JP2007327147A - Long and short conjugate spun yarn and cloth by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long and short conjugate spun yarn optimizing a light weighted feeling, touch feeling, water absorptivity, etc., that are characteristics of a product using rayon, and also excellent in bulky feeling, high stretching property and recovering property, and also to provide a cloth obtained by using the same yarn. <P>SOLUTION: This long and short conjugate fiber spun yarn obtained by pasting 2 kinds of polyester-based polymers one of which consists mainly of a polytrimethylene terephthalate, as a side by side in fiber length direction in its core part, and having a modified cellulose-based short fiber or a high wet modulus rayon short fiber in its sheath part is provided by substantially having no twist. The cloth formed by using the same yarn is also provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a long / short composite spun yarn and a fabric using the same.

  Conventionally, as a property of improved fiber characteristics of viscose rayon (eg, solvent-spun cellulose fiber “Lyocell”, polynosic, cupra, etc.), fibrillation may occur by applying dry and wet friction. For this reason, the spun yarns and fiber products using them have the disadvantages that fibrils are present on the product surface and in the products, and that fibrillation proceeds. Therefore, in order to solve this drawback, it is necessary to perform resin processing for preventing fibrillation, oxygen reduction processing, and the like.

  However, in the case of these treatments and processing, it is difficult to obtain a superior texture and lightness, and it is required to realize a spun yarn that can be practically manufactured up to the conventional dyeing process. It had been. In particular, it has the best lightness, texture, water absorption, etc., which are the characteristics of products using rayon as described above, and has excellent properties such as wrinkle resistance, elasticity, stiffness, and resilience. There has been a demand for realization of spun yarn capable of realizing a product having the same.

  A composite spun yarn having a core-sheath structure in which a hollow filament yarn having a hollow rate of 10 to 40% and a boiling water shrinkage rate of 8% or more and a short fiber bundle are overlapped and twisted as a composite spun yarn that meets such a demand. A composite spun yarn is proposed in which the mixing weight ratio of the hollow filament yarn in the core portion and the short fiber bundle in the sheath portion is core / sheath ≦ 1.5, and the yarn is subjected to boiling water treatment after forming the yarn. (Patent Document 1).

  However, the composite spun yarn proposed in Patent Document 1 has the best lightness, texture, water absorption, etc., which are the characteristics of the product using the rayon targeted by the present invention, and It did not reach the level of excellent crease resistance, elasticity, stiffness, and resilience.

  On the other hand, many researches and developments have been made on long and short composite yarns of filaments and short fibers. For example, polyurethane-based elastic yarns are used as stretched filaments. For example, a composite yarn (CSY) with the short fiber, a core yarn that converges a stretchable filament and positions it at the core of the short fiber bundle, and the like.

  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 yarns of filaments and short fibers lack the entanglement property and restraint property of 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 when passing through the subsequent knitting and knitting process There was a problem such as generation of neps due to friction.

  Therefore, in the conventional long / short composite yarn, in order to prevent the above problems, the twist of the spun yarn is usually set higher than that of the core component, and the filaments of the core component and the short fibers of the sheath component are strongly restrained.

  However, according to such a method, since the convergence of the short fiber component becomes strong, not only a soft texture and a feeling of swelling cannot be obtained, but also when a side-by-side type composite fiber filament is used as the core component, There was a problem that the expression of shrinkage was suppressed, and as a result, stretchability was also impaired.

  Therefore, a long / short composite yarn using a side-by-side type composite fiber filament using polyester mainly composed of polytrimethylene terephthalate has been proposed (Patent Document 2).

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 JP 2003-20533 A

  In view of the above points, the object of the present invention is to improve the lightness, texture, water absorption, etc., which are the characteristics of a product using rayon, and to prevent wrinkles, elasticity, stiffness, An object of the present invention is to provide a long / short composite spun yarn and a fabric using the long / short composite spun yarn that make it possible to obtain a fabric excellent in resilience and the like.

The long and short composite spun yarn of the present invention that achieves the above-mentioned object has the following configuration (1).
(1) A composite fiber filament fiber in which two polyester polymers, one of which is polyester mainly composed of polytrimethylene terephthalate, are bonded to the side-by-side type along the fiber length direction, and the sheath is modified. A long / short composite spun yarn comprising cellulose short fibers or high-wet modulus rayon short fibers and being substantially untwisted.

  More specifically, the long and short composite spun yarn of the present invention is preferably composed of any one of the following (2) to (5).

(2) The composite fiber filament fiber bonded to the side-by-side type of the core occupies 15 to 60% by weight of the entire spun yarn, and the modified cellulose short fiber or high wet modulus rayon short fiber of the sheath portion is the total spun yarn. The long and short composite spun yarn according to the above (1) 1, characterized by occupying 40 to 85% by weight.

(3) The above characterized in that the strength of the modified cellulose short fiber or high wet modulus rayon in the sheath part is 3.0 cN / dtex or more in dry strength and the strength after 5% alkali treatment is 1 cN / dtex or more ( The long and short composite spun yarn according to 1) or (2).

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

(5) A fabric comprising the long and short composite spun yarn according to any one of (1) to (4) above.

  According to the present invention, the lightness, texture, water absorption, etc., which are the characteristics of a product using rayon, are optimized, and the texture, texture, and touch are unprecedented and excellent in texture. It is possible to provide a long / short composite spun yarn and a fabric using the long / short composite spun yarn that make it possible to provide a long fabric.

  The long and short composite spun yarn of the present invention is a composite fiber filament fiber 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. The sheath has modified cellulose-based short fibers or high-wet modulus rayon short fibers, and is substantially non-twisted.

  That is, in the long and short composite spun yarn of the present invention, the composite fiber filament fiber bonded to the side-by-side type is used as the core, and the long and short composite spun yarn including the modified cellulose short fiber or the high wet modulus rayon short fiber is used as the sheath. Furthermore, in order to obtain excellent covering properties, light weight, and a feeling of swelling, it is important that the spun yarn itself is substantially untwisted.

  That is, if it is a substantially untwisted structure yarn, a strong binding force to the filament component of the core by the modified cellulose short fiber component or the high wet modulus rayon short fiber component such as a real twist yarn, or the filament of the core Due to the actual twist imparted to the fiber, the hollow shape of the hollow fiber filament is not destroyed, and excellent texture such as excellent lightness, water absorption, and swell can be exhibited.

  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 modified cellulose short fiber component or When the average fiber length of the high-wet modulus rayon short fiber component 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.

  By the way, in the case of a real twist structure yarn, the core filament is sufficiently covered with the modified cellulose short fiber component or the high-wet modulus rayon short fiber of the sheath, and the modified cellulose short fiber component by ironing, etc. Alternatively, in order to prevent the high-wet modulus rayon short fiber component from falling off, it is necessary to set the number of twists higher than in the normal case. And in that case, the force that restrains the filament in the core part becomes too high, and the hollow part of the hollow fiber is lost. Therefore, it is difficult to obtain an excellent texture and cannot be employed in the present invention.

  In the long and short composite spun yarn according to the present invention, the mixing ratio of the modified cellulose-based short fiber component or the high-wet modulus rayon short fiber component in the sheath to the entire long and short composite spun yarn is in the range of 40 to 85% by weight. More preferably, it is more preferably in the range of 50 to 70% by weight.

  When the mixing ratio of the modified cellulose short fiber component or the high wet modulus rayon short fiber component is less than 40% by weight, the number of the modified cellulose short fiber component or the high wet modulus rayon short fiber is reduced. In some cases, it may not be possible to obtain a satisfactory covering property. On the other hand, when it exceeds 85% by weight, the influence of the physical properties of the modified cellulosic short fiber component or the high wet modulus rayon short fiber component is dominant. In order to obtain a long and short composite spun yarn having both the coverage by the modified cellulose short fiber component or the high wet modulus rayon short fiber component and the above-described excellent performance. The modified cellulose short fiber component or high wet modulus rayon short fiber component Mixing ratio is more preferably in the range of 50 to 70 wt%.

  Hereinafter, 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, etc. are bonded together, and crimps are developed due to differences in their elastic recovery characteristics and shrinkage characteristics. is there. 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.

  Therefore, as a result of intensive studies to satisfy the above-mentioned properties without impairing the properties of the polyester, the present inventors mainly have polytrimethylene terephthalate (hereinafter abbreviated as PTT) as one component, particularly a high shrinkage component. It was found that the polyester used was used. 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 elastic recovery properties. The elongation recovery property is extremely excellent.

  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 considered to be 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 copolymerizable compounds include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, and 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol, butanediol, and neopentyl glycol. And diols such as cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol, but are not limited thereto. 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 cross section It is more preferable that

  As used herein, the Dharma-shaped cross section is obtained by laminating the interface between the PTT component A and the PET component B as shown in FIG. 1 in a direction intersecting the longitudinal direction of the cross section, preferably in the vertical direction.

  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 crimp phase 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 the single yarn. For example, by arranging the crimp of Z torque of another single yarn at a place where one single yarn exhibits S torque crimp, each other's torque disappears without losing stretch properties, and wrinkles occur. Can be suppressed. It is necessary to disperse the crimping force in order to prevent the crimping phases from being aligned among the single yarns constituting the multifilament. As a means for this, the cross-section of the side-by-side type composite fiber is as shown in FIG. If it is a mold cross section, generation | occurrence | production of wrinkles can be prevented 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 yarn, are strongly entangled with the short fiber component, and excellent in the shape stability of the core-sheath structure, Long and short composite yarns having a feeling of swelling and high stretch can be obtained, and good stretchability can be obtained when a woven fabric is obtained.

Next, the short fiber used for the long and short composite spun yarn of the present invention will be described.
In the present invention, the short fiber is used to constitute the sheath portion of the long / short composite spun yarn and is made of a modified cellulose short fiber or a high wet modulus rayon short fiber. The reason for using these short fibers is that fibrillation is difficult and it is preferable that a resin processing for preventing fibrillation is not required after the dyeing process.

  Here, in the present invention, the modified cellulose short fiber means a short fiber of cellulose fiber modified so as to have a high strength and a high elastic modulus when wet with respect to the cellulose fiber, and the strength at the time of humidity control. In addition, the wet elastic modulus (wet modulus) is modified so as to be 3.3 cN / dtex or more and 0.5 cN / dtex or more, respectively.

  The high-wet modulus rayon fiber refers to one having a tensile strength (cN) per decitex required for 5% elongation of a single fiber of 0.5 cN or more, and if the value is 0.5 cN or more, The fiber shrinkage can be treated as a practically acceptable level, and the short fiber of the fiber means a fiber cut into a finite fiber length corresponding to the desired fiber length as a spun yarn.

  The modified cellulose short fiber or high wet modulus rayon in the sheath preferably has a dry strength of 3.0 cN / dtex or more, and a strength after 5% alkali treatment of 1 cN / dtex or more. It is preferable.

  The cross-sectional shape of the short fiber is not particularly limited, and may be a round shape or a modified shape such as a polygonal shape, an H shape, or a hollow shape. Further, the fineness of the short fibers is not particularly limited, but is preferably in the range of 0.6 to 5 dtex in consideration 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.

  In the long and short composite spun yarn of the present invention, the hollow filament fiber in the core portion preferably accounts for 15 to 60% by weight of the whole spun yarn, and the modified cellulose short fiber or the high wet modulus rayon short fiber in the sheath portion is spun. It accounts for 40 to 85% by weight of the entire yarn.

  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.

  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, a composite fiber filament fiber and a modified cellulose short fiber or a high wet modulus rayon short fiber bonded to a side-by-side type are prepared. The manufacturing method of each fiber may be a conventionally known method.

  Next, these fibers are spun into a long / short composite spun yarn. The spinning method is not particularly limited as long as the resulting long and short composite spun yarn is substantially untwisted, but the modified cellulosic short fiber or the high wet modulus rayon short fiber component is bound by the action of air flow. In a general-purpose air spinning machine that forms spun yarns, the modified cellulose short fibers or high wet modulus are used in front of the yarn forming section through an appropriate feed roller and long fiber equipment such as a yarn path guide. The method obtained by supplying to the center part of a rayon short fiber bundle can be used preferably.

  Particularly preferred is a method using “Murata Vortex Spinner” (Murata Machine Co., Ltd .: hereinafter referred to as MVS). Various spinning methods that utilize the action of airflow have been proposed, developed, and used. However, in order to obtain the long and short composite spun yarns of the present invention, it is essential 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, general short and long composite spun yarns using a ring spinning machine are mixed with a modified cellulose short fiber or high wet modulus rayon short fiber component with a low melting point fiber having a low melting point of preferably 120 ° C. or lower, at a certain ratio. A long and short composite spun yarn having a real twist structure is obtained by a typical manufacturing method. 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 can be fused to the surrounding short fibers and filaments with a hot roller or a hot plate to obtain an untwisted long / short composite spun yarn. In 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, and the temperature setting value of the hot roller or hot plate. is there.

Hereinafter, the present invention will be described in detail with reference to examples.
(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. After complete dewetting, it was immediately 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 based on a four-step evaluation of x: 10 or more places or occurrence of nude yarn, Δ: 5-9 places, ◯: 1-5 places, ◎: 0 places.

(3) Pilling property According to the ICI method of JIS L-1076 (1992), the woven fabric was treated for 10 hours and the knitted fabric was treated for 5 hours to determine the grade.

(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, and dyeing was performed at 120 ° C., and then finish setting was performed by a pin tenter method with dry heat of 160 ° C.

  The obtained fabric was subjected to a sensory test with 10 monitors for the sense of stiffness, lightness, touch and surface, 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 having an intrinsic viscosity (IV) of 1.40 and homo PET having an intrinsic viscosity (IV) of 0.60 were melted separately, and the composite ratio (% by weight) was obtained from a composite spinneret with 24 holes at a spinning temperature of 275 ° C. It was discharged at 50:50, and was taken up at a spinning speed of 1400 m / min to obtain 165 dtex and a 24 filament side-by-side composite structure undrawn yarn (fiber cross section is a Dharma type cross section as shown in FIG. 1). Further, using a hot roll-hot plate drawing machine (filing length: 20 cm, surface roughness: 3S), 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 relaxed by 0.9 times and wound to obtain a 55 dtex, 24-filament drawn yarn. 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%.

  As the short fiber of the long and short composite spun yarn, the modified cellulose short fiber (“Modal” fiber 1.3 dtex × 39 mm: manufactured by LENZING) is used as the short fiber of the long and short composite spun yarn, and 1.0 g through a normal spinning method. A sliver with a thickness of / m was created.

  The 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. A 30's long and short composite spun yarn was obtained with the type 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, the woven structure was changed to 3/1 twill using a normal loom, and a woven fabric having a texture of 283 g / m ² was obtained. 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 very excellent.

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

  Further, as the fabric, 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 swelling feeling, soft stretchability, recoverability and surface feeling were very excellent.

Example 3
In the same manner as in Example 1, except that a sliver with a thickness of 2.0 g / m was prepared so that the mixing ratio shown in Table 1 was set, and the draft rate of the air spinning machine was set to 90 times, 20's long and 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 coverage was good, the swelling feeling, the soft stretchability, the recoverability were excellent, and the surface feeling was very excellent.

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

  The coverage was excellent. Since the mixing ratio of the side-by-side type composite fiber filaments is low, in the sensory evaluation, the swelling feeling, the soft stretch property, and the recoverability are superior to those of the comparative example, but are slightly inferior to those of the first to third examples. However, the surface feeling was very good.

Example 5
A cotton type sliver having a thickness of 0.6 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 200 times by the same method as in Example 1 to count the cotton method. A 70's long / short composite spun yarn was obtained.

  However, since the number of short fibers was small, the covering property was slightly less than that of Examples 1 to 4, and some nude yarn was observed, but it was practical. Further, the feeling of swelling, soft stretchability, recoverability and surface feeling were very excellent.

Comparative Example 1
Using the same short fibers as used in Example 1, a rough yarn having a thickness of 0.35 g / m was prepared through a normal spinning method, and was put on a ring spinning machine. On the other hand, the same side-by-side type composite fiber as used in Example 1 is supplied from 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.

Although the obtained long and short composite spun yarn was excellent in spinnability, the covering property was inferior to that of Example 1, and the binding force to the side-by-side type composite fiber by actual twisting was strong. Although a fabric of m ² was obtained, it was inferior in that it did not have sufficient soft stretch properties, and a good texture could not be obtained even in sensory evaluation.

Comparative Example 2
The same sliver as used in Example 1 was used, and a 30's spun yarn was obtained by applying it to an MVS spinning machine without supplying filaments. In the same manner as in Example 1, a woven fabric having a texture of 287 g / m ² was obtained and evaluated. However, since no side-by-side type composite fiber was used in the center, swelling feeling, soft stretchability, and recoverability were obtained. There was not enough soft stretch property.

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 terms of swell, soft stretch, and recoverability, but was obtained because the viscose rayon short fiber was used. As a result of performing various evaluations on the fabric, viscose rayon short fibers were used, resulting in fibrillation and poor surface feeling.

FIG. 1 is a schematic cross-sectional model diagram of a cross-sectional shape showing an example of a side-by-side type composite fiber that can be used for the long and short composite spun yarn of the present invention.

Explanation of symbols

B: Polytrimethylene terephthalate B: Polyethylene terephthalate

Claims (5)

  One has a composite fiber filament in which two polyester polymers, which are polyesters mainly composed of polytrimethylene terephthalate, are bonded in a side-by-side manner along the fiber length direction. A long and short composite spun yarn comprising a short fiber or a high-wet modulus rayon short fiber and substantially non-twisted.   Side-by-side composite fiber filaments in the core occupy 15 to 60% by weight of the entire spun yarn, and modified cellulose short fibers or high-wet modulus rayon short fibers in the sheath occupy 40 to 85% by weight of the entire spun yarn. The long and short composite spun yarn according to claim 1.   The strength of the modified cellulose short fiber or high wet modulus rayon of the sheath is 3.0 cN / dtex or more in terms of dry strength, and the strength after 5% alkali treatment is 1 cN / dtex or more. The long and short composite spun yarn described.   The long / short composite yarn according to claim 1 or 2, wherein the side-by-side type composite fiber filament has an elongation recovery rate of 80% or more at 20% elongation.   A fabric comprising the long and short composite spun yarn according to any one of claims 1 to 4.

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