JP4433679B2 - Blended yarn, woven and knitted fabric comprising the same, and method for producing the same - Google Patents

Description

【００６１】
表１は、実施例、比較例の編地を構成する多葉断面糸の横断面を顕微鏡写真にとり、多葉断面糸の横断面の葉の頂点のなす角度αを測定した結果である。
【００６２】
【表２】

【００６３】
表２の結果から明らかなように、実施例の編地は、比較例のものに比して、ソフトでさらっとした触感、ふくらみ感、光沢感に優れていることがわかる。
【００６４】
【発明の効果】
本発明によれば、ソフトでさらっとした触感、ふくらみ感、光沢感のある織編物を提供することができる。
【図面の簡単な説明】
【図１】本発明が提供する多葉断面糸の横断面形状の一例を示す横断面図であり、（ａ）は８葉、（ｂ）は６葉の例を示す。
【図２】本発明で定義した多葉断面糸の横断面形状を示す記号を説明する横断面図であり、（ａ）は８葉、（ｂ）は６葉の例を示す。
【図３】本発明で定義した多葉断面糸の葉部分形状を示す記号を説明する横断面図である。
【図４】本発明の実施例で用いた芯鞘複合糸の断面概略図である。
【符号の説明】
１：葉[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blended yarn having a soft and smooth touch, swell, and gloss, a woven or knitted fabric comprising the same, and a method for producing the same.
[0002]
[Prior art]
Conventionally, a blended yarn obtained by mixing two or more types of fibers having different boiling water shrinkage rates is subjected to heat treatment after knitting or weaving, so that the low shrinkage yarn forms a large loop due to the difference in shrinkage of the constituent yarns. It is well known that a fabric having a feeling of swelling and softness can be obtained.
[0003]
For example, a blended yarn (see Patent Document 1) is characterized in that a soft and swelled fabric can be obtained by blending nylon 6 and nylon 6 / nylon 66 copolymer having different boiling water shrinkage rates. Proposed.
[0004]
On the other hand, various studies have been made on deformed cross-section yarns, and many studies have been made on multi-leaf type cross sections. Typically, there is a method in which a yarn having a multi-leaf cross section is directly spun according to the shape of the die hole.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-355841
[Problems to be solved by the invention]
However, these blended yarns according to the prior art can provide a soft feeling of swell, but cannot provide a light touch and gloss. On the other hand, when a modified cross-section yarn is used to obtain a light touch and gloss, the conventional method of direct spinning from a deformed die tries to lower the surface tension due to the low viscosity of the polymer immediately after the die is discharged. Due to the work, the cross-sectional shape becomes rounded, and it is not possible to obtain satisfaction with the soft and smooth touch and gloss.
[0007]
In view of the background of the prior art, the present invention is to provide a blended yarn excellent in soft and smooth touch, swell, and gloss, a woven or knitted fabric comprising the same, and a method for producing the same.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to solve such problems. That is, the blended yarn of the present invention is a blended yarn composed of fibers having different boiling water shrinkage rates, and one of the yarns is 70 to 98% by weight of nylon 6 repeating units and 2 to 30% by weight of nylon 66 repeating units. Nylon 6 / Nylon 66 copolymer filament yarn, and the other yarn is a mixed yarn made of a modified cross-section filament yarn made of nylon 6 or nylon 66, the nylon 6 / nylon 66 co-weight The combined filament yarn is 30 to 70% by weight with respect to the whole mixed yarn, and the modified cross-section filament yarn is a modified cross-section filament yarn having a circumscribed circle radius / inscribed circle radius of 1.1 or more, further,
The irregular cross section is a shape in which the angle of the apex of the leaf α has three or more leaves than 90 °, the multi-leaf section yarns der Rukoto satisfying the following (1) to (2) It is a feature.
(1) 0.5r ≦ a _max
(However, the circumscribed radius of the filament cross section is r, and each leaf of the filament cross section shares two points B _i ( common to C _i-1 ) and C _i ( common to B _{i + 1} )). and a _max longest ones of line segments are connected by apexes T _i of each lobe.)
(2) Σ2S _i / K _i L _i N ≦ 1.5
(However, the length of the line segment B _i C _i connecting the two points B _i ( common to C _i-1 ) and C _i ( common to B _{i + 1} ) that each leaf of the filament cross section constitutes the adjacent leaf is represented by K and _i, the area of a portion where each leaf is cut at the line segment B _i C _i S _i, the number of distance leaves with was L _i. the filament cross section of the vertices and segments B _i C _i of each lobe Is N.)
In addition, the woven or knitted fabric of the present invention is characterized by using such a mixed yarn, and the method for producing the knitted or knitted fabric further comprises forming a woven or knitted fabric using the mixed yarn, The shrinkage treatment is performed and the shrinkage is 10% or more.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention has intensively investigated such a problem, that is, a soft and smooth tactile feel, a swelling feeling, a blended yarn excellent in glossiness and a woven or knitted fabric comprising the same, and a modified cross-section that is more effective for tactile feel and glossiness than before. When a new technique was adopted in which the yarn was first expressed in the high-order processing step and a cross-sectional shape that could not be obtained at the spinning stage was adopted, it was clarified that this problem could be solved for the first time.
[0010]
Hereinafter, the present invention will be described in detail.
[0011]
The high shrinkage yarn constituting the blended yarn of the present invention needs to be made of nylon 6 / nylon 66 copolymer filament. Further, the ratio of nylon 6 repeating unit to nylon 66 repeating unit in the raw material copolymer of nylon 6 / nylon 66 copolymer filament, that is, the copolymerization ratio is 70 to 98% by weight of nylon 6 repeating unit and nylon 66 repeating unit. It is necessary to set it as 2 to 30 weight%. If the nylon 6 repeating unit exceeds 98% by weight, the difference in shrinkage from the other nylon 6 or nylon 66 filament, which is manifested in post-processing, is not sufficient, and a soft tactile sensation and a bulging feeling cannot be obtained. On the other hand, if the nylon 6 repeating unit is less than 70% by weight, the heat resistance of the yarn is lowered and the polymer is deteriorated during spinning.
[0012]
Moreover, it is preferable that the nylon 6 / nylon 66 copolymer filament which comprises the mixed fiber of this invention contains antioxidant. Antioxidants are known to have an effect of suppressing deterioration over time when a synthetic fiber is exposed to light or heat. However, the antioxidant is inherently low in heat resistance of nylon 6 / nylon 66 copolymer. By adding, thermal deterioration during spinning can be suppressed. By suppressing this thermal deterioration, it is possible to prevent thermal denaturation caused by performing a tension heat setting process in a subsequent process, and to obtain a fabric having no light-dyed streaks.
[0013]
The reason why thermal deterioration is suppressed by adding an antioxidant to the copolymer polymer is that excess thermal energy is absorbed by the antioxidant, and for that purpose, the content of the antioxidant is: It is preferable that it is 0.01-1.0 weight part with respect to 100 weight part of nylon 6 / nylon 66 copolymer. If it is less than 0.01 parts by weight, the effect of suppressing thermal degradation is insufficient, and lightly dyed stripes when made into a fabric cannot be prevented. On the other hand, when the amount exceeds 1.0 part by weight, the color becomes dull when the knitted fabric is formed, and the quality is inferior and the manufacturing cost is increased, which is not suitable for knitted fabric. More preferably, it is 0.02-0.5 weight part.
[0014]
The antioxidant is not particularly limited as long as it has an effect of improving heat resistance. For example, hindered phenol-based, hindered amine-based, phenol / acrylate-based, sulfur-based and phosphorus-based antioxidants can be used. Of these, hindered phenolic antioxidants are preferred from the viewpoints of improving heat resistance and versatility.
[0015]
As a method of incorporating this antioxidant, a method of blending and melting an antioxidant into nylon pellets, a method of blending and melting a master pellet containing a high concentration of antioxidant into nylon pellets, and a melted nylon There are a method of adding an antioxidant and kneading, a method of adding an antioxidant to the raw material or reaction system before or during polymerization of nylon, and any method may be used as long as the two are uniformly mixed.
[0016]
Further, the nylon 6 / nylon 66 copolymer filament may contain a known matting agent, light-proofing agent, antistatic agent and the like, if necessary.
[0017]
The low shrinkage yarn constituting the blended yarn of the present invention needs to be made of nylon 6 or nylon 66 deformed cross-sectional shape filament. The cross-sectional shape is preferably a ratio of the circumscribed circle radius to the inscribed circle radius of 1.1 or more. If it is less than 1.1, there is not much difference from the circular cross section, and the glossiness is not satisfactory. In addition, there is no particular upper limit to the ratio of the circumscribed circle radius to the inscribed circle radius, but if it is 5 or more, the yarn-making property tends to deteriorate.
[0018]
The irregular cross section has three or more leaves whose angle α formed by the vertex of the leaf is 90 ° or less, and preferably the number of leaves is five or more. Here, the leaf refers to a portion that is a convex protrusion in the cross section, as indicated by reference numeral 1 in FIG. In addition, the angle α is an angle B _i T _i formed by the vertex T _i of the leaf and two points B _i (common to C _i -1) and C _i (common to B _{i + 1} ) that each leaf shares with the adjacent leaf. Define C _i .
[0019]
When the angle α formed by the apex of the leaf is less than 90 °, the number of the leaves is 2 or less, and when the woven or knitted fabric is formed, the protruding portion does not sufficiently protrude to the surface, and the soft touch is impaired. . The angle formed by the apex of the leaf can be obtained by taking a cross section of the yarn in a photomicrograph and measuring the angle.
[0020]
The radius of the circumscribed circle of the filament cross-section is r, and each leaf of the filament cross-section shares two points B _i (common to C _i -1) and C _i (common to B _{i + 1} ). The longest line segment connected by the vertices T _i is defined as a _max as shown in FIGS.
[0021]
At this time, the filament in the present invention is
(1) 0.5r ≦ a _max
Preferably 0.6r ≦ a _max , more preferably 0.7r ≦ a _max . That, 0.5r> at a _max can not be obtained the kidnapping and the touch and gloss due to the small length of the leaf.
[0022]
In addition, the length of a line segment B _i C _i connecting two points B _i (common to C _i -1) and C _i (common to B _{i + 1} ) that each leaf of the filament cross-section configures with the adjacent leaf Let K _i be the area of the portion where each leaf is cut by line segment B _i C _i , S _i , the distance between the apex of each leaf and line segment B _i C _{i be} L _i, and let the number of leaves in the filament cross section be N, the filament in the present invention is
(2) Σ2S _i / K _i L _i N ≦ 1.5
Preferably, Σ2S _i / K _i L _i N ≦ 1.35, and more preferably Σ2S _i / K _i L _i N ≦ 1.2. That is, when Σ2S _i / K _i L _i N> 1.5, the leaves are rounded, so that it is difficult to feel a light touch.
[0023]
For S _i , K _i , L _i , and N, the yarn is cut perpendicularly to the fiber length direction, the cut surface is observed with an SEM, photographed, and the copied cross-section has the area and length It can be obtained by actually measuring the thickness. From the actually measured values, S _i / K _i L _i N is calculated for i = 1 to N, respectively, and the sum is calculated to obtain Σ2S _i / K _i L _i N. For example, in the case of Figure 2 _{(a), S 1, K} 1, L 1, S 2, K 2, L 2 ···· actually measuring the _{S 8, K 8, L 8} , S 1 / K 1 L ₁ N, S ₂ / K ₂ L ₂ N... S ₈ / K ₈ L ₈ N are calculated and summed to obtain Σ2S _i / K _i L _i N. The number of leaves is 3 or more, and preferably the number of leaves is 5 or more. Here, the leaf refers to a portion that is a convex protrusion in the cross section, as indicated by reference numeral 1 in FIG. In addition, the angle α is an angle B _i T _i formed by the vertex T _i of the leaf and two points B _i (common to C _i -1) and C _i (common to B _{i + 1} ) that each leaf shares with the adjacent leaf. Define C _i .
[0024]
The single yarn fineness and the yarn fineness of the high shrinkage yarn and the low shrinkage yarn constituting the mixed yarn of the present invention are not particularly limited, but a single yarn fineness of 2 decitex or less has a soft and crisp feel. Preferred for obtaining.
[0025]
The boiling water shrinkage ratio of the high shrinkage yarn constituting the blended yarn of the present invention is preferably 20% or more, more preferably 20 to 40%. Further, the boiling water shrinkage of the low shrinkage yarn is preferably 20% or less, more preferably 5 to 20%. Furthermore, it is preferable for the difference in boiling water shrinkage to be 10% or more in order to obtain a feeling of swelling and softness. More preferably, it is 15% or more.
[0026]
Although the manufacturing method of the mixed fiber of this invention is not specifically limited, For example, it manufactures using the following methods.
[0027]
The method for producing the high shrinkage yarn constituting the blended yarn of the present invention is the above-described nylon 6 / nylon 66 copolymer polymer melt-spun, followed by oiling and entanglement treatment, and spinning take-up at a speed of 1000 m / min or more. Then, it is preferable to carry out by a method of subsequently drawing and winding, or a method of carrying out refueling and entanglement treatment after melt spinning and taking up the material without drawing and spinning at a speed of 1000 m / min or more. More preferably, the winding speed is 3000 m / min or more in terms of productivity.
[0028]
The method for producing a low shrinkage yarn constituting the blended yarn of the present invention uses a spinneret designed so that nylon 6 or nylon 66 is disposed in the core and polyester is disposed in the sheath, and after melt spinning. , Oil supply and entanglement treatment, spinning take-up at a speed of 1000 m / min or more, and subsequent drawing and winding, or after melt spinning, oil-feeding and entanglement treatment is carried out at a speed of 1000 m / min or more. However, it is preferably carried out by a winding method without substantially stretching. More preferably, the winding speed is 3000 m / min or more in terms of productivity.
[0029]
Moreover, the polymer which comprises a sheath component will not be specifically limited if it is a polymer which melt | dissolves by an alkali elution process, For example, a polyethylene terephthalate, a polybutylene terephthalate, a polypropylene terephthalate, and polylactic acid are preferable. In addition, these polymers can be copolymerized or contain additives as necessary in order to accelerate the alkali elution rate.
[0030]
The blended yarn of the present invention is wound after the high-shrinkage yarn and the low-shrinkage yarn described above are aligned, subjected to a entanglement process by interlace and subjected to a blending process. Thereafter, after knitting or weaving, an alkali elution treatment is performed to dissolve the sheath component, for example, polyester, leaving a core component having a multi-leafed cross-section and developing a shrinkage difference. That is, the alkali elution process may include a heat shrink process or a heat shrink process.
[0031]
Although the kind of alkali used for this alkali elution process will not be specifically limited if it is strong alkalis, such as sodium hydroxide, potassium hydroxide, lithium hydroxide, It is preferable to use sodium hydroxide. Alkaline treatment conditions are determined by the alkali concentration, treatment time, and treatment temperature, but it is desirable that the alkali concentration is 30 to 40 g / L and the treatment temperature is in the range of 80 to 120 ° C. Further, elution accelerators such as quaternary ammonium salts and cationic activators are known for increasing the alkali elution rate, and they may be used in combination as long as they do not impair the properties of the mixed yarn.
[0032]
The merit of using such a method is that the core component is surrounded by the sheath component, so that the core component is prevented from being rounded to reduce the surface tension and maintains a sharp shape. There is something you can do.
[0033]
Further, from the viewpoint of preventing the core component from becoming round, it is desirable that the polymer used for the sheath component has a higher viscosity than the polymer used for the core component. Further, the cross section of the yarn before elution of the sheath component may be round, square, flat, Y-shaped or any other shape, but a circle is preferable from the viewpoint of maintaining the shape of the core component.
[0034]
Further, it is necessary to construct the high shrinkage yarn at a mixing ratio of 30 to 70% from the viewpoint of expressing a swell. When it is less than 30%, the entire mixed yarn does not sufficiently shrink, and as a result, a sufficient loop cannot be formed, resulting in insufficient softness and swelling. On the other hand, the higher the ratio of the copolymer, the worse the fastness to washing, and if it exceeds 70%, the product standard cannot be satisfied.
[0035]
The mixed yarn of the present invention can be knitted and woven by a usual method to form a fabric. The structure of the fabric may be twill, taffeta, smooth, tricot or any other structure as long as the effects of the present invention are not impaired. However, when mixed with other cross-sectional yarns, a structure in which many yarns provided by the present invention appear on the surface. Is preferred.
[0036]
In addition, dyeing can be performed by a normal method, and antistatic, antibacterial, flexible finishing, and other known post-processing can be performed as necessary. Then, it is sewed into various clothing products. Especially, it is suitable as innerwear (lingerie, foundation, etc.) and sportswear (windbreaker, tennis wear, ski wear, training wear, etc.) worn directly on the skin.
[0037]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. The physical properties are measured as follows.
A. It was left for 2 hours in a room adjusted to a soft feeling temperature of 25 ° C. and a humidity of 50%, and the sensory evaluation was performed on ten persons with respect to the soft feeling of the knitted fabric. Evaluation was performed as follows.
There is a soft feeling: ○, soft feeling is not enough: Δ, soft feeling is not good: ×.
B. It was left for 2 hours in a room adjusted to a bulge sensation temperature of 25 ° C. and a humidity of 50%. Evaluation was performed as follows.
There is a feeling of swelling: ◯, the feeling of swelling is not enough: Δ, there is no feeling of swelling: ×.
C. The knitted fabric was left for 2 hours in a room adjusted to a temperature of 25 ° C. and a humidity of 50%. Evaluation was performed as follows.
There is a crisp feeling: ◯, the crisp feeling is not enough: △, there is no wiping feeling: x.
D. The knitted fabric was left for 2 hours in a room adjusted to a gloss temperature of 25 ° C. and a humidity of 50%. Evaluation was performed as follows.
There is glossiness: ○, glossiness is not sufficient: Δ, no: ×.
E. Washing fastness It was carried out according to JIS L 0844 “Testing method for fastness to dyeing for washing (A-2 method)”. Passing grade 4 or higher.
[0038]
Example 1
As a high shrinkage yarn, 0.06 parts by weight of a hindered phenol antioxidant “Irganox” 1330 (manufactured by Ciba Geigy Co., Ltd.) was powder blended, and the copolymerization ratio of 98% sulfuric acid relative viscosity of 2.77 was 85 / Nylon 6 / Nylon 66 copolymer 15 is melt-discharged at a spinning temperature of 270 ° C. using a round hole spinneret, cooled, lubricated, entangled, and taken up with a non-heated roller. The film was stretched 1.5 times, and wound at a winding speed of 4000 m / min to obtain 56 dtex 26 filaments. The boiling water shrinkage of this filament was 35%.
[0039]
As a low shrinkage yarn, using a spinneret designed so that nylon 6 having a 98% sulfuric acid relative viscosity of 2.62 is placed in an 8-leaf star core and polyethylene terephthalate is placed in a sheath, a weight ratio of 30: 70, melted and discharged at a spinning temperature of 290 ° C., cooled, lubricated, entangled, taken up by a non-heated roller, drawn 1.4 times with a roller heated to 160 ° C., and a winding speed of 4000 m / min Was wound to obtain a core-sheath composite yarn having a shape of 112 dtex and 36 filaments as shown in FIG. The boiling water shrinkage of this filament was 18%.
[0040]
The resulting high-shrinkage and low-shrinkage yarns are entangled with an interlacing pressure of 2.0kg / cm2 and mixed to process 22 decitex polyurethane elastic fiber ("Lycra" Toray DuPont Co., Ltd.) Knitted bare tengu knitted fabric.
[0041]
The obtained knitted fabric was completely dissolved in polyethylene terephthalate using caustic soda 60 g / L. At this time, a cross-section of the eight leaves shown in Table 1 was obtained. Subsequently, the dye is dyed with a liquid dyeing machine at 1% by weight of an acid dye (Nylosan Blue N-GFL 167% (manufactured by Clariant Japan)), a heating rate of 1 ° C./min, a dyeing temperature of 90 ° C., and a dyeing time of 30 minutes. Processing was performed, followed by FIX treatment with 3% by weight of Dimafix ESH (manufactured by Meisei Chemical Industry Co., Ltd.), a treatment temperature of 80 ° C. and a treatment time of 20 minutes, and finish setting was performed at 180 ° C. with a pin tenter.
[0042]
Table 2 shows the results of evaluating the obtained knitted fabric.
[0043]
Example 2
As a low shrinkage yarn, spinning was performed in the same manner as in Example 1 except that the discharge weight ratio of nylon 6 and polyethylene terephthalate was set to 45:55, and a mixed fiber was produced to obtain a knitted fabric.
[0044]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0045]
Example 3
As a low shrinkage yarn, spinning was carried out in the same manner as in Example 1 except that the discharge weight ratio of nylon 6 and polyethylene terephthalate was set to 35:65, and a mixed fiber was produced to obtain a knitted fabric.
[0046]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0047]
Example 4
A low-shrinkage yarn was spun in the same manner as in Example 1 except that the core component polymer was nylon 66 having a relative viscosity of 2.7% of sulfuric acid of 2.7 to produce a blended yarn to obtain a knitted fabric.
[0048]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0049]
Example 5
As low-shrinkage yarn, spinning was performed in the same manner as in Example 1 except that the polymer of the sheath component was polylactic acid to produce a mixed yarn, and a knitted fabric was obtained.
[0050]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0051]
Comparative Example 1
As a high shrinkage yarn, spinning was carried out in the same manner as in Example 1 except that the copolymerization ratio of nylon 6 / nylon 66 copolymer was 60/40, but yarn production was impossible.
[0052]
Comparative Example 2
As a high shrinkage yarn, spinning was carried out in the same manner as in Example 1 except that the copolymerization ratio of nylon 6 / nylon 66 copolymer was changed to 99/1 to produce a mixed yarn to obtain a knitted fabric.
[0053]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0054]
Comparative Example 3
A high-shrinkage yarn was spun in the same manner as in Example 1 except that 11 dtex 5 filaments were used, and a mixed yarn was produced to obtain a knitted fabric.
[0055]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0056]
Comparative Example 4
Spinning was carried out in the same manner as in Example 1 except that 83 dtex 52 filament was used as the high shrinkage yarn to produce a mixed yarn, and a knitted fabric was obtained.
[0057]
Table 1 shows the obtained Yaba cross-sectional shape, and Table 2 shows the results of evaluation of the knitted fabric.
[0058]
Comparative Example 5
As a low shrinkage yarn, nylon 6 having a 98% sulfuric acid relative viscosity of 2.62 is melted and discharged at a spinning temperature of 270 ° C. using a round hole spinneret, cooled, lubricated, entangled, and taken up by a non-heated roller. The fiber was spun in the same manner as in Example 1 except that it was stretched 1.5 times with a heating roller at 0 ° C. and wound at a winding speed of 4000 m / min to obtain 33 dtex 36 filaments. Manufactured and obtained knitted fabric.
[0059]
Table 2 shows the results of evaluating the obtained knitted fabric.
[0060]
[Table 1]

[0061]
Table 1 shows the results of measuring the angle α formed by the vertices of the cross-sections of the cross-sections of the multi-leaf cross-section yarns by taking a cross-section of the multi-leaf cross-section threads constituting the knitted fabrics of Examples and Comparative Examples.
[0062]
[Table 2]

[0063]
As is apparent from the results in Table 2, it can be seen that the knitted fabrics of the examples are superior in soft touch, swell, and gloss as compared with the comparative examples.
[0064]
【The invention's effect】
According to the present invention, it is possible to provide a woven or knitted fabric having a soft, smooth touch, swell and gloss.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of the cross-sectional shape of a multi-leaf cross-section yarn provided by the present invention, where (a) shows 8 leaves and (b) shows 6 leaves.
FIGS. 2A and 2B are cross-sectional views for explaining symbols indicating the cross-sectional shape of a multi-leaf cross-sectional yarn defined in the present invention. FIG. 2A shows an example of 8 leaves, and FIG. 2B shows an example of 6 leaves.
FIG. 3 is a cross-sectional view for explaining symbols indicating the leaf shape of a multi-leaf section thread defined in the present invention.
FIG. 4 is a schematic cross-sectional view of a core-sheath composite yarn used in an example of the present invention.
[Explanation of symbols]
1: leaves

Claims (7)

Nylon 6 / nylon 66 in which one yarn is composed of 70 to 98% by weight of nylon 6 repeating units and 2 to 30% by weight of nylon 66 repeating units in a mixed yarn composed of fibers having different boiling water shrinkage rates. A copolymer filament yarn, and the other yarn is a mixed yarn made of a modified cross-section filament yarn made of nylon 6 or nylon 66, and the nylon 6 / nylon 66 copolymer filament yarn is spread over the entire mixed yarn. 30 to 70% by weight, and the modified cross-section filament yarn is a modified cross-section filament yarn having a circumscribed circle radius / inscribed circle radius of 1.1 or more, and
The irregular cross-section is a multi-leaf cross-section filament yarn satisfying the following formulas (1) to (2), which has a shape having three or more leaves whose angle α formed by the apex of the leaves is 90 ° or less. Blended yarn.
(1) 0.5r ≦ a _max
(However, the circumscribed radius of the filament cross section is r, and each leaf of the filament cross section shares two points B _i (common to C _i-1 ) and C _i (common to B _{i + 1} )). and a _max longest ones of line segments are connected by apexes T _i of each lobe.)
(2) Σ2S _i / K _i L _i N ≦ 1.5
(However, the length of the line segment B _i C _i connecting the two points B _i (common to C _i-1 ) and C _i (common to B _{i + 1} ) that each leaf of the filament cross section constitutes the adjacent leaf is represented by K and _i, the area of a portion where each leaf is cut at the line segment B _i C _i S _i, the number of distance leaves with was L _i. the filament cross section of the vertices and segments B _i C _i of each lobe Is N.) A woven or knitted fabric comprising the mixed yarn according to claim 1. The woven or knitted fabric according to claim 2, wherein the woven or knitted fabric is formed by interweaving the mixed fiber according to claim 1 and polyurethane elastic fibers. The woven or knitted fabric according to claim 2 or 3 , wherein the woven or knitted fabric is for inner wear or sports wear. A method for producing a woven or knitted fabric, comprising forming a woven or knitted fabric using the mixed yarn according to claim 1 and then performing a heat shrinkage treatment. In Claim 5, the irregular cross-section filament yarn is a core-sheath type composite filament yarn in which the core component has an irregular cross-sectional shape made of nylon 6 or nylon 66, and the sheath component is made of polyester. A method for producing a woven or knitted fabric, wherein the core-sheath type composite filament yarn is mixed with the nylon 6 / nylon 66 copolymer filament yarn and then subjected to an alkali elution treatment to elute the sheath component polyester. The method for producing a woven or knitted fabric according to claim 6, wherein the alkali elution treatment is simultaneous with the heat shrink treatment or includes a heat shrink treatment.

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