Modified cross-section polyethylene yarn and functional fabric containing the same

Abstract

The present invention relates to a modified cross-section polyethylene raw yarn and a functional fabric containing the same, more specifically to a modified cross-section polyethylene raw yarn that can be used to produce a fabric having a cool feeling and sweat absorbing and quick drying properties, and a functional fabric containing the same. The polyethylene raw yarn according to the present invention includes filaments including a central body and two or more protrusions protruding from the central body, based on a cross section perpendicular to the longitudinal direction, and has a crystallinity of 56 to 85%.

Description

[Technical Field]

[0001] The present invention relates to a modified cross-section polyethylene yarn and a functional fabric containing the same, and more particularly to a modified cross-section polyethylene yarn that can be used to produce a fabric having a cool feeling and sweat-absorbing and quick-drying properties, and a functional fabric containing the same. [Background technology]

[0002] Recently, the textile industry has been researching not only the improvement of polymers that make up fibers but also the differentiation of cross-sections of raw yarns as part of the development of differentiated materials with high added value. Of these, differentiation of cross-sections of raw yarns is being actively researched because it is highly effective in improving fiber properties compared to the investment time and cost.

[0003] Meanwhile, as living standards have improved recently, people of all ages are engaging in a variety of sports activities to maintain their health. As a result, the demand for sportswear has increased, and the development of a variety of sportswear has been actively pursued. In particular, there is an urgent need for the development of sportswear textile materials that combine functionality, such as light weight and breathability, and can be used for a wide range of activities, from light trekking to active sports.

[0004] Therefore, Korean Patent Publication No. 10-1808459, "Polyester Modified Cross-Section Yarn with Excellent Sweat Absorption, Quick-Drying Properties, and Abrasion Resistance, and Manufacturing Method Thereof," and Korean Patent Publication No. 10-2011-0076122, "Polybutylene Terephthalate Modified Cross-Section Fiber with Excellent Sweat Absorption, Quick-Drying Properties, and Stretch Properties," have been disclosed. These modified cross-section fibers (yarns) are made by modifying the cross-sections of the filaments that make up the original yarn, forming voids within the original yarn, which is made up of a bundle of filaments. The microvoids formed between the filaments allow moisture to be absorbed and released through capillary action (which speeds up absorption through the microvoids and increases the surface area for water diffusion). In other words, the capillary action within the original yarn allows for faster sweat absorption and evaporation, thereby imparting moisture absorption and quick-drying properties.

[0005] However, conventional modified cross-section yarns have a disadvantage in that they have a lower moisture absorption rate than cotton yarns and are unable to adequately absorb sweat or breath exhaled by a user wearing a product (fabric) made from the modified cross-section yarns. In addition, because the product made from the conventional modified cross-section yarns has a low moisture absorption rate, only a small amount of moisture is released to the outside, which results in a problem that the wearer does not actually feel comfortable.

[0006] In addition, products made from conventional modified cross-section yarns can generate heat from the skin due to moisture that cannot be expelled to the outside, increasing the coefficient of friction between the fabric and the skin during physical activity. Furthermore, most conventional modified cross-section yarns are polyester yarns, which, as mentioned above, do not provide a cooling sensation compared to existing polyethylene fibers. Therefore, the wearer may feel even more hot and sweat more, which can cause discomfort.

[0007] For this reason, there is a current need to further develop new fiber materials that can rapidly absorb and release large amounts of moisture and have a cooling sensation. Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a modified cross-section polyethylene raw yarn that can be used to produce fabrics having a cooling sensation and sweat-absorbing and quick-drying properties, and a functional fabric containing the same. [Means for solving the problem]

[0009] The polyethylene yarn according to the present invention comprises a filament including a central body and two or more projections protruding from the central body, based on a cross section perpendicular to the longitudinal direction, and has a crystallinity of 56 to 85%.

[0010] In a polyethylene yarn according to an embodiment of the present invention, a first radius (R1) of an inscribed circle formed by the central body and a second radius (R2) of a circumscribed circle formed by the central body and protrusions may satisfy the following formula, based on a cross section perpendicular to the longitudinal direction of the filament.

[0011] [formula] 1.2≦R2 / R1≦5.0

[0012] In the polyethylene yarn according to an embodiment of the present invention, the yarn may have a melt index (MI) at 190°C of 1 to 25g / 10min, measured at 190°C and 2.16kg according to ASTM D1238.

[0013] In the polyethylene yarn according to one embodiment of the present invention, the yarn may have a polydispersity index (PDI) of 5-30.

[0014] In the polyethylene yarn according to one embodiment of the present invention, the yarn may have a tenacity of 5 to 10 g / d as measured by ASTM D2256.

[0015] The functional fabric according to the present invention comprises the polyethylene yarn described above.

[0016] In one embodiment of the functional fabric of the present invention, the fabric has a cooling sensation (Q-max) of 0.1 to 0.5 W / cm, measured by contacting a 30±2°C hot plate (T-box) with the fabric at 20±2°C at 20±2°C and 65±2% RH. 2 may be.

[0017] In the functional fabric according to one embodiment of the present invention, the fabric has a heat flux of 95 to 150 W / m when measured at 20±2°C and 65±2% RH. 2 may be.

[0018] In the functional fabric according to one embodiment of the present invention, the fabric may have a moisture absorption rate of 80 to 160 mm / 10 min according to the Byreck method B of KS K0642 8.26.

[0019] In the functional fabric according to one embodiment of the present invention, the fabric has a moisture drying speed of 20 to 50 mm according to the A method of KS K0642 8.25. / It may be min.

[0020] The sweat-absorbing and quick-drying product according to the present invention is manufactured from the functional fabric described above. [Effects of the Invention]

[0021] The modified cross-section polyethylene yarn according to the present invention can rapidly move and discharge moisture and has excellent thermal conductivity, making it possible to produce fabrics that are sweat-absorbent, quick-drying, and cool to the touch.

[0022] In addition, the functional fabric according to the present invention contains polyethylene yarn with excellent thermal conductivity and sweat-absorbing and quick-drying properties, and therefore has a cooling sensation and sweat-absorbing and quick-drying properties, and can quickly discharge moisture generated by sweat, humidity, and exhalation, and release heat to the outside, reducing dampness and heat, thereby providing a comfortable feeling to the user. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a cross-sectional view of a filament of a modified cross-section polyethylene yarn according to a first embodiment of the present invention. [Figure 2] FIG. 3 is a cross-sectional view of a filament of a modified cross-section polyethylene yarn according to a second embodiment of the present invention. [Figure 3] FIG. 1 is a schematic diagram showing an apparatus for measuring the cool touch feeling of fabric. [Figure 4] Photographs showing a thermal mannequin experiment measuring heat flux through fabrics. [Figure 5]2 is an optical microscope photograph showing an enlarged cross section of a filament of the modified cross-section polyethylene yarn shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0024] Unless otherwise defined, the technical and scientific terms used in this specification have the meanings that are commonly understood by a person of ordinary skill in the art to which this invention belongs, and in the following description and accompanying drawings, descriptions of known functions and configurations that may obscure the gist of the present invention will be omitted.

[0025] Also, as used herein, the singular forms "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0026] Furthermore, units used in this specification without any special mention are based on weight, and as an example, the unit of % or ratio means % by weight or weight ratio, and % by weight means the weight % of any one component in the total composition, unless otherwise defined.

[0027] Furthermore, the numerical ranges used herein include lower and upper limits and all values ​​within the range, increments logically derived from the form and width of the defined range, all doubly limited values, and all possible combinations of upper and lower limits of numerical ranges limited in different forms. Unless otherwise specified in the specification of the present invention, values ​​outside the numerical range that may occur due to experimental error or rounding of values ​​are also included in the defined numerical range.

[0028] As used herein, the term "comprising" is an open-ended statement having a meaning equivalent to expressions such as "comprising," "containing," "having," or "characterized by," and does not exclude additional, unrecited elements, materials, or steps.

[0029] Sweat-wicking and quick-drying means that moisture such as sweat, humidity, and breath can be quickly absorbed and dried, and is required in a variety of fields to provide comfort to the human body, such as sportswear, workwear, and masks.

[0030] Conventionally, the cross-section of the filaments forming the yarn was modified to form voids within the yarn, which consisted of a bundle of filaments, and the microvoids formed between the filaments led to capillary action, giving the yarn sweat-absorbing and quick-drying properties. However, conventional modified cross-section yarns have a lower moisture absorption rate than cotton yarns, and products (fabrics) made from the modified cross-section yarns have the disadvantage of not being able to adequately absorb sweat or breath excreted by a user wearing them. Furthermore, products made from conventional modified cross-section yarns have a low moisture absorption rate, which results in little moisture being excreted to the outside, resulting in a problem of the wearer feeling substantially uncomfortable.

[0031] In addition, products made from conventional modified cross-section yarns may generate heat from the skin due to moisture that cannot be expelled to the outside, increasing the coefficient of friction between the fabric and the skin during human activity. Furthermore, most conventional modified cross-section yarns are polyester yarns, which, as mentioned above, do not have the cooling sensation of conventional polyethylene fibers. Therefore, when wearing products made from conventional modified cross-section yarns, users may feel even more hot and excrete more sweat, which can cause discomfort.

[0032] Therefore, the applicant conducted extensive research over a long period of time to develop a high-value-added yarn that can simultaneously have excellent sweat absorption, quick-drying properties, and a cooling sensation. As a result, the applicant discovered that a modified cross-section polyethylene yarn having a specific shape has excellent sweat absorption, quick-drying properties, and provides the cooling sensation unique to polyethylene, making it possible to manufacture products that provide excellent comfort when worn by the user. As a result of further research on this, the applicant has completed the present invention.

[0033] The polyethylene raw yarn of the present invention comprises filaments that include a central body and two or more projections protruding from the central body, based on a cross section perpendicular to the longitudinal direction, and may have a crystallinity of 56 to 85%, specifically 60 to 85%, and more specifically 65 to 75%.

[0034] This polyethylene yarn is made up of a bundle of filaments with a specific cross-section, and the cross-sectional structure of the filaments creates microvoids between the filaments in the yarn, which allows for smooth absorption and discharge of moisture through capillary action.In addition, polyethylene has excellent thermal conductivity, making it possible to manufacture fabrics that are sweat-wicking, quick-drying, and cool to the touch.

[0035] FIG. 1 shows a polyethylene yarn filament according to one embodiment of the present invention.

[0036] Referring to FIG. 1, the polyethylene yarn includes filaments having a central body and two or more protrusions protruding from the central body in a cross section perpendicular to the longitudinal direction. As described above, the cross section of the filaments is deformed, which results in the formation of microvoids between the filaments in the yarn.

[0037] In one embodiment of the present invention, the filaments constituting the polyethylene yarn are non-porous, and voids are formed in the polyethylene yarn only through the spaces between the filaments. That is, the void ratio of the polyethylene yarn is formed by microvoids between the filaments. Specifically, the area occupied by the filaments may be 50 to 99%, specifically 60 to 90%, of the cross-section of the yarn measured along the outer shape of the yarn in a direction perpendicular to the longitudinal direction of the polyethylene yarn. The area excluding this may be the area in which voids are formed in the yarn, and may be the cross-sectional void ratio of the yarn. Thus, polyethylene yarn with a high void ratio formed by the microvoids formed between the filaments maintains the cooling sensation characteristic of polyethylene while enabling rapid absorption and drying of moisture.

[0038] Specifically, the central body may have various cross-sectional shapes, such as polygonal shapes (e.g., triangular, rectangular, pentagonal), elliptical, or circular shapes, based on a cross section perpendicular to the longitudinal direction of the filament, but preferably has a circular or nearly circular cross-sectional shape and forms an average radius, as shown in Figure 1. In this case, the radius of the central body in a cross section perpendicular to the longitudinal direction of the filament refers to the inscribed circle of the filament.

[0039] Alternatively, as shown in Figure 2, the central body may be elliptical based on a cross section perpendicular to the longitudinal direction of the filament. In this case, the radius of the central body in the cross section perpendicular to the longitudinal direction of the filament refers to the inscribed circle of the filament. Since the inscribed circle is elliptical, the radius may be any one selected from the minor axis and major axis of the ellipse. Preferably, it refers to the major axis.

[0040] The protrusions are formed by protruding from the core based on a cross section perpendicular to the longitudinal direction of the filament, and the filament including the protrusions has a deformed cross section perpendicular to the longitudinal direction. In the raw yarn including such filaments, microvoids are formed between the filaments, forming flow paths that can absorb moisture by capillary action, i.e., microchannels (microvoids). Therefore, the raw yarn can absorb and discharge moisture through the microchannels, and has excellent sweat absorption and quick-drying properties.

[0041] The protrusions may have any shape as long as they protrude from the central body, but may have gently rounded ends. The size of the protrusions is not limited as long as they can separate the filaments in the yarn to an extent that they can absorb water by capillary action, i.e., the length of the protrusions protruding from the central body.

[0042] However, it is advantageous in terms of water absorption capacity by capillary action if, based on a cross section perpendicular to the longitudinal direction of the yarn or filament, the first radius (R1) of the inscribed circle formed by the central body and the second radius (R2) of the circumscribed circle formed by the central body and the protrusions satisfy the following formula:

[0043] [formula] 1.2≦R2 / R1≦5.0

[0044] More specifically, in the above formula, 1.2≦R2 / R1≦3.5 or 1.3≦R2 / R1≦3 may be satisfied. Within this range, despite the hydrophobicity of polyethylene, the strong capillary force allows smooth water absorption into the yarn.

[0045] In addition, in a cross section perpendicular to the longitudinal direction of the filament, the ratio of the length of one protrusion to the circumference of the inscribed circle of the filament formed by the central body may be 10% or more, specifically 20 to 50%. Here, the length of a protrusion means the length of an arc connecting the points of contact between both ends of the protrusion and the inscribed circle on the circumference of the inscribed circle. Specifically, in FIG. It could mean JPEG0007738194000001.jpg1544.

[0046] The number of protrusions is two or more, specifically two to five. Preferably, when the central body is circular, three protrusions are provided so that the cross section of the filament perpendicular to the longitudinal direction is trilobal, which makes it easy to adjust the size of the microchannel by adjusting the lengths of the inscribed and circumscribed circles.

[0047] Alternatively, when the central body is elliptical, providing four of them so that the cross section of the filament perpendicular to the longitudinal direction is formed into a four-lobe shape is advantageous in adjusting the size of the microchannel.

[0048] The protrusions may be arranged at regular intervals along the circumferential direction of the central body, but are not limited to this. For example, as shown in FIG. 1, when three protrusions are provided, they may be arranged at regular intervals along the circumferential direction of the central body. Alternatively, when two protrusions are provided, the protrusions may be positioned offset to either side of the central body.

[0049] Alternatively, as shown in FIG. 2, when four protrusions are provided, pairs of protrusions are arranged symmetrically with respect to each other with respect to the elliptical center body.

[0050] As described above, the multiple protrusions formed on the central body preferably occupy 60% or more, specifically 80 to 100%, of the total area of ​​the surface of the central body on which the protrusions are formed. Here, 100% means that the protrusions are continuously formed with respect to the total area of ​​the surface of the central body. Specifically, as shown in FIG. 1, the ends of adjacent protrusions may be positioned so as to contact each other, and the cross-sectional shape of the filament may be wavy along the circumferential direction of the filament, based on a cross section perpendicular to the longitudinal direction of the filament.

[0051] As described above, such polyethylene yarn is a bundle of multiple filaments having a modified cross section, and the area occupied by the filaments may be 70 to 99%, more specifically 80 to 95%, of the cross section perpendicular to the longitudinal direction. The area other than the area occupied by the filaments may refer to the area occupied by the microvoids or the area formed by the microchannels. Within this range, sufficient moisture absorption and discharge capabilities by the microchannels can be obtained.

[0052] The polyethylene yarn may contain multiple filaments. The yarn is not limited to any particular number of filaments, as long as the number of filaments is sufficient to form microvoids. For example, the polyethylene yarn may contain 40 to 500 filaments, each having a fineness of 1 to 3 denier, and may have a total fineness of 100 to 1,000 denier.

[0053] In addition, polyethylene yarn has a density of 0.90 to 0.99 g / cm 3 , or 0.93 to 0.97 g / cm 3 Furthermore, the polyethylene yarn may have a crystallinity of 56 to 85%, specifically 60 to 85%, and more specifically 65 to 75%, after spinning, and may exhibit uniform crystallinity from the center to the outer corners of the polyethylene yarn. The crystallinity of the polyethylene yarn is determined along with the size of uncrystallized particles during crystallinity analysis using an X-ray diffraction analyzer. When the crystallinity satisfies the above range, lattice vibrations called "phonons" occur in the direction of the covalently linked molecular chains of high-density polyethylene (HDPE), allowing heat to diffuse and dissipate quickly, improving the ability to expel moisture such as sweat and exhaled air, thereby providing a fabric with an excellent cooling sensation. In particular, the polyethylene yarn according to one embodiment has a higher crystallinity per unit volume than a hollow, filled yarn, and can contain more crystalline portions when compared to a yarn of substantially the same diameter, allowing for the production of a fabric with the excellent cooling sensation desired in the present invention.

[0054] Additionally, the polyethylene yarn may have a melt index (MI, @190°C) measured at 190°C and 2.16 kg according to ASTM D1238 of 1 to 25 g / 10 min, specifically 3 to 15 g / 10 min, and more specifically 5 to 10 g / 10 min, but is not limited thereto, although relatively good strength can be obtained within this range.

[0055] The polyethylene raw yarn may have a polydispersity index of 5 to 30, specifically 10 to 20. The tenacity measured according to ASTM D2256 may be 5 to 10 g / d, specifically 6 to 9 g / d, and more specifically 7 to 8 g / d. Within this range, the polyethylene raw yarn can have high thermal conductivity and at the same time, an appropriate bending resistance that is advantageous for weaving.

[0056] A method for producing a polyethylene yarn according to one embodiment of the present invention will be described in detail below with reference to Fig. 1. The polyethylene yarn of the present invention is not limited to any particular production method as long as it satisfies the above-mentioned ranges of physical properties such as PDI, strength, and elongation, and only one embodiment will be described below.

[0057] First, polyethylene chips are introduced into an extruder 100 and melted to obtain a polyethylene melt.

[0058] Molten polyethylene is transported to a die 200 by a screw (not shown) in the extruder 100 and extruded through a plurality of holes formed in the die 200. The number of holes in the die 200 can be determined depending on the DPF (Denier Per Filament) and fineness of the yarn to be produced. For example, when producing a yarn having a total fineness of 75 denier, the die 200 may have 20 to 75 holes, and when producing a yarn having a total fineness of 450 denier, the die 200 may have 90 to 450 holes, preferably 100 to 400 holes.

[0059] The melting process in the extruder 100 and the extrusion process through the die 200 can be changed and applied depending on the melt index of the polyethylene chips, but specifically, for example, they are preferably performed at 150 to 315°C, preferably 250 to 315°C, and more preferably 265 to 310°C. In other words, it is preferable that the extruder 100 and the die 200 are maintained at a temperature of 150 to 315°C, preferably 250 to 315°C, and more preferably 265 to 310°C.

[0060] If the spinning temperature is less than 150°C, the polyethylene does not melt uniformly due to the low spinning temperature, making spinning difficult. On the other hand, if the spinning temperature is more than 315°C, the polyethylene may be thermally decomposed, making it difficult to achieve the desired strength.

[0061] As the molten polyethylene is extruded from the holes of the modified cross-section die 200, the difference between the spinning temperature and room temperature causes the polyethylene to begin to solidify, forming semi-solidified filaments 11. In this specification, the term "filament" refers collectively to not only semi-solidified filaments but also completely solidified filaments.

[0062] The plurality of filaments 11 are completely solidified by being cooled in a cooling section (or "quenching zone") 300. The filaments 11 are cooled by air cooling.

[0063] The cooling of the filaments 11 in the cooling unit 300 is preferably performed using cooling air at a speed of 0.2 to 1 m / sec to cool the filaments 11 to 15 to 40° C. If the cooling temperature is less than 15° C., the filaments 11 may be overcooled, resulting in insufficient elongation and possibly causing breakage during drawing. If the cooling temperature is more than 40° C., the filaments 11 may be solidified non-uniformly, resulting in large deviations in stiffness, resulting in breakage during drawing.

[0064] Furthermore, multi-stage cooling in the cooling section allows for more uniform crystallization, which allows for smoother discharge of moisture and sweat, resulting in the production of yarn with an excellent cooling sensation. More specifically, the cooling section is divided into two or more sections. For example, when the cooling section has three cooling sections, it is preferable that the temperatures are designed to gradually decrease from the first cooling section to the third cooling section. Specifically, for example, the first cooling section may be set to 40 to 80°C, the second cooling section to 30 to 50°C, and the third cooling section to 15 to 30°C.

[0065] Furthermore, by setting the air velocity in the first cooling section to the highest, it is possible to produce fibers with a smoother surface. Specifically, the first cooling section may use cooling air with a velocity of 0.8 to 1 m / sec, the second cooling section may use cooling air with a velocity of 0.4 to 0.6 m / sec, and the third cooling section may use cooling air with a velocity of 0.2 to 0.5 m / sec. By adjusting the conditions in this way, it is possible to produce raw yarn with a higher crystallinity and a smoother surface.

[0066] Next, the cooled and completely solidified filaments 11 are converged in a concentrator 400 to form a multifilament 10.

[0067] As shown in Fig. 1, the polyethylene raw yarn of the present invention can be produced by a direct spin-draw (DSD) process. That is, the multifilament 10 is directly transferred to a multi-stage drawing section 500 including a plurality of godet roller sections GR1...GRn, where it is multi-stage drawn to a bending resistance of 2 to 20, preferably at a total draw ratio of 3 to 15, and then wound on a winder 600. In addition, by imparting a shrinkage draw (relaxation) of 1 to 5% in the final drawing section of the multi-stage drawing, a raw yarn with better durability can be provided.

[0068] Alternatively, the polyethylene raw yarn of the present invention may be produced by first winding the multifilament 10 as an undrawn yarn and then drawing the undrawn yarn. That is, the polyethylene raw yarn of the present invention may be produced through a two-step process in which polyethylene is melt-spun to first produce an undrawn yarn, and then the undrawn yarn is drawn.

[0069] If the total draw ratio applied in the drawing process is less than 2, the final polyethylene yarn cannot have a crystallinity of 56% or more, or 60% or more, and there is a risk of pilling being induced on fabrics made from the yarn.

[0070] On the other hand, if the total draw ratio exceeds 15 times, yarn breakage may occur, the strength of the finally obtained polyethylene yarn may be inadequate, and the weavability of the polyethylene yarn may be poor. Furthermore, fabrics manufactured using the polyethylene yarn may be excessively stiff, causing inconvenience to users.

[0071] Once the linear speed of the first godet roller section GR1, which determines the spinning speed of the melt spinning of the present invention, is determined, the linear speeds of the remaining godet roller sections are appropriately determined so that a total draw ratio of 2 to 20, preferably 3 to 15, can be applied to the multifilament 10 in the multi-stage drawing section 500.

[0072] According to one embodiment of the present invention, the temperatures of the godet roller units GR1...GRn of the multistage drawing unit 500 are appropriately set in the range of 40 to 140°C, thereby heat-setting the polyethylene yarn in the multistage drawing unit 500. Specifically, for example, the multistage drawing unit may be composed of three or more drawing sections, specifically, three to five drawing sections. Furthermore, each drawing section may be composed of several godet roller units.

[0073] Specifically, for example, the multistage drawing section may comprise four drawing sections, and may perform drawing to a total draw ratio of 7 to 15 times in the first to third drawing sections, followed by shrinkage drawing (relaxation) of 1 to 3% in the fourth drawing section. The total draw ratio refers to the final draw ratio of the fiber after passing through the first to third drawing sections, compared to the fiber before drawing.

[0074] More specifically, the first stretching section may be performed at 40 to 130°C, with a total stretch ratio of 2 to 5. The second stretching section may be performed at a higher temperature than the first stretching section, specifically at 100 to 150°C, with stretching to a total stretch ratio of 5 to 8. The third stretching section may be performed at 100 to 150°C, with stretching to a total stretch ratio of 7 to 15. The fourth stretching section may be performed at the same or lower temperature as the second stretching section, specifically at 80 to 140°C, with 1 to 3% shrinkage stretching (relaxation).

[0075] The multistage drawing section 500 simultaneously performs multistage drawing and heat setting of the multifilament 10, and the multistage drawn multifilament 10 is wound on a winder 600 to complete the polyethylene yarn of the present invention.

[0076] The functional fabric according to the present invention includes the polyethylene yarn described above, which has excellent thermal conductivity and sweat-absorbing and quick-drying properties, and thus has a cooling sensation and sweat-absorbing and quick-drying properties, and can quickly release moisture generated by sweat, humidity, exhalation, etc. When a user wears a product made from such a fabric, it can quickly release moisture and heat to the outside, reducing dampness and heat, thereby providing a comfortable feeling to the user.

[0077] The functional fabric according to the present invention may use the polyethylene yarn described above alone, or may further contain a different type of yarn to impart other functionality. However, from the viewpoint of simultaneously having better cooling sensation and sweat-absorbing and quick-drying properties, it is preferable to use the polyethylene yarn alone.

[0078] Specifically, functional fabrics have a cooling sensation of 0.1 to 0.5 W / cm2 measured at 20±2°C and 65±2% RH. 2 , more specifically 0.15 to 0.3 W / cm 2 The functional fabric may have a heat flux measured at 20±2°C and 65±2% RH of 95 to 150 W / m 2 , specifically 100-120W / m 2 Such a functional fabric having a cooling sensation may provide an excellent cooling sensation that makes the user feel comfortable in a high temperature environment when it is later manufactured or processed into a product and worn by the user.

[0079] The functional fabric may also have a moisture absorption rate of 80 to 160 mm / 10 min, specifically 100 to 130 mm / 10 min, according to the Byreck method B of KS K0642 8.26. Under the same conditions, such a functional fabric has a moisture absorption rate higher than that of cotton yarn, which has a moisture absorption rate of around 50 mm / 10 min, and has excellent moisture absorption capacity.

[0080] Furthermore, the functional fabric has a moisture drying speed of 20 to 50 mm according to the A method of KS K0642 8.25. / min, specifically 30-40mm / min, which is a relatively fast moisture-wicking rate, and moisture can be easily removed. Functional fabrics that exhibit fast moisture absorption and moisture-drying rates have excellent sweat-wicking and quick-drying capabilities, allowing them to quickly absorb and release moisture such as sweat, humidity, and breath.

[0081] Functional fabrics are 150-800g / m 2 The fabric may be a woven or knitted fabric having a weight per unit area (i.e., areal density) of 150 g / m. 2 If the surface density of the fabric is less than 800 g / m, the fabric will not be dense enough and many voids will exist within the fabric, which will reduce the cooling sensation of the fabric. 2 If it is too much, the fabric will be too dense and stiff, causing problems with the feel felt by the user, and the high weight will cause problems in use.

[0082] Such fabrics are processed into sweat-absorbing, quick-drying products that simultaneously require sweat-absorbing, quick-drying properties and a cool sensation. The products can be any conventional textile products, but preferably may be summer clothes, sportswear, masks, and work clothes that provide a cool sensation and sweat-absorbing, quick-drying properties to the human body.

[0083] The present invention has been described above using specific and limited examples and drawings, but these are merely provided for a more general understanding of the present invention, and the present invention is not limited to the above examples. Those skilled in the art will appreciate that various modifications and variations can be made from such descriptions.

[0084] Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the scope of the claims below, but also all things that are equivalent or equivalent modifications to the scope of these claims belong to the scope of the spirit of the present invention.

[0085] [Measurement of physical properties of raw yarn] 1. Weight-average molecular weight (Mw) (g / mol) and polydispersity index (PDI) After the polyethylene yarn was completely dissolved in the following solvent, the weight average molecular weight (Mw) and polydispersity index (Mw / Mn: PDI) of the polyethylene yarn were determined using the following gel permeation chromatography (GPC).

[0086] -Analytical equipment: Tosoh HLC-8321 GPC / HT -Column: PLgel guard (7.5 x 50 mm) + 2 x PLgel mixed-B (7.5 x 300 mm) -Column temperature: 160℃ Solvent: Trichlorobenzene (TCB) + 0.04 wt.% dibutylhydroxytoluene (BHT) (after drying with 0.1% CaCl2) -Injector and detector temperature: 160℃ -Detector: RI Detector -Flow rate: 1.0ml / min -Injection volume: 300μl -Sample concentration: 1.5mg / mL -Standard sample: polystyrene

[0087] <2.Strength (g / d)> Deformation-stress curves of polyethylene yarns were obtained using a universal tensile tester manufactured by Instron Engineering Corp. (Canton, Mass.) according to ASTM D2256. The sample length was 250 mm, the tensile speed was 300 mm / min, and the initial load was set to 0.05 g / d. The strength (g / d) was calculated from the stress and elongation at the break point. Five measurements were taken for each yarn, and the average value was calculated.

[0088] <3. Crystallinity> The crystallinity of the polyethylene yarn was measured using an XRD (X-ray Diffractometer) [manufacturer: PANalytical, model name: EMPYREAN]. Specifically, the polyethylene yarn was cut to prepare a sample having a length of 2.5 cm, and the sample was fixed to a sample holder, and then measurement was performed under the following conditions.

[0089] -Light source (X-ray Source):Cu-Kα radiation -Power: 45KV x 25mA - Mode: Continuous scan mode -Scan angle range: 10~40° -Scanning speed: 0.1° / sec

[0090] <4. Melting index> Measured at 190°C and 2.16 kg according to ASTM D1238.

[0091] [Measurement of fabric properties] <1. Cool sensation to the touch> The measurements were conducted at the request of the Korea Clothing Testing and Research Institute using a KES-F7 (Thermo Labo II) device in a test environment of 20±2°C and 65±2% RH.

[0092] Specifically, a 20cm x 20cm fabric sample was prepared and left for 24 hours under conditions of 20±2°C temperature and 65±2% RH. Next, the fabric's coolness to the touch (Qmax) was measured using a KES-F7 THERMO LABO II (Kato Tech Co., Ltd.) device in a test environment of 20±2°C temperature and 65±2% RH. Specifically, as shown in Figure 3, the fabric sample 23 was placed on a base plate (also called a "Water-Box") 21 maintained at 20°C, and a T-Box 22a (contact area: 3cm x 3cm) heated to 30°C was placed on the fabric sample 23 for one second. In other words, the other side of the fabric sample 23, which was in contact with the base plate 21, was momentarily brought into contact with the T-Box 22a. The contact pressure applied to the fabric sample 23 by the T-Box 22a was 6gf / cm. 2 The Qmax value displayed on a monitor (not shown) connected to the device was then recorded. This test was repeated 10 times, and the arithmetic mean of the Qmax values ​​was calculated.

[0093] <2.Heat flux> After placing the thermal manikin in an artificial climate chamber, measurements were taken in a test environment of 20±2°C and 65±2% RH.

[0094] Specifically, a male thermal manikin was placed in the center of a climate chamber at 20±2°C and 65±2% RH, as shown in Figure 4. Next, the temperature of the thermal manikin was set to 33.7°C, and then the power was supplied to heat the thermal manikin.

[0095] After that, a sample of a men's size 95 jacket was prepared and placed on a heated thermal mannequin. The surface temperature of the thermal mannequin and the power value for maintaining the temperature of the thermal mannequin were measured at 1-minute intervals for 30 minutes, and the unit area of ​​1 m per unit time (1 min) was calculated. 2 The heat flux (W / m) is the amount of heat energy consumed per unit 2 ) was measured.

[0096] <3. Moisture absorption rate> The moisture absorption rate of the fabric was measured using Method B (Byreck method) of KS K0642 8.26.

[0097] Specifically, five identical fabric samples measuring 20 cm x 2.5 cm were prepared and fixed at a certain height with a horizontal rod so that one end of the sample touched the water surface of a container containing distilled water at 20 ± 2°C. After 10 minutes, the height to which the water rose due to capillary action was measured and expressed as an average value.

[0098] <4. Moisture drying speed> The moisture drying rate of the fabric was measured using Method A of KS K0642 8.25.

[0099] Specifically, three test pieces measuring 4 cm x 4 cm were prepared and then immersed in distilled water at 20 ± 2°C in a spread state until the test pieces absorbed sufficient water. After this, when the test pieces were removed from the distilled water and no more water droplets fell, they were attached to a drying time measuring device and left in a test room at 20 ± 2°C and 65 ± 2% RH. The time until they dried naturally and reached a constant weight was measured.

[0100] [Example 1] <Production of polyethylene yarn> A polyethylene yarn containing 200 filaments and having a total fineness of 150 denier was produced.

[0101] First, polyethylene chips were placed in an extruder 100 and melted. The molten polyethylene was extruded through a die 200 with 200 holes. The die temperature was 270°C. The die nozzle was "Y" shaped.

[0102] The filaments 11 formed while being extruded from the nozzle holes of the spinneret 200 were cooled to 50°C in the first cooling section by cooling air at a speed of 0.9 m / sec, cooled to 35°C in the second cooling section by cooling air at a speed of 0.5 m / sec, and finally cooled to 25°C in the third cooling section by cooling air at a speed of 0.4 m / sec. After being cooled, the filaments were bundled into a multifilament yarn by a bundler.

[0103] Next, the multifilament yarn was transferred to the drawing unit 500. The drawing unit was a multi-stage drawing unit consisting of four zones, specifically, in the first drawing zone, drawing was performed at a total draw ratio of 3 times at a maximum drawing temperature of 80°C, in the second drawing zone, drawing was performed at a total draw ratio of 7 times at a maximum drawing temperature of 120°C, in the third drawing zone, drawing was performed at a total draw ratio of 10 times at a maximum drawing temperature of 130°C, and in the fourth drawing zone, drawing was performed at a maximum drawing temperature of 120°C, with a 2% shrinkage (relaxation) compared to the third drawing zone, and heat setting was performed.

[0104] Next, the drawn multifilament yarn was wound on a winder 600. The winding tension was 0.8 g / d.

[0105] An optical microscope photograph of the cross section of the produced yarn is shown in FIG. 5, and the physical properties of the produced yarn were measured and are shown in Table 1 below.

[0106] <Manufacturing of functional fabrics> The polyethylene yarn thus produced was woven to a surface density of 500 g / m 2 The physical properties of the functional fabric were measured and are shown in Table 3 below.

[0107] [Examples 2 to 5] Fabrics were produced in the same manner as in Example 1, except that the raw yarn conditions were changed as shown in Table 1 below. In addition, the physical properties of the fabrics produced in the same manner as in Example 1 were measured and are shown in Table 3 below.

[0108] [Example 6] The yarn and fabric were produced in the same manner as in Example 1, except that a ">-<" type nozzle was used as the spinneret nozzle. The physical properties of the produced yarn and fabric were measured and are shown in Tables 1 and 3 below.

[0109] [Comparative Example 1] A yarn and fabric were produced in the same manner as in Example 1, except that a circular nozzle was used instead of the die nozzle. The physical properties of the yarn are shown in Table 2 below, and the physical properties of the fabric produced in the same manner as in Example 1 were measured and are shown in Table 4 below.

[0110] Comparative Example 2 Polyethylene terephthalate (PET) fibers having the same cross-sectional shape and size as those in Example 1 were prepared, and then fabric was manufactured in the same manner as in Example 1. The physical properties of the raw yarn are shown in Table 2 below, and the physical properties of the fabric manufactured in the same manner as in Example 1 were measured and are shown in Table 4 below.

[0111] Comparative Example 3 Polyethylene terephthalate (PET) fibers having the same cross-sectional shape and size as those in Example 1 and containing titanium dioxide (TiO2) as an absorbent additive were prepared, and then fabric was manufactured in the same manner as in Example 1. The physical properties of the raw yarn are shown in Table 2 below, and the physical properties of the fabric manufactured in the same manner as in Example 1 were measured and are shown in Table 4 below.

[0112] Comparative Example 4 A yarn was produced in the same manner as in Example 1, except that the drawing process of the polyethylene yarn was changed from multi-stage drawing to single drawing so that the crystallinity would satisfy the criteria in Table 2 below. The physical properties of the fabric produced were measured and are shown in Table 4 below.

[0113] Comparative Example 5 A polyethylene yarn was produced in the same manner as in Example 1, except that the cooling process of the polyethylene yarn was changed from multi-stage cooling to single cooling (cooling to 25°C with cooling air at a wind speed of 0.5 m / sec) so that the crystallinity would satisfy the criteria in Table 2 below. The physical properties of the fabric produced were measured and are shown in Table 4 below.

[0114] [Table 1]

[0115] [Table 2]

[0116] [Table 3]

[0117] [Table 4]

[0118] Referring to Tables 1 to 4, it can be seen that the fabrics made from the yarns according to the examples of the present invention have a high cool feeling to the touch and also have excellent sweat absorption and quick drying capabilities. Therefore, the fabrics made from the yarns according to the examples can provide the user with a significantly excellent cool feeling.

[0119] In contrast, in the case of the fabric of Comparative Example 1, the cool touch sensation showed similar values ​​to those of the Examples, but the moisture absorption rate and moisture drying rate were low, so moisture could not be removed quickly, and it was revealed that the cool touch sensation felt by the user was reduced.

[0120] In the case of Comparative Examples 2 and 3, the cool touch feeling, heat flux, moisture absorption and drying speed were all low, and it was confirmed that the possibility of using them as products with cool touch feeling and sweat absorption and quick drying properties was very low.

[0121] The present invention has been described above using specific details and limited examples and drawings, but these are merely provided for a more general understanding of the present invention, and the present invention is not limited to the above examples. Those skilled in the art will be able to make various modifications and variations from such descriptions.

[0122] Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the scope of the claims below, but also all equivalent or similar modifications to the scope of these claims fall within the scope of the spirit of the present invention. [Explanation of symbols]

[0123] 1: filament, 10: centrosome 10a: inscribed circle, 30: protrusion 30a: Circumcircle

Claims

1. Based on a cross section perpendicular to the longitudinal direction, A filament comprising a central body and two or more projections protruding from the central body, Polyethylene yarn with a crystallinity of 56 to 85%.

2. 2. The polyethylene fiber according to claim 1, wherein, with respect to a cross section perpendicular to the longitudinal direction of the filament, a first radius (R1) of an inscribed circle formed by the central body and a second radius (R2) of a circumscribed circle formed by the central body and the protrusions satisfy the following formula: [formula] 1.2≦R2 / R1≦5.0

3. The polyethylene raw yarn according to claim 1, wherein the raw yarn has a melt index (MI, @190°C) of 1 to 25 g / 10 min, measured at 190°C and 2.16 kg according to ASTM D1238.

4. The polyethylene yarn according to claim 1, wherein the yarn has a polydispersity index (PDI) of 5 to 30.

5. 2. The polyethylene yarn according to claim 1, wherein the yarn has a tenacity of 5 to 10 g / d as measured by ASTM D2256.

6. A functional fabric comprising the yarn according to any one of claims 1 to 5.

7. The fabric has a cool-to-touch feel (Q-max) of 0.1 to 0.5 W / cm2 measured at 20±2°C and 65±2% RH. ２ The functional fabric according to claim 6,

8. The fabric has a heat flux of 95 to 150 W / m2 measured at 20±2°C and 65±2% RH. ２ The functional fabric according to claim 6,

9. The functional fabric according to claim 6, wherein the fabric has a moisture absorption rate of 80 to 160 mm / 10 min according to the Byreck method of KS K0642 8.26, Method B.

10. The functional fabric according to claim 6, wherein the fabric has a moisture drying rate of 20 to 50 mm / min according to Method A of KS K0642 8.

25.

11. A sweat-absorbing and quick-drying product manufactured from the functional fabric according to claim 6.

Images