JPH04316626A - Polyester blended yarn exhibiting cottonlike touch - Google Patents

Abstract

PURPOSE:To provide a polyester blended yarn exhibiting an extremely excellent cotton-like touch. CONSTITUTION:A polyester blended yarn comprises a blended yarn of (A) high elongation fibers (single fiber fineness: 3-5de; elongation: >=1.5 times the elongation of low elongation fibers with (B) the low elongation fibers (single fiber fineness: 0.4-1.0de; the fluctuation rate of elongation: >=30%; at least a part of the fibers are cut), has an evenness U of 1.5-3.0% and a fuzz rate of 3-15 fuzzes/m, and produces dyeing irregularities when dyed, the blending ratio of the fibers A being 3-10%. The polyester blended yarn exhibits an extremely natural cotton-like touch.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester blend yarn exhibiting a cotton-like feel.

0002

BACKGROUND OF THE INVENTION Conventionally, synthetic fiber materials have been mainly used in the silk zone or wool zone, and have not been widely used in the cotton zone. However, in recent years, due to diversification of market needs, changing trends, and the high cost of cotton fabrics, synthetic fiber cotton-like materials are in demand.

Conventionally, cotton-like materials have been made using nylon fibers such as nylon filament fabrics wrinkled in the finishing process, nylon crimped yarns, or slub yarns made from composite polyester fibers. Many products have been proposed, such as those with a natural feel, appearance, good drapability, soft touch, etc., but all of these products only express some of the properties of cotton. It did not simultaneously satisfy the characteristics unique to cotton, such as appropriate fullness.

[0004] In order to improve the cotton-like texture by resolving these drawbacks, Japanese Patent Application Laid-Open No. 16956/1983 and Japanese Patent Application Laid-open No. 57-1982
No. 133233, Japanese Patent Application Laid-open No. 61-28042,
Many methods have been proposed in Japanese Patent Laid-Open No. 62-238835 and others. For example, the above-mentioned Japanese Patent Application Laid-Open No. 61-28042 discloses a method of drawing two or more types of highly oriented undrawn yarns with different elongations at a specific magnification to make the undrawn yarns on the high elongation side into thick and thin yarns. is proposed. However, the draw ratio adopted here is equivalent to the normal draw ratio when drawing undrawn yarn on the low elongation side, so the yarn on the low elongation side does not become thick and thin. Although the obtained fiber had a spanized feel, it was still difficult to describe it as having a cotton-like texture.

[0005]

OBJECTS OF THE INVENTION The present invention was made against the background of the above-mentioned prior art, and its object is to provide a novel polyester blend yarn with improved cotton-like feel.

[0006]

[Structure of the Invention] The present inventors have endeavored to solve the problems of the prior art described above and to obtain a polyester fiber exhibiting a cotton-like texture that has more stable quality and can be easily produced. As a result of this study, we have arrived at the present invention.

That is, according to the present invention, in a mixed yarn consisting of two types of polyester yarn groups A and B having different elongations at break, the high elongation yarn A group and the low elongation yarn B group have the following characteristics: The ratio of the number of fibers in group A constituting the mixed yarn is 3 to 10% (
relative to the entire mixed yarn), and the mixed yarn has uneven fineness (
Evenness U%) is 1.5-3.0%, irregular staining spots,
A polyester blend yarn exhibiting a cotton-like texture characterized by having 3 to 15 fluffs/m is provided. High elongation yarn group A (a) Single yarn fineness: 3 to 5 de Low elongation yarn B group (b-1) At least a portion of the constituent fibers have been cut (b-2) Single yarn fineness: 0. 4~1.0de(b-3
) Elongation L1 at peak strength: 15-30% (b-
4) Elongation variation rate: 30% or more However, the elongation variation rate is (L2 - L1 )/L1, where L2 is the elongation at the point where the stress exceeds the peak strength and drops to 75% of the peak strength. It is expressed as ×100. (b-5) Elongation ratio: 1.5 or more However, the elongation ratio is expressed as L3/L1, where L3 is the elongation at peak strength of the high elongation yarn A group.

The present invention will be explained in detail below. First, among the polyester yarn groups A and B with different cutting elongations that constitute the mixed fiber yarn of the present invention, the yarn group A on the high elongation side has a single yarn fineness of 3 to 5 deniers, and the mixed fiber yarn is It is necessary that the ratio of the number of fibers in group A to the total number of fibers constituting the fiber is 3 to 10%. If the single yarn fineness is out of the above range, the feel of the fabric, such as its tension and stiffness, will deteriorate when it is made into a fabric. On the other hand, if the ratio of the number of short fibers is less than 3%, the process stability (breakage during drawing) during the production of the mixed yarn may decrease, and the quality of the mixed yarn may deteriorate. This is not preferable because the tension of the obtained fabric is also reduced, and conversely, when it exceeds 10%, the texture of the obtained fabric becomes hard, which is not preferable.

Next, the other low elongation side yarn B group constituting the mixed fiber yarn of the present invention has (1) at least a part of the constituting fibers cut, and (2) a single yarn fineness of 0. .4 to 1.0 denier, (3) Elongation L1 at peak strength is 15 to
30%, (4) elongation variation rate is 30% or more, and (5) elongation ratio with high elongation yarn A group is 1.5 or more.

[0010] The texture, tactile sensation, visibility, etc. of a fabric are significantly influenced by the uneven fineness (spanized feel) and fuzz (cotton-like) of the yarns that make up the fabric. Since the yarn is obtained by low-magnification stretching (spotted stretching),
Since it has an unstretched part, it has the disadvantage that the alkali weight loss rate is too fast, it is difficult to perform weight loss processing, and the texture is hard.It also has the disadvantage that it does not have a spun yarn-like texture because it does not have fluff. On the other hand, in the mixed fiber yarn of the present invention, a part of the yarn group B on the low elongation side is cut, so even though there is almost no unstretched part in the constituent fibers,
It is possible to impart uneven fineness and fluff, and the cotton-like texture is further improved.

[0011] Furthermore, by setting the single yarn fineness of Group B within the above range, it is possible to obtain a soft texture; if it exceeds 1.0 denier, the texture becomes hard; On the other hand, if it is less than 0.4 denier, a slimy feeling will occur, which is not preferable.

Furthermore, in group B, the elongation L1 at the peak strength at cutting is 15 to 30%, and the elongation L1 at the peak strength value at cutting is 7% to 30%.
The elongation variation rate [(L2 - L1 )/L1 × 100%] when the breaking elongation of yarn B exhibiting 5% tenacity is L2 is 30% or more, and the elongation of yarn A at the peak tenacity at cutting. L
Since it has a specific elongation such that the ratio L3 /L1 with respect to L3 is 1.5 times or more, it can exhibit an extremely excellent cotton-like feel. If the elongation L1 is less than 15%, it is not preferable because not only the process stability (stretchability) during manufacturing the mixed fiber yarn decreases, but also the elastic modulus is high and the texture becomes hard. On the other hand, if it exceeds 30%,
This is not preferable because the staining spots become larger and periodic spots are more likely to occur, and the amount of fluff decreases. Furthermore, if the elongation variation rate is less than 30%, the cotton-like texture will be poor, the workability during post-processing will be reduced, and the elongation ratio L3
When /L1 is less than 1.5, it is not preferable because the process stability during production of the mixed fiber yarn deteriorates (yarn breakage is likely to occur when forming a yarn with fluff).

The elongations L1, L2, and L3 referred to herein will be further explained using FIG. 1. The mixed fiber yarn of the present invention is composed of yarns of group A and group B having different elongations at break, and FIG. 1 shows the loading curve of this mixed fiber yarn. The elongation when this stretching curve reaches the first peak strength is L
1, and then the elongation when the yarns of group B are sequentially cut and the tenacity decreases to 3/4 of the peak tenacity is L2,
Then, after all the yarns of group B are cut, the stress gradually increases and the elongation when it reaches the peak strength again is L3.
It is.

The mixed fiber yarn of the present invention is composed of the above-mentioned yarns of group A and group B, and further has a fineness unevenness (evens U%) of 1.5 to 3.0%, preferably 1. .8-3.
0%, the number of fuzz is 3-15 pieces/m, preferably 5-10
It needs to be about 1/m. If the unevenness of fineness is within this range, it will exhibit a spannized feel unique to natural fibers and will have a shape very similar to that of spun cotton yarn, but if it is less than this range, it will be a blended yarn made of ordinary flat yarns. It has a form similar to that of , and it is difficult to say that it has a form similar to cotton spun yarn. On the other hand, if it exceeds the above range, only a heathered fabric with dyeing spots will be obtained. In addition, the number of fuzz is 3/m
If it is less than 15 pieces/m, the cotton-like texture will be insufficient, and if it exceeds 15 pieces/m, the process stability (winding) during production of mixed fiber yarn will decrease, so the above range is preferably 5 to 10 pieces/m. It is necessary to do so.

[0015] The total denier of the blended yarn is within the same range as the cotton yarn normally used for clothing, especially 66 de (8
0 de) to 260 de (20 de). In addition, the number of filaments is 50 to 350 filaments,
In particular, it is preferable to use 100 to 300 filaments.

The polyester blend yarn of the present invention described in detail above can be produced, for example, by the method shown below.

That is, the mixing ratio (a/(a+b)) of the hole diameter of 0.3 to 0.5 mm (number of holes a) and the hole diameter of 0.1 to 0.2 mm (number of holes b) is 0.03 to 0. 10, with a total number of spinning holes of 30 to 350 holes, preferably 80 to 100 holes, to simultaneously spin two types of yarns with different thicknesses, or to spin two types of yarns with different diameters separately. Using a nozzle, these fibers are mixed when winding the yarn.

In the present invention, denier unevenness and elongation differences (internal structural unevenness) are imparted not only between the filaments constituting the mixed yarn but also in the length direction of the filaments to improve the spanized feel and dyeing asymmetry. It is preferable to give the fiber a more natural feel, and for this purpose, it is important to appropriately select and set the spinning temperature, cooling conditions, stretching conditions, heat treatment conditions, etc.

The uneven discharge of molten polymer from the spinneret is caused by
If the spinning temperature is lowered to increase the melt viscosity of the polymer, it will become larger, but if the spinning temperature is too low, the physical properties (strength x elongation 1/2) of the resulting fiber will rapidly decrease, making it impractical for practical use. (Weak thread limit temperature) Therefore, in normal spinning, a spinning temperature that is 5 to 6° C. higher than this weak yarn limit temperature is adopted, but in the present invention, the spinning temperature condition is set to the weak yarn limit temperature or about 2° C. higher than it. By doing so, it is possible not only to impart unevenness between and within the single fibers, but also to impart unevenness in the fineness of the entire mixed fiber yarn. In addition, in the present invention, the yarn A group with a single yarn fineness of 3 to 5 deniers is 3 to 5 deniers.
The method of cospanning so that 10% (number ratio) of the thick filaments is present is particularly preferable because this thick filament has the effect of suppressing the breakage of group B caused by discharge unevenness.

In addition, in normal spinning, the discharged yarn is forcibly cooled rapidly in order to obtain yarn with good uniformity, but in the present invention, the yarn is cooled in a delayed manner to cause uneven cooling and yarn wobbling. For example, it is preferable to provide a hot zone (ambient temperature of 250 to 350° C.) of about 90 to 150 mm under the cap, and cool and solidify the material after passing through the hot zone. By doing so, appropriate irregularities such as fineness irregularities, elongation irregularities, and dyeing irregularities can be imparted to the yarn. If the hot zone length is shorter than the above, spots (fineness spots, elongation spots, stain spots, etc.)
The expression of
If it is too long, cleaning the mouth surface becomes difficult.

[0021] After oiling, the cooled and solidified yarn is interlaced with an air nozzle (interlace treatment), and in particular, interlaced before being introduced into the take-up roller (pre-IL treatment). In order to improve the ease of removal, it is desirable to provide entanglements of about 5 to 20 entanglements/m. In addition, by doing so, it is possible not only to increase the uneven stretching ratio in the next stretching step (
(The intertwined parts of the single yarns make the stretching stress applied to the single yarns non-uniform, increasing unevenness), and prevent the single yarns of Yarn Group B, which were partially cut during stretching, from wrapping around hot rollers, stretching rollers, etc. It also has the effect of

[0022] The undrawn yarn that has been subjected to the entanglement treatment may be once wound up and then stretched with a drawing machine, or it may be drawn without being wound up (direct drawing method), but from the viewpoint of production efficiency, direct drawing is not recommended. A stretching method is preferred. Note that when stretching, the birefringence index is 4.
When an undrawn yarn of about 0x10-3 (undrawn yarn in the POY spinning speed range) is heated during stretching, crystallization is promoted and the stretching stress is increased, which tends to cause stretching unevenness, so the spinning take-off speed is 2000 m/ minutes or more, preferably 2500 to 400
It is desirable to set the speed to 0 m/min. On the other hand, the heat setting conditions after drawing are preferably 130°C or lower, which is lower than the normal temperature in order to maintain the asymmetry of the internal structure of the fiber. It is important to select conditions that match the shrinkage rate. In addition, the drawing ratio must be such that the obtained mixed fiber yarn satisfies the above-mentioned requirements, but the specific value also depends on the spinning speed, cooling conditions,
Since the conditions vary depending on the fiber cross-sectional shape, etc., it is important to appropriately select conditions suitable for each case.

[0023] The cross-sectional shape of the filaments constituting the mixed yarn of the present invention thus obtained is not particularly limited, and may be circular, triangular, flat, multilobed, etc., and may be solid or hollow. good. Among these, those having the shape shown in FIG. 5 are particularly preferable because many fine capillaries are formed between the fibers, resulting in excellent water retention.

[0024] The term "polyester" used in the present invention mainly refers to a polyester containing terephthalic acid as the main acid component and alkylene glycol having 2 to 4 carbon atoms, such as ethylene glycol or tetramethylene glycol, as the main glycol component. Among these, polyethylene terephthalate-based polyester or polybutylene terephthalate-based polyester, particularly polyethylene terephthalate, is preferred. It may also be a polyester in which a part of the terephthalic acid component is replaced with another difunctional carboxylic acid component, and/or a glycol component is replaced with a diol other than the above.

[0025] Examples of the difunctional carboxylic acid used here include isophthalic acid, naphthalene dicarboxylic acid,
Aromatic, aliphatic, and alicyclic difunctional compounds such as diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-oxyethoxybenzoic acid, P-oxybenzoic acid, adipic acid, sebacic acid, and 1,4-cyclohexanedicarboxylic acid. Further, difunctional carboxylic acids having an alkali metal sulfonic acid base such as 5-sodium sulfoisophthalic acid can be mentioned. Examples of diol compounds include aliphatic, alicyclic, and aromatic diol compounds such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A, bisphenol S, pentanediol, and hexanediol. Alternatively, a polyoxyalkylene glycol monoalkyl (or aryl) ether component represented by RO(R' O) n H may be copolymerized onto at least a portion of the terminal end of the polyester. Furthermore, these polymers may be blended with commonly used additives such as heat stabilizers, matting agents, antistatic agents, etc., if necessary.

[0026]

[Effects of the Invention] The polyester blend yarn of the present invention described in detail above has moderate fineness unevenness and dyeing unevenness, as well as an appropriate number of fuzz, so it exhibits an extremely excellent natural cotton-like texture. Has characteristics. Therefore, the mixed fiber yarn of the present invention can widely meet the needs of users, which have been diversifying in recent years.

[0027]

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

[0028]

[Example 1] Intrinsic viscosity 0.640, titanium oxide content 0
．． 3% by weight of polyethylene terephthalate with a pore size of 0.
4 round holes with a diameter of 4 mm and 8 round holes with a hole diameter of 0.15 mm
The resulting product was melt-extruded from a Cospan type spinneret having 0 discharge holes at a spinning temperature of 296° C., and spun and drawn using the spinning equipment shown in FIG. At this time, the hot zone under the spinneret has an ambient temperature of 258°C and a length of 90 mm, and after cooling and solidifying, an oil agent is applied to the yarn through an oiling roll, and an interlace nozzle (air pressure of 1 kg/cm2) is used to perform an interlacing treatment. The film was taken up at a take-up roll speed of 3,000 m/min, and then stretched to 1.33 times at a draw roll speed of 4,000 m/min, while being heat-set at a draw roll temperature of 120°C.

[0029] The obtained mixed fiber yarn has yarn A group of 5.0 de x 4
fil, consisting of yarn B group 0.5 de x 80 fil, the B
The peak strength elongation L1 of the group was 25%, and the elongation variation rate was 46.
%, and the peak strength elongation L3 of the A group is 70%, the elongation ratio L3 /L1 is 2.8, and the OPU is 0.22%.
, the number of entanglements is 5.2/m, and the fineness unevenness (Evens U%) is 2.
．． 1%, average number of fluffs is 9 pieces/m (MULT manufactured by Toray Industries, Inc.)
Using I FRAY counter, yarn length 20
(average value measured at 0 m). Note that the yarn breakage during yarn spinning was 2% or less, and the yarn spinning stability was also good.

[0030] Obtained mixed fiber yarn (60de/84fil)
It was knitted into a tube using a knitting machine (manufactured by Eikou), and was dyed with 1.5% owt of disperse dye Eastman Polyester Blue at boiling temperature.
After dyeing for 00 minutes, a fabric with irregular dyeing spots in the length direction was obtained. In addition, three of the above-mentioned blended yarns are combined and S-twisted at 500 T/m, and two of the twisted yarns are combined and Z-twisted at 550 T/m to make the double yarn (woven density 60 yarns/whale). On the other hand, the above mixed yarn was woven with an S twist of 350 T/m and used for the warp (weaving density 106 threads/whale) on a water jet loom weaving machine (manufactured by Tsudakoma), and a sodium hydroxide aqueous solution (18 g/l ) The fabric was treated at medium boiling temperature to reduce the weight by 20% to obtain a fabric with a basis weight of 118 g/m2.

The fabric obtained had a soft feel, a spanized feel, and a bulky feel, and was extremely similar in feel to a cotton fabric.

[0032]

[Example 2] Intrinsic viscosity of 4% copolymerized polyethylene glycol monophenyl ether with a molecular weight of 2500 is 0
．． Example 1 Polyethylene terephthalate having a titanium dioxide content of 0.3% by weight was prepared using a spinneret having 4 round holes with a hole diameter of 0.4 mm and 80 round holes with a hole diameter of 0.15 mm. It was spun in the same way. The air pressure during the entangling process was 0.5 kg/cm2, and the take-up speed was 3.
Change the speed to 200m/min and wind it up without stretching.
An undrawn yarn of denier/84 filaments was obtained. Three of the undrawn yarns are pulled together, and a stretching device shown in FIG. 3 (in the figure, two yarns are pulled together) is used to spread the fibers at a spreading tension of 1.2 g/ (measured under a guide), heating roll at 65°C, heat setting plate placed between heating roll and stretching roll at 150°C.
The film was stretched to 1.3 times while being heat set, and then subjected to an interlacing treatment.

The properties of the obtained mixed fiber yarn are as follows: Yarn A group has a single yarn denier of 3.5 de, 12 fil, strength of 2.8 g/de,
Elongation L3 60%, yarn B group single yarn denier 0.48 de
, 240fil, strength 3.8g/de, elongation L1 20
%, elongation variation rate 40%, elongation ratio L3 /L1 3.0
and OPU0.5%, Evens U%2.8%,
The number of entanglements was 5.0 pieces/m, and the number of fluffs was 12 pieces/m.

[0034] When the obtained mixed fiber yarn was dyed by tube knitting in the same manner as in Example 1, it had irregular dyeing spots in the length direction and had a rich natural feel. In addition, the obtained mixed fiber yarn was first twisted at 500 T/m (S twist) and final twisted at 550 T/m (Z twisted) for the twin yarns and plied wefts, while for the warp yarns at 550 T/m (
The above-mentioned mixed fiber yarn twisted with S twist) was woven at the same weave density as in Example 1, and subjected to 19% alkali weight reduction processing to obtain a fabric with a basis weight of 270 g/m2. This fabric had a soft feel, a spanized feel, and a bulky feel, and had a feel very similar to cotton. Further, the water absorption rate was 4.6% at 20° C. and 95% RH, and the water retention property was also good compared to a fabric made of ordinary polyester fibers.

[0035]

[Example 3] A spinneret (for yarn A group) having 12 spinning holes with a round hole diameter of 0.35 mm and a round hole diameter of 0.15 mm.
Using a spinneret (for yarn B group) having 120 spinning holes, and using the apparatus shown in FIG. After that,
Stretching and heat setting were carried out in the same manner as in Example 1 to obtain high elongation yarn A and low elongation yarn B. The characteristics of yarn A are 65 denier/
12fil, strength 3.2g/de, peak strength elongation 88
%, Evens U% is 0.7%, while the characteristics of yarn B are 65 denier/120fil, strength 2.8 g/de,
Elongation L1 is 42%, elongation variation rate is 35%, number of entanglements is 8.2
pieces/m, Evens U% was 1.9%.

Next, using the drawing device shown in FIG. 4, one yarn A and two yarns B, three yarns in total (however, two yarns are doubled in FIG. 4), are placed between the feed roll and the heating roll. After the entangling process was performed while relaxing under 0.5% overfeed through the arranged entangling nozzle (air pressure 0.8 kg/cm2), the heated roll temperature was 85°C and the heat set heater 220
It was stretched to 1.4 times while heat setting at ℃ and wound at a speed of 400 m/min to make a polyester blend yarn (139 de/min).
252fil) was obtained. This item has an elongation L1 of 17
%, the elongation variation rate was 38%, and the elongation ratio L3/L1 was 3.
06, the single fiber fineness of group A is 3.9 de, the single fiber fineness of group B is 0.4 de, and Evens U% is 2.1%.
The number of entanglements was 14/m and the number of fuzz was 7/m.

The tubular knitted yarn obtained by dyeing the obtained mixed fiber yarn in the same manner as in Example 1 has irregular dyeing spots and has a rich natural feel, and the fabric has a basis weight of 228 g/m2. Similarly, it had an excellent cotton-like texture.

[0038]

[Example 4] Yarn A and yarn B obtained in Example 3 were combined into three yarns, one yarn A and two yarn B, using the drawing device shown in FIG. 3, as shown below. A polyester blend yarn of 135 de/252 fil was obtained in the same manner as in Example 2, except that the conditions were changed as follows. [Changed conditions: opening tension 1.1 g/de, heat setting plate temperature 165°C, stretching ratio 1.2, stretching roll with 1% step, stretching roll speed 600 m/min, entangling treatment under 1% overfeed. (Pneumatic pressure 0.8 kg/cm2)] The obtained mixed fiber yarn has a single yarn fineness of 0.5 denier of yarn B group, a strength of 1.7 g/de, an elongation L1 of 26%, an elongation variation rate of 35%, Yarn A group single yarn fineness 5
de, strength 3.4 g/de, elongation L3 60% (elongation ratio L3 /L1 2.3), and number of entanglements 12/m
, evenness U% 2.7%, number of fluffs 10/m, and number of loops 3/m.

[0039] When this material was dyed and woven in the same manner as in Example 3 and evaluated, it had irregular dyeing spots and a cotton-like texture with excellent soft, spinized, and bulky textures. The fabric was obtained.

[0040]

[Comparative Example 1] In Example 1, the spinning temperature was 302°C.
The hot zone length under the cap is 28 mm (atmosphere temperature 240℃)
), a polyester blend yarn was obtained in the same manner as in Example 1, except that the air pressure during the entanglement treatment was changed to 1.5 kg/cm 2 and the temperature of the stretching roller was changed to 160°C.

[0041] Obtained mixed fiber yarn (60de/84fil)
Group B: Single yarn denier 0.5 de, 80 fil, strength 3.0 g/de, elongation L1 30%, elongation fluctuation rate 13.
3%, Group A: single yarn denier 5de, 4fil, strength 3.
8g/de, elongation L3 65% (elongation ratio L3/L1
2.17), and OPU 0.5%, number of confounds 6/
m, Evenness U% 0.7%, and number of fluffs 0.1/m.

When this was tube-knitted and dyed in the same manner as in Example 1, it was free from dyeing spots and lacked a spanized feel, and was no different from that obtained from a normal flat yarn. In addition, in the same manner as in Example 1, after weaving, the alkali weight was reduced to obtain a fabric with a basis weight of 121 g/m2, but although this fabric had an excellent soft feel, it lacked a fluffy and natural feel and had a cotton-like texture. That said, it was difficult.

[0043]

[Comparative Example 2] In Example 3, 2 yarns A and 1 yarn B
A polyester blend yarn of 139de/144fil was obtained in the same manner as in Example 3, except that the yarns were interlaced and the entanglement treatment was performed under an air pressure of 1.0kg/cm2 under 1.0% overfeed. .

[0044] This mixed fiber yarn has group A: single yarn fineness 5.0 denier, 24 filaments, elongation L3 54%, fiber number ratio 16.6%, group B: single yarn fineness 0.5 denier, 120
Filament, elongation L1 17% (elongation ratio L3 /L1
3.18), the elongation variation rate was 38%, and the number of entanglements was 9.
The number of fluffs was 8/m, Evenness U% was 1.92%, and the number of fuzz was 8/m.

[0045] When this material was evaluated in the same manner as in Example 3, it was found that it had irregular dyeing spots, and the fabric (basis weight 118.4 g/m2) after alkali weight loss had a soft texture and a spanized feel. However, it was somewhat stiff and lacked drapability.

[0046]

[Comparative Example 3] Spinning and drawing was carried out in the same manner as in Example 1, except that a spinneret having 1 round hole with a diameter of 0.35 mm and 84 holes with a round hole diameter of 0.15 mm was used. The spun yarn breakage rate was unsatisfactory, exceeding 30%, and the obtained mixed fiber yarn was also of poor quality.

[0047]

[Comparative Example 4] Ordinary drawn yarns A' and B' [However, yarn A': single yarn fineness 5.0 denier, 15 filaments,
Strength 5.0 g/de, elongation 34%, yarn B': single yarn fineness 2.0 denier, 48 filaments, strength 4.8 g/de
de, elongation 36%, elongation variation rate 38%], yarn A
'1 and three yarns B' were combined and mixed to obtain a polyester mixed yarn.

The obtained mixed fiber yarn was twisted at an S twist of 500 T/m, and woven with a weave density of 110 threads/whale for each warp/weft.
After 0% alkali weight loss treatment, the area weight is 110.6 g/m.
Two fabrics were obtained. The texture and appearance of the fabric obtained were no different from ordinary polyester fabrics, and were completely different from cotton-like fabrics, with poor drapability, spanned feel, and soft feel.

[0049]

[Example 5] Intrinsic viscosity 0.640, titanium oxide content 0
．． 3% by weight of polyethylene terephthalate with a pore size of 0.
Using two types of spinnerets, each having a 4 mm round shape with 12 holes and an H shape with a PCD of 1.0 mm and a slit width of 0.06 mm and 36 discharge holes, the spinning temperatures were adjusted using the apparatus shown in Figure 2. Melt extrusion at 290° C., spinning in the same manner as in Example 1, and winding without interlacing to obtain undrawn yarns A and B.
I got it. The characteristics of yarn A are 80 denier/12 fil, strength 3.1 g/de, peak strength elongation 86%, Evens U
%0.8%, on the other hand, the characteristics of yarn B are 45 denier/36 fil, strength 2.6 g/de, and elongation L1 of 38
%, elongation variation rate was 34%, and Evens U% was 1.2%.

Next, the above-mentioned yarn A is
One yarn B and two yarns B are combined to make 3 yarns (however, in Figure 4, 2 yarns are combined) and drawn at 1.42 times as in Example 3 to make 12 yarns.
0de/84fil was obtained. The elongation L1 of this thread is 19
%, elongation variation rate is 32%, and elongation ratio L3/L1 is 2.
7, the single yarn fineness of Group A is 4.7de, the single yarn fineness of Group B is 0.9de, and Evens U% is 2.3%, and the degree of entanglement is 1.
The number of fluffs was 8/m, and the number of fluffs was 12/m. In addition, the tubular knitted yarn obtained by dyeing the obtained mixed fiber yarn in the same manner as in Example 1 has irregular dyeing spots and has a rich natural feel, and the fabric with a basis weight of 212 g/m2 has a dry touch cotton-like texture. It had an excellent texture.

[0051]

[Comparative Example 5] Ordinary drawn yarn A' and B' [However, yarn A': single yarn fineness 2.5 de, 12 fil, strength 4.8
g/de, elongation 32%, yarn B': single yarn fineness 0.5de
, 144fil, strength 4.6g/de, elongation 40%, elongation variation rate 30%], one yarn A' and three yarns B'
Comparative Example 4: A polyester blend yarn obtained by combining and blending
Weaved in the same manner as above, reduced the alkali weight by 22%, and had a basis weight of 108g/
A fabric of m2 was obtained. Although the obtained fabric had drapability, it had no waist.

[Brief explanation of the drawing]

FIG. 1 is a drawing curve of a polyester blend yarn of the present invention composed of two groups of polyester yarns A and B having different elongations at break.

FIG. 2 is a schematic front view of a melt spinning apparatus used in Examples.

FIG. 3 is a schematic front view of a spinning and drawing apparatus used in Examples.

FIG. 4 is a schematic front view of a stretching device used in Examples.

FIG. 5 (a) to (e) are preferred embodiments of the cross-sectional shapes of fibers constituting the polyester blend yarn of the present invention.

[Explanation of symbols]

1 Spinneret part 2 Hot zone 3 Cooling air outlet 4 Oiling device 5 Intertwining nozzle 6 Take-up roll 7 Stretching roll 8 Winding package 9 Yarn A or mixed yarn 10 Yarn B or mixed yarn 11 Feed roll 12 Opening guide 13 Heating roll 14 Heat set heater 15 Stretching roll 16 Intertwining nozzle 17 Traverse ring 18 Winding package

Claims (1)

[Claims] Claim 1. A mixed fiber yarn consisting of two types of polyester yarn groups A and B having different elongations at break, wherein the high elongation yarn A group and the low elongation yarn B group have the following characteristics, and the mixed fiber yarn is made up of: A to do
The ratio of the number of fibers in the group is 3 to 10% (relative to the entire mixed yarn), and the unevenness of fineness (Evens U%) of the mixed yarn is 1.5.
~3.0%, irregular dyeing spots, and fluff of 3 to 15 pieces/m A polyester blend yarn exhibiting a cotton-like texture. High elongation yarn group A (a) Single yarn fineness: 3 to 5 de Low elongation yarn B group (b-1) At least a portion of the constituent fibers have been cut (b-2) Single yarn fineness: 0. 4~1.0de(b-3
) Elongation L1 at peak strength: 15-30% (b-
4) Elongation variation rate: 30% or more However, the elongation variation rate is (L2 - L1 )/L1, where L2 is the elongation at the point where the stress exceeds the peak strength and drops to 75% of the peak strength. It is expressed as ×100. (b-5) Elongation ratio: 1.5 or more However, the elongation ratio is expressed as L3/L1, where L3 is the elongation at peak strength of the high elongation yarn A group.