JP4660882B2 - Composite false twisted yarn and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite false twisted yarn and a method for producing the same.
[0002]
[Prior art]
For example, Japanese Patent Application Laid-Open No. 7-118976 discloses a method in which two or more polyethylene terephthalate multifilaments having different elongations are entangled and false twisted. By this method, a woven fabric that is bulky and rich in resilience can be obtained, but on the other hand, there is a drawback that it has a strong feeling of coarseness and lacks a soft feeling and is not sufficiently stretchable due to constraining by entanglement. In order to improve the soft feeling, it is conceivable to reduce the single fineness of the constituent fibers, but this has the disadvantage that the elasticity is lost and the bulkiness is lost.
[0003]
Also, composite false twisted yarn, for example, when the yarn is squeezed by the traveler of the twisting machine at the time of additional twisting, the sheath yarn is displaced in the longitudinal direction of the yarn and is unevenly distributed. As a process passability, there has been a problem of so-called nep generation that causes unwinding failure and thread breakage.
Of course, if the pressure / pneumatic pressure of the nozzle is increased and strong entanglement is applied, the generation of nep can be suppressed, but the sheath yarn is restrained by the entanglement, so the stretchability disappears, and the core is wound around the core yarn in an alternating twisted manner. As the sheath structure, the yarn length difference is extremely small, and it becomes a processed yarn having a strong feeling of coarseness without swelling.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a composite false twisted yarn having both bulkiness and resilience and a soft texture, and having excellent stretch properties, dimensional stability, and processability, and a method for producing the same. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a composite filament processed yarn and a method for producing the same according to the present invention have the following configurations.
[0006]
That is, the present invention comprises a core yarn made of polytrimethylene terephthalate and a sheath yarn made of polyester, the core yarn and the sheath yarn are entangled with each other and satisfy the following formula , and the Young's modulus is 15 cN / dtex or more, A composite false twisted yarn characterized by having an elongation recovery rate of 25 cN / dtex or less at 20% elongation of 80% or more .
Y value (entanglement uniformity) ≧ 12
DLmax ≦ 20mm
Y value = number of entanglements per meter / DLmax
DLmax: Maximum length of unentangled part per meter (mm)
[0007]
The present invention also provides a composite false twisted yarn as described above by subjecting a filament made of polytrimethylene terephthalate and a filament made of polyester having a higher elongation than the filament to intertwine and then false twisting. It is the manufacturing method of the composite false twisted yarn characterized by obtaining .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As the core yarn of the processed yarn 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.
[0009]
A yarn made of polytrimethylene terephthalate has low bending rigidity, and a soft texture can be obtained when the processed yarn of the present invention is used as a fabric. Moreover, the outstanding stretch property can be obtained by using the thread | yarn which consists of polytrimethylene terephthalate for a core thread | yarn. Furthermore, since the yarn made of polytrimethylene terephthalate is excellent in elastic recovery, a composite false twisted yarn can be formed while pulling the sheath yarn in the false twisting process, and thus the composite state of the core sheath of the processed yarn is strong. It becomes entangled and can suppress the occurrence of nep. If a yarn made of polytrimethylene terephthalate is not used as the core yarn, the elastic recovery is inferior and nep is generated.
[0010]
As the elastic recovery property of the filament made of polytrimethylene terephthalate used for the core yarn, it is preferable that the elongation recovery rate at 20% elongation is 60% or more.
[0011]
A copolymer component capable of forming another ester bond may be contained in a range not losing the effect of the present invention, preferably 20 mol% or less, more preferably 10 mol% or less. Examples of copolymerizable compounds include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while glycol components include, for example, ethylene glycol and diethylene glycol. , Butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol and the like, but are not limited thereto. Further, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments, and the like can be added as necessary.
[0012]
The intrinsic viscosity of this polytrimethylene terephthalate 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 more, stable spinning can be performed and the texture of the fiber can be softened. More preferably, it is 0.8 or more and 1.0 or less.
[0013]
On the other hand, a yarn made of polyester is used for the sheath yarn of the processed yarn of the present invention. The yarn made of polyester refers to a filament yarn whose main component is any one of polyethylene terephthalate, polymethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyhexamethylene terephthalate. From the viewpoint of iron resistance, it is preferable to use polyethylene terephthalate.
[0014]
Further, when polytrimethylene terephthalate is also used for the sheath yarn, the surface touch of the fabric has a soft texture with a nylon-like smooth feeling, which is also preferable.
[0015]
The single yarn cross-sectional shape of the core yarn and the sheath yarn of the present invention is not particularly limited, and the fineness is suitably in the range of 30 dtex to 1000 dtex according to the purpose of use, such as a circle, a triangle, a flat shape, and a hexagon. Just choose. In order to obtain soft touch, the single fiber fineness of the sheath yarn is preferably 3 denier or less, more preferably 0.5 to 1.5 denier.
[0016]
Next, a false twisting method using the core yarn and sheath yarn will be described. In the method for producing a composite false twisted yarn of the present invention, a polytrimethylene terephthalate filament and a filament made of polyester having a higher elongation than the polytrimethylene terephthalate filament are combined and entangled, and then false twisting is performed. Apply.
[0017]
By combining two or more types of filaments having a difference in elongation and entanglement treatment, first, fixing between the two filaments to the extent that it can withstand false twisting can be obtained. If false twisting is performed without performing the entanglement process, it causes fluff and tarmi generation.
Next, when false twisting is performed, the filaments on the high elongation side are selectively drawn in the false twisting process, and a yarn length difference is generated between the filaments on the low elongation side and the filaments on the low elongation side are cored. It is possible to obtain a composite false-twisted yarn having a yarn and a sheath yarn that is on the high elongation side. As the difference in elongation,
High elongation side elongation (%) − low elongation side elongation (%) ≧ 50
It is preferable that
[0018]
In the present invention, the filament made of polytrimethylene terephthalate can be supplied as a drawn yarn, and the filament made of the other polyester can be supplied as a semi-drawn yarn.
[0019]
Alternatively, both filaments may be semi-stretched yarns, and the filaments of polytrimethylene terephthalate on the low elongation side may be stretched through a heat pin at a glass transition temperature or higher and then combined with the other half-stretched yarn.
[0020]
FIG. 1 is a schematic view showing an example of a method for producing a composite false twisted yarn of the present invention. The yarn A and the yarn B are aligned on the feed roller 1 and entangled with the nozzle 2 preferably at 1.0 to 5.0 MPa. As a nozzle which performs the confounding process in the present invention, either a taslan nozzle or an interlace nozzle may be used. Here, the yarn A is pulled by the feed roller 1 and guided to the entanglement zone through the feed roller 1 while being unwound, and relaxed at the moment of entering the entanglement zone. Stretched back just before the nozzle and entangled while winding the yarn B because it is a stretched trimethylene terephthalate yarn, and after twisting, the sheath yarn does not separate into the core yarn and is strongly twisted in alternating twist The surrounding core-sheath structure is obtained.
[0021]
Between the feed roller 1 and the feed roller 3, it is preferable to give an overfeed of 0.5 to 5.0% because it can be entangled more efficiently.
[0022]
The entangled yarn is introduced into the hot plate 4 and heat-set while false twisted by the twisted body 5. As a twisted body used for false twisting, a pin, friction, a belt nip, or the like can be used. The false twisting temperature is preferably in the range of 130 ° C. or higher and 190 ° C. or lower. By setting the false twisting temperature to 130 ° C. or higher, crimps are sufficiently imparted and good stretchability is obtained. Moreover, by setting the false twisting temperature to 190 ° C. or lower, it is possible to suppress the occurrence of single yarn breakage and fluff due to thermal degradation of the fiber. In particular, when polytrimethylene terephthalate yarn is used for the sheath yarn, the false twisting temperature is more preferably 170 ° C. or lower because the melting point is low.
[0023]
The false twisted processed yarn passes through the delivery roller 6 and is taken up by the take-up roller 7.
[0024]
After the actual yarn is put into the processed yarn of the present invention to further form a woven fabric, a moderate amount of elasticity can be obtained by adding a weight reduction or the like.
[0025]
The composite false twisted yarn of the present invention comprises a core yarn made of polytrimethylene terephthalate and a sheath yarn made of polyester. The core yarn and the sheath yarn are entangled with each other and satisfy the following formula.
Y value (entanglement uniformity) ≧ 12
DLmax ≦ 20mm
Y value = number of entanglements per meter / DLmax
DLmax: Maximum length of unentangled part per 1 m (mm).
[0026]
Here, the number of entanglements is the number of entangled portions per meter under a tension of 0.1 g / d. A pin is inserted into the non-entangled portion under a tension of 0.02 g / d, and 0.1 g over 1 m of yarn. The pin is moved up and down in the longitudinal direction of the yarn with a tension of / d, the distance moved is defined as an unentangled portion, the maximum length thereof is defined as DLmax, and the portion where the pin stops is defined as an entangled portion. Here, the untwisted portion of the yarn is also counted as an entangled portion. Furthermore, the portion where the sheath yarn is wound around 360 ° or more around the core yarn is also counted as the entangled portion. That is, DLmax is the maximum value of the distance from the entangled portion to the entangled portion including these untwisted portions and portions wound around 360 ° or more in a 1 m yarn. The entanglement uniformity Y value is desirably obtained by measuring the same yarn at least 5 times, preferably 10 times or more, and averaging the values except for the minimum and maximum values. The high degree of entanglement uniformity means that the number of entangled portions is large and the portion where the core yarn and sheath yarn are not entangled is small. Conversely, a small degree of entanglement uniformity means that there are few entangled parts or many entangled parts but large unentangled parts.
[0027]
Insufficient entanglement in composite false twisted yarn, core yarn and sheath yarn are easy to separate, and the yarn is squeezed by the traveler of the twisting machine at the time of additional twisting, forming a nep or forming a knitted fabric Sometimes it becomes white streaks. Therefore, the entanglement uniformity Y value is 12 or more, and the maximum length DLmax. Must be 20 mm or less.
[0028]
The Young's modulus of the processed 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, false twisting conditions, additional twisting conditions, etc., which are the main factors that determine the texture such as bending softness when forming a knitted fabric. Become. By setting the Young's modulus to 15 cN / dtex or less, the texture becomes soft, and by setting the Young's modulus to 25 cN / dtex or more, it is possible to maintain elasticity and rebound.
[0029]
The elongation recovery rate at 20% elongation of the processed yarn of the present invention is preferably 80% or more. If it is 80% or more, when a knitted fabric is formed, good shape stability and stretchability can be obtained, and it is suitable as a stretch material. Especially in sports clothing, the knitted fabric sufficiently follows the stretch, The occurrence of cracks at the elbows and knees can be suppressed.
[0030]
The woven or knitted fabric using the yarn of the present invention has a soft surface touch, elasticity, swell, lightness, coolness, stretchability, and form stability, and is particularly suitable for clothing, especially jackets, bottoms and other outerwear, dresses, skirts, It can be used as a stretch material such as women's clothing such as arm warmers, sports clothing such as jerseys, athletic wear, and ski wear.
[0031]
【Example】
(Measuring method)
(1) Elongation recovery rate Using a constant speed extension type tensile tester with a self-recording device, mounting at an interval of 20 cm with an initial load of 0.08826 cN per decitex, with a tensile speed of 20 cm / min, It was stretched to 20% elongation and immediately deweighted at the same rate. Immediately after complete dewetting, it was stretched to the initial load, and the recovery elongation at this time was defined as the elongation recovery rate.
[0032]
(2) Young's modulus Measured by using a constant speed extension type tensile tester according to the initial tensile resistance measurement described in JIS-L-1013, 8.10.
[0033]
Example 1
(1) Transesterification was performed while distilling methanol at 140 to 230 ° C. using tetrabutyl titanate as a catalyst for the core yarn dimethyl terephthalic acid and 1,3-propanediol. Furthermore, polymerization was performed under the condition of a constant temperature of 250 ° C. to obtain polytrimethylene terephthalate.
[0034]
The 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 shape and a 24-hole die, and spinning. Spinning was performed at a speed of 1800 m / min to obtain an undrawn yarn. The obtained undrawn yarn was drawn at a 1st hot roll temperature of 70 ° C., a draw ratio of 1.4 times, a 2nd hot roll temperature of 130 ° C. and a drawing speed of 600 m / min, and then taken up using a spindle take-up device, and 83 dtex 24 A filament, a drawn yarn having a Young's modulus of 23.3 cN / dtex, an elongation of 40.9%, and an elongation recovery rate of 66.9% at 20% elongation was obtained and used as a core yarn.
[0035]
(2) Sheath yarn 106 dtex 36 filament, polyethylene terephthalate semi-drawn yarn having an elongation of 168.2% was used.
[0036]
(3) Composite false twisting Using a false twisting process as shown in Fig. 1, false twisting was carried out under the following conditions.
Yarn speed: 300 m / min (delivery roller 6)
Twisted body: Friction twister false twisting direction: S
D / Y ratio: 1.6
False twisting temperature: 170 ° C
Used nozzle: Interlace nozzle Overfeed rate of nozzle section: + 2%
Nozzle pressure: 0.2 MPa
Stretch ratio: 1.142
The obtained composite filament processed yarn had a Y value of 25.3, a DLmax of 9.8 mm, a Young's modulus of 20.3 cN / dtex, and an elongation recovery rate at 20% elongation of 87.2%.
[0037]
(4) Fabric Evaluation The above-mentioned composite processed yarn was twisted in the S direction and used as a weft. A 56 dtex, 24-filament polyethylene terephthalate drawn yarn was used as a warp and woven with a rapier loom to form a woven fabric. Nep did not occur and the process passability was good. Subsequently, it was relaxed and refined with hot water at 97 ° C., dyed at 130 ° C. with disperse dye of terrasil navy blue, and heat-fixed at 160 ° C. for finishing. The fabric using the yarn of the present invention was excellent in dyeability and resilience, had a soft touch, and had good dimensional stability and stretchability.
[0038]
(Example 2)
(1) The same core yarn as in Example 1 was used.
[0039]
(2) Scabbard yarn As in Example 1, polytrimethylene terephthalate having an ultimate limit [η] of 0.89 was spun at a spinning temperature of 260 ° C. with a normal spinning machine, and a round shape and a 36-hole die were used. It was discharged and subjected to a dry heat treatment with a 2-godey roll heated to 110 ° C. while being pulled at a spinning speed of 3000 m / min to obtain a 106 dtex 36 filament, a semi-drawn yarn having an elongation of 109.8%, and this was used as a sheath yarn.
[0040]
(3) Composite false twisting The entanglement treatment and simultaneous drawing false twist were performed under the same conditions as in Example 1 to obtain composite filament processed yarn. The Y value of the processed yarn was 19.6, DLmax was 12.9 mm, Young's modulus was 16.4 cN / dtex, and the elongation recovery rate at 20% elongation was 89.2%.
[0041]
(4) Fabric Evaluation A woven fabric was formed by additionally twisting the composite filament processed yarn as a weft. Nep did not occur and the process passability was good. Subsequently, it was relaxed and refined with hot water at 97 ° C., dyed with a disperse dye of terrasil navy blue, and heat-fixed at 160 ° C. for finishing. The fabric had good dyeability, dimensional stability and stretchability as in Example 1.
[0042]
(Comparative Example 1)
(1) Polyethylene terephthalate drawn yarn with a core yarn fineness of 83 dtex, 24 filaments, Young's modulus of 81.2 cN / dtex, elongation of 32.2%, and elongation recovery rate of 36.1% at 20% elongation is used. It was.
[0043]
(2) Polyethylene terephthalate semi-drawn yarn having a sheath yarn fineness of 106 dtex filaments of 36 and an elongation of 168.2% was used.
[0044]
(3) Composite false-twisting Simultaneously drawing false twist under the same conditions as in Example 1 to obtain composite filament processed yarn. The Y value of the processed yarn was 16.8, DLmax was 14.1 mm, Young's modulus was 30.4 cN / dtex, and the elongation recovery rate at 20% elongation was 48.4%. As in Example 1, after tapping, 1/3 twill fabric prepared using this comparative yarn has uneven dyeing and rich resilience, but lacks softness and has a feeling of coarseness and is dimensionally stable. The fabric was poor in stretchability. In the additional twisting process, the processed yarn was squeezed into a nep and many yarn breaks occurred.
[0045]
【The invention's effect】
According to the present invention, it is possible to provide a composite false twisted yarn having both bulkiness and resilience and a soft texture, and having excellent stretch properties, dimensional stability, and process passability, and a method for producing the same.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of a processing step for obtaining a processed yarn of the present invention.
[Explanation of symbols]
A: Polytrimethylene terephthalate drawn yarn B: Polyester semi-drawn yarn 1: Feed roller 2: Nozzle 3: Feed roller 4: Hot plate 5: Twisted body 6: Delivery roller 7: Take-up roller

Claims (2)

It consists of a core yarn made of polytrimethylene terephthalate and a sheath yarn made of polyester, the core yarn and the sheath yarn are entangled with each other, satisfy the following formula , and the Young's modulus is 15 cN / dtex or more and 25 cN / dtex or less A composite false twisted yarn having an elongation recovery rate of 80% or more at 20% elongation .
Y value (entanglement uniformity) ≧ 12
DLmax ≦ 20mm
Y value = number of entanglements per meter / DLmax
DLmax: Maximum length of unentangled part per meter (mm) The composite false twisted yarn according to claim 1 is obtained by subjecting a filament made of polytrimethylene terephthalate and a filament made of polyester having a higher elongation than the filament to intertwine and then false twisting. A method for producing a composite false twisted yarn.

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