JP2006124851A - Highly hygroscopic polyamide combined filament yarn with different shrinkage percentage and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly hygroscopic polyamide combined filament yarn with different shrinkage percentage exhibiting high hygroscopicity and having good feeling of fiber and provide a method for producing the yarn at low cost. <P>SOLUTION: The highly hygroscopic polyamide combined filament yarn with different shrinkage percentage contains a highly hygroscopic polyamide fiber A produced by blending polyamide 46 and one or more of other polyamide polymer components. The moisture absorption rate of the highly hygroscopic polyamide fiber A is ≥4%, and the combined filament yarn is composed of the highly hygroscopic polyamide fiber A and a polyamide B having a boiling water shrinkage larger or smaller than that of the highly hygroscopic polyamide fiber A by ≥5%. The highly hygroscopic polyamide combined filament yarn with different shrinkage percentage is produced by preparing the low-shrinkage polyamide fiber by spinning at a take-up speed of ≥2,400 m/min and subsequently drawing the product, preparing the high-shrinkage polyamide fiber by taking up at a speed slower than that of the low-shrinkage fiber by ≥200 m/min and subsequently drawing at a draw ratio higher than that of the low-shrinkage fiber, parallelling both fibers and winding at a speed of ≥4,000 m/min. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fiber excellent in handleability and comfort, and relates to a highly hygroscopic polyamide different shrinkage mixed yarn excellent in dimensional stability obtained by blending and spinning polyamide 46 with a specific polymer and a method for producing the same. Is.

  Natural fibers typified by cotton and wool are preferred because of their texture and comfort. The main factor of this comfortable wearing feeling is that the natural fiber has an appropriate hygroscopicity. However, natural fibers lack aesthetics such as suppleness and gloss, and are also insufficient in terms of a smooth surface touch, a cool feeling when worn, and the like. In addition, the wear resistance and strength are insufficient and are not suitable for sports applications.

  On the other hand, the polyamide fiber has excellent properties such as strength, flexibility, glossiness, color development, dyeing fastness, abrasion resistance, and softness. Therefore, it has been favorably used for textile products for clothing such as innerwear, sportswear, pantyhose and the like.

  Conventionally, nylon 6 is well known as a polyamide-based fiber, and since it has high strength and excellent durability, it is preferably used for various textile products for clothing. However, although the equilibrium moisture content (hygroscopicity in the standard state) of nylon 6 is higher than that of polyester fiber, the hygroscopicity is inferior to that of natural fiber, and the comfortable feeling when worn is still insufficient. For this reason, various attempts have been made to improve the hygroscopic properties of polyamide fibers such as nylon 6.

For example, a method for producing hygroscopic polyamide fibers from a polyamide composition in which polyvinyl pyrrolidone is added to polyamide fibers and a reducing agent is added during polymerization is disclosed (for example, see Patent Documents 1 and 2).
JP-A-7-150415 Japanese Patent Laid-Open No. 9-188917

  However, although these methods can surely obtain hygroscopic polyamide fibers, for example, since polyvinylpyrrolidone is a water-soluble polymer, even if it is added to the polymer, what has bleeded out to the polymer surface can be washed. There is concern that it will elute. Moreover, since the boiling water shrinkage rate is as high as 10% or more, care must be taken in handling with tumble drying or ironing.

Nylon 46 excellent in dimensional stability has been studied. For example, a fiber excellent in heat resistance and flexibility has been studied using a composite fiber having nylon 6 as a core component and nylon 46 as a sheath component (for example, , See Patent Document 3).
JP-A-8-158160

  However, since the melting point of nylon 6, which is the core component, is as low as around 220 ° C, there is no problem in applications where heat is applied only instantaneously, such as airbags, but in fields where durability at high temperatures is required, the melting point of nylon 6 Low is a problem. In addition, there remains a problem that the cost becomes high because a complicated nozzle block for complex spinning is required for spinning.

Nylon 46 has a high growth rate of spherulites, so the maximum draw ratio is low, and it is difficult to spin at a high speed or to fully draw, and it is difficult to increase the strength. Various attempts have been made in the past to solve the problem of spherulite formation (see, for example, Patent Document 4).
JP-A-63-112719

  However, in order to spray liquid mist onto the yarn discharged from the die and to cool and solidify it, it is necessary to provide a special device, which increases the cost.

Studies have also been made on mixed yarns of low-shrinkage polyamide and high-shrinkage polyamide. For example, a high-shrinkage fiber made of a polymer blend of an amorphous polyamide and an aliphatic polyamide consisting of an aromatic dicarboxylic acid and an aliphatic diamine, and mixed with a low-shrinkage polyamide fiber spun near 4000 m / min and wound without stretching. (For example, see Patent Document 5), or a mixture of high shrinkage polyamide fibers made of a copolymer of nylon 6 and nylon 66 and low shrinkage polyamide fibers spun at around 4000 m / min and wound without stretching ( For example, see Patent Document 6).
Japanese Patent Laid-Open No. 3-64516 JP 2000-355841 A

  However, in both cases, the moisture absorption rate is as low as about 3%, and the polymer components of the core yarn and the sheath yarn are different, so that the problem of irritability due to the difference in dyeing when dyed remains. Furthermore, since high shrinkage yarn uses amorphous polyamide or nylon 6/66 copolymer, it is necessary to prepare a special polymer, which increases the cost, and low shrinkage yarn is spun at around 4000 m / min. There was also a problem of poor operability and poor productivity.

  An object of the present invention is to provide a highly hygroscopic polyamide different shrinkage mixed yarn having a high hygroscopic property and a good fiber texture, and a method for producing the same at low cost.

That is, this invention consists of the following structures.
1. A blended yarn comprising a highly hygroscopic polyamide fiber A blended with polyamide 46 and at least one other polymer component, wherein the other polymer component constituting the highly hygroscopic polyamide fiber A is in an amorphous state in the fiber. At least one or more polyamide compounds present, the hygroscopic polyamide fiber A has a moisture absorption rate of 4% or more, and the mixed yarn has a boiling water shrinkage ratio higher than that of the high hygroscopic polyamide fiber A and the highly hygroscopic polyamide fiber A. Is a highly hygroscopic polyamide different shrinkage blended yarn, characterized in that it comprises a polyamide fiber B having a fiber diameter of 5% or more or 5% or more.
2. 2. The highly hygroscopic polyamide different shrinkage mixed yarn according to the first aspect, wherein the polyamide compound constituting the other polymer component of the highly hygroscopic polyamide fiber A is polyamide 6.
3. The high hygroscopic polyamide different shrinkage mixed yarn according to the first or second aspect, wherein the composition ratio of the polyamide 46 of the high hygroscopic polyamide fiber A and other polymer components is 65/35 to 35/65 .
4). The highly hygroscopic polyamide different shrinkage mixed yarn according to any one of the first to third aspects, wherein a recovery rate of the highly hygroscopic polyamide fiber A at 20% elongation is 70% or more.
5. The highly hygroscopic polyamide different shrinkage mixed yarn according to any one of the first to fourth aspects, wherein the dyeing speed of the highly hygroscopic polyamide fiber A is 60% or more.
6). The high hygroscopic polyamide fiber A according to any one of the first to fifth aspects, wherein the endothermic peak temperature of the melting temperature of the high hygroscopic polyamide fiber A by a DSC differential scanning calorimetry apparatus appears only at 270 ° C. or higher. Shrink mixed yarn.
7). 7. The high hygroscopic polyamide different shrinkage mixed yarn according to any one of the first to sixth aspects, wherein the polymer component of the polyamide fiber B is the same as that of the high hygroscopic polyamide fiber A.
8). The low shrinkage polyamide fiber, which was spun at a take-up speed of 2400 m / min and subsequently stretched, and the high shrinkage side, which was drawn at a speed slower than 200 m / min, and then stretched at a higher magnification than the low shrinkage polyamide fiber The method for producing a highly hygroscopic polyamide different shrinkage mixed yarn according to any one of claims 1 to 7, wherein the polyamide fibers are aligned and wound at a speed of 4000 m / min or more.

  According to the present invention, it is possible to provide a different shrinkage mixed yarn having a difference in shrinkage, which was difficult with nylon, and the different shrinkage mixed yarn having a difference in shrinkage as described above can be obtained by a simple method and at a low cost. It was possible to provide a manufacturing method to obtain. From the highly hygroscopic polyamide different shrinkage mixed yarn of the present invention, a fabric having a feeling of swelling excellent in handleability and comfort can be obtained.

Hereinafter, the present invention will be described in detail.
The polyamide 46 of the present invention is polytetramethylene adipamide, which is a condensation polymerization product of 1,4-diaminobutane and adipic acid, and further does not impair the purpose of the present invention. You may mix | blend additives, such as a fluorescent whitening agent, a ultraviolet absorber, an antistatic agent, and a flame retardant.

  The polymer component constituted with the polyamide 46 is not particularly limited as long as it is a polyamide having good affinity with the polyamide 46, and examples thereof include polyamide 6, polyamide 66, etc. Among them, price and ease of forming an amorphous state. From the viewpoint of hygroscopicity, polyamide 6 is preferable.

  As a method of blending the polyamide 46 and other polymer components, the respective polymers are mixed in a melted state, and a shearing force is applied to homogenize them, and then the strands are extruded, and the prepared chips are supplied to a general melt spinning apparatus. Method: The average surface area difference of polymer chips is set to 20% or less, each polymer is mixed in a predetermined amount in the state of chips, and a blended polymer obtained by stirring and homogenizing for 30 minutes or more in a blender is used for general melt spinning. A method of supplying to the equipment, a method of melting each polymer with a biaxial extruder, mixing them, further homogenizing with a static mixer, spinning, and a fixed amount of each polymer chip immediately before the extruder, stirring There is a method of spinning by supplying to the extruder through the apparatus, and any method may be adopted. There.

In order to make the polyamide mixed with the polyamide 46 exist in an amorphous state, it is necessary to increase the dispersion level of the polymer. Therefore, in the spinning process, the relationship between the pressure P1 at the extruder outlet and the pressure P2 in the spinneret Is preferably in the relationship of the following formula (1), and the relationship between the diameter D1 of the extruder outlet, the hole diameter D2 of the breaker plate, and the diameter D3 of the mouthpiece hole is preferably in the relationship of the following formula (2).
Formula (1) P1 <P2
Formula (2) D1>D2> D3
The reason is not clear, but for the relationship of P1 <P2, by selecting the pressure inside the spinneret to be larger than the pressure at the extruder outlet, one polymer is selected when it is pushed out of the gear pump, that is, when moving to the high pressure region It is thought that dispersibility is improved by increasing the density and facilitating movement of molecules at that moment. In addition, regarding the relationship of D1>D2> D3, it is considered that by gradually reducing the diameter of the passing orifice, a shearing force that increases stepwise is applied to the polymer, and the dispersibility between the polymers is improved.

  Although the polymer component comprised with the polyamide 46 is comprised from at least 1 or more types of polyamide compound, it is preferable that it is comprised only from a polyamide compound from an affinity viewpoint, and only 1 type of polyamide is preferable from a management viewpoint in industrial production. In particular, polyamide 6 is preferred.

  The polymer component configured with the polyamide 46 is preferably lower than the melt viscosity of the polyamide 46. This is because it is effective to concentrate the tension applied to the polymer discharged from the die in the spinning process toward the polyamide 46 in order to fiberize other polymers in an amorphous state. The relative viscosity difference is preferably 0.1 or more, and more preferably 0.3 or more. However, if the relative viscosity difference is too large, the spinning operability is deteriorated. Therefore, it is preferably 3 or less, and more preferably 2 or less.

  The relative viscosity of the highly hygroscopic polyamide fiber A is preferably 2.8 or more and less than 5.0. This is because, when the polyamide 46 and other polymer are mixed, if it is within this range, it is easy to produce without problems in spinning operability. A more preferable range is 3.0 or more and less than 4.0.

  The amorphous state of the other polymer component in the present invention means a state in which no crystal is formed. Specifically, the polymer component does not have an endothermic peak due to melting or is melted by measurement with a DSC differential scanning calorimeter. This refers to the case where the enthalpy ΔH is 5 cal / g or less. A crystalline polymer having a melting point begins to collapse in the vicinity of the melting point during the temperature rising process, and changes from a solid state to a liquid state. However, although the highly hygroscopic polyamide fiber A of the present invention is a crystalline polymer, other polymer components are present in an amorphous state in the fiber, and therefore, the important features of the present invention such as improved hygroscopicity. It has become an important element to draw out. For example, in the case of an ordinary polyamide 6 polymer single fiber, an endothermic peak having a melting enthalpy ΔH exceeding 5 cal / g is usually shown in a temperature range of about 220 ° C. However, for example, in the measurement with the DSC differential scanning calorimetry apparatus of the highly hygroscopic polyamide fiber A by the blend of the present invention in which polyamide 6 is selected as the other polymer component, the above endothermic peak does not appear. This means that the polyamide 6 is present in an amorphous state in the fiber. Therefore, it is an important factor that brings out the features of the present invention such as improved hygroscopicity.

  It is preferable that the highly hygroscopic polyamide fiber A contained in the different shrinkage mixed yarn of the present invention has an endothermic peak temperature of only 270 ° C. or higher when analyzed by a DSC differential scanning calorimetry apparatus. A fiber having an endothermic peak temperature of less than 270 ° C. is not preferable because the heat resistance is inferior. A more preferable range is 275 ° C. or higher, and further more preferably 280 ° C. or higher. Since the melting point of polyamide 46 is 290 ° C., an endothermic peak appears below 300 ° C.

  The hygroscopic polyamide fiber A contained in the different shrinkage mixed yarn of the present invention preferably has a moisture absorption rate of 4% or more. If it is less than 4%, it is not preferable because a feeling of peeling tends to remain when it is made into a fabric. More preferably, it is 5% or more. Higher is preferable, but it is usually about 10%.

  It is preferable that the composition ratio of the polyamide 46 and the other polymer component in the highly hygroscopic polyamide fiber A contained in the different shrinkage mixed yarn of the present invention is 65/35 to 35/65. When the proportion of the polyamide 46 exceeds 65%, it is not preferable to spin the take-up speed of 2000 m / min or more because the operability may be impaired. On the other hand, if it is less than 35%, other polymers are likely to be crystallized, and the hygroscopicity tends to be inferior. More preferably, it is 60 / 40-40 / 60, and 55 / 45-45 / 55 is still more preferable.

  The highly hygroscopic polyamide fiber A contained in the different shrinkage mixed yarn of the present invention preferably has a recovery rate of 70% or more when stretched by 20%. It has been found that the stretch recovery rate can be obtained by allowing other polymers having no stretchability to be present in the fiber in an amorphous state when the fiber is mixed with the polyamide 46. More preferably, it is 75% or more. More preferably, it is 80% or more. The recovery rate at 20% elongation is preferably as high as possible, and most preferably 100%, but many are 98% or less.

  The hygroscopic polyamide fiber A contained in the different shrinkage mixed yarn of the present invention preferably has a dyeing speed of 60% or more. The highly hygroscopic polyamide fiber A is likely to have a dyeing speed of 60% or more due to the presence of many amorphous polymers. If it is 60% or more, the dyeing process time can be shortened or the dyeing temperature can be lowered, so that the energy cost is reduced. More preferably, it is 70% or more, and further more preferably 80% or more. If the amount of amorphous polymer is too large, the yarn strength tends to be low, so the upper limit is preferably 95% or less.

  Further, the polyamide different shrinkage mixed yarn of the present invention is preferably composed of a low shrinkage side polyamide fiber and a high shrinkage side polyamide fiber having a boiling water shrinkage rate of 5% or more larger than that of the fiber. In general, it was difficult for polyamide 6 and polyamide 66 to greatly change the boiling water shrinkage even if the spinning conditions were slightly changed. However, the polyamide fiber contained in the different shrinkage mixed yarn of the present invention has a feature that the boiling water shrinkage rate can be easily controlled depending on the spinning conditions. Presumably, the polyamide 46 and other polymers interact with each other, and the crystallization of the polyamide 46 is easily controlled. The shrinkage ratio of the polyamide fiber on the high shrinkage side is preferably 15 to 35%, more preferably 20 to 30%. The difference in boiling water shrinkage between the polyamide fiber on the low shrinkage side and the polyamide fiber on the high shrinkage side is a large factor that determines the texture of the fabric. Therefore, a certain degree of shrinkage difference is necessary, preferably 10 to 30%, and more preferably 15 ~ 25%. The highly hygroscopic polyamide fiber A is contained in the highly hygroscopic polyamide different shrinkage mixed yarn of the present invention as a high shrinkage side and / or low shrinkage side fiber.

  When the polyamide fiber on the high shrinkage side is the highly hygroscopic polyamide fiber A, the spinning speed is preferably 2200 m / min or less as a production method for making the boiling water shrinkage 15% or more. In addition, it is preferable to set the stretching temperature to 50 ° C. or higher and the stretching set temperature to 130 ° C. or lower.

  On the other hand, when the low shrinkage polyamide fiber is the highly hygroscopic polyamide fiber A, the boiling water shrinkage is preferably 0 to 10%. If it exceeds 10%, the difference in shrinkage from the polyamide fiber on the high shrinkage side that becomes the core yarn tends to be small, and when it is made into a fabric, it tends to lack a feeling of swelling, which is not preferable. A more preferable range is 0 to 8%.

  A preferable production method for adjusting the boiling water shrinkage to a range of 0 to 10% is to set the spinning speed to 2400 m / min or more. Since the polyamide 46 is easily crystallized, the shrinkage rate is easily lowered. On the other hand, the spinning speed has to be slowed down or special cooling has to be performed, resulting in high cost. However, in the present invention, it is possible to obtain a polyamide 46 blend fiber having a low shrinkage and a low cost. However, if the take-up speed is 3500 m / min or more, the spinning operability deteriorates, which is not preferable. Of course, the polyamide fiber is preferably a polyamide multifilament.

  The mixing ratio of the highly hygroscopic polyamide fiber A and the polyamide fiber B is preferably 30/70 to 70/30 from the viewpoint of texture.

  The polymer components of the highly hygroscopic polyamide fiber A and the polyamide fiber B contained in the different shrinkage mixed yarn of the present invention are preferably the same. Since the polymer components are the same, the irritation at the time of dyeing hardly occurs. The polymer is most preferably a combination of polyamide 46 and polyamide 6.

  As a fiber blending method, after winding each fiber once, it may be mixed using a general fiber blender. However, as a high productive spinning fiber blending method, the take-up speed is 2400 m / min or more. Spinned and continuously stretched low-shrinkage side fibers and 200 m / min or slower at a slower speed, and subsequently stretched at a higher magnification than the low-shrinkage side fibers (high-shrinkage side) and wound at 4000 m / min or more. It is preferable to take. The low-shrinkage side fiber is taken up at 2700-3500 m / min, preferably 2900-3300 m / min, and then stretched at 1.3-2.5 times, preferably 1.5-2.3 times. It is preferable that the fiber is drawn at 1500 to 2200 m / min, preferably 1700 to 2000 m / min, and then drawn at 1.8 to 3.0 times, preferably 2.0 to 2.8 times.

  Examples of the cross-sectional shape of the fiber include, but are not limited to, a circular cross-sectional shape, a hollow shape, a star shape, a multileaf shape, a flat shape, a C shape, a V shape, a W shape, and an I shape.

Highly hygroscopic polyamide fibers are post-processed, knitted and woven by ordinary methods, and are sewn to produce various clothing products. Among them, innerwear (lingerie, foundation, etc.) and socks (stockings, pantyhose, tights, socks, etc.) worn directly on the skin, or sportswear (windbreaker, tennis wear, Suitable for ski wear, training wear, etc.

  Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In addition, the measurement and evaluation in an Example were performed as follows.

(A) The endothermic peak sample of the melting temperature in the analysis by the DSC differential scanning calorimetry apparatus uses about 5 mg of finely chopped fibers, and is a DSC3100S made by Mac Science, with a heating rate of 10 ° C./min from room temperature to 330 ° C., The measurement was performed under an argon gas atmosphere.

(B) A moisture absorption rate tube knitted fabric is prepared, and the oil agent is washed away with hot water of about 70 ° C. After drying at a temperature of 105 ° C. for 2 hours and measuring the weight SO, the moisture is adjusted for 24 hours under the conditions of a temperature of 20 ° C. and a humidity of 65% RH, and the weight S1 is measured.
Moisture absorption W0 (%) = {(S1-S0) / S0} × 100

(C) Recovery rate at 20% elongation Tensileon measuring device is stretched by 20% at a rate of 100% / min, and the elongation S at which it is unloaded immediately without holding time and becomes in a tension-free state is read from the chart. The recovery rate is expressed as follows.
Recovery rate (%) = {(20 −S) / 20} × 100

(D) Dyeing speed cylinder knitted fabric is prepared, and the oil agent is washed away with hot water at about 70 ° C. Use 3% owf of sianin 5R as a dye, put a sample in a bath at a bath ratio of 1:50, raise the temperature from 24 ° C. at a rate of 1 ° C./min as the initial temperature, and dye the dye exhaust rate after 10 minutes. The arrival speed.

(E) Boiling water shrinkage (SHW)
Apply a load corresponding to fineness x 1/30 g, mark the length of the original yarn 50.0 cm in advance, wrap it in gauze, immerse it in boiling water for 30 minutes, air dry and apply the same load between the marks The length L was measured and calculated by the following formula.
Boiling water shrinkage ratio SHW (%) = 100 × (50−L) / 50

(F) Relative viscosity 96.3 ± 0.1 wt% In a reagent grade concentrated sulfuric acid, the sample solution was prepared so that the polymer concentration was 10 mg / ml, and the sample solution was adjusted to 20 ° C. ± 0.05 ° C. The relative viscosity of the solution is measured using an Ostwald viscometer with a water drop time of 6 to 7 seconds at the temperature. In the measurement, using the same viscometer, the relative viscosity RV is calculated from the ratio of the drop time T0 (second) of 20 ml of sulfuric acid and the drop time T1 (second) of 20 ml of the sample solution, which is the same as the sample solution. Calculate using.
Relative viscosity RV = T1 / T0

Example 1
Chips of polyamide 46 having a relative viscosity of 3.6 and polyamide 6 having a relative viscosity of 3.1 were mixed at a ratio of 1: 1 and dried in a blender for 1 hour. The difference in the average surface area of each chip was 10%. The blended chip was melted with a uniaxial extruder and melt-spun using a die having a hole diameter of 0.24 mmφ and a hole number of 36 holes. At that time, the film was drawn at a speed of 3000 m / min, and was drawn 1.7 times at a drawing temperature of room temperature and a set roller temperature of 140 ° C. to obtain a 44T / 36 drawn yarn (low shrinkage side). Is 1900 m / min, the draw ratio is 2.7 times, the drawing temperature is 70 ° C., and the set temperature is 110 ° C. The side-drawn yarn and the high-shrinkage-side drawn yarn were aligned, entangled with an interlacer, and wound at 5100 m / min. Further, various physical properties were measured by winding a low-shrinkage-side drawn yarn and a 44T36F high-shrinkage-side drawn yarn alone. When the obtained yarn was analyzed by a DSC differential scanning calorimeter, it was found that there was no endothermic peak near the melting point (220 ° C.) of polyamide 6 in both drawn yarns, and an endothermic peak was present at 286 ° C. Thus, it was confirmed that polyamide 6 was present in an amorphous state. Table 1 shows the physical properties of the obtained drawn yarns. A plain woven fabric was woven from the obtained blended yarn at a warp density of 122 yarns / 2.54 cm and a weft yarn density of 84 yarns / 2.54 cm using an air jet loom, and refined, dyed and finished by ordinary methods. The obtained fabric was swelled and soft with no texture.

(Example 2)
The high shrinkage side drawn yarn of Example 1 and Toyobo Nylon 44T36F (polyamide 6, SHW 13%) were mixed using a general fiber mixer, and the same woven fabric as in Example 1 was prepared and finished. The obtained fabric was swelled and soft with no texture.

(Example 3)
A polyamide 66 having a relative viscosity of 3.2 was used instead of the polyamide 6 tip having a relative viscosity of 3.1 in Example 1, and the drawing speed was 2500 m / min, and the set roller temperature was stretched 2.0 times at 110 ° C. Thus, a highly contracted side drawn yarn was obtained. Since only an endothermic peak was present at 286 ° C. and no endothermic peak was present near the melting point of the polyamide 66, it was confirmed that the polyamide 66 was present in an amorphous state. A woven fabric was obtained in accordance with Example 1 except that the yarn and Toyobo Nylon 44T36F (polyamide 6, SHW 13%) were mixed using a general mixing machine. The obtained fabric was rich in swelling.

(Comparative Example 1)
Weaving a plain fabric with a warp density of 135 / 2.54 cm and a weft density of 88 / 2.54 cm using only the drawn yarn on the high shrinkage side obtained in Example 1, and refining, dyeing and finishing by conventional methods Went. The resulting woven fabric lacked swelling.

(Comparative Example 2)
Take-up speed 2200 m / min, draw ratio 2.3 times, set roller temperature 120 ° C. as high shrink side drawn yarn, take-up speed 2300 m / min, draw ratio 2.2 times, set roller temperature as low shrink side drawn yarn Example 1 was followed except that the temperature was 110 ° C. In both drawn yarns, no endothermic peak was present near the melting point (220 ° C.) of polyamide 6, and an endothermic peak was present at 286 ° C. Table 1 shows the physical properties of the obtained drawn yarns. A plain woven fabric was woven in the same plan as in Example 1, and refining, dyeing, and finishing were performed by a conventional method. The resulting woven fabric lacked swelling.

  According to the present invention, a different shrinkage mixed yarn having a different shrinkage rate, which was difficult with nylon, is excellent in hygroscopicity, and a fabric having a feeling of swelling can be obtained.

It is an example of the chart figure by the DSC differential scanning calorimetry apparatus which measured the fiber which comprises the mixed fiber of this invention. It is a schematic diagram which shows an example of the manufacturing method of this invention.

Explanation of symbols

1: endothermic peak 2: spinneret 3: take-up roller 4: set roller 5: winder

Claims (8)

  A blended yarn comprising a highly hygroscopic polyamide fiber A blended with polyamide 46 and at least one other polymer component, wherein the other polymer component constituting the highly hygroscopic polyamide fiber A is in an amorphous state in the fiber. At least one or more polyamide compounds present, the hygroscopic polyamide fiber A has a moisture absorption rate of 4% or more, and the mixed yarn has a boiling water shrinkage ratio higher than that of the high hygroscopic polyamide fiber A and the highly hygroscopic polyamide fiber A. Is a highly hygroscopic polyamide different shrinkage blended yarn, characterized in that it comprises a polyamide fiber B having a fiber diameter of 5% or more or 5% or more.   The highly hygroscopic polyamide different shrinkage mixed yarn according to claim 1, wherein the polyamide compound constituting the other polymer component of the highly hygroscopic polyamide fiber A is polyamide 6.   The high hygroscopic polyamide different shrinkage mixed yarn according to claim 1 or 2, wherein the composition ratio of the polyamide 46 of the high hygroscopic polyamide fiber A and other polymer components is 65/35 to 35/65.   The highly hygroscopic polyamide different shrinkage mixed yarn according to any one of claims 1 to 3, wherein the high hygroscopic polyamide fiber A has a recovery rate of 70% or more when stretched by 20%.   The highly hygroscopic polyamide different shrinkage mixed yarn according to any one of claims 1 to 4, wherein a dyeing speed of the high hygroscopic polyamide fiber A is 60% or more.   6. The highly hygroscopic polyamide shrinkage according to claim 1, wherein the endothermic peak temperature of the melting temperature of the highly hygroscopic polyamide fiber A by a DSC differential scanning calorimetry apparatus appears only at 270 ° C. or more. Mixed yarn.   The highly hygroscopic polyamide different shrinkage mixed yarn according to any one of claims 1 to 6, wherein the polymer component of the polyamide fiber B is the same as that of the highly hygroscopic polyamide fiber A.   The low shrinkage polyamide fiber spun at a take-up speed of 2400 m / min and subsequently stretched, and the high shrinkage side drawn at a speed slower than 200 m / min and then stretched at a higher magnification than the low shrinkage polyamide fiber The method for producing a highly hygroscopic polyamide different shrinkage mixed yarn according to any one of claims 1 to 7, wherein the polyamide fibers are aligned and wound at a speed of 4000 m / min or more.

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