JP2002038341A - Ultrafine false twist textured yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ultrafine false twist textured yarn having an improved depth and brightness of color, excellent in water absorptivity and a touch feeling and a calm and natural gloss when formed into a fabric. SOLUTION: This ultrafine false twist textured yarn comprises a micropore- forming agent-containing polyester prepared by adding a metal-containing phosphorus compound (the general formula) (R1 and R2 are each a monovalent organic group and R1 and R2 may be the same or different; M is an alkali metal or an alkaline earth metal; and m is 1 when M is the alkali metal and 1/2 when M is the alkaline earth metal) in an amount of 0.5-3 mol% based on an acid component and an alkaline earth metal compound in a molar amount of 0.5-1.2 times based on the metal-containing phosphorus compound when synthesizing the polyester and has <=0.6 dtex single filament fineness, 1.2-2.5 average cross section flatness coefficient, 170-230 deg.C thermal stress peak temperature and 0.17-0.44 cN/dtex value of the thermal stress peak.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an ultrafine false twisted yarn and a method for producing the same. For more information,
Special fine pores are formed by alkali reduction treatment, and when colored, exhibit improved color depth and sharpness,
Further, the present invention relates to an ultrafine false-twisted yarn which is excellent in water absorbency and feeling when made into a fabric, and which exhibits a natural luster that is settled down, and a method for producing the same.

[0002]

2. Description of the Related Art Polyester processed yarn obtained by false twisting is rich in bulkiness and good in elongation and elongation properties. Therefore, it has been favorably used for clothing because of its easy-care property and dry feeling. However, conventional polyester yarn is
Compared with natural fibers such as wool or silk, rayon, acetate, acrylic, etc., the color when colored has no depth,
There was a disadvantage that the sharpness was poor.

[0003] On the other hand, in recent years, ultra-fine processed yarns have attracted attention because of their excellent water absorbency and feeling. Usually, when the fineness of a single yarn becomes extremely fine (especially, 0.6 dtex or less), high multi-filament yarns are used. Since the contact area increases as the count increases, the dye absorption decreases, and the dye becomes lightly dyed. Therefore, it is required to improve the color depth and clarity when colored.

[0004] Further, although the ultra-fine processed yarn has improved water absorption, when the material of the processed yarn is polyester, the material itself has low water absorption, so that it is used in clothing applications that come into direct contact with the skin. However, there is a problem that the expansion of applications is limited due to insufficient comfort.

As a method of solving such a problem, Japanese Patent Application Laid-Open No. 54-151617 proposes a method in which micropores are formed on the fiber surface and concave portions are formed in the cross section of the fiber. Although water absorption is improved, the color depth and clarity are still insufficient, and the texture of the obtained fabric is not satisfactory, and an ultrafine false twisted yarn satisfying these characteristics at the same time is still proposed. The fact is that it has not been done.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and has as its object to exhibit improved color depth and clarity, and furthermore, to give a fabric with water absorption. An object of the present invention is to provide an ultrafine false-twisted yarn which is excellent in texture and feel and has a natural luster that is settled down, and a method for producing the same.

[0007]

According to the study of the present inventors, the object of the present invention is to provide a compound represented by the following general formula: Polyester containing a fine pore-forming agent obtained by adding a metal-containing phosphorus compound represented by the following formula (2) and an alkaline earth metal compound in an amount of 0.5 to 1.2 times mol based on the metal-containing phosphorus compound. , The single fiber fineness is 0.6 dtex or less, the average cross-sectional flatness coefficient is 1.2 to 2.5, the thermal stress peak temperature is 170 to 230 ° C, and the thermal stress peak value is 0.
An ultrafine false-twisted yarn having a thickness of 17 to 0.44 cN / dtex. It has been found that this can be achieved.

[0008]

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Wherein R ¹ and R ² are monovalent organic groups, R ¹ and R ² may be the same or different, M is an alkali metal or an alkaline earth metal, and m Is 1 when M is an alkali metal, and １ ／ when M is an alkaline earth metal.)

[0010] The ultrafine false-twisted yarn is a non-oriented polyester multi-filament having a birefringence of 0.04 to 0.08 and comprising a polyester containing the fine pore-forming agent. When using a false twisting machine in which the heat set heater is a non-contact type, when the single yarn fineness is reduced to 0.6 dtex or less, the false twist heat setting temperature is 200 to
A method for producing an ultrafine false-twisted yarn, comprising simultaneously performing drawing and false-twisting at 400 ° C. and a heat setting time of 0.05 to 0.10 seconds. ”To be easily obtained.

[0011]

Embodiments of the present invention will be described below in detail. The polyester referred to in the present invention comprises terephthalic acid as a main acid component, and at least one alkylene glycol, preferably ethylene glycol, trimethylene glycol, at least one alkylene glycol selected from tetramethylene glycol as a main glycol component. The main object is polyalkylene terephthalate, and among them, polyethylene terephthalate is preferred. Such a polyester may contain a conventionally known copolymer component within a range not to impair the object of the present invention, preferably 10 mol% or less, more preferably 5 mol% or less, for example, isophthalic acid. , Naphthalene dicarboxylic acid, β-hydroxyethoxybenzoic acid, p
Bifunctional carboxylic acids such as -oxybenzoic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid and diol compounds such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S; Examples can be given. Further, a polyoxyalkylene glycol may be copolymerized.

The polyester may be synthesized by any method. For example, when describing polyethylene terephthalate, usually, terephthalic acid and ethylene glycol are directly subjected to an esterification reaction, a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is subjected to a transesterification reaction with ethylene glycol, or terephthalic acid. A first-stage reaction in which a glycol ester of terephthalic acid and / or a low polymer thereof is produced by reacting with ethylene oxide, and a product obtained in the first stage is pressurized under reduced pressure to obtain a desired degree of polymerization. It is produced by a second stage reaction of polycondensation reaction.

The polyester containing a micropore-forming agent of the present invention is obtained by adding a metal-containing phosphorus compound and an alkaline earth metal compound represented by the following general formula (Chemical Formula 3) during the synthesis of the above polyester. It is.

[0014]

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In the formula, R ¹ and R ² are a monovalent organic group, and the monovalent organic group is specifically an alkyl group, an aryl group, an aralkyl group or — [(CH ₂ ) _l O] _k R ³ (however,
R ³ is preferably a hydrogen atom, an alkyl group, an aryl group or an aralkyl group, l is an integer of 2 or more, k is an integer of 1 or more) and the like, and R ¹ and R ² may be the same or different. M is an alkali metal or alkaline earth metal, Li, Na,
K, Mg, Ca, Sr, and Ba are preferable, and in particular, Ca, S
r and Ba are preferred. m is l when M is an alkali metal
And 1/2 when M is an alkaline earth metal.

When a phosphorus compound in which R ¹ and / or R ² is replaced with a metal (particularly an alkali metal or an alkaline earth metal) is used instead of the above metal-containing phosphorus compound, the obtained processed yarn is reduced in alkali. Even after the treatment, the fine pores formed on the fiber surface become large, so that the intended sharpening effect cannot be obtained, and the fibril resistance also becomes poor.

The alkaline earth metal compound used in combination with the metal-containing phosphorus compound is not particularly limited as long as it reacts with the metal-containing phosphorus compound to form a salt insoluble in polyester. Acetate, oxalic acid,
Organic carboxylate such as benzoate, phthalate, stearate, inorganic acid salt such as borate, silicate, carbonate, bicarbonate, halide such as chloride, ethylenediaminetetraacetic acid complex salt Chelating compounds, hydroxides, such as
Examples include oxides, alcoholates such as methylates, ethylates, glycolates and the like, phenolates and the like.
Particularly preferred are organic carboxylate salts, halides, chelate compounds and alcoholates which are soluble in ethylene glycol, and particularly preferred are organic carboxylate salts.

If the amounts of the above-mentioned metal-containing phosphorus compound and alkalinity metal compound are small, the color depth and the like are not improved. Since the durability also decreases, the content of the metal-containing phosphorus compound should be in the range of 0.5 to 3.0 mol%, particularly in the range of 0.6 to 2.0 mol%, based on the total acid components of the polyester. preferable. On the other hand, the amount of the alkaline earth metal compound to be added should be in the range of 0.5 to 1.2 times mol, preferably 0.5 to 1.0 times mol, of the metal-containing phosphorus compound. . By doing so, it becomes possible to generate insoluble particles in the state of uniform ultrafine particles in the polyester, which has a good thread-forming process and a false-twisting process, and finally has a color depth and It is possible to obtain a processed yarn having excellent sharpness.

The false twisted yarn of the present invention is made of a polyester containing the above-mentioned fine pore-forming agent, and has a single-fiber fineness of 0.6 dtex or less, preferably 0.2 to 1.0 dtex.
It must be in the range of 0.5 dtex. If the single-fiber fineness exceeds 0.6 dtex, the texture of the fabric becomes not only coarse and hard, but also the water absorption is unfavorably reduced. The number of filaments of the processed yarn is 120 to 3
A range of 00 filaments is suitable.

Next, in order to give the ultrafine false twisted yarn of the present invention a soft feel, good water absorbency, and a natural luster that is settled, the average cross-sectional flatness coefficient is 1.2 to 2.5. , Especially 1.5 to 2.0. The section flatness coefficient here is a value calculated from the enlarged photograph of the cross section of the multifilament for each filament based on the following equation, and is a random value of at least 15%.
The measurement was performed at 0 places to obtain an average value. Sectional flatness coefficient = L ₁ / L ₂ where L ₁ is the length (long axis) of the longest part in the cross section of the single fiber, and L ₂ is the maximum width orthogonal to the long axis in the cross section of the single fiber. .

Here, L ₁ and L ₂ will be described with reference to a specific example of a fiber cross section shown in FIG. Draw a line fiber cross section in the longest portion of FIG. 1, and the length and major axis L _1, then examine the maximum width portion measured perpendicular to the long axis L _1, which is referred to as L _2.

This cross-sectional flatness coefficient is an important factor for the gloss effect, water absorption performance and water retention effect in the case of a woven or knitted fabric.
When the cross-sectional flatness coefficient exceeds 2.5, not only the difference in gloss becomes so strong that the glossiness (glitter) is excessively emphasized, but also the fluff is liable to be generated at the time of false twisting. This is not preferred because the yield decreases and the feeling deteriorates.

On the other hand, when the cross-sectional flatness coefficient is less than 1.2, not only the feeling becomes the filament touch, but also the diffused light reflection on the filament increases, so that a calm natural gloss cannot be obtained. Furthermore, the inter-fiber voids of the processed yarn are reduced, so that the water absorption performance cannot be sufficiently exhibited.In other words, it becomes difficult to retain water in the fine gap between fibers, and stable water absorption performance is obtained. No longer available.

It is considered that the feeling of discomfort to the skin is mainly attributable to the large contact area of the thread with the skin. In the case of the formed fiber, the surface of the thread that touches the skin is increased because the surface of the skin is wetted instead, and a sticky feeling is given. On the other hand, the ultrafine false twisted yarn made of polyester having inferior hydrophilicity as in the present invention has a water absorbing property because the yarn surface is hydrophobic even if it has water absorbency, and the moisture on the skin surface is reduced. In addition, the contacting yarn is an ultrafine fiber, so that the yarn feels dry and gives a soft texture.

Next, the ultrafine false twisted yarn of the present invention has a thermal stress peak temperature of 170 in addition to the above-mentioned requirements in order to further improve the water absorption and feeling when made into a fabric. It is important that the temperature is in the range of up to 230 ° C. and the peak value is in the range of 0.17 to 0.44 cN / dtex. When the thermal stress peak temperature is lower than 170 ° C. or when the thermal stress peak stress exceeds 0.44 cN / dtex, the yarn is likely to be rounded, so that the texture touch becomes filament-like, which is not preferable. On the other hand, when the thermal stress peak temperature exceeds 230 ° C. or when the thermal stress peak stress is less than 0.17 cN / dtex, the filament-constituting filaments are fused and hardened, and the bulk is increased. It is not preferable because the feeling is insufficient and the texture becomes rough.

The ultra-fine false twisted yarn of the present invention preferably has a total crimp rate (TC) in the range of 3 to 10% from the viewpoint of feeling and water absorption performance. T. When C is less than 3%, even if the texture is soft, the volume (bulging) is reduced, the bulkiness of a woven or knitted product is reduced, and the water absorption performance tends to be reduced. . On the other hand, T. When C exceeds 10%, the volume feeling (bulging feeling) is good, but the feeling of touch exhibits a rough and rough feeling, and the soft feeling of the skin in the case of a woven or knitted product is reduced, and the water absorbing property is obtained. Also tend to decrease.

The ultrafine false twisted yarn of the present invention described in detail above can be produced, for example, by the method described below. That is, the polyester containing the above-described micropore-forming agent is melt-spun according to a conventional method, and has a birefringence of 0.0
A highly oriented undrawn multifilament having a range of 4 to 0.08 is used. The single yarn fineness of the filament is set so that the single yarn fineness after false twisting is 0.6 dtex or less. Therefore, in the case of drawing false twisting, an undrawn yarn having a single yarn fineness taking into account the draw ratio is used. In addition, when melt-spinning the undrawn filament having a single fiber fineness of 0.7 dtex or less, it is preferable to use a melt-spinning device having a rectifying device proposed in JP-A-2000-34615. . The spinning speed (take-off speed) at this time is
A range of 2500 to 4000 m / min is appropriate.

When the birefringence is less than 0.04, the yarn is liable to be embrittled in false twisting, so that yarn breakage is apt to occur frequently, and the obtained processed yarn also has a large section flatness coefficient. In addition, the distribution of the cross-sectional flattening coefficient is undesirably large. On the other hand, if the birefringence exceeds 0.08, fluff is apt to occur frequently in the false twisting process, and the quality of the woven fabric is lowered, so that the desired calm gloss and water absorption performance cannot be obtained, which is not preferable.

Next, the non-stretched highly oriented polyester multifilament thus obtained is stretched and false-twisted by, for example, the process shown in FIG.
ex or less. At that time, as the false twisting machine, a non-contact type false twist heat set heater is used, the false twist heat setting temperature is 200 to 400 ° C., and the false twist setting time is 0.05 to 0. Simultaneous stretching and false twisting under the condition of 10 seconds is necessary for simultaneously satisfying the requirement of the flat section modulus and the requirement of the thermal stress peak.

As the false twisting machine in which the false twist heat set heater used is a non-contact type, any conventionally known false twisting machine can be used. For example, a stretching type of the type proposed in Japanese Patent No. 2856260 can be used. A simultaneous false twisting machine can be exemplified.

When the heat setting temperature of the false twist is lower than 200 ° C., the crimping becomes insufficient due to insufficient heat setting, so that the processed yarn obtained is equivalent to a flat yarn and the bulkiness is reduced. It is not preferable because the feeling is worsened. On the other hand, if the heat setting temperature of the false twist is too high and exceeds 400 ° C., fusion will partially occur, giving a rough feel to the touch and softness in the case of a woven or knitted product. It is not preferable because it lacks the feeling of skin and also reduces water absorption.

Next, the heat setting time of the false twist is in the range of 0.05 to 0.10 seconds, preferably 0.06 to 0.10 seconds as described above.
When the heat setting time is less than 0.05 seconds, sufficient crimp cannot be provided, and the strength of the obtained false twisted yarn also decreases. It is not preferable because the desired soft feeling cannot be obtained. Furthermore, when the false twisting speed is set to a high speed of 1200 m / min or more, a problem that surging is likely to occur and staining spots increase is likely to occur. On the other hand, when the heat setting time exceeds 0.10 seconds, not only the dyeability is reduced (lightly dyed) but also the spots are easily generated due to the heat set over, so that the heat setting time is obtained. It is not preferable because the quality of the processed yarn is reduced.

The false twisting tool of the simultaneous drawing and twisting machine used in the present invention is not particularly limited, but the friction disk has a hardness of 75 to 90 degrees, preferably 80 to 85 degrees. A triaxial friction false twist type disk false twisting device composed of a urethane disk having a thickness of 7 to 12 mm, preferably 8 to 11 mm is preferable, in which case the running angle of the yarn is 35 to 45 with respect to the rotation axis of the disk. It is preferable to be within the range of degrees.

When the material of the friction disk of the triaxial friction false twist type disk false twisting device is urethane, the polyester unstretched multifilament on the low orientation side is particularly excellent in twistability, and the obtained processed yarn has high elongation. It is possible to suppress the decrease in the degree and the generation of fluff.

When the hardness of the friction disk is out of the above range and is about 95 degrees, when the ultrafine spun highly oriented polyester undrawn multifilament is drawn false twisted at a high speed of 700 m / min, Since the multifilament is twisted and stretched at a high speed while being false-twisted, not only the ultrafine false-twisted yarn is easily damaged and fuzzed, but also has a force for grasping the running yarn. As a result, slipping is likely to occur between the running yarn and the friction disk, so that the twisting efficiency is reduced and it becomes difficult to provide sufficient crimp. On the other hand, if the hardness of the friction disk is too low and less than 75 degrees, the force for grasping the running yarn increases, but the wear of the friction disk becomes severe and the service life is shortened. Thread breakage is also likely to occur. Note that the hardness of the friction disk mentioned here is JIS K6301.
It was measured by the method of -1971.

Next, the thickness of the friction disk is related to the running angle of the yarn, but when the thickness is 7 mm or more, the twisting force is slightly reduced but the yarn feeding force is increased. Therefore, even when the false twisting speed is as high as 700 m / min or more, it is possible to perform stable processing. However, if the friction disk is too thick and exceeds 12 mm, the untwisting tension becomes too low, so that thread breakage and fuzz are liable to occur, and the threading property becomes difficult. The number of friction disks is not particularly limited, but usually a range of 4 to 9 disks is employed.

Next, when twisting using the triaxial friction false twist type disk false twisting tool, the running angle of the yarn with respect to the disk rotation axis is suitably in the range of 35 to 45 degrees. In addition,
Here, the running angle means an angle θ formed between the disk rotating shaft and the yarn running in contact with the outer periphery of the friction disk.

In the friction false twisting, the rotation of the friction disk generates a twisting force for giving a twist to the running yarn and a yarn feeding force for giving a yarn feeding effect to the running yarn. The twisting force is important for imparting sufficient crimp performance to the running yarn, while the yarn feeding force is important for processing at high speed. Normally, the running state of the yarn tends to become unstable as the false twisting speed increases, and a method is adopted to stabilize the running state by increasing the twisting tension (tension on the entry side to the friction disk). However, since the untwisting tension (tension on the exit side from the friction disk) increases with this, yarn breakage and fluff are likely to occur. This tendency is particularly prominent when draw-twisting the ultra-fine spun highly oriented polyester undrawn multifilament as in the present invention, and the problem of wear of the friction disk comes to be concerned. .

Therefore, in the present invention, as described above, the running angle θ of the yarn is 35 to 45 degrees, preferably 38 to 4 degrees.
By selecting within the range of 2 degrees, it is possible to increase the yarn feeding action and reduce the untwisting tension without lowering the crimping performance of the processed yarn, and to reduce the untwisting tension to 700 m / min or more, particularly 800 to 800 m / min.
Processing at a high speed such as 1200 m / min becomes possible.
If the running angle θ is less than 35 degrees, the twisting force increases, but the yarn feeding force decreases, and it becomes difficult to perform high-speed false twisting. On the other hand, when the running angle θ exceeds 45 degrees, the yarn feeding force increases, but the twisting force decreases, and the crimping performance and strong elongation characteristics of the processed yarn decrease. Occurrence is likely to increase.

In order to set the running angle within the range of 35 to 45 degrees, the diameter and thickness of the friction disks and the intervals between the friction disks may be appropriately adjusted. The running angle θ is preferably set so as to be within the above range for all friction disks, and for this purpose, for example, it is preferable to use a guide disk. FIG. 3 shows an example of a preferably used triaxial friction false twist type disk false twisting tool, but the number and arrangement of the guide disks are not limited to those shown in the figure.

Further, when the ultrafine-spun highly oriented polyester undrawn multifilament is drawn at a high speed of 700 m / min or more, the number of false twists T (t / m) is 27.
000 / D ^1/2 ≦ T ≦ 36000 / D ^1/2 (D: total fineness (dtex) of the processed yarn). When the number of false twists T (t / m) is less than 27000 / D1 / ² , the obtained polyester processed yarn not only has reduced crimpability and bulkiness but also has the desired cross-sectional flatness coefficient. It becomes difficult. On the other hand, the number of false twists T (t / m) is 36000 / D
If it exceeds ^1/2 , fluff is likely to occur during the stretch false twisting process.

In the present invention, it is appropriate that the false twist twisting tension is in the range of 0.35 to 0.71 cN / dtex. When the twisting tension is less than the above range, spotting due to surging tends to occur, and when the twisting tension exceeds the range, fluff and yarn breakage tend to occur. When the untwisting tension is too low, dyeing spots (spot untwisted shape) are likely to occur, while when it is too high, fluff is apt to occur frequently, so it should be in the range of 0.26 to 0.62 cN / dtex. Is preferred.

Next, FIG. 2 is a schematic process drawing showing one embodiment of the manufacturing method of the present invention. In FIG.
The highly oriented polyester undrawn multifilament which has been spun extra finely in advance is supplied to a draw simultaneous twisting region by a feed roller 3 via a guide 2. Next, the sheet is twisted and untwisted by a friction disk while being stretched between the feed roller 3 and the first delivery roller 7, and is heated by a first false twist heat set heater (non-contact heat set heater) 4. Fixed. The false-twisted yarn is heat-set by a second heat set heater (reheat set heater) 8 between the first delivery roller 7 and the second delivery roller 9 as necessary, and then wound. Roller 1
At 0, it is wound up as a package 11.

[0044]

The present invention will be described more specifically with reference to the following examples. In the examples, measurement of each characteristic value was performed as follows.

<Birefringence Index> Using a Olympus BH-2 polarizing microscope, a conventional method for measuring the retardation and the diameter of a single yarn by a compensator method was used.

<Thermal Stress> A skein-shaped sample was subjected to an initial load of 0.029 cN / dtex using a Kanebo Engineering thermal stress meter (type KE-11).
The temperature was raised at a rate of 2.3 ° C./min, the generated stress was recorded on a chart, and the thermal stress peak temperature and the thermal stress peak value were determined. Note that the thermal stress value is obtained by dividing the stress (cN) read from the chart by the fineness (dtex) (cN / dte).
x).

<Spinning Process Condition> The following judgment was made based on the percentage of the yarn that could not be completely wound due to the breaking when the yarn was wound at a winding amount of 7 kg. ：: spinning breakage rate of less than 5%, Δ: spinning breakage rate of 5% or more and less than 10%, ×: spinning breakage rate of 10% or more,

<Total crimp rate (TC)> A tension of 0.044 cN / dtex (50 mg / denier) is applied to the ultrafine false twisted yarn and wound around a skein frame to make a skein of about 3300 dtex. After making the case, 0.00177c at one end of the case
A load of N / dtex + 0.177 cN / dtex (2 mg / denier + 200 mg / denier) is applied, and the length L0 (cm) after 1 minute is measured. Then, 0.
In a state where the load of 177 cN / dtex (200 mg / denier) is removed, treatment is performed in boiling water at 100 ° C. for 20 minutes. 0.00177 cN / dtex (2 m
g / denier), and air-dry in a free state for 24 hours. 0.0017 again to the naturally dried sample
7 cN / dtex + 0.177 cN / dtex (2 mg
/ Denier + 200mg / denier)
The length L1 (cm) after one minute has elapsed is measured. Then
The load of 0.177 cN / dtex (200 mg / denier) was removed, the length L2 after 1 minute was measured, and the crimp rate was calculated by the following formula. This measurement was performed 10 times, and the result was represented by the average value. TC (%) = [(L1−L2) / L0] × 100

<Knitted texture of ultrafine false twisted yarn> The texture of the knitted fabric after knitting the obtained ultrafine false twisted yarn with a tubular knitting machine, scouring, dyeing and final setting according to a conventional method ( The soft feeling) and the surface touch were comprehensively evaluated sensory by five skilled persons and expressed in three stages as described below. First grade (poor), second grade (good), third grade (very good)

<Textile texture of ultra-fine false twisted yarn> Fabric texture (soft feeling, irritability, gloss, natural feeling) and surface after weaving a plain woven fabric, scouring, dyeing, and final setting according to a conventional method The touches were comprehensively evaluated by sensory evaluation by five skilled persons, and expressed in four stages as follows. × (no good), △ (poor), ○ (good), ◎ (very good)

<Water absorption performance Bylex method> JIS-L1
018B, immerse one end of the fabric in water (width 2.5c
m) The height of the water sucked up after 10 minutes was measured.

<Largeness> Extra fine false twisted yarn sample 180
cm into a skein (perimeter 90 cm) shape, 5.88 cN
After drying at 180 ° C. for 5 minutes under a load of (6.0 g), the processed yarn is loosened to remove entanglement due to shrinkage between the yarns, and then the sample is inserted into the groove 12 of the measuring device shown in FIG. Then, the plate weight 13 is placed, the scale 14 is read, and the volume (Vcm ³ ) of the sample is measured. In addition,
The length of the groove 12 of the measuring device is 12 cm and the width is 0.9 cm. Next, both ends of the sample were cut off along the 12 side surfaces, the sample weight W (g) after the cut off was measured, and V / W (cm ³ ) was regarded as bulkiness.

<Processed Fluff> Using a DT-104 type fluff counter device manufactured by Toray Industries, Inc., 500 extra fine false twisted processed yarn was obtained.
The number of fluffs generated was counted by continuously measuring at a speed of m / min for 20 minutes.

<Boiled water shrinkage (BWS)> about 3300 dt
ex.
The original length L0 (cm) was measured by applying a load of cN / dtex (0.1 g / denier).
177 cN / dtex (2 mg / denier), heat-treated with boiling water for 30 minutes, and then dried at room temperature. Then, the load was changed to 0.088 cN / dtex (0.1 g / denier) and the length L1 ( cm) was measured, and the boiling water shrinkage was calculated by the following formula, and measured 10 times to obtain the average value. Boiling water shrinkage (BWS) = (L0−L1) / L0 × 100

<Running Angle> Photographs of the yarn running on the friction false twisting tool were taken, the running angle θ of the yarn on each friction disk was actually measured on the photograph, and the average of the measured values was obtained. The value was used as the running angle.

<Friction disk life> The life of the friction disk at the lowermost stage (excluding the guide disk provided for stabilizing the running angle) is represented by the number of months in which the diameter has decreased by 1.0%.

<Color Depth> As a scale indicating the color depth, a deep chromaticity (K / S) was used. This value was obtained by measuring the spectral reflectance (R) of the sample cloth with a Shimadzu RC-330 type recording spectrophotometer, and the following Kubelk (Kubelk).
a Munk). The larger this value is, the larger the deep color effect is. K / S = (1−R) ² / 2R where K indicates an absorption coefficient and S indicates a scattering coefficient.

<Friction discoloration resistance> Using a Gakushin type flat abrasion machine for friction fastness test, using a georgette made of 100% polyethylene terephthalate as a friction cloth, the test cloth was subjected to a load of 490 cN (500 g). The surface was worn a predetermined number of times, and the degree of discoloration was determined using a gray scale for discolored brown. The case where the abrasion resistance was extremely low was defined as Class 1, and the case where it was extremely high was defined as Class 5. Practical grade 4 or higher is required for practical use.

[Example 1] Dimethyl terephthalate 100
Parts, ethylene glycol 60 parts, calcium acetate monohydrate 0.06 parts (0.066 parts based on dimethyl terephthalate)
Mol%) in a transesterification vessel, and the temperature was raised from 140 ° C. to 230 ° C. over 4 hours in a nitrogen gas atmosphere to carry out a transesterification reaction while distilling off the generated methanol out of the system. Subsequently, 0.5 part of trimethyl phosphate (0.6% based on dimethyl terephthalate) was added to the obtained reaction product.
93 mol%) and 0.31 part of calcium acetate monohydrate (１ ／ mole relative to trimethyl phosphate) in 8.5 parts of ethylene glycol at a temperature of 120 ° C. under total reflux for 60 minutes. To 9.31 parts of a transparent solution of calcium phosphate diester prepared by the reaction, 0.57 parts of calcium acetate monohydrate (0.3% based on trimethyl phosphate) was added at room temperature.
(9 times mol) was dissolved, and 9.88 parts of a mixed transparent solution of calcium phosphate diester and calcium acetate obtained by dissolving the mixture were added. Then, 0.04 part of antimony trioxide was added, and the mixture was transferred to a polymerization vessel. Then, 101 kPa (7
The pressure was reduced from 60 mmHg) to 133 Pa (1 mmHg), and the temperature was simultaneously raised from 230 ° C to 285 ° C over 1 hour and 30 minutes. Under a reduced pressure of 133 Pa (1 mmHg) or less,
Polymerization was further performed at a polymerization temperature of 285 ° C. for 3 hours for a total of 4 hours and 30 minutes to obtain a polymer having an intrinsic viscosity of 0.641 and a softening point of 259 ° C. After completion of the reaction, the polymer was formed into chips according to a conventional method.

The chip is dried by a conventional method,
Using a spinneret having 72 circular discharge holes with a hole diameter of 0.15 mmφ, it is melted at a maximum of 305 ° C. and spun at a spinning speed of 3000 m / min, and spun at 58 dtex / 144 filaments and single yarn fineness 0.40 dtex. Thus, an ultrafine yarn having a birefringence of 0.055 was obtained. The intrinsic viscosity [ηF] of the obtained spun yarn was 0.625. At that time, the spinning condition is
There was no problem.

The obtained yarn was subjected to draw false twisting in the step shown in FIG. At that time, the draw ratio was 1.60, the temperature of the non-contact type false twist heat set heater was 300 ° C., the heat treatment time was 0.075 seconds (heater length 1 m), and the triaxial friction disk (the material of the friction disk) was used as the false twisting tool. Is a urethane rubber having a hardness of 83 degrees, a thickness of 10 mm, and a running angle with the yarn of 40.
) At a speed of 800 m / min.
tex / 144 filament (single yarn fineness 0.25 dte
x) An extra fine false twisted yarn was obtained.

The physical properties of the obtained processed yarn are as follows: strength 3.80 c
N / dtex (4.3 g / de), silk factor 2
At 1.0, there was no fluff of the processed yarn and the level was good.
The cross-sectional flatness coefficient is 2.05 and the thermal stress peak temperature is 2
00 ° C., the peak stress value is 0.31 cN / dtex
(0.35 g / de). Table 1 shows other evaluation results such as the total crimp ratio (TC).

The obtained extra fine false twisted yarn is knitted into a tubular knit,
The knitted fabric dyed and finished according to a conventional method had a soft surface touch, and had a very soft feeling.

Further, using this extra fine false twisted yarn, 10 yarns are combined and the warp × weft is 80 / 2.54 cm × 80 /
A plain weave with a density of 2.54 cm was woven. 80
℃ × 20 minutes relaxing scouring, preset 180 ℃ ×
After performing the treatment for 45 seconds and reducing the amount of alkali by the ratios shown in Table 2, a final dyeing process (temperature: 160 ° C., 45 seconds) was performed through a usual dyeing process (temperature: 130 ° C., 45 minutes). Table 2 shows the results of the evaluation of the color depth and the rub discoloration resistance of this fabric.

Also, using this cloth, towels and underwear were made, and intense work was performed in a special temperature control room at a temperature of 33 ° C. and a humidity of 80%. The sweat generated in this operation was quickly absorbed by the water-absorbing fabric by the ultrafine false twisted yarn on the surface, and the sensitivity to the skin was extremely good. Also, after intense work, when you move on to mild work, your underwear gets wet with sweat,
There was almost no feeling of cold and stickiness.

[Example 2, Comparative Examples 1 to 6] In Example 1, the temperature of the false twist heat set heater and the draw ratio of the stretch false twist were changed as shown in Table 1, and at this time, the yarn to be subjected to false twist processing Single yarn fineness after false twisting is 0.25 dte
An ultrafine false twisted yarn was obtained in the same manner as in Example 1 except that the value was adjusted to be x. Table 1 summarizes the evaluation results of the obtained processed yarns.

[0067]

[Table 1]

[0068]

[Table 2]

[Examples 3 and 4, Comparative Examples 7 and 9] Example 1
In Example 1, an ultrafine false twisted yarn was obtained in the same manner as in Example 1 except that the specifications of the heat set heater, the heat set temperature, and the heat set time were changed as shown in Table 3. Table 3 summarizes the evaluation results of the obtained processed yarns.

[0070]

[Table 3]

[Examples 5 to 9] An extra fine false twisted yarn was obtained in the same manner as in Example 1 except that the hardness and thickness of the disk and the running angle were changed as shown in Table 4. Was. Table 4 summarizes the evaluation results of the obtained processed yarns.

[0072]

[Table 4]

[0073]

The ultra-fine false twisted yarn of the present invention described in detail above has a single yarn fineness, a cross-sectional flatness coefficient, a thermal stress peak temperature, and a stress value within a specific range, so that the calm natural gloss, It has a soft feel and a soft touch, and is also excellent in water absorption with less discomfort due to sweating.
Moreover, since the extra fine false twisted yarn contains a specific fine pore forming agent, it is possible to form fine pores on the fiber surface by treating with an alkaline solution. Products exhibit improved color depth and clarity when dyed, and can absorb sweat more quickly when worn, while at the same time having a better feel.

Therefore, taking advantage of these characteristics, it can be suitably used as a material for inner clothing such as lingerie or baby clothing that directly touches the skin.

Further, according to the production method of the present invention, a non-contact type heater is used as a heat set heater for false twisting in the stretch false twisting process, wherein the heat set temperature and the heat set time are set to specific ranges. Therefore, an extremely fine false twisted yarn having the above characteristics can be produced very easily and with high productivity.

[Brief description of the drawings]

FIG. 1 is an explanatory view (cross-sectional view) of a cross-sectional flatness coefficient of an ultrafine false twisted yarn.

FIG. 2 is a schematic view showing an example of a production process of the ultrafine false twisted yarn of the present invention.

FIG. 3 is a front view showing an example of a triaxial friction false twist type disk false twist tool used in the present invention.

FIG. 4 is a schematic view of a bulkiness measuring device.

[Explanation of symbols]

L ₁ minor axis 1 polyester undrawn yarn 2 guide 3 feed rollers 4 first heat setting heater (non-contact heater) in the long axis L ₂ cross view in transverse view 5 cooling plate 6 twisting device (false twisting disc) 7 first Delivery roller 8 Second heat set heater (reheat set heater) 9 Second delivery roller 10 Winding roller 11 Package 12 Groove 13 Flat plate weight 14 Scale 15, 16, 17 Rotation axis 18, 19, 20, 25 Guide disc 21, 22, 23, 24 Friction disk 26, 27, 28, 29 Pulley 30 Drive belt 31-34 Timing belt

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadashi Kamino 77-77 Kitayoshida-cho, Matsuyama-shi, Ehime F-term in Teijin Limited Matsuyama Office (reference) 4L035 BB33 CC20 DD02 DD07 DD13 EE01 EE05 EE07 EE08 EE20 FF04 FF08 FF10 GG03 HH10 JJ15 JJ25 KK05 KK08 4L036 MA05 MA33 PA07 PA15 UA16

Claims (3)

[Claims] 1. A metal-containing phosphorus compound represented by the following general formula (1) in an amount of 0.5 to 3 mol% based on the total acid component of the polyester during synthesis of the polyester, and 0 to 3% by mole of the metal-containing phosphorus compound. It is made of a polyester containing a micropore-forming agent obtained by adding an alkaline earth metal compound in an amount of 0.5 to 1.2 times mol, and has a single fiber fineness of 0.6 dtex or less and an average cross-sectional flatness coefficient of 1.2 to 1.2. 2.5, thermal stress peak temperature is 1
70 to 230 ° C., and a thermal stress peak value of 0.17 to 0.1.
An ultrafine false-twisted yarn having a cN of 44 cN / dtex. Embedded image (Wherein R ¹ and R ² are monovalent organic groups, R ¹ and R ² may be the same or different, M is an alkali metal or alkaline earth metal, and m is M 1 in the case of an alkali metal, and 1/2 in the case where M is an alkaline earth metal.) 2. A false twisting machine, comprising: a non-contact type false twist heat set heater for a highly oriented polyester undrawn multifilament having a birefringence of 0.04 to 0.08, comprising the polyester according to claim 1. 0.6 dte single yarn fineness using
x or less, the false twist heat setting temperature is 200 to 400 ° C, and the false twist heat setting time is 0.05 to 0.
A method for producing an ultrafine false-twisted yarn, comprising performing simultaneous false-twisting under a condition of 10 seconds. 3. The false twisting tool of the false twisting machine has a hardness of 75 to 90.
Is a triaxial friction false twist type disk false twisting device composed of a urethane disk having a thickness of 7 to 12 mm, the running angle of the yarn with respect to the rotation axis of the disk is 35 to 45 degrees, and the running speed of the yarn is The method for producing an ultrafine false twisted yarn according to claim 2, which is at least 700 m / min.