JP6812674B2 - Main yarn of woven knitted fabric and polyamide core sheath type mixed yarn - Google Patents

Description

The present invention is a polyamide core-sheath type mixed fiber yarn suitable for obtaining a woven or knitted fabric having a high yarn length difference due to a heat shrinkage difference, a strong sliminess, a bulky bulge, and a peach skin touch. And the woven and knitted fabrics using it.

Conventionally, mixed yarns are produced by combining yarns having different yarn physical properties such as heat shrinkage characteristics, and by using them in woven and knitted fabrics, textile products with texture and functionality that cannot be obtained by a single yarn are manufactured. It can be done and is widely considered.

For example, it is possible to provide a fabric that is bulky and gives a peach skin touch feel due to the difference in heat shrinkage characteristics after being made into a fabric using polyethylene terephthalate yarns having different shrinkage characteristics, and has an appearance with less irritation. A possible composite mixed yarn and a method for producing the same have been proposed (see Patent Document 1).

In addition, the sheath yarns that make up the composite mixed yarn are made of polyamide yarns, and the core yarns are polyethylene terephthalate yarns that have high shrinkage characteristics. There has been proposed a highly shrinkable and bulky processed yarn capable of providing a fabric having high color development by using polyamide yarn. (See Patent Document 2.).

Japanese Unexamined Patent Publication No. 5-98529 Japanese Unexamined Patent Publication No. 6-240530

However, the composite mixed yarn made of polyethylene terephthalate yarns having different shrinkage characteristics proposed in Patent Document 1 above is said to give bulkiness and a peach skin touch feel due to the difference in shrinkage characteristics. However, polyethylene terephthalate yarns Since it is a composite mixed yarn made of stripes, it does not have a sufficient slimy feeling and is inferior in color development and abrasion resistance, so it is not suitable for fields that require durability and color sense such as sportswear, and it shrinks. Since the temperature at which the difference in characteristics appears is high, it was not possible to develop a sufficient difference in yarn length compared to the wet heat treatment.

Further, in the proposal of Patent Document 2, it is possible to provide a fabric having a soft and spun-touch texture due to the difference in heat shrinkage characteristics and high color development due to the use of polyamide yarn for the sheath yarn. However, since the sheath yarn is a polyamide yarn and the core yarn is a polyethylene terephthalate yarn, it is not possible to dye at the same time, and it is difficult to dye in the same color, so that there is a problem in color development.

An object of the present invention is to solve the above-mentioned problems, and to obtain a woven or knitted fabric having a high yarn length difference, which cannot be obtained by a woven or knitted fabric using a conventional polyamide mixed fiber yarn. It is an object of the present invention to provide a woven or knitted fabric having excellent texture and physical properties by mixing polyamide yarns having different shrinkage stresses and using them in a woven or knitted fabric to develop a shrinkage stress difference from a low temperature.

Therefore, as a result of the study, the present inventors treated the polyamide yarn having a high heat shrinkage stress and the polyamide yarn having a relatively low heat shrinkage stress by a mixed fiber entanglement method having substantially no loop. We have arrived at the present invention by finding that by using the obtained mixed warp yarn for a woven or knitted fabric, it is possible to impart a texture and functionality that cannot be obtained with a conventional polyamide mixed yarn. That is, in the present invention, weaving and knitting is performed using the original yarn of a specific polyamide core-sheath type mixed yarn, and the difference in shrinkage stress between the core yarn and the sheath yarn is used to obtain a high yarn length difference between the core yarn and the sheath yarn. It was found that when expressed, a woven or knitted fabric having a strong sliminess, a bulky, bulging, peach-skin-touch texture, and durability and color development due to a blend of polyamide multifilaments can be obtained.

The woven and knitted fabric of the present invention contains a polyamide multifilament core-sheath type mixed yarn in at least a part of the woven and knitted fabric, and the polyamide multifilament yarn A constituting the sheath yarn of the mixed yarn and the polyamide mulch constituting the core yarn. This is a woven or knitted fabric using a polyamide core-sheath type mixed yarn, wherein the filament yarn B has a yarn length difference of 10% or more, and the polyamide multifilament yarn A has substantially no loop.

According to a preferred embodiment of the present invention, in the above-mentioned woven and knitted fabric, the single yarn fineness of the polyamide multifilament yarn A is 1.4 dtex or less, and the single yarn fineness of the polyamide multifilament yarn B is 0.9 dtex or more and 3.0 dtex or less. is there.

According to a preferred embodiment of the present invention, in the woven and knitted fabric, the polyamide multifilament yarn A is a false twisted yarn.

The original yarn of the polyamide core-sheath type mixed yarn of the present invention has a yarn length difference of 5% or less between the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn. The difference in yarn length after treatment with hot water at 98 ° C. for 30 minutes is 15% or more.

According to a preferred embodiment of the present invention, in the original yarn of the polyamide core-sheath type mixed yarn, the polyamide multifilament yarn A has substantially no loop.

Further, the original yarn of the polyamide core-sheath type mixed yarn of the present invention has a hot water shrinkage rate of 15% or less of the polyamide multifilament yarn A constituting the sheath yarn, and the polyamide multifilament yarn B constituting the core yarn. Polyamide core sheath type in which the hot water shrinkage rate is 20% or more, the heat shrinkage stress is 0.15 cN / dtex or more, and the heat shrinkage stress of the yarn B at 60 ° C. is 0.05 cN / dtex or more higher than that of the yarn A. It is the original yarn of mixed fiber yarn.

According to a preferred embodiment of the present invention, in the original yarn of the polyamide core-sheath type mixed yarn, the polyamide multifilament yarn A has substantially no loop.

According to a preferred embodiment of the present invention, the original yarn of the polyamide core-sheath type mixed yarn has a difference in yarn length between the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn. It is 5% or less.

According to a preferred embodiment of the present invention, the original yarn of the previous polyamide core-sheath type mixed yarn is obtained by heating the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn at 98 ° C. The difference in yarn length after treatment with water for 30 minutes is 15% or more.

The woven or knitted fabric of the present invention has a strong sliminess, bulkiness, swelling, and peach skin touch texture, which was not found in conventional nylon woven and knitted fabrics.

In addition, the polyamide core-sheath type mixed yarn of the present invention effectively develops a difference in yarn length in the dyeing and finishing process of the fabric, and has a strong sliminess, which is not found in conventional nylon woven and knitted fabrics, and is bulky and bulging. It is possible to give a woven or knitted fabric having a skin-touch texture.

FIG. 1 is a conceptual diagram showing an example of a crunodal loop formed of Taslan mixed yarn. FIG. 2 is a conceptual diagram for explaining one aspect of a preferable manufacturing method of the polyamide core-sheath type mixed yarn of the present invention. FIG. 3 is a conceptual diagram for explaining one aspect of a preferable manufacturing method for false twisting the polyamide multifilament yarn B constituting the sheath yarn of the polyamide core-sheath type mixed yarn of the present invention.

The woven or knitted fabric of the present invention contains a polyamide core-sheath type mixed yarn in at least a part of the woven or knitted yarn, and the yarn lengths of the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn. The difference is 10% or more, and the polyamide multifilament yarn A has substantially no loops. When the difference in yarn length is 10% or more, the feeling of bulkiness and swelling when touching the woven or knitted fabric is excellent, and it is possible to fully realize these. A more preferable yarn length difference is 15% or more. The preferable upper limit is 40% from the viewpoint of deterioration of wear physical properties.

The difference in thread length has a great effect on the texture of woven and knitted fabrics. In order to impart a yarn length difference to the mixed yarns constituting the woven or knitted fabric, generally, in the blending process, a mixed yarn having a yarn length difference by increasing the feed ratio of the core yarn and the sheath yarn is used as the main yarn. Method, A mixed yarn in which yarns having shrinkage characteristics are arranged in the core yarn is used as the main yarn, and as a result of shrinking the core yarn in the weaving and knitting step and the post-processing step, the mixed yarns constituting the woven and knitted yarn have a difference in yarn length. The method of granting is known. In the former method, in order to give a difference in yarn length in the core-sheath type blending process, it is usual to increase the feed rate difference between the core yarn and the sheath yarn to perform the blending. Sagging occurs, and poor entanglement is likely to occur. Therefore, the feed rate of the core yarn and the sheath yarn is usually about 5% at the maximum, and even if ordinary polyamide fibers are combined and woven and knitted as a mixed fiber yarn, a sufficient yarn length difference does not appear. The latter method is used to develop a sufficient yarn length difference, but according to the conventional method, a highly shrinkable yarn made of another material such as polyester has to be used as the core yarn.

In the present invention, it has been found that it is possible to impart a yarn length difference in a preferable manner by arranging a yarn having a shrinkage characteristic in the core yarn.

In the present invention, substantially no loop means that the sheath yarn does not have a crunodal-like (teardrop-shaped) loop, so that the sheath yarn can be a mixed yarn that moves with a degree of freedom.

Such a core-sheath type mixed yarn having substantially no loop can be obtained by mixing by a entangled blending method using an interlaced nozzle. A core-sheath type mixed yarn mixed by a Taslan mixed fiber method using a turbulent nozzle usually forms a crunodal-shaped (teardrop-shaped) loop. It refers to a mixed yarn that does not have a crunodal-shaped (teardrop-shaped) loop as shown in FIG. 1 and in which the sheath yarn moves with a degree of freedom.

FIG. 1 is a conceptual diagram showing an example of a crunodal loop formed of a Taslan mixed yarn. The threads forming the sheath portion by the Taslan mixed fiber form a crunodal loop 1.

In the Taslan confounding method, the direction of travel of the yarn is suddenly changed at the outlet of the turbulent nozzle, and when the fluid slips through the side surface of the oversupplied and loosened yarn when it is taken out from this propulsion fluid, it is arbitrary for each yarn. A turning force is applied, and the generated torque causes the yarns to be entangled and entangled with each other in the vicinity, resulting in a mixed fiber yarn having a large number of knodal-shaped loops. The crunodal-shaped loop creates a crisp, span-like texture. The polyamide blended yarn, which is blended by blended fiber entanglement using an interlaced nozzle and has substantially no loop, has a strong slimy feeling because the sheath yarn moves with a degree of freedom, and expresses a bulging texture.

The polyamide core-sheath type mixed yarn contained in the woven and knitted fabric of the present invention will be described below.

In the polyamide core-sheath type mixed yarn, the single yarn fineness of the polyamide multifilament yarn A constituting the sheath yarn is preferably 0.15 dtex or more and 1.4 dtex or less, and the polyamide multifilament yarn B constituting the core yarn. The single yarn fineness of is preferably 0.9 dtex or more and 3.0 dtex or less.

When the single yarn fineness of the polyamide multifilament yarn A constituting the sheath yarn is less than 0.1 dtex, a microtouch fabric is obtained and a good texture can be obtained, but the single yarn fineness of the polyamide multifilament yarn B constituting the core yarn is obtained. The difference in fineness spreads, and there is a tendency for color differences to occur between the core yarn and the sheath yarn during dyeing. In addition, since the surface area of the sheath yarn is increased, the incident light is diffused and the color development property is likely to be lowered. When the single yarn fineness of the polyamide multifilament yarn A is higher than 1.4 dtex, the contact area when touched is reduced, and it becomes difficult to obtain a peach skin touch or a slimy feeling. A more preferable single yarn fineness of the polyamide multifilament yarn A is 0.35 dtex or more and 1.2 dtex or less.

When the single yarn fineness of the polyamide multifilament yarn B is less than 0.9 dtex, a soft fabric can be obtained, but the tension and elasticity of the core yarn are lost, it becomes difficult to feel the bulging texture, and the single yarn fineness is 3. When it is higher than 0 dtex, the tension and stiffness of the core yarn become stronger, and the texture tends to be hard. A more preferable single yarn fineness of the polyamide multifilament yarn B is 1.5 dtex or more and 2.5 dtex or less.

In the above-mentioned polyamide core-sheath type mixed yarn, the polyamide multifilament yarn A constituting the sheath yarn is preferably a false twist yarn. This is because the scabbard yarn is false-twisted to impart crimping, emphasize the bulkiness and peach skin touch, and obtain a more bulging fabric.

The original yarn of the polyamide core-sheath type mixed yarn preferably used for the above-mentioned woven and knitted fabric in the present invention will be described below.

One aspect of the original yarn of the polyamide core-sheath type mixed yarn of the present invention is that the yarn length difference between the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn is 5% or less. The difference in yarn length after treatment with hot water at 98 ° C. for 30 minutes is 15% or more.

Further, another aspect of the original yarn of the core-sheath type mixed yarn of the present invention is that the hot water shrinkage rate of the polyamide multifilament yarn A constituting the sheath yarn is 15% or less, and the polyamide multifilament yarn constituting the core yarn. Polyene which has a hot water shrinkage rate of 20% or more and a heat shrinkage stress of 0.15 cN / dtex or more, and a heat shrinkage stress of yarn B at 60 ° C. is 0.05 cN / dtex or more higher than that of yarn A. It is the original yarn of core-sheath type mixed yarn.

The above-mentioned new yarns of the polyamide core-sheath type mixed fiber all cause a difference in yarn length due to the difference in heat shrinkage between the polyamide multifilament yarn A and the polyamide multifilament yarn B, and a weave obtained by utilizing this property. It provides a suitable yarn length difference for each yarn in the polyamide core-sheath type mixed yarn contained in the knitted fabric, and can give a woven or knitted fabric having a strong slimy, bulky, bulging and peach-skin touch texture.

Both of the above aspects will be described in detail below. In the present invention, it is preferable that the difference in yarn length between the polyamide multifilament yarn A constituting the sheath yarn of the original yarn of the polyamide core-sheath type mixed yarn and the polyamide yarn B constituting the core yarn is 5% or less. .. By setting the yarn length difference between the polyamide multifilament yarn A and the polyamide yarn B constituting the core yarn to 5% or less, the sheath yarn does not have excessive slack during a melee such as an air mixed fiber, and entanglement failure occurs. It is less likely to occur, can be of good quality, and is excellent in productivity. A more preferable yarn length difference is 3% or less.

The above-mentioned polyamide core-sheath type mixed yarn has a difference in yarn length after treating the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn with hot water at 98 ° C. for 30 minutes. It is preferably 15% or more. When the yarn length difference is 15% or more, when a woven or knitted fabric is created and the constituent yarns are restrained, a sufficient yarn length difference can be obtained through the dyeing and finishing processes, and the swelling is excellent. A woven or knitted fabric can be obtained. A more preferable yarn length difference is 20% or more. The upper limit is preferably 50% from the viewpoint of deterioration of the frictional physical properties when the woven or knitted fabric is formed.

Further, in the original yarn of the polyamide core-sheath type mixed yarn of the present invention, the hot water shrinkage rate of the polyamide multifilament yarn A is usually 15% or less, and the hot water shrinkage ratio of the polyamide multifilament yarn B is 20% or more. It is preferable that the heat shrinkage stress is 0.15 cN / dtex or more, and the heat shrinkage stress of the polyamide multifilament yarn B at 60 ° C. is 0.05 cN / dtex or more higher than that of the polyamide multifilament yarn A. When the hot water shrinkage rate of the polyamide multifilament yarn A is higher than 15%, the difference in the heat shrinkage rate from the polyamide multifilament yarn B decreases, and it becomes difficult to obtain a sufficient yarn length difference. The more preferable hot water shrinkage rate of the polyamide multifilament yarn A is 10% or less. The lower limit is preferably 0% or more from the viewpoint of deterioration of wearable physical properties due to the occurrence of a difference in yarn length. Further, when the hot water shrinkage rate of the polyamide multifilament yarn B is less than 20%, a sufficient difference in yarn length cannot be obtained and the sheath yarn cannot be raised on the surface of the fabric. A more preferable hot water shrinkage rate of the polyamide multifilament yarn B is 25% or more. The upper limit is preferably 40% from the viewpoint of deterioration of wearable physical properties due to the occurrence of a difference in yarn length. If the heat shrinkage stress is less than 0.15 cN / dtex, the stress of the yarns generated during shrinkage cannot reach more than the binding force between the yarns forming the fabric, and sufficient shrinkage may not be obtained. Knitted fabrics with low binding force are not easily affected by heat shrinkage stress, but woven fabrics with high binding force can obtain sufficient shrinkage when the heat shrinkage stress is 0.15 cN / dtex or more. A more preferable heat shrinkage stress is 0.20 cN / dtex or more. The upper limit is preferably 0.40 cN / dtex from the viewpoint of deterioration of wearable physical properties due to the occurrence of a difference in yarn length. Further, since the heat shrinkage stress of the yarn B at 60 ° C. is higher than that of the yarn A by 0.05 cN / dtex or more, a sufficient shrinkage difference is generated in the hot water in the refining step, and a sufficient yarn length difference can be obtained. It is more preferable that the heat shrinkage stress of the polyamide multifilament yarn B at 60 ° C. is 0.08 cN / dtex or more higher than that of the polyamide multifilament yarn A. The upper limit is preferably 0.20 cN / dtex from the viewpoint of deterioration of wearable physical properties due to the occurrence of a difference in yarn length.

Further, it is preferable that the polyamide multifilament yarn A constituting the sheath yarn in the main yarn of the polyamide core-sheath type mixed yarn has substantially no loop.

In the present invention, the main yarn of the polyamide core-sheath type mixed yarn is preferably a false twisted yarn in which the polyamide multifilament yarn A constituting the sheath yarn is used. This is because the scabbard yarn is false-twisted to impart crimping, emphasize the bulkiness and peach skin touch, and obtain a more bulging fabric.

In the woven and knitted fabric of the present invention, the core yarn and the sheath yarn forming the mixed yarn are formed of polyamide. Therefore, it is excellent in abrasion resistance and softness, and since it is a woven or knitted fabric having a high yarn length difference, it is bulky and excellent in swelling. As a result, the woven and knitted fabric of the present invention can be used for all kinds of clothing such as sports / outdoor wear with high exercise conditions, casual wear such as bottoms, downs, jackets and cardigans, pantyhose and innerwear.

The polyamide multifilament yarn A used in the present invention is not particularly limited as long as it is a polyamide multifilament, and examples thereof include nylon 6, nylon 66, nylon 56, nylon 610, nylon 46, and nylon 12.

As the polyamide multifilament yarn B used in the present invention, one that can cause heat shrinkage due to the heat history after mixing and cause a difference in yarn length from the yarn A is preferably used. Specifically, fibers made of crystalline polyamide and amorphous polyamide are preferably used.

Crystalline polyamide is a polyamide that forms crystals and has a melting point, and is a polymer in which so-called hydrocarbon groups are linked to the main chain via an amide bond, and is a polypolyamide, polyhexamethylene adipamide, or polyhexamethylene sebaca. Examples thereof include amides, polytetramethylene adipamides, condensation polymerized polyamides of 1,4-cyclohexanebis (methylamine) and linear aliphatic dicarboxylic acids, and copolymers thereof or mixtures thereof. However, it is preferable to use a homopolyamide from the viewpoint of easy reproduction of a uniform system and stable function expression.

The crystalline polyamide is a high molecular weight compound composed of diamines and dibasic acids, and specific diamines include tetramethylenediamine, hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2. , 4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, bis- (4,4'-aminocyclohexyl) methane, metaxylylenediamine and the like. Dibasic acids include glutaric acid, pimelli acid, adipic acid, suberic acid, azelaic acid, sebacic acid, undecandic acid, dodecadio acid, hexadecadio acid, hexadecendioic acid, eicosandioic acid, diglycolic acid, 2, Examples thereof include 2,4-trimethyladiponic acid, xylylene dicarboxylic acid and 1,4-cyclohexanedicarboxylic acid. The crystalline polyamide used for the highly shrinkable polyamide fiber of the present invention may be any, but polycapramide and polyhexamethylene adipamide are preferable in terms of both manufacturing cost and maintenance of fiber strength.

The non-crystalline polyamide in the polyamide multifilament filament B used in the present invention is a polyamide that does not form crystals and does not have a melting point. For example, a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine, isophthalic acid. / Telephthalic acid / Hexamethylenediamine / Bis (3-methyl-4-aminocyclohexyl) methane polycondensate, Isophthalic acid / 2,2,4-trimethylhexamethylenediamine / 2,2,4-trimethylhexamethylenediamine Polycondensate, terephthalic acid / 2,2,4-trimethylhexamethylenediamine / 2,2,4-trimethylhexamethylenediamine polycondensate, isophthalic acid / terephthalic acid / 2,2,4-trimethylhexamethylenediamine / Polycondensate of 2,2,4-trimethylhexamethylenediamine, polycondensate of isophthalic acid / bis (3-methyl-4-aminocyclohexyl) methane / ω-laurolactam, terephthalic acid / bis (3-methyl-4) -Aminocyclohexyl) There are polycondensates of methane / ω-laurolactam. In addition, the benzene ring of the terephthalic acid component and / or the isophthalic acid component constituting these polycondensates is substituted with an alkyl group or a halogen atom. Further, two or more kinds of these amorphous polyamides may be used in combination. The amorphous polyamide used for the highly shrinkable polyamide fiber of the present invention is preferably a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine from the viewpoint of having a high glass transition temperature (Tg).

The weight ratio of the crystalline polyamide to the amorphous polyamide in the polyamide multifilament filament B used in the present invention is crystalline polyamide / amorphous polyamide = 90/10 to 50/50. The weight ratio referred to here is the peak area (A) of the signal (usually around 3 ppm) derived from the hydrogen at the α-position of the carboxyl group forming the amide bond by measuring the proton NMR of the polyamide multifilament filament B. Obtain the repetition ratio of crystalline polyamide and amorphous polyamide from the peak area (B) of the signal derived from the aromatic hydrocarbon (usually around 7ppm) (A = number of repetitions of crystalline polyamide x 2 + repetition of amorphous polyamide). Number x 2, B = number of repetitions of amorphous polyamide x 4). Further, the same polyamide multifilament yarn B as described above is subjected to mass spectrometry, and the mass number of the repeating unit of the polyamide is measured. The weight ratio is calculated from the product of the obtained repeating ratio and the mass number of the repeating unit of each polyamide.

The polyamide multifilament yarn B used in the present invention is particularly preferably a compatible system in which crystalline polyamide and amorphous polyamide are compatible with each other. Judgment of compatible system and incompatible system is made when the phase separation structure of the sea island having a dispersed phase with a diameter of 10 nm or more is observed in the TEM observation result of 3000 times, the incompatible system and the sea island having a dispersed phase with a diameter of 10 nm or more. When the phase separation structure of was not observed, it was judged to be a compatible system. In the compatible system, when the fiber structure is formed, the amorphous portion of the crystalline polyamide is entangled with the amorphous polyamide. The amorphous portion of the crystalline polyamide having a low glass transition temperature Tg is entangled with the amorphous polyamide having a high Tg, which plays a role in preventing the structure of the crystalline polyamide from changing from a low temperature (normal temperature). As a result, a high strain zone can be formed in the amorphous portion of the crystalline polyamide, and the desired boiling water shrinkage rate and heat shrinkage stress can be more effectively expressed.

In view of this point, a polyamide selected from polycapramide and polyhexamethylene adipamide is used as the polyamide constituting the thread A, and isophthalic acid / terephthalic acid / hexamethylenediamine is used as the polyamide constituting the thread B. It is particularly preferable to use the polycondensate of.

A method for producing the polyamide multifilament yarn B used in the present invention will be described.

When mixing and melting crystalline polyamide and amorphous polyamide, a melt-kneading method using a pressure melter, a uniaxial extruder or a twin-screw extruder can be mentioned. The pressure melter method or the extruder method can be mentioned. In order to form a compatible system with crystalline polyamide and amorphous polyamide and obtain high thermal shrinkage stress, it is preferable to use a uniaxial extruder. When a pressure melter is used, it is not uniformly mixed, so that a phase-separated structure of sea islands is formed and a high heat shrinkage stress cannot be obtained. Further, when a biaxial extruder is used, the crystalline polyamide and the amorphous polyamide react too much, the high strain zone formed in the amorphous part of the crystalline polyamide is reduced, and a high thermal shrinkage stress is obtained. I can't. The mixed polymer of crystalline polyamide and amorphous polyamide that has flowed into the spinning pack is discharged from a known spinneret. Further, the melting temperature and the spinning temperature (so-called heat retention temperature around the polymer pipe and the spinning pack) are preferably the melting point + 20 ° C. to the melting point + 60 ° C. of the polyamide.

Regarding the manufacturing method process of the polyamide multifilament yarn B used in the present invention, a method of continuously performing a spinning-drawing step (direct spinning and drawing method) and a method of winding an undrawn yarn once and then drawing it (two-step method). ) Or a method in which the spinning process is substantially omitted by setting the spinning speed to 3000 m / min or more (high-speed spinning method), etc., can be manufactured by any method, but in terms of high efficiency production and manufacturing cost. A one-step method of direct spinning and drawing method and high-speed spinning method is preferable.

The production of melt spinning by the direct spinning drawing method will be illustrated.

The polyamide yarn discharged from the spinneret is cooled and solidified in the same manner as normal melt spinning, and after refueling, it is picked up by the first godet roller at 500 to 4000 m / min, and the first godet roller and the second got are used. After stretching 1.0 to 4.0 times between the dead rollers, it is wound into a package at 2000 m / min or more, preferably 3000 to 4500 m / min.

At this time, by appropriately designing the ratio of the peripheral speed between the first godet roller and the second godet roller (drawing ratio) and the winding speed (winder speed), the target polyamide yarn is strongly stretched. It becomes possible to obtain the degree.

Further, by performing thermal stretching using the first godet roller as a heating roller, the fluidity of the polymer is increased, a high strain zone is generated in the amorphous portion of the crystalline polyamide, and the thermal shrinkage stress is improved. The heat stretching temperature is preferably 130 to 160 ° C, more preferably 140 to 160 ° C.

Further, by applying heat setting using the second Godet roller as a heating roller, the heat shrinkage stress of the yarn can be appropriately designed. The heat setting temperature is preferably 130 to 180 ° C, more preferably 150 to 170 ° C.

It is also possible to entangle using a known entanglement device in the process up to winding. If necessary, it is possible to increase the number of entanglements by adding entanglements multiple times.
Furthermore, it is also possible to add an additional oil agent immediately before winding.

Both the polyamide multifilament yarn A and the polyamide multifilament yarn B used for the original yarn preferably have a tensile strength of 3.5 cN / dtex or more. By setting the tensile strength to 3.5 cN / dtex or more, it becomes possible to adapt to all clothing applications. The tensile strength is more preferably 3.5 cN / dtex or more and 5.5 cN / dtex.

Both the polyamide multifilament yarn A and the polyamide multifilament yarn B used for the original yarn preferably have an elongation of 25% or more. If the elongation is less than 25%, problems are likely to occur in the process passability in higher-order processing processes such as false twisting, composite, weaving and knitting. The elongation is more preferably 30% or more and 65% or less. When the elongation exceeds 65%, the yarn after spinning absorbs moisture in the air and swells, so that winding becomes impossible.

The total fineness of the polyamide multifilament yarn A and the polyamide multifilament yarn B used for the main yarn used in the present invention is preferably 300 dtex or less because they are widely used from sports / outdoor wear to casual wear and innerwear, respectively. , 200 dtex or less is more preferable.

Further, the single yarn fineness of the polyamide multifilament yarn A used for the main yarn is preferably 1.4 dtex or less, and preferably 1.2 dtex or less. The preferred lower limit is 0.2 dtex. Further, the single yarn fineness of the polyamide multifilament yarn B is preferably 0.9 dtex or more and 3.0 dtex or less, and more preferably 1.1 dtex or more and 2.5 dtex or less.

The cross-sectional shapes of the polyamide multifilament yarn A and the polyamide multifilament yarn B used for the original yarn are not particularly limited, but can be any shape depending on the application and the like, and are circular, triangular, flat, and Y. Shape and star shape are preferable.

The false twist method of the polyamide multifilament yarn A is not particularly limited, and a spindle type, a friction type such as a disc, or the like can be used. The draw ratio is preferably 1.05 times or more and 1.30 times or less. Stretching Magnification If the stretching ratio is less than 1.05 times, untwisting occurs and the quality deteriorates, and if it exceeds 1.30 times, yarn breakage and fluff are likely to occur. Further, in the case of the friction type, the D / Y (surface speed / yarn speed of the twister) is preferably set so that the K value (untwisting tension / twisting tension) is in the range of 0.8 to 1.3. .. If the K value is less than 0.8, constriction and untwisting occur and the yarn shape deteriorates, and if it exceeds 1.3, fluff occurs and the operability deteriorates, which is not preferable. The false twist heater temperature is preferably 170 ° C. or higher and 215 ° C. or lower. When the false twist heater temperature is less than 170 ° C., the settability is lowered, so that the crimping property is weak and it is difficult to obtain a false twist processed yarn having a bulge. On the other hand, if the temperature exceeds 215 ° C., the polymer is softened, constriction and untwisting occur, and the yarn appearance deteriorates. Considering the productivity and the crimped state, the range of the twist coefficient for determining the number of false twists is preferably 20000 or more and 35000 or less. Further, heat may be set by a heater after false twisting for the purpose of suppressing the heat shrinkage rate and the degree of entanglement at the time of blending.

As the blending method of the polyamide multifilament yarn A and the polyamide multifilament yarn B, it is preferable to use the entangled blending method using an interlaced nozzle having substantially no loop. The type and structure of the interlaced nozzle, entanglement conditions, etc. are not particularly limited.

The feed ratio difference between the polyamide multifilament yarn A and the polyamide multifilament yarn B is preferably 5% or less, more preferably 3% or less.

The degree of entanglement of the mixed fiber yarn is preferably 10 or more and 100 or less, and more preferably 20 or more and 70 or less per 1 m.

The spread length of the mixed fiber yarn is preferably 0.1 cm or more and 10 cm or less, and more preferably 0.3 cm or more and 5 cm or less.

A woven or knitted product can be obtained by knitting and knitting using the raw yarn of the above-mentioned polyamide core-sheath type mixed yarn. The structure constituting such a woven or knitted fabric is not particularly limited. In the case of a woven fabric, the structure may be a plain structure, a twill structure, a red structure, or a modified structure thereof, depending on the intended use. In the case of knitted fabrics, the texture may be round knitted fabric, interlocked texture, smooth texture, warp knitted fabric half structure, satin structure, jacquard structure or their modified structure, depending on the intended use. I do not care.

The woven and knitted fabric using the polyamide core-sheath type mixed yarn of the present invention can be subjected to physical processing such as raising and calendar processing, and functional processing such as water repellent processing, water absorption processing and antistatic processing.

[Difference in yarn length of mixed yarns constituting woven and knitted fabrics]
Twenty mixed yarns are collected at regular intervals (5 cm collected on a woven or knitted base) from the warp or weft direction of the woven or knitted fabric that has undergone dyeing and finishing. The collected mixed yarn is disassembled and divided into a single yarn of the polyamide multifilament yarn A constituting the sheath yarn and a single yarn of the polyamide multifilament yarn B constituting the core yarn. The disassembled yarn is placed on a glass plate, a small amount of glycerin is dropped, and the crimp formed from the woven or knitted structure is stretched to measure the yarn length. The average yarn length of 20 single yarns of the polyamide multifilament yarn A is L1, the average yarn length of 20 single yarns of the polyamide multifilament yarn B is L2, and the yarn length difference is calculated from the following formula.
Thread length difference (%) = [(L1-L2) / L2] x 100

[Difference in yarn length of the original yarn of the mixed yarn]
From a multifilament drum wound around a paper tube, 20 yarns of mixed yarns at regular intervals (5 cm based on the yarn base) are collected. The collected mixed yarn is disassembled and divided into a single yarn of the polyamide multifilament yarn A constituting the sheath yarn and a single yarn of the polyamide multifilament yarn B constituting the core yarn. The disassembled yarn is placed on a glass plate, a small amount of glycerin is dropped, and the yarn is stretched so as not to be bent, and the yarn length is measured. The average yarn length of 20 single yarns of the polyamide multifilament yarn A is L3, the average yarn length of 20 single yarns of the polyamide multifilament yarn B is L4, and the yarn length difference is calculated from the following formula.
Thread length difference (%) = [(L3-L4) / L4] x 100

[Difference in yarn length of the original yarn of the mixed yarn (heat treatment)]
The mixed yarn is wound 10 times with a measuring machine (circumference 1.125 m) into a ring shape, treated with hot water at 98 ° C for 30 minutes without applying a load, and at regular intervals (original yarn) from the treated mixed yarn. Collect 20 mixed yarns (5 cm at the base). The collected mixed yarn is disassembled and divided into a single yarn of the polyamide multifilament yarn A constituting the sheath yarn and a single yarn of the polyamide multifilament yarn B constituting the core yarn. The disassembled yarn is placed on a glass plate, a small amount of glycerin is dropped, and the yarn is stretched so as not to be bent, and the yarn length is measured. The average yarn length of 20 single yarns of the polyamide multifilament yarn A is L5, the average yarn length of 20 single yarns of the polyamide multifilament yarn B is L6, and the yarn length difference is calculated from the following formula.
Thread length difference (%) = [(L5-L6) / L6] x 100

[Single yarn fineness and total fineness of mixed yarns that make up woven and knitted fabrics]
The cross section of the woven or knitted fabric that has undergone dyeing and finishing in the warp or weft direction is observed with a scanning electron microscope S-3400N (manufactured by Hitachi, Ltd.), and the polyamide multifilament yarns constituting the sheath yarn of the mixed fiber yarn are observed. For each single yarn in the polyamide multifilament yarn B constituting the single yarn in A and the core yarn, the fiber diameter is measured at 10 points, and the average fiber diameter of the 10 points is defined as μ. Let the fiber specific gravity be ρ, and calculate the single yarn fineness from the following formula. Next, the number of single yarns H of the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn are counted, and the total fineness is calculated from the following formula.
Single yarn fineness (dtex) = ρμ ^{2 /} 141.6
Total fineness (dtex) = single yarn fineness (dtex) x H

[Thinness of thread]
The thread is wound 80 times with a measuring machine (circumference 1.125 m) into a ring shape, and the weight is measured to the fourth decimal place with a balance. This operation is repeated 10 times, and the fineness of the string is calculated from the following formula with the average value of the weights of 10 times as P.
Thread fineness (dtex) = P × 100 × 1.11

[Single thread fineness]
One multifilament at regular intervals is collected from a multifilament drum wound around a paper tube. The number of filaments Q constituting the multifilament is measured using a decomposition needle, and the single yarn fineness of the yarn is calculated from the following formula.
Single yarn fineness (dtex) = Total fineness of yarn (dtex) / Q

[Hot water shrinkage rate]
The yarn was wound 10 times with a measuring machine (circumference 1.125 m) to form a ring shape, a load of 1/30 g per 1 d was applied to determine the length X, and then the yarn was immersed in boiling water in a free state for 30 minutes. After that, it is naturally dried, and a load of 1/30 g per 1d is applied again to obtain the length Y, which is calculated by the following formula.
Hot water shrinkage rate (%) = [(XY) / X] × 100

[Heat shrinkage stress]
Using a KE-2 type heat shrink stress measuring machine manufactured by Kanebo Engineering Co., Ltd., the fiber threads to be measured are tied into a loop with a circumference of 10 cm, an initial load of 1/30 g of the fineness of the threads is applied, and the temperature rise rate is 100 ° C. The peak stress value of the obtained thermal stress curve was measured at / min and divided by the total fineness of the measured fibers to obtain the thermal shrinkage stress. Further, the stress value at a temperature of 60 ° C. was calculated from the obtained thermal stress curve and divided by the total fineness of the fibers to obtain the heat shrinkage stress at a temperature of 60 ° C.

[Observation of sheath thread morphology]
Observe the side surface and cross-sectional morphology of the sheath yarn of the polyamide core-sheath type mixed yarn that constitutes the woven and knitted fabric after dyeing and finishing with a scanning electron microscope S-3400N (manufactured by Hitachi, Ltd.). A sheath yarn having a polygonal cross-sectional shape and a crimped side surface shape (that is, a yarn having a shape change due to false twisting was observed and having a shape change) was used as a false twisted yarn.

[Relative viscosity]
0.25 g of the sample was dissolved in 25 ml of sulfuric acid having a concentration of 98% by mass so as to be 1 g / 100 ml, and the flow time T1 at 25 ° C. was measured using an Ostwald viscometer. Subsequently, the flow time T2 of sulfuric acid having a concentration of 98% by mass was measured. The sulfuric acid relative viscosity ηr is calculated from the values of T1 and T2 by the following formula.
Sulfuric acid relative viscosity ηr = T1 / T2

[Fabric surface feeling]
The surface texture of the fabric was visually evaluated by 10 experts by the following two-step determination method. ○ was passed.
◯: Uniform surface feeling without dyeing difference ×: Heather tone, non-uniform surface feeling with dyeing difference

[Texture evaluation]
Each evaluation of bulkiness, swelling and peach touch was evaluated by the following three-step judgment method by 10 experts. ◎ and ○ were passed.
Bulkiness and bulge ◎: Feel lightness, softness and moderate repulsion.
◯: Feels light against the thickness of the woven or knitted fabric, and feels moderate repulsion.
Δ: Feel the weight with respect to the thickness of the woven or knitted fabric, and feel the hardness.
×: Feel the weight, and feel the hardness and poor return when touched.
Peach touch ◎: Feel the strength of slime that sticks to your hands.
○: I feel that there is slime.
Δ: I feel that there is slime.
×: There is no slime.

[Example 1]
Polyamide 66 drawn yarn (56dtex-98 filament, single yarn fineness 0.57dtex) having a hot water shrinkage rate of 13.2% was formed into filament A, and polycaprolactam (N6) (relative viscosity ηr: 2.62) as crystalline polyamide. , Melting point 222 ° C.) and a polycondensate of isophthalic acid (I) / terephthalic acid (T) / hexamethylenediamine as a non-crystalline polyamide with an isophthalic acid / terephthalic acid copolymerization ratio of 7/3 ( Relative viscosity ηr: 2.10) was melt-kneaded at 265 ° C. using a uniaxial extruder with a weight ratio of crystalline polyamide / non-crystalline polyamide of 70/30, and spinning with 36-hole and round-hole discharge holes. After melt-discharging (spinning temperature: 265 ° C.) using a mouthpiece, melt-discharging, the threads are cooled, refueled, and entangled, and then taken up with a 1500 m / min first godder roller (stretching temperature: 150 ° C.), followed by Polyamide drawn yarn having a hot water shrinkage rate of 35.0% and a heat shrinkage stress of 0.25 cN / dtex, which was stretched 2.4 times, heat-fixed at 165 ° C., and spun at a winding speed of 3500 m / min. 56 dtex-36 filament, single thread fineness 1.56 dtex) is set as filament B, and the filament A and filament B are entangled and mixed under the conditions shown in Table 1 according to the manufacturing process of FIG. 2, and a polyamide core sheath type mixed fiber is applied. The original yarn of the yarn was obtained. The difference in yarn length after treating the original yarn of the obtained mixed yarn with hot water at 98 ° C. for 30 minutes was 25.8%.

FIG. 2 is a conceptual diagram showing an example of a preferable manufacturing method of the polyamide core-sheath type mixed yarn of the present invention.

First, the polyamide drawn yarn 21 of the yarn A passes through the guide 22 and is sent out by the first feed roller 23, and the polyamide drawn yarn 24 of the yarn B passes through the guide 25 and is sent out by the second feed roller 26 and is entangled. After being supplied to the nozzle 27 and subjected to the mixed fiber entanglement treatment, it is drawn out as a polyamide core-sheath type mixed fiber 29 by the delivery roller 28 and wound by the take-up roller 210.

Using the obtained mixed fiber yarns as warp yarns and weft yarns, a 1/3 twill woven fabric was prepared with a warp density of 100 yarns / 2.54 cm, a weft density of 115 yarns / 2.54 cm, and a cover factor of 2160. Then, the obtained twill fabric was subjected to a liquid flow relaxing treatment according to a conventional method, and then dried and subjected to an intermediate set. The intermediate set conditions were carried out at a temperature of 170 ° C. Then, the obtained twill woven fabric was dyed with the disperse dye Navy Blue SGL at a temperature of 100 ° C. for 30 minutes, and a finishing set was applied according to a conventional method. The finishing set conditions were carried out at a temperature of 160 ° C. The difference in yarn length of the mixed yarns decomposed from the obtained twill fabric was 20.2%, the fineness of the yarn A was 56.4 dtex, and the fineness of the single yarn was 0.58 dtex. The fineness of the filament B was 57.5 dtex, and the fineness of the single yarn was 1.60 dtex. The obtained twill woven fabric has a uniform surface feeling with no color difference, and the threads A constituting the sheath yarn are raised on the surface due to the difference in yarn length, and a bulky, bulging texture with a peach skin touch can be obtained. It was.

[Example 2]
Polyamide 66 semi-drawn yarn (44 dtex-68 filament, single yarn fineness 0.65 dtex) having a hot water shrinkage rate of 12.3% was used as thread A, and polycaprolactam (N6) (relative viscosity ηr: 2) was used as the crystalline polyamide. .62, melting point 222 ° C.) and a polycondensate of isophthalic acid (I) / terephthalic acid (T) / hexamethylenediamine as a non-crystalline polyamide with an isophthalic acid / terephthalic acid copolymerization ratio of 7/3. The coalescence (relative viscosity ηr: 2.10) was melt-kneaded at 265 ° C. using a uniaxial extruder with a weight ratio of crystalline polyamide / non-crystalline polyamide of 70/30, and 20-hole and round-hole discharge holes were formed. After melt-discharging (spinning temperature: 265 ° C.) and melt-discharging using the spun cap, the threads are cooled, refueled, entangled, and then taken up by a first godder roller (drawing temperature: 150 ° C.) of 1500 m / min. Subsequently, it was stretched 2.2 times, then heat-fixed at 165 ° C., and spun at a winding speed of 3500 m / min. Polyamide stretching having a hot water shrinkage rate of 32.0% and a heat shrinkage stress of 0.24 cN / dtex. Using the yarn (22 dtex-20 filament, single yarn fineness 1.10 dtex) as filament B, the yarn A is false-twisted under the conditions shown in Table 1 according to the manufacturing process of FIG. 3, and the false-twisted yarn (37 dtex-68 filament, single yarn) is false-twisted. A fineness of 0.54 dtex) was prepared, and the filament A and the filament B were subjected to an entanglement blending process to obtain a source yarn of a polyamide core-sheath type blended yarn. The difference in yarn length after treating the original yarn of the obtained mixed yarn with hot water at 98 ° C. for 30 minutes was 27.1%.

FIG. 3 is a conceptual diagram for explaining one aspect of a preferable manufacturing method for false twisting the polyamide multifilament yarn B constituting the sheath yarn of the polyamide core-sheath type mixed yarn of the present invention.

First, the polyamide semi-drawn yarn 31 passes through the guide 32 and is fed out by the first feed roller 33, and then the false twist heater 34 between the first feed roller 33 and the first delivery roller 37, the cooling plate 35, False twisting is performed with the twister 36 to form yarn A. On the other hand, the polyamide drawn yarn 38 of the yarn B passes through the guide 39, is sent out by the second feed roller 310, is supplied to the entanglement nozzle 311 together with the yarn A, is subjected to the entanglement blending treatment, and then the second deli. It is drawn out as a polyamide core-sheath type mixed yarn 313 by a beli roller 312 and wound up by a take-up roller 314.

Using the obtained mixed fiber yarns as warp yarns and weft yarns, a plain woven fabric was prepared with a warp density of 158 yarns / 2.54 cm, a weft density of 109 yarns / 2.54 cm, and a cover factor of 1947. The obtained plain woven fabric was subjected to a processing step under the same conditions as in Example 1, and its physical properties were evaluated by the same method as in Example 1. The difference in yarn length of the mixed yarn is 13.5%, the fineness of the yarn A is 44.8 dtex, the fineness of the filament B is 23.7 dtex, the cross-sectional shape of the sheath yarn is polygonal, and the side shape is It was a false twisted yarn having crimp. The obtained plain woven fabric has a uniform surface feeling with no color difference, and on the surface, threads A having fine crimps are raised by false twisting, and the texture is bulky, bulging, and has a peach skin touch. was gotten.

[Comparative Example 1]
A polyamide 66 drawn yarn (56 dtex-98 filament, single yarn fineness 0.57 dtex) having a hot water shrinkage rate of 13.2% is used as thread A, and the hot water shrinkage rate is 13.0% and the hot water shrinkage stress is 0. Using a polyamide 6 drawn yarn (56 dtex-17 filament, single yarn fineness 3.29 dtex) of 13 cN / dtex as yarn B, the yarn A and the yarn B are entangled and mixed in accordance with the manufacturing process of FIG. Processing was performed to obtain a source yarn of a polyamide core-sheath type mixed yarn. The difference in yarn length after treating the original yarn of the obtained mixed yarn with hot water at 98 ° C. for 30 minutes was 12.8%.

A woven fabric was prepared from the obtained mixed fiber yarn with the same design as in Example 1, and the physical properties were evaluated by the same method as in Example 1 through a processing step under the same conditions. The difference in yarn length of the mixed yarn was 8.6%, the fineness of the yarn A was 56.3 dtex, the fineness of the single yarn was 0.57 dtex, and the fineness of the filament B was 56.3 dtex and the fineness of the single yarn was 3.31 dtex. The obtained twill woven fabric had a uniform surface feeling with no color difference, but the yarn length difference and the yarn floating rate were inferior, so that the yarn A constituting the sheath yarn was not sufficiently raised, and the yarn was bulky and bulged. Inferior, peach skin touch texture could not be obtained.

[Comparative Example 2]
Polyamide 66 drawn yarn (56dtex-98 filament, single yarn fineness 0.57dtex) having a hot water shrinkage rate of 13.2% is formed into filament A, and the hot water shrinkage rate is 13.6% and the heat shrinkage stress is 0.12 cN. Using a polyamide 6 drawn yarn (56 dtex-34 filament, single yarn fineness 1.65 dtex) of / dtex as yarn B, Taslan mixed yarn processing was performed on yarn A and yarn B under the conditions shown in Table 1 according to the manufacturing process of FIG. To obtain the original yarn of the polyamide core-sheath type mixed yarn. The difference in yarn length after treating the original yarn of the obtained mixed yarn with hot water at 98 ° C. for 30 minutes was 23.4%.

A woven fabric was prepared from the obtained mixed fiber yarn with the same design as in Example 1, and the physical properties were evaluated by the same method as in Example 1 through a processing step under the same conditions. The difference in yarn length of the mixed yarn was 18.1%, the fineness of the yarn A was 56.4 dtex, the fineness of the single yarn was 0.58 dtex, and the fineness of the filament B was 56.5 dtex, and the fineness of the single yarn was 1.66 dtex. The obtained twill woven fabric had a uniform surface feeling with no color difference, but because the yarn A constituting the sheath yarn was mixed with the yarn B forming the core yarn by forming a crunodal loop. It was bulky and inferior in swelling, and had a dry touch like a cloth using short fibers.

[Comparative Example 3]
Polyamide 66 drawn yarn (56dtex-98 filament, single yarn fineness 0.57dtex) having a hot water shrinkage rate of 13.2% is formed into filament A, and the hot water shrinkage rate is 30.0% and the hot water shrinkage stress is 0.25 cN. Using polyester drawn yarn (56 dtex-24 filament, single yarn fineness 2.33 dtex) of / dtex as filament B, the yarn A and yarn B are entangled and mixed under the conditions shown in Table 1 according to the manufacturing process of FIG. The original yarn of the core-sheath type mixed yarn was obtained. The difference in yarn length after treating the original yarn of the obtained mixed yarn with hot water at 98 ° C. for 30 minutes was 22.5%.

A woven fabric was prepared from the obtained mixed fiber yarn with the same design as in Example 1, and the physical properties were evaluated by the same method as in Example 1 through a processing step under the same conditions. The difference in yarn length of the mixed yarn was 16.5%, the fineness of the yarn A was 56.9 dtex, the fineness of the single yarn fineness was 0.58 dtex, and the fineness of the filament B was 57.1 dtex and the single yarn fineness was 2.38 dtex. Threads A that make up the sheath yarn stand out on the surface due to the difference in yarn length, and although a texture with bulge and peach skin touch is obtained, the obtained twill fabric has a heather-like surface feeling with different colors. A uniform surface feeling with no color difference could not be obtained.

1: Kurnodal loop 21: Polyamide drawn yarn 22: Guide 23: First feed roller 24: Polyamide drawn yarn 25: Guide 26: Second feed roller 27: Intertwined nozzle 28: Delivery roller 29: Polyamide core sheath type mixed fiber Thread 210: Take-up roller 31: Polyamide drawn thread 32: Guide 33: First feed roller 34: False twist heater 35: Cooling plate 36: Twister 37: First delivery roller 38: Polyamide drawn thread 39: Guide 310: No. Two feed rollers 311: Interention nozzle 312: Second delivery roller 313: Polyamide core-sheath type mixed yarn 314: Winding roller

Claims (7)

At least a part of the woven or knitted fabric contains a polyamide core-sheath type mixed yarn, and the difference in yarn length between the polyamide multifilament yarn A constituting the sheath yarn of the mixed yarn and the polyamide multifilament yarn B constituting the core yarn is large. is 10% or more, a polyamide multifilament yarn a which constitutes the sheath yarn is a woven or knitted fabric infusible such substantially free of loops,
A woven or knitted fabric characterized in that the single yarn fineness of the polyamide multifilament yarn A is 1.4 dtex or less, and the single yarn fineness of the polyamide multifilament yarn B is 0.9 dtex or more and 3.0 dtex or less . At least a part of the woven or knitted fabric contains a polyamide core-sheath type mixed yarn, and the difference in yarn length between the polyamide multifilament yarn A constituting the sheath yarn of the mixed yarn and the polyamide multifilament yarn B constituting the core yarn is large. is 10% or more, a polyamide multifilament yarn a which constitutes the sheath yarn is a woven or knitted fabric has substantially no loop, woven you wherein the polyamide multifilament yarn a is provisionally twisted yarn knit .. The woven or knitted fabric according to claim 1, wherein the polyamide multifilament yarn A is a false twisted yarn. The hot water shrinkage rate of the polyamide multifilament yarn A is 15% or less, the hot water shrinkage rate of the polyamide multifilament yarn B is 20% or more, and the heat shrinkage stress is 0.15 cN / dtex or more. A main yarn of a polyamide core-sheath type mixed yarn, characterized in that the heat shrinkage stress of Article B at 60 ° C. is as high as 0.05 cN / dtex or more. The original yarn of the polyamide core-sheath type mixed yarn according to claim 4, wherein the polyamide multifilament yarn A constituting the sheath yarn does not substantially have a loop. The source of the polyamide core-sheath type mixed yarn according to claim 4 or 5 , wherein the difference in yarn length between the polyamide multifilament yarn A constituting the sheath yarn and the polyamide multifilament yarn B constituting the core yarn is 5% or less. yarn. The original yarn of the polyamide core-sheath type mixed yarn according to any one of claims 4 to 6 , wherein the yarn length difference after being treated with hot water at 98 ° C. for 30 minutes is 15% or more.

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