JP2002317337A - Combined filament yarn of different shrinkage and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combined filament yarn of different shrinkages capable of sufficiently readily opening and dispersing ultrafine yarns and suitable for obtaining a sueded fabric assuming a uniform surface appearance without a feeling of unevennessses. SOLUTION: This combined filament yarn of the different shrinkages comprises a low-shrinkable yarn which is a sea-island type thick and thin conjugated yarn having 8-72 number of filaments and comprising an island component having 0.04-0.70 dtex single filament fineness of the island component and 0.4-2.5% Uster evenness (U%) in <=1.5 thick/thin ratio and a highly-shrinkable yarn which is a uniform yarn having 1.5-7 dtex single filament fineness and 6-48 number of filaments without unevenness of thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester mixed yarn suitable for obtaining a suede-like fabric having an excellent spreadability and exhibiting a uniform surface appearance, and a method for producing the same.

[0002]

2. Description of the Related Art In order to obtain a fabric having a uniform surface appearance using ultrafine yarn, it is important that the ultrafine yarn is sufficiently opened and no irregularities are formed on the surface of the fabric. However, since the ultrafine yarn has a property that fibers are easily bundled due to its flexibility, the solution has not been achieved to date. For example, Japanese Unexamined Patent Publication No. Hei 4-91249 discloses a method in which a multifilament is excessively supplied while one fiber is mixed to form a slack or a loop, thereby eliminating defects such as uneven alignment, cracks in the ground, and uneven spots. However, in this method, mixed fiber spots and morphological spots are inevitably mixed, and it is difficult to obtain a fabric having a uniform surface appearance when using ultrafine yarn. Also, Japanese Patent Application Laid-Open No. 7-1024
In Japanese Patent No. 36, a method of performing false twisting on an ultra-fine multifilament is employed as a fiber opening means. In such a method, not only the touch originally possessed by the filament disappears, but also a crimped touch is obtained. However, there is a disadvantage that surface disorder due to crimping occurs. Further, JP-A-7-1269
No. 51 proposes a method of blending an ultrafine splitting composite yarn and a high shrinkage yarn. However, in this method, since the properties of the ultrafine yarn remain as they are, the one component is mechanically peeled off or separated with a solvent. As for the ultrafine yarn after eluted, the fibers are easily partially bundled as in the conventional method, and a fabric having an even surface appearance cannot be obtained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made on the background of the above-mentioned prior art, and has as its object to provide a suede in which an ultrafine yarn is easily spread and dispersed sufficiently and has a uniform surface appearance without unevenness. It is an object of the present invention to provide a different shrinkage mixed fiber suitable for obtaining a tough fabric and a method for producing the same.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, have found sea-island type composite yarn having fine unevenness in thickness as low shrinkage yarn and unevenness in thickness as high shrinkage yarn. If yarns having no fibers are mixed, even if each island component of the sea-island composite yarn is formed into an ultrafine yarn after being formed into a fabric, the spread and dispersion of the ultrafine yarn are improved due to the fine unevenness of the thickness, The inventors have learned that a fabric having a uniform surface appearance can be obtained, and have completed the present invention.

[0005] Thus, according to the present invention, "the low shrinkage yarn has 8 to 72 filaments and has the following (1) to (3)
The high-shrink yarn is a uniform yarn having a monofilament fineness of 1.5 to 7 dtex and a filament count of 6 to 48 and having no unevenness in thickness. Different shrinkage mixed fiber. (1) Worcester evenness (U%) is 0.4 to 2.5% (2) Thickness ratio of island component is 1.5 or less (3) Single fineness of island component is 0.04 to 0.70 decitex And "a sea-island composite having 8 to 72 filaments, a natural stretch ratio of 1.8 or less, an elongation of 120 to 200%, and an island component fineness of 0.042 to 0.90 decitex." The yarn is treated at a temperature of 80 to 230 ° C. and 1.05 to 1.3.
Stretched 5 times to make Worcester Evenness (U%) 0.4 ~
2.5% sea-island type thin composite low shrinkage yarn, followed by a single fineness of 1.5 to 7 dtex and a filament number of 6 to
A method for producing a different shrinkage mixed fiber yarn, comprising mixing 48 uniformly high shrinkage yarns having no thickness unevenness. Is provided.

[0006]

Embodiments of the present invention will be described below in detail. First, the low shrinkage yarn of one component constituting the hetero-shrinkage mixed fiber yarn of the present invention is a sea-island type thick and thin composite yarn,
For example, by dissolving and removing sea components in the post-processing stage,
It means that the island component can be made into an ultrafine yarn, and the ultrafine yarn has thick and thin spots in the fiber axis direction. In other words, the cross-sectional shape of the fiber axis is such that the sparingly soluble polymer which is hardly dissolved in the solvent (including the alkaline aqueous solution) is dispersed in the easily soluble polymer in an island shape (substantially continuous in the fiber axis direction). It has the form of doing.

[0007] As described above, the combination of the polymers constituting the composite yarn may be any combination as long as the sea component and the island component have different solubilities in a certain solvent and the island component can be divided into ultrafine yarns. Above all, from the viewpoint of the feeling and handleability of the obtained woven or knitted fabric, the island component is preferably a polyethylene terephthalate-based polyester having ethylene terephthalate of 95 mol% or more, and the sea component is 5-sodium sulfoisophthalic acid, isophthalic acid, Polyethylene glycol, diethylene glycol, adipic acid,
Polyethylene terephthalate-based polyester obtained by copolymerizing cyclohexane dimethanol, tetramethylene glycol or the like at a ratio that makes it more soluble than the polyethylene terephthalate-based polyester, or polyethylene glycol, a polyoxyalkylene glycol component comprising a polycarboxylic acid component and a polyoxyalkylene glycol component A polyester composition which is easily soluble by mixing a polymer such as an ether ester with a polyester such as polyethylene terephthalate is preferred.

Next, the Worcester evenness (U%) of the sea-island type thick and thin composite yarn is a value measured before removing the sea component, and the value is 0.4 to 2.5%. , Preferably in the range of 0.5 to 1.5%. 0.
If it is less than 4%, the spreadability between the ultrafine yarns after the ultrafine yarn formation is reduced, and it is not possible to obtain a fabric having a uniform surface appearance which is the object of the present invention. on the other hand,
If it exceeds 2.5%, thick and fine spots of extra-fine yarn become conspicuous and the unevenness of the fabric becomes large, so that a uniform appearance cannot be obtained.

[0009] The thick and thin spots in the fiber axis direction of the ultrafine yarn are as follows:
The diameter ratio needs to be 1.5 or less, preferably 1.3 or less, and when the ratio exceeds 1.5, a gloss difference between thick and thin is generated, so that streaks easily occur. This is not preferred because the uniformity is impaired.

The fineness of the ultrafine yarn is 0.04 to 0.04.
0.70 decitex, preferably 0.05-0.40
It is necessary to be in the range of decitex, and if it is less than 0.04 decitex, it is difficult to open the gap between the ultrafine yarns according to the present invention, and it is not preferable because a uniform surface appearance cannot be obtained. On the other hand, when it exceeds 0.70 decitex, it is possible to open the single fiber sufficiently, but it is not possible to obtain a suede-like fabric. In addition, the island diameter of the island component in the sea-island type conjugate fiber is 1.5 at the maximum, preferably 1.0 when the thick portion or the detail is compared, except for the thick and thin spots in the fiber axis direction. It is preferably 2 or less, particularly preferably substantially uniform, to obtain a uniform surface appearance.

The elongation of the sea-island type thick and thin composite yarn is 80
In the case of such a composite yarn, the orientation of the ultrafine yarn obtained by dissolving and removing the sea component is appropriate, so that the mechanical characteristics of the ultrafine yarn can be maintained. A suede-like fabric excellent in soft touch is obtained, which is preferable.

[0012] Next, whether the number of filaments of the sea-island type thick and thin composite yarn in the hetero-shrink mixed yarn of the present invention is too large or too small, the uniform mixing property at the time of blending with the uniform yarn described later is insufficient. Therefore, it is necessary to set the range to 8 to 72, especially 16 to 60.

The other high shrinkage yarn constituting the hetero-shrinkage mixed fiber yarn of the present invention is a uniform yarn having no unevenness in thickness, and has a single fineness of 1.5 to 7.0 decitex, preferably 2 .
It must be in the range of 0-5.0 dtex. When the high shrinkage yarn has unevenness in thickness, the uniformity is reduced due to the unevenness of the high shrinkage yarn, and the object of the present invention cannot be achieved. The term "having no thickness unevenness" as used herein refers to a multifilament that is not conscious of a normal flat and thin shape, and has a Worcester evenness (U%) that the normal multifilament has. Needless to say, it may have a thickness unevenness of about 0.2% or less.

When the single fineness is less than 1.5 decitex, the entanglement between the fibers due to the blending becomes strong, and the opening property of the ultrafine yarn formed by treating the composite yarn is reduced. Thus, it is not possible to obtain a fabric having a uniform surface appearance. On the other hand, when it exceeds 7.0 decitex, the fiber mixing property with the composite yarn is reduced and the fiber mixing becomes poor,
Similarly, a fabric having a uniform surface appearance cannot be obtained.

The number of filaments of the uniform yarn is 6 to 48.
Book, preferably in the range of 12 to 36,
When the number is less than 6, the effect of dispersing the filaments of the sea-island type thick and thin composite yarn is reduced, and when the number is more than 48, the entangled portion becomes too large, which results in a block-like form. Are formed in places, so that a uniform surface appearance cannot be obtained. In addition, the total number of filaments of the sea-island type thick and thin composite yarn and the uniform yarn is 120 or less, preferably 72 or less, because if it is too large, some filaments will be disturbed due to mixed fiber disorder and will not exhibit a uniform surface appearance. In addition, it is desirable that the number of filaments of the sea-island type thick and thin composite yarn is 4 times or less, preferably 3.5 times or less of the number of filaments of the uniform yarn.

The polymer constituting such a high shrinkage yarn is obtained as long as the heat shrinkage is higher than that of the low shrinkage yarn, for example, the boiling water shrinkage is preferably not less than 5%, although there is no particular limitation. Polyester from the texture of the fabric,
Particularly, polyethylene terephthalate obtained by copolymerizing the third component is preferable. Of course, it is needless to say that the polyester needs to be less soluble than the polyester preferably used for the sea component of the sea-island type thick and thin composite yarn. Preferred examples of the third component include isophthalic acid, bisphenol A and its ethylene oxide adduct, neopentyl glycol, and the like. The copolymerization amount is usually 2 mol% in order to exhibit high shrinkage characteristics. The upper limit is usually 20 mol% or less from the viewpoint of the feeling and mechanical properties of the obtained fabric.

Next, a preferred method for producing the above-described hetero-shrinkage mixed fiber yarn will be described. First, the number of filaments was 8 to 72, preferably 12 to 60, and the natural stretching ratio was 1.8, which was obtained by compound spinning using a readily soluble polymer as a sea component and a polymer having a slower dissolution rate as an island component. Below, preferably 1.2 to 1.6, elongation is 120
A sea-island composite undrawn yarn having a single fineness of 0.042 to 0.90 dtex, preferably 0.05 to 0.40 dtex, is used.

If the elongation of the outer unstretched yarn is less than 120%, thick and thin spots cannot be formed on the island component even when the spot stretching described below is performed, and the yarn is formed by dissolution treatment. The opening property of the ultrafine yarn becomes insufficient. 200
%, The Worcester evenness (U%) expressed by the mottling stretching becomes too large, the fine mottling of extra-fine yarn becomes conspicuous, and the unevenness of the fabric also increases, resulting in a uniform appearance. Is not preferred because it is no longer possible to obtain

Next, the higher the natural drawing ratio of the undrawn yarn, the more
The width of the stretching for forming the spots increases, and a wide variety of spots can be formed. On the contrary, abnormal stretching spots are likely to occur. This stretch unevenness is less likely to occur as the natural stretch ratio is smaller, but conversely, if it is smaller, the stability at the time of forming the thin and thick object aimed at in the present invention is reduced, so in the present invention, the natural stretch ratio is 1.8 or less is required, and it is preferably in the range of 1.2 to 1.6 times. Within this range, the sea-island thick and thin composite yarn according to the present invention can be obtained by spot stretching described below.

In the present invention, the undrawn yarn is treated at a temperature of 8
0 to 230 ° C, preferably 1.05 to 110 to 210 ° C.
Stretched to 1.35 times, preferably 1.10 to 1.25 times (spot stretching) to give a Worcester evenness (U%) of 0.4 to
A 2.5% sea-island type thick and thin composite yarn is formed. Here, when the stretching temperature is lower than 80 ° C., not only irregular spots are liable to be generated but also the Worcester evenness becomes too large, which is not preferable. On the other hand, when the temperature is higher than 230 ° C., it is not preferable because it is difficult to stretch stably due to overheating.

It is preferable to adjust the heat treatment time so that the temperature applied to the yarn being drawn matches the temperature of the heating element. If the adjustment can be performed, not only the contact type heating element but also the non-contact type heating element can be used. Can be used. When stretching is performed with a non-contact heating body, the heating roller is preliminarily heated by making several turns on a heating roller (the heating roller temperature is preferably 90 ° C. to 130 ° C.). It is preferable to perform the stretching, and if the stretching is performed only by the non-contact heating body, stretching unevenness is likely to occur. A more preferred stretching method is a heating roller and a heating plate (contact)
In this case, the heating roller temperature is 90 ° C.
Preferably, the heating plate temperature is lower than when the heating plate is used alone.

If the draw ratio is less than 1.05, thick and thin island components (extremely thin yarns) cannot be formed. If the draw ratio is more than 1.35, the spots become too clear to make the wool eve. Ness (U%) is not preferable because it exceeds 2.5%.

The sea-island type thick and thin composite yarn obtained by the above-described method has a single fineness of 1.5 to 1.5 produced by a conventional method.
The fibers are mixed with a uniform high shrinkage yarn having a thickness of 6 to 48 and having no unevenness in filaments to form a different shrinkage mixed yarn. As the fiber mixing method, a conventionally known method may be adopted,
For example, it is general and preferable to use an interlace nozzle.

Hereinafter, a more specific description will be given with reference to the drawings. FIG. 2 is a schematic view of a process for producing a different shrinkage mixed fiber of the present invention. In the figure, the sea-island composite undrawn yarn (1) is placed on a krill stand in the manufacturing process, and the uniform yarn (2) having no thickness unevenness is placed on another krill stand. The sea-island composite undrawn yarn is passed through a cott roller (3) and made to turn several times on a supply roller (4). After that, uneven stretching and heat treatment are performed simultaneously between the large-diameter rollers with the stepped roller (6), and the uneven yarn is guided to the interlace nozzle (7) before entering the small roller. After a few turns of guiding, the two yarns are aligned in front of the nozzle (7), compressed air is supplied to the nozzle, and the fibers are mixed. .

FIG. 3 is a schematic view showing another process for producing the different shrinkage mixed fiber of the present invention. Here, the sea-island composite undrawn yarn (1-1) is set on the krill stand, while the uniform yarn (2
-1) is placed on another krill stand. The non-stretched sea-island composite yarn is passed through a cott roller (3-1) and is turned several times on a heating roller (4-1). After passing through (5-1), uneven stretching and heat treatment are simultaneously performed between the large-diameter rollers with the stepped roller (6-1), and are guided to the interlace nozzle (7-1) before entering the small roller.
The uniform yarn is also guided to the large-diameter roller of the stepped roller, and after several turns,
Before the nozzle (7-1), the two yarns are aligned and compressed air is supplied to the nozzle to mix the fibers. Then, the yarn is wound several times on a small-diameter roller to form a differently shrink mixed yarn (8-1).

FIG. 4 is a schematic view of another process for producing the hetero-shrinkage mixed fiber yarn of the present invention. Here, the sea-island composite undrawn yarn (1-2) is placed on a krill stand, while the uniform yarn (2-2) is placed on another krill stand. The unstretched sea-island composite yarn is passed through a cott roller (3-2) and made to turn on a heating roller (4-2) for a few turns. -2), uneven stretching and heat treatment are performed simultaneously between the large-diameter rollers with the stepped roller (6-2), and the roller is guided to the interlace nozzle (7-2) before entering the small roller. After a few turns, the yarn is guided to the large-diameter roller of the stepped roller, the two yarns are aligned before the nozzle (7-2), compressed air is supplied to the nozzle and mixed, and then several turns to the small-diameter roller. It winds up as a different shrinkage mixed fiber (8-2).

[0027]

EXAMPLES The present invention will be described below more specifically with reference to examples. In addition, each measurement item in an Example was measured by the following method.

Worcester Evenness (U%) Using a Worcester Evenness (U%) measuring machine manufactured by Nippon Keiso Co., Ltd., the measurement was performed at a yarn speed of 100 m / min, half inert, and a false twist number of 5,500 times / min.

Boiling water shrinkage ratio The sample was skeined 10 times using a measuring machine having a frame circumference of 1.125 m, and was subjected to 0.0177 cN / dtex (0.02 g / d
e) Load the skein with a skein and measure the skein length L ₀ , then remove the load, immerse in 98 ° C. warm water for 30 minutes, take out, cut off moisture with Japanese paper, air dry in a horizontal state, and again measure the skein length L ₁ under a load was calculated boiling water shrinkage from the following formula (%). Boiling water shrinkage (%) = ((L ₀ −L ₁ ) / L ₀ ) × 100

Thickness ratio of island component (ultrafine yarn) All the filaments constituting the sea-island type thick composite yarn are treated with an alkaline solution to completely dissolve the sea component to make only the ultrafine yarn (island component). The diameter of the thick part and the fine part is measured with an optical microscope for the ultrafine yarn, and the ratio is calculated (average of n10).
did. Regarding the fineness distribution of the island component, for the composite yarn before spot drawing, all the filaments were treated with an alkaline solution to completely dissolve the sea component, leaving only the ultrafine yarn (island component) and embedding in paraffin. Make sections with a microtome. This is measured with an optical microscope, the diameter of each cross section is measured, and the maximum diameter and the minimum diameter are selected. This operation was repeated five times from the beginning, and the maximum diameter and the minimum diameter of the five times were further extracted, respectively, and the maximum diameter was divided by the minimum diameter to obtain a fineness distribution.

Example 1 As an island component of a sea-island type composite yarn,
Polyethylene terephthalate (intrinsic viscosity: 0.63) containing 0.3 wt% of titanium oxide, 5 as an easily soluble sea component
-Polyethylene terephthalate (intrinsic viscosity 0.63) obtained by copolymerizing 1.5 mol% of sodium sulfoisophthalic acid and 1.5 wt% of polyethylene glycol (molecular weight 4000), and polyethylene glycol molecular weight 2000
0 and 4 wt% of a water-soluble polyetherester (a polymer of phthalic acid / polyethylene glycol (molecular weight: 20,000), molecular weight: 150,000) are blended, and the island and sea components are simultaneously fed from a normal composite spinneret. Spinning was performed to obtain a sea-island composite undrawn yarn having a cross-sectional shape shown in FIG. At this time, the spinning temperature was 290 ° C., the spinning speed was 3000 m / min, the total fineness was 133 dtex, and the number of filaments was 36.
The number of islands in this filament was 25, the weight ratio of the island component was 65% (the single fineness of the island component was 0.10 decitex),
An undrawn yarn having a sea component of 35%, a tensile elongation at break of 160%, and a natural draw ratio of 1.6 was obtained.

The composite undrawn yarn is subjected to the manufacturing process shown in FIG. 2, and the drawing conditions are as follows: the drawing ratio between the supply roller and the stepped roller is 1.15 times, and the heating plate (heater length is 36 cm). Temperature is 200 ° C and stretching speed is 400m
/ Min. On the other hand, for a uniform yarn, undrawn yarn obtained by spinning polyethylene terephthalate obtained by copolymerizing 10% by mole of isophthalic acid at a spinning temperature of 280 ° C. and a spinning speed of 1450 m / min is turned 6 times on a heating roller at 87 ° C., and a drawing roller temperature of 120 ° C. And a three-fold stretch, and a high shrinkage uniform yarn having a boiling water shrinkage of 15% and 55 dtex / 12 filaments was used.

Both yarns are aligned on a stepped roller, and compressed air pressure of 196 k using the interlace nozzle of the same process.
172d after mixing at Pa (2kg / cm ² ) and 2% relaxation
A tex / 48 filament (155 de / 48 filament) hetero-shrink mixed fiber was obtained. In addition, when the sea-island composite undrawn yarn is stretched independently under the same conditions as above, and the physical properties are observed,
117 dtex (at 105) / 36 filaments, elongation 110%, U% 0.6%, ratio of small to large diameter of island component is 1.
It was 3.

The blended yarn was used as a warp and a weft, and the warp was S-twisted 600 times and the weft was SZ-twisted 1000 times, and woven with a twill change structure. The obtained greige is 100 ° C
1% in the longitudinal direction and 5% in the weft (width) direction using a pin tenter device as a preset
At 180 ° C. for 30 seconds. Then
After reducing the weight of the sea component by 30% with a 35 g / liter sodium hydroxide aqueous solution at 90 ° C. to dissolve the sea component and dividing the island component into ultrafine yarn, ordinary high-pressure dyeing (130 ° C. for 45 minutes)
With a beige color. The shrinkage ratio of the woven fabric before and after dyeing is 3% in the warp direction and 5% in the weft (width) direction, and this shrinkage is due to the shrinkage force of the uniform yarn. Was difficult to observe.
Thereafter, the fabric was air-dried and set as a final set by drying at 160 ° C. for 1 minute to finish the fabric. 220g fabric weight
/ M 2, the finished weave density was 288 warps / 25.4 mm, weft 155 warps / 25.4 mm. The woven fabric exhibited a uniform surface appearance, and the ultrafine yarn did not adhere to the group as a whole, resulting in a suede-like woven fabric having a sufficient opening effect. As an additional process, the fabric is buffed (winding a # 400 sandpaper around a rotating shaft and cutting the fibers to make fluff while moving the fabric surface so as to make slight contact on the surface), thereby smoothing the fabric. The result is a softer texture.

Example 2 The sea-island composite undrawn yarn and the uniform yarn used in Example 1 were heated using the apparatus shown in FIG. 3 at a heating roller temperature of 120 ° C. and a draw ratio of 1.15 as in Example 1.
A non-shrinkable mixed fiber was obtained under the same conditions as in Example 1 except that the temperature of the non-contact heating element (slit type) was 220 ° C.
When the sea-island composite yarn alone is drawn under the same conditions as above and the physical properties are examined, 117 dtex (105 de) / 36 filaments, elongation is 115%, U% is 0.5%, and the thickness ratio of the island component is 1.2.

The mixed fiber was subjected to weaving and dyeing in the same manner as in Example 1 to obtain a finished product. Fabric weight 230g /
m ² , the finish weave density is 229 warps / 25.4 mm, weft 15
7 pieces / 25.4 mm, which is almost the same as Example 1. The woven fabric exhibited an even surface appearance, and the fine fibers did not adhere to each other in a group. As an additional process, the fabric is buffed (winding a # 400 sandpaper around a rotating shaft and cutting the fibers to make fluff while moving the fabric surface so as to make slight contact on the surface), thereby smoothing the fabric. The result is a softer texture.

Comparative Example 1 The same spinning method as in Example 1 was used to obtain a sea-island composite undrawn yarn having a total fineness of 133 dtex.
(120de), 36 filaments, 25 islands, 65% island component weight ratio, 35% sea component, 1 tensile elongation at break
An undrawn yarn having a draw ratio of 60% and a natural draw ratio of 1.6 was obtained. This unstretched yarn was stretched 1.15 times using a device shown in FIG.
tex (105 de) / 36 filament, U% 3.0
%, The same uniform yarn as in Example 1 was mixed in the same manner to obtain a 172 detx (155 de) / 48 filament hetero-shrink mixed yarn.

This mixed yarn was used for warp and weft, and the warp was twisted 600 times in S and the weft 1000 times in SZ, and woven in a twill change structure. The obtained green fabric was dyed and finished in the same manner as in Example 1 to obtain a woven fabric. The surface of the woven fabric has an uneven appearance, and it cannot be said to be a uniform surface appearance. Was.

Comparative Example 2 Example 1 The same spinneret and polymer were used, and 198 dtex (178 d
e) A sea-island composite undrawn yarn of / 36 filaments was obtained, and then drawn at a draw ratio of 1.7 times on a heating plate at 160 ° C. to give a drawing with a U% of 0.2% without thick and thin spots.
A sea-island composite yarn of dtex (105 de) / 36 filament was obtained. This composite yarn was blended with the same uniform yarn as in Example 1 in the same manner as in Example 1, and 172 dtex (155 d
e) It was made into a mixed fiber of / 48 filaments. Thereafter, the woven fabric was finished in the same manner as in Example 1. However, in the obtained woven fabric, extra-fine yarns were sometimes bundled together, and morphological portions such as a brush tip were scattered at various places, and it could not be said that the fabric was uniform.

[0040]

According to the hetero-shrinkage mixed fiber yarn of the present invention, a suede-like fabric having a uniform surface appearance that emphasizes the uniformity of a synthetic fiber rather than reproducing the natural spots of the natural fiber is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a sea-island composite yarn according to the present invention.

FIG. 2 is a schematic view showing a process for producing the different shrinkage mixed fiber yarn of the present invention.

FIG. 3 is a schematic view showing another process for producing the different shrinkage mixed fiber of the present invention.

FIG. 4 is a schematic view showing still another step for producing the hetero-shrinkage mixed fiber of the present invention.

[Explanation of symbols]

 A island component B sea component 1,1-1,1-2 Sea-island type composite yarn 2,2-1,2-2 Uniform yarn without thickness unevenness 3,3-1,3-2 Cot roller 4,4 -1,4-2 supply roller 5,5-1,5-2 heating plate 6,6-1,6-2 stepped roller 7,7-1,7-2 interlace nozzle 8,8-1,8- 2 Different shrinkage mixed fiber

Continued on the front page (72) Inventor Tomio Mizumura 77 Kitayoshida-cho, Matsuyama-shi, Ehime Prefecture Teijin Limited Matsuyama Works F-term (reference) 4L036 MA05 MA16 MA33 MA39 PA01 PA03 PA33 PA46 RA03 UA25

Claims (4)

[Claims] The low-shrink yarn is a sea-island type thick and thin composite yarn having 8 to 72 filaments and simultaneously satisfying the following (1) to (3), and the high-shrink yarn is a single fiber fineness of 1.5. A non-shrinkable mixed yarn comprising a uniform yarn having a thickness of 6 to 48 decitex and a filament number of 6 to 48 and having no unevenness. (1) Worcester evenness (U%) is 0.4 to 2.5% (2) Thickness ratio of island component is 1.5 or less (3) Single fineness of island component is 0.04 to 0.70 decitex 2. The sea-island type thick and thin composite yarn has an elongation of 80 to 180.
%. 3. The hetero-shrink mixed yarn according to claim 1, wherein the polymer constituting the sea-island type thick and thin composite yarn and the uniform yarn is polyester. 4. A sea-island composite yarn having a filament count of 8 to 72, a natural draw ratio of 1.8 or less, an elongation of 120 to 200%, and an island component fineness of 0.042 to 0.90 decitex, The film is stretched 1.05 to 1.35 times at a temperature of 80 to 230 ° C. to have a Worcester evenness (U%) of 0.4 to 2.5.
% Of the sea-island type thick and thin composite low shrinkage yarn, followed by a single fiber fineness of 1.5 to 7 dtex and a filament number of 6 to 4
A method for producing a different shrinkage mixed fiber yarn, wherein the fiber is mixed with eight uniform high shrinkage yarns having no thickness unevenness.