JPWO2013129135A1 - Polyamide blended composite yarn for false twist - Google Patents

Abstract

By providing false twisting, a polyamide mixed composite yarn for false twist suitable for obtaining a high-quality woven or knitted fabric having softness, water absorption, quick-drying properties, and mild glossiness is provided. A polyamide mixed fiber composed of at least two types of filaments having different cross-sectional shapes dispersed and mixed, wherein the cross-sectional shape perpendicular to the longitudinal direction of at least one type of filaments does not have a recess. The cross-sectional shape in the direction perpendicular to the longitudinal direction of the other filaments is a shape having a recess, and the average fineness of the filaments for each type is in the range of 1.3 dtex or less. Polyamide blended composite yarn.

Description

  The present invention relates to a polyamide mixed fiber composite yarn for false twisting in which filaments having at least two or more different cross-sectional shapes having a single yarn fineness of 1.3 dtex or less are dispersed. Furthermore, the present invention relates to a false twisted polyamide blend composite yarn suitable for obtaining a high-quality woven or knitted fabric having softness, water absorption, quick drying, and excellent mild glossiness by applying false twisting. .

  Polyamide multifilament, one of the synthetic fibers, has excellent characteristics such as high strength, abrasion resistance, softness, and clearness of dyeing. Therefore, legwear such as pantyhose and tights, innerwear such as lingerie and foundation. It has been used favorably for apparel applications such as clothing, sportswear and casual wear.

  However, consumer needs in recent years have been demanding higher softness and slimeness, a texture such as mild luster, and high functionality such as water absorption and quick-drying. There has been a demand for irregularization by so-called multi-lobal, such as forming a filament and providing a plurality of recesses in the cross section.

As a conventional modified cross-section synthetic fiber multifilament, for example, a mixed fiber in which at least two kinds of synthetic fiber multifilaments are dispersed is known (Patent Document 1).
Moreover, as a conventional mixed fiber composite yarn, for example, a mixed fiber in which at least two types of single filaments having different cross-sectional shapes are dispersed is known (Patent Document 2).
On the other hand, for example, the same number of six-leaf / round cross-section polyamide multifilaments having a single-filament fineness of 0.99 dtex is known as a single-filament fineness deformed cross-section polyamide multifilament (Patent Document 3).

Japanese Patent Laid-Open No. 10-266036 Japanese Patent Laid-Open No. 7-34341 JP 2009-84749 A

  However, in the invention described in Patent Document 1, since the single yarn fineness of at least two types of synthetic fiber multifilaments differs by 3 deniers or more, the bending stiffness of the synthetic fiber multifilament is high, and a dyeing difference due to the single yarn fineness difference occurs. There was a problem that it was not suitable for apparel use such as leg wear, inner wear, sports wear, and casual wear.

  In the invention described in Patent Document 2, the mixed yarn in which at least two types of single filaments having different cross-sectional shapes are dispersed is a polyester multifilament, which is inferior in softness, strength, and wear resistance as compared with a polyamide multifilament. Therefore, in order to pursue further softness, which is a consumer need in recent years, it is necessary to make the single yarn finer and multifilament, but the strength and wear resistance are low, leg wear, inner wear, sports wear There was a problem that it was not suitable for clothing such as casual wear.

  Furthermore, in the invention described in Patent Document 3, although the same number of six-leaf / round cross-section polyamide multifilaments having a single yarn fineness of 0.99 dtex, it is a drawn yarn as a yarn form, and water absorption and quick drying properties can be obtained. There was a problem that it was not possible to obtain a further soft feeling that is a consumer need.

  The present invention solves the above-mentioned problems of the prior art and provides a high-quality woven or knitted fabric having a soft feeling and excellent in water absorption, quick-drying and mild gloss by applying false twisting. It is an object of the present invention to provide a suitable false twisted polyamide mixed composite yarn.

  (1) A polyamide mixed fiber comprising at least two types of filaments having different cross-sectional shapes dispersed and mixed, wherein the cross-sectional shape perpendicular to the longitudinal direction of at least one type of filaments has a recess. The cross-sectional shape perpendicular to the longitudinal direction of the other filaments is a shape having a recess, and the average fineness of the filament for each type is in a range of 1.3 dtex or less. Polyamide mixed composite yarn for false twist.

  (2) The length of a perpendicular dropped from the tangent line that touches two adjacent convex portions across the concave portion of the cross-section of the filament having a concave portion to the bottom of the concave portion formed between the two convex portions The polyamide mixed composite yarn for false twisting according to (2), wherein b has a cross-sectional shape smaller than the yarn radius of a filament having a cross-sectional shape having no recess.

  (3) The polyamide mixed composite yarn for false twisting according to the above (1) or (2), wherein the degree of globalization LB of the cross-sectional shape of the filament having concave portions is 5 or more and 60 or less.

  (4) The polyamide mixed composite yarn for false twisting according to any one of (1) to (3), wherein the cross-sectional ratio of the single filament having a concave section and the other single filament is 30 to 70%. .

  (5) A false twisted yarn obtained by false twisting the polyamide mixed composite yarn for false twist according to any one of (1) to (4).

  (6) The false twisted yarn according to (5), wherein the expansion / contraction recovery rate (CR2) is 5 to 20%.

  The polyamide mixed composite yarn for false twisting of the present invention is a polyamide mixed composite yarn for false twist in which single yarn fineness is thin and at least two kinds of single filaments having different cross-sectional shapes are dispersed. Therefore, it is possible to obtain a high-quality woven or knitted fabric having a soft feeling and excellent in water absorption, quick drying, and mild gloss.

It is an example of the cross-sectional shape of the orthogonal | vertical direction with respect to the longitudinal direction of the irregular cross-section filament in this invention. It is an example which shows the dispersion | distribution state of the preferable filament in the polyamide mixed fiber composite yarn for false twist of this invention. It is the schematic explaining the fiber cross-sectional shape which does not have a recessed part in this invention. It is the schematic explaining the fiber cross-sectional shape which does not have a recessed part in this invention. It is the schematic explaining the fiber cross-sectional shape which does not have a recessed part in this invention. It is the schematic explaining the fiber cross-sectional shape which does not have a recessed part in this invention. It is the schematic which shows an example of the manufacturing process of the polyamide mixed fiber composite yarn for false twists concerning this invention. It is the schematic which shows an example of the manufacturing process at the time of using the cooling device which blows off cooling air from the inner side to the outer side. It is the schematic which shows an example of the manufacturing process at the time of using the cooling device which blows off cooling air inside from the outer side.

  Hereinafter, the present invention will be described in more detail.

  It is important that the polyamide mixed composite yarn for false twisting of the present invention is mainly composed of polyamide. The term “mainly” as used herein refers to a polyamide having 80 mol% or more of amide units among repeating units, and preferably 90 mol% or more of amide units among repeating units.

  The polyamide used in the present invention is a resin composed of a high molecular weight substance in which a so-called hydrocarbon is connected to the main chain through an amide bond. Specifically, polycaproamide, polyundecanamide, polydodecanamide, Tetramethylene adipamide, polypentamethylene adipamide, polypentamethylene sebamide, polyhexamethylene adipamide, polyhexamethylene sebamide, polyhexamethylene dodecanamide, polyhexamethylene tridecanamide, etc. A copolymer is mentioned.

  From the economical aspect, relatively easy spinning, excellent dyeability and mechanical properties, the polyamide is preferably a polyamide mainly composed of polycapramide and polyhexamethylene adipamide. The term “mainly” as used herein refers to 80 mol% or more as hexamethylene diammonium adipate units constituting polyhexamethylene adipamide as ε-caprolactam units constituting polycaproamide, more preferably It is 90 mol% or more.

  The polyamide mixed fiber composite yarn for false twisting according to the present invention preferably has a 98% sulfuric acid relative viscosity at 25 ° C. in the range of 2.2 to 3.7, and more preferably in the range of 2.4 to 3.3. Is more preferable, and the range of 2.4 to 2.7 is more preferable.

  The polyamide mixed fiber composite yarn for false twisting of the present invention may contain various additives as long as the effects of the present invention are not impaired. Examples of this additive include stabilizers such as manganese compounds, colorants such as titanium oxide, flame retardants, conductivity-imparting agents, and fibrous reinforcing agents.

  As for the single yarn fineness of the polyamide mixed fiber composite yarn for false twist of the present invention, the average value of each of at least two types of single filaments having different cross-sectional shapes is 1.3 dtex or less, and is 0.1 to 1.3 dtex. It is preferably 0.3 to 1.1 dtex, more preferably 0.4 to 1.0 dtex. When the average value of the single yarn fineness of at least two filaments having different cross-sectional shapes is greater than 1.3 dtex, softness and water absorption are obtained when the fabric is made of false knitted fabric after false twisting. It will be lacking in nature.

  The mixed fiber composite yarn of the present invention is a multifilament yarn obtained by combining filament yarns having different cross-sectional shapes. There are two or more types of cross-sectional shapes perpendicular to the longitudinal direction of the filament, of which at least one type of filament is made of a filament yarn having a cross-sectional shape having no concave portion, and the other filaments have at least one concave portion. It is important to have a filament cross-sectional shape (hereinafter sometimes referred to as an irregular cross-section).

  It is important that the irregular cross-sectional shape of the filament having the irregular cross-section has at least one recess. When there is no concave portion, a sufficient gap cannot be formed between the single yarns of the multifilament, so that it is inferior in terms of functions such as water absorption when made into a fabric. A more preferable modified cross-sectional shape is a modified cross-sectional shape having the same number of convex portions as two to eight concave portions, and the convex portions projecting radially at equal angular intervals. Thereby, when it is set as fabrics, such as a woven or knitted fabric, a mild glossiness is acquired according to water absorption. Furthermore, it is desirable to have an irregular cross-sectional shape that has the same number of convex portions as three to six concave portions, and each convex portion projects radially at equal angular intervals.

  In the present invention, “the shape in which the cross-sectional shape perpendicular to the longitudinal direction of the filament does not have a concave portion” means a single yarn having a shape that does not literally have a concave portion such as a perfect circle, an ellipse, a lens, a square / rectangular shape, and a polygon. However, a more preferable shape is a perfect circle. Here, the true circular shape does not need to be strictly a perfect circle, and may be a so-called round cross section such as a shape represented by a fiber cross section obtained by spinning from a normal round hole discharge hole. That's fine.

  Specific examples of the cross-sectional shape having no recess are the circles shown in FIG. 3, the ellipse shown in FIG. 4, the rice ball type shown in FIG. 5, and the polygon more than the triangle shown in FIG. 6. One with a rounded corner is listed. In these, as shown in FIG. 3, when a tangent line (L1) is drawn, a plurality of contacts do not exist, and only one contact (S1) exists.

Next, a composite state of a filament having a cross-sectional shape having a concave portion and a filament having a cross-sectional shape not having a concave portion is formed by dispersing and mixing the filaments having different cross-sectional shapes. Each single filament is preferably dispersed and mixed in a random state without distinction in cross-sectional shape.
A preferable mixed fiber state is as shown in FIG. 2, and the single filaments of the respective cross-sectional shapes are not in a state of forming a group of blocks, but are appropriately dispersed without distinction in the cross-sectional shape. When applied, each cross-sectional shape is easily distributed and arranged on the surface of the yarn, so the smooth texture and mild luster due to the combined effect of the cross-section with recesses and the cross-section without recesses is more effective. Can be obtained. In addition, FIG. 2 is an example which shows the dispersion | distribution state of the preferable filament in the polyamide mixed fiber composite yarn for false twist of this invention.

On the other hand, in the case of a composite yarn having a core-sheath two-layer structure formed by aggregating filament yarns having respective cross-sectional shapes, a smooth texture due to a harmonious composite effect is less likely to be obtained compared to the dispersion type. Since there exists a tendency, the said dispersion type is preferable.
Moreover, when the mixed fiber composite yarn of the present invention is in contact with at least one kind of filaments having a cross-sectional shape having no recesses and at least one kind of filaments having a cross-sectional shape having the recesses, the cross-sections of the filaments It is preferable to include a filament having a cross-sectional shape capable of forming a void.

  This is because even if the filaments of the mixed fiber composite yarn are closely packed, a gap is sufficiently formed between the filaments, and a dry feeling can be obtained by false twisting. A void formed in the arrangement of the cross-sectional shape filaments and the cross-sectional shape filaments having the recesses provides a woven or knitted fabric to which effective water absorption is provided by capillary action.

  Further, since the filament yarn having a cross-sectional shape having a concave portion is in a mixed state, it is possible to obtain a woven fabric having a smooth texture even in the water retaining state of the absorbed water, and further having the above specific relationship By mixing the cross-sectional shape having the recesses and the cross-sectional shape not having the recesses, it is possible to provide a woven or knitted fabric that exhibits excellent water absorption even in the false twisted state.

  Moreover, the mixed fiber composite yarn of the present invention has a concave portion formed between the two convex portions with respect to a tangent line that touches two adjacent convex portions across the concave portion of the cross section of the filament having a concave portion. It is preferable that the length of the perpendicular dropped to the bottom point b is smaller than the yarn radius of the filament having a cross-sectional shape having no recess. For example, referring to FIG. 2, a concave portion formed between two convex portions with respect to a convex portion of a cross-section of a single filament having a concave portion and a tangent line that touches the convex portion adjacent to the convex portion. That is, the length b of the perpendicular line dropped to the bottom point is smaller than the yarn radius of the filament having a cross-sectional shape having no recess.

  In this case, since filaments that do not have recesses are not taken into the filaments that have recesses, each filament is easy to move freely in the composite yarn when false twisted, and the bulkiness is maintained, with a smooth texture. In addition, the interfiber gap is maintained without being clogged, and the water absorption is excellent. In addition, the measurement of the length b of the perpendicular is performed by selecting a deformed cross-section filament by the method (1) among the calculation methods (1) to (3) of the later-described lobar degree LB, and by the method (2). The length b of the perpendicular is measured and the average value is calculated. The measurement of the yarn radius is performed by the method described later.

  The relationship between the single yarn fineness D1 of the filament having a cross-sectional shape without a concave portion and the single yarn fineness D2 of the filament having a cross-sectional shape having a concave portion is 0.5 ≦ D2 / D1 ≦ 2.0 from the viewpoint of dry feeling and water absorption effect. Preferably there is. The single yarn fineness D1 having a cross-sectional shape having no concave portion and the single yarn fineness D2 of a filament having a cross-sectional shape having a concave portion are average fineness. The single yarn fineness is calculated by the method described later.

The degree of global LB will be described with reference to FIG. FIG. 1 is an example of a modified cross-section fiber in the present invention. As shown in FIG. 1, the degree of globalization LB is relative to the length a of the tangent line between the contact points S ₁ and S ₂ at the _two convex portions adjacent to each other across the concave portion in the deformed section single yarn cross section of the false twisting polyamide fiber. The percentage (%) of the ratio of the length b of the perpendicular line extending from the low point of the concave portion formed between the two convex portions to the tangent line. That is, LB (%) = 100 × b / a.

  The average value of the global degree LB is calculated by the following method.

  (1) Ten irregularly shaped filaments having at least one concave portion and the same type of shape are randomly selected (when the number of filaments is 10 or less, all irregularly shaped filaments are measured).

  (2) For each filament, the tangent length a and the perpendicular length b of all the recesses in the filament are measured to calculate the globality LB, and the average value x is calculated for each filament.

  (3) The average value x of the calculated average values x for each filament is calculated.

  In the present invention, the cross-sectional shape having the concave portion is a cross-sectional shape having a value of 5 or more and 60 or less in terms of the degree of globalization LB defined below from the viewpoint of texture and water absorption when the woven or knitted fabric is formed. Preferably there is. More preferably, it has a cross-sectional shape having a value of 10 to 40 in the global degree LB, and further preferably a cross-sectional shape having a value of 10 to 30.

  The polyamide mixed fiber composite yarn for false twisting of the present invention can suppress the generation of streaks after dyeing to the utmost by using a mixed fiber with a filament having no recess, and the porosity between the filaments can be reduced. Capillary phenomenon works, and when it is made into a fabric, higher water absorption can be imparted.

  The blend ratio of the filament yarn having a cross-sectional shape having at least a concave portion and the single filament yarn having a cross-sectional shape not having a concave portion of the polyamide mixed fiber composite yarn for false twist of the present invention is the texture and water absorption characteristics when used as a woven fabric or a knitted fabric. In view of the above, it is preferably 20:80 to 80:20, and more preferably 30:70 to 70:30. More preferably, it is 40: 60-60: 40. In addition, the said mixed fiber ratio shall be based on the method mentioned later.

  An example of the production method of the false twisted polyamide mixed composite yarn of the present invention will be specifically described with reference to FIG. FIG. 7 is a schematic view showing an example of a production process of a false twisted polyamide mixed composite yarn according to the present invention. After the melted polyamide is discharged from the base 1 and passed through the heat retention zone 2 below the base, it is cooled to room temperature by blowing cooling air with a chimney 3 to form a yarn. The oil supply device 4 supplies and converges, interlace nozzle 5 gives interlace, passes through take-up rollers 6, 7, and winder (winding device) 8 winds up. In addition, 9 is a fiber filament, 10 is a fiber product package. When the yarn is cooled, the molten thermoplastic polymer as shown in FIG. 8 is discharged from the base 1 for the purpose of suppressing the cooling unevenness between the single yarns and reducing the fineness unevenness in the longitudinal direction of the yarn. After passing 2, a cooling device 11 that blows cooling air from the inside to the outside cools the fiber filament 9 to room temperature, and a molten thermoplastic polymer as shown in FIG. 9 is discharged from the die 1. Then, after passing through the heat retention zone 2 below the base, a method of cooling the fiber filament 9 to room temperature with a cooling device 12 that blows cooling air from the outside to the inside may be used. FIG. 8 is a schematic view showing an example of a manufacturing process when a cooling device that blows cooling air from the inside to the outside is used. FIG. 9 shows a manufacturing process when a cooling device that blows cooling air from the outside to the inside is used. It is the schematic which shows an example.

  The melt spinning temperature is not limited as long as the polyamide twisted composite yarn for false twisting of the present invention is obtained, and is usually used, for example, 240 to 260 ° C. in the case of polycaproamide, polyhexamethylene adipamide. In the case of 275 to 295 ° C., the same base is used, but the viscosity at the time of melt spinning is high (for example, when the melt spinning temperature is low or the viscosity of polyamide is high) and the degree of globalization LB Increases, and the viscosity tends to decrease when the viscosity is low (for example, when the melt spinning temperature is high or when the viscosity of the polyamide is low).

  The production method of the false-twisted polyamide mixed composite yarn of the present invention is not particularly limited, but the polyamide is melted, discharged from the die, cooled by blowing cooling air, and converged (that is, an oil agent). From the viewpoint of cost, a one-step method in which an interlace nozzle is applied and wound on a package is preferable.

  The elongation of the false twist polyamide fiber of the present invention is preferably 45 to 70%. If the elongation is too low, the tensile resistance of the filament is increased, and the actual number of twists that are twisted in the false twisting process is reduced, so that it is difficult to impart sufficient crimp to the obtained processed yarn. In yarn, yarn breakage and fluff are likely to occur, and high-order passability tends to be inferior. On the other hand, if the elongation is too high, the actual number of twists to be twisted becomes excessive, fluffing occurs in the obtained processed yarn, the strength tends to decrease, and the drawn yarn has a high residual elongation. There is a tendency that streaks are likely to appear in the woven or knitted fabric, and the quality tends to be inferior. The measurement of the said elongation shall be based on the below-mentioned method.

  The stress when the obtained false twisting polyamide fiber is stretched by 15% is preferably 1.0 to 2.0 cN / dtex, and more preferably 1.2 to 1.8 cN / dtex. If the stress at 15% elongation is too low, the tension during false twisting will be too low, the processed yarn will be broken or the working tension will be changed easily, the quality of the processed yarn will be lowered, and the yield will be deteriorated. On the other hand, if the stress at 15% elongation is too high, a large tension is concentrated on the interlace part when false twisting is performed, causing breakage of the single yarn, which tends to deteriorate the process passability and the quality of the woven or knitted fabric. The measurement of the stress when the 15% elongation is performed is based on the method described later.

  The polyamide mixed composite yarn for false twisting of the present invention is wound once, and then transported to the false twisting step, which is the next step, and is subjected to crimping to make a false twisted yarn into a knitted or woven fabric. Processed. The method for false twisting of the polyamide mixed fiber composite yarn for false twisting of the present invention is not particularly limited, but after the yarn is fed from the polyamide mixed fiber composite yarn package for false twist and heated by a heater or the like, the false twisted disk or the like After applying false twisting, a finishing agent is applied to form a false twisted yarn package.

  A preferred example of false twisting is given. That is, a fiber is drawn from a polyamide mixed fiber composite yarn package for false twisting at 300 to 800 m / min and heated as a first false twisting heater (1HT) for 0.05 to 0.50 seconds with a heater at 150 to 240 ° C. Stretching simultaneous false twisting is performed while stretching about 1.1 to 1.5 times. At this time, the stretching simultaneous false twisting is performed using a friction false twisting tool or the like. Furthermore, the crimpability may be lowered by using a second heater (2HT). In this case, 2HT may be a contact type or a non-contact type, but the second heater temperature is suitably 120 to 220 ° C, preferably 140 to 190 ° C. Thereafter, an oil agent of about 1.0 to 3.0% is applied to the weight of the false twisted yarn. Moreover, you may provide an interlace in order to improve the convergence of a process yarn before and after oil agent provision.

  Although the polyamide fiber for false twisting of the present invention can be uniformly twisted, it can obtain tights that are excellent in appearance and feel, but this is not restrictive.

  Moreover, it is preferable that the expansion / contraction recovery rate (CR2) of the obtained false twisted yarn is 5 to 20%, and more preferably 8 to 12%. When the expansion / contraction recovery rate (CR2) is too low, when a fabric such as a woven or knitted fabric is used, it is difficult to maintain the crimped form of the false twisted yarn, and the soft feeling and water absorption tend to be inferior. On the other hand, if the expansion / contraction recovery rate (CR2) is too high, the false twisted yarn tends to be bulky when it is made into a fabric such as a woven or knitted fabric, and the eyes of the woven or knitted fabric tend to become clogged and become coarse. The expansion / contraction restoration rate (CR2) is measured by the method described later.

Hereinafter, the present invention will be described in detail by way of examples.
Each characteristic value in the examples was determined according to the following method.

(1) Titanium oxide content 5 g of a sample was precisely weighed and placed in a magnetic crucible, and ashed at 1000 ° C. using an electric furnace, and the ignition residue was expressed as wt% as titanium oxide.

(2) Sulfuric acid relative viscosity A sample is weighed and dissolved in 98% by weight concentrated sulfuric acid so that the sample concentration (C) is 1 g / 100 ml, and the solution is dropped by an Ostwald viscometer at 25 ° C. (T1 ). Furthermore, about 98 weight% concentrated sulfuric acid which has not melt | dissolved the sample, after dropping the number of seconds (T2) in 25 degreeC similarly, the relative viscosity ((eta) r) of a sample is computed by the following Formula.
(Ηr) = (T1 / T2) + {1.891 × (1.000−C)}.

(3) Total fineness, single yarn fineness and blending ratio Using a measuring machine with a frame circumference of 1.125 m, a sample of 27 dtex or less was rolled 400 times, and a sample of 28 dtex or more was made 200 turns (n The total fineness was calculated from the value obtained by weighing the weight of the cake with a balance and multiplying by the official moisture content after drying with a hot air dryer (105 ± 2 ° C. × 60 minutes). The measurement was performed four times, and the calculated fineness was averaged to obtain the fineness. Further, for the single yarn fineness in at least two types of filaments having different cross-sectional shapes, the area ratio of the total area of the filament cross-sections in each cross-sectional shape is calculated by the following formula, and the total fineness is multiplied by the area ratio. The value was divided by the total number of filaments of the same shape. Moreover, the area ratio of the total area of the filament cross section in each cross-sectional shape was made into the mixed fiber ratio.
Area ratio of section A = area of section A / (area of section A + area of section B)
Area ratio of section B = area of section B / (area of section A + area of section B)
Single yarn fineness (dtex) of cross section A in the mixed filaments = (total fineness (dtex) × area ratio of cross section A) / number of filaments of cross section A Single yarn fineness (dtex) of cross section B in the mixed filaments = ( Total fineness (dtex) × area ratio of section B) / number of filaments in section B

(4) Area ratio Dissolving a packing agent composed of paraffin, stearic acid, and ethyl cellulose, solidifying the raw yarn by allowing it to stand at room temperature, and cutting the raw yarn in the packing agent in the cross-sectional direction is Tokyo Electronics ( The cross section of the fiber was photographed with a CCD camera (CS5270) manufactured by Co., Ltd., and image processing was performed with a monitoring device (EMM-3100) manufactured by Micro-MEASURE for all deformed filaments having one or more recesses. Using a cross-section photograph printed at 3000 times with a color video processor (SCT-CP710) manufactured by Mitsubishi Electric, select all of the deformed filament cross-section photographs of at least one deformed filament cross-section and have a recess. All filament cross-sectional photographs with no filament cross-section were selected, and the respective area ratios were calculated.

(5) Depression global LB (average value), b
A CCD manufactured by Tokyo Denshi Co., Ltd. is prepared by dissolving a packing agent composed of paraffin, stearic acid, and ethyl cellulose, solidifying the yarn by allowing it to stand at room temperature and then cutting the yarn in the packing material in the cross-sectional direction. The cross section of the fiber is photographed with a camera (CS5270), a filament is selected at random, and there are two or more concave portions selected at random (all when the number of filaments is 10 or less). The irregular single yarn was subjected to image processing with a monitoring device (EMM-3100) manufactured by Micro-MEASURE, and a cross-sectional photograph printed at 3000 times with a color video processor (SCT-CP710) manufactured by Mitsubishi Electric was used. The measurement of the length b of the perpendicular and the degree of globalization LB and the calculation of the average value were performed as follows.
The degree of globalization LB is calculated by LB (%) = 100 × b / a, and which average value is calculated by the following method.
(1) Ten irregularly shaped filaments having at least one concave portion and the same type of shape are randomly selected (when the number of filaments is 10 or less, all irregularly shaped filaments are measured).
(2) For each filament, the tangent length a and the perpendicular length b of all the recesses in the filament are measured to calculate the globality LB, and the average value x is calculated for each filament.
(3) The average value x of the calculated average values x for each filament is calculated.

(6) Yarn radius Dissolving a packing agent composed of paraffin, stearic acid, and ethylcellulose, solidifying the yarn after standing by introducing it to room temperature, and cutting the yarn in the packing material in the cross-sectional direction is Tokyo Electronics ( The cross section of the fiber was photographed with a CCD camera (CS5270) manufactured by Co., Ltd., the filaments were selected at random, and ten (all if the number of filaments is 10 or less) recesses randomly selected among the filaments were selected. For cross-sectional shapes that do not have, image processing is performed with a monitoring device (EMM-3100) manufactured by Micro-MEASURE, and a cross-sectional photograph printed at 3000 times with a color video processor (SCT-CP710) manufactured by Mitsubishi Electric is used. Measure the radius of the smallest circle circumscribing the cross-section of the filament cross-section with no recess. Averaged.

(7) Elongation The elongation is measured by using TENSIRON RPC-1210A manufactured by ORIENTEC, gripping at a gripping interval of 50 cm, stretching at a pulling speed of 50 cm / min, and measuring the pulling length when the yarn breaks three times. The average value was divided by 50 cm and multiplied by 100.

(8) 15% elongation stress 15% elongation stress is ORIENTEC's TENSIRON RPC-1210A,
Gripping was performed at a gripping interval of 50 cm, stretched at a pulling speed of 50 cm / min, and the tension when stretched to 57.5 cm was measured three times, and the average value was divided by the fineness of the fiber.

(9) Expansion / contraction recovery rate (CR2)
The false twisted yarn was wound 10 times by using a measuring machine with a circumference of 1.0 m, and then crushed, and then the initial load of total fineness x 0.002 x number of windings x 2 / 1.111 g. The mixture is treated with hot water at a temperature of 98 ° C. for 20 minutes, and left for 12 hours or more after dehydration. The initial load and the total fineness × 0.098 × the number of windings × 2 / 1.111 g are applied to the cassette after leaving it, and it is suspended in water and left for 2 minutes. Measure the length of the left casket and set it to L. Furthermore, the test piece is left for 2 minutes in a state where only the initial load is excluded, and the length of the casket is measured to obtain L1. L and L1 were measured at three points by changing the sample, and after obtaining the expansion / contraction recovery rate (CR2) by the following formula, an average value was taken.
Expansion / contraction rate (CR2) (%) = {(L−L1) / L} × 100.

(10) Spinnability The yarn breakage per ton is shown according to the following criteria.
◎ (excellent): thread breakage less than 1.0 times,
○ (good): thread breakage of 1.0 or more and less than 4.0 times,
Δ (poor): thread breakage 4.0 or more and less than 7.0 times,
X (impossible): Thread breakage 7.0 times or more or yarn production is impossible.

(11) False twist processability Calculate the calculated yarn breakage by totaling the 2kg winding when the obtained fiber is false twisted, the unraveling breakage per 100 pieces, and the twisting breakage during false twisting. The determination was made in the following three stages.
○ (Good): Less than 10% of processed thread breakage Δ (Inferior): 10% or more of processed thread breakage, less than 30% × (Not possible): 30% or more of processed thread breakage

(12) Texture evaluation (soft feeling)
The twisted yarn made by processing the obtained fiber is knitted in a cylinder, and the drapeability and softness of the fabric are evaluated by the inspector (10 persons) in an indoor environment at room temperature of 20 ° C and humidity of 60%. Relative evaluation was performed according to the following criteria.
◎ (excellent): Drapability / soft feeling is very good ○ (good): Drapability is inferior but soft feeling △ (inferior): Drapability / soft feeling is inferior × (impossible): Drapability / softness There is no feeling.

(13) Water absorption (Bilec method)
It was measured by JIS L1907 (2010) “Bilec method”. The water absorption height obtained by this measurement was evaluated according to the following criteria.
◎ (excellent): 90 mm or more ○ (good): 65 mm or more and less than 90 mm Δ (inferior): 55 mm or more and less than 65 mm × (impossible): less than 55 mm Evaluation was made according to the following criteria as a comprehensive evaluation.
◎ (excellent): ◯ or ◎ in all items of texture evaluation, water absorption, yarn-making property and processability, and ◎ items having 3 or more items,
○ (good): ○ or ◎ in all items of texture evaluation, water absorption, yarn-making property, workability, and the number of ◎ is 2 or less,
Δ (inferior): one having one or more items of Δ among all items in texture evaluation, water absorption, yarn-making property, workability,
X (impossible): one having one or more x items out of all items in texture evaluation, water absorption, yarn-making property, and workability.

Example 1
A molten polymer is discharged at a spinning temperature of 253 ° C. from a spinneret in which polycaproamide containing 1.9% by weight of titanium oxide at 25 ° C. and 98% sulfuric acid relative viscosity of 2.6 is circularly arranged. A steam jet zone in which steam at 285 ° C. is jetted at a pressure of 0.25 kPa toward the head, and a single cylinder provided downstream of the steam jet zone and having a cooling start position of 30 mm and a vertical length of 300 mm The mold cooling device is allowed to pass through a cooling zone that is cooled by cooling air of 20 ° C. that is radially blown outwardly and is cooled and solidified, and the annular type oil supply guide is positioned 600 mm from the lower surface of the spinneret on the downstream side of the cooling device. Is installed, lubricated, spun at a spinning speed of 4500 m / min, and wound at an equal angular interval of 120 ° as shown in FIG. To obtain a combined filament yarn made of San'yo sectional polycaproamide multifilament and round cross-section which protrudes radially. Using the obtained blended yarn, stretch false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.3 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 2
A polycaproamide multifilament having a six leaf / round cross section is spun in the same manner as in Example 1 except that a 44 dtex / 46 filament mixed yarn having a six leaf / round cross section as shown in FIG. 2 is used. Of mixed yarn was obtained. Using the obtained blended yarn, drawing false twist was performed at a processing speed of 500 m / min, a processing magnification of 1.2 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 3
Spinning was carried out in the same manner as in Example 1 except that a blended yarn consisting of 44 dtex / 34 filaments of six-leaf / round cross section was obtained, and a polycaproamide multifilament blended yarn consisting of six-leaf / round section was obtained. It was. Using the obtained mixed yarn, drawing false twist was performed at a processing speed of 500 m / min, a processing magnification of 1.4 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 4
Polycapro having a six-leaf / round cross section was spun in the same manner as in Example 1 except that the globality LB (average value) of the blended yarn having a six-leaf / round section of 44 dtex / 46 filament was changed. An amide multifilament mixed yarn was obtained. Using the obtained blended yarn, drawing false twist was performed at a processing speed of 500 m / min, a processing magnification of 1.2 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 5
Polycapro having a six-leaf / round cross section was spun in the same manner as in Example 1 except that the globality LB (average value) of the blended yarn having a six-leaf / round section of 44 dtex / 46 filament was changed. An amide multifilament mixed yarn was obtained. Using the obtained blended yarn, stretch false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.3 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 6
Spinning was performed in the same manner as in Example 1 except that the blending ratio of the blended yarn consisting of 44 dtex / 46 filaments of six-leaf / round section was changed, and polycaproamide multifilaments consisting of six-leaf / round section A blended yarn was obtained. Using the obtained mixed yarn, drawing false twist was performed at a processing speed of 500 m / min, a processing magnification of 1.4 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 7
Spinning was performed in the same manner as in Example 1 except that the blending ratio of the blended yarn consisting of 44 dtex / 46 filaments of six-leaf / round section was changed, and polycaproamide multifilaments consisting of six-leaf / round section A blended yarn was obtained. Using the obtained mixed yarn, drawing false twist was performed at a processing speed of 500 m / min, a processing magnification of 1.4 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 8
A polycaproamide multifilament having a six leaf / round cross section is spun in the same manner as in Example 1 except that a 44 dtex / 46 filament mixed yarn having a six leaf / round cross section as shown in FIG. 2 is used. Of mixed yarn was obtained. Using the obtained blended yarn, stretch false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.2 times, a 1HT temperature of 200 ° C., and a 2HT temperature of 190 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Example 9
A polycaproamide multifilament having a six leaf / round cross section is spun in the same manner as in Example 1 except that a 44 dtex / 46 filament mixed yarn having a six leaf / round cross section as shown in FIG. 2 is used. Of mixed yarn was obtained. Using the obtained mixed yarn, drawing false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.2 times, and an 1HT temperature of 180 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Comparative Example 1
Spinning was carried out in the same manner as in Example 1 except that a mixed yarn consisting of a 44 dtex / 30 filament trilobal / round cross section was obtained to obtain a polycaproamide multifilament blending yarn consisting of a trilobal / round cross section. It was. Using the obtained blended yarn, stretch false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.5 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the roval degree LB (average value), the blend ratio, the yarn radius / the length b of the perpendicular, the elongation, 15% stress, and the stretch recovery rate ( CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Comparative Example 2
Spinning was performed in the same manner as in Example 1 except that 44dtex / 46 filament six-leaf / trilobal cross-section was used, and polycaproamide multifilament multi-filament blend yarn consisting of six-leaf / trilobal cross-section. Got. Using the obtained blended yarn, drawing false twist was performed at a processing speed of 500 m / min, a processing magnification of 1.1 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the globality LB (average value), the blend ratio, elongation, 15% stress, expansion / contraction recovery rate (CR2), texture evaluation (soft feeling) , Water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation. The results are shown in Table 1.

Comparative Example 3
The polymer constituting the multifilament is made of polyethylene terephthalate, and the molten polymer is discharged from the die at a spinning temperature of 290 ° C. to obtain a blended yarn consisting of a 6-leaf / round section of 44 dtex / 46 filaments, and a spinning speed of 3000 m / min. Spinning was performed in the same manner as in Example 1 to obtain a mixed yarn of polyethylene terephthalate having a six-leaf / round cross section. Using the obtained blended yarn, stretch false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.5 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polyethylene terephthalate, the number of recesses in the cross-sectional shape, the globality LB (average value), the blend ratio, the yarn radius / vertical length b, the elongation, 15% stress, the expansion / contraction recovery rate (CR2), Texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property, workability and comprehensive evaluation were performed. The results are shown in Table 1.

Comparative Example 4
A polycaproamide multifilament fiber having a round cross section was obtained by spinning in the same manner as in Example 1 except that a fiber having a round cross section of 44 dtex / 46 filament was used. Using the obtained blended yarn, stretch false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.5 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The polycaproamide multifilament was subjected to a single yarn fineness, elongation, 15% stress, stretching / restoring rate (CR2), texture evaluation (soft feeling), water absorption (Bilec method), yarn forming property, workability and comprehensive evaluation. The results are shown in Table 1.

Comparative Example 5
Spinning was carried out in the same manner as in Example 1 except that a mixed yarn consisting of a 44 dtex / 22 filament trilobal / round cross section was obtained to obtain a polycaproamide multifilament blending yarn consisting of a trilobal / round cross section. It was. Using the obtained blended yarn, drawing false twisting was performed at a processing speed of 500 m / min, a processing magnification of 1.7 times, a 1HT temperature of 180 ° C., and a 2HT temperature of 170 ° C. to obtain a false twisted yarn.
The single yarn fineness of the polycaproamide multifilament, the number of recesses in the cross-sectional shape, the globality LB (average value), the yarn radius / perpendicular length b, elongation, 15% stress, expansion / contraction recovery rate (CR2), blending The fineness ratio, texture evaluation (soft feeling), water absorption (Bilec method), yarn-making property and comprehensive evaluation were performed. The results are shown in Table 1.

1 base 2 heat retention zone under base 3 chimney 4 oil supply device 5 interlace nozzle 6 take-up roller 7 draw roller 8 winder (winding device)
DESCRIPTION OF SYMBOLS 9 Fiber filament 10 Textile product package 11 Cooling device that blows cooling air from the inside to the outside 12 Cooling device that blows cooling air to the inside from the outside

Japanese Patent Laid-Open No. 10-266036 Japanese Patent Laid-Open No. 7-34341 JP 2011-74539 A

Claims (6)

A polyamide mixed fiber composed of at least two types of filaments having different cross-sectional shapes dispersed and mixed, wherein the cross-sectional shape perpendicular to the longitudinal direction of at least one type of filaments does not have a recess. The cross-sectional shape in the direction perpendicular to the longitudinal direction of the other filaments is a shape having a recess, and the average fineness of the filaments for each type is in the range of 1.3 dtex or less. Polyamide blended composite yarn. The length b of the perpendicular line dropped from the tangent line that touches two adjacent convex portions across the concave portion of the cross section of the cross-sectional filament having the concave portion to the bottom point of the concave portion formed between the two convex portions, The polyamide mixed fiber composite yarn for false twisting according to claim 1, which has a cross-sectional shape smaller than a yarn radius of a filament having a cross-sectional shape having no recess. The polyamide mixed composite yarn for false twisting according to claim 1 or 2, wherein the cross section of the filament having a concave portion has a global degree LB of 5 or more and 60 or less. The polyamide mixed composite yarn for false twisting according to any one of claims 1 to 3, wherein a cross-sectional ratio of the filament having a cross-sectional shape having a recess and the other filament is 30 to 70%. A false twisted yarn obtained by false twisting the polyamide mixed composite yarn for false twist according to any one of claims 1 to 4. The false twisted yarn according to claim 5, wherein the expansion / contraction recovery rate (CR2) is 5 to 20%.

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