JP2007023417A - Moisture-absorbing bulky elastic yarn and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moisture-absorbing bulky elastic yarn preventing grin-through caused by stretching/shrinking, wetting and the like and suitable for being used as a fabric for clothing having adaptability to quick sweating of human body accompanied by exercise and comfortableness in exercise and a method for producing the same. <P>SOLUTION: The moisture-absorbing bulky elastic yarn is prepared by coating a polyester elastic yarn with 2 or more species of crimped yarns comprising a thermoplastic synthetic yarn. The polyester yarn is the moisture-absorbing elastic yarn and the 2 or more species of the crimped yarns are different in length and elongation at break. The method for producing the moisture-absorbing bulky elastic yarn is efficiently produced by simultaneously fiber-mixing and/or interlacing the moisture-absorbing polyester under tension with 2 or more species of the thermoplastic synthetic yarns having difference in elongation and simultaneously processing by drawing and false twisting the yarns. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bulky hygroscopic elastic yarn obtained by covering a polyester hygroscopic elastic yarn with a crimped yarn and a method for producing the same.

  As a method for producing a coated elastic yarn comprising an elastic yarn and a thermoplastic synthetic fiber, a core span method, a covering method using a hollow spindle, and the like are widely known. For example, in the following Patent Document 1 (Japanese Patent Publication No. 50-5305), a coated elastic yarn in which a stretched polyurethane-based elastic yarn is coated so as to twist a thermoplastic non-elastic fiber bundle such as nylon and the like, and its manufacture are disclosed. The law is disclosed. Patent Documents disclose a method for producing such a coated elastic yarn, in which a stretched elastic yarn and a thermoplastic inelastic fiber bundle are aligned and false twisted, and then relaxed.

  However, this method has drawbacks such as slow processing speed and difficulty in handling during knitting and weaving. In addition, when hygroscopic elastic yarn is used, if it has hygroscopic or water-absorbing extensibility, the elastic yarn is stretched during moisture absorption, so that it can be peeled off (between the yarn covered by the elastic yarn of the core). This has a fatal defect in that not only the appearance of the product is impaired and the appearance of the product is impaired, but also the fabric, which is a characteristic of the elastic yarn, may not be restored.

  Further, in the following Patent Document 2 (Japanese Patent Publication No. 60-20489), after blending and entanglement of polybutylene terephthalate and a polyester filament having a higher cutting elongation than the filament, simultaneous stretching false twisting, A method for obtaining a coated braided yarn rich in stretchability is disclosed.

  However, in any of these methods, the elastic yarn is only coated with one type of thermoplastic fiber, and the coating is insufficient, and stress is concentrated on the elastic yarn during knitting / weaving, Misalignment and blindness cannot be prevented. In particular, when an elastic yarn having hygroscopic extensibility is coated with one kind of thermoplastic fiber, the elastic yarn often causes a phenomenon of popping out from the fabric produced by the extensibility. Therefore, these methods are not suitable for coating elastic yarns having hygroscopic extensibility, and it is impossible to obtain a product exhibiting sufficient quality and practicality.

Japanese Patent Publication No. 50-5305 Japanese Patent Publication No. 60-20489

  One object of the present invention is a bulky elastic yarn utilizing the hygroscopic extensibility of a hygroscopic elastic yarn included as a core yarn, which cannot be achieved by a conventional method for producing a coated elastic yarn. , Which can prevent the blindness due to the hygroscopic stretch of the hygroscopic elastic yarn that significantly reduces the quality of the fabric, and the softness and elasticity of the bulky hygroscopic elastic yarn and the resilience of the fabric by following the non-elastic coated yarn against the elongation due to the hygroscopic stretch An object of the present invention is to provide a bulky hygroscopic elastic yarn having a high bulkiness, a soft texture and a spun-like appearance. Another object of the present invention is to provide a method for producing such a bulky hygroscopic elastic yarn efficiently and stably industrially.

  As a result of intensive studies to achieve the above object, the inventors of the present invention are able to prevent the moisture-absorbing elastic yarn from being punctured even in a non-twisted state in a bulky hygroscopic elastic yarn having a multistage stress relaxation function described later. The present invention was completed by investigating that a bulky hygroscopic elastic yarn having a high bulkiness, a soft texture and a spun-like appearance can be obtained, and a good bulky woven or knitted fabric can be obtained.

Thus, according to the present invention,
(1) A bulky hygroscopic elastic yarn obtained by coating an elastic yarn with two or more crimped yarns made of thermoplastic synthetic fiber, wherein the elastic yarn is a polyester hygroscopic elastic yarn, and the two or more crimped yarns A bulky hygroscopic elastic yarn, characterized in that the yarn is two or more types of crimped yarns having a difference in yarn foot and cut elongation between them,
(2) The polyester hygroscopic elastic yarn is a filament yarn made of a polyester elastomer, and has a moisture absorption rate of 1 to 5 wt% at 30 ° C and a relative humidity of 65%, and a moisture absorption rate at 30 ° C and a relative humidity of 95%. The bulky hygroscopic elastic yarn according to (1), wherein the hygroscopic elastic yarn is (6) to 40 wt%, and the difference in moisture absorption under the two conditions is 5 wt% or more,
(3) The polyester hygroscopic elastic yarn is a monofilament yarn having a fineness of 30 to 50 denier (33 to 55 dtex) made of a polyester elastomer, and the monofilament yarn has a moisture absorption rate of 1 at 30 ° C. and a relative humidity of 65%. The bulky moisture absorption of (2) above, wherein the moisture absorption rate at ˜5 wt%, 30 ° C. and relative humidity of 95% is 6 to 40 wt%, and the difference in moisture absorption rate between the two conditions is 5 wt% or more. Elastic yarn,
(4) The crimped yarn of two or more kinds of thermoplastic synthetic fibers covering the polyester elastic yarn is a crimped yarn (A) and a crimped yarn (B) having the following characteristics (a) to (d): There,
(B) The difference in the foot length of the crimped yarn (B) with respect to the crimped yarn (A) is 5% or more. C) Variation in cut elongation of the single fiber constituting the crimped yarn (B) is 10% or more. (D) Stress rate of the crimped yarn (B) is 70% or less. At least the polyester hygroscopic elastic yarn and the crimped yarn. (A) and between the crimped yarn (A) and the crimped yarn (B), a portion partially mixed and entangled, and the cut elongation of the entire yarn is 10 to 70 %, Young's modulus is 800 kg / mm ² or less (7.85 GPa or less), and the crimp rate is 8 to 60%, and the bulky hygroscopic elastic yarn according to any one of the above (1) to (3), and ,
(5) The difference in yarn foot between the crimped yarn (B) and the crimped yarn (A) is in the range of 20 to 100%, and the cut elongation of the single fiber constituting the crimped yarn (B) The bulky hygroscopic elastic yarn according to (4), wherein the variation is in the range of 30 to 100%,
Is provided.

Further, according to the present invention, as a method for efficiently producing a bulky elastic yarn as described above,
(6) Bulky hygroscopic elasticity characterized by simultaneously blending and entanglement of a polyester hygroscopic elastic yarn in tension and two or more thermoplastic synthetic fibers having a difference in cut elongation, and then simultaneously drawing false twisting A method for producing yarn,
(7) The production of a bulky hygroscopic elastic yarn according to (6) above, wherein two or more polyester multifilament yarns having a difference in cut elongation of 50% or more are used as the two or more thermoplastic synthetic fibers. Method,
(8) The method for producing a bulky hygroscopic elastic yarn according to claim 6 or 7, wherein a draw ratio in the simultaneous drawing false twisting is 1.1 to 1.9 times, and
(9) The polyester hygroscopic elastic yarn is a filament yarn made of a polyester-based elastomer, and has a moisture absorption rate of 1 to 5 wt% at 30 ° C and a relative humidity of 65%, and a moisture absorption rate at 30 ° C and a relative humidity of 95%. The method for producing a bulky hygroscopic elastic yarn according to any one of the above (6) to (8), characterized in that it is 6 to 40 wt%, and the difference in moisture absorption under the two conditions is 5 wt% or more. Provided.

When the bulky hygroscopic elastic yarn of the present invention is hygroscopically elongated later, undesired phenomena such as eye-opening observed in the conventional bulky hygroscopic elastic yarn do not occur. Furthermore, the bulky hygroscopic elastic yarn of the present invention can maintain a bulky and soft texture even when subjected to strong twisting. That is, the crimped yarn (A) and the crimped yarn (B) are entangled in a state having an appropriate yarn foot difference, so that there are many interfiber spaces, and such a bulky hygroscopic elasticity. When the yarn is twisted, a so-called twisting phenomenon occurs in the outer peripheral portion as it is. Accordingly, the crimped yarn (B) at the outer peripheral portion can freely move as if there is no twist, so that it is possible to prevent the texture from becoming hard. For this reason, it is useful as a cloth for clothing having both the rapid sweating of the human body accompanying exercise and the comfort of exercise, and at the same time, it becomes a good bulky hygroscopic elastic yarn which is less prone to stretching due to expansion and contraction.
Further, according to the method of the present invention, it is possible to efficiently and stably produce the bulky hygroscopic elastic yarn of the present invention having such various advantages.

  The bulky hygroscopic elastic yarn of the present invention includes a core yarn (polyester hygroscopic elastic yarn) made of polyester hygroscopic elastic fiber as described below and a crimp made of at least two inelastic thermoplastic synthetic fibers covering the outer periphery thereof. Consists essentially of yarn.

(Polyester hygroscopic elastic yarn)
The hygroscopic elastic yarn constituting the core yarn is a fiber made of a polyester-based elastomer and has a cut elongation of 200 to 900% among those having hygroscopicity. As such a core yarn, it is preferable to use a hygroscopic elastic yarn made of a block copolymer polyether ester from the viewpoint of heat resistance and chemical resistance. In particular, a hygroscopic elastic yarn made of a block copolymer polyether ester having polyalkylene terephthalate as a hard segment and polyoxyalkylene glycol as a soft segment is preferable.

  Further, this hygroscopic elastic yarn has a moisture absorption rate of 1 to 5 wt% at 30 ° C. and a relative humidity of 65%, 30 ° C., and a relative humidity of 95 to achieve the purpose of use as a bulky hygroscopic elastic yarn after processing. % Is 6 to 40 wt%, and the difference in moisture absorption under the two conditions is 5 wt% or more, preferably 5 to 50 wt%.

  If the hygroscopic elastic yarn has a moisture absorption rate of less than 1 wt% at 30 ° C. and a relative humidity of 65%, the desired performance cannot be obtained at the time of forming the fabric. If the hygroscopic elastic yarn exceeds 5 wt%, moisture absorption will occur in dyeing after knitting / weaving. The shape of the elastic yarn cannot be maintained, and deformation / modification occurs and the intended fabric cannot be obtained. Further, if the moisture absorption rate at 30 ° C. and relative humidity of 95% is less than 6 wt%, the hygroscopic performance is insufficient and the purpose cannot be achieved, while if it exceeds 40 wt%, deformation / denaturation occurs in the dyeing process. When the difference in moisture absorption rate under the two conditions is less than 5 wt%, sufficient hygroscopicity is not exhibited in the final form of the fabric after knitting / weaving.

  The hygroscopic elastic yarn is self-stretched by moisture absorption, but the difference in hygroscopic elongation under the above two conditions, that is, no load, 30 ° C., relative yarn length at 95% relative humidity and 30 ° C. relative It is preferable to have a moisture absorption self-extension property such that the difference from the yarn length at a humidity of 65% is 5% or more.

The polyester hygroscopic elastic yarn in the present invention is preferably a monofilament yarn having a fineness of 30 to 50 denier (33 to 55 dtex), but may be a multifilament yarn.
Such a polyester hygroscopic elastic yarn can be produced by melt spinning the above polyester elastomer. Usually, after spinning, it is stretched (pre-stretched) and adjusted to a predetermined cut elongation, but the spinning conditions of the hygroscopic elastic yarn are adjusted, and the cut elongation of the hygroscopic elastic yarn is 900% in advance. Hereinafter, if it is preferably reduced to 400 to 800%, such pre-stretching can be omitted.

  The polyester moisture-absorbing elastic yarn is provided with additives such as a modifier, an antioxidant, a flame retardant, an antistatic agent, a fluorescent brightening agent, a colorant, a stabilizer, and inorganic particles as long as the object of the present invention is not impaired. May be included. Further, the shape of the fiber cross section is not limited to a normal circular shape, and a part or all of it may be a non-circular shape such as tri-lobal, multi-lobal, hollow, or flat.

(Crimped yarn)
On the other hand, in the present invention, two or more kinds of crimped yarns, ie, crimped yarns (A) and crimped yarns (B), which are coated yarns covering the periphery of the core yarn, are not limited to the polymers constituting them. The fibers may be composed of different polymers. However, two or more types of polyester fibers that are both made of a polyethylene terephthalate polymer and have different physical properties in the following points are particularly preferable.

  That is, in a good bulky hygroscopic elastic yarn, the difference between the crimped yarn (B) and the crimped yarn (A) should be 5% or more, and the cut elongation difference should be 10% or more. . When the difference in the thread length is less than 5% or the difference in cut elongation is less than 10%, it is difficult to provide a multistage stress relaxation function described later. However, if these values are too large, it may cause yarn misalignment or the like, and therefore, the difference in yarn foot is preferably 100% or less and the cut elongation is preferably 150% or less. Further, the variation in the cut elongation of the crimped yarn (B) needs to be 10% or more. If this variation is less than 10%, the crimped yarn (B) has too much stress and a soft and smooth stretch feeling cannot be obtained. However, if the variation is too large, single yarn breakage or the like will occur, so it is preferable to keep the maximum value of the variation below 100%. A particularly preferable range is that the difference between the crimped yarn (B) and the crimped yarn (A) is 20 to 100%, and the variation in the cut elongation of the single fibers constituting the crimped yarn (B) is 30 to 100. %.

  Furthermore, in the present invention, the stress rate of the crimped yarn (B) is desirably 70% or less, particularly 30 to 60%. The stress rate here is the ratio of 10% elongation stress to cutting stress. When this value exceeds 70%, soft stretch performance cannot be obtained.

  The crimped yarn (A) and the crimped yarn (B) having such physical properties include the spinning speed, the draw ratio and the draw temperature of the thermoplastic synthetic fiber multifilament, or the draw ratio at the time of simultaneous drawing false twisting, and a heating plate. It can be obtained by appropriately adjusting the temperature, the peripheral speed of the false twist disk, and the like.

  Preferred crimped yarns (A) and crimped yarns (B) are false twisted crimped yarns made of thermoplastic synthetic fiber multifilaments. For example, polyester multifilament semi-drawn yarns are used for forming crimped yarns (A). A simultaneous drawing false twisting process may be performed by using an undrawn polyester multifilament yarn as a raw yarn (a in FIG. 1) and a crimped yarn (B) forming yarn (b in FIG. 1). At this time, a difference in cut elongation between the thermoplastic synthetic fiber multifilaments (raw yarns) needs to be 50% or more. If this difference is less than 50%, it is desirable for the crimped yarn (A) and the crimped yarn (B). It is difficult to provide a difference in thread length and a difference in cut elongation.

  Here, the semi-drawn yarn is POY obtained by high-speed spinning or one that has been drawn to a degree that causes a relatively low molecular orientation after spinning at a normal speed, and has a cut elongation of 50 to 200%. Collectively refers to things. The undrawn yarn refers to a fiber in which no substantial molecular orientation occurs, and usually refers to a fiber having a cut elongation exceeding 200%.

The suitable fineness of the crimped yarn (A) and the crimped yarn (B) is in the range of 50 to 150 denier (55 to 167 dtex) as the fineness after the simultaneous drawing false twisting.
In one or both of the crimped yarn (A) and the crimped yarn (B), a modifier, an antioxidant, a flame retardant, an antistatic agent, a fluorescent brightening agent, and the like within a range not impairing the object of the present invention, Coloring agents, stabilizers, inorganic particles and the like may be included. Further, the cross section of the fiber is not limited to a normal circular shape, and a part or all of the cross section may be non-circular such as trilobal, multi-global, hollow, and flat.
Furthermore, in the present invention, as long as the above conditions are satisfied, at least one of the crimped yarn (A) and the crimped yarn (B) may be composed of two or more kinds of fibers.

(Bulky hygroscopic elastic yarn)
As described above, the bulky hygroscopic elastic yarn of the present invention preferably has a breaking elongation of 10 to 70%, particularly 20 to 60%, as the bulky hygroscopic elastic yarn. When the elongation at break is less than 10%, cutting occurs before the elongation effect of the hygroscopic elastic yarn appears. On the other hand, when the elongation exceeds 70%, the hygroscopic elastic yarn is excessively stressed and only deteriorates the hygroscopic elastic yarn. In addition, the restoring force may be weakened to cause plastic deformation.

Further, the crimp rate of the bulky hygroscopic elastic yarn is in the range of 8 to 60%, preferably 20 to 45%. If the crimp rate is less than 8%, the stretchability is impaired. On the other hand, if it exceeds 60%, the hygroscopic elastic yarn is excessively advanced, which is not preferable. Furthermore, the Young's modulus is 800 kg / mm ² or less (7.85 GPa or less), preferably 400 to 700 kg / mm ² (3.9 to 6.87 GPa). If the Young's modulus exceeds the above upper limit, a strong force is required to elongate, and it is difficult to obtain good stretch performance.

  Furthermore, the bulky hygroscopic elastic yarn of the present invention has a mixed / entangled portion between the polyester hygroscopic elastic yarn and the crimped yarn (A) and between the crimped yarn (A) and the crimped yarn (B). In this way, it has a mixed fiber / entangled part, and the crimped yarn (A) and the crimped yarn (B) have the above-described difference between the foot and the cut elongation, so that multistage stress relaxation is achieved. The function works, and not only can prevent eye-opening even in a non-twisted state, but also prevents eye-opening even when moisture absorption is extended, and a soft and smooth stretch characteristic excellent in wearing feeling can be obtained.

  The term “multi-stage stress relaxation function” as used herein means that when a bulky hygroscopic elastic yarn is stretched, the hygroscopic elastic yarn at the core is first stretched, and then the tensile stress is transmitted to the crimped yarn (A). It is a function that enables the bulky hygroscopic elastic yarn as a whole to resist extension stress, such that the next crimped yarn (B) further elongates while the crimp of (A) resists extension stress. .

  Similarly, when the hygroscopic elastic yarn causes hygroscopic elongation, when the hygroscopic elastic yarn undergoes hygroscopic elongation, first, the elongation stress is transmitted to the crimped yarn (A), and the crimped yarn (A) becomes the hygroscopic elastic yarn. It is also a function that the next crimped yarn (B) is further elongated while resisting the elongation stress. Furthermore, in the bulky hygroscopic elastic yarn of the present invention, the crimped yarn (B) has physical properties that are liable to cause stress dispersion, so that a soft and smooth stretch feeling can be imparted.

On the other hand, when a bulky hygroscopic elastic yarn is produced by the conventional method for producing a coated elastic yarn, the covering of the braided yarn is insufficient, and only the elastic yarn resists the extension stress and is stretched more than necessary. For this reason, the deterioration is accelerated, and a phenomenon such as blindness occurs particularly when the moisture absorption and elongation later occur.
In other words, the aforementioned multistage stress relaxation function is
1) Appropriate blending and entanglement in the hygroscopic elastic yarn and the crimped yarn (A) and the crimped yarn (B) 2) A specific yarn for the crimped yarn (A) and the crimped yarn (B) The present invention is obtained for the first time by satisfying the three requirements of providing the foot difference and the cut elongation, and 3) providing the crimped yarn (B) with physical properties that are likely to cause stress dispersion. For the first time in the bulky hygroscopic elastic yarn according to the present invention.

  Furthermore, the bulky hygroscopic elastic yarn of the present invention can maintain a bulky and soft texture even if it is strongly twisted in the subsequent twisting process. That is, since the crimped yarn (A) and the crimped yarn (B) are entangled in a state where there is a difference in the length of the yarn, there are many interfiber spaces, and such a bulky hygroscopic elastic yarn is twisted. In this case, a so-called twisting phenomenon occurs in which the crimped yarn (B) remains in the outer peripheral portion as it is. Accordingly, the crimped yarn (B) at the outer peripheral portion can freely move as if there is no twist, so that it is possible to prevent the texture from becoming hard.

(Production method)
Hereinafter, the manufacturing method of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a simplified side view of a production apparatus representing an embodiment of the production method of the present invention, in which 1 is a polyester hygroscopic elastic yarn, 2 is a first roller, 3 is a second roller, 4 Is a third roller, 5 is an entanglement nozzle, 6 is a drawing roller, 7 is a false twist disk, 8 is a heating plate, 9 is a scraper, and 10 is a bulky hygroscopic elastic yarn package. Moreover, a and b show the raw yarn (feed yarn) before processing which consists of a thermoplastic synthetic fiber from which a physical property differs, respectively.

According to the production method of the present invention, the polyester hygroscopic elastic yarn 1 is stretched 2 to 5 times between the first roller 2 and the second roller 3, and then the thermoplastic synthetic fibers a and b are supplied. The interlacing nozzle (interlace nozzle) 5 provided between the roller 3 and the third roller 4 is mixed and entangled by the action of compressed air. The pressure pressure at this time is suitably 1 to 6 kgf / cm ² and the overfeed rate is suitably 0.5 to 4%.

  By performing the entanglement process, it is possible to prevent the gap between the yarns and to significantly reduce the yarn breakage during the subsequent drawing false twisting. After the entanglement process, simultaneous stretching false twisting is performed using a heating plate 8 and a false twisting disk 7 provided between the third roller 4 and the stretching roller 6. The temperature of the heating plate 6 may be appropriately set at a temperature at which heat setting is possible within a range in which the hygroscopic elastic yarn and the thermoplastic synthetic fiber a or b do not cause fusion or deterioration, but is preferably 100 to 200 ° C.

  The draw ratio at this time may be appropriately set according to the cut elongation of the thermoplastic synthetic fiber to be used and the elasticity of the intended bulky hygroscopic elastic yarn, but is preferably 1.1 to 1.9 times. . The peripheral speed of the false twist disk 7 is preferably about twice the yarn speed. The entangled yarn subjected to false twisting, heat fixing and untwisting by this simultaneous drawing false twisting process is taken up by a take-off machine 9 to obtain a bulky hygroscopic elastic yarn 10.

  The thermoplastic synthetic fiber multifilament includes a modifier, an antioxidant, a flame retardant, an antistatic agent, a fluorescent whitening agent, a colorant, a stabilizer, inorganic particles, etc., as long as the object of the present invention is not impaired. May be added.

  The thermoplastic synthetic fiber multifilament may be spun from the same spinneret. For example, the molten polymer disclosed in Japanese Patent Publication No. 2-8043 is needle-shaped in the normal spinning hole and the central part. If we adopt a melt spinning method in which the latter spun yarn is spun out at a low elongation by pulling out the product from the spinning hole with a structure protruding downward from the base, and both yarns are pulled at the same speed. Since a raw yarn coexisting with fibers having different cutting elongations can be obtained, if this is used, one raw yarn creel in the simultaneous drawing false twisting process can be omitted, and workability is improved.

  Of course, in the production method of the present invention, it is possible to use separately produced yarns, for example, a polyester multifilament semi-drawn yarn as a crimped yarn (A) forming yarn (a in FIG. 1). , And using a polyester multifilament undrawn yarn as the crimped yarn (B) forming yarn (b in FIG. 1) can be simultaneously drawn false twisting. At this time, the difference in cut elongation between the thermoplastic synthetic fiber multifilaments (raw yarns) needs to be 50% or more, preferably 50 to 200%, and if this difference is less than 50%, the crimped yarn (A ) And the crimped yarn (B), it becomes difficult to give a desired difference in yarn foot and cut elongation.

  In the above example, both the crimped yarn (A) and the crimped yarn (B) are polyester fibers. However, as long as the conditions specified in the present invention are satisfied, fibers made of other types of polymers may be combined. For example, nylon fibers having different cutting elongations may be used, or polyester fibers and nylon fibers may be combined.

Hereinafter, the present invention will be described specifically by way of examples. Each physical property shown in the examples is a value measured by the following method.
(1) Moisture absorption rate of the hygroscopic elastic yarn The polyester hygroscopic elastic yarn constituting the bulky hygroscopic elastic yarn is taken out, washed thoroughly with petroleum ether and made dry, and the weight is measured as W _0, and then 30 ° C, the weight after holding for 24 hours in an atmosphere of 65% relative humidity and measuring W _1. The moisture absorption rate at 30 ° C. and a relative humidity of 95% is the measurement W ₂ after the treatment, and the weight after being kept in an atmosphere of 30 ° C. and a relative humidity of 95% for 24 hours. From these measured values, the moisture absorption rate is calculated by the following equation.

(2) Cut elongation of bulky hygroscopic elastic yarn About bulky hygroscopic elastic yarn after simultaneous drawing false twisting, using Toyo Baldwin tensile tester (type RTM-100), sample length 250 mm, tensile speed 200 mm / min. Measure with. Since the bulky elastic yarn of the present invention has a multi-stage stress relaxation function, the breaking of the constituent fibers sequentially breaks and the breaking point becomes unclear. Therefore, the elongation at the maximum stress point is defined as the cutting elongation. The measurement was carried out 10 times and expressed as the average value.

(3) Young's modulus of bulky hygroscopic elastic yarn Initial stage of unloading curve recorded using Toyo Baldwin tensile tester (type RTM-100) under conditions of sample length 250mm, tensile speed 50mm / min, chart speed 200mm / min. It is calculated from the maximum value of the gradient by a conventional method. The measurement was carried out 10 times and expressed as the average value.

(4) Crimp rate After making a bulky hygroscopic elastic yarn into a cocoon shape and suspending a light load of 2 mg / denier on this cocoon, further suspending 0.2 g / denier load and letting it stand for 1 minute length L Read ₀ . Next, remove the heavy load, treat in boiling water for 20 minutes, remove it, remove the light load and air dry for 24 hours. Hung light load and heavy load air-dried, reads the length L ₁ after standing one minute, then remove the heavy loads, it reads the length L ₂ of the skein. From these measured values, the crimp rate is calculated by the following equation. The measurement is carried out 5 times and expressed as an average value.

(5) Thread foot difference 50 cm of bulky hygroscopic elastic yarn is taken out and a load of 0.2 g / denier is hung on one end of the yarn. Next, marking is performed at an interval of 5 cm on a substantially middle portion of the yarn, and this portion is cut out to obtain a sample. Ten single fibers of the crimped yarn (A) and the crimped yarn (B) are taken out from the sample, and the length is measured by hanging a 1/30 / denier load. When the average lengths of the single fibers of the crimped yarn (A) and the crimped yarn (B) are L _A and L _B , respectively, the yarn foot difference is calculated by the following equation. The measurement was carried out 10 times and expressed as an average value.

(6) Cutting elongation of crimped yarn Using the Toyo Baldwin tensile tester (type RTM-II-20), the above sample was measured per 10 single fibers under the conditions of a sample length of 20 mm and a tensile speed of 200 mm / min. Then, the elongation at the maximum stress point is taken as the cutting elongation, and the average value of 10 is obtained. The measurement is carried out 5 times and expressed as an average value.

(7) Variation in cut elongation of single fibers Using the Toyo Baldwin tensile tester (type RTM-II-20), the above-mentioned sample is per 10 single fibers under the conditions of a sample length of 20 mm and a tensile speed of 200 mm / min. The measurement is performed, and the difference R between the maximum value H and the minimum value L in 10 is obtained by using the elongation at the maximum stress point as the cutting elongation. The measurement is carried out 5 times and expressed as an average value.

(8) Stress rate of crimped yarn From the above-mentioned sample, the average stress value σ10 at the time of 10% elongation and the average value σB of the cutting stress were obtained from the load elongation curve obtained by the tensile test in (7) above. Calculate the stress factor. The measurement is carried out 5 times and expressed as an average value.

[Example 1]
(Manufacture of hygroscopic elastic yarn)
As the hygroscopic elastic yarn 1, an unstretched monofilament having a fineness of 40 denier (44 dtex) and a cutting elongation of 700% made of a block copolymer polyether ester having polybutylene terephthalate as a hard segment and polyoxyethylene glycol as a soft segment is used. A polyester multifilament semi-drawn yarn a having a fineness of 115 denier (127 dtex) / 15 filament and a cut elongation of 135% is used as a raw yarn for the crimped yarn (A). As the yarn, polyester multifilament undrawn yarn b having a fineness of 150 denier (165 dtex) / 48 filament and a cut elongation of 330% was supplied to the apparatus shown in FIG.

First, the hygroscopic elastic yarn 1 is stretched four times by the first roller 2 and the second roller 3, and the stretched hygroscopic elastic yarn is then upstream of the second roller 3 with the two types of polyester multifilaments a and b. To a yarn that has been converged under the conditions of a pneumatic pressure of 4 kgf / cm ² and an overfeed rate of 2.5% through an interlace nozzle 5 provided between the second roller 3 and the third roller 4. About 60 units / m of confounding was given. Next, the third roller 4, the stretching roller 6, and the heating plate 8 provided between the two rollers and the false twisting disk 7 are subjected to simultaneous stretching false twisting to perform false twisting, heat fixing, and untwisting, and then torsion The bulky hygroscopic elastic yarn 10 was obtained by scraping with a machine 9. The draw ratio at the drawing false twisting stage was 1.6 times, the temperature of the heating plate was 160 ° C., the peripheral speed of the false twisting disk was 600 m / min, and the drawing roller speed was 300 m / min.

The resulting bulky hygroscopic elastic yarn had a cut elongation of 35%, a Young's modulus of 300 kg / mm ² (2.94 GPa), and a crimp rate of 35%. The cut elongation of the crimped yarn (A) from the semi-drawn yarn a is 45%, the cut elongation of the crimped yarn (B) from the undrawn yarn b is 70%, and the difference is 25%. The difference between the crimped yarn (B) and the crimped yarn (A) was 30%, the variation in the cut elongation of the crimped yarn (B) was 45%, and the stress rate was 38%.
The characteristics of the polyester hygroscopic elastic yarn 1 were as shown in Example 1 in the “Polyester elastic yarn” column of Table 1.

(Manufacture and evaluation of textiles)
This bulky hygroscopic elastic yarn (coated elastic yarn) is spun at 150 t / m and woven into a plain weave at a density of 100 warps / inch and 60 wefts / inch, and then refining, presetting and dyeing according to conventional methods The final set was done. The obtained woven fabric had a soft and spun-like texture and appearance, and exhibited good stretchability. In addition, as a result of observing the appearance of the woven fabric when stretched by 30% in the warp and weft directions, no occurrence of eye-opening was observed. Moreover, as a result of observing the appearance immediately after taking out the fabric after being immersed in water at 25 ° C. for 30 minutes and after being kept in an atmosphere of 30 ° C. and 65% relative humidity for 24 hours, No occurrence was observed (see Example 1 column in Table 2).

[Example 2]
(Manufacture of hygroscopic elastic yarn)
Using the same polyester hygroscopic elastic yarn as in Example 1, as a crimped yarn (A) (B) raw yarn, a polyester multifilament drawn yarn a having a fineness of 90 denier (99 dtex) / 12 filament and a cutting elongation of 80% and A bulky hygroscopic elastic yarn 10 was obtained in the same manner as in Example 1 using a polyester multifilament semi-drawn yarn b having a fineness of 120 denier (132 dtex) / 36 filaments and a cut elongation of 190%. At this time, the draw ratio of the elastic yarn is 4 times, the air pressure of the interlace nozzle is 5 kgf / cm ² , the overfeed rate is 2%, the simultaneous draw false twist ratio is 1.25 times, the heating plate temperature is 200 ° C., The peripheral speed of the twisted disk was 1400 m / min, and the stretching roller speed was 700 m / min.

The resulting bulky hygroscopic elastic yarn had a cut elongation of 45%, a Young's modulus of 500 kg / mm ² (4.90 GPa), and a crimp rate of 25%. Further, the cut elongation of the crimped yarn (A) is 35%, the cut elongation of the crimped yarn (B) is 70%, and the difference between the crimped yarn (B) and the crimped yarn (A) is 20%. %, Variation in cutting elongation was 30%, and stress rate was 42%.

(Manufacture and evaluation of textiles)
This bulky hygroscopic elastic yarn (coated elastic yarn) is spun at 1500 t / m and woven into a plain weave at a density of 90 warps / inch and 55 wefts / inch, and then refining, presetting and dyeing according to conventional methods The final set was done. The obtained woven fabric had a soft and spun-like texture and appearance, and exhibited good stretchability. In addition, as a result of observing the appearance of the woven fabric when stretched by 30% in the warp and weft directions, no occurrence of eye-opening was observed. Moreover, as a result of observing the appearance immediately after taking out the fabric after being immersed in water at 25 ° C. for 30 minutes and after being kept in an atmosphere of 30 ° C. and 65% relative humidity for 24 hours, No occurrence was observed (see Example 2 column in Table 2).

[Comparative Example 1]
Using the same hygroscopic elastic yarn as in Example 1, using only one polyester multifilament drawn yarn having a fineness of 225 denier (248 dtex) / 36 filaments and a cut elongation of 130% as the original yarn for crimped yarn, A coated hygroscopic elastic yarn 10 was obtained in the same manner as in Example 1. At this time, the draw ratio of the elastic yarn is 3 times, the air pressure of the interlace nozzle is 3 kgf / cm ² , the overfeed rate is 2%, the simultaneous draw false twist ratio is 1.5 times, the heating plate temperature is 150 ° C. The peripheral speed of the twisted disk was 600 m / min, and the stretching roller speed was 300 m / min. The resulting coated hygroscopic elastic yarn had a cut elongation of 30%, a Young's modulus of 900 kg / mm ² (8.83 GPa), and a crimp rate of 10%.

  This coated elastic yarn is subjected to S twist of 150 t / m and woven into a plain weave at a density of 103 warps / inch and 63 wefts / inch, and then refined, preset, dyed, and final set in the same manner as in Example 1. Went. The obtained woven fabric was incompletely covered with the hygroscopic elastic yarn, had low quality, and lacked smoothness. Further, as in Example 1, when 30% elongation was given in the warp and weft directions of the woven fabric, the occurrence of blinding was observed. Moreover, as a result of observing the appearance immediately after taking out the fabric after being immersed in water at 25 ° C. for 30 minutes and after being kept in an atmosphere of 30 ° C. and 65% relative humidity for 24 hours, Generation | occurrence | production was seen (refer the comparative example 1 column of Table 2).

[Comparative Example 2]
As a polyester hygroscopic elastic yarn, a block copolymer polyether ester unstretched monofilament (40 denier) having a breaking elongation of 950%, polybutylene terephthalate as a hard segment, and polyoxyethylene glycol as a soft segment, 30 ° C., relative A hygroscopic elastic yarn having a moisture absorption rate of 7 wt% at a humidity of 65%, 30 ° C. and a moisture absorption rate of 45 wt% at a relative humidity of 95% is used, and the crimped yarn has a cut elongation of 135% and a fineness of 115 denier (127 Decitex) / 15 filament polyester multifilament semi-drawn yarn and bulky hygroscopic elastic yarn in the same manner as in Example 1 using a 150 denier (165 dtex) / 48 filament polyester multifilament undrawn yarn with a cut elongation of 330% 10 was obtained. At this time, the draw ratio of the hygroscopic elastic yarn is 4 times, the air pressure of the interlace nozzle is 4 kgf / cm ² , the overfeed rate is 2.5%, the simultaneous draw false twist ratio is 1.6 times, and the temperature of the heating plate is 160 C., the peripheral speed of the false twist disk was 600 m / min, and the stretching roller speed was 300 m / min.

The bulky hygroscopic elastic yarn (coated elastic yarn) obtained had a cut elongation of 37%, a Young's modulus of 300 kg / mm ² (2.94 GPa), and a crimp rate of 35%. Further, the cut elongation of the crimped yarn (A) is 45%, the cut elongation of the crimped yarn (B) is 70% and the difference is 25%. The crimped yarn of the crimped yarn (B) ( The difference in thread length with respect to A) was 30%, the variation in cut elongation was 45%, and the stress rate was 38%.

  This bulky hygroscopic elastic yarn (coated elastic yarn) is subjected to S twist of 150 t / m and woven into a plain weave at a density of 100 warps / inch and 60 wefts / inch. Setting, staining, and final setting were performed.

  The obtained woven fabric was incompletely covered with the hygroscopic elastic yarn, had low quality, and lacked smoothness. Further, as in Example 1, when 30% elongation was given in the warp and weft directions of the woven fabric, the occurrence of blinding was observed. Moreover, as a result of observing the appearance immediately after taking out the fabric after being immersed in water at 25 ° C. for 30 minutes and after being kept in an atmosphere of 30 ° C. and 65% relative humidity for 24 hours, Generation | occurrence | production was seen (refer the comparative example 2 column of Table 2). The characteristics of the polyester hygroscopic elastic yarn were as shown in Comparative Example 2 in the “Polyester elastic yarn” column of Table 1.

[Comparative Examples 3 to 5]
A bulky hygroscopic elastic yarn was produced in the same manner as in Example 1 by using the hygroscopic elastic yarn having a moisture absorption rate shown in the columns of Comparative Examples 3 to 5 in Table 1 when producing the polyester hygroscopic elastic yarn. For all bulky hygroscopic elastic yarns, a woven fabric was prepared in the same manner as in Example 1, and refining, pre-setting, dyeing, and final setting were performed in the same manner as in Example 1. The obtained woven fabric was incompletely covered with the hygroscopic elastic yarn, had low quality, and lacked smoothness. In addition, as in Example 1, when 30% elongation was applied in the warp and weft directions of the woven fabric, generation of blinding was observed in any bulky hygroscopic elastic yarn. Moreover, as a result of observing the appearance immediately after taking out the fabric after being immersed in water at 25 ° C. for 30 minutes and after being kept in an atmosphere of 30 ° C. and 65% relative humidity for 24 hours, any bulky hygroscopic elastic yarn Also, in both states, the occurrence of blinding was observed (see Comparative Examples 3 to 5 in Table 2).

  According to the present invention, it is possible to obtain a bulky hygroscopic elastic yarn that is suitable for use as a cloth for clothing having both the rapid sweating of the human body accompanying exercise and the exercise comfort thereof, and prevents the eyes from being blown by stretching, water immersion, etc. It is useful in the textile and apparel field for clothing using bulky hygroscopic elastic yarn.

The simplified side view of the apparatus used for manufacture of the bulky hygroscopic elastic yarn of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Polyester hygroscopic elastic yarn 2 1st roller 3 2nd roller 4 3rd roller 5 Entangling nozzle 6 Stretching roller 7 False twist disk 8 Heating plate 9 Pulling machine 10 Bulky hygroscopic elastic yarn a Thermoplastic synthetic fiber (semi-stretched yarn)
b Thermoplastic synthetic fiber (undrawn yarn)

Claims (9)

  A bulky hygroscopic elastic yarn obtained by coating an elastic yarn with two or more types of crimped yarns made of thermoplastic synthetic fibers, wherein the elastic yarn is a polyester hygroscopic elastic yarn, and the two or more types of crimped yarns are respectively A bulky hygroscopic elastic yarn characterized by being two or more types of crimped yarns having a difference in yarn foot and cut elongation between them.   The polyester hygroscopic elastic yarn is a filament yarn made of a polyester-based elastomer and has a moisture absorption rate of 1 to 5 wt% at 30 ° C and a relative humidity of 65%, and a moisture absorption rate of 6 to 40 wt% at 30 ° C and a relative humidity of 95%. The bulky moisture-absorbing elastic yarn according to claim 1, wherein the difference in moisture absorption under the two conditions is 5 wt% or more.   The polyester hygroscopic elastic yarn is a monofilament yarn having a fineness of 30 to 50 denier (33 to 55 dtex) made of polyester elastomer, and the monofilament yarn has a moisture absorption rate of 1 to 5 wt% at 30 ° C and a relative humidity of 65%. The bulky hygroscopic elastic yarn according to claim 1, wherein the moisture absorption rate at 30 ° C and 95% relative humidity is 6 to 40 wt%, and the difference in moisture absorption rate between the two conditions is 5 wt% or more. . The crimped yarns of two or more kinds of thermoplastic synthetic fibers covering the polyester elastic yarn are the crimped yarn (A) and the crimped yarn (B) having the following characteristics (a) to (d), Including at least a portion where the polyester hygroscopic elastic yarn and the crimped yarn (A) are partially mixed / entangled between the crimped yarn (A) and the crimped yarn (B), and the entire yarn The elongation at break is 10 to 70%, the Young's modulus is 800 kg / mm ² or less (7.85 GPa or less), and the crimping rate is 8 to 60%. The bulky hygroscopic elastic yarn according to claim 1.
(B) The difference in the foot length of the crimped yarn (B) with respect to the crimped yarn (A) is 5% or more. C) Variation in the cut elongation of the single fibers constituting the crimped yarn (B) is 10% or more. (D) The stress rate of the crimped yarn (B) is 70% or less.   The difference in yarn foot between the crimped yarn (B) and the crimped yarn (A) is in the range of 20 to 100%, and the variation in the cut elongation of the single fibers constituting the crimped yarn (B) is 30 to 100. The bulky hygroscopic elastic yarn according to claim 4, which is in the range of%.   Production of a bulky hygroscopic elastic yarn characterized by simultaneously blending and entanglement of a polyester hygroscopic elastic yarn in tension and two or more thermoplastic synthetic fibers having a difference in cut elongation at the same time, followed by false drawing. Method.   The method for producing a bulky hygroscopic elastic yarn according to claim 6, wherein two or more types of polyester multifilament yarns having a cut elongation difference of 50% or more are used as the two or more types of thermoplastic synthetic fibers.   The method for producing a bulky hygroscopic elastic yarn according to claim 6 or 7, wherein a draw ratio in the simultaneous drawing false twisting is in a range of 1.1 to 1.9 times.   The polyester hygroscopic elastic yarn is a filament yarn made of a polyester-based elastomer and has a moisture absorption rate of 1 to 5 wt% at 30 ° C and a relative humidity of 65%, and a moisture absorption rate of 6 to 40 wt% at 30 ° C and a relative humidity of 95%. The method for producing a bulky hygroscopic elastic yarn according to any one of claims 6 to 8, wherein the difference in moisture absorption under the two conditions is 5 wt% or more.

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