JP2008196093A - Combined filament yarn with uneven elongation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined filament yarn with uneven elongation capable of forming a fabric which is excellent in touch feeling including puffy touch, soft touch and resilient touch and has unique appearance such as color deepness. <P>SOLUTION: The combined filament yarn with uneven elongation comprises low-elongation yarn A and high-elongation yarn B, meeting the following requirements (1) to (5): (1) The low-elongation yarn A is a high-shrinkage copolyester yarn. (2) The high-elongation yarn B is a low-shrinkage sheath/core yarn, wherein the sheath consists of a polyester containing a surface modifier and the core consists of polystyrene. (3) The difference of elongation at break meets the relationship: 20%≤DE(B)-DE(A)≤70%. (4) The boiling water shrinkage difference meets the relationship: 7%≤BWS(A)-BWS(B)≤13%. (5) The single filament fineness difference meets the relationship: 2.0≤D(A)/D(B)≤5.0. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a differential elongation mixed yarn that can provide a fabric having excellent texture such as swell, softness, and rebound, and excellent deep color.

  Conventionally, aromatic polyester fibers such as polyethylene terephthalate are widely used mainly for clothing because they are excellent in mechanical properties and various fastnesses. In clothing applications, quality has been improved with natural materials as the target, and various forms that approximate natural fibers such as silk and wool can be produced at low cost by changing the polymer type and additives. Can be provided.

  In particular, so-called shrinkage difference blended yarns, in which yarns having different shrinkage characteristics due to heat are blended, are widely used as means for realizing a swelled and soft feeling. There are two types of blending methods: two or more types of polyester unstretched yarns that have shrinkage differences from each other are spun in a separate process and blended at the time of stretching or after stretching, so-called post-mixing and spinning or winding. There are two methods of so-called spinning blending that blends in stages.

  Post-mixing involves spinning at least two or more undrawn yarns in a separate process, so it can be used in a wide range of applications and can be produced stably. However, the productivity is greatly inferior, and the cost is much higher than spinning. It lacked practicality.

  On the other hand, the spinning blend is a blending method that can reduce the cost, which is a drawback of the post-mixing, and is more practical than the post-mixing. However, the use is limited to that extent, but in recent years, with the development of polyester production methods, it has become possible to produce blended yarns stably even by the spinning blending method.

  As an example, in Patent Document 1, homopolyethylene terephthalate is used as a low shrinkage component, copolyester is used using a copolyester as a high shrinkage component, an unstretched yarn is once wound and then stretched. A simple method for producing a polyester shrinkage difference mixed yarn is disclosed.

  Furthermore, in Patent Document 2, a copolyester single yarn exhibiting high shrinkage and a spontaneous stretch yarn, which is a core-sheath yarn in which polyester is arranged in the sheath and polystyrene-based polymer is arranged in the core, A method of spinning more simultaneously is disclosed. If this method is used, the core-sheath yarn side becomes low shrinkage due to the orientation-inhibiting effect of the polystyrene-based polymer, and a fabric excellent in swelling and soft feeling can be obtained.

  However, the yarn obtained by this method is liable to generate loops and fluff due to the spontaneously elongated yarn, has poor unraveling properties and process passability, and has insufficient dyeability.

  By the way, as described above, polyester fiber is excellent in mechanical properties and various fastnesses, but is inferior in coloring property of dyed cloth compared to natural fibers such as silk and wool, and also because of the smoothness of the fiber surface. It has a specific mirror gloss and has the disadvantage that a color depth similar to that of natural fibers cannot be obtained. In particular, since the depth of black is significantly inferior to natural fibers, improvement in black color development is strongly desired in the black formal field and the like.

  As means for solving such a problem, Patent Document 3 proposes a mixed yarn composed of two or more types of filaments containing inorganic fine particles, although black color developability is sufficient. When blended yarn is manufactured, two or more types of filaments containing inorganic fine particles are blended, resulting in large shaving of guides and the like, poor process stability, and fabric swell, softness, and rebound. Was insufficient.

In other words, the conventional techniques cannot achieve both a texture such as a swell feeling, a soft feeling, and a resilience feeling and a high black color developability.
JP 02-019528 A (Claims) JP 2001-003234 A (Claims) JP 2001-200388 A (Claims)

  An object of the present invention is to solve the above-mentioned problems, and an elongation difference mixed yarn capable of forming a fabric excellent in texture such as bulging feeling, soft feeling and repulsion, and further excellent in deep color. It is to provide.

In order to solve the above problems, the present invention employs the following configuration. That is, an elongation difference mixed yarn composed of a low elongation yarn A and a high elongation yarn B, which satisfies the following (1) to (5).
(1) The low elongation yarn A is made of a copolyester exhibiting high shrinkage.
(2) The high elongation yarn B is a core-sheath yarn that exhibits low shrinkage, and is a core-sheath yarn in which a polyester containing a surface modifier is disposed in the sheath and a polystyrene polymer is disposed in the core. thing.
(3) 20% ≦ DE (B) −DE (A) ≦ 70%
(4) 7% ≦ BWS (A) −BWS (B) ≦ 13%
(5) 2.0 ≦ D (A) / D (B) ≦ 5.0
DE (A): Breaking elongation of low elongation yarn A DE (B): Breaking elongation BWS of high elongation yarn B (A): Boiling water shrinkage BWS (B) of low elongation yarn A: High elongation Boiling water shrinkage ratio D (A) of single yarn B: Single yarn fineness of low elongation yarn A D (B): Single yarn fineness of high elongation yarn B

  ADVANTAGE OF THE INVENTION According to this invention, the fabric excellent in textures, such as a swell feeling, a soft feeling, and a repulsion feeling, and also excellent in deep color can be provided.

  The present invention is described in further detail below.

  Examples of the polyester used in the present invention include polyethylene terephthalate (hereinafter abbreviated as PET), polytrimethylene terephthalate, polybutylene terephthalate, and the like. PET is the most versatile and preferable. Moreover, these may contain additives, such as a matting agent, a flame retardant, an antistatic agent, and a pigment.

  The elongation difference mixed fiber of the present invention is made of polyester in which the low elongation yarn A is copolymerized with a third component exhibiting high shrinkage, and the high elongation yarn B contains a surface modifier in the sheath. It is composed of a core-sheath composite yarn in which polyester is disposed and a polystyrene polymer is disposed in the core.

  It is important that the low elongation yarn A is formed from a polyester in which a third component exhibiting high shrinkage is copolymerized. By using the polyester copolymerized with the third component, the heat shrinkability is improved, the shrinkage difference from the high elongation yarn B is increased, and the feeling of swelling of the fabric is improved. As the third component, it is preferable to employ isophthalic acid (hereinafter abbreviated as IPA). When the copolymerization ratio of IPA is 3 to 12 mol%, sufficiently contractile fibers can be obtained. In addition to IPA, when 2,2bis {4- (2-hydroxyethoxy) phenyl} propane (hereinafter abbreviated as BHPP) is copolymerized at a copolymerization rate of 1 to 5 mol%, higher shrinkage can be achieved. .

  It is important that the high elongation yarn B is a core-sheath composite yarn in which a polyester containing a surface modifier is disposed in the sheath and a polystyrene polymer is disposed in the core. By arranging the polystyrene polymer in the core, an effect of suppressing the orientation can be obtained, the high elongation yarn B can be further contracted, the difference in contraction from the low elongation yarn A is expanded, and the feeling of swelling of the fabric is improved. . In addition, since the initial Young's modulus is smaller than that of a yarn composed of a single polyester yarn, and the bending rigidity is also reduced, a soft and supple texture can be expressed when a woven or knitted fabric is formed.

  In the present invention, it is important that the surface modifier is contained in the sheath polyester of the high elongation yarn B. The average primary particle size of the surface modifier is preferably 0.02 to 0.1 μm. When the average primary particle size is in the range of 0.02 to 0.1 μm, a sufficient surface modification effect is obtained, the dyeability is good, and sufficient cutting strength is maintained. It is possible to stretch. More preferably, it is 0.03-0.09 micrometer.

  Further, the content of the surface modifier contained in the sheath part of the high elongation yarn B is preferably 0.4 to 5% by weight with respect to the sheath polymer. When the content of the surface modifier is in the range of 0.4 to 5% by weight, sufficient surface modification effect is obtained, deep color is good, sufficient light resistance and heat resistance are obtained, and the process passes. Since the property is also good, the yarn breakage can be suppressed. More preferably, it is 1 to 4% by weight.

  Any type of surface modifier can be used as long as it does not substantially deteriorate polyester and is excellent in stability by itself. Typical examples of such inorganic fine particles include inorganic fine particles such as silica, alumina, titanium oxide, calcium carbonate, and barium sulfate. Among these, silica is preferable from the viewpoint of improving color developability, and the form of silica is as follows. Colloidal silica with good dispersibility is most preferred.

  The colloidal silica as used in the present invention refers to a material in which silicon oxide is a main component, and fine particles existing in a single particle form are present as a colloid using water, a monovalent alcohol or diol, or a mixture thereof as a dispersion medium.

  As a method for adding the colloidal silica to the polymer, a method in which the colloidal silica is added in a slurry in which the colloidal silica is well dispersed in ethylene glycol is preferable. The addition timing of the slurry may be any timing of esterification of the polyester, transesterification reaction or polycondensation reaction, and can be appropriately selected.

  In the high elongation yarn B, it is important that the core polystyrene polymer is not exposed on the fiber surface. As long as this is satisfied, the core-sheath composite form may be a concentric circle or a concentric circle, although it is preferable that the core-core composite form is concentric considering the composite stability.

  The viscosity of the core polystyrene polymer is in the range of 3.0 to 10.0 g / 10 min in terms of melt mass flow rate (hereinafter abbreviated as MFR, indicating that the smaller the value, the higher the viscosity). This is preferable because the composite stability is good.

  When the composite ratio of the core polystyrene polymer to the entire core-sheath composite yarn is 7 to 20% by weight, a sufficient effect of suppressing the orientation can be obtained, and the yarn can be stably spun with little yarn breakage. More preferably, it is 8 to 15% by weight.

  In the present invention, it is important that the single yarn fineness ratio {D (A) / D (B)} of the low elongation yarn A and the high elongation yarn B is 2.0 to 5.0. When it is less than 2.0, the micro-loop of the high elongation yarn B is reduced when the fabric is used, and the soft feeling and the bulging feeling are insufficient. On the other hand, if it exceeds 5.0, the yarn-forming property is lowered, and when it is made into a fabric, a rough feeling appears and good deep colorability cannot be obtained. More preferably, it is 2.0-3.5. In addition, the fineness said by this invention means the fineness after extending | stretching and heat processing.

  In the present invention, the low-elongation yarn A and the high-elongation yarn B can have a dry touch when the cross-sectional shape of the low-elongation yarn A and the high-elongation yarn B is an irregular cross-sectional shape such as a trilobal cross section, a square cross section, or a multi-leaf cross section.

  As for the single yarn fineness range, if the single yarn fineness ratio {D (A) / D (B)} of the low elongation yarn A and the high elongation yarn B is in the range of 2.0 to 5.0, general clothing. When used as a low elongation yarn A, it is preferable that the low elongation yarn A is 2.0 to 6.0 dtex and the high elongation yarn B is 0.5 to 2.0 dtex because excellent process stability is obtained. Moreover, if the total fineness is 30-110 dtex, the fabric excellent in the lightweight feeling will be obtained when it is set as a fabric, and it is preferable.

  In the present invention, it is important that the difference in elongation between the low elongation yarn A and the high elongation yarn B is in the range of 20 to 70%. If the elongation difference between the low elongation yarn A and the high elongation yarn B is less than 20%, a sufficient yarn length difference cannot be obtained, and the softness and deep colorability when used as a fabric are poor, exceeding 70%. In addition, the process passability is poor and the feeling of swelling and rebound when used as a fabric is insufficient, and a satisfactory texture cannot be obtained. More preferably, it is 30-60%, More preferably, it is 35-55%.

  In the present invention, it is important that the difference in boiling water shrinkage {BWS (A) -BWS (B)} between the low elongation yarn A and the high elongation yarn B is 7 to 13%. When the difference in boiling water shrinkage between the low elongation yarn A and the high elongation yarn B is less than 7%, the crimp generated during the process of refining (wet heat relaxation treatment) of the fabric is reduced, the rebound feeling is low, and the deep color However, if it exceeds 13%, the crimp becomes large, and unevenness due to wrinkles and stripes and dyeing spots are generated on the surface of the fabric, and a satisfactory texture cannot be obtained. More preferably, it is 8 to 12%.

Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the measuring method in an Example used the following method.
(1) Melt mass flow rate (MFR)
According to JIS K7210 (1999), measurement was performed at 200 ° C. under a load of 5 kg.
(2) Fineness Using a measuring instrument capable of winding 1 m per rotation, the weight of the yarn wound 100 times was measured, and the value was multiplied by 100 to obtain the fineness (dtex).
(3) Elongation at break (DE)
The initial sample length was 20 cm, the pulling rate was 20 cm / min, a load-elongation curve was obtained under the conditions shown in JIS L1013, and the elongation at break of the polyester fiber was divided by the initial sample length to obtain the breaking elongation.
(4) Boiling water shrinkage (BWS)
BWS (%) = [(L ₀ −L ₁ ) / L ₀ ] × 100
L ₀ : Original length of skein measured by staking drawn yarn under initial load of 0.03 cN / dtex (0.03 gf / d) L ₁ : skein measured by L ₀ in boiling water in a load-free state Treated for 15 minutes, air-dried, and then skein length under initial load of 0.03 cN / dtex (0.03 gf / d) (5) Evaluation of yarn production 1 ton of different-strength blended yarn is spun on a 4-spindle spinning machine After winding up to 6 kg, the yield when stretched to 3 kg was judged according to the following criteria.
◯: Yield 95% or more ◯: Yield 90% or more and less than 95% ×: Yield less than 90% (6) Processing process passability The obtained differential elongation mixed yarn was subjected to S twist with a twist coefficient of 2600. Using the warp and weft as a plain weave, a width of 112 cm and a length of 200 m were woven, and the number of yarn breakage at that time was judged according to the following criteria.
○: Yarn break 0 times ○: Yarn break 1 to 2 times ×: Yarn break 3 or more times (7) Texture S-twist with a twist coefficient of 2600 is applied to the obtained differential elongation mixed yarn and used for warp and weft A plain weave was woven and refined at 98 ° C. Thereafter, an intermediate set is performed at 180 ° C., and a fabric subjected to 20% alkali weight reduction by a conventional method is used as a dye, Diax Black BG-FS (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) 15% owf aqueous dispersion, The dye was stained at a ratio of 1:30 and 130 ° C. for 60 minutes, and the final set was performed. The obtained fabric, [η] = 0.63, and a fabric obtained by forming and finally setting a homo-PET single yarn not containing a surface modifier in the same manner as the differential elongation mixed yarn used earlier. The sensory evaluation was simultaneously performed by 10 evaluators, and the evaluator evaluated the excellent feeling of swell, softness, and resilience of the fabric using the differential elongation mixed yarn with respect to the fabric using the homo-PET single yarn. Each person was scored with a maximum of 10 points, and the average score of 10 people was judged according to the following criteria.
◯: 8 points or more (compared to homo-PET yarn, extremely excellent)
○: 5 points or more and less than 8 points (compared to homo-PET yarn, excellent)
×: Less than 5 points (equivalent to homo-PET yarn)
(8) Dyeability The S-twist with a twist coefficient of 2600 was applied to the obtained mixed yarn with different elongation, and a plain weave was woven for warp and weft, and refined at 98 ° C. Thereafter, an intermediate set is performed at 180 ° C., and a fabric subjected to 20% alkali weight reduction by a conventional method is used as a dye, Diax Black BG-FS (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) 15% owf aqueous dispersion, The dye was stained at a ratio of 1:30 and 130 ° C. for 60 minutes, and the final set was performed. The obtained fabric was visually observed with a naked eye under a fluorescent lamp, and 10 evaluators judged whether or not the dyed spots were felt, and the following criteria were used depending on the number of people who felt the dyed spots.
○○: 0 to 1 person ○: 2 to 4 people ×: 5 or more people (9) L value The resulting differential elongation mixed yarn is subjected to S twist with a twist coefficient of 2600, and weaving a plain weave for warp and weft Then, after refining at 98 ° C., intermediate setting at 180 ° C., and a fabric subjected to 20% alkali weight reduction by a conventional method, Diax Black BG-FS (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) 15% Using an owf aqueous dispersion, dyeing was performed at a bath ratio of 1:30 at 130 ° C. for 60 minutes, and finally set, and the L value was measured three times per fabric using a colorimeter (CM-3700D manufactured by Minolta) The average value was calculated and judged according to the following criteria.
○○: L ≦ 14
○: 14 <L ≦ 16
X: 16 <L
Example 1
[Η] = 0.66, in which 4 mol% of IPA showing high shrinkage as the third component is copolymerized in the low elongation yarn A with respect to all glycol components and 0.05 wt% of titanium oxide is contained. Using high-shrinkage polyester yarn, high elongation yarn B, polyester containing 2.5% by weight of colloidal silica fine particles having an average primary particle size of 0.05 μm in the sheath, and a core made by Toyo Styrene Co., Ltd. “Toyostyrene G15L” (MFR = 4.0 g / 10 min) as a core-sheath thread (hereinafter abbreviated as PST / PET composite thread) in a ratio of 10% by weight with respect to the entire core-sheath thread, After winding up the differential elongation mixed yarn POY (intermediate oriented yarn) at a spinning temperature of 295 ° C. and a spinning speed of 3000 m / min as a spun mixed yarn from the same die, the draw ratio using a drawing machine having a pair of hot rollers 1.8 After drawing at a heat setting temperature of 116 ° C., the drawn yarn was wound around a bobbin at a winding speed of 500 m / min to obtain a drawn yarn of 84 dtex-48f. As shown in Table 1, the obtained elongation difference blended yarn has good yarn maneuverability, and the obtained fabric has extremely excellent swell feeling, soft feeling, dyeability, and L value as shown in Table 2. Indicated.

Examples 2 and 3, Comparative Examples 1 and 2
Except for changing the draw ratio as shown in Table 1 and changing the elongation difference {DE (B) -DE (A)} between the low elongation yarn A and the high elongation yarn B, the same as in Example 1. The fabrics obtained by the above method and using the differential elongation mixed yarn were evaluated. Table 2 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling feeling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  Example 2 was slightly inferior to Example 1 in softness and L value, but the yarn-making property and the processing process passability were very good. In Example 3, although the processing process passability and bulging feeling were slightly inferior, the soft feeling was very good.

  On the other hand, Comparative Example 1 had good yarn-making properties and processability, but the difference in length between the low elongation yarn A and the high elongation yarn B was small, so the soft feeling and the rebound feeling were insufficient. The L value exceeded 16 and was inferior in black color development. Further, Comparative Example 2 was excellent in soft feeling because the yarn length difference was large, but it was poor in processing process passability, inferior in texture such as bulging feeling and repulsion feeling, and L value exceeded 16, black coloring property. It became bad.

Examples 4 and 5 and Comparative Examples 3 and 4
The temperature of the second hot roller 4 (hereinafter abbreviated as 2HR) is changed as shown in Table 1, and the difference in boiling water shrinkage between the low elongation yarn A and the high elongation yarn B {BWS (A) -BWS (B )} Was changed in the same manner as in Example 1 except that the fabrics using the differential elongation mixed yarn were evaluated. Table 2 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  Although Example 4 was slightly inferior in processing process passability, swelling feeling, resilience, and dyeability, it was excellent in yarn-making properties. Example 5 was slightly inferior in yarn production, processability, and softness, but was very excellent in swell and rebound.

  On the other hand, in Comparative Example 3, the difference in boiling water shrinkage between the low elongation yarn A and the high elongation yarn B was low, the feeling of swelling and resilience of the fabric after dyeing was insufficient, and the texture was inferior. In Comparative Example 4, the low-elongation A and the high-elongation yarn B had a high boiling water shrinkage ratio and a very good swell feeling, but the yarn-making property and the process processability were extremely poor, and there were many dyeing spots. It was.

Examples 6 and 7, Comparative Examples 5 and 6
The single yarn fineness ratio {D (A) / D (B)} of the low elongation yarn A and the high elongation yarn B was obtained in the same manner as in Example 1 except that it was changed as shown in Table 1. The fabric using the differential elongation mixed yarn was evaluated. Table 2 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  In Example 6, the feeling of swelling and softness were slightly inferior, but the yarn-making property and the processability were very good. Example 7 was slightly inferior in terms of yarn-making property, processing process passability, resilience, and dyeability, but was very excellent in swell and soft feeling.

  On the other hand, although Comparative Example 5 had good resilience, since the single yarn fineness ratio of the low elongation yarn A and the high elongation yarn B was low, the soft feeling was poor and a satisfactory texture could not be obtained. In Comparative Example 6, the fineness ratio between the low elongation yarn A and the high elongation yarn B was high, and the soft feeling was very good, but the process processability was poor, the L value exceeded 16, and the black color developability. It was inferior.

Examples 8 and 9
The difference in elongation difference obtained in the same manner as in Example 1 except that the composite ratio of the polystyrene polymer arranged in the core of the high elongation yarn B to the entire core-sheath composite yarn was changed as shown in Table 3. The fabric using the yarn was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  In Example 8, the feeling of swelling and softness were slightly inferior, but the yarn forming property and the processing process passability were very good. Example 9 was slightly inferior in yarn production and processing process passability, resilience, and dyeability, but was very good in fabric swell and softness.

Example 10
An elongation difference mixed yarn obtained by the same method as in Example 1 except that the type of surface modifier contained in the sheath of the high elongation yarn B is changed to calcium oxide as shown in Table 3. The fabric used was evaluated. As in Example 1, the results are shown in Table 4 for the evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value.

  Example 10 was slightly inferior in yarn-making property and dyeability, but was good in processing process passability.

Examples 11 and 12
The same method as in Example 1 except that the total fineness of the differential elongation mixed yarn composed of the low elongation yarn A and the high elongation yarn B was changed to 33T-16f and 106T-58f, respectively, as shown in Table 3. The fabric using the differential elongation mixed yarn obtained in 1 above was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  Example 11 was slightly inferior in yarn production, processing process passability, swell and rebound, but had a very good soft feeling. In Example 12, although the soft feeling was slightly inferior, the yarn forming property and the swelled feeling were very good.

Examples 13 and 14
Except for changing the average primary particle size of the colloidal silica fine particles contained in the sheath portion of the high elongation yarn B as shown in Table 3, the differential elongation mixed yarn obtained by the same method as in Example 1 was used. The fabric was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  Example 13 was slightly inferior in yarn-making property and dyeability, but was very good in processing process passage. Example 14 was slightly inferior in yarn production and processability, but dyeability, particularly L value was low, and black color development was very good.

Examples 15 and 16
A fabric using an elongation difference mixed yarn obtained by the same method as in Example 1 except that the content of the colloidal silica fine particles contained in the sheath portion of the high elongation yarn B was changed as shown in Table 3. Was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  In Example 15, the softness was good although the yarn-making property, the processing process passability, and the dyeability were slightly inferior. In Example 16, although the yarn-making property and the processing process passability were slightly inferior, the dyeability was very good.

Comparative Example 7
A fabric using a differential elongation mixed yarn obtained in the same manner as in Example 1 except that the polymer of the low elongation yarn A is changed to [η] = 0.63 and homo-PET not containing titanium oxide. Was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  Although the comparative example 7 has good spinning performance, since the low elongation yarn A is not high-shrinkage PET, the boiling water shrinkage rate is greatly reduced, and the difference in boiling water shrinkage rate with the high elongation yarn B is reduced. The textures such as bulge, softness, and rebound were greatly inferior.

Comparative Example 8
Except for changing the core polymer of the high elongation yarn B to [η] = 0.63 and homo-PET containing no titanium oxide, the differential elongation mixed yarn obtained by the same method as in Example 1 is used. The fabric was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  Although the comparative example 8 has good yarn-making property and processing process passability, the core portion of the high elongation yarn B is a homo-PET having a low orientation suppression effect, so that the orientation suppression is insufficient, and the low elongation yarn A As the difference in elongation decreased, the yarn length difference decreased, and the texture such as swell and softness was greatly inferior.

Comparative Example 9
Extensive difference blended yarn obtained by the same method as in Example 1 except that the sheath polymer of the high elongation yarn B was changed to [η] = 0.63 and homo-PET containing no surface modifier. Evaluation of the fabric using was performed. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  In Comparative Example 9, the yarn-making property and the processing process passability were good, but the high elongation yarn B does not contain a surface modifier, so the L value after black dyeing significantly exceeds 16 and black color development. The property was remarkably bad.

Comparative Example 10
The sheath polymer of the high elongation yarn B is changed to [η] = 0.63, homo-PET containing no surface modifier, and the composite ratio of the core polystyrene polymer is 5% by weight with respect to the entire core-sheath yarn. The elongation difference mixing obtained in the same manner as in Example 1 except that the low elongation yarn A was changed to 48T-24f, the high elongation yarn B was changed to 48T-24f, and the total fineness was changed to 96T-48f. The fabric using the yarn was evaluated. Table 4 shows the results of evaluation of the yarn forming property, the processing process passability, the swelling, the soft feeling, the dyeability and the L value in the same manner as in Example 1.

  In Comparative Example 10, since the single yarn fineness of the low elongation yarn A and the high elongation yarn B is exactly the same, the feeling of swelling and softness when used as a fabric was inferior. Further, since the high elongation yarn B does not contain a surface modifier, the dyeability is also greatly inferior.

It is a figure showing a mixed fiber spinning and winding-up apparatus. It is a figure showing an extending | stretching apparatus.

Explanation of symbols

1: Spin block 2: Non-woven fabric filter 3: Base 4: Chimney 5a: Low elongation yarn side yarn 5b: High elongation yarn side yarn 6: Refueling guide 7: First roller 8: Second roller 9: Winding Yarn 10: Supply yarn 11: Feed roller 12: First hot roller 13: Second hot roller 14: Cold roller 15: Stretched yarn

Claims (5)

An elongation difference mixed yarn composed of a low elongation yarn A and a high elongation yarn B, which satisfies the following (1) to (5):
(1) The low elongation yarn A is made of a copolyester exhibiting high shrinkage.
(2) The high elongation yarn B is a core-sheath yarn that exhibits low shrinkage, and is a core-sheath yarn in which a polyester containing a surface modifier is disposed in the sheath and a polystyrene polymer is disposed in the core. thing.
(3) 20% ≦ DE (B) −DE (A) ≦ 70%
(4) 7% ≦ BWS (A) −BWS (B) ≦ 13%
(5) 2.0 ≦ D (A) / D (B) ≦ 5.0
DE (A): Breaking elongation of low elongation yarn A DE (B): Breaking elongation BWS of high elongation yarn B (A): Boiling water shrinkage BWS (B) of low elongation yarn A: High elongation Boiling water shrinkage ratio D (A) of single yarn B: Single yarn fineness of low elongation yarn A D (B): Single yarn fineness of high elongation yarn B   2. The differential elongation mixed yarn according to claim 1, wherein the surface modifier contained in the high elongation yarn B is inorganic fine particles having an average primary particle size of 0.02 to 0.1 [mu] m.   3. The differential elongation mixed yarn according to claim 1 or 2, wherein the surface modifier contained in the high elongation yarn B is colloidal silica.   The elongation according to any one of claims 1 to 3, wherein the content of the surface modifier contained in the high elongation yarn B is 0.4 to 5 wt% with respect to the sheath polymer. Degree blended yarn.   The elongation difference mixed fiber according to any one of claims 1 to 4, wherein the content of polystyrene polymer in the high elongation yarn B is 7 to 20% by weight.

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