JPH04240230A - Ultrafine false twisting yarn and water absorbing cloth containing the same - Google Patents

Abstract

PURPOSE:To obtain ultrafine false twist yarn having permanent water absorbing effect, excellent soft feeling and subduced natural shine and further water absorbing cloth containing the same twisting yarn. CONSTITUTION:The objective ultrafine false twisting yarn being a false twisting yarn consisting of a polyester multifilament in which a specific sulfonate compound is blended and characterized by being <=0.7 denier in the single yarn fineness and 2.0-3.0 in average value of coefficient (S) of flat cross section, >=1.3 in distribution ratio (gamma) of coefficient of flat cross section and further 5-12% in total crimp ratio (TC) and the objective water absorbing cloth containing the ultrafine false twisting yarn having porous structure and obtained by removing the above-mentioned sulfonate compound by alkali treatment.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to ultra-fine false twisted yarn, and more specifically, when made into fabric, it has excellent water absorbency and texture.
Moreover, it relates to ultra-fine false-twisted yarn that exhibits a calm and natural luster.

0002

BACKGROUND OF THE INVENTION Processed polyester yarns obtained by false twisting have been favorably used for clothing because of their high bulkiness, good strength and elongation properties, easy care properties, and dry feel. Recently, water-absorbing yarn has come into the spotlight. However, synthetic fibers, which are the raw materials for such processed yarns, generally have low water absorption, so when used in clothing that comes in direct contact with the skin, they are uncomfortable to wear, which limits the expansion of their uses. Therefore, as a method for improving water absorbency, a method has been proposed in which the cross-sectional shape of fibers is made into a specific irregular cross-sectional shape to improve water absorbency (Japanese Patent Laid-Open Publication No. 151617/1984, etc.). However, in this case, if false twisting is applied to the woven or knitted fabric to give it elasticity and bulk, the cross-sectional shape will be greatly deformed due to the false twisting process, making it impossible to maintain sufficient water absorbency after the false twisting process. However, this is the reality.

[0003] Furthermore, a method of dissolving and removing the sea component of sea-island composite fibers (Japanese Patent Publication No. 48-25362) and a method of splitting bonded composite fibers (Japanese Patent Laid-Open Publication No. 130317-1982) have also been proposed. There is. However, in this case as well, a special spinning device is required, moreover, two or more types of polymers are used, and operations such as melting and splitting are performed, so there are disadvantages in that the product is very expensive.

By the way, water absorption is an extremely important factor that affects the comfort of clothing when sweating. It has been well known that natural fibers retain moisture well due to their inherent water absorption ability. In this case, when the fabric retains water and comes into contact with the skin, the user feels cold and uncomfortable. This phenomenon can even be seen in cotton, which is generally said to have excellent water absorbency. In order to reduce this discomfort, it is desirable that the fabric absorb sweat generated on the skin as quickly as possible, and that as little sweat as possible remains on the fabric surface that comes into contact with the skin.

[0005]

SUMMARY OF THE INVENTION The present invention eliminates the drawbacks of the prior art as described above, has a permanent water absorption effect,
It is an object of the present invention to provide an ultra-fine false-twisted yarn that exhibits an excellent soft feel and a calm natural luster, and furthermore, to provide a water-absorbent fabric containing the textured yarn.

[0006]

[Means for Solving the Problems] The present inventors previously proposed in Japanese Patent Application No. 2-320679 by designing the cross-sectional Hempey coefficient and the cross-sectional Hempey coefficient distribution shape of a polyester multifilament of ultra-fine false twisted yarn. proposed a material with excellent water absorbency that exhibits a softer texture than conventional polyester processed yarns, causes less discomfort due to sweating. However, with the above-mentioned false twisted yarn containing a specific sulfonate compound as a micropore-forming agent in the filament, especially after removing the micropore-forming agent, the above-mentioned soft texture and discomfort due to sweating are lost. In addition to excellent water absorbency, the absorption and reflection of light (refractive index) penetrates, and the material is free from the glaring luster rings found in synthetic fibers, giving it a natural feel and a calm luster. found.

According to the present invention, the following general formula [I]

0
008]

[Formula, W is a hydrogen atom or an ester-forming functional group, M2
and M3 represents a metal, and n represents an integer of 1 or 2. ] A sulfonate compound shown as a micropore-forming agent is blended as a micropore-forming agent, the false twisted yarn is made of polyester multifilament with a single filament fineness of 0.7 denier or less, and has an average cross-sectional Hempey coefficient (S) of 2. 0 to 3.0, the cross-sectional Hempey coefficient distribution ratio (γ) is 1.3 or more, and the total crimp ratio (T
．． There is provided an ultra-fine false twisted yarn characterized in that C) is 5 to 12%.

However, the cross-sectional Hempey coefficient (S) and the cross-sectional Hempey coefficient distribution ratio (γ) comply with the following definitions.

[0010] Cross-sectional Hempey coefficient (S) = L1 /L2 where, L1
is the length of the longest part (long axis) in the cross section of the single fiber, and L2 is the maximum width perpendicular to the long axis in the cross section of the single fiber.

[0011] Cross-sectional Hempey coefficient distribution ratio (γ) = γ1 / γ2 Here, γ1 is the 75th yarn counting from the smallest Hempey coefficient when the total number of single yarns constituting the above-mentioned ultra-fine false twisted yarn is 100. The Henpey coefficient of a single yarn, γ2, is the Henpey coefficient of the 25th single yarn, counting from the one with the smallest Henpey coefficient, when the total number of single yarns constituting the above-mentioned water-absorbent ultrafine false twisted yarn is 100.

Furthermore, according to the present invention, a water-absorbing fabric is obtained by treating a fabric containing 50% by weight or more of the above-mentioned ultrafine false-twisted yarn with an alkali to remove the micropore-forming agent contained in the textured yarn. provided.

The present invention will be explained in detail below.

[0014] Polyesters used in the present invention include those commonly known as polyester fibers, such as polyethylene terephthalate and polybutylene terephthalate, and in some cases, dicarboxylic acids such as isophthalic acid and sulfoisophthalic acid, alcohols such as polyethylene glycol, etc. Copolymerization of these components can be mentioned.

On the other hand, as the micropore forming agent, a sulfonate compound represented by the following general formula [I] is used.

[0016]

[Image Omitted] In the formula, M2 and M3 are metals, and M2 is particularly an alkali metal, an alkaline earth metal, Mn 1/2,
Co 1/2 or Zn 1/2 is preferable, especially L
i, Na, K, Ca 1/2, Mg 1/2 are particularly preferred, and M3 is particularly preferably an alkali metal or alkaline earth metal, among which Li, Na, K, Ca1
/2, Mg 1/2 are particularly preferred, M2 and M3 can be the same or different. Also, n is 1 or 2
is an integer. W is a hydrogen atom or an ester-forming functional group, and the ester-forming functional group is -COOR'''(
However, R''' is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group) or -CO[O(CH2)m]pO
H (where m is an integer of 1 or more, p is an integer of 1 or more), etc. are preferred.

Preferred specific examples of such sulfonate compounds include sodium 3-carbomethoxy benzenesulfonate-5-sodium carboxylate, potassium 3-carbomethoxy sodium benzenesulfonate-5-carboxylate, and 3-carbomethoxy sodium benzenesulfonate-5-carboxylate.・Potassium benzenesulfonate-5-carboxylic acid potassium, 3-hydroxyethoxycarbonyl sodium benzenesulfonate-
Sodium 5-carboxylate, Sodium 3-carboxybenzenesulfonate-5-sodium carboxylate, 3
-Hydroxyethoxycarbonyl benzenesulfonic acid Na-5-carboxylic acid Mg 1/2, benzenesulfonic acid Na-3,5-dicarboxylic acid Na, benzenesulfonic acid Na-3,5-dicarboxylic acid Mg 1/2, etc. be able to.

The amount of the sulfonate compound blended is suitably in the range of 0.3 to 15 mol%, particularly preferably in the range of 0.5 to 5 mol%, based on the acid component constituting the polyester.

[0019] The present invention is made of ultra-fine false twisted yarn mainly made of polyester blended with such a sulfonate compound, but in this case, the single yarn fineness (filament denier) must be 0.7 denier or less. is necessary. If it exceeds 0.7 denier, not only will the texture become rough and hard, but the fiber density will not be increased, the strength of the fabric will decrease, and as a result, the water absorption will also tend to decrease, and the skin will be uncomfortable due to sweating. It is not possible to obtain a fabric with less texture. Moreover, it is preferable that the processed yarn as a whole is composed of 100 to 180 filaments.

[0020] In order for the extra-fine false twisted yarn of the present invention to exhibit water absorption performance, the average value of the cross-sectional Hempey coefficient (S) should be 2.0 to 3.0 (preferably 2.2 to 2.0). 8)
It is necessary that The cross-sectional Hempey coefficient (S) referred to here is the value defined below, and the cross-sectional Hempey coefficient of each filament is determined from an enlarged photograph of the cross section of the multifilament, and randomly selected at least 10
This is the average value measured at 0 locations.

[0021] Cross-sectional Hempey coefficient (S) = L1 /L2 where, L1
is the length of the longest part (long axis) in the cross section of the single fiber, and L2 is the maximum width perpendicular to the long axis in the cross section of the single fiber.

[0022] Here, L1 and L2 will be explained using a specific example of the fiber cross section shown in FIG. A line is drawn at the longest part of the fiber cross section in FIG. 1, this length is defined as the long axis L1, and then the maximum width measured perpendicular to this long axis L1 is determined and this is defined as L2.

The above-mentioned cross-sectional Hempey coefficient (S) is an important factor for the gloss effect, water absorption performance, and water retention effect when made into a woven or knitted fabric, and if the cross-sectional Hempey coefficient (S) is less than 2.0, the filament The "diffuse reflection" particularly increases, and the calm, natural gloss that is the objective of the present invention cannot be obtained, and the water absorption effect cannot be fully exhibited.

On the other hand, if the cross-sectional Henpey coefficient (S) exceeds 3.0, the difference in gloss is too strong and the gloss (glitter)
is not desirable because it emphasizes too much.

More importantly, the cross-sectional Hempey coefficient distribution ratio (γ) defined below is 1.3 or more, preferably 1.3.
It must be 5 or more.

[0026] Cross-sectional Hempey coefficient distribution ratio (γ) = γ1 / γ2 Here, γ1 is the 75th yarn counting from the smallest Hempey coefficient when the total number of single yarns constituting the above-mentioned ultra-fine false twisted yarn is 100. The Henpey coefficient of a single yarn, γ2, is the Henpey coefficient of the 25th single yarn counting from the smallest Henpey coefficient when the total number of single yarns constituting the above-mentioned ultra-fine false twisted yarn is 100.

The above cross-sectional Hempey coefficient distribution ratio (γ) is:
Similar to the cross-sectional Hempey coefficient (S) mentioned above, it is an important factor regarding the effect of water retention in the fine gaps between fibers, and also the natural calm gloss effect and water absorption effect when made into woven and knitted fabrics. has a large effect on

Incidentally, the average value of the cross-sectional Hempey coefficient (S) obtained from ordinary round cross-section yarn is 1.0 to 1.6, and the cross-sectional Hempey coefficient distribution ratio (γ) is 1.2 or less. The resulting woven or knitted fabric has large gloss spots and poor water absorption ability.

Therefore, in the present invention, it is necessary that the cross-sectional Hempey coefficient distribution ratio (γ) is 1.3 or more, preferably 1.5 or more, and if these requirements are not met (
When γ = less than 1.3), not only dye absorption occurs in the fine gaps between fibers, but also water becomes difficult to retain.
A calm, natural luster cannot be obtained, and stable water absorption performance cannot be obtained. In other words, the reason why the material feels sticky and uncomfortable on the skin is considered to be mainly due to the large contact area per unit fineness when touching the skin.

That is, in the case of fibers with a high water retention rate, such as cotton fibers, the surface of the skin becomes wet and sticky, but in the case of the ultrafine false twisted yarn of the present invention, the surface that comes into contact with the skin is always made of ultrafine fibers. The skin is covered with a thin layer of water, giving it a dry feel and a soft texture.

[0031] Since the ultra-fine false twisted yarn of the present invention has a wide section distribution of single filaments, water is easily retained in the fine gaps between the fibers, there is no sticky feeling, and dye absorption is uniform. , you can obtain a calm, natural luster without any irritation due to differences in dyeing.

Furthermore, gentle crimp occurs between the portions with small and large cross-sectional Hempey coefficients (S) due to slight structural differences in crystallinity, orientation, etc., resulting in imbalance in the fiber axis direction. It is possible to create a fabric with an excellent texture that increases the looseness of the yarn and gives it a soft texture.

Here, in the cross-sectional Hempey coefficient distribution ratio (γ), the method of specifying the 25th or 75th single yarn counting from the one with the smallest Hempey coefficient is as follows. (a) For example, if the total number of single yarns is 100, the 15th single yarn 100 x 25/100 = 25 In other words, the 25th single yarn counting from the smaller S is the "25th single yarn" corresponds to

・75th single yarn 100×75/100=75 In other words, the 75th single yarn counting from the smaller S
(b) For example, if the total number of single yarns is 150: - 25th single yarn 150 x 25/100 = 37.5 In this case, specify the single yarn individually. Since it is not possible to
The average value of the S of the 37th single yarn and the S of the 38th single yarn counting from the smallest S is defined as the S of the "25th single yarn."

- 75th single yarn 150 x 75/100 = 112.5 In this case as well, since it is not possible to specify the single yarn alone, the S and 11 of the 112th single yarn counting from the smallest S
The average value with the third S is taken as the S of the 75th single yarn.

Furthermore, it is necessary from the viewpoint of water absorption that the total crimp rate (TC) of the ultrafine false twisted yarn of the present invention is in the range of 5 to 12%.

[0037]T. When C is less than 5%, the fabric feels soft to the touch, but lacks a sense of volume (swelling), and when made into a woven or knitted product (water-absorbing fabric), bulkiness is extremely poor and water absorption is also reduced.

On the other hand, T. If C exceeds 12%, the feeling of fullness (volume) is good, but the texture is rough and rough, and the final woven or knitted product (water-absorbing fabric) lacks the soft texture. Water absorption also decreases. Furthermore, in order to form a water-absorbing fabric, it is necessary to use 50% (weight) or more of extra-fine false twisted yarn. If the composition ratio is less than 50%, the resulting fabric will lack water absorption performance and soft texture, and will not be able to achieve the purpose of the present invention.

Next, the ultra-fine false twisted yarn of the present invention can be obtained, for example, by the process described below.

First, the thermoplastic polyester polymer containing the above-mentioned micropore-forming agent is heated and melted, and is discharged through a spinneret hole according to a conventional spinning method. The polymer discharged in this way is
Melt spinning is carried out at a take-up speed (spinning speed) of 00 m/min or less. At that time, the birefringence index (Δn) of the undrawn polyester yarn is 0.
．． Must be between 0.03 and 0.06. Spinning speed is 3
If the speed is less than 0.000 m/min and Δn is less than 0.03, the yarn will become brittle during false twisting and breakage will occur frequently, and the cross-sectional Hempey coefficient (S) and cross-sectional Hempey coefficient of the resulting processed yarn will decrease. The distribution ratio (γ) tends to be too skewed, which is not preferable.

On the other hand, if the spinning speed exceeds 4000 m/min and Δn exceeds 0.06, fuzz will occur frequently during false twisting, which will have a negative effect on the quality of the fabric, and will also reduce the cross-sectional Hempeian coefficient of the resulting processed yarn. The average value of (S) is less than 2.0, the cross-sectional Hempey coefficient distribution ratio (γ) is less than 1.3, and the desired calm glossiness and water absorption effect cannot be obtained.

Next, the yarn obtained in this way is shown in FIG.
False twisting or stretching false twisting is performed by the steps shown in . That is, the above-mentioned highly oriented polyester undrawn yarn (original yarn) 1 is supplied to the feed roller 2 and intertwined by the interlacing air injection nozzle 3 provided between the first delivery roller 4 and the first delivery roller 4. The material is introduced into a false twisting device 7 through a heater 5 and a cooling plate 6, and taken by a second delivery roller 8, during which time it is false-twisted, set, and untwisted. Then the third
Cheese 11 passes through delivery roller 9 and oil supply device 10
It is wound up.

[0043] What is important here is that the undrawn yarn made of the above-mentioned polyester multifilament is pre-entangled and then drawn and false-twisted.

Furthermore, in the present invention, by applying interlacing in advance before drawing and false-twisting, layer transition of the constituent single yarns is prevented at the interlaced portion during false-twisting, and crimping and crimp formation is prevented. is hindered.

On the other hand, in the part where confounding is not added,
Layer transition of the single yarn occurs and a crimp is imparted. Since the multifilament is heat-set with entanglements, generally 50 or more entanglements/m, particularly 60 or more entanglements/m or more are applied in the length direction of the multifilament, resulting in ultra-fine fibers that do not generate caterpillar fuzz. Processed yarn is obtained. Furthermore, a false-twisted yarn with a desirable form of rich bulk, elasticity, and a plump feeling, in which the crimp form changes in the longitudinal direction of the multifilament, can be obtained.

[0046] To impart entanglement to the polyester filament yarn, a conventional fluid jet entanglement imparting device is used. The entanglement imparted before drawing and false twisting is completely different from the entanglement imparted for the purpose of giving convergence to the yarn after conventional false twisting. The textured yarn treated with interlacing after false twisting has a similar appearance to the false twisted yarn obtained in the present invention, but the entanglement easily disappears with a slight squeeze, and furthermore, the interlaced portions and non-entangled portions are Since the intertwined portions are both false-twisted to the same degree, the relaxation heat treatment results in a uniform crimp form in the length direction of the textured yarn.

[0047] This particularly damages the ultra-fine yarn during the interlacing process after false twisting, resulting in long-length "caterpillar-like fuzz" (
Fuzz length of 3 to 10 mm) is generated, leading to deterioration of quality, and there is a problem in unwinding property in post-processing (weavability in the market).

[0048] Similarly, "caterpillar-like fuzz" occurs when no interlacing is applied before the stretching and false twisting process, or when interlacing is applied but the degree of entanglement is less than 50 strands/m. It tends to be undesirable.

In drawing and false twisting, the above-mentioned highly oriented undrawn yarn was subjected to a false twist number T (t/m) of 26000/De1/2.
≦T≦34000/De1/2 (De...Total denier of processed yarn), false twisting temperature H (℃) 130≦H≦180
Stretch and false twist at ℃.

[0050] The number of false twists T (t/m) is 26000/De1
If it is less than /2, the polyester processed yarn obtained not only has poor crimpability and bulkiness, but also fails to have the desired Hempey coefficient in cross section. Woven or knitted fabrics woven or knitted from such processed yarns lack luster and texture, and cannot be used as water-absorbent fabrics.

On the other hand, when the number of false twists T (t/m) is 34000/
If De1/2 is exceeded, fuzz will occur during stretching and false twisting, and the cross-sectional Hempey coefficient distribution (γ) will tend to be biased, making it impossible to obtain the desired water-absorbent fabric.

[0052] Furthermore, when the false twisting temperature is less than 130°C, the total crimp of the obtained ultrafine textured yarn is less than 5%,
On the other hand, when the temperature exceeds 180° C., the total crimp exceeds 12% and a rough feeling occurs, which is undesirable because the water-absorbent fabric is undesirable in terms of texture and feel.

Generally, in order to increase the degree of cross-sectional stiffness, it is possible to increase the spinning speed, increase the number of twists, increase the processing temperature, and make the single yarn thinner, but these conditions can be adjusted as described above. By optimizing the conditions limited to , the desired cross-sectional Hempey coefficient and cross-sectional Hempey coefficient distribution ratio can be obtained, and this results in a water-absorbent fabric with a calm, natural luster and a soft texture. It is possible.

[0054] In addition, in the conventional technology, in order to produce a false twisted yarn by imparting a first twist before the false twisting process,
The yarn before false twisting was twisted at around 300 T/m using an Italian twister, a double twister, or the like. In this method, the untwisted yarn that has been wound into a package is first rewound into a small package and then passed through a twisting machine.
The operation is extremely complicated, and the twisting speed is 20 m.
There is a problem that the production efficiency is low because the process speed is as slow as 1/min.

According to the present invention, the above-mentioned complicated yarn twisting process with poor production efficiency is omitted, and a simple and efficient ultra-fine false twisted yarn can be obtained.

[0056] In addition, the conventionally known methods of dissolving and dividing ultrafine fibers require complicated spinning steps and increase costs. In the present invention,
It has the advantage of being low-cost and easy to produce (using normal spinning methods).

[0057] Next, a water-absorbing fabric using the extra-fine false twisted yarn of the present invention will be described.

In order to obtain the water-absorbing fabric of the present invention, the ultra-fine false twisted yarn described above is subjected to alkaline treatment before weaving (that is, at the yarn stage) or after weaving and knitting. Treat with solution. By treatment with this alkaline solution, part or all of the micropore forming agent is dissolved and
When removed, fine pores are formed in the ultra-fine processed yarn. The micropores may be present only in a part of the cross section, but if possible, it is desirable for the micropores to be scattered throughout the entire cross section in order to improve water absorption. Further, the micropores are arranged in the fiber axis direction, and at least some of the micropores communicate with each other, and as a result, the outer wall and the inner wall of the fiber as a whole communicate through the micropores. It is something. These micropores are scattered as described above in the cross section of the fiber, and whether or not at least some of them are connected can be observed by enlarging the cross section of the fiber approximately 3000 times. Furthermore, the simplest and easiest way to check the communication state of micropores is to check the communication state of micropores with a length of several centimeters (
While observing a single thread (usually 5 cm) at a magnification of about 100 times with a normal microscope, if you place a drop of water (preferably colored water) in the middle of this single thread, the water will flow into the connecting part. You can easily check whether it is reached instantly or not.

The above-mentioned micropores are arranged in the direction of the fiber axis, and no fibrils are observed in the outer shape of the fiber, especially on the surface. The size of such micropores is 0.01 in diameter.
~3 μm, and the length is preferably 50 times or less than the diameter. If the diameter of the micropores is less than 0.01 μm, the water absorbing effect tends to decrease, and if the diameter exceeds 3 μm, sufficient fiber strength cannot be obtained. Furthermore, if the length of the micropores becomes longer than 50 times the diameter thereof, even if all other conditions are satisfied, the strength and fibril resistance of the fiber will decrease, which is not preferable.

[0060]

[Function] The ultra-fine false twisted yarn of the present invention has specified filament denier, average value of cross-sectional Hempey coefficient (S), distribution ratio of cross-sectional Hempey coefficient (γ); and total crimp rate (TC). As a result, it has a calm luster, a flexible texture, and has excellent water absorption with less discomfort caused by sweating. Moreover, since this false twisted yarn contains the sulfonate compound specified by (Chemical formula 1), the sulfonate compound is removed with alkali at the yarn or fabric stage to make the filament a porous structure. The absorption and reflection of light penetrates into the material, creating a material with a natural luster. Furthermore, a feature of the micropore-forming agent shown by (Chemical formula 1) is that there is almost no problem of reduction in wear strength due to fibrils caused by micropores formed by treatment with an alkaline solution. . Furthermore, since the micropores are also distributed in the outer layer of the constituent filaments of the false-twisted yarn, products made of fabrics containing such textured yarns quickly absorb sweat when worn. Furthermore, in addition to its high water absorbency, it exhibits a very soft texture and soft touch, making it suitable for inner clothing such as lingerie or baby clothing that comes in direct contact with the skin.

[0061] Also, a moderate dry feeling is imparted. This is thought to be due to the fact that the above-mentioned micropores cause the frictional properties of the extra-fine false twisted yarn to increase the difference between dynamic frictional resistance and static frictional resistance.

[0062] The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to these Examples.

[0063]

[Example] After adding 0.62 mol% of Na 3-carbomethoxybenzenesulfonate-Na 5-carboxylate to terephthalic acid to a polyethylene terephthalate polymer having an intrinsic viscosity ([η]c) of 0.635. , chipped according to a conventional method, dried, melted at a maximum of 300°C using a spinneret with 72 circular discharge holes with a hole diameter of 0.15φ, and spun at a high speed of 3000 m/min. 82 denier/144 filament, single yarn de=0
．． An ultrafine thread with a denier of 6 denier and a birefringence of Δn0.050 was obtained. The intrinsic viscosity [ηF] of the obtained spun yarn was 0.625
Met. The obtained yarn was subjected to an intertwining treatment and a drawing/false twisting process in the steps shown in FIG.

[0064] With the interlaced nozzle, the overfeed rate is 1.5% and the pneumatic pressure is 3 kg/cm2.
m entanglement, and then stretched at a draw ratio of 1.50, a heater temperature of 155° C., a circumscribed friction false twisting device as a false twisting device, a number of false twists of 4600 times/m, and a yarn speed of 600 m/min. False twisting was performed to obtain a processed yarn of 50 denier/144 filaments.

The physical properties of the processed yarn thus obtained are as follows:
The strength is 4.2 g/de, the silk factor is 24.0, and other physical properties (TC section distribution) are as shown in Table 1. In addition, the spinning condition is free from fluff of the ultra-fine processed yarn, and the strength is sufficiently good.

[0066] This ultra-fine false twisted yarn (50 denier/14
4 filaments, single yarn de = 0.35 de), and ultra-fine false twisted yarn obtained by changing processing conditions (Example ■ in Table 1)
Using
A plain woven fabric with 0 threads/inch x 80 threads/inch was woven. The fabric was scoured and relaxed at 80°C for 20 minutes, and then heated at 180°C for 20 minutes.
A 45 second preset was carried out, followed by a normal dyeing process and a final set. The texture and water absorbency of this fabric were measured, and the results are shown in Table 1.

[0067] Also, towels and underwear were made using this fabric, and strenuous work was carried out at a temperature of 33°C and humidity of 80% in a special temperature-controlled room.

[0068] Sweat generated during this work was quickly absorbed by the water-absorbing fabric made of ultrafine false-twisted yarn on the surface, and the feeling of comfort on the skin was extremely good. Furthermore, when I moved on to light work after intense work, my underwear got wet with sweat, so I didn't feel as cold or sticky.

Table 2 shows the test results of this example, and for comparison, the test results of a fabric made of 100% cotton fiber and 100% ordinary polyester processed yarn are shown.

[0070]

[Table 1]

[0071]

[Table 2] Water retention rate * (1), water absorption rate (2), (
3), The degree of stickiness (4) is measured as follows. (1) Water retention measurement method: A sample obtained by drying a fabric is immersed in water for 30 minutes or more, and then dehydrated for 5 minutes in a dehydrator of a household electric washing machine. It was calculated from the weight of the dry sample and the weight of the sample after dehydration using the following formula. Water retention rate = (sample weight after dehydration) - (dry sample weight) / (dry sample weight) (%) (
2) Water absorption rate test method (according to JIS-L1018) Test fabric (sample) was washed with anionic detergent Zabu (manufactured by Kao Soap Co., Ltd.)
Wash the sample with a 0.3% aqueous solution of
．． 04cc) and measure the time until the water is completely absorbed by the sample and no reflected light is observed. (3) Byrek method (according to JIS-L1018B) One end of the fabric is immersed in water (width 2.5 cm) and the water absorbency is measured by the height of the water sucked up after 10 minutes. (4) Stickiness degree The resistance (coefficient of dynamic friction) when a water-retaining fabric is slid over cowhide is measured and evaluated as stickiness degree.

[0072]

Effects of the Invention: The ultra-fine false twisted yarn containing a micropore-forming agent of the present invention is made of 100% polyester and is lower in cost than the conventional conjugate method (nylon blend), and has no yellowing feel compared to nylon. It has no slimy feel, has a calm natural luster, and has excellent water absorption properties.

[0073] After the micropore-forming agent is removed, light absorption permeates into the system, resulting in a more natural-looking and subdued gloss effect. Therefore, towel-like underwear that requires more flexibility and especially water absorption,
It is an extremely suitable material for clothing fabrics such as dry towels that have a good dry feel.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a cross section of a false twisted yarn.

FIG. 2 is a schematic diagram showing the manufacturing process of false twisted yarn.

[Explanation of symbols]

L1 Long axis L2 in cross-sectional view Short axis 1 in cross-sectional view Highly oriented polyester undrawn yarn 2 Feed roller 3 Air injection nozzle for entangling 4 First delivery roller 5 First heater 6 Cooling plate 7 False twisting device 8 Second delivery belly roller

Claims (2)

[Claims] [Claim 1] The following general formula [I] [Formula, W is a hydrogen atom or an ester-forming functional group, M2
and M3 represents a metal, and n represents an integer of 1 or 2. ] A sulfonate compound shown as a micropore-forming agent is blended as a micropore-forming agent, the false twisted yarn is made of polyester multifilament with a single filament fineness of 0.7 denier or less, and has an average cross-sectional Hempey coefficient (S) of 2. 0 to 3.0, the cross-sectional Hempey coefficient distribution ratio (γ) is 1.3 or more, and the total crimp ratio (T
．． An ultra-fine false twisted yarn characterized in that C) is 5 to 12%. However, the cross-sectional Hempey coefficient (S) and the cross-sectional Hempey coefficient distribution ratio (γ) comply with the following definitions. Cross-sectional Hempey coefficient (S) = L1 /L2 Here, L1 is the length of the longest part (long axis) in the cross section of a single fiber, L2
is the maximum width perpendicular to the long axis in the cross section of a single fiber. Cross-sectional Hempey coefficient distribution ratio (γ) = γ1 / γ2 Here, γ1 is the 75th single yarn counting from the one with the smallest Henpey coefficient when the total number of single yarns constituting the above-mentioned ultra-fine false twisted yarn is 100. The Henpey coefficient, γ2, is the Henpey coefficient of the 25th single yarn counting from the one with the smallest Henpey coefficient, when the total number of single yarns constituting the above-mentioned water-absorbent extra-fine false twisted yarn is 100. [Claim 2] 50% of the extra-fine false twisted yarn according to Claim 1
A water-absorbing fabric obtained by treating a fabric containing at least % by weight with an alkali to remove the micropore-forming agent contained in the processed yarn.