability, and high density. When the number of long fibers is too large, it is difficult to uniformly provide staggering, and it is easy to deteriorate the unwinding property. The uniformity of the oil agent between the long fibers is difficult to increase, and it is easy to increase the generation of the fluff which causes the breakage of the single yarn.

The cross-sectional shape of the polyamidamide ultrafine fiber of the present invention is not particularly limited, and examples thereof include a circular cross section and a profiled cross section. The profiled section may be, for example, a flat profile, a lens profile, a three-leaf profile, or a six-leaf profile, that is, a profile having a profile of 3 to 8 protrusions and the same number of recesses, and a hollow profile. Known profiled profile. The preferred cross section is a circular cross section which is excellent in that it imparts stability to the spinning and excellent flexibility and drape. Further, when the ratio of the above-described preferred orientation parameter is large in the central portion of the circular cross section and the surface portion of the polyamidamide ultrafine fiber, the light passing through the cross-sectional direction of the single yarn is diffusely reflected by the difference in the orientation structure, and Since the leaf section, the multi-concave section, and the hollow section are diffusely reflected by the light of the surface of the single yarn, it is preferable that the barrier property is obtained by diffuse reflection of the transmitted light when the fabric is formed. Furthermore, the three-leaf section, the multi-concave section, and the cross-section of the multi-concave section and the long section of the circular section can be used to form a woven fabric, and a high gap can be obtained between the single yarns, resulting in high water absorption due to capillary action. It is excellent in that it can impart high bulk density, and it is also suitable for imparting barrier properties by diffuse reflection of transmitted light.

The polybenzazole ultrafine fiber of the present invention thus obtained imparts excellent softness, smoothness, drapability, high water absorption, high density, and high texture after dyeing to the woven fabric, and in a preferred aspect, is resistant to penetration. Sex is also excellent. Therefore, when the ultrafine fiber of the present invention is used as a woven fabric, it can be applied to a down material such as a fabric of a feather coat excellent in heat retention and light weight; and when a woven fabric is produced, a lining having a high-grade feeling of the above-described function can be applied. And covered yarns used in underwear, etc.

[Examples]

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

The characteristic values in the present specification and examples are obtained by the following methods.

(1) Total fineness and single yarn fineness

The sample (strip) was placed in a fabric inspection machine with a frame length of 1.000 m, and the variety of 27 dtex or less was made into 1000 reels, and the varieties below 28 dtex were made into 500 reels, and dried in a hot air dryer at 105 ± 2 ° C for 60 minutes. The value calculated by the following formula (i) or (ii) by the value measured by the balance is taken as the total fineness. The value obtained by dividing the total fineness obtained by the number of single yarns of the sliver is taken as the single yarn fineness.

(i) Varieties below 27dtex:

Total fineness (dtex) = measurement value (g) × (10000/1000) × {1 + (public water rate (%) / 100)}

(i) Varieties below 28dtex:

Total fineness (dtex) = measurement value (g) × (10000/500) × {1 + (common moisture rate (%) / 100)}

Here, in the case of the nylon 6 and nylon 66 polymers used in the examples, the specific moisture content was set to 4.5% to calculate the fineness.

Single yarn denier (dtex) = total fineness (dtex) / single yarn count

However, for the single yarn fineness in the mixed long fiber of the two different types of cross-sectional shapes (section A and section B), the area ratio of the single yarn cross-section in each cross-sectional shape is obtained by the following equation. The total fineness is multiplied by the area ratio and divided by the total number of long fibers of the same shape.

Area ratio of section A = area of section A / (area of section A + area of section B)

Area ratio of section B = area of section B / (area of section A + area of section B)

Single yarn fineness (dtex) of section A in the mixed-fiber long fiber = (total fineness (dtex) × area ratio of section A) / long fiber number of section A

Single yarn fineness (dtex) of section B in the mixed-fiber long fiber = (total fineness (dtex) × area ratio of section B) / long fiber number of section B

(2) Relative viscosity of sulfuric acid

The sample to be weighed was dissolved in 98% by weight of concentrated sulfuric acid to make the sample concentration 1 g/100 ml, and the number of seconds of the drop (T1) at 25 ° C was measured for the solution by an Ostwald viscometer. Further, in the case of concentrated sulfuric acid of 98% by weight of the undissolved sample, the number of falling seconds (T2) at 25 ° C was measured in the same manner, and the relative viscosity (ηr) of the sample was determined by the following formula.

(ηr)=(T1/T2)+{1.891×(1.000-C)}

(3) Average number of fluff

The average number of fluff is determined by the MALITI-POINT FRAY COUNTER MFC-200 (sensor type P type) of Toray Engineering (currently known as tmt Machinery), and the length of the fluff is set (from the center of the optical axis of the sensor to the U- Guide distance at the bottom of the guide: 2.0 mm, yarn speed: 600 m/min, measurement time: 20 minutes, while confirming the yarn tension: 0.25 g/dtex to 0.75 g/dtex, the number of measurements: 10 times The measurement was carried out, and the average value of the measurement was taken as the average number of fluffs (pieces/12,000 m).

(4) Directional parameter ratio

The orientation parameter is determined by Raman spectroscopy for a sample with a circular cross-sectional shape, and T-64000 is manufactured by Jobin Yvon/Ai Rong Property Co., Ltd. in the measurement mode: micro-Raman, objective lens: ×100, light beam Diameter: 1 μm, light source: Ar ⁺ laser / 514.5 nm, laser power: 100 mW, diffraction grating: Single 600, 1800 gr/mm, slit: 100 μm, detector: CCD 1024 × 256 manufactured by Jobin Yvon get on. The measurement sample was sliced by a microtome after being embedded in a resin (bisphenol-based epoxy resin, cured for 24 hours) at a chamfer angle of 5° or less from the fiber length direction. The sliced sample had a thickness of 1.5 μm and was cut through the center of the fiber. The measurement of the orientation is performed under polarized light conditions. When the polarization direction is aligned with the fiber length direction, it is set to be parallel polarized light (∥), and when it is orthogonal to the fiber length direction, it is set to be vertically polarized (⊥), and the Raman bands are respectively obtained ( Raman band) in the vicinity of 1130cm CC classified ^-1 bending vibration mode (bending vibration mode) of the peak intensity (I ₁₁₃₀₎ and 1635cm classified in the vicinity of the peak C ^-1 = O stretching (stretching vibration) of The ratio of the intensity (I ₁₆₃₅ ) was evaluated for the degree of orientation. That is, the orientation parameter = (I ₁₁₃₀ /I ₁₆₃₅ )∥/(I ₁₁₃₀ /I ₁₆₃₅ )⊥

In the measurement point, the orientation parameter of the surface portion of the single yarn is obtained by performing laser scanning from the surface of the single yarn to the point of 1 μm inside and the orientation parameter of the central portion to the center of the single yarn, and calculating the orientation parameter. From this result, the ratio of the orientation parameter of the surface portion of the single yarn to the orientation parameter of the central portion of the single yarn was calculated by the following equation. Further, in terms of the orientation parameter of the central portion of the single yarn and the surface portion of the single yarn, the average value of five arbitrary single yarns in the long fiber was used.

Orientation parameter ratio = (orientation parameter of the surface of the single yarn) / (orientation parameter of the central part of the single yarn)

(5) Uster unevenness

The USTER TESTER UT-4 of ZELLWEGER USTER is used to measure the unevenness of 1/2 inert under the conditions of a yarn speed of 50 m/min, S捻, and a number of turns of 8000 rpm for 3 minutes. Degree U%.

(6) Stress at 15% elongation

The stress at the elongation of 15% was measured by using TENSIRON RPC-1210A manufactured by ORIENTEC Co., Ltd. at a distance of 50 cm between the holders and stretching at a tensile speed of 50 cm/min, and the tension at the time of elongation to 57.5 cm was measured three times. The value obtained by dividing the average value by the fineness of the fiber.

(7) Extension

The elongation was performed by using TENSIRON RPC-1210A manufactured by ORIENTEC Co., Ltd., held at a distance of 50 cm between the holders, and stretched at a tensile speed of 50 cm/min, and the tensile length at the time of the third yarn break was measured, and the average value was divided by 50 cm. Multiply by 100 to get the value.

(8) Softness of fabric

The fabric obtained by the obtained fiber and dyed was judged by the touch and the naked eye to determine the softness, the smoothness of the surface, the drapability, and the depth of the fabric color, and were determined in the following four stages.

(A)...very good (the dyed fabric is soft, smooth and drapable, and no fluff is visible on the fabric surface);

(B)...good (although it is soft and excellent in drape, but the smoothness is not good, and some surfaces are fluffy);

(C)... slightly poor (although drape, softness, smoothness, and fluffing on some surfaces);

(D)... Bad (the fabric is hard and smooth, the drapability is poor, and the surface is fluffing).

(9) The dyeing texture of the fabric

The obtained fiber was made into a flat woven fabric having a transverse woven length of 180 cm, and the fabric was dyed with an acid dye (Mitsui Nylon Black GL). The dyed flat fabric was subjected to inspection in the longitudinal direction by a perspective inspection machine and evaluated by an inspector (10 persons), and relative evaluation was performed on the basis of the following criteria.

(A)... There are no streaks and unevenness.

(B)... The streaks are not obvious, and the amount of unevenness is seen somewhat, but it is the grade that can be used.

(C)... The streaks are not obvious, and it is seen that there is more unevenness in the shade, but it is a grade that cannot be used.

(D)... The stripes are noticeable and there are many uneven shades, which are the levels that cannot be used.

(10) Water absorption of fabrics (Byreck method)

It was measured by JIS L1096 (1999) "Byreck method". The high water absorption obtained by this measurement was evaluated based on the following criteria.

(A)...90mm or more

(B)...65mm or more and less than 90mm

(C)...55mm or more and less than 65mm

(D)...not up to 55mm

(11) Fabric barrier resistance

After the obtained fiber was knitted into a cylindrical shape, the opaque fabric was evaluated for relative resistance according to the following criteria according to the evaluation of the inspector (10).

(A)...very good (no penetration, can be used as a barrier material)

(B)...Good (although there are some penetrating sensations, it can be used as a barrier material)

(C)...can be used (there is no problem in general use)

(D)...bad (very strong penetration, not used as a lining)

(12) Comprehensive evaluation of fabrics

The comprehensive evaluation of the fabric was evaluated according to the following criteria.

(A)... All of the four items of the softness, dyeing texture, water absorption, and barrier properties of the fabric were evaluated as (A) or (B), and those of two or more were (A).

(B)... For all of the four items of softness, dyeing texture, water absorption, and barrier properties of the fabric, (C) was evaluated as one or less, and (D) was not evaluated.

(C)... For all of the four items of the softness, the dyeing texture, the water absorption property, and the anti-reflection property of the fabric, (C) was evaluated as two or more items.

(D) One or more of the four items of softness, dyeing texture, water absorption, and barrier properties of the fabric are evaluated in (D).

Example 1

98% sulfuric acid with a relative viscosity of 2.63 is melted at 285 ° C, and then supplied to the melt spinning nozzle assembly, which is discharged from a nozzle hole having a circular hole of 98 holes, and each single yarn is oriented toward the surface of the spinning nozzle at 0.25 kPa. After the pressure is passed through the vapor ejection zone where the vapor is ejected, on the downstream side of the vapor ejection zone, the externally blown annular cooling of the monomer passing through the cooling air blowing portion having a cooling starting point distance of 30 mm and a vertical length of 300 mm is passed. The apparatus was sprayed into a radial cooling air of 20 ° C at a wind speed of 40 m/min to perform cooling solidification. Then, at a position of 500 mm from the nozzle surface, a disk-shaped guide portion having a single yarn contact with the outer peripheral portion of the disk and an annular narrowing for oil discharge formed along the outer periphery of the guide portion directly above the guide portion are provided. After the oil supply device of the slit is supplied with the gel oil, the second stage of the oil supply is carried out in the bundle-guided oil supply device, and the yarns are gathered into a bundle, and the yarn is obtained at 4000 m/min while being staggered. After stretching at a draw ratio of 1.10 times, it was wrapped at 4,200 m/min under loosening conditions to obtain a nylon 66 fiber having a filament of 40 dtex/98 and a stretch of 45%. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 1. In addition, the nylon 66 in the table is abbreviated as N66.

Example 2

Nylon 6 having a 98% sulfuric acid relative viscosity of 2.63 was melted at 255 ° C, and then supplied to a melt spinning nozzle assembly, and spun in the same manner as in Example 1 to obtain a 40 dtex/98 long-fiber nylon 6 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 1. In addition, the nylon 6 in the table is abbreviated as N6.

Example 3

Spinning was carried out in the same manner as in Example 1 except that a nozzle having a circular hole of 268 holes was used to obtain a 40 dtex/268 long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 1.

Example 4

Spinning was carried out in the same manner as in Example 1 except that a nozzle having a circular hole having 82 holes was used to obtain a 40 dtex/82 long fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 1.

Example 5

The length of the cooling air blowing portion in the blow-type annular cooling device is set to 100 mm in addition to the downstream side of the steam ejection region under the nozzle, and the oil supply position of the annular oil supply device is set at the nozzle. Spinning was carried out in the same manner as in Example 1 except for the next 300 mm to obtain a 40 dtex/98 long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 1.

Example 6

Spinning was carried out in the same manner as in Example 1 except that 98% of sulfuric acid having a relative viscosity of 2.63 was melted at 275 ° C to obtain a 40 dtex/98 long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 1.

Example 7

Spinning was carried out in the same manner as in Example 1 except that a nozzle having a circular hole of 42 holes was used, and the fineness was 17 dtex, and a nylon 66 fiber of 17 dtex/42 long fiber was obtained. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 2.

Example 8

Spinning was carried out in the same manner as in Example 1 except that a nozzle having a circular hole of 680 holes was used, and the fineness was 280 dtex, to obtain 280 dtex/680 long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 2.

Example 9

Spinning was carried out in the same manner as in Example 1 except that a nozzle having a circular hole having 32 holes was used, and the fineness was 15 dtex, to obtain 15 dtex/32 long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 2.

Example 10

Nylon 6 having 98% sulfuric acid relative viscosity of 2.63 was melted at 255 ° C, supplied to the melt spinning nozzle assembly, and spouted from a 98-hole nozzle having a slit shape having a three-leaf shape as shown in FIG. Spinning was carried out in the same manner as in Example 1 except that the hole was discharged, and a 40 dtex/98 long fiber trilobal section nylon 6 fiber was obtained. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 2.

Example 11

Spinning was carried out in the same manner as in Example 10 except that a 49-hole nozzle having a six-leaf nozzle discharge hole and a nozzle having the same number of round holes were used as shown in Fig. 3, and 40 dtex/ was obtained. 98 long-fiber six-leaf section and round section mixed with nylon 6 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 2.

Example 12

Spinning was carried out in the same manner as in Example 1 except that after the interlacing was carried out, it was taken at 3000 m/min, and after stretching at a draw ratio of 1.50 times, and then wound at 4,300 m/min under loosening conditions. , obtained 40dtex/98 long fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 3.

Example 13

Spinning was carried out in the same manner as in Example 1 except that the inner blow type annular cooling device of the cooling wind blowing portion having a length of 300 mm in the vertical direction was replaced by the outer blow type annular cooling device. 40dtex/98 long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 3.

Example 14

Spinning was carried out in the same manner as in Example 1 except that the distance from the cooling starting point was set to 20 mm to obtain a nylon 66 fiber of 40 dtex/98 long fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 3.

Example 15

Spinning was carried out in the same manner as in Example 1 except that the distance from the cooling starting point was set to 40 mm to obtain a nylon 66 fiber of 40 dtex/98 long fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 3.

Example 16

Spinning was carried out in the same manner as in Example 1 except that the distance from the cooling starting point was set to 10 mm to obtain a nylon 66 fiber of 40 dtex/98 long fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 3.

Example 17

Spinning was carried out in the same manner as in Example 1 except that the cooling starting point distance was 60 mm, and 40 dtex/98 long-fiber nylon 66 fiber was obtained. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 4.

Example 18

Spinning was carried out in the same manner as in Example 1 except that the wind speed of the cooling air of 20 ° C which was blown radially from the outer-ring type annular cooling device was 27 m/min, and 40 dtex/98 long-fiber nylon 66 was obtained. fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 4.

Example 19

Spinning was carried out in the same manner as in Example 1 except that the wind speed of the cooling air of 20 ° C which was blown radially from the outer-ring type annular cooling device was 49 m/min, and 40 dtex/98 long-fiber nylon 66 was obtained. fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 4.

Example 20

Spinning was carried out in the same manner as in Example 1 except that the wind speed of the cooling air of 20 ° C which was blown radially from the outer-ring type annular cooling device was 17 m/min, and 40 dtex/98 long-fiber nylon 66 was obtained. fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 4.

Example 21

Spinning was carried out in the same manner as in Example 1 except that the wind speed of the cooling air of 20 ° C which was blown radially from the outer-ring type annular cooling device was 58 m/min, and 40 dtex/98 long-fiber nylon 66 was obtained. fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 4.

Comparative example 1

Spinning was carried out in the same manner as in Example 1 except that it was discharged from a nozzle opening having a circular hole of 160 holes and the fineness was 15 dtex, thereby obtaining a nylon 66 fiber of 15 dtex/160 long fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 5.

Comparative example 2

Spinning was carried out in the same manner as in Example 1 except that the fineness was 56 dtex, and 56 dtex/98 long-fiber nylon 66 fiber was obtained. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 5.

Comparative example 3

A disc-shaped guide portion that does not have an annular slit for oil discharge is used at a position of 500 mm from the nozzle surface below the vertical direction of the outer-ring type annular cooling device, and the single yarn is contacted without supplying the oil agent. Spinning was carried out in the same manner as in Example 1 except for the disk-shaped guide portion to obtain a nylon 66 fiber of 40 dtex/98 long fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 5.

Comparative example 4

In the same manner as in Example 1, except that the polyethylene terephthalate resin was melted at 290 ° C and supplied to the melt spinning nozzle assembly, 40 dtex/98 long fiber polyterephthalic acid was obtained. Ethylene glycol resin fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 5.

Comparative Example 5

A 40 dtex/98 long-fiber nylon 66 fiber was obtained in the same manner as in Example 1 except that the cooling device was a one-way type DC chimney, and the yarn guide was gathered into a bundle and supplied with oil. . The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 5.

Comparative Example 6

After the oil supply was performed in the annular oil supply device, the second stage oil supply was not performed, and the yarn was gathered into the bundle in the bundle guiding portion, and the yarn was spun in the same manner as in Example 1 to obtain 40 dtex/98. Long-fiber nylon 66 fiber. The obtained raw yarn and fabric were evaluated for characteristics. The results are presented in Table 5.

1. . . nozzle

2. . . Nozzle underheating zone

3. . . Outer blown annular cooling device

4. . . Ring oil supply device

5. . . Cluster guiding type oil supply device

6. . . Staggered nozzle

7. . . Pull roller

8. . . Stretch roller

9. . . Winding machine (winding device)

10. . . Fiber long fiber

11. . . Fiber packaging

12. . . Oil discharge spout

13. . . Disc type guide

14. . . Fiber long fiber

15. . . Oil storage tank

16. . . Oil agent spit out through the slit

17. . . Oil supply piping

18. . . Inner blow type annular cooling device

Fig. 1 is a view showing an example of a method for producing a polyamide fine fiber of the present invention.

Fig. 2 is a view showing an example of a nozzle hole shape used in the production of the polyamine fine fiber of the present invention.

Fig. 3 is a view showing another example of the shape of a nozzle hole used in the production of the polyamide fine fiber of the present invention.

Fig. 4 is a view showing an example of a ring-shaped oil supply device which is applied to the production of the polyamine fine fibers of the present invention.

Fig. 5 is a view showing another example of the production method of the polyamine fine fiber of the present invention.

1. . . nozzle

2. . . Nozzle underheating zone

3. . . Outer blown annular cooling device

4. . . Ring oil supply device

5. . . Cluster guiding type oil supply device

6. . . Staggered nozzle

7. . . Pull roller

8. . . Stretch roller

9. . . Winding machine (winding device)

10. . . Fiber long fiber

11. . . Fiber packaging

Claims (11)

A polyamidamide ultrafine fiber characterized in that the polyamine fiber having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less has an average number of fluff per 1.02000 m in the longitudinal direction of the long fiber of 1.0 or less. For example, the polyamidamide ultrafine fiber of the first aspect of the patent application has a Uster unevenness in the longitudinal direction of the long fiber of 1.0% or less. The polyamine fine fiber of the first aspect of the patent application, wherein the total fineness is 15 to 300 dtex, and the long fiber number is 30 or more. The polyamine fine fiber of the second aspect of the patent application, wherein the total fineness is 15 to 300 dtex, and the long fiber number is 30 or more. The polyamine fine fiber according to any one of claims 1 to 4, wherein the long fiber has a profiled cross section. The polyamidamide ultrafine fiber according to any one of claims 1 to 4, wherein in the polyamidamide ultrafine fiber, a single yarn having a long fiber cross-sectional shape and a single circular shape The orientation parameter of the yarn, the ratio of the orientation parameter of the surface portion of the single yarn to the orientation parameter of the central portion of the monofilament is 1.10 or more. A melt spinning method of polyamide fine fibers, which is a melt spinning of polyamide fine fibers having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less and an average number of fluffs of 1.0 or less per 12000 m in the longitudinal direction of the long fibers. A method of spinning a spun yarn from a spinning nozzle having a discharge hole arranged in a circumferential shape from an outer peripheral portion of a spinning nozzle, and using a spout hole located below a center portion of the spinning nozzle Cooling air is blown on the inner side or the outer side of the spun spinning spun yarn to cool the molten spun yarn, and further cooled A disk-shaped guide portion having a single yarn in a peripheral portion of the disk below the vertical direction of the cooling device and a ring-shaped slit for oil discharge formed along the outer periphery of the guide portion directly above the guide portion After the oil supply device performs oil supply, the yarns are gathered into a bundle in the bundle-guided oil supply device, and the oil supply in the second stage is performed. The method for melt spinning a polyamide fine fiber according to the seventh aspect of the patent application, wherein the cooling device is a cooling device that blows cooling air from the inside of the melt spun yarn spouting from the discharge hole to cool the melt spun yarn. . A method of melt spinning a polyamide fine fiber according to claim 7 or 8, wherein the cooling device satisfies the following conditions: (1) a distance from a spinning nozzle face to a cooling start position of the cooling device (L) The wind speed of the cooling air blown at a cooling start position of 10 mm ≦L ≦ 70 mm, (2) is 15 to 60 m/min. A melt spinning device for polyacrylamide ultrafine fibers, which is a melt spinning of polyamide fine fibers having a single yarn fineness of 0.10 dtex or more and 0.50 dtex or less and an average number of fluffs of 1.0 or less per 12000 m in the longitudinal direction of the long fibers. The apparatus has a spinning nozzle having a discharge hole arranged in a circumferential shape from an outer peripheral portion of the spinning nozzle, and a yarn spinning yarn which is disposed below the center portion of the spinning nozzle and which is discharged from the discharge hole Or a cooling device that blows the cooling air on the outside to cool the melt-spun gauze, and further has a disk-shaped guide portion that contacts the single yarn at the outer peripheral portion of the disk in the vertical direction of the cooling device, and a guide portion at the guide portion An annular oil supply device for an annular slit for oil discharge formed along the outer circumference of the guide portion; and for causing the sliver to gather downstream The bundling guide type oil supply device that bundles and performs the second stage of oil supply. The melt spinning device of the polyamide fine fiber according to claim 10, wherein the cooling device is a cooling device that blows cooling air from the inside of the melt spun yarn spouted from the discharge hole to cool the melt spun yarn. .