JP2804075B2 - Manufacturing method of super soft special mixed fiber yarn with dry feeling and drapability - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention has an excellent dry feeling, drapability, and
The present invention relates to a method for producing a super soft special mixed yarn having extremely high flexibility and a unique feel.

(Prior art) Synthetic fiber yarns generally have a glass transition temperature (also referred to as a second transition temperature). Below this temperature, molecules are frozen and are difficult to move. It is common sense to make the temperature higher than the glass transition temperature to make the molecules easy to move and stretch. However, if the molecules below the glass transition temperature are frozen and stretched forcibly, the molecules will not be oriented, and a yarn with a unique feeling completely different from that of the drawn yarns will be produced. (Forcedly stretched in the state of being stretched, it will always be uneven stretching and cannot have a uniform appearance.) That is, stretching at a low temperature below the glass transition temperature is a method for producing a so-called thick & thin yarn itself, as disclosed in JP-A-58-44762. It is impossible to ask for. In addition, since other frozen molecules are forcibly stretched, the force required for the stretching is extremely large, and there are many problems such as slipping of the yarn with the roller and generation of wrapping due to fluffing. There is also a problem that performance is reduced.

Furthermore, the conventional polyester fiber woven or knitted fabric has a strong slimy feeling and lacks a dry feeling, and does not have an opacity like silk fabric in terms of transparency.

In order to solve such a problem, it has been attempted to use a fiber having a large denier or a fiber having a different cross-sectional shape.However, the texture becomes hard or a woven or knitted fabric having a rough surface touch is satisfactory. It is not possible to obtain a dry surface touch, and attempts have been made to increase the opacity by using Fuldaru yarn, but this yarn is made by adding titanium oxide. Therefore, the metal has a high property of abrading metal, which causes a machine used for the production of a woven or knitted product to wear, and as a result of the abrasion, the yarn is fuzzed and the yarn is damaged.

(Object of the Invention) An object of the present invention is to improve such a drawback of the polyester fiber, exhibit a cool and dry surface touch, and
An ultra-soft flat multifilament yarn with drapability, extremely high flexibility and a unique feel, without changing the cross-sectional shape of the multifilament while the polymer molecules are frozen, Provided is a method for producing without imparting crimp, thereby comprising a uniformly drawn multifilament,
Ultra soft flat multifilament yarn having uniform appearance and performance, and ultra soft flat yarn obtained therefrom
It is intended to provide a flat multifilament yarn fabric.

(Constitution of the Invention) That is, the present invention provides a method for preparing at least one type of multifilament yarn by aligning two or more polyester multifilament yarns having a difference in cutting elongation of at least 70% and performing false twisting. As a filament yarn, false twisting is performed using a polyester multifilament yarn blended with the following micropore-forming agent, setting is performed at room temperature or at most 78 ° C during false twisting, then untwisting, and immediately after untwisting Or a heat treatment at a temperature of 130 ° C. or more in a subsequent step, which is a method for producing a super soft special mixed yarn exhibiting dry feeling and drape property.

Microporous agent RSO ₃ M… [II] The present invention will be described in detail with reference to specific examples.

FIG. 1A is a schematic view of a so-called undrawn yarn of a synthetic fiber. This is heated to a temperature equal to or higher than the glass transition temperature, and is stretched uniformly as shown in FIG. However, when this is pulled below the glass transition temperature, the constituent molecules are forcibly stretched in a frozen state, so that the molecules are not smoothly aligned, and (c)
The result is a nonuniform mottled thread.

On the other hand, FIG. 2 shows an embodiment of drawing by the method of the present invention. As shown in FIG. 2 (d), an undrawn yarn (1) and a spun yarn (2) having a high degree of orientation and therefore hardly stretchable as shown in FIG. (E) When twisting this as shown in FIG. 3 (e), the undrawn yarn (1) is easily stretched, while the spun yarn (2) is hardly stretched. As shown in FIG. 2F, the undrawn yarn (1) is uniformly stretched by the length required for winding.

That is, when the yarn is stretched by pulling at both ends as shown in FIG. 1, the yarn is hardly stretched especially when the molecules are frozen below the glass transition point (secondary transition point). When the yarn is stretched, unevenness in thickness occurs such that a portion where the yarn is easily stretched stretches and a portion where the yarn is hardly stretched does not stretch much. However, as described above, if the yarn is twisted together with the yarn (2) and stretched in the process of winding it up, it is stretched little by little at each part of the yarn. Elongation does not occur, and the yarn is uniformly and evenly expanded at each portion. Therefore, the film can be uniformly stretched even at a temperature lower than the glass transition temperature, and can be uniformly stretched even at a halfway low magnification which tends to cause spots.

However, in this method, when the yarn is twisted and wound, it cannot be stretched beyond the extent that it can be naturally stretched, so that the upper limit of the magnification at which the yarn can be stretched is determined. However, what should be noted here is that when the unstretched yarn (1) is wound while the spun yarn (2) is slightly stretched, the unstretched yarn (1) is wound with the spliced yarn (1). The fact that the elongation of 1) is added, but in that case it is also stretched very uniformly. This is presumed to be because the undrawn yarn (1) is tightly wound around the auxiliary yarn (2) and stretched while being restrained. Therefore, the extension rate can be adjusted to some extent by adding the extension of the auxiliary thread (1). Further, if the undrawn yarn (1) and the additional yarn (2) are entangled in advance and the twisting operation is performed as described above, the restraining relationship between the unstretched yarn (1) and the spun yarn (2) is further increased, and the uniformity is further improved. The nature increases.

FIG. 3 shows an example of a concrete process of the present invention, wherein (1) is a polyester unstretched yarn of a raw material, and (2) is a polyester intermediate oriented yarn of an additional yarn which is harder to stretch. Are supplied from a pair of supply rollers (3), are entangled with each other by an air nozzle (4), and are mutually twisted by a false twisting tool (6) via an intermediate roller (5). As a result, before the false twisting device (6), the undrawn yarn (1) is stretched by being wound around the auxiliary yarn (2),
After passing through the false twisting tool (6), the wrapping is unwound again, and the two pieces are heat-set by the heater (3) via the delivery roller (7) while being joined together, and the winder (10) via the take-up roller (9). It is wound up. When weaving and dyeing the obtained processed yarn, it is completely different from the conventional polyester fabric by stretching while keeping the molecules frozen.
A very versatile woven fabric which is extremely soft, has a special feeling like marshmallow, and has no unevenness in thickness or stains.

In the present invention, in order to obtain such a feeling, it is necessary to lower the temperature at which the constituent molecules are in a frozen state when the undrawn yarn (1) is stretched, that is, below the glass transition temperature (secondary transition temperature). is there. For that purpose, use 16 for normal false twisting
Heating at the so-called thermoplastic temperature of synthetic fibers such as 0 to 240 ° C. is of course useless, and at most 78 ° C. or less, preferably 60 ° C.
(Less than or equal to 0.6 seconds as the heat treatment time). In general, the best results are obtained when working at room temperature without heat as in the previous example. In particular, a material having a low glass transition temperature may be subjected to forced cooling.

It is not essential that the unstretched yarn (1) and the auxiliary yarn (2) to be supplied are entangled in advance, but the entanglement causes the unstretched yarn (1) to be more uniformly stretched as described above. Also, there is an effect of preventing the yarn after being untwisted through the outer false twist from falling apart. In the latter case, interlacing after false twist untwisting may be used in some cases, but in general, interlacing before false twisting has less variation.

If the unstretched yarn (1) has a small amount of stretching, the additional yarn (2) is preferably stretched and added to the amount as described above. In this example, the distance between the rollers (5) and (7) is good. Is preferably performed in a stretched state, that is, in a so-called stretch false twist state. Even in this case, the undrawn yarn (1) can be uniformly stretched without forming a plaque as described above. In particular, when a false twist is given by a friction false twisting tool, a draw false twist is essential because the yarn slips. On the other hand, if it is a spindle false twist, it is not always necessary to use a stretch false twist, but in general, the friction false twist is easy to run smoothly without yarn catching.

In addition, in order for the unstretched yarn (1) to be stretched only when untwisted (1) is stretched when twisted by false twisting, the auxiliary yarn (2) needs to be harder to stretch than the unstretched yarn (1). For this reason, an intermediate oriented yarn and a highly oriented yarn having a birefringence of 0.03 or more are preferable. And about the drawability, undrawn yarn (1)
It is desirable that the natural stretch ratio (elongation% display) is 70% or more smaller than the natural stretch ratio.

In the present invention, the molecules in the frozen state are forcibly stretched to give a unique super soft feeling, but among them, as the molecules before stretching are not aligned in the fiber axis direction, that is, the lower the degree of orientation, the more the stretching is performed. As it becomes more difficult, the specificity of the texture increases. Therefore, it is desirable to use an unstretched yarn having a birefringence of 0.02 or less, more preferably 0.01 or less and almost non-oriented even if the degree of orientation of the undrawn yarn is high.

The yarn stretched forcibly in this manner generally has a large internal strain and a high shrinkage in boiling water. Therefore, when used, it is necessary to reduce the shrinkage by heat treatment. The heater shown in FIG. 3 (8) is used for that purpose, and the heating temperature is required to be at least 130 ° C., preferably at 160 ° C. or more for at least 0.1 second.
If this heating is performed continuously after the above-mentioned stretching step, it is safe because the produced yarn can be used in any field, but depending on the application, it may be made into a woven or knitted fabric or the like. It is possible.

The process of obtaining the mixed fiber yarn of the present invention is at first glance similar to the process of a method for producing a so-called false-twisted double-structured processed yarn found in JP-B-61-19733 and JP-B-56-25529. But,
The effects and the structure of the processed yarn produced thereby are completely different from each other.

That is, in the case of the conventional false twist wound double-layer structure processed yarn, one kind of multifilament is wound around another multifilament in the false twisting step, and this is heated to a high temperature and twisted. Both multifilaments will reorient and crystallize the multifilament polymer molecules in form.
The wound shape and kneaded shape of the filament wound by the false twist remain, and as a result, as shown in FIG. 4 (g), a "wound" two-layer structure processed yarn is obtained. Such a conventional false twist wound two-layer structure processed yarn is characterized by having a feeling like a spun yarn. On the other hand, in the present invention, even if the high stretch multifilament is wound around the low stretch multifilament by false twisting, it is not heated and set in this state, so that the winding or twisting remains at all. Without processing, the obtained processed yarn has straight filaments (no crimps) as shown in FIG. 4 (h), and does not have a spun yarn-like structure. That is, the filaments in the processed yarn are straight, thus forming a flat multifilament yarn. In the present invention, since the high-stretch multifilament is false-twisted while being forcibly stretched at a low temperature, the obtained processed yarn has an extremely soft touch and a unique wind that is completely different from the conventional false-twist drawn yarn. It becomes a flat multifilament yarn having a combination.

In the present invention, with respect to the composite ratio of the undrawn yarn (1) and the spun yarn (2), the unique hand according to the present invention originally has the side [Undrawn yarn (1)] that is forcibly stretched in a molecular frozen state, ie, low orientation. Since it occurs on the side (= side having a large natural stretching ratio), it is generally better to occupy at least half. However, in the case of a fiber having a molecular orientation that is particularly difficult to stretch, it may be possible to give priority to stretchability even if the texture is sacrificed to some extent, but even in such a case, at least 30% should be occupied.

On the other hand, if the low orientation side increases too much, the high orientation side [supplementary yarn (2)] becomes too thin and it becomes difficult to form a wrapped shape, and thread breakage or the like occurs, so that it is at most 80% or less. It is desirable to keep.

In addition, regarding the number of false twists, in the case of the present invention, since the purpose is not to perform false twist crimping, the effect can be obtained even if the number of twists is not always as large as that of the conventional false twisting. For example, false twisting A low number of twists can not give an effective crimp,
In the present invention, the cold drawing of the yarn occurs accordingly, and a certain effect occurs. However, unless the material is particularly difficult to twist, the number of false twists, that is, yarn breakage is likely to occur. With the following number of false twists, as long as stable processing can be performed, the higher the value, the more effective the yarn is stretched. When performing false twisting by friction false twisting, it is difficult to measure the number of false twists, but D / Y may be set to a value of about 1.3 to 2.8.

 Here, De = Yarn during false twisting Total De D / Y = Yarn surface speed of false twisting disk / Yarn speed during false twisting.

Furthermore, in the method of the present invention, it is necessary to use, as at least one of the two filaments having the above-mentioned difference in elongation, a polyester fiber containing a fine pore-forming agent as a multifilament.

The polyester referred to in the present invention has terephthalic acid as a main acid component and at least one glycol, preferably at least one alkylene glycol selected from ethylene glycol, trimethylene glycol and tetramethylene glycol as a main glycol component. The main target is polyester.

Further, a polyester in which a part of the terephthalic acid component is replaced by another difunctional carboxylic acid component may be used, and / or a part of the glycol component is replaced by the above-mentioned glycol other than the main component, or another diol component. Polyester.

Examples of the bifunctional carboxylic acid other than terephthalic acid used herein include isophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, diphenoxyethane dicarboxylic acid, β-hydroxyethoxy benzoic acid, p-
Oxybenzoic acid, 5-sodium sulfoisophthalic acid,
Aromatic, aliphatic and alicyclic bifunctional carboxylic acids such as adipic acid, sebacic acid and 1,4-cyclohexanedicarboxylic acid can be mentioned. Further, as the diol compound other than the above glycol, for example, cyclohexane-1,4
-Aliphatic, alicyclic and aromatic diol compounds such as dimethanol, neopentyl glycol, bisphenol A and bisphenol S, and polyoxyalkylene glycols.

When the fiber comprising the above polyester and containing the micropore-forming agent is subjected to, for example, an alkali treatment to remove the micropore-forming agent, a morphologically stable material having a diameter of 0.001 to 5 μm and a length / diameter ratio of 5 or more is obtained. It is a polyester fiber in which fine pores are arranged in the fiber axis direction. For example, as shown in FIG. 5, such polyester fibers have pores (streak-shaped voids) distributed on the fiber surface and also distributed on the fiber inner layer. In FIG. 5, reference numeral 11 denotes a fine hole
The length is the length of L shown in FIG. 5, and its diameter is the thickest part of one micro hole, and W is shown in the figure.

The pores of the polyester fibers have a diameter of 0.001 to
Although it is in the range of 5 μm, if it is less than 0.001 μm, there is no effect as a pore, and if it exceeds 5 μm, the fiber is cleaved from the portion of the pore, that is, the phenomenon of fibrillation of the fiber occurs, which is not preferable.

The length of the pores must be selected so that the ratio of length / perpendicularity is 5 or more. If the ratio is less than 5, the surface has a dry feeling and imparts an opaque feeling to the fabric. Therefore, a polyester-based fiber as described above cannot be obtained.

Such a fiber is obtained, for example, as follows. That is, when the polymer is a polyester composition, the following general formula [I] [In the formula, n represents an integer of 2 to 6. ] The polyester having a repeating unit represented by the following general formula [II] RSO ₃ M ... [II] A blend polymer obtained by adding and blending a metal salt of an organic sulfonate represented by the formula (1) is formed into chips according to a conventional method, dried and then spun and drawn according to a conventional method to obtain a multifilament.

Here, in the general formula [II], R represents an alkyl group or an alkylaryl group, and may have a linear or branched side chain. Particularly, a metal salt of an organic sulfonic acid in which R is an alkyl group is preferable from the viewpoint of compatibility of the polyester. M is an alkali metal such as Na, K or Li, or an alkaline earth metal such as Mg or Ca. Of these, Na and K are preferred. When using metal salts of organic sulfonic acids,
The compound need not be a single compound, and may be a mixture of metal salts of organic sulfonic acids having various alkyl groups or alkylaryl groups.

Specific examples of such an organic metal sulfonate include sodium stearyl sulfonate, sodium octyl sulfonate, sodium dodecyl sulfonate, and a mixture of sodium alkyl sulfonate having an average of 14 carbon atoms. Can be

The amount of the metal salt of the organic sulfonic acid to be mixed with the polyester is preferably in the range of 0.01 to 40 parts by weight per 100 parts by weight of the polyester. If the amount is less than 0.01 parts by weight,
As will be described later, the water absorption and hygroscopicity of the polyester molded product obtained after elution and removal of the organic sulfonic acid metal salt are not sufficient. If the amount is more than 40 parts by weight, mixing operation, molding and the like become difficult, which is not preferable.

The fiber obtained as described above is obtained by treating the fiber with an aqueous solution of an alkaline compound to dissolve and remove at least a part of the metal salt of organic sulfonic acid.

Or 2 to the acid component constituting the polyester
When a polyester obtained by copolymerizing 14 mol% of a bifunctional aromatic sulfonic acid is added and compounded, the polyester can be obtained by melt spinning and then treating the polyester with an aqueous solution of an alkaline compound. As the alkaline compound in this case, sodium hydroxide, potassium hydroxide, sodium carbonate, or the like is used, and the concentration varies depending on the processing conditions, but the target is achieved by setting the weight loss rate of the fiber to 5 to 30% by weight. Pores can be obtained.

The pores of the polyester fiber thus obtained are unstable to heat. For example, when dyeing, heat setting, or the like is performed, the pores are reduced. In this case, the density is reduced, so that it is necessary to perform a heat treatment before performing a pore generation treatment, for example, a treatment with an alkaline solution, so that the morphology of the pores obtained by the subsequent treatment is stabilized. That is, by this heat treatment, the shrinkage of the polyester fiber becomes 5% at a dry heat temperature of 100 ° C.
% Or less, whereby a stable form of pores which does not shrink or disappear can be obtained.

The conditions of the heat treatment are for obtaining pores having a stable form, and can be performed at a dry heat temperature of 160 ° C. or more, or a wet heat temperature of 100 ° C. or more (preferably, a dry heat temperature of 180 ° C.). C. or higher, or a moist heat temperature of 120 ° C. or higher). In addition, as a step of performing the heat treatment,
It may be carried out during the production of raw yarn or raw cotton, or may be performed in the state of yarn or fabric. However, tension and other strains are applied to the fibers during the yarn operation process and the fabric manufacturing process,
Performing the pore generation treatment while leaving these strains is not preferable in that a pore having a stable form is obtained,
The above heat treatment is preferably performed in the state of the fabric, and preferably immediately before the pore generation treatment. The fabric referred to in the present invention refers to a woven fabric or a knitted fabric made of continuous long fiber yarn, and at least the polyester fiber having the above-mentioned pores is used.
It contains 20% by weight or more.

The cross-sectional shape of the polyester fiber having pores is not particularly limited.

According to the present invention, since it has the above-described configuration, it is possible to provide a cool, dry surface touch and a highly opaque fabric.

That is, the polyester fiber after the alkali treatment has a diameter of
Since stable pores with a length / diameter ratio of 0.001 to 5μ and a length / diameter ratio of 5 or more are arranged in the fiber axis direction and distributed in the fiber inner layer including the fiber surface, silk The surface should be close to the surface of the fiber.

Further, such polyester-based fibers have morphologically stable pores arranged in the fiber axis direction and distributed in the inner layer of the fiber including the fiber surface. It is also useful for improving the feeling of comfort with the surface touch.

And because these pores are stable in form,
The fabric made of the polyester-based fiber having such pores can maintain the effect as described above for a long time.

(Function / Effect of the Invention) The mixed fiber of the present invention is disclosed in Japanese Patent Publication No.
Although it is apparently similar to the so-called false twist wound double-layer structure processed yarn shown in JP-A-6-25529 in its manufacturing process, its operation effect and yarn structure are completely different.

That is, in the case of a false-twisted two-layer structure processed yarn, the yarn is wound in a false twist state, heated to a high temperature, and the molecules of the fiber are reoriented and crystallized in the twisted form. Heat fixed. Therefore, even if this is untwisted, winding and twisting (twisting) remain, and “winding” as shown in FIG.
It becomes a two-layer structured yarn, which is characterized by a spun-like feel. On the other hand, in the present invention, even if the yarn is wrapped by false twisting, it is not heated and set, so that no wrapping or twisting remains and the yarn is (h)
It is a straight thread like this, and does not have a spun-like structure. In other words, the structure is a filament-like straight one, and it becomes an aggregated filament yarn of fibers having a very soft touch completely different from the conventional fibers by forcibly stretching the frozen molecules.

In addition, when the film is forcibly stretched at room temperature or lower at a temperature lower than the transition temperature, since the molecules are in a frozen state, the stretching tension becomes extremely large. In those where the molecules are hardly oriented, the force is very high. Therefore, productivity is usually difficult due to the occurrence of stretch wrap, yarn breakage, fluffing or slipping. However, when this is stretched by the twisting force as in the present invention, the stretching is performed smoothly,
In addition, since the stretching force is mainly given by the torsional force, not only equipment that can turn many times on the roller such as a drawing machine, but also a simple one-nip roller device such as a false twisting machine without production trouble and easy It also has the feature that it can be stretched to a minimum.

Further, the mixed fiber of the present invention has an extremely soft feeling that breaks the conventional concept of synthetic fiber. In particular, when applied to polyester fibers with relatively high modulus and thus a hard feel and strong waist, the characteristic hardness of polyester up to now is lost, and a very soft feel, speaking of marshmallow or sakura paper Since the filament has such a soft touch, its use can be expanded to inner clothing such as lingerie, baby clothing, luxury blouses, luxury dresses, etc., which directly touch the skin, and the merit thereof is great.

The material used in the present invention is not particularly limited as long as it is a stretchable synthetic fiber. Particularly, when applied to a polyester fiber, its essentially hard feeling can be greatly softened and improved, or the glass transition temperature can be improved. The effect of the application is enormous in that the effect of the low-temperature freezing and stretching of the present invention can be further exhibited.

The blended yarn of the present invention is finally subjected to alkali treatment, so that at least the outer layer portion of the yarn is a distribution of polyester fibers having fine pores, so that it has excellent moisture absorption and dry surface touch. It is useful for improving the feeling of wearing comfort. Further, the mixed fiber itself is suitable for inner clothing such as lingerie or baby clothing which touches the skin with a very soft feel, soft touch.

Moreover, as a result of using the polyester fiber having the above-mentioned fine pores, the obtained polyester woven or knitted fabric is given a favorable dry feeling. This is considered to be due to the fact that the friction characteristics of the polyester fiber act to increase the difference between the dynamic friction resistance and the static friction resistance due to the micropores.

Furthermore, the present invention uses the specific agent as described above as a microporous forming agent, so that a reduction in wear strength due to fibrils caused by micropores formed by treatment with an alkaline solution is achieved. There are few problems.

As described above, according to the present invention, it is possible to obtain a super-soft special mixed yarn having excellent drape property and hygroscopicity, extremely high flexibility, and a unique feeling with a dry feeling.

(Examples) The present invention is further described by the following examples.

 The following measurements were made in the examples.

The boiling water shrinkage (BWS) and dry heat shrinkage (HS) of the multifilament yarn were made into a skein of about 3000 deniers, and a load of 0.1 g / de was applied thereto to read the original length l ₀ (cm). The load of the skein is 2mg / de
And heat-treated in boiling water for 30 minutes, dried at room temperature, and changed the load to 0.1 g / de to change its length l ₁ (cm)
Was read. Then, the load was changed again to 2 mg / de, and
After heat treatment for 1 minute in heated air at 0 ° C., the sample was taken out, the load was changed to 0.1 g / de, and the length l ₂ (cm) was read.

Self-elongation rate = BWS (%)-HS (%) The flexibility of the woven fabric was evaluated by bending hardness (BS), and the resilience of the woven fabric was evaluated by bending rebound (BR). Measurement method is JIS
The 6.20.3C method (rigid softness loop compression method) of L1096 was used.

The anti-pilling property was measured and evaluated using an ICI type tester shown in 4.1 of JIS L 1076, and by an A method (a method using an ICI type tester) shown in the same test method 6.1.

The abrasion strength was measured according to the method shown in A-3 method (folding method) of JIS L 1096, using # 600 as abrasive paper.

Example 197 parts of dimethyl terephthalate, ethylene glycol 1
24 parts and 0.118 part of calcium acetate are placed in a polycondensation flask with a rectifying tower, a transesterification reaction is carried out according to a conventional method, and after a theoretical amount of methanol is distilled off, the reaction product is transferred to a polycondensation flask with a rectifying tower. Transfer, 0.112 parts of trimethyl phosphate as a stabilizer, and 0.08 parts of antimony oxide as a polycondensation catalyst.
79 parts were added and reacted at a temperature of 280 ° C. and a normal pressure for 30 minutes.
After reacting under reduced pressure of 0 mmHg for 15 minutes, the pressure was once returned to normal pressure, and 2 parts of a mixture of sodium alkylsulfonate having 8 to 30 carbon atoms and an average carbon number of 14 was added. Then, the mixture was reacted with stirring for 30 minutes. The final internal temperature was 280 ° C., the final internal pressure was 0.32 mmHg, and the intrinsic viscosity of the obtained polymer was 0.665. After completion of the reaction, the polymer was formed into chips according to a conventional method and dried. Next, the dried chips were melt-spun according to a conventional method.

Polyester low-oriented undrawn yarn (UDY) obtained by spinning this modified polyester at a speed of 1300 m / min [150 denier / 20 filament], [Δn: 0.008, natural drawing ratio: 174
% (Magnification 2.74 times), elongation: 408%, glass transition point: 8
0 ° C, fineness 150de ', number of filaments 20], speed 3200
Polyester highly oriented undrawn yarn (POY) obtained by spinning at m / min [115 de '/ 15 filament] [degree of orientation: 0.04
8, natural stretching ratio: 45% (1.45 times in magnification), progress: 128
%, Glass transition point: 80 ° C, fineness: 115de, number of filaments:
And 15) with a blending ratio of 67:43, which was supplied to an air-entangled nozzle at an overfeed of 1.0% and a pneumatic pressure of 4.0 kg / cm ² to interlace the filaments with each other. Next, the entangled yarn is applied to a triaxial friction false twisting device rotating at a surface speed of 800 m / min at a speed of 400 m / min and an elongation of 50% (false twist tension: 47 g, untwisting tension). : 44g) and room temperature (30%)
And then twisted and twisted, and then passed through a 245 ° C heater (heat treatment time: 0.2 seconds) at an overfeed rate of 0.2% to thermally shrink each filament. The rate was reduced and wound up on a winder to obtain a yarn of 176 denier / 37 filaments. When the yarn was observed with a microscope, no deformation was observed in the cross-sectional shape of each filament. Furthermore, the yarn itself was non-torque, did not have any crimp, and showed the same appearance as a normal mixed fiber flat yarn.

In the above-mentioned processing, when only stretching was performed except for the false twist device, the required stretching tension was 155 g / d.

The properties of the obtained processed yarn were as shown in Tables 1 and 2.

Further, the same procedure as described above was carried out except that the stretching false twist temperature was changed to 70 ° C. (Example), 100 ° C. (Comparative Example), and 120 ° C. (Comparative Example). The results are shown in Table 1.

Using the mixed fiber, that is, the flat multifilament yarn, a dyed fabric was prepared under the following weaving conditions (texture: twill), alkali reduction treatment, and dyeing conditions.

Table 4 shows the properties of the obtained woven fabric.

Therefore, when the single fiber de is thick, the mixed fiber of the present invention gives a soft cloth with high repulsion, so that there is no need for alkali weight reduction processing. Further, as an additional feature of this yarn, the anti-pilling property and the abrasion resistance were remarkably improved as apparent from this table.

Furthermore, the special mixed polyester filament yarn obtained by this method is used as a warp / weft with a warp density of 40 yarns / cm and a weft density of 37.
Weave in a plain weave at book / cm, then perform pre-setting of the greige at 180 ° C, and then in a 35 g / boiling alkaline bath.
After processing for 40 minutes (15% by weight loss), final setting was carried out at 160 ° C. for dyeing.

As a comparative example, a normal polyester filament yarn at a preset temperature of 180 ° C. was used and the weight loss rate was 15% by weight.
Was subjected to alkali weight loss.

 Table 5 shows the above results.

As a result, the polyester fabric has a refreshing, dry surface touch and is completely different from the conventional polyester touch. It has become possible to commercialize in the ultra-soft field, which is a weak point of conventional polyester fabrics such as Wener.

(Effects of the Invention) The method of the present invention is capable of forming a mixed yarn consisting of an ultra-soft flat multifilament yarn having an extremely soft and unique feel by using a false twisting apparatus, and by using a simple operation, an extremely high efficiency. Can be manufactured. The ultra-soft flat multifilament yarn and the fabric obtained by the method of the present invention have a unique feel and excellent physical characteristics, and are used for inner clothing such as lingerie, for baby clothing, and for gentlemen. -Can be widely used for anti-repulsion soft clothing for women (for example, suits).

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining the conventional stretching principle, FIG. 2 is a schematic diagram for explaining the stretching principle of the present invention, FIG. 3 is a process diagram showing one embodiment of the present invention, and FIG. And FIG. 5 is a side view schematically showing a state in which micropores are distributed on the fiber surface. L: length of pore, W: diameter of pore, I: pore. In FIG. 3, (1)... Undrawn yarn, (2)... An additional yarn having a higher degree of orientation than undrawn yarn (1), (3)... Supply roller, (4). , (5) ... intermediate roller, (6) ... false twisting tool, (7) ... delivery roller, (8) ... heat treatment heater, (9) ... take-up roller.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D02G 1/00-3/48 D02J 1/00-13/00

Claims (1)

(57) [Claims] (1) When two or more polyester multifilament yarns having a cut elongation difference of at least 70% or more are aligned and false-twisted, at least one kind of multifilament yarn is False twisting using a polyester multifilament yarn blended with a microporous forming agent, untwisting after setting the setting conditions during false twisting to room temperature or at most 78 ° C, immediately after untwisting or in the subsequent process, 130 A method for producing a super soft special mixed yarn exhibiting dry feeling and drapability, characterized by being heat-treated at a temperature of at least ℃. Micropore former RSO ₃ M