JP2009185416A - Combined filament yarn, and woven or knitted fabric using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined filament yarn for a woven or knitted fabric, having aesthetic properties such as high color developing properties, a fullness feeling, or a soft feeling compatible with quality such as friction resistance characteristics and ironing press mark resistance characteristics which are impossible in a conventional technique. <P>SOLUTION: The combined filament yarn is a combined filament yarn 9 in which at least two polyester multifilament yarns A and B are combined, and satisfies ≤2 N/dtex strength. The single filament fineness of the multifilament yarn A composing a core part is ≤1 dtex, and the shrinkage percentage thereof in boiling water is ≥15%. The multifilament yarn B composing a sheath part comprises fine particles having ≤3% shrinkage percentage in boiling water and 0.02-0.1 μm average primary particle diameter near the yarn surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blended yarn and a woven or knitted fabric capable of achieving both aesthetic properties such as high color developability, swellness, and softness, which have been impossible in the past, and qualities such as friction resistance and iron resistance. .

  Polyester fiber is one of the most widely used synthetic fibers because of its excellent physical and chemical properties. However, it is more effective in coloring of dyed fabrics than natural fibers such as acetate, rayon, wool and silk. Further, it has a disadvantage that it has a specular gloss due to the smoothness of the fiber surface, and a color depth similar to that of natural fibers cannot be obtained. In particular, since the depth of black is significantly inferior to natural fibers, black color development is strongly desired in the black formal field and the like.

  As a means for solving such a problem, a technique for improving the color development by reducing the surface reflection amount of light by roughening the fiber surface of the polyester fiber is disclosed.

  For example, by treating the polyester fiber containing 0.5 to 10 wt% of inert inorganic fine particles having an average primary particle diameter of 100 μm or less with an alkaline solution, the fiber surface is randomly random with a size of 0.2 to 0.7 μm. Has disclosed a method of generating unevenness and improving color developability (see Patent Document 1). This method can give a certain surface form to the fiber, so that it can be expected to improve the color development to some extent. However, the obtained drawn yarn is highly oriented, so the dye of the drawn yarn is not sufficiently exhausted, and a satisfactory black Color development was not able to be obtained.

  In addition, a method of obtaining high color developability by combining a high shrinkage fiber and a low shrinkage fiber to make the yarn structure uneven is disclosed (see Patent Document 2). For example, it is possible to obtain a certain degree of color developability by combining these fiber surfaces with the unevenness of the yarn structure, but because of the high color developability, whitening due to friction fastness and ironing is inevitable.

It has long been a challenge for woven and knitted fabrics using different shrinkage blended yarns to achieve high color development, swelling, softness and other aesthetics as well as quality such as anti-friction properties and ironing resistance. .
JP-A-55-107512 JP 2000-144553 A

  An object of the present invention is to solve the above-mentioned problems of the prior art, and to achieve both aesthetic properties such as high color development, swelling, and soft feeling and qualities such as anti-friction properties and anti-ironing properties. The object is to provide a blended yarn and a woven or knitted fabric.

The present invention adopts the following configuration in order to achieve the above object. That is,
[1] A mixed yarn having a strength of 2 cN / dtex or less, in which at least two types of polyester multifilaments A and B are mixed, and the polyester multifilament A constituting the core has a single fiber fineness of 1 dtex or less, and The polyester multifilament B having a boiling water shrinkage ratio of 15% or more, and constituting the sheath part, has fine particles having a boiling water shrinkage ratio of 3% or less and an average primary particle diameter of 0.02 to 0.1 μm in the vicinity of the fiber surface. A mixed yarn characterized in that it is contained in

  [2] The mixed yarn according to [1], wherein the fine particles contained in the polyester multifilament B are colloidal silica.

  [3] The mixed yarn according to [1] or [2], wherein a twist having a twist coefficient of 18000 or more is applied.

  [4] A woven or knitted fabric using the mixed yarn according to [3].

  [5] A double woven fabric characterized in that the mixed yarn according to any one of [1] to [3] is arranged on the front side and a conjugate multifilament having a crimp expression function is arranged on the back side.

  [6] The double woven fabric according to [5], wherein the polyester multifilament in the sheath portion of the mixed fiber has microvoids on the fiber surface.

  According to the present invention, it is possible to provide a blended yarn and a woven or knitted fabric that can achieve both aesthetic properties such as high color developability, swelling feeling, and soft feeling, and qualities such as friction resistance and iron resistance.

  The blended yarn of the present invention is a blended yarn satisfying a strength of 2 cN / dtex or less, in which at least two kinds of polyester multifilaments, namely polyester multifilament A and polyester multifilament B, are blended. A core part and the polyester multifilament B comprise a sheath part. And the single fiber fineness of the polyester multifilament A constituting the core is 1 dtex or less, and the boiling water shrinkage is 15% or more, and the polyester multifilament B constituting the sheath is 3% or less in boiling water shrinkage, In addition, fine particles having an average primary particle diameter of 0.02 to 0.1 μm are contained in the vicinity of the fiber surface.

  By making the boiling water shrinkage rate of the polyester multifilament A constituting the core portion 15% or more and the boiling water shrinkage rate of the polyester multifilament B constituting the sheath portion 3% or less, the sheath portion of the blended yarn can be reduced. It can be made bulky. When the boiling water shrinkage of the polyester multifilament A is less than 15% or the boiling water shrinkage of the polyester multifilament B exceeds 3%, the sheath portion of the mixed yarn cannot be fully bulky, and the woven or knitted fabric It is difficult to impart swelling and black color development. The boiling water shrinkage of the polyester multifilament A is more preferably 15% to 30%, and the boiling water shrinkage of the polyester multifilament B constituting the sheath is more preferably 3 to -10%. When the boiling water shrinkage of the polyester multifilament A exceeds 30%, the texture becomes hard, which is not preferable. Further, when the boiling water shrinkage of the polyester multifilament B is less than -10%, it is not preferable because snag due to the occurrence of tarmi is likely to occur.

  In addition, the polyester multifilament A has a single fiber fineness of 1 dtex as below from the viewpoint of improving ironing performance. In general non-shrinkage mixed yarn, since the bulkiness is high, the ironing is poor, which is a big problem. As a result of intensive studies, it has been found that this cause is due to the use of yarns having a large single fiber fineness of the polyester multifilament A constituting the core part, so as to pursue the elasticity of the fabric. That is, since the bulky property is high, the sheath portion collapses during ironing, and the core portion inferior in color developability was easily exposed. In the present invention, the core multi-filament A has a single fiber fineness of 1 dtex or less, so that the core covering property can be greatly improved while maintaining a high bulkiness, and the sheath completely covers the core even when using an iron. Because it is coated, there is no problem with ironing.

  On the other hand, it is preferable that the single fiber fineness of the polyester multifilament A is 0.1 dtex or more from the viewpoint of imparting a minimum elasticity to the woven or knitted fabric. A more preferable single fiber fineness is 0.6 dtex or more and 1 dtex or less.

  Further, the total fineness of the polyester multifilament A is preferably 10 dtex or more and 35 dtex or less from the viewpoint of achieving both firmness and fastness to friction.

  It is important that the polyester multifilament B contains fine particles having an average primary particle size of 0.02 to 0.1 μm in the vicinity of the fiber surface in terms of improving the fastness to friction. General non-shrinkage mixed yarns have high bulkiness, so there is a large frictional resistance, and when the fabrics are subjected to friction, the sheath part peels off and the core part is exposed, resulting in a decrease in fastness. Met. In the present invention, this problem is solved by the following means. In other words, microvoids are generated on the fiber surface by causing the polyester multifilament B to contain fine particles and removing the fine particles in the vicinity of the fiber surface among the fine particles in the alkali weight reduction process. Although the fiber surface becomes uneven due to the microvoids, the fibers in the sheath are in point contact because the fiber surface is uneven, which can reduce the peeling of the sheath and the exposed core. As a result, frictional resistance can be lowered and friction fastness can be improved. Furthermore, the generation of microvoids can be expected to improve color developability and to improve softness by point contact. Note that the size of the microvoids depends on the size of the fine particles, and is approximately the same as the average particle size of the fine particles. In addition, the more preferable range of an average particle diameter is the range of 0.02-0.07 micrometer.

  In addition, the average primary particle diameter in this invention means the value which measured the circumscribed diameter of particle | grains with the particle size analyzer (LA-700) made from HORIBA, and was measured by n number 50.

  Examples of the fine particles preferably used in the present invention include colloidal silica. Colloidal silica is a material in which silicon oxide is the main component, and particles present in a single particle form are present as a colloid using water or a monovalent alcohol or diol or a mixture thereof as a dispersion medium.

  Also, the single fiber fineness of the polyester multifilament B is preferably 0.1 dtex or more and 5 dtex or less from the viewpoint of achieving both color developability and ironability.

Further, the total fineness of the polyester multifilament B is preferably 30 dtex or more and 120 dtex or less from the viewpoint of achieving both color developability and ironability.
It is very important that the blended yarn of the present invention is a blended yarn satisfying a strength of 2 cN / dtex or less to improve the fastness to friction. In the development of conventional blended yarn, it was common to design the raw yarn and yarn processing conditions so that the strength is 3.0 cN / dtex or more. The workability in the post-process such as twisting and weaving, and the quality such as the tearing strength when used as a fabric are taken into consideration. However, as described above, a decrease in the fastness to friction has been a serious problem with the different shrinkage mixed yarn having high bulkiness. In the present invention, as a result of intensive studies on a yarn structure that is difficult to deform due to friction, it is possible to generate single fiber fluff in the yarn structure due to friction and to strengthen the entanglement between single fibers, which greatly improves friction fastness. I found. That is, by designing the yarn strength of the blended yarn to be 2 cN / dtex or less, it is possible to generate single fiber fluff when subjected to friction, that is, the core yarn is not exposed and the friction fastness is improved. The problem no longer occurs. A more preferable yarn strength of the mixed fiber yarn is 1.7 cN / dtex or less.

  In order to set the mixed yarn strength to 2 cN / dtex or less, the fineness (single fiber fineness and total fineness) of the polyester multifilaments A and B may be appropriately adjusted. The total fineness of the polyester multifilament A at the core is designed to be 35 dtex or less and the ratio of the total fineness of the core to the total fineness of the mixed yarn is set to 40% or less, and the boiling water shrinkage of the multifilament B as the sheath is 3 By performing relaxation heat treatment or the like so as to be less than or equal to%, a mixed yarn having a strength of 2 cN / dtex or less can be obtained.

  In order to maintain the minimum strength in the twisting / weaving process, the ratio of the core total fineness to the total fineness of the mixed yarn is preferably 10% or more.

  Needless to say, if the strength is too low, yarn breakage frequently occurs in the twisting and weaving process. Therefore, the strength of the mixed yarn is preferably 1.0 cN / dtex or more.

  In the present invention, the fineness of the mixed yarn is preferably 160 dtex or less in consideration of the lightweight feeling of the fabric, and preferably 60 dtex or more in consideration of the wall thickness and the fabric strength.

  Further, in order to improve the strength and improve the core covering property when it is made into a fabric, it is preferable to create a woven or knitted fabric after applying a twist having a twist coefficient of 18,000 or more to the mixed yarn of the present invention. Moreover, in order to maintain an appropriate swelling, it is preferable that a twist coefficient is 35000 or less.

  At this time, the twist coefficient is calculated by the following method.

Twist factor = T × (dtex) ^1/2
T: Number of twists per meter (turns / m)
In the mixed yarn of the present invention, in addition to the polyester multifilaments A and B, filaments other than the polyester multifilaments A and B may be mixed.

  The woven or knitted fabric of the present invention is not limited by specifications such as the woven and knitted fabric and density of the woven and knitted fabric that are generally used. Moreover, as long as the effect of the present invention is not hindered, those subjected to blending with natural fibers such as rayon and wool, knitting, knitting, knitting, and the like are included, but are not limited thereto.

  In particular, when preparing a stretch fabric, it is preferable to use a double fabric in which the mixed yarn of the present invention is arranged on the front side and a conjugate multifilament having a crimping function is arranged on the back side. By placing the blended yarn of the present invention on the front side, it can be made into a fabric with high color development, swell and soft feeling, and the conjugate multifilament placed on the back side gives excellent stretch properties to the fabric. can do.

  The conjugate multifilament at this time expresses a coil swivel-shaped crimp without buckling or angular crimp specific to mechanical crimping by, for example, heat treatment.

  Examples of the conjugate multifilament include conjugate multifilaments in which at least two kinds of polymers or polymers of the same kind but different in intrinsic viscosity are mixed into a side-by-side type or an eccentric sea core type. In other words, when blending at least two types of polymers, at least two types of the polyesters may be arbitrarily selected and blended. For example, polyethylene terephthalate and polypropylene terephthalate may be blended. Moreover, when mixing the same kind of polymer, for example, polyethylene terephthalate having a different intrinsic viscosity may be mixed.

  The cross sections of the polyester multifilaments A and B of the present invention are round, triangular, flat, hexagonal, L-shaped, T-shaped, W-shaped, eight-leaf shaped, dog-bone shaped, etc. The type can be arbitrarily selected.

  For the polyester multifilament A or B, additives such as flame retardants, fluorescent brighteners, matting agents, colorants, antistatic agents, and cationic dyeable polyesters may be used as necessary.

  Next, the manufacturing method of the mixed fiber of this invention is demonstrated.

  Polyester multifilament A and polyester multifilament B used in the present invention are mainly composed of terephthalic acid, and are composed of ethylene glycol, tetramethylene glycol, polypropylene glycol, cyclohexane-1,4-dimethanol, pentamethylene glycol, and hexamethylene glycol. A polyester having at least one selected glycol component as a main glycol component. The polyester multifilament A can obtain a high shrinkage property by using a polyester in which a third component such as isophthalic acid is copolymerized.

  Moreover, in order to obtain the low shrinkage characteristics of the polyester multifilament B, known yarn processing such as a method of subjecting a highly oriented undrawn yarn to low-magnification drawing heat treatment, relaxation heat treatment, and direct relaxation heat treatment after drawing can be arbitrarily used. . Preferably, a relaxation heat treatment is performed after stretching that achieves both high color developability and yarn processability.

  In addition, as a method for mixing polyester multifilament A and polyester multifilament B, any mixing means such as twisted twisted yarn, interlace processing, taslan processing, etc. can be used. It is a Taslan process that can be expected to have a good texture and black color development.

  FIG. 1 is an example of a process for producing a blended yarn of the present invention. In FIG. 1, A is a polyester multifilament A, and B is a polyester multifilament B highly oriented unstretched multifilament. First, the polyester multifilament B is pre-stretched between the feed roller 1 and the feed roller 3 while being subjected to heat treatment by the hot pin 2. If the temperature of the hot pin at this time is 60 ° C. to 120 ° C., it can be uniformly heat-stretched, which is preferable. Next, relaxation heat treatment is performed between the feed roller 3 and the feed roller 5 while undergoing non-contact heat treatment by the hollow heater 4. If the hollow heater temperature at this time is 160 ° C. to 240 ° C., there is no unevenness in heat treatment, and effective relaxation heat treatment can be performed.

  Thereafter, polyester multifilament A is fed over by feed roller 8 and polyester multifilament B is fed over by feed roller 5, entangled by taslan nozzle 6, and the yarn is converged. At this time, in order to give strong entanglement to the yarn and considering the cost, the entanglement pressure is preferably 0.3 to 0.8 (MPa). At the time of entanglement, it does not matter whether water is added or not. However, the absence of water is advantageous in terms of productivity because the nozzle is less likely to get dirty. Regarding the entanglement overfeed, since the polyester multifilament B constitutes the sheath, the entanglement overfeed of A-B is preferably 3% or more. Moreover, in order to prevent generation | occurrence | production of a nep, a preferable upper limit is 10% or less.

Then, it is wound up as a mixed yarn 9 by a winder finally via the delivery roller 7.
The higher the yarn processing speed, the higher the productivity, which is preferable. However, in consideration of the stable processability, 200 to 1000 (m / min) is preferable.

  The mixed yarn of the present invention thus produced is made into a woven fabric or a knitted fabric using a known weaving method or knitting method. Any known structure can be applied as the woven or knitted structure.

  In the present invention, the woven fabric and the knitted fabric are collectively referred to as “woven fabric”. When the mixed yarn of the present invention is made into a woven or knitted fabric, there is no restriction on the structure or density.

  Furthermore, when a woven or knitted fabric using the blended yarn of the present invention is dyed and finished, there is no restriction on the processing method or processing apparatus, but there is a relaxed and fully unstretched stretch and bulging feeling. It is preferable to perform a liquid flow relaxation process. In addition, it is preferable to set the set temperature to 180 ° C. or higher and 230 ° C. or lower in order to increase the alkali weight loss resistance of the mixed yarn during intermediate setting. If the temperature exceeds 230 ° C., the sheath may be fused, which is not preferable.

In the present invention, it is preferable to perform alkali weight reduction on the woven or knitted fabric. The reason is that, as described above, microvoids can be formed in the polyester multifilament B by reducing the alkali. The alkali weight loss rate is preferably 5 to 35% by weight. If it exceeds 35% by weight, cracks are likely to occur in the polyester multifilament, which is not preferable. On the other hand, if it is less than 5% by weight, microvoids cannot be sufficiently generated on the fiber surface of the multifilament B.
In addition, a publicly known method and apparatus can be adopted as alkali weight reduction.

  Moreover, in order to improve black color development property, arbitrary deep color processes, such as providing the compound of a low refractive index to a woven / knitted fabric, can be given. As the deep color processing, for example, any prescription such as a method of treating with a fluorine compound, a method of treating with a urethane compound, a method of treating with a silicone compound, or a method of treating with a urethane compound and an epoxy compound is used. It doesn't matter.

  By using the blended yarn of the present invention to make a woven or knitted fabric, it is possible to achieve both aesthetic properties such as high color development, swelling and softness, which have been impossible in the past, and quality such as friction resistance and ironing resistance. be able to.

  The fibers obtained according to the present invention are particularly suitable as clothing for black formal materials, but are also suitable for use in other women's and men's clothing as well as sports clothing such as jerseys, athletic wear, and ski wear.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each physical property in an Example was measured with the following method.

(1) Boiling water shrinkage rate Polyester multifilaments A and B are taken out from the mixed fiber in 6 cm increments and used as samples. Samples marked at 5 cm intervals under a load of 0.1 g / dtex are wrapped in gauze and heat treated at 98 ° C. for 30 minutes under no tension. Thereafter, the sample is taken out, air-dried for 24 hours, and again, after fully developing the crimps developed under a load of 0.1 g / dtex, the interval (L) marked before the heat treatment is read, and the following formula is used: It represents the boiling water shrinkage of polyester multifilaments A and B.
Boiling water shrinkage (%) = {(5-L) / 5} × 100
(2) Fineness According to JIS L1013 8.3 (2004) fineness measurement.

(3) Elongation and strength Measured based on JIS-L-1013 (2004).

(4) Friction fastness The test specified in JIS L 0849 (1996) is conducted at dry (fast dry fastness) and wet (wet fast fastness), and a grade is determined using a gray scale for contamination. did.

(5) Per iron The fabric was ironed at a rate of 2 reciprocations for 10 seconds at a spacing of 20 cm with a 160 ° C. steam iron, and the degree of perception was graded using a gray scale.

(6) Color development L value was measured using SM color computer (made by Suga Test Instruments Co., Ltd.). The lower the value, the better the color developability.

(7) Texture evaluation About each evaluation of a feeling of swelling and a soft feeling, it evaluated by four skilled judgment methods by 10 skilled persons.
○○: Excellent ○: Good △: Acceptable ×: Impossible

Example 1
Polyethylene terephthalate copolymerized with 8 mol% of isophthalic acid was spun at a spinning speed of 1700 (m / min), and then subjected to drawing heat treatment at 130 ° C. to obtain a polyester multifilament A having a total fineness of 22 dtex and 24 filaments (circular cross section). It was. On the other hand, a polymer made of polyethylene terephthalate containing 1.0% by weight of colloidal silica having an average primary particle size of 0.05 μm was spun at a spinning speed of 3000 (m / min) to obtain a total fineness of 90 dtex, 48 filaments (circular cross section). ) To obtain a polyester multifilament B which is a highly oriented unstretched filament having an elongation of 150%.

  After the polyester multifilament A and the polyester multifilament B are aligned, blending is performed according to the manufacturing method and manufacturing conditions shown in Table 1 and FIG. Obtained.

Next, the mixed yarn obtained in this way was subjected to additional twisting in the S direction with a twisting coefficient (K) = 20000 using a double twister twisting machine manufactured by Murata Co., Ltd. A 30-minute steam twist set was performed. The obtained twisted yarn was used as a warp and a weft, and a warp density: 160 yarns / 2.54 cm, a weft density: 120 yarns / 2.54 cm, and a flat double woven fabric was prepared. Next, the obtained woven fabric was subjected to a liquid flow relaxation treatment according to a conventional method, followed by drying and intermediate setting. Intermediate setting conditions were performed at a temperature of 180 ° C. Thereafter, it was immersed in a 3% aqueous solution of caustic soda, subjected to a 20% alkali weight reduction process, dyed with a commercially available black dye at 135 ° C., then subjected to reduction cleaning (80 ° C., 20 minutes), washed with water and dried. . The obtained dyed cloth is immersed in a resin liquid having the following composition, squeezed with a mangle so that the amount of the liquid attached becomes 90% by weight, dried at a temperature of 130 ° C., and heat-set at a temperature of 160 ° C. did.
・ "Maxguard" (registered trademark) EC470 (Kyokin Kasei Co., Ltd., fluorine compound, refractive index 1.38) ... 4%
"Toray Silicone" (registered trademark) SM8702 (manufactured by Toray Silicone Co., Ltd., amino-modified silicone, refractive index 1.48) ... 1%
"Nicepol" (registered trademark) NF20 (manufactured by Nikka Chemical Co., Ltd., anti-static agent) ... 1%
The resulting woven fabric had microvoids due to colloidal silica removal on the surface, and was excellent in color development, swelling and softness. Moreover, it was a result favorable also in the friction fastness and ironing which were a subject. The results are shown in Table 1.

Example 2
Polyethylene terephthalate copolymerized with 6 mol% of isophthalic acid was spun at a spinning speed of 1700 (m / min), and then subjected to drawing heat treatment at 130 ° C. to obtain a polyester multifilament A having a total fineness of 30 dtex and 36 filaments (circular cross section). It was. On the other hand, a polymer made of polyethylene terephthalate containing 1.0% by weight of colloidal silica having an average primary particle size of 0.05 μm was spun at a spinning speed of 3000 (m / min) to obtain a total fineness of 90 dtex, 48 filaments (circular cross section). ), A polyester multifilament B which is a highly oriented unstretched filament having an elongation of 150% was obtained.

  After the polyester multifilament A and the polyester multifilament B are aligned, blending is performed according to the manufacturing method and manufacturing conditions shown in Table 1 and FIG. Obtained. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric had microvoids due to colloidal silica removal on the surface, and was excellent in color development, swelling and softness. Moreover, it was a result favorable also in the friction fastness and ironing which were a subject. The results are shown in Table 1.

Example 3
A polymer composed of polyethylene terephthalate containing 1.0% by weight of colloidal silica having an average primary particle size of 0.05 μm was spun at a spinning speed of 3000 (m / min), and the total fineness was 90 dtex, 48 filaments (circular cross section), A polyester multifilament B, which is a highly oriented unstretched filament having an elongation of 150%, was obtained. A mixed yarn having the mixed yarn characteristics shown in Table 1 was obtained in the same manner as in Example 1 except that this polyester multifilament B was used. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric had microvoids due to colloidal silica removal on the surface, and was excellent in color development, swelling and softness. Moreover, it was a result favorable also in the friction fastness and ironing which were a subject. The results are shown in Table 1.

Comparative Example 1
Polyethylene terephthalate copolymerized with 8 mol% of isophthalic acid was spun at a spinning speed of 1700 (m / min) and then subjected to drawing heat treatment at 130 ° C. to obtain a polyester multifilament A having a total fineness of 60 dtex and 68 filaments (circular cross section). It was. Except for using this polyester multifilament A, blending was carried out in the same manner as in Example 1, and blended yarns having the blended yarn characteristics shown in Table 1 were obtained. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric had microvoids due to colloidal silica removal on the surface and was excellent in color developability, but had a problem of quality due to its second fastness to friction.

Comparative Example 2
Spinning was performed with a 100% polyethylene terephthalate component at a spinning speed of 1700 (m / min), followed by drawing heat treatment at 130 ° C. to obtain a polyester multifilament A having a total fineness of 22 dtex and 24 filaments (circular cross section). Except for using this polyester multifilament A, blending was carried out in the same manner as in Example 1, and blended yarns having the blended yarn characteristics shown in Table 1 were obtained. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric was insufficient in swelling and softness, and was unsatisfactory in color development.

Comparative Example 3
Polyethylene terephthalate copolymerized with 8 mol% of isophthalic acid was spun at a spinning speed of 1700 (m / min), and then subjected to drawing heat treatment at 130 ° C. to obtain a polyester multifilament A having a total fineness of 22 dtex and 16 filaments (circular cross section). It was. A mixed yarn having the mixed yarn characteristics shown in Table 1 was obtained in the same manner as in Example 1 except that this polyester multifilament A was used. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric had microvoids due to colloidal silica removal on the surface and was excellent in color developability, but there was a problem with the quality of the iron per second grade.

Comparative Example 4
As a blending method, a blended yarn having the blended yarn characteristics shown in Table 1 was used in the same manner as in Example 1 except that the stretching heat treatment was performed at a stretching temperature of 150 ° C. and the relaxation heat treatment was not performed. Got. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric was insufficient in swelling and softness, and was unsatisfactory in color development.

Comparative Example 5
A polymer made of polyethylene terephthalate containing 2.3% by weight of titanium oxide having an average primary particle size of 0.7 μm was spun at a spinning speed of 3000 (m / min), and had a total fineness of 90 dtex, 48 filaments (circular cross section), Polyester multifilament B, which is a highly oriented unstretched filament having an elongation of 150%, was obtained. A mixed yarn having the mixed yarn characteristics shown in Table 1 was obtained in the same manner as in Example 1 except that this polyester multifilament B was used. Next, a woven fabric was created and dyed by the same method as in Example 1 for the mixed yarn thus obtained, and evaluated.

  The resulting woven fabric had insufficient color developability and soft feeling, and the fastness to friction had a problem of quality with 2-3 grades.

The fibers obtained according to the present invention are particularly suitable for black formal materials as clothing, and are also suitably used for other women's and men's clothing, and sports clothing such as jerseys, athletic wear, and ski wear.

It is process schematic for demonstrating the manufacturing process of the mixed fiber of this invention.

Explanation of symbols

A: Polyester multifilament A
B: Highly oriented undrawn filament of polyester multifilament B 1: Feed roller 2: Hot pin 3: Feed roller 4: Hollow heater 5: Feed roller 6: Taslan nozzle 7: Delivery roller 8: Feed roller 9: Mixed yarn

Claims (6)

  A mixed yarn of at least 2 kinds of polyester multifilaments A and B and having a strength of 2 cN / dtex or less. The polyester multifilament A constituting the core has a single fiber fineness of 1 dtex or less and boiling water shrinkage. The polyester multifilament B constituting the sheath has a rate of 15% or more and contains fine particles having a boiling water shrinkage of 3% or less and an average primary particle size of 0.02 to 0.1 μm in the vicinity of the fiber surface. A mixed yarn characterized by that.   The mixed yarn according to claim 1, wherein the fine particles contained in the polyester multifilament B are colloidal silica.   The mixed yarn according to claim 1 or 2, wherein a twist having a twist coefficient of 18000 or more is applied.   A woven or knitted fabric using the mixed yarn according to claim 3.   A double woven fabric characterized in that the mixed yarn according to any one of claims 1 to 3 is arranged on the front side, and a conjugate multifilament having a crimp expression function is arranged on the back side.   The double woven fabric according to claim 5, wherein the polyester multifilament in the sheath portion of the blended yarn has microvoids on the fiber surface.

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