JP6192581B2 - False twisted yarn - Google Patents

Description

The present invention relates to a false twisted yarn for a friction-melt resistant fabric.

Polyester fibers are widely used in the sports clothing field because of their excellent mechanical and chemical properties. However, synthetic fibers such as polyester, unlike natural fibers such as cotton and rayon, melt the fabric due to frictional heat generated between the floor and the fabric when sliding in a gymnasium or the like, resulting in a hole in the fabric. Has drawbacks.

Many proposals have been made to solve such problems. In particular, as a method for improving the polyester fiber itself, Patent Documents 1 to 3 propose a method using a core-sheath type composite fiber in which a low melting point polymer having a melting point lower than that of polyester is arranged in the core of the polyester fiber. As described above, the melting heat of the polyester is reduced by absorbing the heat of friction generated by the friction by the endothermic action of the low melting point polymer of the core before the polyester of the sheath melts. In addition, when the frictional heat is released, it is recognized that the low melting point polymer of the core part solidifies again, and the core part wrapped in the sheath inside the fiber is used repeatedly due to reversible phase change. Is possible.

JP 4-11006 A JP-A-6-49712 Japanese Patent Application No. 4-65537

However, the methods of Patent Documents 1 to 3 describe that polyolefin is used as the low melting point polymer of the core part. In this case, since the affinity with polyester is insufficient, polyester is used for the sheath part. When the core-sheath composite fiber is arranged, the core-sheath is easily peeled off during the post-process such as spinning or false twisting. For this reason, there are problems such as inferior durability such as dyeing spots in the dyeing process and peeling of the core sheath.

In particular, in false twist processing where heat and external force are greatly applied, when performed under the same processing temperature conditions as polyester fibers, not only the sheath between the core and sheath but also cracks in the sheath and polyolefin in the core leaks out. This causes a problem that a large amount of white powder is generated.

If the core is processed under low temperature conditions in consideration of the melting point of the polyolefin, a polyester false twisted yarn having sufficient stretchability and bulkiness cannot be obtained.

Accordingly, a first object of the present invention is to provide a false twist yarn for friction-melt resistant fabric that improves the above problems, reduces core-sheath peeling, and has good dyeability.
The second object of the present invention is to provide a false twist yarn for a friction-melt resistant fabric having good stretchability and bulkiness.

The present inventors use polymer alloy technology to reduce the separation of the polymer interface by forming a sea-island alloy structure in which polyolefin is stably dispersed in polyester, and the sea phase is polyester and the island phase is polyolefin. Furthermore, by using this polymer alloy as a core-sheath type structural yarn with a polyester at the core and polyester at the sheath, the friction between the core and the sheath is good and the friction between the core and sheath can be suppressed. It has been found that a false twisted yarn can be obtained.

That is, the present invention is a false twisted yarn using a composite fiber comprising a core part and a sheath part that completely covers the core part, and the polymer of the core part is a polymer alloy comprising two or more types of thermoplastic polymers. The polymer alloy comprises a polyester, a polyolefin, and a compatibilizing agent. The polymer alloy is formed by forming a sea-island structure in which the sea phase is polyester and the island phase is polyolefin, and the sheath polymer is polyester. The gist of the false twisted yarn for a friction-resistant and melt-resistant fabric, which is characterized.

The false twisted yarn preferably has an expansion / contraction recovery rate of 20% or more, and the polyolefin is at least one selected from the group consisting of low density polyethylene, linear low density polyethylene or high density polyethylene. A polymer is preferred.
The false twisted yarn preferably uses a composite fiber in which the mass ratio of polyester and polyolefin in the polymer alloy of the core is 95: 5 to 55: 45% by mass, and the residual torque is 30 T / m or more. More preferably, the strength is 3.0 cN / dtex or more, and the elongation is more preferably 30% or more.

Further, in the present invention, the core polymer is a polymer alloy composed of two or more thermoplastic polymers, and the polymer alloy includes a polyester, a polyolefin and a compatibilizing agent, and the polymer alloy has a sea phase of polyester, Using composite fibers in which the island phase forms a sea-island structure of polyolefin and the core is not exposed on the fiber surface, false twisting is performed under the conditions of a heater temperature of 180 to 220 ° C. and a twist number of 3000 to 4000 T / m. It is also a method for producing a false twisted yarn for a friction-resistant and melt-resistant fabric.

According to the present invention, there is provided a false twisted yarn for a friction-melt-resistant fabric that has excellent extensibility and bulkiness without peeling or cracking of the core sheath even when false twisted under the same temperature conditions as general polyester. Can be obtained.
According to the false twisted yarn for friction-melt resistant fabric of the present invention, there will be no dyeing spots in the dyeing process.
According to the method for producing a false twisted yarn for friction-melt resistant fabric of the present invention, a false twisted yarn for friction-resistant melt resistant fabric having good extensibility and bulkiness without peeling or cracking of the core sheath is obtained. be able to.

FIG. 1 is an example of a composite fiber used in the present invention.

Hereinafter, the present invention will be described in detail.

The present invention is a false twisted yarn for friction-resistant and melt-resistant fabric.
This false twisted yarn has a form using polyester and polyethylene polymer alloy for the core and polyester for the sheath.

First, the polymer of the sheath part and the polyester as the sea phase of the core part of the present invention will be described.
The polyester of the present invention is a polymer synthesized from a dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof. Examples of such polyester include polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate. From the viewpoint of mechanical properties and spinnability, polyethylene terephthalate or polybutylene terephthalate is preferable.

In addition, other components may be copolymerized with these polyesters as long as the object of the present invention is not impaired. Specifically, examples of the copolymer component include isophthalic acid, naphthalenedicarboxylic acid, 4,4-diphenyldicarboxylic acid, adipic acid, sebacic acid, and ester-forming derivatives thereof as dicarboxylic acid components. Examples of the diol component include diethylene glycol, hexamethylene glycol, neopentyl glycol, and cyclohexane dimethanol. Further, polyoxyalkylene glycols such as polyethylene glycol and polypropylene glycol are also included. The amount of copolymerization is preferably within 10 mol%, more preferably within 5 mol%, per repeating unit.

As a method for producing the polyester of the present invention, first, esterification or transesterification was carried out according to a conventional method using the above-mentioned dicarboxylic acid or its ester-forming derivative and diol or its ester-forming derivative as main starting materials. Thereafter, a method of producing the product by performing a polycondensation reaction at a higher temperature and reduced pressure may be used.

The polyester viscosity of the present invention is not particularly limited, and a polyester having an intrinsic viscosity [η] utilized for ordinary polyester fibers can be used. In view of spinnability and mechanical strength of the fiber, for example, polyethylene terephthalate, the intrinsic viscosity [η] is preferably 0.4 to 1.5, and the intrinsic viscosity [η] is 0.55 to 1. More preferably 0.

As long as the object of the present invention is not impaired, these polyesters contain a small amount of other polymers, antioxidants, heat stabilizers, matting agents, pigments, ultraviolet absorbers, fluorescent whitening agents, plasticizers. Or other additives may be contained.

Next, the polyolefin that is the island phase of the core of the present invention will be described.
In order to obtain the friction melt resistance of the polyester composite fiber, a polymer having a melting point lower than that of polyester is dispersed in the core polymer. In order to maximize the frictional melting resistance, a polymer having a large melting point difference from the polyester and a large heat of fusion is preferable, and a polymer that can withstand the melt spinning temperature of the polyester is preferable. Examples of the polymer that satisfies these requirements include polyolefin. Examples of the polyolefin include low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polymethylpentene, and copolymers thereof. Among these, low-density polyethylene, linear low-density polyethylene, or high-density polyethylene having a good affinity for polyester as compared with other polyolefins and having a large heat of fusion is preferable. Particularly preferred is high density polyethylene. The low density polyethylene has a density of 0.910 to 0.929, the linear low density polyethylene has a density of 0.930 to 0.941, and the high density polyethylene has a density of 0. .942 or more. These polyolefins may be used alone or in combination of two or more. The density here is the ratio of the mass and volume of the sample, and is expressed in g / cm ³ as a unit.

In addition, these polyolefins may contain a small amount of other polymers, antioxidants, heat stabilizers, matting agents, pigments, ultraviolet absorbers, fluorescent whitening agents, plasticizers, or the like, as long as the object of the present invention is not impaired. Other additives and the like may be contained.

The mass ratio of polyester and polyolefin in the polymer alloy of the core of the present invention is preferably 95: 5 to 55:45, more preferably 85:15 to 60:40. If the polyolefin is less than 5% by mass, there is a risk that sufficient frictional melt resistance as the resulting polyester composite fiber cannot be obtained. On the other hand, when the amount of the polyolefin is more than 45% by mass, the dispersion of the polyolefin in the polyester is deteriorated, so that the spinnability may be deteriorated and the sea phase and the island phase of the phase structure may be reversed.

Next, the compatibilizing agent contained in the polymer alloy of the core part of the present invention will be described.
The polymer alloy which is the core component of the present invention has insufficient compatibility between the polyester and the polyolefin, and therefore, when the polymer alloy is obtained by melt-mixing by a usual method, the dispersibility of the polyolefin in the polyester is poor and the spinnability is increased. Deterioration of the fiber properties obtained. Therefore, in the present invention, it is necessary to add a compatibilizing agent to the polymer alloy. The compatibilizing agent in the present invention is a compound that acts on a polymer interface and stabilizes the morphology of both when two or more kinds of polymers are mixed. In the present invention, the addition of a compatibilizing agent serves to stabilize the dispersion of the polyolefin in the polyester and to improve the spinnability. As a result, the polyolefin can be stably highly dispersed in the polyester. In the case of the polymer alloy of polyester and polyolefin in the present invention, the compatibilizer used includes modified polyolefin. The modified polyolefin is a polyolefin having functional groups such as carboxylic acid, carboxylic acid metal base, carboxylic acid ester group, acetic anhydride, and epoxy group in the molecule. Any random copolymer, block copolymer, or graft copolymer may be used as long as the monomer having these functional groups is a copolymerized polyolefin. Examples of the polyolefin include a polymer mainly composed of polyethylene, polypropylene, and polybutene, and a copolymer such as an ethylene / propylene copolymer, an ethylene / butene copolymer, and an ethylene / hexene copolymer. .

Specific examples of the compatibilizing agent that can be used in the present invention include ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ethylene / ethyl acrylate copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, Glycidyl methacrylate copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer, maleic anhydride grafted polyethylene, acrylic acid grafted polyethylene, maleic anhydride grafted ethylene / propylene copolymer, ethylene / propylene-methacrylic acid grafted glycidyl copolymer Polymers, maleic anhydride grafted ethylene / propylene / 1,4-hexadiene copolymer, acrylic acid grafted ethylene / vinyl acetate copolymer, etc., and these compatibilizers may be used alone, Two or more kinds may be used in combination.

The addition amount of the compatibilizing agent is preferably 0.1 to 30% by mass (external addition), more preferably 0.3 to 20% by mass with respect to the entire polymer alloy. If the compatibilizer is less than 0.1% by mass, it is difficult to improve the compatibility between the polyester and the polyolefin. On the other hand, if the compatibilizer exceeds 30% by mass, the compound itself becomes an inhibitor, resulting in poor spinnability and fiber properties. It is not preferable because a decrease occurs.

The method for producing the polymer alloy in the present invention is not particularly limited. For example, (1) polyester, polyolefin, and compatibilizing agent are dry blended and then directly fed into a spinning machine and mixed in a spinning machine flow path. Method, (2) A method in which polyester, polyolefin and compatibilizer are dry blended and then melt-kneaded using various general kneaders. (3) Polyolefin and compatibilizer are added to polyester respectively in an extruder. A method is mentioned.

Examples of the kneader include a single screw extruder, a twin screw kneader, a roll mixer, a Banbury mixer, and the like. Of these, a twin-screw kneading extruder is preferable from the viewpoint of workability and kneadability.

Next, the composite fiber in the present invention will be described.
The composite fiber in the present invention can be obtained by drying the polymer alloy and polyester comprising the polyester, polyolefin, and modified polyolefin by a conventional method and then performing normal melt spinning using a composite spinning apparatus. The composite fiber here refers to a composite (conjugate) fiber in which polymer alloy and polyester are separately melted and bonded in various shapes during spinning.

The spinning method is not particularly limited. For example, after winding an undrawn yarn at a low speed, a so-called conventional method in which the yarn is drawn in a drawing process, a direct spinning drawing method (spin draw method), or a part to be drawn at a high speed is not drawn A POY method for obtaining a yarn can be mentioned. It is preferable to employ the spin draw method and the POY method from the viewpoint of labor saving and low cost production.

The composite fiber in the present invention needs to have a fiber cross-sectional shape in which a polymer alloy component is disposed in the core and a polyester component is disposed in the sheath that completely covers the core. To completely cover the core means that the core is not exposed on the fiber surface. When the polymer alloy component is exposed on the surface, the polyolefin, which is a part of the island phase, is exposed, resulting in deterioration of spinnability. For this reason, by taking a shape in which the polymer alloy component is completely covered with the polyester component, it is possible to produce a polyester composite fiber without these defects.

The fiber cross-sectional shape of the composite fiber in the present invention is not particularly limited as long as it is a fiber cross-sectional shape in which a polymer alloy component is disposed in the core and a polyester component is disposed in the sheath that completely covers the core as described above. However, for example, a single-core core-sheath type as shown in FIG. 1A and a multi-core core-sheath type as shown in FIG.

As a ratio of the core portion and the sheath portion, the volume ratio is preferably 95: 5 to 20:80, more preferably 80:20 to 80:20 to 80:20 from the viewpoint of frictional melt resistance and yarn quality. The range is 30:70. When the core part is smaller than 20% by volume, the polyester in the sheath part becomes thick, and it is difficult to obtain frictional melt resistance, which is not preferable. Moreover, when a sheath part is smaller than 5 volume%, since fiber strength falls, it is unpreferable.

The polyester composite fiber thus obtained is preferably 22 to 267 dtex / 12 to 72 f in terms of fineness / number of filaments in consideration of the case where it is used in a product that requires frictional melt resistance. -168 dtex / 12-48f is more preferable.

In addition, the polyester composite fiber according to the present invention preferably has a strength of 3.0 cN / dtex or more in consideration of mechanical properties that can be used as a product. More preferably, it is 3.5 cN / dtex or more. The elongation is preferably 30% or more.

The false twisted yarn of the present invention can be obtained by false twisting the polyester composite fiber.

The false twisting method can be either a pin method or a friction method, but a friction method with good production efficiency is preferable.

Hereinafter, an example of a suitable manufacturing method for false twisting will be described.

For example, when falsely twisting a drawn yarn by a pin method, the yarn speed is preferably 50 to 200 m / min, the twist number is preferably 3000 to 4000 T / m, and the heater temperature is preferably 180 to 220 ° C.

When false twisting the POY yarn by a friction method, the yarn speed is preferably 700 to 900 m / min, the twist number is preferably 3000 to 4000 T / m, the draw ratio is 1.5 to 2 times, and the heater The temperature is preferably 180 to 220 ° C.

Moreover, in order to make the bulkiness and the expansion / contraction restoration rate good, a two-heater type is preferable.

In addition, since the composite fiber in this invention can be processed with the suitable heater temperature (for example, 180-220 degreeC) used for normal polyester single yarn, a thing with good bulkiness is easy to be obtained, and it is easy to handle. Also excellent. When the heater temperature is too low, the crimp is not sufficiently imparted. Conversely, when the temperature is excessively high, fusion between filaments is likely to occur, and tight spots (necking and untwisting) tend to occur.

尚、上記撚数の好適範囲は、一般的な繊度８４ｄｔｅｘから、上記式を用いて算出した。撚数が過度に少ない場合、捲縮が不良となり易く、過度に多い場合も二重撚り等が生じ易いため、撚数は、繊度に応じて、上記撚係数から算出した撚数の範囲となることが好ましい。 Moreover, as for the twist coefficient shown below, 26,500-34,900 are preferable.

In addition, the suitable range of the said twist number was computed using the said formula from general fineness 84dtex. If the number of twists is excessively small, crimping tends to be poor, and if it is excessively large, double twisting or the like is likely to occur, so the number of twists is in the range of the number of twists calculated from the above twist coefficient depending on the fineness. It is preferable.

The false twisted yarn of the present invention thus obtained has good stretchability and excellent bulkiness.

In consideration of the case where the false twisted yarn of the present invention is used in products that require frictional melt resistance, the fineness / filament number is preferably 22 to 267 dtex / 12 to 72 f, and preferably 50 to 168 dtex / 12-48f is more preferable.

The false twisted yarn of the present invention preferably has an expansion / contraction recovery rate of 20% or more, more preferably 25% or more, from the viewpoint of maintaining good process passability and abrasion resistance in the knitting and dyeing steps. is there.

The false twisted yarn of the present invention preferably has a residual torque of 30 T / m or more, more preferably 50 T / m or more, from the viewpoint of maintaining good process passability and abrasion resistance in the knitting and dyeing processes. It is.

The false twisted yarn of the present invention has a strength of 3.0 cN / dtex or more in terms of elongation, from the point of maintaining good processability in the weaving and knitting process, dyeing process, mechanical properties practical as a product, and abrasion resistance. 30% or more is preferable.

Such false twisted yarn of the present invention has good stretchability and excellent bulkiness.

The false twisted yarn of the present invention can be suitably used for a friction and melt resistant fabric.
In the case of producing a friction-melt resistant fabric using the false twisted yarn of the present invention, the type of the fabric is not particularly limited, and any of a woven fabric, a knitted fabric, a non-woven fabric and the like may be used. Moreover, you may use for the whole fabric and may use it for a part of friction surface only.

The polyester false twisted yarn of the present invention is suitably used as a material for sports clothing such as school sports clothing and volleyball, basketball and handball.

The present invention will be specifically described below with reference to examples. In addition, this invention is not limited to the Example described below. In addition, each evaluation item in an Example and a comparative example was measured with the following method.
(1) Intrinsic viscosity [η]
It calculated | required by the conventional method at 20 degreeC in the mixed solvent of phenol / tetrachloroethane and 6/4 (mass ratio).
(2) MFR (g / 10 min)
The measuring method followed JIS K 6922-2.
(3) Strength and elongation A tensile test using an autograph AGS made by Shimadzu Corporation was performed, and the breaking strength when the fiber broke under the conditions of measuring length: 200 mm and pulling speed: 200 mm / min was 5 for each. The average value was obtained and measured as the strength.
(4) Dyeing property After circular knitting using the obtained false twisted yarn and scouring, dye D / N BLUEACE 1.0% owf, acetic acid 0.2 ml / L, Ionette RP 1.0 g / L In the inside, it dye | stained for 60 minutes at 130 degreeC with bath ratio 1:20, and evaluated as (circle) (good dyeability) and x (poor dyeability) from visual observation.
(5) Friction melting resistance Circular knitting was performed using the obtained false twisted yarn, and a rotor type friction melting test was performed in accordance with JIS L1056 (Method B). The state of the fabric surface after pressing for 10 seconds was evaluated by the following three stages ○ (only scratched traces), Δ (partially melted traces), and × (samples were broken and had holes).
(6) Spinning operability When the yarn was spun for 24 hours, the yarn that did not break even once was marked with ◯, and the yarn with broken yarn marked with ×.
(7) False twist operability The operability when false twisting was performed was evaluated according to the following criteria.
○: No yarn breakage, no surging ×: Yarn breakage occurrence, other abnormalities (8) Expansion / contraction recovery rate Measured according to JIS L1013 8.12.
(9) The number of twists of 25 cm length was measured with a tester under a load of residual torque of 0.2 g / dex, and the obtained number of twists (T / 25 cm) was multiplied by 4 to obtain a residual torque (T / m). Was calculated.

[Example 1]
Using polyethylene terephthalate with intrinsic viscosity [η] of 0.64 and high density polyethylene (manufactured by Nippon Polyethylene) with MFR of 7.0 and density of 0.964, ethylene-glycidyl methacrylate copolymer as compatibilizer (Bonded by Sumitomo Chemical Co., Ltd., grade: 2C), each was blended in the prescribed amounts shown in Table 1 and dry blended, then supplied to a twin-screw kneading extruder, kneading temperature 270 ° C., screw rotation speed 250 rpm The polymer alloy used for a core part was obtained by melt-kneading under the conditions described above and cooling into pellets. On the other hand, polyethylene terephthalate having an intrinsic viscosity [η] of 0.64 was used as the sheath. Each polymer is dried and introduced into a compound spinning machine and melted with a volume ratio of polymer alloy and polyethylene terephthalate of 2: 1. Spinning is performed so that the polymer alloy is in the core of Fig. 1 (A) and polyethylene terephthalate is in the sheath. After extruding from the die and applying an oil agent by a usual method, a core-sheath type composite fiber (POY yarn) of 150 dtex / 24f was obtained by the POY method with a spinning speed of 4300 m / min. Using the obtained core-sheath type composite fiber, under the conditions of a heater temperature of 200 ° C., a yarn speed of 760 m / min, and a twist number of 3100 T / m, the yarn speed is 760 m / min while being drawn 1.785 times by the friction method. When false twisting was performed, false twisted yarns with good stretchability and bulkiness were obtained. The obtained false twisted yarn had a fineness of 84 dtex / 24f, an expansion / contraction recovery rate of 26%, a residual torque of 50 T / m or more in the Z direction, a strength of 3.3 cN / dtex, and an elongation of 30%. Furthermore, using this false twisted yarn, a circular knitting was produced, and the frictional melt resistance evaluation and the dyeability evaluation were performed. The results are shown in Table 1.

[Example 2]
In the same manner as in Example 1, it was extruded from a spinneret, an oil agent was applied by a usual method, and an unstretched yarn of a core-sheath type composite fiber was wound at a spinning speed of 1600 m / min. The obtained undrawn yarn was drawn 3.120 times to obtain 84 dtex / 24f core-sheath type composite fiber (drawn yarn). The obtained core-sheath type composite fiber was false twisted by a pin method at a yarn speed of 120 m / min, a heater temperature of 200 ° C., and a twist number of 3100 T / m. The obtained false twisted yarn had good stretchability and bulkiness. The false twisted yarn had a fineness of 84 dtex / 24f, an expansion / contraction recovery rate of 25%, a residual torque of 50 T / m or more in the Z direction, a strength of 3.3 cN / dtex, and an elongation of 30%. Further, a circular knitting was produced using the false twisted yarn, and the frictional melt resistance evaluation and the dyeability evaluation were performed. The results are shown in Table 1.

[Comparative Example 1]
A single fiber at 84 dtex / 24 f was obtained using polyethylene terephthalate having an intrinsic viscosity [η] of 0.64. The obtained fiber was false twisted in the same manner as in Example 1. Table 1 shows the physical properties and evaluation of the obtained false twisted yarn.

[Comparative Example 2]
84 dtex / in the same manner as in Example 1 except that MFR2.3 high density polyethylene is used as the core component, polyethylene terephthalate having an intrinsic viscosity [η] of 0.64 is used as the sheath component, and the volume ratio is 1: 3. 24f core-sheath type composite fiber was obtained. When the obtained core-sheath type composite fiber was false twisted in the same manner as in Example 1, cracks occurred in the sheath part, and exposure of high-density polyethylene as the core component was confirmed, and a large amount of white powder was generated. Although yarn breakage occurred frequently, a small amount of false twisted yarn was obtained. Table 1 shows the physical properties and evaluation results of the obtained false twisted yarn.

[Comparative Example 3]
Spinning was performed with a single component of the core polymer alloy obtained in Example 1 to obtain 84 dtex / 24f fibers. During spinning, high density polyethylene was exposed on a part of the surface, white powder was generated, and yarn breakage occurred frequently. When the obtained fiber was false twisted in the same manner as in Example 1, white powder was generated and yarn breakage occurred frequently, but a very small amount of false twisted yarn could be obtained. The evaluation results of the obtained false twisted yarn are shown in Table 1.

In the false twisted yarns obtained from Examples 1 and 2, core-sheath peeling did not occur in post-processes such as the spinning process, false twisting process, and dyeing. In addition, these false twisted yarns are excellent in stretchability and bulkiness, are excellent in frictional melt resistance, can be dyed without staining spots in the dyeing process, have good durability, and are excellent in stretchability and bulkiness. It was.
The false twisted yarn using the polyethylene terephthalate single fiber obtained from Comparative Example 1 is inferior in frictional melt resistance, and the core-sheath type in which the core obtained from Comparative Example 2 is polyethylene and the sheath is polyethylene terephthalate. The false twisted yarn made of the composite fiber was peeled off from the core and the sheath, had poor dyeability, and was inferior in frictional melt resistance as compared with the products of the examples. Further, in the fiber composed only of the polymer alloy obtained from Comparative Example 3, in the spinning process and false twisting process, white powder is generated and yarn breakage occurs frequently. It was bad.

a Core b Sheath

Claims (7)

A false twisted yarn using a composite fiber consisting of a core part and a sheath part that completely covers the core part, wherein the polymer of the core part is a polymer alloy composed of two or more thermoplastic polymers, It consists of polyester, polyolefin and compatibilizing agent. The above polymer alloy has a sea-island structure in which the sea phase is polyester and the island phase is polyolefin, and the polymer in the sheath is polyester. False twisted yarn for flexible fabrics. The false-twisting yarn for a friction-resistant and melt-resistant fabric according to claim 1, wherein the expansion / contraction recovery rate is 20% or more. The false twisted yarn for a friction-melt resistant fabric according to claim 1 or 2, wherein the polyolefin is low-density polyethylene, linear low-density polyethylene, or high-density polyethylene. The false twisted yarn for friction-melt resistant fabric according to any one of claims 1 to 3, wherein the mass ratio of the polyester and polyolefin of the core polymer is 95: 5-55: 45 mass%. Residual torque is 30 T / m or more, The false twisting yarn for friction-melt-resistant fabrics as described in any one of Claims 1-4 characterized by the above-mentioned. The false twisted yarn for friction-melt resistant fabric according to any one of claims 1 to 5, wherein the strength is 3.0 cN / dtex or more and the elongation is 30% or more. The core polymer is a polymer alloy composed of two or more thermoplastic polymers, and the polymer alloy comprises a polyester, a polyolefin and a compatibilizing agent. The polymer alloy is a sea island in which the sea phase is polyester and the island phase is polyolefin. 2. A false twisting process is performed using a composite fiber having a structure in which a core portion is not exposed on the fiber surface, under a heater temperature of 180 to 220 ° C. and a twist number of 3000 to 4000 T / m. The manufacturing method of the false twisted yarn for friction-resistant cloth as described in any one of -6.

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