JP2007162180A - False twisted yarn and woven or knitted fabric, and method for producing false-twisted yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a false-twisted yarn which comprises real twisted portions twisted in a false-twisting direction, real twisted portions twisted in a direction opposite to the false-twisting direction, and bulky twisted portions, and can give a woven or knitted fabric exhibiting suitable grain touch, body touch, swollen touch and stretchability. <P>SOLUTION: This false-twisted yarn which comprises a thermoplastic multifilament yarn and comprises the first real twisted portions twisted in a false-twisting direction, the second real twisted portions twisted in a direction opposite to the false-twisting direction, and bulky twisted portions formed between the first real twisted portions and the second real twisted portions is characterized in that the total average real twist number (t/m) of the first real twisted portions and the second real twisted portions is 6,000 to 10,000/√T [T is a total fineness (dtex)]. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a false knitted yarn capable of providing a woven or knitted fabric having a moderate texture, harshness, fluffiness, and stretchability, and a woven or knitted fabric including the false knitted yarn, and the false twist. The present invention relates to a method for manufacturing a yarn.

  Conventionally, pre-twisted false twisted yarns in which untwisted and overtwisted portions are alternately formed have been widely used as processed yarns that can impart textures of texture, harshness, and softness to woven and knitted fabrics. The pre-twisted false-twisted yarn is generally obtained by subjecting a twisted yarn with a pre-twist to false twisting in the same direction as the pre-twisted direction. However, such a pre-twisted false-twisted yarn requires a twisted yarn with a pre-twist applied in the production process, and thus has a disadvantage that the productivity is extremely low. When the knitted fabric is knitted, there is also a drawback that the obtained knitted fabric is hardened.

  On the other hand, Japanese Patent Laid-Open No. 2000-336538 discloses a method of manufacturing a false twisted yarn in which an untwisted part and an overwound twisted part are formed by performing false twisting while omitting the first twisting process. Document 1). In the false twisted yarn manufacturing method described in Patent Document 1, entangled portions are individually formed by pressurized air on undrawn yarns composed of two types of polyester single fiber groups having different dyeing concentrations or dyeability. Thereafter, thick spots are imparted by semi-stretching, and then the false twisting temperature (softening point−50 ° C.) to (softening point−10 ° C.) is applied to the half-stretched yarn. ) Is 15,000 / √T to 26000 / √T (T: decitex). Thereby, a partial fusion false twisting process in which a fusion portion having a twist in the false twist direction as an untwisted portion and a non-fuse portion having a crimp in the crimped and untwisted direction as an over twist portion are formed. Yarn is obtained. According to Patent Document 1, the false twisted yarn obtained in this manner is a polyester partially fused false twisted yarn having both a strong twisted texture, an appropriate sharpness, and a high multicolor effect. Yes.

  Japanese Patent Application Laid-Open No. 54-88337 (Patent Document 2) discloses a method for producing a non-bulky and strong twisted processed yarn close to the texture of a real twist by omitting the first twisting step. In the method for producing a strongly twisted yarn described in Patent Document 2, turbulent air treatment is performed on one or more multifilament yarns including thermoplastic fibers, and the entanglement indicated by the hook drop value is performed. The interlace yarn having a degree of 5.0 cm or less is subjected to false twisting at a temperature not lower than the softening point and not higher than the melting point of the thermoplastic fiber. By performing false twisting at a temperature at which the fibers partially fuse with respect to the interlace yarn in which a high degree of entanglement is formed in this way, a part having bulkiness is not substantially formed, A non-bulky strong twisted yarn close to the texture of a real twist having S and Z twisted portions (twisted portions in the false twist direction and untwisted direction) and untwisted non-bulky entangled portions can be obtained with high productivity.

  Furthermore, in Japanese Patent Application Laid-Open No. 55-67025 (Patent Document 3), in order to obtain a woven or knitted fabric having a real twisted texture and light wrinkles, the fusion between fibers is minimized as much as possible during false twisting. Thus, a real twisted false twisted yarn in which an untwisted portion and an overwound portion are formed is described. According to Patent Document 3, conventionally, when a false twisted yarn is manufactured by applying false twisting to a multifilament yarn, the fiber is partially fused using a spindle type false twisting device. When false twisting is performed under a high heating temperature, there is a problem that even if a woven or knitted fabric is knitted with the obtained false twisted yarn, it cannot give a real twisted yarn-like texture or light wrinkles. .

  For this reason, in order to solve the above problems, Patent Document 3 supplies undrawn yarn as a supply yarn to a friction false twisting device so that the friction false twisting device does not cause yarn ballooning in a steady state. A false twisted yarn is manufactured by performing a false false twist process. At this time, the number of false twists is 21000 / √D (D: denier) or more, and the false twist temperature is set to a temperature at which the fibers are not fused during false twisting.

  Thus, the untwisted portion of the tight twisted yarn structure in which the twist density is 21000 / √D and the crimped form of the fiber matches the twisted structure of the yarn, and the twist in the opposite direction to the untwisted portion And false twisted yarns that are alternately free of untwisted yarn structure portions other than both of these structures. can get. According to Patent Document 3, a woven or knitted fabric obtained using such a false twisted yarn has a real twisted yarn-like texture and light wrinkles. Moreover, since the false twisted yarn described in Patent Document 3 imparts a feeling of fluffiness to a woven or knitted fabric and further has a real twisted portion, it can also be expected to impart a feeling of tension.

  Furthermore, JP-A-1-52833 (Patent Document 4) manufactures a pre-twisted false twisted yarn that is simple and efficient in production, omitting the pre-twisting process, and is comparable to conventional pre-twisted false twisted yarn. A possible method is disclosed. The production method described in Patent Document 4 was found by analyzing the expression mechanism of the grain appearance in the pre-twisted twisted yarn, and specifically, between a predetermined birefringence and a single fiber. A false twisted yarn is produced by subjecting an original yarn composed of a multifilament having a difference in birefringence to entanglement of 30 pcs / m or more and then drawing a false twist.

In this way, by providing entanglement in advance before drawing false twisting, at the time of false twisting, the provision of crimped crimps is prevented at the entangled part, while at the part where no entanglement is provided, a single yarn layer Metastasis occurs and crimps are applied. As a result, a false twisted yarn having a crimped crimp shape changed in the length direction of the multifilament is obtained. By knitting the knitted fabric using the false twisted yarn, the woven / knitted fabric has an uneven texture Is supposed to develop.
JP 2000-336538 A JP 54-88337 A JP-A-55-67025 JP-A-1-52833

  However, the partially fused false twisted yarn described in the above-mentioned Patent Document 1 has uneven spots because fused portions exhibiting dark color and non-fused portions exhibiting light color exist alternately in the longitudinal direction of the yarn. Although a feeling can be obtained, since a false twisting process with a very large number of false twists is applied after applying thick and thin spots to the yarn, the texture is hard when weaving or knitting the knitted or knitted fabric, and the feeling of fluffiness is lacking There was a drawback.

  Further, the strongly twisted processed yarn described in Patent Document 2 has substantially no bulky portion (crimped portion) due to emphasis on the actual twisted texture. For this reason, the woven or knitted fabric obtained by using the processed yarn has also been a product having a hard texture and lacking a feeling of fluffiness.

  Furthermore, as described above, the real twisted false twisted yarn described in Patent Document 3 gives a feeling of fluffiness to the woven or knitted fabric and also has a real twist part, so that it can be expected to give a sense of elasticity. However, in this Patent Document 3, since false twisting is performed on undrawn yarn, the difference in yarn form between the untwisted portion and the overwound twisted portion in the false twisted yarn becomes significant, and the surface of the woven or knitted fabric is not yet. There was a problem that the untwisted portion was liable to be a defect and the appearance of the product was impaired.

  Furthermore, as described above, the pre-twisted false twisted yarn described in Patent Document 4 can obtain a woven or knitted fabric having an uneven texture, but the false twisted yarn has a real twist portion. Since it does not exist, there is a problem that the knitted or knitted fabric lacks a sense of elasticity and sharpness.

  The present invention has been made in view of the above-mentioned various problems, and its specific purpose is to provide a real twist portion and a bulky body having a twist in the false twisting direction and a twist in the direction opposite to the false twisting direction. And providing a false twisted yarn capable of providing a woven or knitted fabric that expresses an appropriate texture, sharpness, squeaky feeling, and stretchability, and further includes the false twisted yarn. It is providing the manufacturing method which can manufacture a woven / knitted fabric and the false twisted yarn with high productivity.

  In order to achieve the above object, the false twisted yarn provided by the present invention is basically composed of a thermoplastic multifilament yarn, and a first actual twist portion having a twist in the false twist direction, A second real twist portion having a twist in a direction opposite to the false twist twist direction, and a bulky crimp portion having a false twist crimp formed between the real twist portions of the first and second real twist portions. , Wherein the total average twist (t / m) of the first and second real twist parts is 6000 / √T or more and 10,000 / √T or less (where T is The main feature is that it is a total fineness (decitex).

In the false twisted yarn according to the present invention, the length ratio of the first and second real twist portions in the entire false twisted yarn is preferably 80% or more. Furthermore, in JIS L 1013 It is preferable that the tensile elastic modulus based on it is 20% or more.
Moreover, in this invention, the woven / knitted fabric containing the false twisted yarn provided with the said structure is provided.

  Furthermore, the manufacturing method of the false twisted yarn provided by the present invention has, as a basic configuration, entanglement in which the thermoplastic multifilament yarn has an entanglement number of 70 pieces / m or more and an average entanglement length of 2 mm or more and 7 mm or less. And twisting the thermoplastic multifilament yarn with entanglement at a heat set temperature not lower than the false twist fusion temperature of the thermoplastic multifilament yarn and not higher than the false twist fusion temperature. The main feature is to include processing.

In the false twisted yarn according to the present invention, the total average number of actual twists of the first and second real twist portions having a twist in the false twist direction and a twist in the reverse direction of the false twist direction is 6000 / √T to 10000 / √T, preferably 6500 / √T to 8500 / √T. Here, the total average actual twist number of the first and second actual twist parts is calculated from the following formula using the actual twist number and the actual twist part ratio of the first and second actual twist parts.
Average actual twist number = t1 × r1 / 100 + t2 × r2 / 100
In addition, t1 is a real twist number (t / m) in the same direction as the false twist direction, and r1 is a real twist part ratio (%) in the same direction as the false twist direction. Further, t2 is the actual twist number (t / m) in the direction opposite to the false twist direction, and r2 is the actual twist ratio (%) in the direction opposite to the false twist direction. Here, the actual twisted portion ratio refers to the ratio of the measured length of the first or second actual twisted portion to the measured length of the false twisted yarn.

  As a result of intensive studies and examinations by the present inventors, if the average actual twist number calculated by the above formula is a false twisted yarn having a value within the predetermined range, the knitted fabric is knitted. It was revealed that it is possible to obtain a woven or knitted fabric having an appropriate feeling of texture, elasticity and squeakiness, and also excellent stretch properties.

  In addition, the false twisted yarn of the present invention is a knitted or knitted fabric because the ratio of the length direction of the first and second real twisted portions to the entire false twisted yarn is 80% or more, preferably 85% or more. It becomes possible to express a harshness feeling more reliably when obtained. Furthermore, for example, it is possible to prevent the occurrence of problems such as a feeling of flickering due to false twist crimps and deterioration of the quality of the woven or knitted fabric.

  Furthermore, when the tensile elastic modulus of the false twisted yarn based on JIS L 1013 is 20% or more, preferably 25% or more, it is possible to obtain a more appropriate feeling of flaming when the woven or knitted fabric is knitted. .

  And, the woven or knitted fabric of the present invention including the false twisted yarn having the above-described configuration has a moderate graininess, a harshness feeling, and a flaming feeling that cannot be obtained with a conventional false twisted yarn. It becomes a woven or knitted fabric with excellent properties.

  Next, in the method for producing false twisted yarn according to the present invention, first, the thermoplastic multifilament yarn is intermittently entangled using, for example, an air nozzle, and the number of entanglements is 70 / m or more. In addition, confounding having an average confounding length of 2 mm or more and 7 mm or less is provided. Thereby, suitable convergence can be given to multifilament yarn, and sufficient real twist is obtained when the following false twist processing is performed.

  Further, after the entanglement is imparted to the thermoplastic multifilament yarn, false twisting is performed on the thermoplastic multifilament yarn at a heat setting temperature not lower than the false twist fusion temperature (-20 ° C.) and not higher than the false twist fusion temperature. . At this time, the portion of the multifilament yarn that has been entangled has higher convergence than other portions that have not been entangled. Is provided. As a result, the first actual twisted portion is formed by the twist imparted in the untwisting region beyond the number of twists, and the twist in the false twist twist direction remains without being completely untwisted. Moreover, in the other part to which the entanglement is not given, a twist smaller than the set twist number is given, contrary to the part to which the entanglement is given. As a result, in the untwisting region, twisting in the direction opposite to the false twisting direction (untwisting direction) is applied to form the second actual twisted portion, and the first actual twisted portion and the second actual twisted portion. Between the two, a bulky crimped portion is formed in which the twist is unwound and a fine false twist crimp is imparted. Thus, the false twisted yarn according to the present invention can be stably produced by performing false twisting at a predetermined heat set temperature after performing the entanglement process under the predetermined conditions. In addition, the false twist fusion temperature referred to in the present invention refers to a temperature at which fusion occurs in a single fiber when the heat setting temperature is raised.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a schematic view schematically showing an example of false twisted yarn according to the present invention.
The false twisted yarn 10 of the present embodiment shown in FIG. 1 is made of a thermoplastic multifilament yarn, and the first actual twisted portion 1 having a twist in the false twist direction is opposite to the false twist direction. It has the 2nd real twist part 2 which has the twist of a direction, and the bulky crimp part 3 which has a false twist crimp.

  When the first actual twisted portion 1 is false twisted on the multifilament yarn, the first twisted portion 1 is not twisted in the untwisted region by applying a twist equal to or greater than the set number of twists starting from the portion where the entanglement is imparted. The untwisted portion is formed by holding a twisted state in the same direction as the false twisting direction, and is a portion having a converging structure in which single fibers of multifilament yarns are aligned.

  The second actual twisted portion 2 is a portion having a twist in a direction opposite to that of the first actual twisted portion 1 where the multifilament yarns are converged as a whole. This 2nd real twist part 2 also has the part in which the false twist crimp provided by false twist process is mixed.

  The bulky crimped portion 3 is a portion in which the multifilament yarn is not substantially converged and has a false twist crimp in the opened state, and as shown in FIG. 1, the first actual twisted portion 1 and the second actual twisted portion 1 It may be formed between the twisted portions 2 and may also be formed between the actual twisted portions such as between the first actual twisted portions 1 or between the second actual twisted portions 2. The bulky crimped portion 3 includes not only a portion where a false twist crimp is formed by false twisting as described below, but also a portion where a false twist crimp is formed by entanglement processing.

  In the false twisted yarn 10 of this embodiment, the total average actual twist number (t / m) of the first and second actual twisted portions 1 and 2 is 6000 / √T or more and 10000 / √T or less. In particular, the total average actual twist number is preferably 6500 / √T or more and 8500 / √T or less. When the total average actual twist number is less than 6000 / √T, the shape stability of the actual twist structure is deteriorated, and the harshness of the woven or knitted fabric is lowered when the woven or knitted fabric is knitted. On the other hand, if it exceeds 10000 / √T, the actual twisted structure will be stabilized, but there will be many parts that look like defects when obtained with woven or knitted fabric, and the appearance of the product will be impaired, and the feeling of flaming will also be lacking. Such a problem occurs. Therefore, if the total average actual twist number of the first and second actual twisted portions 1 and 2 of the false twisted yarn 10 is within the above range, when the woven or knitted fabric is woven, A firm feeling and a squeaky feeling can be imparted at the same time, and further excellent stretch properties can be provided.

  Moreover, in the false twisted yarn 10 of this embodiment, the ratio of the length direction to the whole false twisted yarn 10 of the 1st and 2nd real twist parts 1 and 2 is 80% or more, Preferably it is 85% or more. . In the case where the ratio in the length direction of the first and second actual twisted portions 1 and 2 is less than 80%, when the woven or knitted fabric is woven or knitted, the harshness of the woven or knitted fabric decreases, and the false twist crimp further occurs. A flickering feeling due to is likely to occur, which may lead to a decrease in product quality. Therefore, if the ratio in the length direction of the first and second actual twisted portions 1 and 2 is 80% or more, and further 85% or more, the occurrence of a fluffy feeling is prevented when a woven or knitted fabric is formed, and the feeling of elasticity is sufficient. Therefore, it is possible to obtain a high-quality product. In consideration of the appearance and texture of the woven or knitted fabric, the ratio in the length direction of the first and second actual twisted portions 1 and 2 is preferably 95% or less.

  Furthermore, the false twisted yarn 10 of the present embodiment has a tensile elastic modulus based on JIS L 1013 of 20% or more, preferably 25% or more. When the tensile elastic modulus is less than 20%, almost no flaming feeling can be obtained when the knitted or knitted fabric is woven or knitted. However, if the elastic modulus is 20% or more, more preferably 25% or more, it is appropriate. It is possible to impart a soft feeling to the woven or knitted fabric. In consideration of imparting an appropriate flaky feeling to the woven or knitted fabric, the tensile elastic modulus is preferably 40% or less.

  In the present invention, the material of the thermoplastic multifilament yarn constituting the false twisted yarn 10 is not particularly limited, and general thermoplastic fibers such as polyester fiber, polyacrylonitrile fiber, polyamide fiber, and acetate fiber are used. It is possible. Moreover, the cross-sectional shape, total fineness, fineness unevenness, dyeing characteristics, etc. of individual constituent filaments are not particularly limited, and can be arbitrarily set according to the purpose and the like. Furthermore, it is possible to include various additives as required.

  In addition, although the false twisted yarn 10 of the present embodiment has been described with respect to a case where the false twisted yarn 10 is composed of one thermoplastic multifilament yarn, the present invention is not limited to this, and two or more thermoplastic multifilament yarns are used. You may be comprised from the filament yarn. When the false twisted yarn of the present invention is composed of two or more multifilament yarns, for example, a combination of multifilament yarns of the same material such as polyester fibers, or materials such as polyester fibers and acetate fibers are different. A false twisted yarn can be constituted by a combination of multifilament yarns. In particular, when the false twisted yarn of the present invention is composed of a plurality of multifilament yarns of different materials, the texture and product appearance of the woven or knitted fabric can be variously changed according to the material and composition ratio of the fibers used. Application to various products can be expected.

  And the woven or knitted fabric obtained using the false twisted yarn 10 of the present embodiment as described above has a moderate texture, harshness, and fluffy feel that could not be obtained with a conventional false twisted yarn, A woven or knitted fabric with excellent stretchability. In the woven or knitted fabric including the false twisted yarn 10, the mixing ratio of the false twisted yarn and the woven or knitted fabric can be arbitrarily selected within a range in which a desired texture and product appearance can be obtained. For example, the false twisted yarn 10 can be used alone to form a woven or knitted fabric, or the false twisted yarn 10 can be used as a part of the woven or knitted fabric to form a knitted or woven fabric.

  In the present invention, the knitted or knitted fabric may be knitted using a twisted yarn including the false twisted yarn 10. As the twisted yarn, a twisted yarn of the false twisted yarn 10, a twisted yarn of the false twisted yarns 10 or a twisted yarn of the false twisted yarn 10 and another fiber, or the like is used. Can do. For example, by twisting the false twisted yarn 10 and other fibers, it is possible to obtain a woven or knitted fabric having not only the features of the false twisted yarn 10 but also the features of other fibers. As a specific example, the false twisted yarn 10 and other fibers such as natural fibers and regenerated fibers are twisted together, so that the characteristics of the false twisted yarn 10 such as a feeling of warping and a feeling of harshness are obtained. In addition, it is possible to give the woven or knitted fabric a characteristic that the other fiber originally has, for example, a texture such as a glossy feeling, a refreshing feeling, a sharp feeling, and a wet feeling. In addition, it is possible to obtain a woven or knitted fabric rich in a sense of elasticity due to the twisting effect of the twisting.

  In addition, as other fibers used for the above-mentioned twisting, for example, natural fibers such as cotton, hemp, and silk, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, or thermoplastic fibers such as polyester fibers are used. be able to. In addition, the cross-sectional shape of the single fiber constituting each fiber is not particularly limited, and the cross-sectional shape of the yarn such as chrysanthemum, circular, flat, Y-shaped is taken into consideration in consideration of the texture and gloss of the resulting woven or knitted fabric Should be selected. Further, the single fiber fineness and dyeing characteristics of the other fibers are not particularly limited. Further, in this case, the twist direction and the number of twists of the twisted yarn are not particularly limited, and the number of constituent yarns, the mixing ratio of the false twisted yarn 10, the number of twists, etc., have the desired texture and the appearance of the woven or knitted fabric. What is necessary is just to set suitably in the range obtained.

Next, an example of a method for manufacturing the false twisted yarn 10 of the present embodiment described above will be described with reference to FIG. Here, FIG. 2 is a schematic view schematically showing a configuration of an apparatus for producing the false twisted yarn of the present invention.
The manufacturing apparatus 11 shown in FIG. 2 first uses a stretched thermoplastic multifilament yarn constituting the false twisted yarn 10 as a supply yarn 12 and supplies it to the entangled air nozzle 14 via a first yarn supply roller 13. Supply at an overfeed rate of. The entangled air nozzle 14 intermittently entangles thermoplastic multifilament yarns that are continuously supplied to entangle the number of entanglements of 70 pcs / m or more and an average entanglement length of 2 mm to 7 mm. Give.

  In the entanglement process by the entanglement air nozzle 14, when the number of entanglement to be applied to the multifilament yarn is less than 70 / m, the convergence property between the fibers is low, and the false twist process obtained after the false twist process is performed. As a result of the average number of actual twists of the yarn being less than 6000 / √T, which is the lower limit of the above-mentioned range, an appropriate harsh feeling cannot be obtained in the woven or knitted fabric, and the wrinkled feeling is also lowered.

  Moreover, in the said entanglement process, when the average entanglement length of the entanglement given to a multifilament yarn is less than 2 mm, a 1st actual twist part and a 2nd actual twist part are formed stably when performing a false twist process after that It becomes difficult to do. On the other hand, if the average entanglement length exceeds 7 mm, the first actual twisted portion and the second actual twisted portion cannot be appropriately formed, and the false twisted yarn 10 cannot be obtained. For this reason, the multifilament yarn needs to be entangled with an average entanglement length of 2 mm or more and 7 mm or less, whereby the first actual twisted portion and the second actual twisted portion are appropriately formed by the following false twisting process. As a result, it is possible to obtain a woven or knitted fabric having an excellent feeling of crease and harshness.

  The multifilament yarn subjected to the entanglement process under the predetermined condition by the entanglement air nozzle 14 is then subjected to false twisting between the second yarn supply roller 15 and the first take-up roller 18. A first heater (contact heater) 16 and a false twist spindle 17 are arranged between the second yarn supply roller 15 and the first take-up roller 18.

  When the multifilament yarn supplied to the false twisting region at a predetermined overfeed rate via the second yarn supply roller 15 is rotated in a predetermined direction by the false twist spindle 17, the second yarn supply roller 15 and false twisting spindle 17 (that is, twisting region), the twist in the false twisting direction is applied, and the first heater 16 causes the thermoplastic multifilament yarn to have a (false twist fusion temperature of −20 ° C. ) The heat treatment is performed at a temperature not higher than the false twist fusion temperature.

  Subsequently, the multifilament yarn passes through the false twist spindle 17 and twists in the direction opposite to the false twist direction between the false twist spindle 17 and the first take-up roller 18 (that is, the untwisting region). Is applied to receive untwisting action. As a result of this series of operations, the multifilament yarn is heat-set in a state where the entanglement is higher than the other portions and the twist of the set number of twists or more is applied starting from the entanglement portion. At the same time, it becomes an untwisted portion in the untwisted region and becomes the first actual twisted portion 1 of the false twisted yarn. In addition, since the first actual twisted portion becomes an untwisted portion, in other portions, the bulky crimped portion 3 having a false twist crimped by untwisting in the false twist twist direction and the number of twists or more A second actual twisted portion 2 is formed which is subjected to a twisting operation in the direction opposite to the false twisting direction after receiving the untwisting action.

  Thus, by performing false twisting at a predetermined heat set temperature for the multifilament yarn to which the predetermined number of entanglements and the average entanglement length are entangled, the first and second actual twist portions 1 and 2 The false twisted yarn 10 in which the total average actual twist number is a value within the predetermined range as described above, and the ratio in the length direction of the first and second actual twist portions 1 and 2 is 80% or more. Obtainable.

  Furthermore, in the manufacturing apparatus 11 shown in FIG. 2, a second heater that performs a relaxation heat setting process on the multifilament yarn (false twisted yarn) that has been subjected to the false twisting process after the first take-up roller 18 ( A non-contact heater) 19 is arranged. By performing the relaxation heat setting process on the false twisted yarn with the second heater 19, it is possible to reduce the apparent torque of the false twisted yarn. The second heater 19 can be omitted, and whether or not the second heater is installed can be selected according to the purpose or the like.

  Thereafter, the false twisted yarn subjected to the heat setting process by the second heater 19 is taken up by the take-up unit 21 via the second take-up roller 20. By passing through the above processes, the false twisted yarn 10 according to the present invention can be manufactured stably. In the manufacturing apparatus 11 shown in FIG. 2, the entanglement process performed by the entanglement air nozzle 14, the false twisting performed between the second yarn supply roller 15 and the first take-up roller 18, and the second heater 19. Although the relaxation heat setting process is continuously performed to produce the false twisted yarn 10 efficiently, the present invention is not limited to this, and the respective processes and processes are divided for each process, You may implement each process separately.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In addition, the measurement and evaluation of the physical property in each false twisted yarn obtained by the Example and the comparative example were performed using the following method.
(1) Measuring method of the average number of actual twists An initial load of 3.6 × 10 ⁻³ g / dtex was applied to a 1 m yarn and wound on a mount, and each actual value was measured with a microscope (manufactured by KEYENCE Inc.). Ten twist angles of the twisted part were measured, and the average value was calculated to determine the actual number of twists. In addition, the average actual twist number was calculated from the following formula using the obtained actual twist number and the actual twist part ratio described later.
Average actual twist number = t1 × r1 / 100 + t2 × r2 / 100
In the above formula, t1 is the actual number of twists (t / m) of the first real twist part having the same twist as the false twist direction, and t2 is the second real twist part having the twist opposite to the false twist direction. The actual number of twists (t / m), r1 represents the actual twisted portion ratio (%) of the first actual twisted portion, and r2 represents the actual twisted portion ratio (%) of the second actual twisted portion.
(2) Measuring method of actual twist ratio The initial load of 3.6 × 10 ⁻³ g / dtex was applied to a 1 m yarn, wound on a mount, and first measured with a microscope (manufactured by KEYENCE Inc.). And the length of the 2nd real twist part and the length of the bulky crimp part were measured, and the ratio of the length of each real twist part to the total measurement length of false twisted yarn was computed.
(3) Method for measuring crimp characteristics Based on JIS L 1013, the tensile elastic modulus of each false twisted yarn was measured as the crimp characteristics.
(4) Texture evaluation method of woven or knitted fabric False twisted yarn or twisted yarn was knitted and woven, and the texture of the woven or knitted fabric was evaluated by handling and visual judgment.
(5) False twisting temperature The false twist overfeed rate is 2%, the processing speed is 100 m / min, the false twist is 3000 T / m, the false twist temperature is raised, and the temperature at which the single fiber is fused is temporarily set. The twist fusion temperature was used.

Example 1
Using a device in which the second heater 19 and the second take-up roller 20 are omitted from the production device 11 shown in FIG. 2, false twisted yarn was produced as follows.
Polyester multifilament drawn yarn (84 dtex / 36 filament) is supplied to the entangled air nozzle 14 through the first yarn supply roller 13 as the supply yarn 12, and the air pressure is 0.5 MPa, the overfeed rate (hereinafter abbreviated as OF). ) Confounding was given at 4%. The number of entanglements of the multifilament yarn after the entanglement treatment was 81 pcs / m, and the average entanglement length was 4.1 mm. The false twist fusion temperature was 243 ° C.

  Subsequently, the entangled multifilament yarn is supplied to the false twisting region via the second yarn supply roller 15, the processing speed is 200 m / min, and the false twist overfeed rate (hereinafter abbreviated as false twist OF) 1% False twisting was performed under the conditions of a false twist temperature of 237 ° C. (the heat setting temperature of the first heater 16) and a false twist number of 2850 t / m (Z twist). Then, the false twisted yarn of Example 1 was obtained by winding the false twisted yarn subjected to false twisting at the winding portion 21 via the first take-up roller 18.

  With respect to the false twisted yarn obtained in Example 1, the average number of actual twists, the ratio of actual twisted portions, and crimp characteristics were measured in accordance with the measurement methods described above. The measurement results are shown in Table 1 below. Further, a woven fabric (warp density of 10.56 wings / cm, weft density of 120 yarns / 2.54 cm, satin structure) was woven using the false twisted yarn of Example 1, and the dyeing temperature was 130 after refining by a conventional method. It dye | stained with the disperse dye on the conditions for 30 degreeC and dyeing | staining time. When the texture of the obtained woven fabric was evaluated, it was a woven fabric having a moderate sensation of texture and a harshness and also having a squeaky feeling.

(Example 2)
Polyester multifilament drawn yarn (56 dtex / 24 filament) was used as the supply yarn 12 and supplied to the entangled air nozzle 14 through the first yarn supply roller 13 to give entanglement at an air pressure of 0.35 MPa and an OF rate of 4%. . The number of entanglements of the multifilament yarn after the entanglement treatment was 74 pcs / m, and the average entanglement length was 4.4 mm. The false twist fusion temperature was 245 ° C.

  Subsequently, the entangled multifilament yarn is supplied to the false twisting region via the second yarn supply roller 15, the processing speed is 140 m / min, the false twist OF is 2%, the false twisting temperature is 240 ° C. (of the first heater 16 Heat set temperature) and false twisting were performed under the conditions of 3800 t / m false twist (Z twist). Then, the false twisted yarn of Example 2 was obtained by winding the false twisted yarn subjected to false twisting at the winding portion 21 via the first take-up roller 18.

  With respect to the false twisted yarn of Example 2 obtained, the average number of actual twists, the ratio of actual twisted portions, and crimp characteristics were measured according to the above-described measurement methods. The measurement results are shown in Table 1 below. Furthermore, using the obtained false twisted yarn of Example 2 and a triacetate multifilament yarn (84 dtex / 20 filament), a twisted yarn was produced at a twisting number of 800 t / m (Z twist direction). Using the obtained twisted yarn, a woven fabric (warp density of 10.56 wings / cm, weft density of 125 yarns / 2.54 cm, satin structure) was woven and subjected to high-pressure disperse dyeing after scouring by a conventional method. When the texture of the obtained woven fabric was evaluated, it was a woven fabric having an appropriate crease feeling, a harsh feeling, a flaming feeling, and excellent in stretchability.

(Comparative Example 1)
Polyester multifilament drawn yarn (84 dtex / 36 filament) was supplied as a supply yarn 12 to a entangled air nozzle 14 via a first yarn supply roller 13, and entangled at an air pressure of 0.3 MPa and OF 2%. The number of entanglements of the multifilament yarn after the entanglement treatment was 51 / m, and the average entanglement length was 4.3 mm. The false twist fusion temperature was 243 ° C.

  Subsequently, the entangled multifilament yarn is supplied to the false twisting region via the second yarn supply roller 15, the processing speed is 200 m / min, the false twist OF is 2%, the false twist temperature is 237 ° C. (of the first heater 16 Heat set temperature) and false twisting were performed under the conditions of false twist number 2800 t / m (Z twist). Then, the false twisted yarn of Comparative Example 1 was obtained by winding the false twisted yarn subjected to false twisting at the winding portion 21 via the first take-up roller 18.

  With respect to the false twisted yarn of Comparative Example 1 obtained, the average number of actual twists, the actual twist ratio, and the crimp characteristics were measured according to each of the measurement methods. The measurement results are shown in Table 1 below. Further, using the false twisted yarn of Comparative Example 1 obtained, a woven fabric was woven under the same conditions as in Example 1, and dyeing was performed under the same conditions as in Example 1 after scouring by a conventional method. When the texture of the obtained woven fabric was evaluated, it was found that the woven fabric was low in quality because of its low actual twist number, so that it was less crisp and harsh and had a squeaky feeling but a squeaky feeling.

It is a mimetic diagram showing typically an example of false twisted yarn concerning the present invention. It is the schematic which shows roughly the structure of the apparatus which manufactures the false twisted yarn of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st real twist part 2 2nd real twist part 3 Bulky crimp part 10 False twist process yarn 11 Manufacturing apparatus of false twist process thread 12 Supply thread 13 1st thread supply roller 14 Interlaced air nozzle 15 2nd thread supply roller 16 First heater 17 False twisting spindle 18 First take-up roller 19 Second heater 20 Second take-up roller 21 Winding portion

Claims (5)

Made of thermoplastic multifilament yarn,
A first real twist portion having a twist in the false twist direction, a second real twist portion having a twist in a direction opposite to the false twist direction, and a real twist portion of the first and second real twist portions. A bulky crimped part formed between, and a bulky crimped part having false twisted crimps,
An average real twist number (t / m) of the first and second real twist portions is 6000 / √T or more and 10000 / √T or less (where T is a total fineness (decitex)). False twisted yarn.   The false twisted yarn according to claim 1, wherein a ratio of a length direction of the first and second real twist portions to the entire false twisted yarn is 80% or more.   The false twisted yarn according to claim 1 or 2, wherein the tensile elastic modulus based on JIS L 1013 is 20% or more.   A woven or knitted fabric comprising the false twisted yarn according to any one of claims 1 to 3. Providing the thermoplastic multifilament yarn with an entanglement number of 70 / m or more and an average entanglement length of 2 mm or more and 7 mm or less; and
Performing false twisting on the thermoplastic multifilament yarn provided with entanglement at a heat setting temperature not lower than the false twist fusion temperature of the thermoplastic multifilament yarn (false twist fusion temperature −20 ° C.),
A process for producing false twisted yarn, comprising:

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