JP2001214342A - Stretchable woven or knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stretchable woven or knitted fabric capable of providing the setting at a low temperature and developing a soft fitness feeling in a product using the woven or knitted fabric and useful especially as panty hose, a cotton knitted circular rib fabric and a wool fabric, etc. SOLUTION: This stretchable woven or knitted fabric is obtained by interknitting or interkweaving polyurethane elastic yarns satisfying the following conditions (1) to (3) with thermoplastic synthetic fibers or natural fibers. (1) >=60 deg. angle formed by the half-width of the maximum peak intensity of the azimuthal scanning in small angle X-ray scattering measurement, (2) <=2.5 deg. angle when expressing the spread of the half-width of scattering in the meridian direction into the equatorial direction as an angle viewed from the sample in the small angle X-ray scattering measurement and (3) <=135 deg.C maximum shrinking stress peak temperature in thermal stress measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretchable woven or knitted fabric, and more particularly to a stretchable woven or knitted fabric which can be set at a low temperature and exhibits a soft fit in products using the same.

[0002]

2. Description of the Related Art Polyurethane fibers are widely used for various applications by utilizing their high elasticity. With the expansion of the range of applications, new characteristics have been required for polyurethane fibers. Particularly with the recent stretch boom, polyurethane fibers have been used in combination with various types of fibers. For example, a melt-type polyurethane elastic yarn capable of high-temperature and high-pressure dyeing by improving wet heat resistance and capable of cross-knitting with polyester has been disclosed. Further, many polyurethane elastic yarns for improving heat resistance and elastic recovery have been reported. However, products using these polyurethane elastic yarns are not intended for low-temperature setting properties and soft fit properties. On the other hand, in the case of a knitted fabric with nylon, acrylic and natural fibers, for example, wool, cotton, silk, etc.,
Appropriate processing conditions will be adopted for these mating materials, but these processing conditions are mild. Therefore, even if a conventional polyurethane elastic yarn can maintain the physical properties after processing, it is difficult to obtain sufficient setting properties. Conversely, if the processing conditions are made severe (to increase the processing temperature) in order to obtain sufficient setability, there is a problem that the texture of the mating material to be combined is impaired.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a stretchable woven or knitted fabric particularly useful for pantyhose, cotton knit milling, wool fabric and the like.

[0004]

As a result of intensive studies by the inventor, the following contents have been found as measures for solving the above-mentioned problems. In order to develop a low-temperature settable and soft fit property, the structure of the polyurethane elastic yarn constituting the woven or knitted fabric according to the present invention is focused on a crystal region mainly composed of urethane hard segments, and the fiber axis of the region is focused on. This can be achieved by suppressing the growth in the direction transverse to the direction and disturbing the orientation with respect to the fiber axis. Specifically, the present invention employs the following configuration in order to solve the above problems. That is, the present invention is a stretchable woven or knitted fabric characterized by being formed by cross-weaving a polyurethane elastic yarn satisfying the following conditions (1) to (3) and a thermoplastic synthetic fiber, a natural fiber or a recycled fiber. (1) The angle formed by the half width of the maximum peak intensity of the azimuth angle scan in small angle X-ray scattering measurement is 60 degrees or more. (2) When the half-value width of the spread in the equator direction of the scattering in the meridian direction in the small angle X-ray scattering measurement is represented by an angle as viewed from the sample, the angle is 2.5 degrees or less. (3) Maximum shrinkage stress peak temperature in thermal stress measurement is 1
35 ° C or less. And, specifically, the thermoplastic synthetic fiber is a polyester fiber, a polyamide fiber or an acrylic fiber, the stretchable woven or knitted fabric described above, wherein the natural fiber is cotton, wool or silk. The stretchable woven or knitted fabric described above, wherein the regenerated fiber is a polynosic fiber. Hereinafter, the present invention will be described in detail.

First, it is desirable that the angle formed by the half width of the maximum peak intensity of the azimuthal scan in the small-angle X-ray scattering measurement of the polyurethane elastic yarn according to the present invention is 60 degrees or more. Here, the angle formed by the half-width of the maximum peak intensity of the azimuth scan in the small-angle X-ray scattering measurement is the center of the diffraction image photograph obtained by performing the azimuth scan measurement and the half-width of the maximum peak intensity. The angle between If the angle is less than 60 degrees, the orientation of the crystal region mainly composed of urethane hard segments will be good, the stretching power will be excessive, and it will be difficult to obtain a soft fit when wearing the product. The present invention provides a polyurethane elastic yarn that is deformed with relatively low stress when strain is generated in the fiber axis direction by intentionally disturbing the orientation of the crystal region. Preferably it is 75 to 85 degrees.

The polyurethane elastic yarn according to the present invention has a structure in which the angle formed by the half width in the equator direction in small angle X-ray scattering measurement is 2.5 degrees or less in addition to the above characteristics. The angle formed by the half-width in the equator direction in the small-angle X-ray scattering measurement is the half-width in the equator direction of the scattering in the meridian direction in the diffraction image photograph and the vertex angle of an isosceles triangle formed from the sample. If it exceeds 2.5 degrees, the crystal region,
In particular, the growth in the transverse direction with respect to the fiber axis direction becomes insufficient, and the obtained yarn has a low strength and elongation, resulting in a practical problem. Preferably it is 0.8 degrees or more and 2.5 degrees or less, more preferably 0.8 degrees or more and 1.5 degrees or less. If the angle is less than 0.8 degrees, the crystal region composed of the urethane hard segments, particularly in the lateral direction with respect to the fiber axis direction, becomes large, and the stretching force becomes excessive, which makes it difficult to obtain a soft-fit property when the product is worn.

It is desirable that the maximum shrinkage stress peak temperature in the thermal stress measurement of the polyurethane elastic yarn according to the present invention is 135 ° C. or less. If the angle exceeds 135 degrees, when combined with materials such as acrylic and wool, cotton, silk, etc., sufficient setting properties of these materials under proper processing conditions cannot be obtained, and the intended object of the present invention is achieved. Becomes difficult.
Therefore, the peak temperature of the maximum shrinkage stress is desirably as low as possible.

The maximum shrinkage stress in the thermal stress measurement of the polyurethane elastic yarn according to the present invention is desirably 10 mg / denier or less. When the amount exceeds 10 mg / denier, the shrinkage force after setting becomes high, and when combined with materials such as acrylic and wool, cotton, silk, etc., it is difficult to obtain sufficient setting properties of these materials under proper processing conditions. It is. It is preferably at most 7 mg / denier.

The heat setting property of the polyurethane elastic yarn according to the present invention is such that the dry heat setting property at 120 ° C. (PSD120) is 65% or more and the wet heat setting property at 105 ° C. (PSW10)
5) is desirably 75% or more. When a polyurethane elastic yarn having such characteristics is combined with a material such as acryl, wool, cotton, silk or the like, it is possible to obtain sufficient setting properties of these materials under appropriate processing conditions. That is, if the PSD 120 is less than 65%, the heat setting property under the dry heat treatment such as the preset step in the post-processing step becomes poor, and the desired soft fit property cannot be obtained. Similarly, if the PSW 105 is less than 75%, the heat resistance under wet heat treatment such as a dyeing step becomes good, which is inconvenient for the purpose of obtaining a soft fit. Preferably PSD 120 is 7
0% or more and PSW105 is 80% or more.

It is desirable that the molar ratio (NCO / OH ratio) between the isocyanate groups and the hydroxyl groups of the composition constituting the polyurethane polymer used as the raw material of the polyurethane elastic yarn according to the present invention is 1 or less. This means that the polyurethane elastic yarn is substantially free of crosslinks such as allohanate linkages. If the NCO / OH ratio exceeds 1, the excess NCO reacts with the urethane groups to form allophanate crosslinks. When such crosslinks are present, the heat setting property is reduced and the elasticity of the polyurethane elastic yarn is improved, making it difficult to obtain a soft fit.

[0011] The polyurethane elastic yarn of the present invention
It is desirable that the percentage of the return stress to the outgoing stress at the time of 150% elongation in the repeated stress measurement of 00% elongation be 20% or less. If it exceeds 20%, the elasticity of the polyurethane elastic yarn becomes high, and it becomes difficult to obtain a soft fit. More preferably, it is 10% or less.

As described above, the polyurethane elastic yarn according to the present invention can be set at a low temperature and expresses a soft fit. In particular, in the case of a fabric combined with another material, the texture and function possessed by both materials are exhibited. It is possible to manufacture without damaging.

Next, a production example of the polyurethane elastic yarn according to the present invention will be described. The polyurethane polymer used for the polyurethane elastomer of the present invention comprises a polyol, a diisocyanate, and a low molecular weight diol as a chain extender. In this case, it is preferable that the NCO / OH ratio is 1 or less, and that the polymer terminal is an OH group terminal in principle.
Specific production methods include a prepolymer method and a one-shot method, but are not particularly limited. In addition,
A urea bond may partially exist in the polymer as long as the effects of the present invention are not impaired.

The polyol used for the polyurethane polymer used for the polyurethane elastomer of the present invention includes:
Polyether polyols represented by polytetramethylene ether glycol, polyester polyols represented by polybutylene adipate, polycaprolactone polyols, polyester polycarbonate polyols exemplified by a reaction product of a polyester glycol such as polycaprolactone and an alkylene carbonate, ethylene The carbonate is reacted with a polyhydric alcohol such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and the like, and then a reaction product of the obtained reaction mixture with an organic carboxylic acid such as adipic acid, azelaic acid, sebacic acid, and 1 1,4 butanediol, 1,6 hexanediol, 2,2 dimethyl-1,3
Polycarbonate polyols obtained by a transesterification reaction of a polyhydroxyl compound such as propanediol, 1,8-octanediol and an aryl carbonate, for example, diphenyl carbonate, are exemplified. These may be used alone or in combination of two or more.

The number average molecular weight of the polyol is usually from 500 to
About 6000, preferably 1000 to 5000,
More preferably, it is 1000-3000. When the number average molecular weight is less than 500, the elongation of the obtained elastic yarn tends to be insufficient, and when it exceeds 6,000,
Mechanical strength such as strength and elastic recovery tends to be insufficient.

Examples of the organic polyisocyanate include aromatic diisocyanates such as 4,4'-diphenylmethane diisocyanate, 1,5 naphthalene diisocyanate, 1,4 phenylene diisocyanate, 2,4 tolylene diisocyanate, and 2,6 tolylene diisocyanate;
m-xylylene diisocyanate, benzylic diisocyanate such as p-xylylene diisocyanate, aliphatic diisocyanate such as hexamethylene diisocyanate,
Alicyclic diisocyanates such as 1,4 cyclohexane diisocyanate, 4,4 'dicyclohexylmethane diisocyanate, and isophorone diisocyanate are exemplified. These may be used alone or as a mixture of two or more.

The low molecular weight diol which is a chain extender includes ethylene glycol, propylene glycol,
1,4 butanediol, 1,6 hexanediol, 1,
4 cyclohexanediol, 1,4 bis (hydroxyethoxy) benzene, 1,3 bis (hydroxyethoxy) benzene, 1,2 bis (hydroxyethoxy) benzene, cyclohexanedimethanol, bis (2hydroxyethyl) terephthalate, bis (2 # (Hydroxyethyl) isophthalate, bis (2hydroxylethyl) phthalate and the like. In the production of the polyurethane polymer used for the polyurethane elastic body of the present invention, a catalyst, an activator, a lubricant, an ultraviolet absorber, a light stabilizer, an antioxidant, an antistatic agent, an antifungal agent and the like which are usually used are used. You may add to the extent which does not impair the effect of this invention.

Next, the above composition is spun from an extrusion nozzle. In the present invention, attention is focused on a crystal region mainly composed of urethane hard segments, and the growth of the crystal in the lateral direction with respect to the fiber axis direction of the region is considered. Suppress, and have a structure by disturbing the orientation to the fiber axis,
The purpose is to develop a soft fit that can be set at a low temperature, and it is desirable to perform melt spinning from this viewpoint. Furthermore, melt spinning has the advantage that it has a high degree of uniformity and that a fine material can be obtained with a single fiber, which is also desirable in terms of working environment and cost.

The spinning apparatus and spinning conditions used for the polyurethane elastic yarn of the present invention can vary depending on the composition of the polyurethane polymer, the thickness of the target fiber, and the like. It is preferable to supply and spin at a spinning temperature of 180 to 240 ° C. and a winding speed of 1000 m / min or less, particularly 600 m / min or less.
Furthermore, in the present invention, focusing on the crystal region mainly composed of urethane hard segments, suppressing the lateral growth of the crystal in the fiber axis direction, and disturbing the orientation with respect to the fiber axis, low temperature setting and soft It is desirable that the environment temperature from the quench to the winding in the spinning cylinder be low to achieve good fit. Particularly, the quench wind is set at 20 ° C. or less, and the yarn temperature at the time of winding is 20 ° C. It is important to keep the temperature below 0 ° C.
It is desirable that the temperature be set to 10 ° C. or higher.

The single fiber fineness of the polyurethane elastic yarn of the present invention is not particularly limited, and can be appropriately set according to the use. Generally, the degree of single fiber is preferably about 5 to 100 denier. The polyurethane elastic yarn may be in the form of a monofilament or a multifilament. In the case of a multifilament, the number of filaments and the total denier are not particularly limited and can be appropriately set. Further, the cross-sectional shape of the polyurethane elastic yarn is not particularly limited, and may be any cross-sectional shape such as a round shape, a square shape, a triangular shape, an elliptical shape, a flat shape, and an array shape. Further, it may be a solid fiber or a hollow fiber.

Next, a mating material to be cross-woven with the polyurethane elastic yarn will be described. The cross-woven material can be any of thermoplastic synthetic fibers, natural fibers and recycled fibers, but in the case of thermoplastic synthetic fibers, any of polyester fibers, polyamide fibers or acrylic fibers,
It is desirable to use cotton, wool or silk for natural fibers, and to use polynosic fibers for regenerated fibers. In particular, cross-weaving and knitting of the above-mentioned polyurethane elastic yarn and wool, silk yarn, acrylic fiber, and the like, which require a low temperature of 150 ° C. or less during heat setting in the dyeing process, are preferable.

These mating materials and polyurethane elastic yarns are cross-knitted. Specifically, in the case of cross-woven weaving, a method of arranging thermoplastic synthetic fibers, natural fibers and regenerated fibers for the warp and polyurethane elastic yarn for the weft is used. Is desirable. In the case of a warp knitted fabric, a method of arranging a polyurethane elastic yarn on a rear reed and a mating material on a front reed is desirable, and in the case of a circular knitting fabric, a method of knitting a polyurethane elastic yarn with a mating material is desirable.

The dyeing process of the stretchable woven or knitted fabric obtained by the above method is performed in a general processing process of greige → relaxation / scouring → pre-setting → dyeing → drying → hand processing → finishing set. However, it is important to select an appropriate processing step temperature condition for the mating material to be knitted with the polyurethane elastic yarn. Particularly, it is suitable for a material which is dyed at a liquid heat of 100 ° C. or less by a dyeing process of wool, silk thread, acrylic fiber or the like, and heat-set at a low temperature of 150 ° C. or less to express a soft feeling.

[0024]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. In addition, various measurements followed the following method.

(Small-angle X-ray scattering measurement) A yarn was skeined, and both ends of about 1,800 bundles were tied to obtain a measurement sample. Photographing was performed using a RAD RC X-ray generator with a point convergent camera at a camera distance of 350 mm and a 30-minute exposure. X
The source is CuKα ray (using Ni filter, wavelength 1.54
18 angstrom) and an output of 40.0 kv.

(Thermal stress measurement method) Seiko Electronic Industry Co., Ltd.
Using a SSC # 5200 apparatus, an initial load of 5 mg per denier was applied to one yarn having a yarn length of 2 cm, and measurement was performed at a heating rate of 20 ° C./min.

(Repeated stress measurement method) JIS L1013
After standing for 24 hours in a room where the temperature and humidity are controlled at 20 ° C. and 65% RH, the yarn length 5c is measured using a tensile tester (Autograph DSS500 manufactured by Shimadzu Corporation).
m, after elongating 300% at a pulling speed of 50 cm / min, immediately pulled back at a pulling speed of 50 cm / min.

(PSD measurement method) Initial length 22.5 cm (L
Drying the polyurethane elastic yarn of 1) under 100% elongation under dry heat 12
After processing at 0 ° C. for 1 minute, the yarn length (L2) after shrinking and cooling at room temperature for 10 minutes was measured and determined by the following formula. PSD (%) = (L2-L1) / L1 × 100

(Measurement of PSW) Initial length 9.5 cm (L
After raising the temperature of the elastic yarn of 3) from 40 ° C. to 105 ° C. for 60 minutes under 100% elongation, the yarn was shrunk and allowed to cool at room temperature for 10 minutes, and the yarn length (L4) was measured and determined by the following equation. . PSD (%) = (L4-L3) / L3 × 100

Example 1 A Shore A hardness of 90 consisting of polybutylene adipate polyol / diphenylmethane diisocyanate / 1,4 butanediol having an NCO / OH ratio of substantially 1 or less.
Is supplied to a spinning apparatus equipped with a single-screw extruder, using a spinneret having a spinning temperature of 220 ° C., a hole diameter of 0.28 mmΦ, and a hole length of 0.56 mm, that is, L / D = 2.0,
The melt spinning is performed under the conditions of a winding speed of 500 m / min.
A denier monofilament was obtained. At this time, the spinning was performed while controlling the environmental temperature from the quench temperature in the spinning cylinder to the winding device at 10 ° C. The contact yarn temperature during winding was 11 ° C. The obtained polyurethane elastic yarn had a breaking strength of 27 g (1.5 g / denier) and a breaking elongation of 410%. Table 1 shows the obtained yarn properties.
Using this yarn, a bare knitted knitted fabric with a polyamide filament was produced. The knitted fabric was relaxed in hot water at 90 ° C for 1 minute, dyed in boiling water at 98 ° C for 40 minutes, dehydrated and dried at 120 ° C, and finished at 140 ° C for 30 seconds. The finished dough exhibited good setting properties. As a result of a sensory test performed by 10 test subjects on the fit and texture of the fabric, 9 out of 10 subjects evaluated that they had a soft fit, and 8 out of 10 subjects had a soft texture.

Example 2 A bare knitted knitted fabric of 30 denier polyurethane elastic yarn described in Example 1 and 75 denier silk-like promix fiber (TOYOBO “Shinon”) was prepared. 90 ° C × 4 for knitted fabric
After relaxing scouring at 0 seconds, pre-setting at 140 ° C. × 30 seconds, dyeing at 98 ° C. × 40 minutes, drying at 120 ° C., and finishing set at 140 ° C. × 30 seconds. The finished dough exhibited good setting without yellowing. A sensory test was conducted by 10 test subjects on the fit and texture of the fabric, and 9 out of 10 subjects evaluated that they had a soft fit and 8 out of 10 had a soft texture.

Example 3 A twisted coated composite yarn (commonly known as Pryarn) was produced from one 40 denier polyurethane elastic yarn described in Example 1 and two wool 1 / 60-count yarns. This yarn was used as the weft of a wool fabric, and the warp was used as a wool 2/60 count twin yarn to produce a stretchable wool fabric. The woven fabric is scoured at 80 ° C. for 30 seconds with a solvent of Perchlen, pre-dried at 130 ° C. for 30 seconds, dyed at 98 ° C. for 45 minutes, dried, shampooed, steamed in a pot, Schrank, and subjected to a post-heating process of felt with a dry heat of 130. ℃ x 30 seconds, steam wet heat 105 ℃ x
Organized and finished in 10 minutes. The finished woolen fabric showed good setting properties with horizontal stretch. A sensory test was conducted by 10 test subjects on the fit and texture of the fabric, and 9 out of 10 subjects evaluated that they had a soft fit and 8 out of 10 had a soft texture.

Comparative Example 1 Shore A hardness of 90 consisting of polybutylene adipate polyol / diphenylmethane diisocyanate / 1,4 butanediol having an NCO / OH ratio of 1 or less.
Is supplied to a spinning apparatus equipped with a single-screw extruder, using a spinneret having a spinning temperature of 220 ° C., a hole diameter of 0.28 mmΦ, and a hole length of 0.56 mm, that is, L / D = 2.0,
The melt spinning is performed under the conditions of a winding speed of 500 m / min.
A denier monofilament was obtained. Quench temperature of 3
The spinning was performed at 0 ° C. without controlling the environmental temperature up to the winding device. At this time, the contact yarn temperature during winding is 40
° C.

The obtained polyurethane elastic yarn has a breaking strength of 27 g (1.5 g / denier) and a breaking elongation of 440%.
Met. Table 1 shows the obtained yarn properties. Using this yarn, a bare knitted knitted fabric with a polyamide filament was produced. The knitted fabric was relaxed in hot water at 90 ° C for 1 minute, dyed in 98 ° C boiling water for 40 minutes, dried at 120 ° C, and finished at 160 ° C for 30 seconds. The finished fabric showed relatively good setting properties. However, when a sensory test was performed by 10 subjects on the fit and texture of the fabric, 2 out of 10 subjects had a soft fit, and Three persons evaluated that they had a soft texture, and the remaining five persons judged that they did not show a soft fit and a soft texture.

Comparative Example 2 A bare knitted knitted fabric of 30 denier polyurethane elastic yarn described in Comparative Example 1 and 75 denier silk-like promix fiber (Toyobo brand "Sinon") was prepared. 90 ° C ×
After relaxing scouring for 40 seconds, pre-setting at 160 ° C. for 30 seconds, dyeing at 98 ° C. for 40 minutes, drying at 120 ° C., and finishing at 160 ° C. for 30 seconds.
The finished dough exhibited good setting properties, but yellowing of the promix fiber due to heat occurred. The fit of the fabric,
When a sensory test was conducted by 10 subjects on the texture, 2 out of 10 subjects had a soft fit.
Three out of the 0 people evaluated that the texture was soft, and the remaining 5 people judged that they did not show a soft fit and a soft texture.

COMPARATIVE EXAMPLE 3 A twist-coated composite yarn (commonly known as Pryarn) was prepared from one 40 denier polyurethane elastic yarn described in Comparative Example 1 and two wool 1 / 60-count yarns. This yarn was used as the weft of a wool fabric, and the warp was used as a wool 2/60 count twin yarn to produce a stretchable wool fabric. The woven fabric is scoured at 80 ° C for 30 seconds with a solvent of Perchlen, pre-dried at 150 ° C for 30 seconds, dyed at 98 ° C for 45 minutes, and dried, shampooed, steamed in a pot, Schrank, and subjected to a post-heating process of felt 160 to dry heat. ℃ × 30 seconds, steam wet heat 115 ℃ ×
Organized and finished in 10 minutes. The finished woolen fabric showed good setting properties with horizontal stretch. When a sensory test was conducted by 10 test subjects on the fit and texture of the fabric, 2 out of 10 subjects had a soft fit, and 3 out of 10 subjects evaluated that they had a soft texture. Five persons judged that they did not show a soft fit and a soft texture.

[0037]

[Table 1]

[0038]

According to the present invention, it has become possible to provide a stretchable woven or knitted fabric which can be set at a low temperature and exhibits a soft fit in products using the same.

Claims (6)

[Claims] 1. A stretchable woven or knitted fabric comprising crosslinked and woven polyurethane elastic yarn and thermoplastic synthetic fiber satisfying the following conditions (1) to (3). (1) The angle formed by the half width of the maximum peak intensity of the azimuth angle scan in small angle X-ray scattering measurement is 60 degrees or more. (2) When the half-value width of the spread in the equator direction of the scattering in the meridian direction in the small angle X-ray scattering measurement is represented by an angle as viewed from the sample, the angle is 2.5 degrees or less. (3) Maximum shrinkage stress peak temperature in thermal stress measurement is 1
35 ° C or less. 2. The stretchable woven or knitted fabric according to claim 1, wherein the thermoplastic synthetic fiber is any one of a polyester fiber, a polyamide fiber and an acrylic fiber. 3. A stretchable woven or knitted fabric characterized by being formed by cross-weaving a polyurethane elastic yarn and a natural fiber satisfying the following conditions (1) to (3). (1) The angle formed by the half width of the maximum peak intensity of the azimuth angle scan in small angle X-ray scattering measurement is 60 degrees or more. (2) When the half-value width of the spread in the equator direction of the scattering in the meridian direction in the small angle X-ray scattering measurement is represented by an angle as viewed from the sample, the angle is 2.5 degrees or less. (3) Maximum shrinkage stress peak temperature in thermal stress measurement is 1
35 ° C or less. 4. The stretchable woven or knitted fabric according to claim 3, wherein the natural fiber is cotton, wool or silk. 5. A stretchable woven / knitted fabric comprising a polyurethane elastic yarn and a recycled fiber satisfying the following conditions (1) to (3): (1) The angle formed by the half width of the maximum peak intensity of the azimuth angle scan in small angle X-ray scattering measurement is 60 degrees or more. (2) When the half-value width of the spread in the equator direction of the scattering in the meridian direction in the small angle X-ray scattering measurement is represented by an angle as viewed from the sample, the angle is 2.5 degrees or less. (3) Maximum shrinkage stress peak temperature in thermal stress measurement is 1
35 ° C or less. 6. The stretchable woven or knitted fabric according to claim 5, wherein the recycled fiber is a polynosic fiber.