TWI522504B - Abrasion resistant polyester fiber, its manufacturing method and abrasion resistant knitted fabric - Google Patents

Description

Abrasion resistant polyester fiber, its manufacturing method and wear resistant braid

The present invention relates to a polyester fiber having good abrasion resistance and a braid containing the fiber.

Polyester fibers represented by polyethylene terephthalate (hereinafter referred to as PET (polyethylene terephthalate)) are excellent in mechanical properties and workability, and therefore are used for a wide range of applications in clothing or fabrics. Extensive research has been conducted to develop fibers and articles that meet the required characteristics for various applications.

In the fabric or cloth composed of the woven fabric containing the polyester fiber, abrasion resistance is one of the important required characteristics, and therefore a knitted fabric excellent in abrasion resistance is sought.

When the polyester fiber is mainly used for the clothing in the shape of a woven fabric, especially when it is a windbreaker, a down jacket, or the like, there is a rubbing of the crotch or the thigh due to wearing. And the situation of fluffing or breakage. In addition, especially when used in outdoor clothing (climbing for outdoor activities such as mountaineering and camping), there is friction with other objects (for example, friction with a rucksack or rope, or rubbing against the ground or cliffs, grass, etc.) ) and the situation of fluffing or breakage.

When the polyester fiber is mainly used in the shape of a knitted fabric for clothing, especially sportswear such as sports tops or shorts, there is a strong friction between the fabrics or other objects (for example, the players are in contact with each other or with the game articles, or occur due to sliding. In the case of contact with the ground, etc., which is caused by fluff or breakage.

In general, from the viewpoint of abrasion, polyester fibers are known to be slightly inferior to polyamide fibers such as nylon 66, but polyamide fibers are liable to cause photodegradation or yellowing, and are not suitable for use in harsh outdoor environments. Therefore, various studies are being conducted on polyester fibers to improve their abrasion resistance.

Since the prior art, a method of increasing the stretching ratio to obtain a high-strength polyester has been known. Further, Patent Document 1 below discloses a method of obtaining a high-strength polyester fiber by vigorously studying an elongation method in the production of a polyester fiber. The yarn obtained by the above-described production method has a high strength in the fiber axis direction, but has a weaker bearing force in other directions from the direction orthogonal to the fiber axis, and abrasion of the material for the clothing material is generated from all directions. In the case of wear, sufficient wear resistance cannot be obtained.

In the following Patent Document 2, a crimped yarn excellent in abrasion resistance for a garment having a flat cross section and having an improved internal viscosity and strength is proposed. The crimping yarn is formed into a structure in which the strength and the alignment are improved in consideration of the use of the clothing, but the direction other than the fiber axis is still brittle, and the durability against wear from all directions is not sufficient.

Various methods for improving the wear resistance by adding an additive or the like to the polymer have also been proposed. For example, in Patent Document 3 below, a fiber containing a specific cerium oxide particle and having a specific crystal structure to improve alignment is proposed.

However, if particles are contained, the strength of the yarn usually decreases. Moreover, due to the improved alignment structure, the direction other than the fiber axis is still brittle, and the wearability in all directions such as Martindale abrasion is not sufficient.

In the following Patent Document 4, a method is proposed in which a single yarn breakage and raising are caused by suppressing the interlaced yarns for the warp yarns of the fabric by the yarns and the metal portions of the loom, and after the polyester unstretched yarns are stretched, A relaxation heat treatment of 0.2 to 5% and fluid entanglement treatment are carried out, thereby improving the wearability.

However, although this method can suppress the single yarn breakage and fuzzing caused by the yarns and the friction with the loom parts when manufacturing the fabric to some extent, it is difficult to prevent the clothing, especially the wind jacket, the down jacket and the like, the sports top. In the case of sportswear such as shorts or outdoor clothing (outdoor sports for mountaineering, camping, etc.), the fabric is damaged by friction with each other and other objects.

In particular, in recent years, the demand for the thinness of the woven fabric has been increasing from the viewpoint of the wearing comfort of the fabric (the weight of the fabric per unit area is small). In order to make the texture of the woven fabric thin, it is only necessary to use a fiber having a fine fineness, but the finer the fineness of the fiber to be used, the lower the abrasion resistance of the woven fabric. Therefore, in recent years, the demand for enhancing the abrasion resistance of fine-denier fibers has been further increased.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 4-245918

[Patent Document 2] Japanese Patent Laid-Open Publication No. SHO 63-309638

[Patent Document 3] Japanese Patent No. 3277703

[Patent Document 4] Japanese Patent Laid-Open Publication No. SHO 58-18431

The object of the present invention is to provide a specific elongation range on the strength, elongation and stress-strain curves for improving the abrasion resistance of fabrics, especially those using fine-denier polyester fibers. The physical properties of the polyester fiber such as the Young's modulus are specified to be abrasion resistant polyester fibers within a specific range.

The problem to be solved by the present invention is also to provide a woven fabric comprising the above-mentioned polyester fiber, which is not easily rubbed by the crotch or the thigh when used as a clothing material, especially a wind jacket, a down jacket, or the like. However, when fluffing or breakage, especially when used as sportswear or outdoor clothing, it is not easy to fluff or break under the rubbing of the fabrics or other objects, and the hand feels good.

The present inventors have intensively studied and repeated experiments to solve the above problems, and as a result, found that for polyester fibers, physical properties of polyester fibers, particularly strength, elongation, and stress, can be obtained by performing a specific range of relaxation heat treatment after stretching treatment. - The differential Young's modulus on the strain curve is specified within a specific range, so that a polyester fiber having improved wear resistance can be obtained. The present inventors have found that a woven fabric or a knitted fabric (hereinafter collectively referred to as "knitted fabric") containing such a polyester fiber having improved abrasion resistance is particularly effective for preventing breakage caused by strong contact with other objects.

That is, the present invention is as follows.

[1] A polyester fiber characterized in that it is an abrasion-resistant polyester fiber having ethylene terephthalate as a repeating unit of 95 mol% or more, and satisfies the following requirements (1)~ (5):

(1) The fineness is 8 dtex or more and 200 dtex or less;

(2) The single yarn fineness is 1.0 dtex or more and 4.0 dtex or less;

(3) The breaking strength is 3.5 cN/dtex or more;

(4) The elongation at break is 20% or more and 50% or less;

(5) The minimum differential Young's modulus of the region on the stress-strain curve of the fiber of 2% or more and 5% or less is 20 cN/dtex or less.

[2] The polyester fiber according to [1] above, which further satisfies the following requirements (6):

(6) The yarn abrasion strength is 0.5 times/dtex or more.

[3] The polyester fiber according to [1] above, which further satisfies the following requirements (7):

(7) The ultimate viscosity is 0.70 dl/g or more and 1.30 dl/g or less.

[4] The polyester fiber according to any one of [1] to [3] above which further satisfies the following requirement (8):

(8) The crystallinity is 60% to 90%, and the degree of alignment is 0.70 to 0.92.

[5] An abrasion-resistant fabric comprising the polyester fiber according to any one of [1] to [4] above.

[6] The abrasion resistant fabric according to [5] above, which is a fabric having a weight reduction rate of 5% or less under 30,000 times in the Martindale abrasion test.

[7] The abrasion resistant fabric of the above [5] or [6], wherein the woven fabric is a woven taffeta fabric.

[8] An abrasion resistant knitted fabric comprising the polyester fiber according to any one of [1] to [4] above.

[9] The abrasion resistant knitted fabric according to the above [8], which has a basis weight of 80 to 350 g/m ² .

[10] The method for producing an abrasion resistant polyester fiber according to any one of the above [1] to [4], which comprises the step of setting the ultimate viscosity to 0.70 dl/g or more and 1.30 dl/g or less. The polyester is melt-spun; the elongation treatment is performed at a stretching ratio of 65% or more and 85% or less of the ultimate stretching ratio; and then, at a heat treatment temperature of 120 ° C or more and 220 ° C or less, 5% or more and 15% or less. The relaxation rate is subjected to a relaxation heat treatment.

[11] The method for producing an abrasion-resistant polyester fiber according to [10] above, wherein the stretching is temporarily performed after the stretching treatment, and then the relaxation heat treatment is performed.

[12] The method for producing an abrasion-resistant polyester fiber according to [10] above, wherein after the relay stretching treatment, the relaxation heat treatment is performed without temporarily winding up.

[13] The method for producing an abrasion resistant fabric according to any one of the above [5] to [7] wherein, in the dyeing processing step, a relaxation heat treatment is performed at the time of setting.

[14] The method for producing an abrasion resistant fabric according to [13] above, wherein the fabric containing the polyester fiber subjected to false twist processing at 180 to 200 ° C is subjected to a relaxation heat treatment at a temperature higher than a false twist temperature.

[15] The method for producing an abrasion resistant fabric according to [8] or [9] above, wherein in the dyeing processing step, the relaxation heat treatment is performed at the time of setting.

[16] The method for producing an abrasion resistant fabric according to the above [15], wherein the knitted fabric comprising the polyester fiber subjected to false twist processing at 180 to 200 ° C is subjected to a relaxation heat treatment at a temperature higher than a false twist temperature.

According to the present invention, it is possible to obtain a polyester fiber which is excellent in abrasion resistance, particularly suitable for a thin woven fabric, and a woven fabric containing the same. The woven fabric of the fiber is used for clothing, especially when it is made into a windbreaker, a down jacket, and the like, and is not easily fluffed or broken due to rubbing of the crotch or the thigh, especially in the case of making an outdoor garment. When worn, it is highly resistant to the strong contact friction of the clothing materials with each other or with other objects, and is a clothing material with a good hand feeling. Moreover, the fabric which is required to have abrasion resistance can be made lighter and thinner.

Moreover, if the polyester fiber of the present invention is used for knitting, it is possible to provide a hair garment that is not easily rubbed by the rubbing of the crotch or the thigh when wearing a sports top or a sports short, a sportswear such as a jersey. It is also difficult to produce clothing that is fluffed or damaged when it is rubbed on the floor or on the floor during competition or training. It can also provide a fabric that is excellent in suppressing the effect of the hook. Moreover, the fabric which is required to have abrasion resistance can be made lighter and thinner.

Hereinafter, the present invention will be described in detail.

In the present invention, the term "wear resistance" refers to the property of the fiber surface against friction (shearing force) when rubbed against the surface of other objects. In general, fibers are caused by rubbing to cause a phenomenon in which fibrils in a single yarn are exposed to the surface of a single yarn (fibrillation). In general, when fibrillation occurs, the surface of the fabric is reduced in creativity, durability, and the like, and fibrillation is a problem. Therefore, in order to improve the wear resistance, how to prevent fibrillation becomes the main point.

The polyester fiber extended under normal conditions has a high degree of crystallinity, and the molecule exhibits a higher alignment state in the fiber length direction, and the polyester fiber of the present invention is subjected to a specific range of relaxation heat treatment, for example, after the elongation treatment. The orientation of the polyester molecules in the fibers is disturbed to form a decrease in the degree of alignment (hereinafter also referred to as alignment relaxation), and the physical properties of the polyester fibers, particularly the strength, elongation and stress-strain curve (SS curve) A polyester fiber having a differential Young's modulus in a specific range.

Fig. 1 shows a representative stress-strain curve (S-S curve) of the polyester fiber of the present invention. As shown in Fig. 1, the polyester fiber of the present invention has a characteristic curve having a flat portion in a low elongation region and an increase in the Young's modulus.

Fig. 2 is a graph showing the differential Young's modulus-strain curve obtained by differentiating the elongation of Fig. 1. As shown in Fig. 2, the polyester fiber of the present invention has a minimum value in the range of elongation of 2 to 5%, and has a maximum value in the range of elongation of 10 to 15%. Specifically, as shown in FIG. 2, the yarn obtained in the present invention has a minimum value of 20 cN/dtex or less at an elongation of 2% or more and 5% or less, and an elongation of 10 to 15%. Within the range, it is above 23 cN/dtex as the maximum value.

It is considered that when the polyester fiber of the present invention having the above-described differential Young's modulus function by the alignment relaxation exerts a frictional force (shearing force) on the surface of the fiber, the energy generated by the frictional force (shearing force) is determined by the polyester. The alignment of the molecules is increased in a large amount, so that fibrillation is less likely to occur.

The polyester used in the polyester fiber of the present invention contains ethylene terephthalate as a main repeating unit, and is 95 mol% or more, preferably 97 mol% or more, more preferably 99 mol%. The above contains ethylene terephthalate as a repeating unit. 100 mol% of ethylene terephthalate may be used as a repeating unit, and may also contain less than 5 mol% of other ester repeating units. That is, the polymer used in the polyester fiber of the present invention may be a PET single structure or a copolymerized PET having a repeating unit of less than 5 mol% of other esters.

Typical examples of the copolymerization component include the following.

Examples of the acidic component include an aromatic dicarboxylic acid represented by isophthalic acid and sodium isophthalate-5-sulfonate, and an aliphatic dicarboxylic acid represented by adipic acid and itaconic acid. Examples of the diol component include ethylene glycol, butylene glycol, and polyethylene glycol.

Further, a hydroxycarboxylic acid such as hydroxybenzoic acid may also be mentioned. It is also possible to copolymerize a plurality of these.

Further, in the polyester fiber of the present invention, a matting agent such as titanium oxide, a heat stabilizer, an antioxidant, an antistatic agent, an ultraviolet absorber, an antibacterial agent, various pigments, etc. may be contained in a range that does not impair the effects of the present invention. The additive may also contain these components by copolymerization.

The polyester fiber of the present invention has a fineness of 8 dtex or more and 200 dtex or less, and when used for a woven fabric, it is preferably 8 dtex or more and 100 dtex or less. Further preferably, the range is 10 dtex or more and 84 dtex or less. If it is less than 8 dtex, the fineness is too fine, so the operation of the fiber in the weaving step becomes difficult. If it exceeds 100 dtex, the thickness of the thin fabric for clothing is thick, and the hand feel is not good. In particular, the effects of the present invention are also effective for fine denier, and particularly excellent abrasion resistance in a spun yarn of 10 to 30 dtex. Therefore, a lightweight, thin fabric using these fine-denier yarns, particularly a fabric having a basis weight of 40 g/m ² or less, can exhibit excellent wear resistance.

On the other hand, in the case of being used for knitting, the fineness of the polyester fiber of the present invention is preferably from 20 dtex to 200 dtex. A better range is 30 dtex to 175 dtex. If it is less than 20 dtex, the fineness is too fine, so breakage is likely to occur during the preparation, and the wear resistance is poor. On the other hand, if it exceeds 200 dtex, the yarn becomes hard and the texture of the knitted fabric is not good. The abrasion resistance effect exerted by the polyester fiber of the present invention is also effective for fineness, and particularly excellent abrasion resistance in a fine yarn of 30 to 84 dtex. As a result, lightweight, thin braids using these yarns, for example, knitted fabrics having a basis weight of 120 g/m ² or less, also have excellent wear resistance.

The single yarn fineness of the polyester fiber of the present invention is 1.0 dtex or more and 4.0 dtex or less, preferably 1.0 dtex or more and 3.1 dtex or less. When the single yarn fineness is less than 1.0 dtex, the wear resistance is not good. On the other hand, if the single yarn fineness exceeds 4 dtex, the abrasion resistance becomes good, but the fiber becomes hard, so the texture feels. Poor, it is also easy to irritate the skin.

The polyester fiber of the present invention has a breaking strength of 3.5 cN/dtex or more, preferably 4.0 cN/dtex or more, more preferably 4.5 cN/dtex or more. If the breaking strength is less than 3.5 cN/dtex, the wear resistance is poor. The larger the breaking strength coefficient, the better the value of the property for improving the abrasion resistance. However, if it is 6.0 cN/dtex or more, the fiber becomes hard, which is not preferable in terms of abrasion resistance.

The elongation at break is 20% or more and 50% or less, preferably 30% or more and 45% or less. If the elongation at break is less than 20%, the degree of alignment of the polyester molecules in the fiber is increased, so that fibrillation is likely to occur, and good abrasion resistance cannot be obtained. On the other hand, if the elongation at break exceeds 50%, It is difficult to achieve a breaking strength of 3.5 cN/dtex or more, and thus the object of the present invention cannot be achieved.

In the present invention, the minimum differential Young's modulus of the region on the stress-strain curve of the fiber of 2% or more and 5% or less is 20 cN/dtex or less, preferably 2 to 15 cN/dtex, more preferably 4~10 cN/dtex. When it exceeds 20 cN/dtex, the alignment of the polyester molecules in the fiber obtained by the relaxation heat treatment is insufficient, and fibrillation occurs due to the frictional force (shearing force), so that the abrasion resistance is unsatisfactory.

The polyester fiber of the present invention preferably has a yarn abrasion strength of 0.5 times/dtex or more in the yarn abrasion test. More preferably, the yarn wear strength is 0.6 to 2.0 times/dtex. The yarn abrasion strength can be evaluated using the yarn abrasion tester shown in Fig. 10. The yarn was cut into 20 cm, and the several yarns were aligned in such a manner that the total fineness was about 167 dtex, and the twist was performed about 10 times/m. A load of 0.14 g/dtex was applied to a metal rod having a diameter of 1 cm to which the #800 abrasive paper was attached, and brought into contact with the yarn. The metal bar was rubbed at a speed of 0.6 times/second and an amplitude of 3 cm, and the number of times until the yarn was broken (one round trip was made once) was taken as the number of yarn abrasions. The rubbing paper was rubbed 10 times in such a manner that the state of the abrasive paper was not changed, and the abrasive paper was moved once after each rubbing 10 times to rub the abrasive paper in a new state. The yarn wear strength is determined by the following formula (3):

Yarn wear strength = number of yarn wear / total fineness of yarn used for testing (3)

And calculated.

When the polyester fiber of the present invention is used for a woven fabric, it may be in an untwisted state, or may be entangled or twisted to improve the bundling property.

Next, a method of producing the polyester fiber of the present invention will be described.

The ultimate viscosity of the polyester fiber used in the present invention is preferably in the range of 0.70 dl/g or more and 1.30 dl/g or less, more preferably 0.75 dl/g or more and 1.10 dl/g or less. If the ultimate viscosity is 0.70 dl/g or more, the abrasion resistance of the obtained fiber can be improved. In addition, when the ultimate viscosity exceeds 1.30 dl/g, the abrasion resistance is good, but the hand feel is hard, and it is not preferable as a fiber for a knitted fabric for clothing.

In the production of the polyester fiber of the present invention, it is important that the unstretched yarn is stretched at a limit stretching ratio of 65% or more and 85% or less, preferably 70% or more and 80% or less, and then subjected to a relaxation heat treatment. When the elongation at break of the unstretched yarn is (E), the ultimate stretch ratio (MD) of the undrawn yarn is expressed by MD = (E + 100) / 100. When the elongation is not achieved at a stretching ratio of 65% of the ultimate stretching ratio, it is difficult to achieve a breaking strength of 3.5 cN/dtex or more, and the object of the present invention cannot be attained. In the case of stretching at a stretching ratio exceeding 85% of the ultimate stretching ratio, breakage is frequently generated during the relaxation heat treatment.

The present invention is characterized in that a relaxation heat treatment is performed in any of the steps of the fiber and the braid manufacturing step at the time of spinning, after spinning, and processing of the knitted fabric. By relaxation heat treatment, crystallinity can be improved and the degree of alignment can be suppressed. When the relaxation heat treatment is performed in the state of spinning the fiber or in the state of the yarn after the spinning, the heat treatment temperature is preferably in the range of 120 ° C or more and 220 ° C or less, more preferably 150 ° C or more and 200 ° C or less. If the temperature is less than 120 ° C, the alignment effect of the polyester itself is low. Therefore, even if the relaxation heat treatment is combined, the effect of the coordination of the polyester molecules in the fibers is insufficient, and good abrasion resistance cannot be obtained. If it exceeds 220 ° C, the melting point of the polyester is approached, so that it is easy to cause fuzzing or breakage due to heat treatment.

The relaxation rate in the relaxation heat treatment in the yarn state of the present invention is preferably 5% or more and 15% or less, more preferably 7% or more and 12% or less. The relaxation rate is the speed (Vk) of the supply roller 14 in Fig. 8 and the speed (Vr) of the slack roller 16, or the speed (V ₂ ) of the second roller 11 in Fig. 9 and the speed of the third roller 20 (V). ₃ ), obtained by the relaxation rate = ((Vk - Vr) / Vk) × 100, or ((V ₂ - V ₃ ) / V ₂ ) × 100. When the relaxation heat treatment is performed using an apparatus other than the apparatus shown in Figs. 8 and 9, the relaxation rate can be similarly obtained by the ratio of the yarn speed before and after the heat treatment (usually expressed by the roll speed).

If the relaxation rate is less than 5%, the effect of the coordination of the polyester molecules in the fibers is insufficient, and good abrasion resistance cannot be obtained. On the other hand, if the relaxation rate exceeds 15%, the step tension during the relaxation heat treatment is lowered. , the spinning property is not good.

In this way, by stretching, the relaxation heat treatment is performed to relax the heat shrinkage and alignment of the polyester molecules in the fiber, and the minimum differential Young's modulus of the region having an elongation of 2% or more and 5% or less can be obtained as 20 cN/dtex. Hereinafter, the fiber having improved abrasion resistance. Regarding the relaxation heat treatment, the fiber which is extended and temporarily wound by the spinning device shown in FIG. 7 may be used by the apparatus shown in FIG. 8, or may be temporarily not taken up after being extended as shown in FIG. Heat treatment is performed. In the relaxation heat treatment, the yarn tension is lowered, and from the viewpoint of stably performing the relaxation heat treatment under low tension, it is preferable to carry out the stretching and temporarily take-up, and as shown in Fig. 8, the yarn is moved from top to bottom by gravity. The way to pull the yarn.

Further, it is also possible to use a relaxation heat treatment of the fibers in the woven fabric by selecting a condition for making the size of the woven fabric small in the dyeing and heat setting steps after the woven fabric is produced.

When the woven fabric is subjected to a relaxation heat treatment, the processing step of the woven fabric is usually performed after scouring for intermediate shaping, and then subjected to a final step after the dyeing step, and it is particularly effective to carry out the shaping, especially for intermediate sizing. In the case of a relatively high temperature of 170 ° C to 210 ° C by the shrinkage or longitudinal treatment to relax. The term "shrinking" refers to a process of shortening the size of the width direction of the knitted fabric, and the term "longitudinal" refers to a process of shortening the size of the knitted fabric in the longitudinal direction. The cumulative value of the dimensional reduction rate by the necking and the contraction is preferably 2 to 15%, more preferably 5 to 12%, with respect to the size before the treatment. When it is this range, the polyester fiber in a braid can be processed similarly to the relaxation process corresponding to the relaxation rate of 5-15 % in a yarn state. As an example, when the relaxation heat treatment is performed at a reduction ratio of 5% and a longitudinal reduction ratio of 3%, the integrated value after the treatment is set to 1 (1 - 0.05) × (1 - 0.03). = 0.9215, the cumulative value of the dimensional change rate is 7.85%. The heat treatment time is preferably from 15 seconds to 120 seconds, and particularly preferably from 30 seconds to 100 seconds. Further, it is preferable to set as much as possible in the final setting so as not to make the polyester fiber tight and to flatten the wrinkles. In the case where the above-described relaxation heat treatment is performed in the yarn state, it is also important that heat is applied in a tight state at a temperature higher than the relaxation heat treatment temperature during the processing of the knitted fabric. By the thermal relaxation treatment in the state of the yarn or the woven fabric, the crystallinity of the polyester-based fiber can be improved and the alignment can be lowered, and a fabric excellent in abrasion resistance can be obtained.

The polyester fiber of the present invention preferably has a crystallinity of 60% to 90% and an orientation of 0.70 to 0.92.

The term "crystallinity" as used in the present invention means a wide-angle X-ray measurement of a polyester-based fiber. In a scattering intensity diagram of 5° ≦ 2θ ≦ 40°, a baseline is made at 2θ=5° and 40°, which is regarded as amorphous. When the intensity of θ=19.5° of the peak of the part is A, and the intensity of θ=25.5 which is the peak of the crystal part is B, the following formula (1) is used:

B/(A+B)×100 (1)

And calculate the value (%).

In the present invention, the degree of alignment refers to a transmission type wide-angle X-ray measurement of a polyester fiber, and the azimuth dependence I ( Φ ) of the diffraction intensity from the (100) plane of the polyester is obtained. The intensity and the back ground level, and find the peak width of the I ( Φ ) intensity (peak intensity - background) / 2+ background (the full amplitude of the peak of the peak), by The following formula (2):

f=1-Δ/360 (2)

In the formula, the value calculated by Δ:I( Φ ) is the total value (deg) of the full-width half-peak value (FWHM) of the peak seen in the peak. Further, when calculating I( Φ ), it is necessary to integrate the diffraction intensity in the range of 24<2θ<28°, and perform necessary correction such as correction of an empty cell. From the above formula (2), it is clear that f=1 in the case where the crystal is completely aligned, and f=0 in the case of unaligned.

When the degree of crystallinity is less than 60%, crystallization proceeds insufficiently, and the abrasion strength is lowered. Moreover, in the case of more than 90%, the hand feels hard and is therefore unsatisfactory.

When the degree of alignment is 0.70 or more, excellent wear resistance can be exhibited. However, if the degree of alignment exceeds 0.92, the alignment is strong, so that it is strong in the fiber axis direction, and is effective for improving the strength of the fiber, but on the fiber axis. The opposite direction is weakened, which is not preferable for the abrasion resistance in the present invention. The abrasion resistance in the present invention means that the abrasion resistance from all directions which occurs when the clothes are worn or the like is excellent, and the abrasion resistance in all directions is required. If there is a weaker direction, it will start to wear out from then on, so it is not good.

The range of the above crystallinity and the degree of orientation is particularly different depending on the presence or absence of the false twist processing. The crystallinity of the polyester fiber which has not been processed by false twisting is particularly preferably 65 to 80%, and the orientation is particularly preferably 0.70 to 0.88. The crystallinity of the polyester fiber processed by false twisting is particularly preferably 60 to 90%, and the orientation is particularly preferably 0.85 to 0.92.

In the case of performing false twist processing on the polyester fiber which has been subjected to the relaxation heat treatment, it is preferable to perform false twisting at a low temperature of 180 to 200 ° C, and perform relaxation heat treatment at a temperature higher than the false twist temperature. Further, in the case of performing a relaxation heat treatment on a knitted fabric containing a false twisted polyester fiber, it is also preferable to perform false twist processing at a low temperature of 180 ° C to 200 ° C. Usually, in the case of false twisting, heat of 200 ° C to 210 ° C is applied, and the yarn is treated under tension. In this case, since the setting temperature in the post-processing is usually lower than the false-twisting temperature, it is difficult to sufficiently exert the slack effect at the time of setting. By performing the false heat treatment at a relatively low temperature of 180 to 200 ° C and performing relaxation heat treatment at a temperature higher than the false twist temperature, the crystallinity can be improved, the alignment can be suppressed, and fibers and a braid having excellent abrasion resistance can be formed. The false twist can be either one of the heaters (1H) or two heaters (2H), and the interlacing can be performed before or after the false twist. In the case of 2H false twist, as long as the heater temperature at a higher temperature satisfies the above conditions. In the false twisting process, tension is usually applied under conditions of very high temperature, so that crystallization is performed and the alignment becomes high. However, in the present invention, even if it is used by controlling the temperature and relaxation rate of the false twisting and relaxation heat treatment, The woven fabric of false crepe can also have a crystallinity of 60-90% and an orientation of 0.85-0.92.

The cross-sectional shape of the single yarn of the polyester fiber of the present invention may be a circular shape, a Y-shaped or W-shaped profile, a hollow cross section or the like, and is not particularly limited.

The polyester fiber of the present invention may be used alone or in combination with other fibers. As the other fibers to be composited, for example, other polyester fibers, nylon, acrylic acid, cuprammonium fibers, hydrazine, polyurethane elastic fibers and the like may be selected, but are not limited thereto. The woven fabric composed only of the polyester fiber of the present invention may be used. However, if it is a woven fabric, at least one of the warp yarn and the weft yarn may contain the polyester fiber of the present invention, preferably 30% of the yarn constituting the warp and the weft yarn. The above is the polyester fiber of the present invention. More preferably, it is 50% or more, and particularly preferably 90% or more. In the case of a knitted fabric, at least one part or all of the fibers disposed on at least one side surface, preferably 50% or more, and particularly preferably 90% or more, may be the polyester fiber of the present invention.

The woven fabric of the present invention can be scoured, dyed, and finished by a conventional method, and the kind of the finishing agent can be appropriately selected depending on the use of the polyester fiber to be used. Among them, as described above, treatment at a temperature higher than the treatment temperature in the heat relaxation step in a tight state may impair the thermal relaxation effect, and thus is not preferable. Further, calendering also has an effect of improving crystallinity, which is very preferable.

In general, when various functions are imparted to the knitted fabric by post-processing, there is a problem that the function is lowered by repeated wearing and washing, but the function of the knitted fabric of the present invention which is imparted by the above various processes is repeatedly worn and washed. Sustainability is still excellent. In particular, when the fabric of the present invention is subjected to water repellent processing, it has an effect of excellent durability of the water repellent effect.

When the polyester fiber of the present invention is used as a fabric, the woven fabric can be applied with plain weave, twill weave, satin weave, and various kinds of varying tissues derived therefrom, taffeta fabric, especially gram taffeta. The tarpaulin structure is particularly excellent in abrasion resistance by the abrasion endurance effect of the plaid portion.

The knitted fabric in the case where the polyester fiber of the present invention is used as a knitted fabric may be either a circular knitting or a warp knitting. In particular, the effect of improving the hook is also seen in a knitted fabric such as yondan smooth which is prone to occurrence of hooking, so that it can be preferably used.

Preferably, the fabric of the present invention has a weight reduction rate of 5% or less at 30,000 times in the Martindale abrasion test. More preferably, the weight reduction rate is 3% or less at 30,000 times, and further preferably the weight reduction rate is 1% or less at 30,000 times. Investigating the abrasion condition of the fabric for clothing used in actual wear, the result is very close to the damage state when the abrasion is evaluated by the Martindale method. Therefore, in order to improve the wear resistance at the time of wearing, it is effective to improve the abrasion of Martindale. strength.

Preferably, the knitted fabric of the present invention has an abrasion resistance of N (none) or L (low) in the ART abrasion test. The wear condition of the clothing material for actual wear can be evaluated by the ART abrasion test, and in order to improve the wear resistance at the time of wearing, it is effective to improve the abrasion resistance in the ART abrasion test.

The knitted fabric of the present invention is excellent in hand and abrasion resistance, and can be applied to various fields for clothing. It is especially suitable for windbreakers, down jackets, sportswear, outdoor clothing and other outerwear that are often rubbed against each other when worn. Among them, it is especially suitable for sportswear and outdoor clothing that are worn in harsh environments and often in contact with others. Further, since the knitted fabric of the present invention is characterized by being thin and lightweight, and having excellent abrasion resistance, it is particularly suitable for a thin and light weight of the above-mentioned fabric.

The fabric of the present invention preferably has a basis weight of from 20 to 80 g/m ² . If the basis weight is within this range, a fabric which maintains the fabric properties required for the use of the fabric and which is excellent in abrasion resistance can be obtained. In the present invention, especially a fabric using a fine-denier polyester fiber of 10 to 33 dtex also has excellent abrasion resistance. As a result, a lightweight, thin fabric using these yarns, for example, a fabric having a basis weight of 44 g/m ² or less also has excellent abrasion resistance, so that it can be simultaneously thinned, lightweight, and resistant. Increased wear.

The knitted fabric of the present invention preferably has a basis weight of from 80 to 350 g/m ² . When the basis weight is within this range, it is possible to obtain a knitted fabric which is excellent in abrasion resistance and which is required for the use of the clothing. In the present invention, in particular, the use of a fine-denier polyester fiber of 30 to 84 dtex also has excellent wear resistance. As a result, a lightweight and thin knitted fabric using these yarns, for example, a knitted fabric having a basis weight of 120 g/m ² or less also has excellent wear resistance, so that it can be simultaneously thinned, lightened and resistant. Increased wear.

[Examples]

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited by the examples.

Further, the measurement methods and evaluation methods used are as follows.

(1) Fineness, breaking strength, elongation at break

The measurement was carried out under the following conditions in accordance with JIS-L-1013 (Chemical Fiber Filament Yarn Test Method). The single yarn fineness is calculated by dividing the fineness of the yarn by the number of filaments.

Test piece length: 200 mm

Stretching speed: 200 mm/min

Number of measurements: 5 times / sample

(2) Minimum differential Yang modulus

The breaking strength was measured in the same manner as in the above (1). Using the measured value of stress-elongation per 0.25 sec, the stress at each point is differentiated by elongation to obtain a differential Young's modulus, and the elongation is 2% or more and 5% or less based on the obtained differential Young's modulus curve. The minimum value of the differential Young's modulus is taken as the minimum differential Yang modular.

(3) Ultimate viscosity

The sample polymer was dissolved in o-chlorophenol (hereinafter referred to as OCP), and the relative viscosity ηr of the complex point was determined by using an Oswald viscometer at 25 ° C, and it was extrapolated to infinity dilution. Determine the ultimate viscosity.

(4) Limit extension ratio

The unstretched yarn was taken just before reaching the first roll (10) in Fig. 7 or Fig. 9, and the ultimate stretch ratio was calculated in accordance with JIS-L-1013 (Chemical fiber filament yarn test method). When the elongation at break of the unstretched yarn is set to (E), the ultimate stretch ratio (MD) of the undrawn yarn is expressed by MD = (E + 100) / 100.

(5) Spinning properties

The evaluation of the spinning property was judged as "○" when the yarn breakage rate was 5% or less at the time of spinning on the third day, and "x" was determined when the yarn breakage was 5% or more.

(6) Yarn wearability

Evaluation was carried out using a yarn abrasion tester shown in Fig. 10 . The yarn was cut into 20 cm, and the number of the yarns was aligned so that the total fineness was about 167 dtex, and the twist was performed about 10 times/m. A load of 0.14 g/dtex was applied to a metal rod having a diameter of 1 cm to which the #800 abrasive paper was attached, and brought into contact with the yarn. The metal bar was rubbed at a speed of 0.6 times/second and an amplitude of 3 cm, and the number of times until the yarn was broken (one round trip was made once) was taken as the number of yarn abrasions. The rubbing paper was rubbed 10 times in such a manner that the state of the abrasive paper was not changed, and the abrasive paper was moved once after each rubbing 10 times to rub the abrasive paper in a new state. The yarn wear strength is determined by the following formula (3):

Yarn wear strength = number of yarn wear / total fineness of yarn used for testing (3)

And calculated.

(7) Martindale wearability

The abrasion resistance of the fabric was evaluated in accordance with JIS-L-1096 using a Martindale abrasion tester. The number of rubbing times was set to 20,000 times, and the weight reduction rate after rubbing was divided into five levels according to the standard. The weight reduction rate (%) = {(original cloth weight - weight after rubbing) / (original cloth weight)} × 100, and when the weight reduction rate is 4% or more, it is evaluated as three or less, and is 2% or more and not Up to 4% is rated as Level 4, and if it is less than 2%, it is rated as Level 5.

(8) ART wearability

The fabric was subjected to an abrasion test in accordance with JIS L1076 (ART method). The number of abrasions was set to 60 times, and evaluation was performed with N (none), L (low), M (medium), and H (high).

(9) feel

Regarding the feeling, 9 out of 10 skilled inspectors were judged to be good as "○", and the other cases were evaluated as "X". All of 10 persons were judged to be particularly soft and the hand was excellent, and it was evaluated as "◎".

[Examples 1 to 4, Comparative Examples 1 and 2]

In this example, the effect of the single yarn fineness on the spinning property, the abrasion resistance, and the hand feeling performance will be described.

The production conditions of Example 2 are shown below.

Using the spinning machine of Fig. 7, the first roll and the second roll are stretched, and after being temporarily wound up, the apparatus shown in Fig. 8 is used to perform a relaxation heat treatment between the supply roll and the slack roll, thereby producing the present invention. 56 dtex / 24 filaments of fiber. The manufacturing conditions used are as follows.

(spinning conditions)

Polymer ultimate viscosity: 1.00 dl/g

Particle drying temperature and water content: 155 ° C, 10 ppm

Extruder temperature: 295 ° C

Spinning head temperature: 300 ° C

Spinning nozzle: 24 mouths with a hole diameter of 0.25 mmφ per nozzle

Hot distance: 135 mm

Cooling air conditions: temperature 22 ° C, relative humidity 90%, speed 0.4 m / sec

Finishing agent: an aqueous emulsion containing a polyether ester as a main component (concentration: 15 wt%)

Finishing agent imparting rate: 0.75%

Distance from the spinning nozzle to the finish imparting nozzle: 100 cm

(volume conditions)

The first roller: speed is 1500 m / min, temperature is 90 ° C

2nd roller: speed is 3975 m/min, temperature is 130 °C

Coiler: SA-608 machine (manufactured by Asahi Engineering Co., Ltd.)

Cross angle: 5.8 degrees

(relaxation heat treatment)

Supply roller: speed 555 m/min, temperature 85 °C

Heating plate temperature: 180 ° C

Relaxation roller: speed is 500 m/min, temperature is not heated (room temperature)

Relaxation tension: 0.25 cN/dtex

Relaxation rate: 9%

Volume: 1 kg / 1 weft tube

The physical properties of the obtained fiber and the evaluation results are shown in Table 1 below. Further, in Example 1, Examples 3 to 4, and Comparative Examples 1 and 2, as shown in Table 1, fibers were produced under the same conditions as in Example 2 except that conditions such as the number of nozzles and the amount of discharge were changed.

As is clear from Table 1, the fibers obtained in the examples of the present invention showed good results in terms of spinnability, yarn abrasion resistance, and hand feeling.

In Comparative Example 1, since the single yarn fineness was smaller than the range defined by the present invention, although the hand feeling was good, the effect expected by the present invention was not obtained in terms of yarn abrasion resistance.

In Comparative Example 2, the single yarn fineness was larger than the range defined by the present invention. Therefore, although the yarn abrasion resistance was good, the hand feeling was hard, and the desired effect of the present invention was not obtained.

[Examples 5 and 6, Comparative Examples 3 and 4]

In this example, the effect of the ultimate viscosity is explained.

When the same spinning, elongation, and relaxation heat treatment as in Example 2 was carried out, the ultimate viscosity of the polymer used was changed to be spun and wound, and the fibers of Examples 5 and 6 and Comparative Examples 3 and 4 were obtained.

The physical properties of the fibers obtained by the respective examples and comparative examples and the evaluation results are shown in Table 1.

As is clear from Table 1, the fibers obtained in the examples of the present invention showed good results in terms of spinnability, yarn abrasion resistance, and hand feeling.

In Comparative Example 3, the ultimate viscosity was lower than the range specified in the present invention, so that the effect expected by the present invention was not obtained in terms of yarn abrasion resistance.

In Comparative Example 4, the ultimate viscosity was higher than the range defined by the present invention, so that the texture was deteriorated, and the effects expected by the present invention were not obtained.

[Examples 7 and 8, Comparative Example 5]

In this example, the effect of the stretching ratio will be described.

The fibers of Examples 7 and 8 and Comparative Example 5 were obtained by changing the ratio of the stretching ratio to the ultimate stretching ratio and the relaxation ratio in the same spinning, stretching, and relaxation heat treatment as in Example 2.

The physical properties of the fibers obtained by the respective examples and comparative examples and the evaluation results are shown in Table 1 below.

As is clear from Table 1, the fibers obtained in the examples of the present invention showed good results in terms of spinnability, yarn abrasion resistance, and hand feeling.

In Comparative Example 5, the limit stretch ratio was higher than the range specified in the present invention, so that the spinning property was deteriorated and the fiber could not be obtained.

[Examples 9 and 10, Comparative Examples 6 and 7]

In this example, the effect of the heat treatment temperature will be described.

The fibers of Examples 9 and 10 and Comparative Examples 6 and 7 were obtained by changing the heat treatment temperature in the same spinning, stretching, and relaxation heat treatment as in Example 2.

The physical properties of the fibers obtained by the respective examples and comparative examples and the evaluation results are shown in Table 1 below.

As is clear from Table 1, the fibers obtained in the examples of the present invention showed good results in terms of spinnability, yarn abrasion resistance, and hand feeling.

In Comparative Example 6, since the heat treatment temperature is lower than the range specified by the present invention, the value of the minimum differential Young's modulus of the region of 2% or more and 5% or less becomes 20 cN/dtex or more, and the yarn wearability is high. The effects expected by the present invention are not obtained.

In Comparative Example 7, since the heat treatment temperature was higher than the range considered by the present invention, the step tension was lowered and the spinning property was deteriorated, so that the fiber of the present invention could not be obtained.

[Examples 11 to 13, Comparative Examples 8 to 10]

In this example, the effect of the relaxation rate at the time of the relaxation heat treatment will be described.

In the spinning, stretching, and relaxation heat treatments similar to those in the second embodiment, the speeds of the rolls associated with the relaxation heat treatment were changed, and the fibers having different relaxation rates as shown in Examples 11 and 12 and Comparative Examples 8 to 10 were obtained. Further, Comparative Example 9 is a fiber which is not subjected to relaxation heat treatment after being wound up under the same spinning ‧ extension conditions as in Example 2.

The physical properties of the fibers obtained by the respective examples and comparative examples and the evaluation results are shown in Table 1 below.

As is clear from Table 1, the fibers obtained in the examples of the present invention showed good results in terms of spinnability, yarn abrasion resistance, and hand feeling.

In Comparative Examples 8 and 9, the relaxation rate was small as compared with the range defined by the present invention, Comparative Example 8 was -5%, that is, the elongation heat treatment was performed, and Comparative Example 9 was the case where the relaxation heat treatment was not performed. In such cases, the effect of the relaxation of the alignment of the polyester molecules in the fibers by the relaxation heat treatment is small or absent, so that the minimum differential Young's modulus becomes 20 cN/dtex or more, and the yarn abrasion resistance is not improved.

In Comparative Example 10, the relaxation rate was large as compared with the range defined by the present invention, and the step tension during the relaxation heat treatment was lowered, so that the spinning property was deteriorated, and the fiber of the present invention could not be obtained.

Further, in the thirteenth embodiment, the spinning machine and the winder as shown in Fig. 9 were used, and after stretching between the first roller and the second roller, the second roller and the third roller were loosened without being temporarily wound up. Heat treatment, thereby producing fibers of the 56 dtex/24 filaments of the present invention. The conditions were set to be the same as in Example 2 before the particles were dried to the second roll, and the conditions after the third roll were reset. The conditions for resetting are as follows.

(spinning conditions)

Particle drying temperature and water content: 155 ° C, 10 ppm

Extruder temperature: 295 ° C

Spinning head temperature: 300 ° C

Spinning nozzle: 24 nozzles with a hole diameter of 0.25 mmφ per nozzle

Thermal distance: 135 mm

Cooling air conditions: temperature 22 ° C, relative humidity 90%, speed 0.4 m / sec

Finishing agent: an aqueous emulsion containing a polyether ester as a main component (concentration is 15 wt%)

Finishing agent imparting rate: 0.75%

Distance from the spinning nozzle to the finish imparting nozzle: 100 cm

(volume conditions)

The first roller: speed is 1500 m / min, temperature is 90 ° C

2nd roller: speed is 3975 m/min, temperature is 130 °C

Third roller: speed is 3617 m/min, temperature is 180 °C

Coiler: SA-608 machine (manufactured by Asahi Engineering Co., Ltd.)

Cross angle: 5.8 degrees

[Embodiment 14]

According to the manufacturing conditions of Example 2, the polyester filament having an ultimate viscosity of 0.86 and a circular cross section of 34 dtex/12 filaments was spun without a relaxation heat treatment, and the obtained polyester filament was used as a warp yarn. And the weft yarn, using a water jet shuttle looms, weaving a fabric of 2 mm latitude and longitude. After scouring the obtained fabric, it was pre-formed at 190 ° C for a period of 60 seconds at a shrinkage rate of 3% and a longitudinal shrinkage of 5%, and then dyed by a flow dyeing machine, dried, and then at 170 ° C. The degree of crease was stretched and stretched for 20 seconds, and calendering was carried out at 160 °C.

The properties of the obtained fabric were as shown in Table 2 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 15]

The warp yarn and the weft yarn were polyester yarns having a W-shaped cross section of 11 dtex/10 filaments having an ultimate viscosity of 1.20, which was produced without the relaxation heat treatment according to the production conditions of Example 2, except for the examples. 14 The same method is used for weaving and processing.

The properties of the obtained fabric are as shown in Table 2, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 16]

The warp yarn was the polyester filament of Example 1, and the weft yarn was made of a polyester filament having a final viscosity of 0.68 of 56 dtex/24 filaments, which was produced without the relaxation heat treatment according to the production conditions of Example 2, and the texture of the fabric was a tower. In the same manner as in Example 14, weaving and processing were carried out.

The properties of the obtained fabric are as shown in Table 2, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 17]

According to the manufacturing conditions of Example 2, a polyester filament having an ultimate viscosity of 0.85 and a circular cross section of 34 dtex/12 filaments was spun, and after being temporarily wound up, the apparatus shown in Fig. 8 was used, at 160 The thermal relaxation treatment was carried out at a heating plate temperature of ° C in such a manner that the relaxation rate reached 10%. The yarn was weaved in the same manner as in Example 1 except that the yarn was used as a warp yarn or a weft yarn. After scouring the obtained fabric, it was pre-formed at 190 ° C for 60 seconds under conditions of a shrinkage ratio and a longitudinal shrinkage ratio of 0%, and then dyed by a flow dyeing machine, dried, and then subjected to 170 ° C. The final final setting of the second is then calendered at 160 °C.

The properties of the obtained fabric are as shown in Table 2, and the abrasion resistance was excellent, and the hand feeling was also good.

[Embodiment 18]

Weaving and processing were carried out in the same manner as in Example 17 except that the shrinkage ratio of 3% and the shrinkage ratio of 7% were 190 ° C for 60 seconds. The physical properties of the obtained woven fabric were as shown in Table 2 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Embodiment 19]

A woven fabric similar to that of Example 14 was woven and processed using a polyester-based fiber having an ultimate viscosity of 0.62 which was produced without the relaxation heat treatment under the production conditions of Example 2. The properties of the obtained fabric were as shown in Table 2 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Comparative Example 11]

A fabric similar to that of Example 14 was woven and processed using the polyester filament of 7 dtex/5 filaments having an ultimate viscosity of 0.71 which was produced without the relaxation heat treatment under the production conditions of Example 2. The properties of the obtained fabric were as shown in Table 2 below, and the abrasion resistance was poor.

[Comparative Example 12]

The fabric of the same fabric as in Example 17 was woven and processed at a temperature of 180 ° C at a temperature of 180 ° C without performing thermal relaxation treatment of the yarn. . The properties of the obtained fabric were as shown in Table 2 below, and the abrasion resistance was poor.

[Comparative Example 13]

The polyester undrawn yarn of the Y-shaped cross section of the 265 dtex/36 filaments having an ultimate viscosity [η] of 0.65 was extended 3.3 times, and a relaxation heat treatment of 0.2% was carried out at 150 °C. Thereafter, the liquid entanglement treatment was carried out at a relaxation rate of 0.6% and an air pressure of 4 kg/cm ² . The yarn is used as a warp yarn, usually a polyester yarn of 84 dtex/36 filaments as a weft yarn, and a fabric is produced by WJL (water jet loom, water jet loom) (warp yarn / inch, weft 90 / inch) ), the usual dyeing process was carried out at a drawing rate of 5% (shrinkage rate: -5%). The properties of the obtained fabric were as shown in Table 2 below, and the abrasion resistance was poor.

[Example 20]

Using a 1H false twisting machine, at a yarn speed of 577 m/min, a draw ratio of 1.75, and a temperature of 190 ° C, the ultimate viscosity [η] produced without the relaxation heat treatment according to the manufacturing conditions of Example 2 was 0.75. 166 dtex/48 filaments of round profile polyester filaments for false twisting. Thereafter, a four-stage smooth tissue knitted fabric was produced using a double-sided knitting machine. After the obtained knitted fabric was scoured, it was subjected to a predetermined type at a shrinkage rate of 10% at 200 ° C for 30 seconds, and then dyed and dried by a liquid flow dyeing machine using a usual method. Thereafter, final setting was carried out for 20 seconds at 170 ° C under the width setting of the degree of flattening wrinkles.

The properties of the obtained knitted fabric were as shown in Table 3 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 21]

A polyester filament having a circular cross section of a dtex having a limit viscosity [η] of 0.85, which is not subjected to a relaxation heat treatment, which was produced according to the production conditions of Example 2, was used in the same manner as in Example 1 except that The same method is used for preparation and processing.

The properties of the obtained knitted fabric were as shown in Table 3 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 22]

According to the manufacturing conditions of Example 2, a polyester filament of 84 dtex/24 filaments having an ultimate viscosity [η] of 0.70 which was produced without relaxation heat treatment was used for the front side, and the ultimate viscosity [η] was 0.46 of 84 dtex. / 72 filaments of polyester processed yarn (false twist processing at 210 ° C) for the back side, making mesh knitted fabric. After the obtained knitted fabric was scoured, it was subjected to a predetermined type at a shrinkage rate of 10% at 200 ° C for 30 seconds, and then dyed and dried by a liquid flow dyeing machine using a usual method. Thereafter, final setting was carried out for 20 seconds at 170 ° C under the width setting of the degree of flattening wrinkles. The properties of the obtained knitted fabric were as shown in Table 3 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 23]

Using a 28GG warp knitting machine, a polyester W-shaped cross-section processed yarn having a final viscosity [η] of 0.75 at 56 dtex/30 f was produced in the front portion using the production conditions according to Example 2 without performing relaxation heat treatment. A polyester circular cross-section processed yarn having an intrinsic viscosity [η] of 0.68 at 56 dtex/24 f was used, and a 44 dtex polyurethane fiber was used at the rear, and it was fabricated by a tricot half-structure. . The same processing as in Example 20 was carried out to obtain a knitted fabric having a basis weight of 255 g/m ² . The surface composed of the yarn supplied from the front side was measured as a surface, and the characteristics of the obtained knitted fabric were as shown in Table 3 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Example 24]

For polyester filaments with an ultimate viscosity of 0.85 and a circular profile of 84 dtex/24 filaments, after temporarily coiling, use the apparatus shown in Figure 8 at a heating plate temperature of 160 °C. The relaxation heat treatment was carried out in such a manner that the relaxation rate reached 10%. The yarn was false twisted using a 1H false twisting machine at a yarn speed of 577 m/min, a draw ratio of 1.75, and a temperature of 190 °C. Thereafter, a four-stage smooth tissue knitted fabric was produced using a double-sided knitting machine. After the obtained knitted fabric was scoured, it was subjected to a predetermined type at a shrinkage rate of 10% at 200 ° C for 30 seconds, and then dyed and dried using a liquid flow dyeing machine by a usual method. Thereafter, final setting was carried out for 20 seconds at 170 ° C under the width setting of the degree of flattening wrinkles. The properties of the obtained knitted fabric were as shown in Table 3 below, and the abrasion resistance was excellent, and the hand feeling was also good.

[Comparative Example 14]

The false twist of the polyester fiber was processed in the same manner as in Example 20 except that the temperature was 210 ° C / 150 ° C by using 2H. The characteristics of the resulting knitted fabric are as shown in Table 3 below, and the abrasion resistance is poor.

[Comparative Example 15]

The same composition as in Example 20 was prepared except that the polyester yarn having a final viscosity [η] of not less than 0.56 dtex/12 filaments produced by the relaxation treatment was not used. Processing. The characteristics of the resulting knitted fabric are as shown in Table 3 below, and the abrasion resistance is poor.

[Comparative Example 16]

Using the polyester filament of 84 dtex/144 filaments whose ultimate viscosity [η] was not subjected to the relaxation heat treatment, which was produced under the production conditions of Example 2, was the same as that of Example 20, except that the composition was the same as that of Example 20, Processing.

The characteristics of the resulting knitted fabric are as shown in Table 3 below, and the abrasion resistance is poor.

[Comparative Example 17]

The preparation of the same manner as in Example 22 was carried out at 190 ° C at a tentering ratio of 20% (shrinkage ratio: -20%), and the same preparation as in Example 22 was prepared and processed.

The characteristics of the resulting knitted fabric are as shown in Table 3 below, and the abrasion resistance is poor.

[Industrial availability]

According to the present invention, it is possible to obtain a polyester fiber which is excellent in abrasion resistance, particularly suitable for a thin woven fabric, and a woven fabric containing the same, so that it is difficult to produce a fabric, particularly a windproof jacket, using the fabric of the fiber. Fleece or breakage caused by rubbing of the crotch or thighs in the outer garments such as down jackets, especially for the strong contact friction between the clothing materials and other objects that occur when wearing sportswear and outdoor clothing. Strong and handy fabric. Moreover, the fabric which is required to have abrasion resistance can be made lighter and thinner.

1. . . Polymer dryer

2. . . Extruder

3. . . Bent pipe

4. . . Spinning head

5. . . Spinning combination

6. . . Spinning nozzle

7. . . Non-supply area

8. . . Cooling wind

9. . . Finishing agent

10. . . First roller

11. . . Second roller

12, 13. . . Fiber package yarn

14. . . Supply roller

15. . . Heating plate

16. . . Slack roll

17. . . Yarn guide

18. . . Wire loop guide

19. . . Fiber weft tube

20. . . Third roller

twenty one. . . Movable arm

twenty two. . . motor

twenty three. . . pillar

twenty four. . . Abrasion paper

25. . . Sample

26. . . load

Figure 1 is a stress-strain curve of the polyester yarn of the present invention (Example 2);

Figure 2 is a differential poplar modulus-strain curve of the polyester yarn of the present invention (Example 2);

Figure 3 is a stress-strain curve of the polyester yarn other than the present invention (Comparative Example 8);

Figure 4 is a differential poplar modulus-strain curve of a polyester yarn other than the present invention (Comparative Example 8);

Figure 5 is a stress-strain curve of the polyester yarn other than the present invention (Comparative Example 9);

Figure 6 is a differential poplar modulus-strain curve of a polyester yarn other than the present invention (Comparative Example 9);

Figure 7 is a schematic view showing an example of a spinning extension heat treatment apparatus for obtaining the stretched yarn of the present invention;

Figure 8 is a schematic view showing an example of an apparatus used for performing relaxation heat treatment on the stretched yarn of the present invention;

Figure 9 is a schematic view showing an example of a direct spinning extension heat treatment apparatus of the present invention;

Fig. 10 is a schematic view showing a yarn abrasion tester used in the evaluation of the present invention.

1. . . Polymer dryer

2. . . Extruder

3. . . Bent pipe

4. . . Spinning head

5. . . Spinning combination

6. . . Spinning nozzle

7. . . Non-supply area

8. . . Cooling wind

9. . . Finishing agent

10. . . First roller

11. . . Second roller

12. . . Fiber package yarn

Claims (9)

A polyester fiber characterized in that it is an abrasion resistant polyester fiber having ethylene terephthalate as a repeating unit of 97 mol% or more, and satisfies the following requirements (1) to (6) (8): (1) the fineness is 8 dtex or more and 200 dtex or less; (2) the single yarn fineness is 1.0 dtex or more and 4.0 dtex or less; (3) the breaking strength is 3.5 cN/dtex or more; (4) the elongation at break The rate is 20% or more and 50% or less; (5) The minimum differential Young's modulus of the region on the stress-strain curve of the fiber is 2% or more and 5% or less is 20 cN/dtex or less; (6) Yarn wear The intensity is 0.5 times/dtex or more; and (8) the crystallinity is 60% to 90%, and the degree of alignment is 0.70 to 0.92. The polyester fiber of claim 1 further satisfies the following requirements (7): (7) the ultimate viscosity is 0.70 dl/g or more and 1.30 dl/g or less. An abrasion resistant woven fabric comprising the polyester fiber of claim 2. The abrasion-resistant woven fabric of claim 3, which is a fabric having a weight reduction rate of 5% or less under 30,000 times in the Martindale abrasion test. An abrasion resistant woven fabric according to claim 3 or 4, wherein the woven fabric is a woven taffeta fabric. The abrasion-resistant woven fabric of claim 3, which is a knitted fabric having a basis weight of 80 to 350 g/m ² . A method for producing an abrasion resistant polyester fiber according to claim 2, The method comprises the following steps: melt-spinning a polyester having an ultimate viscosity of 0.70 dl/g or more and 1.30 dl/g or less; and extending at a stretching ratio of 65% or more and 85% or less of the ultimate stretching ratio; and then at 120 ° C The heat treatment at a heat treatment temperature of 220 ° C or lower is performed at a relaxation rate of 5% or more and 15% or less. The method for producing an abrasion-resistant polyester fiber according to claim 7, wherein the film is temporarily taken up after the stretching treatment, and then subjected to a relaxation heat treatment. The method for producing an abrasion-resistant polyester fiber according to claim 7, which is subjected to a relaxation heat treatment without being temporarily wound up after the relay stretching treatment.