JP5116995B2 - Long / short composite spun yarn and fabric comprising the same - Google Patents

Description

  The present invention relates to a long / short composite spun yarn having a peach skin touch-like surface feeling and having excellent swell feeling, high soft stretch properties and recoverability, and relates to a fabric such as a woven or knitted fabric using the long / short composite spun yarn.

  Conventionally, various yarns have been proposed as composite spun yarn aiming at obtaining a peach skin touch-like surface feeling.

  For example, as a composite spun yarn having a light weight, high bulkiness, excellent heat retention, and less likely to cause whitening even against friction such as flat surfaces and bending, a hollow rate of 10 to 40% and boiling water shrinkage rate of 8% or more A composite spun yarn having a core-sheath structure in which a hollow filament yarn and a short fiber bundle are superposed and twisted, and the mixed weight ratio of the hollow filament yarn in the core portion and the short fiber bundle in the sheath portion is a core / sheath A composite spun yarn obtained by boiling water treatment after yarn formation is proposed (Patent Document 1).

  However, in the proposal described in Patent Document 1, since it is twisted, boiling water treatment is always necessary to regulate the boiling water shrinkage rate of the filament and to further suppress the occurrence of nude yarn. Production management was difficult.

  In addition, it has a peach skin-like surface appearance, excellent anti-molding properties, little washing shrinkage, soft knitted fabric and knitted fabric with a soft feel and a good feel, with a single fiber denier of 3d or less and an average fiber length of 64mm or less. The solvent-spun cellulose short fiber (a) and the polyester short fiber (b) constitute the sheath and core of the core-sheath composite spun yarn, respectively, and the mixed weight ratio is 0.7 ≦ (a) / (b ) A woven or knitted fabric made of a core / sheath composite spun yarn satisfying ≦ 3.0, and a core / sheath composite spun yarn / knitted fabric having fibrils on the surface thereof has been proposed (Patent Document 2).

However, this was inferior in elasticity, stiffness and pilling.
In addition, as a composite spun yarn for clothing that has a unique peach skin-like surface appearance that applies the properties of fibrillation, has excellent dimensional stability after washing, is soft and soft to the touch, Solvent-spun cellulose in which a spun yarn of solvent-spun cellulose fiber is used as a core yarn, one or more filament yarns are used as sheath yarns, and at least one of the filament yarns is arranged in a direction opposite to the spinning twist direction A composite spun yarn using fibers has been proposed (Patent Document 3).

  However, it was judged that there was still room for improvement in terms of elasticity, stiffness and texture.

  On the other hand, many researches and developments have been conducted on long and short composite spun yarns composed of filaments and short fibers. For example, polyurethane-based elastic yarns that have been provided with stretch properties using stretchable filaments. And composite yarns (CSY) with short fibers using cores, and core yarns that converge stretchable filaments and place them at the core of the short fiber bundle. However, when using elastic fibers such as polyurethane, which utilizes the stretchability of the fiber itself, high stretchability and resilience can be obtained, but the texture, drapeability, and dyeability are poor. There is. In addition, when a filament having a relatively large crimp such as false twisted yarn is used, a certain degree of stretchability is obtained, but the feeling of fluffiness becomes too strong, which is not preferable.

  Therefore, it is conceivable to use a side-by-side type composite fiber having a three-dimensional coil generated by a difference in contraction rate between composite polymers as the stretchable filament.

  However, when the conventional side-by-side type composite fiber is subjected to heat treatment in a fabric restraint, the shrinkage of the polymer is fixed as it is, and the ability to recover crimp is reduced, so that sufficient stretchability cannot be obtained. It was. In addition, long and short composite spun yarns of filaments and short fibers lack in entanglement and restraint between the core component and the sheath component, so-called nude yarn is generated in which the sheath component and the core component are separated, and pass through the subsequent knitting and knitting process. There were problems such as the generation of neps due to friction at times.

  Therefore, in order to prevent the above-described problems, the conventional long and short composite spun yarn strongly constrains the core component filament and the sheath component short fiber by setting the twist of the spun yarn to be higher than usual. However, according to such a method, the short fiber component is strongly converged, so that not only a soft texture and a feeling of swelling are obtained, but also when a side-by-side type composite fiber filament is used as the core component, crimping is performed. There is a problem in that the expression of is suppressed, and as a result, the stretchability is also impaired.

Thus, a long / short composite spun yarn using a side-by-side type composite fiber filament using polyester mainly composed of polymethylene terephthalate has been proposed (Patent Document 4). Although good stretchability can be obtained by using this side-by-side type composite fiber, further improvements have been demanded in terms of elasticity, firmness and texture.
JP-A-7-278982 Japanese Patent Laid-Open No. 9-143836 JP 11-172544 A JP 2003-20533 A

  The present invention provides a novel long / short composite spun yarn that has a good peach skin touch-like surface feel, and that can provide a fabric that is excellent in elasticity, touch and touch, and the long / short composite spun yarn. An object of the present invention is to provide a woven / knitted fabric / fabric having a good peach skin touch-like surface feeling obtained by use, and a good firmness, firmness and feel.

In order to solve the above-described problem, the present invention has the following configuration (1).
(1) The core portion has a composite fiber filament in which two types of polyester polymers, one of which is polyester mainly composed of polytrimethylene terephthalate, are bonded side-by-side along the fiber length direction. A long and short composite spun yarn having solvent-spun cellulose-based short fibers having fibrils separated and separated at a fiber diameter of 1 to 10 μm along the fiber axis direction, and substantially non-twisted, A long / short composite spun yarn , wherein the side-by-side type composite fiber filament occupies 15 to 60% by weight of the entire spun yarn, and the solvent-spun cellulose fiber in the sheath portion occupies 40 to 85% by weight of the spun yarn.

In addition, the long and short composite spun yarn of the present invention preferably has a specific configuration described in any of the following (2) to (3) .

(2) The long / short composite spun yarn according to (1), wherein an elongation recovery rate at 20% elongation of the side-by-side type composite fiber filament is 80% or more.

(3) A fabric having a peach skin touch tone, comprising the long and short composite spun yarn according to any one of the above (1) to (2) having fibrils on the surface.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the fabric excellent in the texture which has the surface feeling of a favorable peach skin touch tone, and has an unprecedented firmness and a touch feeling.

The long and short composite spun yarn of the present invention has a composite fiber filament in which two types of polyester polymers, one of which is polyester mainly composed of polytrimethylene terephthalate, bonded side by side along the fiber length direction. It has a solvent-spun cellulose-based short fiber having fibrils separated and separated at a fiber diameter of 1 to 10 μm along the fiber axis direction in the sheath portion, and is a substantially untwisted long / short composite spun yarn.

  First, the multifilament of the side-by-side type composite fiber used for the long and short composite spun yarn of the present invention will be described.

  The side-by-side type composite fiber used in the present invention is one in which polymers having different intrinsic viscosities, copolymerization components, copolymerization rates, and the like are bonded together, and crimps are developed due to differences in their elastic recovery characteristics and shrinkage characteristics. . In the case of a side-by-side type composite having an intrinsic viscosity difference, stress concentrates on the high intrinsic viscosity side during spinning and drawing, so that the internal strain differs between the two components. Therefore, the high-viscosity side contracts greatly due to the difference in elastic recovery rate after stretching, and distortion occurs in the single fiber, resulting in a three-dimensional coil crimp. It can be said that the diameter of this three-dimensional coil and the number of coils per unit fiber length are determined by the shrinkage difference (including the elastic recovery rate difference) between the high shrinkage component and the low shrinkage component. And the number of coils per unit fiber length increases.

  The coil crimp required as a stretch material has a small coil diameter, a large number of coils per unit fiber length (excellent stretch characteristics and good appearance), and good coil sag resistance (depending on the number of stretches) The amount of sag of the coil is small and the stretch retention is excellent), and the hysteresis loss at the time of recovery of extension of the coil is small (excellent elasticity and good fit). While satisfying all these requirements, it has a characteristic as polyester, for example, moderate tension, drape, and high dyeing fastness, so that it can be made into a stretch material excellent in total balance.

  Here, in order to satisfy the coil characteristics described above, the characteristics of the high shrinkage component (high viscosity component) are important. Since the expansion / contraction characteristics of the coil are dominated by the expansion / contraction characteristics of the high contraction component with the low contraction component as a fulcrum, the polymer used for the high contraction component is required to have high extensibility and recoverability.

  Accordingly, as a result of intensive studies to satisfy the above-mentioned properties without impairing the properties of the polyester, the present inventors have used a polyester mainly composed of polytrimethylene terephthalate (hereinafter abbreviated as PTT) as a high shrinkage component. I found. PTT fibers have the same mechanical and chemical characteristics as polyethylene terephthalate (hereinafter abbreviated as PET) and polybutylene terephthalate (hereinafter abbreviated as PBT) fibers, which are typical polyester fibers, and are elastic. Excellent recovery and elongation recovery.

  This is because the methylene chain of the alkylene glycol part in the crystal structure of PTT is a Gauche-Gauche structure (the molecular chain is bent at 90 degrees), and further, the density of restraint points due to the interaction between benzene rings (stacking, parallel) This is probably because the molecular chain easily stretches and recovers due to the rotation of the methylene group.

  Here, PTT in the present invention is a polyester obtained using terephthalic acid as the main acid component and 1,3-propanediol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol%, more preferably 10 mol% or less. Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, Although diols, such as cyclohexane dimethanol, polyethylene glycol, polypropylene glycol, can be mentioned, it is not limited to these. If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments as an antioxidant may be added.

  In addition, the low shrinkage component (low viscosity component) is not particularly limited as long as it is a fiber-forming polyester that has good interfacial adhesion with PTT, which is a high shrinkage component, and has stable yarn-making properties. Considering mechanical properties, chemical properties, and raw material prices, PET capable of forming fibers is preferable.

  Moreover, the composite ratio of both components is preferably in the range of high shrinkage component: low shrinkage component = 75: 25 to 35:65 (% by weight) in terms of yarn production and dimensional homogeneity of the coil in the fiber length direction. : The range of 35-45: 55 is more preferable.

  The cross-sectional shape of the side-by-side type composite fiber used in the long and short composite spun yarn of the present invention may be a round cross section, a flat cross section, a triangular cross section, a multi-loval cross section, an X-shaped cross section, or other irregular cross sections, but in particular, a dharma type cross section. It is more preferable that

  The dharma-shaped cross section referred to here is, for example, bonded in the direction in which the interface between the PTT component A and the PET component B intersects with the longitudinal direction of the cross section, as shown in FIG.

  The side-by-side type composite fiber is easy to express crimps having torque in the S and Z directions alternately in the form of multifilament phases being aligned, and as a result, the entire multifilament is twisted at the transition of the S and Z torques. If this is done, wrinkles are likely to occur.

  Therefore, it is preferable that the side-by-side type composite fiber used for the long and short composite spun yarn of the present invention does not have a crimped phase that is uniform between the single yarns constituting the multifilament.

  Here, the phase of crimp refers to a pattern in which the crimp of torque in the S direction and the crimp of torque in the Z direction are alternately expressed in a single yarn. For example, by arranging the crimp of the Z torque of another single yarn at a place where one single yarn exhibits S torque crimp, the mutual torque is erased without losing the stretch property, and the generation of wrinkles Can be suppressed. In order to prevent the crimping phases from being aligned between the single yarns constituting the multifilament, it is necessary to disperse the crimping force. As a means for this, the cross-section of the side-by-side type composite fiber is particularly shown in FIG. With the Dalma type cross section as shown, the occurrence of wrinkles can be prevented satisfactorily and a higher quality fabric can be obtained.

  Further, the single yarn fineness of the side-by-side type composite fiber filament is preferably 1.1 to 10 dtex, and more preferably 1.1 to 6 dtex. By setting it to 1.1 decitex or more, the effect of stretchability by crimping can be obtained.

  The side-by-side type composite fiber used for the long and short composite spun yarn of the present invention preferably has an elongation recovery rate of 80% or more when stretched by 20%. If this stretch recovery rate is 80% or more, the stretch-back property and the crimp development property, which are excellent when making a long and short composite spun yarn, are strongly entangled with the short fiber component and excellent in the shape stability of the core-sheath structure. A long and short composite spun yarn having a feeling of swelling and high stretch can be obtained, and good stretchability can be obtained when it is made into a woven fabric.

  Next, solvent-spun cellulose-based short fibers used for the long and short composite spun yarns of the present invention will be described. In the present invention, the short fibers are those constituting the sheath of long / short composite spun yarns and made of solvent-spun cellulose short fibers. The reason for using solvent-spun cellulose-based short fibers is that they are easily fibrillated and a good peach skin touch tone is easily achieved in the fabric.

  The cross-sectional shape of the solvent-spun cellulose-based short fiber is not particularly limited, and may be round or irregularly shaped such as polygonal, H-shaped or hollow. Further, the fineness of the solvent-spun cellulose short fiber is not particularly limited, but is preferably in the range of 0.6 to 5 dtex in view of spinnability. The fiber length is preferably a fiber length corresponding to various spinning methods. However, when air spinning is used, about 25 mm to 51 mm can be preferably used in consideration of the spinning principle, and further, the range is 30 mm to 44 mm. Most preferably, it is within. Further, the fineness of the short fibers is not particularly limited, but 0.6 to 5 dtex is preferable in consideration of spinnability.

  Hereinafter, the long / short composite spun yarn of the present invention and the woven / knitted fabric obtained by using the long / short composite spun yarn of the present invention will be described in more detail.

  The long and short composite spun yarn of the present invention has the above-mentioned side-by-side type composite fiber filament in the core portion and the solvent-spun cellulose-based short fiber in the sheath portion, and further provides excellent covering properties, light weight, and a feeling of swelling. Therefore, it is important that the spun yarn itself is substantially untwisted.

  That is, if the yarn is a substantially untwisted structure yarn, the above-mentioned side-by-side type is achieved by the strong binding force to the filament component of the core portion by the short fiber component such as the actual twist yarn or the actual twist imparted to the filament of the core portion. The excellent stretch back property and crimp development property of the composite fiber filament are not suppressed, and excellent soft stretch properties, recoverability, and a feeling of swelling can be sufficiently exhibited. Further, since the three-dimensional coil crimp of the side-by-side type composite fiber filament is sufficiently expressed even inside the spun yarn, the entanglement with the short fiber component can be sufficiently obtained although it is a non-twisted structure, and the sheath due to ironing etc. A good long and short composite spun yarn with little peeling of the part can be obtained.

  Here, the substantially untwisted structure yarn in the present invention means that there is no occurrence of untwisting due to the action of twisting torque, or a very small state, and the solvent-spun cellulose-based short fiber component When the average fiber length is Ls, it means that a real twist of 4.0 T / Ls or less is applied or a non-twisted one. When the number of twists is 4.0 T / Ls or less, there is no occurrence of untwisting due to the action of twisting torque, so that it can be said to be a substantially untwisted structure yarn.

  Furthermore, in the case of a real twist structure yarn, the number of twists is set to be higher than usual in order to sufficiently cover the filament in the core with the short fibers in the sheath and prevent the short fiber components from falling off due to ironing or the like. There is a need. However, in this case, the force that restrains the filament in the core due to the short fiber component becomes too high, and the excellent stretch-back property of the above-mentioned side-by-side type composite fiber is lost. Since the real twist is imparted, the expression of crimps is lowered, and a sufficient feeling of swelling cannot be obtained. Therefore, it is not suitable as a means for obtaining the excellent texture intended by the present invention.

In the long / short composite spun yarn of the present invention, it is important that the solvent-spun cellulose-based short fiber component in the sheath is in the range of 40 to 85% by weight in the entire long / short composite spun yarn. More preferably, it is in the range of -70% by weight. When the mixing ratio of the solvent-spun cellulose-based short fiber component is less than 40% by weight, the number of solvent-spun cellulose-based short fibers decreases, so that sufficient coverage cannot be obtained, and conversely, it is larger than 85% by weight. In this case, the influence of the physical properties of the solvent-spun cellulose-based short fiber component becomes dominant, and a significant difference from the normal fiber is reduced. Therefore, the coverage by the solvent-spun cellulose-based short fiber and the excellent performance as described above are achieved. In order to obtain the combined short and long composite spun yarn, it is more preferable that the mixing ratio of the solvent-spun cellulose short fiber component is in the range of 50 to 70% by weight.

In the long and short composite spun yarn of the present invention, it is important that the solvent-spun cellulose short fibers located in the sheath have fibrils separated and separated at a fiber diameter of 1 to 10 μm along the fiber axis direction. Here, the fiber diameter of the separated fibrils refers to the width of the split-like crystal fiber in the fiber axis in the dry state, and the peeled fiber is mainly the width of the fiber axis in units of μm. It means that it is in a state of being divided along the line. More preferably, the fiber diameter of the fibrils subjected to the above-described separation and splitting is 2 to 5 μm.

  In order to make a fabric using the long and short composite spun yarn of the present invention, it can be carried out by weaving, knitting or the like by a method conventionally known as a method for forming a fabric, and nothing special is required. It should be noted that a twisting action and a squeezing physical action that cause the effect of untwisting to be lost should not be given in the spinning process or the cloth making process.

  With the long and short composite spun yarns of the present invention, it is possible to obtain a fabric having excellent water absorption and anti-pill properties, excellent lightness, and an unprecedented sharpness.

  The fabric such as woven fabric and knitted fabric obtained by the present invention has a peach skin touch tone by having fibrils on the surface of the woven fabric, knitted fabric or fabric.

  Of course, other yarns can be woven or knitted as long as the effects of the present invention are not impaired.

  Next, an example of a method for producing the long and short composite spun yarn of the present invention will be specifically described.

  First, the aforementioned side-by-side type composite fiber filament fiber and solvent-spun cellulose-based short fiber are prepared. Each fiber may be produced by a known method. Next, these fibers are spun into a spun yarn.

  The spinning method is not particularly limited as long as the resulting long and short composite spun yarn is substantially non-twisted, but the spun yarn is formed by binding solvent-spun cellulose short fiber components by the action of airflow. In a general-purpose air spinning machine, a method obtained by supplying filaments to the center of a solvent-spun cellulose-based short fiber bundle in front of the yarn forming unit via an appropriate feed roller and a long fiber facility such as a yarn path guide Can be preferably used.

  Particularly preferred is a method using “Murata Vortex Spinner” (Murata Machine Co., Ltd .: hereinafter referred to as MVS). Various spinning methods utilizing the action of airflow have been proposed, developed and used. However, in order to obtain the long and short composite spun yarn of the present invention, it is important that the coverage is good, and MVS is used. The spinning method used is one of the spinning methods that can achieve this most.

  Other methods include the following methods. First, the solvent-spun cellulose-based short fiber component is mixed with a low melting point fiber having a low melting point of preferably 120 ° C. or less at a certain ratio, and is actually twisted by a general production method of long and short composite spun yarn using a ring spinning machine. A long and short composite spun yarn with a structure is obtained. Next, this long and short composite spun yarn is placed on a hot-roller or a ring twisting machine with a non-contact type hot plate, giving the same number of twists in the reverse twisting direction as the spinning machine, and the twisting is completed. While returning, the low-melting fiber mentioned above can be fused to the surrounding short fibers and filaments by a hot roller or a hot plate to obtain an untwisted long / short composite spun yarn. In the case of this method, it is important to set appropriately so as not to impair the texture of the long and short composite spun yarn that can obtain the mixing ratio of the low melting point fiber to be mixed, the number of twists to be given, the temperature setting value of the hot roller, or the hot platen. .

Hereinafter, the present invention will be described in detail with reference to examples.
[Evaluation measurement method]
(1) Elongation recovery rate Using a constant speed extension type tensile tester with a self-recording device, with an initial load of 0.0826 cN per decitex, attached to a 20 cm grip interval, with a tensile speed of 20 cm / min. It was stretched to 20% elongation and immediately deweighted at the same rate. Immediately after complete dewetting, the film was stretched to the initial load, and the recovery elongation at this time was defined as the elongation recovery rate.

(2) Coverability evaluation Evaluation was made by observing the side face of the obtained long / short composite spun yarn with a 25 × microscope, and judging from the number of places where the filament of the core portion could be confirmed from the surface layer per 1 m of yarn length.
Judgment criteria were four-step evaluation: x: 10 or more places or occurrence of nude yarn, Δ: 5-9 places, ◯: 1-5 places, ◎: 0 places.

(3) Pilling property Weaving a plain weave fabric using both long and short composite spun yarns for both warp and weft, using the ICI method of JIS L-1076 (1992), processing time is 10 hours, and class discrimination did.

(4) Sensory evaluation Weaving a plain weave fabric using both long and short composite spun yarns for both warp and weft. The resulting machine is relaxed and heat treated at 95 ° C with an open soaper, dried and dried at 180 ° C. Intermediate setting was performed, dyeing was performed at 120 ° C., and then finishing setting was performed by a pin tenter method with a dry heat of 160 ° C.

  The obtained fabric was subjected to a sensory test with 10 monitors for a sense of firmness, lightness, touch, and surface (particularly peach skin touch), and the average of the determination results was taken as the evaluation result.

  The evaluation criteria are as follows: x: not felt at all, Δ: hardly felt, ◯: felt, ◎: felt strongly, x = 0 point, Δ = 1 point, ○ = 2 point, ◎ = Replaced with 3 points and averaged points, 0.0 to 0.9 points x, 1.0 to 1.5 points Δ, 1.6 to 2.5 points ○, 6 points or more were evaluated as ◎.

Example 1
Homo-PTT (polytrimethylene terephthalate) with an intrinsic viscosity (IV) of 1.40 and homo-PET with an intrinsic viscosity (IV) of 0.60 were melted separately from a 24-hole composite spinneret at a spinning temperature of 275 ° C. It is discharged at a composite ratio (% by weight) of 50:50, and is taken up at a spinning speed of 1400 m / min. It was. Further, using a hot roll-hot plate drawing machine (filing length: 20 cm, surface roughness: 3 s), the hot roll temperature is 75 ° C., the hot plate temperature is 170 ° C., and the draw ratio is 3.3 times, and then drawn once. Then, it was continuously wound relaxed at 0.9 times to obtain a drawn yarn of 55 dtex and 24 filaments. Both the spinning and the drawing had good yarn-making properties, and no yarn breakage occurred.

  The obtained side-by-side type composite fibers had excellent elongation recovery with an elongation recovery rate of 85.5%.

  Using a modified cellulose short fiber (“Lyocell”, 1.3 dtex × 40 mm: manufactured by LENZING) as a short fiber for long and short composite spun yarn, a sliver with a thickness of 1.0 g / m is passed through a normal spinning method. Created.

  The obtained sliver is mounted on the MVS spinning machine, and the hollow filament is supplied from the front top roller to the second top roller to the center position in the width direction of the short fiber bundle through the filament feed roller device and the yarn path guide. Thus, a 30 'long and short composite spun yarn was obtained with a cotton count. The coating property was excellent, the occurrence of yarn breakage was small, and the spinnability was good.

The obtained long and short composite spun yarn was used as a weft yarn, the warp yarn was used as a polyethylene terephthalate filament yarn, and the woven structure was set to 3/1 twill using a normal loom to obtain a woven fabric having a texture of 283 g / m ² . As a result of each evaluation of the obtained fabric, as shown in Table 1, the covering property was good, and the swelling feeling, soft stretchability, recoverability and surface feeling were excellent.

Example 2
A cotton swatch was prepared in the same manner as in Example 1 except that a sliver with a thickness of 0.8 g / m was prepared so as to have the mixing ratio shown in Table 1, and the draft rate of the air spinning machine was set to 180 times. A 60's long / short composite spun yarn was obtained.

  Further, a woven fabric was obtained in the same manner as in Example 1. As a result of performing each evaluation on the obtained fabric, the covering property was good, and the swelled feeling, the soft stretch property, the recoverability and the surface feeling were excellent.

Example 3
A sliver with a thickness of 2.0 g / m was prepared so as to have the mixing ratio shown in Table 1, and the cotton method was performed in the same manner as in Example 1 except that the draft rate of the air spinning machine was set to 90 times. A 20's long and short composite spun yarn was obtained with a count.

  Further, a woven fabric was obtained in the same manner as in Example 1. As a result of performing each evaluation on the obtained fabric, the covering property was good, and the swelled feeling, the soft stretch property, the recoverability and the surface feeling were excellent.

Example 4
A sliver having a thickness of 2.5 g / m was prepared so as to have the mixing ratio shown in Table 1, and the cotton method was performed in the same manner as in Example 1 except that the draft rate of the air spinning machine was set to 50 times. 11's long and short composite spun yarn was obtained with a count.

  The obtained long and short composite yarns were excellent in coverage. Since the mixing ratio of the side-by-side type composite fiber filament was low, the feeling of swelling, soft stretchability, and recoverability were inferior to those of Examples 1 to 3 in sensory evaluation, but the surface feeling was excellent.

Example 5
A sliver having a thickness of 0.6 g / m was prepared so as to have the mixing ratio shown in Table 1, and the cotton method was performed in the same manner as in Example 1 except that the draft rate of the air spinning machine was set to 200 times. A 70's long and short composite spun yarn was obtained with a count.

  An excellent sensory evaluation was obtained, but the coverage was slightly low due to the small number of short fibers, and the generation of nude yarn was somewhat high.

Comparative Example 1
Using the same short fiber as in Example 1, a roving yarn having a thickness of 0.35 g / m was prepared through a normal spinning method and mounted on a ring spinning machine. On the other hand, the same side-by-side type composite fiber as that used in Example 1 is supplied from between the front top roller to the second top roller to the center position of the short fiber bundle through a feed roller device for filament and a yarn path guide, The draft rate of the spinning machine was set to 40 times and the number of twists was set to 27.8 T / 2.54 cm, and a 30's long / short composite spun yarn was obtained with a cotton count.

The obtained long and short composite spun yarn was excellent in spinnability, but its coverage was inferior to that of Example 1. Because the binding force to the side-by-side type composite fiber by real twist is strong, weaving yielded a woven fabric with a texture of 296 g / m ² , but was inferior in pilling and soft stretch properties, and good in other sensory evaluations The result could not be obtained.

Comparative Example 2
The same sliver as that used in Example 1 was used, and a 30 s spun yarn was obtained using an MVS spinning machine without supplying filaments. As in Example 1, a woven fabric with a texture of 287 g / m ² was obtained and each evaluation was performed. However, since no side-by-side type composite fiber was used at the center, swelling feeling, soft stretchability, and sufficient recovery were achieved. There was no soft stretch.

Comparative Example 3
A 30's long / short composite spun yarn is obtained with a cotton count as in Example 1, except that viscose rayon short fiber (1.7 dtex × 38 mm) is used as the short fiber of the long / short composite spun yarn. It was. The obtained long and short composite spun yarns were excellent in covering properties, produced few yarn breaks, and had good spinning properties without breakage of the hollow portions after processing.

A woven fabric having a texture of 290 g / m ² was obtained from the obtained long and short composite spun yarn in the same manner as in Example 1. As a result of performing each evaluation on the obtained fabric, it was excellent in feeling of swelling, soft stretchability, and recoverability, but because of using viscose rayon short fiber, peach skin touch A tonal surface was not obtained.

FIG. 1 is a schematic cross-sectional model diagram showing an example of a cross-sectional shape of a side-by-side type composite fiber used in the present invention.

Explanation of symbols

B: Polytrimethylene terephthalate B: Polyethylene terephthalate

Claims (3)

The core has a composite fiber filament in which two polyester polymers, one of which is polyester mainly composed of polytrimethylene terephthalate, are bonded side-by-side along the fiber length direction. A solvent-spun cellulosic short fiber having fibrils separated and separated with a fiber diameter of 1 to 10 μm along the direction, and a substantially short untwisted long / short composite spun yarn having a side-by-side type composite of the core part A long / short composite spun yarn , wherein fiber filaments occupy 15 to 60% by weight of the whole spun yarn, and solvent-spun cellulose fibers in the sheath part occupy 40 to 85% by weight of the whole spun yarn. The long / short composite spun yarn according to claim 1, wherein the side-by-side type composite fiber filament has an elongation recovery rate of 80% or more at 20% elongation. A fabric having a peach skin touch tone using the long and short composite spun yarn according to any one of claims 1 and 2 having a fibril on a surface thereof.

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