JP4617578B2 - Composite temporary twisted yarn and method for producing the same - Google Patents

Description

【００５６】
【発明の効果】
以上述べたとおり、本発明の複合仮ヨリ加工糸は、高いストレッチ性を示し、かつ嵩高性とソフトでスパンライクな風合いを併せもち、かつ良好なストレッチバック性を有する複合仮ヨリ加工糸である。
【００５７】
従来の複合仮ヨリ加工糸は、芯糸が鞘糸に拘束され、ストレッチ性が低くなるが、本発明の複合仮ヨリ加工糸では、芯糸となるフィラメントＡが鞘糸となるフィラメントＢより先にストレッチ発現するので、ストレッチ性に富む複合加工糸になる。
【００５８】
さらに、第２ヒーターで弛緩熱処理することにより、仮ヨリ加工糸特有のフカつき感は少なく、織編物にしたときにソフトな風合いになる。また、表面の凸凹が小さくなることから表面品位にも優れた織編物を得ることができる。
【００５９】
また、本発明の複合仮ヨリ加工糸を用いた編織物を染色すると、カスリ調色差を有するスパンライクな編織物得ることができる。ポリエチレンテレフタレート等のポリエステルより濃く染まるポリトリメチレンテレフタレートからなる糸の周囲を、ポリエチレンテレフタレート等のポリエステルからなる糸で取り囲むことによって、色差がぼやけた自然感覚なカスリ調染色差を得ることができる。
【００６０】
また、本発明の複合仮ヨリ加工糸は、良好な伸長回復率を示すため、織編物にすると良好なストレッチバック性を得ることができ、特にスポーツ衣料などで、織編物がストレッチに十分に追従し、肘、膝部分のワライの発生を抑えることができる。
【００６１】
また、本発明の複合仮ヨリ加工糸は、嵩高性に優れているため、ふくらみがあり、なおかつ軽量性と保温性に優れた織編物となる。
【００６２】
本発明の複合仮ヨリ加工糸からなる布帛は、衣料用として、特にジャケット、ボトムなどのアウター、ワンピース、スカート、アームウォーマーなどの婦人衣料、ジャージ、アスレチックウェア、スキーウェアなどのスポーツ衣料などストレッチ素材として用いることができる。
【図面の簡単な説明】
【図１】本発明の複合仮ヨリ加工糸を製造する工程の一例を示す概略図である。
【図２】本発明の複合仮ヨリ加工糸の一例を示すもので、（Ａ）は糸全体の側面を示し、（Ｂ）は上記（Ａ）における１Ｂ−１Ｂ’断面図を、（Ｃ）は同じく上記（Ａ）における１Ｃ−１Ｃ’断面図を、それぞれ示す。
。
【符号の説明】
１Ａ：フィラメントＡ（ポリトリメチレンテレフタレート未延伸糸パッケージ）
１Ｂ：フィラメントＢ（ポリエステル未延伸糸パッケージ
２：フィードローラ
３：第１ヒータ
４：冷却板
５：仮ヨリ具
６：デリベリーローラ
７：第２ヒーター
８：フィードローラ
９：交絡ノズル
１０：フィードローラ
１１：テイクアップローラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite temporary twisted yarn having high stretchability, bulkiness, soft and spun-like texture, and having good surface quality and stretchback property, and a method for producing the same.
[0002]
[Prior art]
Conventionally, for example, as proposed in Japanese Patent Application Laid-Open No. 7-118976, a polyester fiber having polyethylene terephthalate as a main polymer component can be temporarily twisted with a temporary twisting machine having a one-stage heater. Composite temporary twisted yarn has a very large shrinkage, so the yarn itself is rich in bulky properties. There was a problem of lack of soft texture when it became.
[0003]
Therefore, a two-stage heater intended to reduce the hot water shrinkage rate and shrinkage by reducing the hot water shrinkage rate by continuously performing the thermal relaxation treatment with the heater again. Temporary twisting is performed with the temporary twisting machine, but there is a problem that the original high stretchability is lost too much to reduce the shrinkage. Further, since the hardness of the polyethylene terephthalate polyester fiber itself is not reduced, the soft texture is not improved so much.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a composite temporary twisted yarn having both high stretchability, bulkiness, soft and spun-like texture, and good surface quality and stretchback properties.BisoIt is in providing the manufacturing method of.
[0005]
[Means for Solving the Problems]
The present invention aims to achieve the above object, and the composite temporary twisted yarn of the present invention comprises a filament A made of polytrimethylene terephthalate,Elongation greater than filament AFilament B made of polyesterAfter applying the temporary twist at the same time, perform relaxation heat treatmentA composite temporary twisted yarn comprising entangled composite yarns and satisfying the following yarn physical properties.
-Residual torque number is 75 (T / m) or less
20 ≦ Ken contraction temperature difference (CRT (B) −CRT (A)) (° C.) ≦ 40 (where CRT: temperature (° C.) reaching 80% expression of stretch recovery rate under load).
In addition, the method for producing the composite temporary twisted yarn of the present invention is such that both the filament A made of polytrimethylene terephthalate and the filament B made of polyester having a higher elongation than the filament A are aligned and simultaneously subjected to temporary twist. After that, a relaxation heat treatment is performed to entangle the composite temporary twisted yarn.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The composite temporary twisted yarn of the present invention is basically composed of a composite yarn in which a filament A made of polytrimethylene terephthalate and a filament B made of polyester are entangled.
[0007]
For the filament A of the present invention, a yarn made of polytrimethylene terephthalate is used. Polytrimethylene terephthalate is a polyester obtained by using terephthalic acid as a main acidic component and using 1,3 propanediol as a main glycol component. Further, that the yarn is made of polytrimethylene terephthalate means that the polymer component constituting the fiber has trimethylene terephthalate as a main repeating unit.
[0008]
Since a yarn made of polytrimethylene terephthalate has low bending rigidity, a soft texture can be obtained when a fabric is produced using the composite temporary twisted yarn of the present invention. Moreover, since the yarn made of polytrimethylene terephthalate is excellent in elasticity recovery property, a knitted fabric excellent in stretch back property can be obtained.
[0009]
As the elastic recoverability of the filament A made of polytrimethylene terephthalate used in the present invention, it is preferable that the elongation recovery rate at 20% elongation is 60% or more. In order to obtain a woven or knitted fabric excellent in wearing comfort in which the expansion and contraction of the woven or knitted fabric easily follows the movement of each part of the body, it is preferable that the elastic recovery is large, but conversely to 99.5% or more This is not preferable because the feeling of tightening is too strong.
[0010]
The polytrimethylene terephthalate may contain other copolymer components capable of forming other ester bonds in a range not losing the effect of the present invention, preferably 20 mol% or less, more preferably 10 mol% or less. As the copolymerizable compound, examples of the acid component include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid. As the glycol component, Examples thereof include ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, cyclohexane dimethanol, polyethylene glycol, and polypropylene glycol. Further, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments and the like as antioxidants can be added as necessary.
[0011]
The intrinsic viscosity of the polytrimethylene terephthalate used in the present invention is preferably 0.5 or more and 1.2 or less. By setting it to 0.5 or more, stable spinning becomes possible and yarn breakage does not occur. Further, unevenness in fineness can be suppressed, and a yarn excellent in tensile strength and bending wear resistance can be obtained. In addition, when the intrinsic viscosity is 1.2 or less, stable spinning can be performed and the texture of the fiber can be softened. The intrinsic viscosity is more preferably 0.8 or more and 1.0 or less.
[0012]
On the other hand, a filament made of polyester is used for the filament B of the present invention. The yarn made of polyester is preferably a filament yarn whose main component is one of polyethylene terephthalate, polymethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate. From the viewpoint of iron resistance, polyethylene It is preferable to use a filament yarn made of terephthalate.
[0013]
The composite temporary twisted yarn obtained in the present invention can be used as a knitted or knitted fabric by adopting polyester and polytrimethylene terephthalate having a Kemp shrinkage temperature difference represented by the following formula for filament A and filament B: A composite temporary twisted yarn imparting high stretchability can be obtained.
20 ≦ Ken contraction temperature difference (CRT (B) −CRT (A)) (° C.) ≦ 40
Here, the Ken-shrinking expression temperature is a temperature that has finally been developed to a value of 80% of the stretch recovery rate (SR) under load at 90 ° C. Here, the crimp shrinkage expression temperature of the filament A is denoted as CRT (A), and the crimp shrinkage expression temperature of the filament B is denoted as CRT (B). By examining the above temperature, it is shown at which temperature the crimp is developed.
[0014]
Usually, CRT takes a value approximately close to the glass transition temperature of the polymer. The glass transition temperature of PET is in the range of 70 to 80 ° C, and polytrimethylene terephthalate is in the range of 30 to 40 ° C. However, the polytrimethylene terephthalate used for the filament B develops crimping to nearly 30% even at room temperature, and reaches CRT (A) at 40 ° C. This difference in CRT has a great influence on the stretch.
[0015]
When a woven fabric made of a composite temporary twisted yarn satisfying the above formula has a Ken-shrinking temperature difference, heat treatment is performed on the filament A before the filament B. At this time, the filament A is squeezed and expressed in a form wrapped by the filament B. That is, the filament A can express the crimp without being inhibited by the filament B that has been crimped or the fabric restraint, and as a result, a high stretch fabric in which the core filament made of the filament A has a large crimp has been obtained. be able to.
[0016]
In the case of ordinary polyester yarns, the CRT of the core sheath is almost the same, that is, the crimp shrinkage temperature difference is less than 20 (° C.). Will be expressed. Then, the single filament of the core filament is caught by the sheath filament that has been crimped, and the core filament cannot be freely crimped. As a result, a high stretch fabric cannot be obtained. Further, if the crimp shrinkage temperature difference is larger than 40, the crimp shrinkage of the core filament is strong, and the sheath filament is loosened, which causes thread breakage.
[0017]
The single yarn cross-sectional shape of the filament A of the present invention and the filament B is not particularly limited, and is a circular shape, a triangular shape, a flat shape, a hexagonal shape, and the like, and the total fineness of the composite temporary twisted yarn of the present invention is What is necessary is just to select suitably according to a use purpose in the range of 30 Dtex to 1000 Dtex. In order to obtain a soft touch, the single fiber fineness of the sheath yarn is preferably 3 dtex or less, more preferably 0.5 to 1.5 dtex. The single fiber fineness of the core yarn is preferably 1 dtex or more, more preferably 1.5 to 8 dtex in order to give the fabric a firmness and stiffness.
[0018]
Next, a temporary twisting method using the filament A and the filament B will be described. In the method for producing a composite temporary twisted yarn of the present invention, both the filament A made of polytrimethylene terephthalate and the sheath filament B made of polyester having a higher elongation than the filament A are aligned to perform temporary twist simultaneously. After that, relaxation heat treatment is performed, followed by entanglement.
[0019]
By temporarily twisting two or more types of filaments having a difference in elongation, the filament on the high elongation side is selectively drawn in the provisional twisting process, and there is a difference in yarn length between the filament on the low elongation side. Thus, a composite temporary twisted yarn can be obtained in which the core yarn is the one with the low elongation side and the sheath yarn is the one with the high elongation side.
[0020]
As the difference in elongation, it is preferable to satisfy the following formula.
・ 1 ≦ Elongation on the high elongation side (%) − Elongation on the low elongation side (%) ≦ 50
・ 100 ≦ High elongation side elongation (%) ≦ 250
・ 50 ≦ Low elongation (%) ≦ 200
For the filament A and filament B in the present invention, either a highly oriented undrawn yarn or a drawn yarn may be used.
[0021]
FIG. 1 is a schematic view showing an example of the production process of the composite temporary twisted yarn of the present invention. In FIG. 1, the filaments 1 </ b> A and 1 </ b> B are aligned in front of the feed roller 2, introduced into the first heater 3 while being temporarily twisted by a twisted body (temporary twisting tool) 5, and heat-set, and cooled by the cooling plate 4. The Thereafter, the heat treatment is performed by the second heater 7 through the delivery roller 6, entangled by the entanglement nozzle 9 through the feed roller 8, and wound around the take-up roller 11 through the feed roller 10.
[0022]
FIG. 2 illustrates the composite false twisted yarn of the present invention, where (A) shows the side surface of the entire yarn, (B) shows the 1B-1B ′ cross-sectional view in (A), and (C) shows Similarly, the 1C-1C ′ cross-sectional view in (A) is shown.
[0023]
The filament A on the low elongation side in the present invention is a filament yarn made of polytrimethylene terephthalate, and is rich in stretch properties. Therefore, the filament A is stretched back immediately before the second heater. Therefore, since the shrinkage is reduced by being wrapped in the filament B on the low elongation side and then entangled, as shown in FIGS. 2 (A), (B) and (C), the periphery of the filament A is The filament B is fixed so as to surround it.
[0024]
The cross section 1B-1B 'in FIG. 2B is the entangled spread portion Y0, and the cross section 1C-1C' in FIG. 2C is the entangled coupling portion YS. A core-sheath structure in which the filament B surrounds the filament A is obtained. In the composite temporary twisted yarn of the present invention, the joint portions YS are present at a frequency of 20 to 250 pieces / m in the longitudinal direction of the yarn in such a state that the spread portions Y0 and the joint portions YS are alternately formed. It is preferable.
[0025]
The yarn length difference of the composite temporary twisted yarn of the present invention is preferably 1% or more and less than 50%. When the difference in yarn length is less than 1%, the core yarn does not sufficiently develop crimping, so that it becomes a processed yarn having poor stretchability. On the other hand, when the yarn length difference is 50% or more, nep is generated and yarn breakage is likely to occur.
[0026]
As the twisted body 5 used for temporary twisting, a pin, friction, a belt nip, or the like can be used.
[0027]
The first heater 3 may be either a contact heater or a non-contact heater, but the second heater 7 is preferably a non-contact heater in order to avoid heat set spots. In the case of a contact heater, in the industrial yarn speed range, the heater temperature and the yarn temperature immediately after the heater exit are substantially equal. In the case of a non-contact type heater, the heater temperature needs to be set higher than the necessary yarn temperature, and an optimal heater temperature may be set according to the yarn speed. The yarn temperature immediately after the exit of the first heater 3 is preferably in the range of 100 ° C. to 200 ° C., more preferably 120 ° C. to 180 ° C., and particularly preferably 130 ° C. to 170 ° C. When the yarn temperature immediately after the exit of the first heater 3 is lower than 100 ° C., the crimp is not sufficiently imparted and the bulkiness is inferior. If the yarn temperature immediately after the exit of the first heater 3 is higher than 200 ° C., the processability is remarkably lowered, fiber fusion and untwisting are likely to occur, and the strength is not preferable. .
[0028]
The temperature of the second heater 7 that performs the relaxation heat treatment is preferably 100 ° C. or higher and 180 ° C. or lower, more preferably within the range of −30 ° C. or higher and + 0 ° C. or lower with respect to the yarn temperature immediately after the exit of the first heater 3. Is preferred. If the temperature of the second heater 7 is too low, the heat setting is not sufficient, and the feeling of creaking and wiping is not sufficiently diminished, so the soft texture is lacking, and the crimped form remains rough. If the temperature of the second heater 7 is too high, temporary twist shrinkage disappears.
[0029]
In order to perform the relaxation heat treatment, the feed rate in the second heater 7 composed of the delivery roller 6 and the feed roller 8 is preferably + 5% or more and + 25% or less. If the feed rate is less than + 5%, it is not possible to sufficiently reduce the feeling of craving and wiping, and if the feed rate exceeds + 25%, it is preferable because the running state of the yarn becomes unstable and heat set spots occur. Absent.
[0030]
The twisted yarn is then entangled using the entanglement nozzle 9 and then taken up by the take-up roller 11.
[0031]
Further, in the composite temporary twisted yarn of the present invention, pre-entanglement may be performed before the false twist zone.
[0032]
The composite temporary twisted yarn of the present invention is preferably composed of a composite yarn in which a filament A made of polytrimethylene terephthalate and a filament B made of polyester are entangled and satisfy the following yarn physical properties at the same time.
・ 10 ≦ Stretch recovery rate under load (SR) (%) ≦ 40
・ 40 ≦ Stretch recovery rate under side load (YR) (%) ≦ 80
A stretch recovery rate (CR) for performing no-load heat treatment is often used for measuring the shrinkage of a conventional temporary twisted yarn. In this measurement method, the degree of crimping in the temporary twisted yarn stage is shown, but the degree of crimping in the state of the fabric such as a woven fabric is not shown. The actual woven fabric is heat-treated in a state where the yarn is tensioned by restraint under the woven structure. In order to obtain a high stretch, it is necessary to manifest a lot of shrinkage during the heat treatment. The amount of crimp that develops under load is determined by the stress that develops crimp, and in the stretch recovery rate under load (SR), in order to assume the stress that develops crimp, the crimp that has been heat-treated under load It is a measurement method. For the heat treatment load of the present invention, 4 mg / dtex, which seems to be almost equal to the plain weave constraint, was used. If the stretch recovery rate under load (SR) is less than 10%, no stretch will appear on the fabric, no matter how high the crimped yarn is. On the other hand, if it exceeds 40%, the shrinkage is so strong that it becomes a woven fabric with wrinkles.
[0033]
In addition, the composite temporary twisted yarn of the present invention preferably has a side load under stretch recovery rate (YR) of 40% or more and less than 80%. Usually, when the high-ken crimped yarn is made into a woven or knitted fabric, a feeling of roughness or fluffiness remains on the surface. This is because the high crimped yarn has large unevenness on the fabric surface due to its strong and rough crimping. In the method of measuring the stretch recovery rate (YR) under the side load, the crimp is expressed under the side pressure of the tube, so that the rough crimp is restrained by the side pressure and is difficult to be expressed. In other words, when the stretch recovery rate under side load (YR) is less than 40%, the stencil is rough, and even if the degree of squeezing is large, the texture and fluffiness remain, and the knitted or knitted fabric lacks softness. Become. Further, if the stretch recovery rate (YR) under side load exceeds 80%, the shrinkage is too strong, and a woven fabric with a grain is formed.
[0034]
Moreover, the composite temporary twisted yarn of the present invention has a residual torque number of 0 or more and 75.(T / m)IsTheAs the residual torque number increases, the crimped shape also becomes rough, so that the skew of the fabric when it is made into a knitted fabric or woven fabric increases, the surface irregularities become large, and the surface quality may be lowered. Is preferably less than 75 (T / m).
[0035]
Furthermore, the elongation recovery rate of the composite temporary twisted yarn of the present invention is preferably 80% or more and 99.5% or less. If the elongation recovery rate is 80% or more, good stretch back property can be obtained when weaving or knitting, and it is suitable as a stretch material. When the elongation recovery rate is 99.5% or more, the feeling of tightening is increased when the woven fabric is used, which is not preferable.
[0036]
The Young's modulus of the composite temporary twisted yarn of the present invention is preferably 15 cN / dtex or more and 25 cN / dtex or less. The Young's modulus of the processed yarn can be controlled by, for example, the type of raw yarn, the filament configuration, provisional twisting conditions, additional twisting conditions, etc., and is the main factor that determines the texture such as bending softness when forming a knitted fabric. Become. By setting the Young's modulus to 25 cN / dtex or less, the texture becomes soft, and by setting the Young's modulus to 15 cN / dtex or more, it is possible to maintain elasticity and rebound.
[0037]
Further, when a knitted fabric using the composite temporary twisted yarn of the present invention is dyed, a spun-like knitted fabric having a toned color difference can be obtained. By surrounding the yarn made of polytrimethylene terephthalate, which is dyed darker than polyethylene terephthalate, with yarn made of polyester such as polyethylene terephthalate, it is possible to obtain a natural sensation-like dyeing difference in which the color difference is blurred.
[0038]
An actual twist is put into the composite temporary twisted yarn of the present invention to make a woven or knitted fabric, and then the weight is reduced by an alkali treatment or the like to obtain an appropriate elasticity.
[0039]
The stretch recovery rate under load (SR) and the stretch recovery rate under side load (YR) in the present invention are evaluated by the following methods. In addition, the details of residual torque number, elongation recovery rate, Young's modulus, and fabric stretch measurement method are also shown. In the present invention, the total filament decitex is indicated as Dtex, and the filament single yarn decitex is indicated as dtex.
[0040]
(1) Stretch recovery rate under load (SR)
The sample is wound 10 times on a measuring machine with a circumference of 0.8 m under a tension of 90 mg / dtex, then suspended on a rod of 2 cm or less and left for about 24 hours. This casserole is hydrothermally treated at 90 ° C. for 20 minutes under a tension state of 4 mg / dtex, and then hung on a rod of 2 cm or less and left for about 12 hours. After leaving the cassette, one end of the cassette is hooked and the other end is subjected to initial load and measurement load. Initial load (g) at this time = 1.8 mg / dtex, measurement load (g) = 90 mg / dtex, water temperature = 20 ± 2 ° C. Measure the length of the inside of the left casket and let it be L. Further, the test piece is left for 2 minutes under the condition of only the initial load excluding the measurement load, and the length of the inside of the left case is measured to be L1. The stretch recovery rate is obtained by the following formula.
[0041]
Stretch recovery rate (CR) (%) = [(L−L1) / L] × 100
(2) Stretch recovery rate under side load (YR)
Using a measuring machine with a circumference of 0.8 m, a cake is obtained under a tension of 90 mg / dtex. The number of turns of the cassette is adjusted so that the total decitex at that time is closest to 2600 (dtex). The obtained cake is passed through a glass tube having an inner diameter of 3.65 mm. One end of the cassette is held by a glass tube, a load of 150 g is applied to the other end, and the cassette is cut at the glass tube outlet on the side where the load is applied. The cassette cut to the length (L) of the glass tube is subjected to hot water treatment at 90 ° C. for 3 minutes while being put in the tube, and the length (L1) after squeezing is expressed under the side pressure of the tube is measured. The stretch recovery rate under side load is obtained by the following formula.
[0042]
Stretch recovery rate under side load (YR) (%) = [(L−L1) / L] × 100
(3) Number of residual torques
Temporary twisted yarn is collected from the cheese so that torque does not enter, and it is hung on a hook and two yarns are stacked, and an initial load of 0.1 g / dtex is applied to a place 1 m or more from the hook. Under the load, a load of 0.025 g / dtex is applied 1 m from the hook to remove the initial load. When the lower end is made free, it is rotated by the residual torque and twisted with two yarns. Measure the number of twists when stationary with a tester. Calculate with the average value of 5 times.
[0043]
(4) Growth recovery rate
Using a constant-speed extension type tensile tester with a self-recording device, with an initial load of 0.08826 cN per decitex, it is mounted at a distance of 20 cm, and the tensile speed is 20 cm / min. It was stretched and immediately deweighted at the same speed. Immediately after complete de-weighting, it is stretched to the initial load, and the elongation recovery rate is obtained from the recovery elongation at this time.
[0044]
(5) Young's modulus
Measurement was performed using a constant speed extension type tensile tester according to the initial tensile resistance measurement described in JIS-L-1013, 8.10.
[0045]
(6) Stretch
It measured according to JIS-L-1096.
[0046]
【Example】
Hereinafter, the present invention will be specifically described with reference to Examples.
[0047]
In the examples of the present invention, the polyester unstretched yarn was stretched simultaneously and temporarily twisted by a stretching temporary twisting apparatus as shown in FIG.
[0048]
In addition, evaluation in an Example was performed with the following method.
[0049]
(1) Evaluation of software
The softness of the woven fabrics obtained by the methods described in Examples and Comparative Examples was sensory-evaluated by touch. At this time, using the woven fabric of Comparative Example 1 which is a conventional product as a standard, a five-step evaluation was performed according to the following criteria, and the evaluation results of 10 panelists were averaged and determined.
5: Extremely soft texture
4: Slightly soft texture
3: Texture equivalent to standard fabric
2: Slightly firm texture
1: Extremely hard texture.
[0050]
(2) Evaluation of surface quality
The surface quality of the woven fabrics obtained by the methods described in Examples and Comparative Examples was subjected to sensory evaluation based on touch. At this time, using the woven fabric of Comparative Example 1 which is a conventional product as a standard, a five-step evaluation was performed according to the following criteria, and the evaluation results of 10 panelists were averaged and determined.
5: Very good surface quality
4: Slightly good surface quality
3: Surface quality equivalent to standard fabric
2: Slightly poor surface quality
1: Extremely poor surface quality
Example 1
Transesterification was performed while distilling methanol at 140 to 230 ° C. using tetrabutyl titanate as a catalyst for dimethyl terephthalic acid and 1,3-propanediol. Further, polymerization was carried out under a constant temperature of 250 ° C. to obtain polytrimethylene terephthalate.
[0051]
Polytrimethylene terephthalate having an ultimate limit [η] of 0.89 obtained as described above was discharged by a normal spinning machine at a spinning temperature of 260 ° C. using a round and 36-hole die. Dry heat treatment was performed with a 2-godey roll heated to 110 ° C. while being drawn at a spinning speed of 3000 m / min to obtain a highly oriented undrawn yarn with 130 dtex36 filaments and an elongation of 109.8%, which was used as a core yarn. As the sheath yarn, a highly oriented undrawn polyethylene terephthalate having 106 dtex 36 filaments and an elongation of 168.2% was used.
[0052]
Using the temporary twisting process shown in FIG. 1, temporary twisting and relaxation heat treatment were performed under the conditions shown in Table 1 to obtain a composite temporary twisted yarn. The stretch recovery rate under load of the obtained processed yarn was 26.2%, and the stretch recovery rate under side load was 59.2%.
The obtained composite temporary twisted yarn was twisted in the S direction at 500 T / m and used as the weft, and the warp yarn was 56 Dtex and a 24 filament polyethylene terephthalate drawn yarn (twisted in the S direction at 250 T / m). The fabric was woven with a 3/1 twill using a rapier loom. Subsequently, relaxed refining with hot water at 97 ° C., dyed at 130 ° C. with disperse dye of terrasil navy blue color, and heat-fixed at 160 ° C. to obtain a composite temporary twisted process. The fabric using this composite temporary twisted yarn had both high stretchability, bulkiness and soft touch. Moreover, the texture was spun-like, and the surface quality of the fabric and the stretch back property were good.
[0053]
(Example 2)
A highly oriented undrawn yarn similar to that in Example 1 was used for the core yarn and the sheath yarn, and temporary twisting was performed under the conditions of Table 1 in which the first and second heater temperatures were increased in Example 1, and the composite temporary A twisted yarn was obtained. The stretch recovery rate under load of the obtained processed yarn was 27.5%, and the stretch recovery rate under side load was 66.6%. Using this, a fabric was prepared in the same manner as in Example 1. Compared with Example 1, the stretch increased slightly, and the softness and surface quality were inferior, but the fabric using the yarn of the present invention had both high stretchability, bulkiness and soft touch. . The texture was spun-like, and the surface quality of the fabric and the stretch back property were good.
[0054]
(Comparative Example 1)
Polyethylene terephthalate highly oriented unstretched yarn having 130 Dtex36 filament and elongation of 145.8% was used for the core yarn, and polyethylene terephthalate highly oriented unstretched yarn similar to that of Example 1 was used for the sheath yarn. Temporary twisting and relaxation heat treatment were performed under the conditions in Table 1 to obtain a composite temporary twisted yarn. The obtained fabric had softness and good surface quality, but had low stretchability.
[0055]
[Table 1]

[0056]
【The invention's effect】
As described above, the composite temporary twisted yarn of the present invention is a composite temporary twisted yarn that exhibits high stretchability, has bulkiness and a soft and spun-like texture, and has good stretchback properties. .
[0057]
In the conventional composite twisted yarn, the core yarn is constrained by the sheath yarn and the stretchability is lowered. However, in the composite temporary twisted yarn of the present invention, the filament A serving as the core yarn is ahead of the filament B serving as the sheath yarn. Because of the stretch expression, it becomes a composite processed yarn with rich stretch properties.
[0058]
Furthermore, by performing the relaxation heat treatment with the second heater, there is little feeling of fluffiness peculiar to the temporary twisted yarn, and a soft texture is obtained when a woven or knitted fabric is formed. Moreover, since the unevenness of the surface is reduced, a woven or knitted fabric excellent in surface quality can be obtained.
[0059]
Further, when a knitted fabric using the composite temporary twisted yarn of the present invention is dyed, a spun-like knitted fabric having a toned color difference can be obtained. By surrounding the yarn made of polytrimethylene terephthalate, which is dyed darker than polyester such as polyethylene terephthalate, with the yarn made of polyester such as polyethylene terephthalate, it is possible to obtain a natural sensation-like dyeing difference with blurred color difference.
[0060]
In addition, since the composite temporary twisted yarn of the present invention exhibits a good elongation recovery rate, when it is made into a woven or knitted fabric, a good stretch back property can be obtained, and the woven or knitted fabric sufficiently follows the stretch particularly in sports clothing. In addition, the occurrence of cracks at the elbows and knees can be suppressed.
[0061]
Moreover, since the composite temporary twisted yarn of the present invention is excellent in bulkiness, it has a bulge and becomes a woven or knitted fabric excellent in lightness and heat retention.
[0062]
The fabric comprising the composite temporary twisted yarn of the present invention is used for clothing, particularly outerwear such as jackets and bottoms, women's clothing such as dresses, skirts and arm warmers, and stretch materials such as sports clothing such as jerseys, athletic wear and ski wear. Can be used as
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a process for producing a composite temporary twisted yarn of the present invention.
FIGS. 2A and 2B show an example of a composite temporary twisted yarn of the present invention, where FIG. 2A shows a side surface of the whole yarn, FIG. 2B shows a cross-sectional view taken along the line 1B-1B ′ in FIG. 1 shows a 1C-1C ′ cross-sectional view in (A), respectively.
.
[Explanation of symbols]
1A: Filament A (polytrimethylene terephthalate undrawn yarn package)
1B: Filament B (polyester undrawn yarn package
2: Feed roller
3: First heater
4: Cooling plate
5: Temporary twister
6: Deliberry Roller
7: Second heater
8: Feed roller
9: Entanglement nozzle
10: Feed roller
11: Take-up roller

Claims (4)

The filament A is made of a composite yarn entangled by performing a relaxation heat treatment after simultaneously arranging the filament A made of polytrimethylene terephthalate and the filament B made of polyester having a higher elongation than the filament A , A composite temporary twisted yarn characterized by satisfying the following yarn properties.
・ Residual torque number is 75 (T / m) or less・ 20 ≦ Ken contraction temperature difference (CRT (B) −CRT (A)) (° C.) ≦ 40
(However, CRT: Temperature (° C) reaching 80% of stretch recovery rate under load) The composite temporary twisted yarn according to claim 1, wherein the yarn physical properties satisfy the following formula.
・ 10 ≦ Stretch recovery rate under load (SR) (%) ≦ 40
・ 40 ≦ Stretch recovery rate under side load (YR) (%) ≦ 80  The composite temporary twisted yarn according to claim 1 or 2, wherein the filament B is a filament yarn made of polyethylene terephthalate, polymethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate or polyhexamethylene terephthalate.  The filament A made of polytrimethylene terephthalate and the filament B made of polyester having a higher elongation than the filament A are aligned and subjected to provisional twisting at the same time, and then subjected to relaxation heat treatment and entangled. A method of manufacturing a composite temporary twisted yarn.

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