JP2003342851A - Polyester yarn of blended filaments with different shrinkage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester yarn of blended filaments with different shrinkage, providing a stretchable fabric simultaneously having delicate and elegant bulking feeling, natural and dry touch feeling and excellent grandrelle-like feeling. <P>SOLUTION: The polyester yarn of the blended filaments with the different shrinkage is obtained by blending and interlacing a low shrinkage yarn and a high shrinkage yarn which is a multifilament of a polytrimethylene terephthalate. The low shrinkage yarn comprises a polyethylene terephthalate multifilament having thick and thin parts in the fiber axis direction, and a multifilament substantially not having the thick and thin parts in the fiber axis direction, and has 0-6% self extension rate as the whole yarn in a dry-heat treatment (at 180°C) after hot water treatment (at 100°C). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heterogeneous-shrink mixed yarn composed of polyester multifilaments having different heat shrinkage rates. More specifically, the low shrinkage yarn comprises a multifilament having a thickness in the fiber axis direction and a multifilament having substantially no thickness in the fiber axis direction, and the yarn as a whole is treated with hot water (100 ° C.). Which is made of polyethylene terephthalate multifilament having a self-expansion rate of more than 0 to 6% in the dry heat treatment (180 ° C), and the high shrinkage yarn is polytrimethylene terephthalate multifilament mixed shrinkage yarn, The present invention relates to a polyester different shrinkage mixed yarn having the properties of simultaneously exhibiting stretchability, delicate and elegant swelling feeling, natural and dry touch, and excellent heat tone (dyeing and coloring effect).

[0002]

2. Description of the Related Art A mixed fiber yarn in which a plurality of polyethylene terephthalates having different physical properties, especially a heat shrinkage ratio are combined, is widely used as a material for giving a polyester woven or knitted fabric a swelling feeling and a touch feeling similar to natural fibers. However, the mixed yarn made of polyethylene terephthalate is not preferable as a stretchable material for use in sports clothing because the stretchability of the cloth is not sufficiently expressed.

On the other hand, polytrimethylene terephthalate fiber, which has characteristics such as excellent dimensional stability, light resistance, low hygroscopicity, heat setting property, which are the original properties of polyester, and excellent elastic recovery, is stretchable. Attention has been paid as a material, and a mixed yarn with polyethylene terephthalate fiber has been proposed as a polyester different shrinkage mixed yarn having stretchability.

For example, in Japanese Patent Application Laid-Open Nos. 11-140738 and 11-181639, polytrimethylene terephthalate is used as a highly shrinkable yarn, and polyester other than polytrimethylene terephthalate (mainly polyethylene terephthalate) is used as a low shrinkable yarn. The polyester different shrinkage mixed yarn for stretch fabric is disclosed.

By arranging the polytrimethylene terephthalate fiber in the high shrinkage yarn, the stretchability of the fabric is certainly improved as compared with the conventional polyethylene terephthalate mixed yarn. However, in any of the examples disclosed above, when the low shrinkage yarn made of polyethylene terephthalate fiber becomes the sheath component of the mixed fiber, the shape and characteristics in the fiber axis direction are uniform, and a simple layered structure is obtained. Since the resulting fabric has a simple texture, it has a delicate and elegant swelling feel like silk fabric, a natural and dry feel of spun yarn woven or knitted fabric such as cotton, and an excellent heat and shade effect. However, there is still a problem that is not fully expressed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned prior art, and its purpose is to provide excellent stretchability, delicate and elegant swelling feeling, natural and dry feel and excellent heather. Another object of the present invention is to provide a polyester different shrinkage mixed yarn which simultaneously expresses tone in a cloth.

[0007]

According to the study by the present inventor, the above-mentioned problem is "from a multifilament having a thickness in the fiber axis direction and a multifilament having substantially no thickness in the fiber axis direction. And, as a whole, the hot water (1
(00 ° C.) dry shrinkage (180 ° C.) treatment after self-expansion rate of 0 to 6% polyethylene terephthalate multifilament low shrinkage yarn and polytrimethylene terephthalate multifilament high shrinkage yarn mixed and entangled with each other. Polyester different shrinkage mixed yarn. Has been found to be achieved by.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The polyethylene terephthalate constituting the low shrinkage yarn of the different shrinkage mixed yarn of the present invention is a polyester in which 80 mol% or more, preferably 85 mol% or more of all repeating units are composed of ethylene terephthalate, and other than terephthalic acid and ethylene glycol. The components may be copolymerized in a proportion of 20 mol% or less with respect to the terephthalic acid component, but a cationic dyeable polyester obtained by copolymerizing substantially no copolymerizing component or 5-sodium sulfoisophthalic acid is used. preferable. The intrinsic viscosity (measured at 35 ° C. using orthochlorophenol as a solvent) is 0.45 to 0.70 which is usually adopted as a cloth material for clothing.
The range is appropriate. Further, known additives such as pigments, dyes, matting agents, antifouling agents, optical brighteners, flame retardants, stabilizers, UV absorbers, lubricants and the like may be added.

The low shrinkage yarn made of the above polyester is
In a dry heat (180 ° C.) treatment after a hot water (100 ° C.) treatment of the whole yarn, the yarn is composed of a multi-filament having a fineness in the fiber axis direction and a multi-filament having substantially no thickness in the fiber axis direction. It is important that the polyethylene terephthalate multifilament has a self-elongation rate of 0 to 6%. The low shrinkage yarn here means that the shrinkage percentage during hot water (100 ° C.) treatment is lower than that of the high shrinkage yarn described later, and the shrinkage percentage in hot water (100 ° C.) is 1
% Or less is desirable.

The low shrinkage yarn component having such characteristics is
Once subjected to hot water (100 ° C.) treatment, it is mainly placed in the sheath portion of the different shrinkage mixed fiber due to the difference in shrinkage characteristics. When the multifilament arranged in the sheath portion is subsequently subjected to a higher temperature heat treatment in a finishing step or the like, it self-expands to be arranged mainly in the core portion, which will be described later. The foot gap increases. The self-expansion rate in dry heat (180 ° C) treatment after hot water treatment was 6
If it exceeds%, self-expansion proceeds excessively and the surface of the fabric feels rough, so it must be avoided. Further, it is difficult to stably produce such a multifilament having self-stretchability. On the other hand, when the content is 0% or less (no elongation property), the resin does not self-expand or contracts, and thus a preferable morphological change in the fiber axis direction due to self-expansion described later does not occur.

At this time, since the multi-filament having a thickness in the fiber axis direction and the multi-filament not having a thickness in the fiber axis direction have different self-stretching characteristics from each other, a complicated self-stretching property is obtained. Elongation develops. That is, the multifilament having substantially no thickness in the fiber axis direction causes uniform self-expansion in the fiber axis direction and between the multifilaments. On the other hand, a multifilament having a thickness in the fiber axis direction causes random nonuniform self-expansion in the fiber axis direction and between the multifilaments.
Thus, in this low shrinkage yarn, a sheath structure having an overlapping layer structure in which two kinds of multifilaments are entangled intricately is developed.
Such an overlapping layer structure gives the cloth a delicate and elegant swelling feeling (silky feeling) like silk.

Furthermore, in a multifilament having a thinness in the fiber axis direction, after self-expansion, a thick fine portion (deep dye) and a fine fine portion (light dye) are redispersed by random self-expansion, and a preferable heather appears. At the same time, the natural and dry feel of the cotton woven or knitted fabric is developed due to the re-dispersed fine and complicated thick and thin morphological differences. When observing a multifilament having a thin and thin shape in the fiber axis direction in an arbitrary cross section, it is possible to grasp a state in which large and small cross sections are randomly mixed as shown in FIG. 1, for example. In the present invention, the fine fineness distribution in the fiber axis direction is defined by the ratio (Amax / Amin) of the maximum cross-sectional area (Amax) and the minimum cross-sectional area (Amin) in an arbitrary cross section of the fiber. The ratio (Am
ax / Amin) is 2.5 or more, more preferably 3.0
Within the above range, more complex self-extending property is expressed,
The fabric gives an excellent dry feel and heat. But Am
When ax / Amin is 8.0 or more, the large fineness portion is likely to be worn when the fabric is formed. In addition, the process passability during spinning tends to deteriorate. In addition, it is desirable that a hollow portion of 1 to 15%, more preferably 2 to 12%, exists in the fiber cross section of the multifilament having a large thickness. When the hollowness is less than 1%, the swelling feeling of the fabric may be insufficient. When it exceeds 15%, the spinning process passability is often deteriorated.

On the other hand, the high shrinkage yarn of the different shrinkage mixed yarn of the present invention needs to be made of polytrimethylene terephthalate in order to impart stretchability to the cloth. The term "polytrimethylene terephthalate" used herein means
A polyester in which 80 mol% or more, preferably 85% or more of all repeating units are trimethylene terephthalate. Such polyesters include terephthalic acid and 1,
Components other than 3-propanediol for all acid components are 2
The copolymer may be 0 mol% or less, preferably 15 mol% or less. As the copolymerization component preferably used, phthalic acid, isophthalic acid, naphthalene dicarboxylic acid, 5-sodium sulfoisophthalic acid as an acid component,
Examples thereof include adipic acid and sebacic acid, and as glycol components, ethylene glycol, butylene glycol, neopentyl glycol, bisphenol A, 2,2-bis {4- (β-hydroxyethoxy).
Examples include phenyl} propane. In particular, when the low shrinkage yarn is a cationic dyeable polyester, a cationic non dyeable homopolyester containing substantially no 5-sodium sulfoisophthalic acid is preferable.

Its intrinsic viscosity (measured at 35 ° C. using ortho-chlorophenol as a solvent) has an intrinsic viscosity of 0.7 to 1.5 in the same category as that of polytrimethylene terephthalate usually used for cloth materials for clothes. Those are preferable. Further, known additives such as pigments, dyes, matting agents, antifouling agents, optical brighteners, flame retardants, stabilizers, UV absorbers, lubricants and the like may be added.

The highly shrinkable yarn made of polytrimethylene terephthalate has a 10% elongation elastic recovery rate of 70% or more, preferably 80% or more, in order to impart good stretchability to the cloth.

The hot water (100 ° C.) shrinkage of the high shrink yarn is preferably in the range of 7 to 18%, particularly 10 to 16%. When the shrinkage rate of hot water (100 ° C.) exceeds 18%, structural strains tend to remain inside the fiber even after the hot water (100 ° C.) treatment, and shrinkage occurs due to further heat treatment in the finishing step, etc. In many cases, the texture of the fabric becomes extremely hard. On the other hand, hot water (100 ° C)
When the shrinkage ratio is less than 7%, it is difficult to increase the difference between the low shrinkage yarn and the low shrinkage yarn, and the obtained fabric has a low bulging feeling and tends to have a monotonous and flat texture. The cross-sectional shape of the multifilament forming the high shrinkage yarn is preferably a circular cross section from the viewpoint of process stability.

The polyester different shrinkage mixed yarn of the present invention is a mixture of the above low shrinkage yarn and high shrinkage yarn, and the degree of the entanglement is 40 to 90 yarns / m, especially 50 to 50. 8
The range of 0 / m is suitable. When the degree of entanglement is less than 40 yarns / m, the entanglement between the high shrinkage yarn and the low shrinkage yarn is insufficient and the cloth surface tends to have a rough appearance. On the other hand, when the degree of entanglement is more than 90 yarns / m, the entanglement between the high shrinkage yarn and the low shrinkage yarn proceeds too much, so that the interfiber gap decreases, and the swelling feeling of the fabric tends to be insufficient.

The total fineness of the mixed yarn is 60 to 300 dt
ex, composition weight ratio of low shrinkage yarn and high shrinkage yarn is 50/50
〜70 / 30 range, single yarn fineness of low shrinkage yarn is 1.5〜
The range of 6.0 dtex, the high shrinkage yarn single yarn fineness is 2.0 ~
The range of 7.0 dtex is preferable for ensuring the resilience, softness and delicate feel of the fabric.

The polyester different shrinkage mixed yarn of the present invention described above is produced, for example, by the following method to separately produce a low shrinkage yarn made of polyethylene terephthalate multifilament and a high shrinkage yarn made of polytrimethylene terephthalate multifilament. After that, the two types of multifilaments can be mixed and entangled to produce.

That is, for polyethylene terephthalate multifilaments, pelletized polyethylene terephthalate is dried by a conventional method, melted, discharged and cooled in a usual melt spinning equipment equipped with a screw extruder to obtain a suitable oil agent. It is applied and wound up without stretching to form a multifilament.

At this time, a discharge hole having a shape in which a small circular opening (4 in FIG. 2) and an arc opening slit (5 in FIG. 2) are arranged as shown in FIG. -132
Using a spinneret in which discharge holes (FIG. 3) having discharge portions (lands) whose cross-sectional area continuously increases toward the discharge side as described in Japanese Patent No. 810 are arranged on the same or different surfaces. It is important to melt and discharge.

The polymer streams discharged separately from the discharge holes each having a small circular opening and an arc-shaped opening slit are combined into a single polymer stream immediately after the discharge. At this time, it is important that the flow rate of the discharged polymer in the small circular opening is 1.5 to 5.0 times the flow rate of the discharged polymer in the arcuate opening slit.
The high-velocity polymer flow from the small circular opening collides with the side surface of the low-velocity polymer flow discharged from the arc-shaped opening slit through the linear opening slit, and minute pulsation occurs. Due to this pulsation, a thick fine portion and a fine fine portion are complicatedly mixed in the fiber axis direction in the process of cooling and solidifying the polymer flow. Further, such thick and thin spots in the fiber axis direction further have spots of physical properties, and during the relaxation heat treatment or dyeing and heat treatment in the finishing step described later, fine and complicated shrinkage spots or stretch spots appear. Become.

It is desirable that 2 to 8, and more preferably 3 to 6, small circular openings are arranged outside the outer arc of the arc opening slit. When the number of openings is one, the pulsation is small, the development of thick and thin spots in the fiber axis direction is not sufficient, and the ratio of the maximum cross-sectional area (Amax) to the minimum cross-sectional area (Amin) in any cross section of the low shrinkage yarn. (Amax / Amin) is often less than 2.5. In addition, the take-up of the spinning is often unstable. When the number of openings is 9 or more, the pulsation of the polymer flow becomes too intense, and spinning breakage is likely to occur.

The ratio (S1 / S2) of the discharge polymer flow rate (S1) at the small circular opening and the discharge polymer flow rate (S2) at the arcuate opening slit is as shown in JP-A-60-2.
As described in Japanese Patent Publication No. 59615, it can be arbitrarily set by adjusting the diameter of the small circular opening and the slit width of the circular opening. When the polymer flow velocity ratio (S1 / S2) is less than 1.5, pulsation is small and the cross-sectional ratio (Amax / Amin) is often less than 2.5. Polymer flow rate ratio (S1 / S2) is 6.0
If it exceeds, the pulsation of the polymer flow becomes considerably large,
Spinning breakage is likely to occur.

The arcuate opening slits are arranged inside the small circular opening so as to have the same circumference (PCD) (7 in FIG. 2). At this time, by changing the PCD, the hollow ratio in the cross section of the polyethylene terephthalate multifilament can be set to be 1 to 15%.

On the other hand, when a discharge hole having a discharge portion (land portion) (9 in FIG. 3) whose cross-sectional area continuously expands toward the discharge side is used, discharge is performed without disturbing the polymer flow in the spinneret. It is possible to significantly reduce the linear velocity of the polymer passing through the surface, and it is possible to take up the fiber while the spinning draft is 10,000 or more. The spinning draft here means the take-up speed (V
It is a ratio (V2 / V1) of the polymer average passing linear velocity (V1) on the discharge surface to 2), and is arbitrarily changed by appropriately changing the discharge cross-sectional area during polymer discharge according to the polymer discharge amount and the spinning take-up speed. can do. The spinning draft is 10,000 or more, more preferably 2.
The unstretched polyethylene terephthalate multifilament spun and drawn in the state of 0000 to 200,000 is unstretched polyethylene terephthalate discharged from a discharge hole having a shape in which the small circular opening and the arc-shaped opening slit are arranged. With multifilament 1
The fiber is drawn off at 000 to 3000 m / min.

At this time, when the spinning draft is less than 10000, the shrinkage and self-contraction with the polyethylene terephthalate multifilament discharged from the discharge hole having a shape in which a small circular opening and an arc opening slit are arranged. The difference in extensibility becomes small, and it becomes difficult to develop the sheath structure having the overlapping layer structure. If the spinning draft exceeds 200,000,
In many cases, excessive spinning tension is generated during the take-up of the spinning yarn, and the number of broken yarns increases.

When the take-up speed exceeds 3000 m / min, crystallization of the obtained unstretched polyethylene terephthalate multifilament proceeds, so that sufficient self-stretching property can be imparted even if the relaxation heat treatment described later is applied. It will be difficult. When the spinning take-up speed is less than 1000 m / min, the obtained unstretched polyethylene terephthalate multifilament is fragile, and it becomes difficult to use it for mixed fiber.

Next, the unstretched polyethylene terephthalate multifilament which has been taken out by spinning is once wound up, and then passed through a heat treatment apparatus having a heater provided between at least two rotating rollers to be subjected to a relaxation heat treatment so as to have self-stretchability. Use low shrinkage yarn. The heat treatment heater is preferably a non-contact type heater in terms of processability. Relaxation rate is 5 to 45
%, More preferably in the range of 10 to 35%, the heater temperature is 180 to 280 ° C., more preferably 200 to 260 ° C.
It is desirable to perform relaxation heat treatment within the range. When the relaxation rate is less than 5% or the heater temperature is less than 180 ° C, the shrinkage rate becomes 0% or more in dry heat (180 ° C) after hot water (100 ° C) treatment, and the self-stretchability is often lost. Become. Furthermore, if the heater temperature is less than 180 ° C,
Hot water (100 ° C) shrinkage rate Highly shrinkable yarn hot water (100 ° C)
There are many cases where it becomes difficult to lower the shrinkage ratio.
On the other hand, when the relaxation rate exceeds 45%, the running yarn is often wound around the roller during the relaxation heat treatment, and when the heater temperature exceeds 280 ° C, yarn breakage occurs near the heater. It will be easier.

On the other hand, the polytrimethylene terephthalate multifilament constituting the high shrinkage yarn can be obtained by melt spinning and drawing in the same manner as in ordinary polyethylene terephthalate. The stretching of the polytrimethylene terephthalate multifilament may be performed by a spinning-based stretching method in which the filament is once wound as an unstretched yarn and then separately stretched, or a one-step method (Spin-d) in which the filament is directly stretched after spinning.
raw). However, once the polytrimethylene terephthalate multifilament is wound up after spinning, contraction of the undrawn yarn occurs depending on the spinning conditions, and winding of the wound package occurs, which often makes it difficult to remove from the winder. Spin-dr
It is preferable that the yarn is produced by the aw method. The preheating temperature during stretching is preferably 45 to 90 ° C, and the stretching set temperature is preferably 100 to 140 ° C. If the preheating temperature is less than 45 ° C., the stretching will be non-uniform, and a multifilament with many quality irregularities is likely to be formed. On the other hand, when the preheating temperature exceeds 90 ° C., flow drawing is likely to occur, and it is difficult to obtain a multifilament having normal physical properties. When the drawing set temperature is lower than 100 ° C, the hot water (100 ° C) shrinkage ratio of the multifilaments often exceeds 18%. On the other hand, when the stretching set temperature exceeds 140 ° C, multifilament hot water (100 ° C)
The shrinkage rate is often less than 7%, and the number of yarn breaks increases during drawing. The draw ratio is preferably set so that the elongation of the multifilament is 35 to 65% depending on the spinning speed. If the draw ratio is set so that the elongation is less than 35%, the number of drawn yarns and fluffs increases. On the contrary, when the stretching ratio is set so that the elongation exceeds 65%, the 10% elongation elastic recovery rate of the obtained multifilament often becomes less than 70%.

The polyethylene terephthalate multifilament (low shrinkage yarn) and the polytrimethylene terephthalate multifilament (high shrinkage yarn) thus obtained were aligned and applied with an overfeed of 2.0 to 3.5%. On the other hand, with a known interlaced nozzle, the nozzle air pressure is adjusted so that the degree of entanglement is 40 to 90 nozzles / m, and mixed fiber entanglement is performed. The obtained polyester differently shrinkage mixed yarn is woven or knitted, and subjected to scouring, dyeing and finishing processing to be a stretch woven or knitted product.

[0032]

EXAMPLES The present invention will be described in more detail below with reference to examples. Each item in the examples was measured by the following method. (1) Intrinsic viscosity Orthochlorophenol was used as a solvent and measured at 35 ° C.

(2) Self-elongation rate (%) at dry heat (180 ° C) A fiber sample was put in a gauze bag and placed in hot water at 100 ° C for 30%.
It was soaked for a minute and left in a take-out bag for 24 hours at room temperature to dry. Then take out the fiber sample from the bag and
The dry heat shrinkage ratio (the value obtained by reversing the positive and negative values is the self-expansion ratio) was measured according to the L1013 8.18.2 B method. The dryer temperature was 180 ° C.

(3) Shrinkage rate (%) of hot water (100 ° C.) It was measured according to JIS L1013 8.18.1 B method. The hot water temperature was 100 ° C.

(4) Strength (cN / dtex), Elongation (%) A fiber sample was left for one day in a room kept at a constant temperature and humidity of 25 ° C. and a humidity of 60%, and then a sample length of 100 mm ( Set in Shimadzu tensile tester Tensilon,
Tensile strength at a speed of 200 mm / min, strength at break,
The elongation was measured.

(5) Cross-section ratio (Amax / Amin) A cross-section photograph of 560 times is taken for an arbitrary cross section of the low shrinkage yarn, and the cross section (Ama) of the maximum area of the filament group (B) is taken.
x) and the cross-sectional area of the cross-section (Amin) of the minimum area were measured, and Amax / Amin was taken as the cross-sectional ratio.

(6) Hollow ratio (%) In the photograph of the cross section obtained in the above item (5), the area (A) of the hollow portion of each cross section and the area (B) surrounding the cross section were measured and calculated by the following formula, The average value of the cross section was defined as the hollow ratio (%) of the measurement sample. Hollow rate (%) = A / B × 100

(7) 10% elongation recovery rate 0.03 cN / dtex (1/30 g / d)
e) With the load fully extended, set it on a tensile tester Tensilon manufactured by Shimadzu Corporation and set the initial sample length to 200.
mm, 10% elongation at a test speed of 200 mm / min, and then immediately recover at the same speed to record the elongation recovery curve, and read the elongation ratio with respect to the initial length of the sample when the initial load at recovery was the same B (%) Then, the 10% elongation elastic recovery rate was calculated by the following formula. 10% elongation elastic recovery rate (%) = ((10-B) / 10)
× 100

(8) Entanglement degree (ke / m) It was measured according to JIS L1013 8.15.

(9) Evaluation of texture The mixed fiber is knitted with a 12-gauge circular knitting machine into a tube having a length of 30 cm.
After relaxing and refining in hot water of 100 ° C., 15% alkali weight reduction processing was performed with a jet dyeing machine and preset at 180 ° C. Next, the greige is based on fabric weight (OWF)
2% by weight of a disperse dye (Sumikaron navy blue) was dyed at 130 ° C. and finally set at 170 ° C. to give a fabric sample for evaluation of texture, and the texture was judged by the following criteria by a sensory test. (Silky feeling) Level 1: When grasping the cloth, a delicate touch similar to silk and a moderate swelling are felt. Level 2: When grasping the cloth, a delicate feel and swelling similar to silk are felt, but to a lesser degree than Level 1. Level 3: When grabbing the fabric, a swelling feeling is observed with a plastic-like feel. (Dry feeling / Heather) Level 1: When you grab a fabric, you will feel a natural and dry feel. On the surface of the fabric, clear heather dispersed randomly and naturally is recognized. Level 2: A dry feel is felt when grasping the cloth, but a natural feel is lower than that of Level 1. On the surface of the fabric, heather dispersed almost randomly is recognized. Level 3: When the fabric is grabbed, it has a monotonous feel like plastic. The surface of the fabric is rough and no clear heather is observed. (Stretching) Level 1: There is sufficient resistance when pulled with both hands,
No deformation such as wrinkles is observed on the cloth after the separation. Level 2: There is a moderate amount of resistance when pulled with both hands,
A slight wrinkle-like deformation is observed on the fabric after the separation. Level 3: There is little resistance when pulled with both hands, and deformation such as wrinkles remains on the fabric after it is released.

[Examples 1 to 3 and Comparative Example 1] Polyethylene terephthalate containing 0.07% by weight of titanium oxide and having an intrinsic viscosity of 0.63 was melted at 290 ° C., and a discharge hole having a shape as shown in FIG. 2 was formed. In (Discharge hole A), three small circular openings (4 in FIG. 2) with a diameter of 0.25 mm have a PCD of 0.90 mm.
16 discharge holes connected to three 0.01 mm wide opening slits (5 in FIG. 2) arranged at the positions through linear opening slits (6 in FIG. 2), and FIG. The discharge area (land portion) (9 in FIG. 3) whose cross-sectional area having such a shape continuously expands toward the discharge side has a maximum discharge surface area 2
From a spinneret having eight circular 8.27 mm ² circular discharge holes (discharge holes B), discharge was performed at a discharge rate of 12.4 g / min. At this time, the ratio (S1 / S2) of the discharge polymer flow rate (S1) in the small circular opening and the discharge polymer flow rate (S2) in the arcuate opening slit was 3.1. In addition, the spinning draft for the polymer flow in the discharge hole B was 76,600, respectively.

Subsequently, an air flow of about 25 ° C. is blown from the ordinary cross-flow type spinning cylinder onto the polymer flow to cool and solidify it, and a spinning oil is applied thereto, and then the undrawn polyethylene terephthalate multifilament is wound at a speed of 1400 m / min ( 89 dtex / 24 fil) was obtained. At this time,
The cross-sectional ratio (Amax / Amin) of the multifilament component spun through the discharge holes A was 3.5, and the hollow ratio was 4.3%. The multifilament component spun through the discharge hole B had a uniform fineness in the fiber axis direction.

The unstretched polyethylene terephthalate multifilament obtained was passed through a heat treatment apparatus in which a slit heater was installed between two rotating rollers, and at the relaxation heat treatment temperature and relaxation rate shown in Table 1, at a passage speed of 330 m / min. Relaxation heat treatment was performed and wound up to obtain multifilaments having the self-expansion rate (dry heat (180 ° C.) shrinkage rate of positive / negative signs), hot water (100 ° C.) shrinkage rate and total fineness shown in Table 1, respectively.

On the other hand, polytrimethylene terephthalate containing 0.3% of titanium oxide and having an intrinsic viscosity of 0.95 is used as 26%.
It melts at 0 ° C and has a circular discharge hole with a hole diameter of 0.35 mm.
Discharge at a discharge rate of 28.2 g / min from 5 spinnerets, blow an air flow of about 25 ° C. from a normal cross-flow type spinning cylinder to cool and solidify, apply a spinning oil agent, and have a surface temperature of 55. Preheated by rotating the rotating roller (first roller) whose surface speed is set to 2700 m / min at ℃ 6 times,
Next, the surface temperature is 120 ° C and the surface speed is 3400 m /
The rotating roller (second roller) set to 6 minutes is stretched and heat-treated for 6 times, and then the total fineness of winding is 83 dte.
x of polytrimethylene terephthalate multifilament was obtained. The obtained polytrimethylene terephthalate multifilament has a 10% elongation elastic recovery rate of 85%, a hot water (100 ° C) shrinkage rate of 12.9%, and a strength of 2.9 cN.
/ Dtex, and the elongation was 46.2%.

The polyethylene terephthalate multifilament and the polytrimethylene terephthalate multifilament obtained by the above method are arranged in the creel part of the fiber mixing device, both yarns are aligned, and the overfeed rate is 2.5%. The interlaced nozzle was set to have a compressed air pressure of 3.5 kg / cm ² and subjected to a mixed fiber entanglement treatment at a speed of 300 m / min to obtain mixed fiber yarns having the total fineness and the entanglement degree shown in Table 1, respectively.

As a result of evaluating the obtained mixed fiber by the above-mentioned (9) texture evaluation method, the fabrics in Examples 1 to 3 have stretchability and are similar to silk as shown in Table 1. It had a delicate feel, a natural and dry feel, and a clear, random, naturally dispersed heather. On the other hand, the fabric from the mixed yarn of Comparative Example 1 is
I could hardly feel the silky feeling.

[0047]

[Table 1]

[Example 4] The same spinning conditions, relaxation heat treatment conditions and mixing conditions as in Example 1 except that the diameter of the small circular opening of the discharge hole A was changed to 0.20 mm and the polymer flow rate ratio was changed to 2.6. Under the fiber conditions, mixed yarns having the total fineness and the entanglement degree shown in Table 1 were obtained. As shown in Table 1, the texture of the fabric obtained from the obtained mixed-fiber yarn was slightly inferior to that of Example 1 in dry feeling and heat treatment, but exhibited excellent silky feeling and stretchability.

Example 5 The same spinning conditions, relaxation heat treatment conditions and mixed fiber conditions as in Example 1 were used except that the maximum discharge area of the discharge holes B was changed to 4.91 mm ² and the spinning draft was 13200. The mixed yarn having the total fineness and the degree of entanglement shown in (3) was obtained. As shown in Table 1, the texture of the resulting mixed fiber yarn was slightly inferior to Example 1 in silky feel, but showed excellent dry feel, heat and stretchability.

[Comparative Example 2] Example 1 except that a spinneret having only 24 discharge holes A and no discharge holes B was used.
The same spinning conditions, relaxation heat treatment conditions and mixed fiber conditions as in Table 1
The mixed yarn having the total fineness and the degree of entanglement shown in (3) was obtained. As shown in Table 1, almost no silky feeling was felt in the fabric texture from the obtained mixed fiber.

[Comparative Example 3] Example 1 except that there is no discharge hole A and only a spinneret having only 24 discharge holes B is used.
The same spinning conditions, relaxation heat treatment conditions and mixed fiber conditions as in Table 1
The mixed yarn having the total fineness and the degree of entanglement shown in (3) was obtained. As shown in Table 1, the cloth obtained from the mixed filament yarn did not exhibit a dry feeling or heat-sensitive property at all.

[0052]

According to the present invention, a stretchable fabric is provided with
A delicate and elegant swelling feeling like silk, a natural and dry touch feeling like cotton cloth, and an excellent heat tone can be simultaneously expressed.

[Brief description of drawings]

FIG. 1 is a schematic view showing an aspect of an arbitrary cross section of a low shrinkage yarn of the present invention.

FIG. 2 is a schematic diagram showing one embodiment of a spinneret discharge hole A used in the present invention.

FIG. 3 is a schematic view showing an aspect of a vertical cross section of a spinneret discharge hole B used in the present invention.

[Explanation of symbols]

1: Maximum cross-sectional area (Amax) 2: Minimum cross-sectional area (Amin) 3: Hollow part 4: Small circular opening 5: Arc-shaped opening slit 6: Linear opening slit 7: PCD 8: Polymer introduction section 9: Polymer discharging part (land part) 10: Polymer discharge surface

Claims (6)

[Claims] 1. A polyethylene terephthalate multifilament having a thickness in the fiber axis direction and a polyethylene terephthalate multifilament having substantially no thickness in the fiber axis direction.
C.) low shrinkage yarn having a self-expansion rate of 0 to 6% in dry heat treatment (180.degree. C.) treatment and high shrinkage yarn made of polytrimethylene terephthalate multifilament mixed and entangled with each other. Shrinkable mixed yarn. 2. The polyester hetero-shrinkage mixture according to claim 1, wherein the ratio of the maximum area (Amax) to the minimum area (Amin) in an arbitrary cross section of the multifilament having a thickness in the fiber axis direction is 2.5 or more. Yarn. 3. The polyester different shrinkage mixed fiber according to claim 1 or 2, wherein the multifilament having a thickness in the fiber axis direction has a hollow ratio of 1 to 15% in an arbitrary cross section. 4. The hot water (100 ° C.) shrinkage ratio of the high shrink yarn is 7
It is -18%, The polyester different shrinkage mixed fiber thread in any one of Claims 1-3. 5. The 10% elongation elastic recovery of the high shrink yarn is 70.
% Or more, and the polyester different shrinkage mixed fiber yarn according to any one of claims 1 to 4. 6. A low-shrinkage yarn is discharged from a discharge hole having a shape in which a small circular opening and a circular opening slit are arranged, and a discharge polymer flow velocity in the small circular opening is in the circular opening slit. Polyethylene terephthalate is melted and discharged as separate polymer streams so that the discharge polymer flow rate is 1.5 to 5.0 times, then merged, cooled and solidified, and a multifilament having a thin and thin cross section along the fiber axis is discharged. A multifilament having substantially no thickness in the fiber axis direction was obtained by melt-discharging polyethylene terephthalate so that the spinning draft was 10,000 or more through a discharge hole having a shape that continuously expanded toward the side, and then solidifying by cooling. After unifying, the unstretched multifilament, which was taken up at a speed of 1000 to 3000 m / min, was heated at a temperature of 18
The polyester different shrinkage mixed filament yarn according to any one of claims 1 to 5, which has been subjected to a relaxation heat treatment at 0 to 280 ° C and a relaxation rate of 5 to 45%.