Fiber splitting yarn with excellent cross-section formation properties and method for manufacturing the same

Abstract

The present invention relates to a split yarn with excellent cross-section formation properties and a method for producing the same. The split yarn according to the present invention has excellent splitting workability, and the filaments produced from the split yarn have excellent cross-section formation properties, and the cross-sectional shape of the filaments can be uniform and diverse, and the filaments have excellent cross-section formation and can have irregular cross-sections, so it is possible to provide a fabric with improved feel and gloss. Furthermore, the method for producing the split yarn according to the present invention has excellent splitting workability, and the defect rate can be reduced, which is advantageous in the process. [Solution] The split yarn with excellent cross-section formation is a split yarn (Mother Yarn) containing multiple filaments, wherein at least one filament contains a soluble polymer and an insoluble polymer.

Description

【Technical Field】 【0001】 The present invention relates to a fibrillated yarn having excellent cross-section forming properties and a method for producing the same. More specifically, the fibrillated yarn is excellent in fibrillating workability and cross-section forming properties, and after fibrillating and dissolving the fibrillated yarn, the cross-sectional shape of the filament is uniform and can be diverse, and can have a deformed cross-section, and can provide a fabric with improved touch and gloss. The present invention also relates to a method for producing a fibrillated yarn that is excellent in fibrillating workability, has a reduced defect rate, and is advantageous in the process. 【Background Art】 【0002】 Generally, in the fiber industry, fibrillated yarns are highly regarded from the perspective of being a differentiated material with high added value, and research on imparting various functions to fibrillated yarns is also actively carried out. Fibrillated yarns are mainly used for curtain fabrics, Korean traditional clothing fabrics, cushion materials, carpets, and industrial fabrics. 【0003】 Generally, monofilaments made of polyester or the like with a fineness of about 10 to 50 de require a lot of attention to obtain a uniform cooling and solidification process during spinning depending on their thickness. The manufacturing methods of monofilaments mainly include a method of manufacturing a mother yarn (fibrillated yarn, Mother Yarn) having 6 to 20 strands in the spinning process and then further fibrillating it into 1 strand, and a method of manufacturing a single-strand monofilament in the spinning process. In the latter case, although a difficult process such as fibrillating is not required, when processing the monofilament such as false twisting or dyeing, the processing is performed on a single-strand monofilament, so there is a problem that the processing efficiency and productivity are low. 【0004】 While split yarn undergoes a special process called the splitting process, manufacturing monofilaments with irregular cross-sections can improve tactile feel and luster. However, due to the characteristics of the cross-section, the frequency of yarn breakage increases due to increased friction area between monofilaments and twisting during the splitting process, significantly worsening the workability of the splitting process. As a result, the cross-sectional shapes of monofilaments have been limited to circular and triangular shapes. Therefore, a strategy is needed to manufacture split yarns with circular and triangular cross-sections for each individual filament, while ensuring that the cross-section of the monofilament obtained by splitting and dissolving the split yarn is irregular. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Korean Registered Patent Publication No. 10-0845096 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 The present invention was made to overcome the problems described above, and the primary problem to be solved in the present invention is to provide a splitting yarn that is excellent in splitting workability and cross-section formation. 【0007】 The second problem to be solved in the present invention is to provide filaments with a uniform cross-section and diverse cross-sectional shapes, and a fabric containing them that has excellent tactile properties and gloss. 【0008】 The third problem that the present invention aims to solve is to provide a method for manufacturing split yarn that has improved splitting workability, excellent workability, a reduced defect rate, and a simple process. 【0009】 The problems that this invention aims to solve are not limited to those mentioned above, and other problems not mentioned can be clearly understood by a person with ordinary skill in the art to which this invention pertains from the following description. [Means for solving the problem] 【0010】 To solve the first problem described above, we provide a mother yarn containing multiple filaments, wherein at least one filament contains a soluble polymer and an insoluble polymer, and which exhibits excellent cross-section formation properties. 【0011】 Furthermore, the number of the multiple filaments may be 2 to 20, and their cross-sections may be circular or triangular. 【0012】 According to one preferred embodiment of the present invention, the coefficient of variation (CV%) of the denier distribution of the plurality of filaments may be 1.6 or less. 【0013】 Furthermore, the soluble polymer may contain at least one component selected from water-soluble components or alkali-soluble components. 【0014】 Furthermore, the content ratio of the insoluble polymer and the soluble polymer may be 90:10 to 30:70. 【0015】 Furthermore, at least a portion of the soluble polymer may be exposed to the outside of the filament. 【0016】 Furthermore, the cross-sectional shape of the filament after filament separation may differ from the cross-sectional shape of the filament after dissolution. 【0017】 Furthermore, the aforementioned fiber-divided yarn can satisfy the following conditions (1), (2), (3), (4), and (5). 【0018】 (1) 60de ≤ Total fineness of the divided yarn ≤ 500de (2) Filament strength after yarn growth ≤ 3.0 g / de ≤ 5.0 g / de (3) 20% ≤ filament elongation after yarn ≤ 40% (4) 3.0 g / de ≤ filament strength after dissolution ≤ 5.5 g / de (5) 15% ≤ filament elongation after melting ≤ 35% To solve the second problem described above, the present invention provides a filament in which a soluble polymer is dissolved in the filament separated from the fiber-divided yarn, and provides a fabric containing the separated filament or the dissolved filament. 【0019】 To solve the third problem described above, the present invention provides a method for producing a filament yarn with excellent cross-sectional properties, comprising: a first step of preparing an insoluble polymer and a soluble polymer; a second step of spinning the filament through a composite spinneret with a content ratio of the insoluble polymer and the soluble polymer of 90:10 to 30:70 to produce an undrawn filament yarn; and a third step of drawing the spun undrawn filament yarn, wherein the filament has multiple filaments, and at least one of the filaments contains an insoluble polymer and a soluble polymer. [Effects of the Invention] 【0020】 The splitting yarn according to the present invention has excellent workability in splitting, excellent cross-sectional formation of filaments produced by the splitting yarn, and the cross-sectional shape of the filaments can be uniform and diverse, and because it has excellent cross-sectional formation of filaments and can have irregularly shaped cross-sections, it is possible to provide a fabric with improved feel and luster. 【0021】 Furthermore, the method for manufacturing split yarn according to the present invention is advantageous in the process because it offers excellent workability in splitting the yarn and reduces the defect rate. 【0022】 The effects of the present invention are not limited to those described above, but should be understood to include all effects that can be inferred from the configuration of the invention as described in the description or claims. 【Brief Description of the Drawings】 【0023】 [Figure 1] This is a photograph image of the cross-section of a split fiber according to a preferred embodiment of the present invention, which is spun using a 4-division type composite spinneret. [Figure 2] This is a photograph image of the cross-section of a split fiber according to a preferred embodiment of the present invention, which is spun using a 4-blade type composite spinneret. [Figure 3] This is a photograph image of the cross-section of a split fiber according to a preferred embodiment of the present invention, which is spun using a windmill type composite spinneret. [Figure 4] This is a photograph image of the cross-section of a split fiber according to a preferred embodiment of the present invention, which is spun using an 8-division type composite spinneret. 【Modes for Carrying Out the Invention】 【0024】 Hereinafter, referring to the accompanying drawings, embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The present invention can be embodied in various different forms and is not limited to the embodiments described here. In the drawings, in order to clearly explain the present invention, parts not directly related to the explanation are omitted, and the same or similar components throughout the present specification are denoted by the same reference numerals. 【0025】 The terms used in this specification are those used to describe specific embodiments and are not intended to limit the present invention. Terms expressed in the singular form include the plural form as well, unless the context clearly indicates a different meaning. In this application, terms such as "comprising" or "having" indicate the presence of the features, numbers, steps, operations, components, or combinations thereof described in the specification, and should be understood not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, or combinations thereof in advance. 【0026】 Unless otherwise specified, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the present invention pertains. Terms as defined in commonly used dictionaries should be interpreted in a way that is consistent with their contextual meaning in the relevant art, and not in an ideal or overly formal sense unless explicitly defined herein. 【0027】 In this specification, "filament after filamentation" means a filament that has been separated by applying a filamentation process to a filamented yarn. 【0028】 Hereinafter, in this specification, "dissolved filament" means the filament after the soluble polymer component has been dissolved (reduced) in the filament that has been separated through the filament separation process. 【0029】 In this specification, "weight reduction" means that a soluble polymer is dissolved by a weight reduction solution. 【0030】 In this specification, "weight-reducing solution" means a solution that can dissolve (reduce the weight of) soluble polymers contained in the fiber division yarn. 【0031】 As mentioned above, when filaments contained in split yarn are manufactured with irregular cross-sections, the tactile feel and luster can be improved through the cross-sectional shape. However, due to the characteristics of the cross-section, there is a problem in that the workability of the splitting process is greatly deteriorated due to an increase in the friction area between monofilaments and the generation of twist during the splitting process. Currently, the cross-sectional shape of monofilaments is limited to shapes that do not cause the aforementioned problems, such as circular and triangular cross-sections. Therefore, while manufacturing the filaments constituting the split yarn with cross-sectional shapes that do not cause the aforementioned problems, such as circular and triangular cross-sections, it is necessary to devise a method so that the cross-section of the monofilament obtained by splitting and dissolving the split yarn is different from the cross-section of the filament after splitting. 【0032】 Therefore, the present invention seeks to solve the above-mentioned problems by providing a mother yarn 100 containing a plurality of filaments, wherein at least one or more filaments contain a soluble polymer 102 and an insoluble polymer 101, and the mother yarn 100 has excellent cross-section formation properties. A mother yarn 100 having filaments containing both a soluble polymer 102 and an insoluble polymer 101 can be spun into a circular or triangular cross-section, and the soluble polymer 102 of the filaments after the mother yarn 100 has been separated can be dissolved without worsening the yarn separation workability, thereby providing filaments with diverse cross-sectional shapes. As a result, a fabric containing such filaments can have excellent tactile properties and luster. 【0033】 Specifically, referring to Figures 1 to 4, the fiber division yarn 100 of the present invention comprises a plurality of filaments, and at least one of these filaments contains a soluble polymer 102 and an insoluble polymer 101. 【0034】 The aforementioned plurality of filaments may include 2 to 20 filaments in the split yarn 100, preferably 6 to 20 filaments. The number of filaments refers to the number of filaments produced after the splitting process in the split yarn 100. If the number of filaments exceeds 20, the insoluble polymer 101, which is a fiber-forming component, changes to a finer fineness, and the contact surface area with the weight-reducing liquid increases, which may reduce chemical resistance and increase the risk of twisting between filaments. This can significantly reduce the passability through the splitting process, potentially leading to a significant increase in losses when the yarn breaks once, and thus increasing manufacturing costs. On the other hand, if the number of filaments is less than 6, the production volume decreases significantly during the splitting process, which may increase manufacturing costs and worsen economic efficiency. 【0035】 The cross-sections of the aforementioned plurality of filaments may be circular or triangular. If the cross-sections are limited to circular or triangular, sufficient yarn separation processability can be ensured. However, if the cross-sections are not circular or triangular, the friction area between each filament in the yarn 100 increases, which may cause twisting during the yarn separation process and significantly worsen the yarn separation processability. 【0036】 The filament contains both the soluble polymer 102 and the non-soluble polymer 101 inside at least one of them. 【0037】 When a soluble polymer 102 is added to the interior of the filament, the soluble polymer can be dissolved (reduced in volume) using a volume-reducing solution described later to produce a filament with an irregular cross-section, thereby enabling the production of a fabric containing a filament with an irregular cross-section. Since this fabric has an irregular cross-section different from circular or triangular cross-sections, it can have an excellent tactile feel and a better gloss than conventional fabrics. 【0038】 The soluble polymer 102 may contain at least one component selected from water-soluble components or alkali-soluble components. The water-soluble or alkali-soluble components that can be used in the present invention are not limited to those commonly used in the textile field; however, the present invention does not particularly limit them. 【0039】 Specific examples of water-soluble components include polyethylene oxide, polypropylene oxide, and water-soluble polyalkylene oxides such as ethylene oxide-propylene oxide copolymers; neutralized products of (meth)acrylamide-(meth)acrylic acid copolymers; and monopolymers of (meth)acrylamide. The copolymer may be a block copolymer or a random copolymer. In addition, as the propylene oxide constituting the polypropylene oxide, 1,2-propylene oxide or 1,3-propylene oxide can usually be used, and both can be used in combination. 【0040】 Furthermore, specific examples of alkali-soluble components include polylactic acid, ultra-high molecular weight polyalkylene oxide condensation polymers, esterification reaction products obtained by reacting acid components and diol components, including aromatic polycarboxylic acids having 6 to 14 carbon atoms and sodium 3,5-dicarbomethoxybenzenesulfonate; and copolyesters polycondensed with polyethylene glycol. 【0041】 At least a portion of the soluble polymer 102 may be exposed to the outside of the filament. Referring to Figures 1 to 4, it can be seen that a portion of the soluble polymer 102 is exposed to the outside of the filament. If at least a portion is not exposed to the outside, the soluble polymer 102 cannot come into contact with the solution in the liquid reducer, which may lead to a significant decrease in the dissolution rate and dissolution uniformity. 【0042】 The soluble polymer 102 can be dissolved (reduced in volume) by a volume-reducing solution, and this solution can be used without particular limitations as long as it is a solution that can reduce the volume of the soluble polymer 102. Preferably, if the soluble polymer 102 is a water-soluble polymer, the volume-reducing solution is water, and the usable water is usually purified water such as deionized water or pure water, but depending on the application of the water-soluble polymer composition, tap water or industrial water may also be used. Preferably, if the soluble polymer 102 is an alkali-soluble polymer, the volume-reducing solution may be an alkaline solution, but the type of alkaline solution may vary depending on the specific conditions of the volume-reducing process, such as the temperature of the alkaline solution and whether or not additives are added to increase the volume-reducing rate, and is not particularly limited in the present invention. More preferably, an aqueous sodium hydroxide solution can be used. The concentration of the aqueous sodium hydroxide solution is not particularly limited, but is preferably 0.1 to 20% by weight. 【0043】 The insoluble polymer 101 can be any polymer commonly used as a split yarn 100 in the industry, and preferably contains one or more polyester components or polyamide components. More preferably, if it is a polyester component, it may contain one or more components selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyhexylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene-1,2-bis(phenoxy)ethane-4,4'-dicarboxylate, polyethylene isophthalate / terephthalate copolymer, polybutylene terephthalate / isophthalate copolymer and polybutylene terephthalate / decane-dicarboxylate copolymer, or if it is a polyamide component, it may contain one or more components selected from the group consisting of nylon 6, nylon 66, nylon 6.10 and aramid. 【0044】 In a preferred embodiment of the present invention, the content ratio of the non-soluble polymer 101 and the soluble polymer 102 contained in the divided yarn 100 may be 90:10 to 30:70, and preferably 80:20 to 50:50. If the ratio deviates from the above, the molten polymer may bend as it passes through the spinneret, potentially leading to poor extrusion. Specifically, if the content ratio of the non-soluble polymer 101 exceeds 90, the flowability of the soluble polymer 102 may be poor due to the decrease in the content of the soluble polymer 102, potentially causing problems with cross-sectional variation. This can result in improper distribution of the soluble polymer 102 on the cross-section, potentially leading to poor cross-sectional formation after dissolution. If the content ratio of the insoluble polymer 101 is less than 30, the decrease in the content of the insoluble polymer 101, which is a cross-section forming component, reduces the strength and elongation of the split yarn 100, the filaments after splitting, and the filaments after dissolution, resulting in fabric defects. Furthermore, the decrease in the content of the insoluble polymer 101 may lead to insufficient flowability of the insoluble polymer 101, potentially causing problems with cross-sectional variation. 【0045】 The coefficient of variation (CV%) of the denier distribution of the multiple filaments may be 1.6 or less, and preferably between 0.5 and 1.6. In this case, the CV% value of the denier distribution indicates the extent to which the expansion of the denier distribution (deviation of denier) is relative to the mean value (arithmetic mean denier), and is calculated by CV% = (standard deviation / mean value) * 100. If the CV% value exceeds 1.6, the range of denier distribution of the filaments widens, and the physical properties of each filament may change. This makes it difficult to control the physical properties of the fabric produced with the filaments, makes it difficult to make the cross-section of the filaments uniform after melting, makes it difficult to control the shape of the cross-section, and can result in uneven thickness between each filament and a significant decrease in yarn separation. If the CV% value is less than 0.5, further equipment and processes are required to reduce the coefficient of variation, which increases manufacturing costs, but can result in the problem that the difference in quality is not large. Furthermore, when adjusting the content ratio of the insoluble polymer 101 and the soluble polymer 102, the flowability of the polymer with a lower content is improved, and cross-sectional variation can be reduced, which may be advantageous in reducing the CV value. 【0046】 Next, we will describe the cross-section and physical properties of the divided yarn 100. 【0047】 The filament division yarn 100 may have different cross-sectional shapes after division and after dissolution. Specifically, the cross-section of the filament after division may be circular or triangular, and the cross-section of the filament after dissolution may be other shapes, preferably four-part, four-bladed, windmill, or eight-part. In the filament after division, the soluble polymer 102 portion can be filled using a composite spinning method into the portion other than the cross-section forming component (insoluble polymer), thereby achieving a circular or triangular cross-section in the filament after division. Since the cross-section of the filament after division is circular or triangular, the workability of the division process can be improved. Subsequently, by dissolving (reducing the volume) the soluble polymer 102 portion with a volume-reducing solution, the filament after dissolution can be formed with a cross-section other than a circular or triangular cross-section, and a fabric with excellent feel and gloss can be obtained. 【0048】 The total fineness of the split yarn 100 may be 60 to 500 de, preferably 80 to 400 de. If the total fineness of the split yarn 100 is less than 60 de, the low single-fiber fineness may result in very poor passage through the splitting process. If the fineness exceeds 500 de, the single-fiber fineness becomes coarse, which may prevent sufficient solidification in the quenching chamber of a typical spinning machine, resulting in very poor spinning performance and potentially significant dyeing abnormalities due to incomplete stretching. 【0049】 The single filament fineness of the filaments after separation may be 5 to 50 de, and preferably 8 to 30 de. If the single filament fineness of the filaments after separation is less than 5 de, the weaving performance may be very poor, and the fabric may have low strength after weaving, resulting in problems with easy tearing. If the single filament fineness of the filaments after separation exceeds 50 de, solidification may not occur sufficiently, leading to poor dyeing of the fabric, uneven single filament fineness, and insufficient weaving passability. 【0050】 The strength of the filament after separating the aforementioned split yarn 100 may be 3.0 to 5.0 g / de. If the strength is less than 3.0 g / de, not only is the spinnability poor, but the chemical resistance decreases, and damage to the insoluble polymer 101 may occur during the dissolution process. Furthermore, the tear strength on the fabric is poor, which may lead to tearing and fraying. If the strength exceeds 5.0 g / de, the rate of weight loss of the soluble polymer 102 decreases, which prolongs the dissolution process and may result in increased process costs and embrittlement of the insoluble polymer 101. 【0051】 The elongation of the filament after separating the fiber-divided yarn 100 may be 20-40%. If the elongation is less than 20%, the rate of weight loss of the soluble polymer 102 decreases, which can lengthen the dissolution process, increase process costs, and cause embrittlement of the insoluble polymer 101. If the elongation exceeds 40%, dyeing may not proceed smoothly due to uneven stretching, and the noncrystalline portion may increase significantly due to insufficient stretching of the insoluble polymer 101, which is a fiber-forming component, leading to decreased chemical resistance and potential damage to the insoluble polymer 101 during the dissolution process. 【0052】 The strength of the filament after dissolving the aforementioned split yarn 100 may be between 3.0 and 5.5 g / de. If the strength of the filament after dissolution is less than 3.0 g / de, the tear strength on the fabric will be poor, and there is a risk of tearing or fraying. If the strength of the filament after dissolution exceeds 5.5 g / de, the fabric may be relatively stiff and have an inferior feel. 【0053】 Although the filamented yarn 100 contains a soluble polymer 102 whose strength is relatively weaker than that of the insoluble polymer 101, if the soluble portion dissolves during the process and a certain portion disappears, the content ratio of the insoluble polymer 101 increases, and the strength of the filament after dissolution may increase compared to the filament after filamentation. 【0054】 The elongation of the filament after dissolving the fiber-divided yarn 100 may be 15-35%. Prolonged exposure to high temperatures during the dissolution process may reduce the elongation compared to the elongation of the filament before fiber division. If the elongation of the filament after dissolution is less than 15%, it will be disadvantageous in terms of process passability during weaving and dyeing, and defects such as tearing of the yarn may occur on the fabric. If the elongation of the filament after dissolution exceeds 35%, dyeing abnormalities due to incomplete stretching of the non-soluble polymer 101, which is a fiber-forming component, and horizontal stripes due to uneven cross-section may occur. 【0055】 Furthermore, the aforementioned split yarn 100 may be a false-twist split yarn 100 that has gone through a false-twist process (DTY) and then passed through a split yarn process. When the split yarn 100 goes through a false-twist process, it can exhibit a soft texture and volume similar to natural fibers, making it easier to manufacture as a highly sensitive, high-value-added product. 【0056】 To solve the above-mentioned problems, the present invention provides a filament in which the soluble polymer 102 is dissolved in the filament separated from the fiber-divided yarn 100 (filament after separation). 【0057】 The yarn splitting may be carried out through a yarn splitting process, which may include all of the usual general yarn splitting processes, preferably a false-twist yarn splitting process, and preferably a DTY (Draw Textured Yarn) process among the false-twist processes. 【0058】 Furthermore, the dissolution step can be carried out using the reduction solution described above. The dissolution step may be carried out immediately before the dyeing step described later, but the order is not limited to this. Through the dissolution step, the cross-section of the filament after filamentation changes from a circular or triangular cross-section to an irregular cross-section, which can improve the tactile feel and enhance the gloss. 【0059】 To solve the above-mentioned problems, a fabric containing the separated filaments (filaments after separation) or dissolved filaments (filaments after dissolution) is provided. 【0060】 The fabric may be woven or knitted, although it is not particularly limited in type. If the fabric is woven, it may be a woven fabric made using the filaments as warp or weft threads. Preferably, the weaving may be carried out in any one of the following ways: plain weave, twill weave, satin weave, or double weave. The density of the warp and weft threads is not particularly limited. If the fabric is knitted, it may be a knitted fabric made including the filaments. Preferably, the knitting may be ordinary weft knitting or warp knitting. 【0061】 The aforementioned fabric can be manufactured by weaving or knitting the filaments after yarn separation, followed by processing steps such as fabric manufacturing and pretreatment, dyeing, and washing. However, a dissolution step can be added immediately before dyeing to form the target cross-section, and by dyeing and final processing the fabric after the dissolution and washing steps, a fabric with a uniquely shaped cross-section can be provided. However, the aforementioned processing steps are not necessarily required, and the order of the dissolution step is not limited to immediately before dyeing. 【0062】 To solve the above-mentioned problems, a method for producing a filamentous yarn 100 with excellent cross-sectional properties is provided, comprising: a first step of preparing an insoluble polymer 101 and a soluble polymer 102; a second step of spinning the filamentous yarn 100 through a composite spinneret with a content ratio of the insoluble polymer 101 and the soluble polymer 102 of 90:10 to 30:70; and a third step of stretching the spun unstretched filamentous yarn 100. The filamentous yarn has multiple filaments, and at least one of the filaments contains the insoluble polymer 101 and the soluble polymer 102. 【0063】 The non-soluble polymer 101 and the soluble polymer 102, as well as their content ratios, are as described above and will therefore be omitted. 【0064】 The aforementioned undrawn split yarn 100 can be used without limitation as long as it is drawn using a drawing method commonly used in the industry; therefore, the present invention does not particularly limit it. 【0065】 As described above, the multiple filaments and the non-soluble polymer 101 and soluble polymer 102 constituting these filaments are as described, and therefore their specific details will be omitted. 【0066】 The manufacturing method for the split yarn 100 may include a false twisting step, and preferably, the false twisting step may include a DTY (Draw Textured Yarn) step. The false twisting step of the split yarn 100 may be performed before the splitting step, and when the split yarn 100 passes through the false twisting step, it can exhibit a soft feel and volume similar to natural fibers, so it can be manufactured as a highly sensitive, high-value-added product. 【0067】 The present invention will be described in more detail by the following examples, but these examples are not intended to limit the scope of the present invention and should be interpreted as being helpful in understanding the present invention. 【0068】 <Examples> Example 1: Production of 100 four-part split yarns, filaments after splitting, and filaments after dissolution. For the non-soluble polymer 101, TORAY's SD (SemiDull) was prepared, and for the soluble polymer 102, TORAY's alkali-easily soluble ESP (Easy Soluble Polyester) was prepared. A four-part composite spinning nozzle was used, and the ratio of non-soluble polymer 101 to soluble polymer 102 was divided at 7:3. The spinning speed was fixed at 4000 MPM (meters per minute). By performing drawing under conditions that ensured good yarn uniformity and no dyeing defects, a split yarn 100 (Figure 1) was produced with a fineness of 200 de, containing 10 filaments, and having a circular cross-section for the filaments before splitting. 【0069】 Subsequently, after winding 10 kg of each of the separated yarns 100, an automatic yarn splitting machine, model DY-101 from Dae Young Industry, was used. The unwinding tension was applied at less than 20 cN, and the yarn was split into 1 kg strands at a speed of 600 MPM, thereby producing filaments with a four-part cross-section after splitting. 【0070】 The separated filaments were fed into a sock knitting machine to produce a knitted fabric, and then dissolved in a 1% by weight sodium hydroxide aqueous solution at atmospheric pressure and 100°C to completely remove the soluble polymer 102 contained in the filaments, thereby producing the filaments after dissolution. 【0071】 Example 2: Production of 100 four-bladed splitting yarns, filaments after splitting, and filaments after dissolution. Except for using a four-blade composite spinning nozzle, the procedure was carried out in the same manner as in Example 1 to produce split yarn 100 (Figure 2), the filament after splitting, and the filament after dissolution. 【0072】 Example 3: Production of windmill-shaped split yarn 100, filaments after splitting, and filaments after melting. Except for using a windmill-type composite spinning nozzle, the procedure was carried out in the same manner as in Example 1 to produce split yarn 100 (Figure 3), the filament after splitting, and the filament after dissolution. 【0073】 Example 4: Production of 8-part split yarn 100, filaments after splitting, and filaments after dissolution. Except for using an 8-segment composite spinning nozzle, the procedure was carried out in the same manner as in Example 1 to produce split yarn 100 (Figure 4), filaments after splitting, and filaments after dissolution. 【0074】 Example 5: Production of 8-part split yarn 100, filaments after splitting, and filaments after dissolution. Except for the fact that the spinneret was an 8-part composite spinneret and the ratio of non-soluble polymer 101 to soluble polymer 102 was 9:1, the procedure was carried out in the same manner as in Example 1 to produce split yarn 100 (Figure 4), filaments after splitting, and filaments after dissolution. 【0075】 <Comparative Example> Comparative Example 1: Production of 100 four-part split filaments, filaments after splitting, and filaments after dissolution. The process was carried out in the same manner as in Example 1, except that the ratio of the insoluble polymer 101 to the soluble polymer 102 was 9.5:0.5, to produce the split yarn 100, the filament after splitting, and the filament after dissolution. 【0076】 Comparative Example 2: Production of 100 four-bladed splitting yarns, filaments after splitting, and filaments after dissolution. Except for the ratio of non-soluble polymer 101 to soluble polymer 102 being 9.5:0.5 and the spindle being a four-blade composite spindle, the process was carried out in the same manner as in Example 1 to produce split yarn 100, split filaments, and dissolved filaments. 【0077】 Comparative Example 3: Production of windmill-type split yarn 100, filaments after splitting, and filaments after dissolution. Except for the ratio of insoluble polymer 101 to soluble polymer 102 being 9.5:0.5 and the spindle being a windmill-type composite spinning spindle, the split yarn 100, the filament after splitting, and the filament after dissolution were produced in the same manner as in Example 1. 【0078】 Comparative Example 4: Production of 100 8-part split filaments, filaments after splitting, and filaments after dissolution. Except for the ratio of insoluble polymer 101 to soluble polymer 102 being 9.5:0.5 and the spindle being an 8-segment composite spindle, the process was carried out in the same manner as in Example 1 to produce split yarn 100, filaments after splitting, and filaments after dissolution. 【0079】 Comparative Example 5: Production of 100 four-part split filaments, filaments after splitting, and filaments after dissolution. The procedure was carried out in the same manner as in Example 1, except that the ratio of non-soluble polymer 101 to soluble polymer 102 was 2:8, to produce the split yarn 100, the filament after splitting, and the filament after dissolution. 【0080】 Comparative Example 6: Production of 100 four-bladed splitting yarns, filaments after splitting, and filaments after dissolution. Except for the ratio of insoluble polymer 101 to soluble polymer 102 being 2:8 and the spinneret being a four-blade composite spinneret, the procedure was carried out in the same manner as in Example 1 to produce split yarn 100, filaments after splitting, and filaments after dissolution. 【0081】 Comparative Example 7: Production of windmill-type split yarn 100, filaments after splitting, and filaments after dissolution. Except for the ratio of insoluble polymer 101 to soluble polymer 102 being 2:8 and the spindle being a windmill-type composite spinning spindle, the same procedure as in Example 1 was followed to produce split yarn 100, split filaments, and dissolved filaments. 【0082】 Comparative Example 8: Production of 100 eight-part split filaments, filaments after splitting, and filaments after dissolution. Except for the ratio of insoluble polymer 101 to soluble polymer 102 being 2:8 and the spinneret being an 8-segment composite spinneret, the procedure was carried out in the same manner as in Example 1 to produce split yarn 100, filaments after splitting, and filaments after dissolution. 【0083】 <Example of experiment> Experimental Example 1: Evaluation of CV% values ​​of fineness distribution The fineness of the filaments after each spinning was measured, and the coefficient of variation (CV%) of the measured fineness distribution was calculated. The CV% (coefficient of variation) value indicates the extent to which the expansion of the fineness distribution (deviation of fineness) is relative to the mean (arithmetic mean fineness), and is calculated as CV% = (standard deviation / mean) * 100. The fineness of the filaments after spinning was measured for Examples 1-5 and Comparative Examples 1-8, and the results are shown in Tables 1 and 2. 【0084】 [Table 1] 【0085】 [Table 2] 【0086】 Analyzing the results with reference to Table 1, it was confirmed that the closer the content ratio of insoluble polymer 101 to soluble polymer 102, the better the yarn splitting workability and the lower the CV value. Specifically, while Example 1, Comparative Example 1, and Comparative Example 5 are examples where the nozzle type is a four-part type, in Example 1, where the content ratio of insoluble polymer 101 to soluble polymer 102 was the most similar, the CV% value was 7.5, while in Comparative Example 5, where the difference between the content ratios was even greater, the CV% value was 16.4, and in Comparative Example 1, where the difference was even greater, the CV% value was 18.4. The same was true for Example 2, Comparative Example 2, and Comparative Example 6, where the nozzle type is a four-blade type, Example 3, Comparative Example 3, and Comparative Example 7, where the nozzle type is a windmill type, and Example 4, Comparative Example 4, and Comparative Example 8, where the nozzle type is an eight-part type. In other words, it was found that when the content ratio of insoluble polymer 101 to soluble polymer 102 falls within the range of 90:10 to 30:70, the cross-section formation is excellent. 【0087】 As explained with reference to Table 2, in Examples 4 and 5, the content ratios are between 90:10 and 30:70. However, in Example 5, the proportion of insoluble polymer 101 is higher than in Example 4, so the content ratio is skewed towards insoluble polymer 101, and it was confirmed that the CV% value is high. As a result, in Example 5, the cross-section was non-uniform and the filamentation properties were not as good as in Example 4. 【0088】 Experimental Example 2: Evaluation of Dissolution Time To evaluate the dissolution rate of the soluble polymer 102 in the filaments after yarn separation produced in Examples 1-4 and Comparative Examples 1-8, the filaments after yarn separation were fed into a sock knitting machine to produce knitted fabric. The fabric was then dissolved in a 1% by weight sodium hydroxide aqueous solution at atmospheric pressure and 100°C, and the time required for the soluble polymer 102 contained in the filaments to be completely removed was measured. The results are shown in Table 3. 【0089】 [Table 3] 【0090】 Referring to Table 3, analysis of the results revealed differences in dissolution time depending on the type of nozzle and the content of soluble polymer 102. It can be confirmed that as the content ratio of soluble polymer 102 increases, there is more soluble polymer 102 in the filament, and it takes longer for the soluble polymer 102 to dissolve with the reduction solution. For example, comparing Example 1, Comparative Example 1, and Comparative Example 5, which were manufactured with a four-part nozzle, Comparative Example 1, which had the least amount of soluble polymer 102, had the shortest dissolution time at 17 minutes, while Comparative Example 5, which had the most soluble polymer 102, had the longest dissolution time at 41 minutes. 【0091】 Furthermore, it was confirmed that when the number of externally exposed soluble polymers 102 within the cross-section increases, the contact area between the reduction solution and the soluble polymers 102 increases, and the soluble polymers 102 tend to dissolve even faster. For example, in Example 1, which used a 4-segment nozzle, the number of externally exposed soluble polymers 102 within the cross-section was 4, and the dissolution time was 26 minutes. In contrast, in Example 4, which used an 8-segment nozzle, the number of externally exposed soluble polymers 102 within the cross-section was 8, and the dissolution time was shorter than in Example 1, at 22 minutes. This confirms that when the number of externally exposed soluble polymers 102 increases, the dissolution process becomes easier, and when there are no externally exposed soluble polymers 102, the dissolution rate and dissolution uniformity may decrease significantly. 【0092】 Experimental Example 3: Evaluation of yarn handling efficiency In Examples 1-5 and Comparative Examples 1-8, 10 kg of the split yarn 100 was wound up in each case. Then, using a Dae Young Industry DY-101 splitting machine, a release tension of less than 20 cN was applied, and the yarn was split in 1 kg increments into 10 strands at a speed of 600 MPM. This was repeated 10 times for each case, and the splitting efficiency was calculated as the average number of yarn breaks during 10 splitting cycles. The results are shown in Tables 4 and 5. 【0093】 [Table 4] 【0094】 [Table 5] 【0095】 Analyzing the results with reference to Table 4, it was confirmed that Comparative Examples 1-4 had slightly worse yarn separation workability compared to Examples 1-4 for each spindle, and that Comparative Examples 5-8 had a sharply worse yarn separation workability compared to the Examples. It was confirmed that the yarn separation workability improved as the content ratio of non-soluble polymer 101 and soluble polymer 102 became more similar to each other. This is because when the polymer ratio is heavily skewed to one side in the composite spinning process, there is insufficient amount of the low-ratio polymer to be sufficiently formed in the cross-section, resulting in insufficient cross-section formation. 【0096】 For example, comparing Example 1, which uses a four-part nozzle, with Comparative Examples 1 and 5, it was found that Example 1 had similar content levels of the non-soluble polymer 101 and the soluble polymer 102, resulting in fewer instances of thread breakage. In contrast, Comparative Examples 1 and 5 had a higher content level of one of the polymers compared to the others, resulting in more instances of thread breakage. 【0097】 As explained in Table 5, even when the content ratio of insoluble polymer 101 to soluble polymer 102 was between 90:10 and 30:70, it was confirmed that the fineness distribution CV% value decreased as the content of insoluble polymer 101 and soluble polymer 102 became more similar to each other, thereby improving the workability of the yarn. 【0098】 Although embodiments of the present invention have been described above, the concept of the present invention is not limited to the embodiments shown herein. Those skilled in the art who understand the concept of the present invention can easily propose other embodiments by adding, changing, deleting, or adding components within the same concept, and these are also included within the scope of the present invention. [Explanation of symbols] 【0099】 100-minute fine yarn 101 Non-soluble polymers 102 Solubility Polymers

Claims

[Claim 1] A Mother Yarn containing multiple filaments, A filamentous yarn with excellent cross-section-forming properties, wherein at least one filament contains a soluble polymer and a non-soluble polymer. [Claim 2] The split filament yarn with excellent cross-section-forming properties according to claim 1, characterized in that the number of the plurality of filaments is 2 to 20. [Claim 3] The filamentous yarn with excellent cross-section-forming properties according to claim 1, characterized in that the cross-sections of the plurality of filaments are circular or triangular. [Claim 4] The split filament yarn with excellent cross-section-forming properties according to claim 1, characterized in that the coefficient of variation (CV%) of the fineness distribution of the plurality of filaments is 1.6 or less. [Claim 5] The soluble polymer is characterized by containing at least one component selected from water-soluble components or alkali-soluble components, as described in claim 1, which is a split filament yarn with excellent cross-section-forming properties. [Claim 6] The split filament yarn with excellent cross-section formation properties according to claim 1, characterized in that the content ratio of the non-soluble polymer and the soluble polymer is 90:10 to 30:

70. [Claim 7] The filament yarn with excellent cross-section-forming properties according to claim 1, characterized in that at least a portion of the soluble polymer is exposed to the outside of the filament. [Claim 8] The aforementioned fiber-divided yarn is characterized in that the cross-sectional shape of the filament after division differs from the cross-sectional shape of the filament after dissolution, as described in claim 1, and is excellent in cross-sectional shape formation. [Claim 9] The aforementioned fiber-divided yarn is characterized by satisfying the following conditions (1), (2), (3), (4), and (5), as described in claim 1, and is a fiber-divided yarn with excellent cross-sectional formation properties. (1) 60 de ≤ Total fineness of the divided yarn ≤ 500 de (2) 3.0 g / de ≤ filament strength after filament (3) 20% ≤ filament elongation after yarn ≤ 40% (4) 3.0 g / de ≤ filament strength after dissolution ≤ 5.5 g / de (5) 15% ≤ filament elongation after melting ≤ 35% [Claim 10] A filament in which a soluble polymer is dissolved in a filament separated from a filament separated from the filament separated according to claim 1. [Claim 11] A fabric comprising the filament described in claim 10. [Claim 12] The first step involves preparing an insoluble polymer and a soluble polymer, The second step involves spinning the yarn through a composite spinneret with a content ratio of the insoluble polymer and soluble polymer of 90:10 to 30:70 to produce undrawn split yarn. This includes a third step of drawing the spun, undrawn fiber, A method for producing a split filament with excellent cross-sectional properties, comprising multiple filaments, wherein at least one of the filaments contains a non-soluble polymer and a soluble polymer.

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