TW202325929A - Shaped cross-section polyethylene yarn, functional fabric and sweat absorption and quick drying product - Google Patents

Abstract

The present invention relates to a shaped cross-sectional polyethylene yarn, a functional fabric including the same and a sweat absorption and quick drying product, and more particularly, to a shaped cross-sectional polyethylene yarn by which a fabric having a cooling sensation and sweat absorption and quick drying properties may be manufactured, a functional fabric including the same and a sweat absorption and quick drying product. A polyethylene yarn according to the present invention includes a filament having a central body and two or more protrusions protruding from the central body based on a cross section perpendicular to a longitudinal direction, wherein a degree of crystallinity of the polyethylene yarn is 60 to 85%.

Description

Polyethylene yarn with shaped cross-section and functional fabric including it

The following disclosure is about a polyethylene yarn with a shaped cross-section and a functional fabric comprising the polyethylene yarn, and more specifically, about a fabric with cool feeling and sweat-absorbing and quick-drying properties. Polyethylene yarn with shaped section of cloth and a functional cloth containing said polyethylene yarn.

Recently, in the textile industry, research has been conducted not only on improvement of polymers forming textiles but also on differences in cross-sections of spun yarns in order to develop differentiated materials with high added value. In particular, the difference in the cross-section of the spun yarn has a greater effect in improving the physical properties of the textile than the time and cost invested. Therefore, the differences in cross-sections of spinning yarns have been intensively studied.

At the same time, recently, living standards have been continuously improved, and people of all ages participate in various sports activities for self-health management. Therefore, various sportswear products have been actively developed in accordance with the increased demand for sportswear. In particular, there is an urgent need to develop textile materials for sportswear that can have the combined functions of light weight and breathability, and thus be widely used in activities ranging from hiking to sports.

In this regard, "Shaped cross-sectional polyester yarn having excellent sweat absorption and quick drying properties and abrasion resistance and method of manufacturing" the same)" disclosed in Korean Patent Publication No. 10-1808459, and "Polybutylene terephthalate fiber with a shaped cross-section having excellent sweat-absorbing and quick-drying characteristics and extensibility characteristics (Shaped cross-sectional polybutylene terephthalate fiber having excellent sweat absorption and quick drying properties and stretch properties)” is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0076122. In this cross-section-shaped fiber (spun yarn), holes are formed in the spun yarn composed of filament bundles by setting the cross-section of the filaments, so that by capillary action through the micropores formed between the filaments (Increase the rate of absorption through micropores and expand the water diffusion surface) to absorb and expel water. That is, the capillary action in spinning is used to impart the function of quickly absorbing and discharging sweat, that is, sweat-absorbing and quick-drying properties.

However, in the case of the spun yarn with a fixed cross-section according to the prior art, the rate of moisture absorption is not as good as that of cotton yarn, and the moisture generated by sweating or breathing of a user who wears a product (cloth) manufactured using the spun yarn with a fixed cross-section not fully absorbed. In addition, products manufactured using spun yarns with a fixed cross-section according to the prior art have a lower rate of moisture absorption, and a smaller amount of moisture is released to the outside, which makes it difficult for the wearer to actually feel comfortable.

In addition, in the case of a product manufactured using spinning yarn having a shaped cross-section according to the prior art, the coefficient of friction between the cloth and the skin increases due to moisture that is not discharged to the outside during human body activity, causing heat to be generated in the skin . In addition, most of the spun yarns with cross-section according to the prior art are polyester yarns and do not have a cool feeling compared to existing polyethylene fibers as described above. As a result, the wearer feels quite warm and sweats profusely, which may cause discomfort.

Therefore, there is a further need to develop a novel textile material that quickly absorbs and discharges a large amount of water and has a cool feeling. [Prior Art Literature] [Patent Document] (Patent Document 1) Korean Patent Publication No. 10-1808459 (Patent Document 2) Korean Patent Early Publication Publication No. 10-2011-0076122

Embodiments of the present invention will provide a polyethylene yarn with a shaped cross-section that can be used to manufacture fabrics with cool feeling and sweat-absorbing and quick-drying properties, and a functional fabric comprising the polyethylene yarn.

In one general aspect, the polyethylene yarn comprises a filament having a central body and two or more protrusions protruding from the central body based on a cross-section perpendicular to the longitudinal direction, wherein the polyethylene yarn has a crystallinity of 60% to 85%.

Based on the section of the polyethylene yarn perpendicular to the longitudinal direction, 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 in the central body satisfy The following expressions: [expression] 1.2 ≤ R2/R1 ≤ 3.5.

The polyethylene yarn may have a melt index (MI, @190° C.) of 1 g/10 min to 25 g/10 min when measured according to ASTM D1238.

Polyethylene yarns may have a polydispersity index (PDI) of 5 to 30.

The polyethylene yarn may have a tenacity of 5 grams/denier to 15 grams/denier when measured according to ASTM D2256.

In another general aspect, the functional fabric comprises polyethylene yarn.

The functional fabric may have 0.1 Cooling on contact (Qmax) from watts/cm2 to 0.5 watts/cm2.

The functional fabric may have a heat flux of 95 watts/square meter to 150 watts/square meter when measured at 20±2°C and 65±2% R.H.

The functional cloth may have a moisture absorption rate of 80mm/10min to 160mm/10min when measured according to the Byreck method which is the B method of KS K 0642 8.26.

The functional fabric may have a moisture drying rate of 20 mm/10 minutes to 50 mm/10 minutes when measured according to method A of KS K 0642 8.25.

In yet another general aspect, functional fabrics are used to manufacture sweat-wicking and quick-drying products.

As explained above, the polyethylene yarn with fixed cross-section according to the present invention can move quickly and discharge moisture and has excellent thermal conductivity, so that fabrics with both sweat-absorbing and quick-drying properties and cool feeling can be manufactured.

In addition, the functional fabric according to the present invention contains polyethylene yarns with excellent thermal conductivity and sweat-absorbing and quick-drying properties, so that the functional fabric has a cool feeling and sweat-absorbing and quick-drying properties, and can quickly discharge sweat or breath. It absorbs moisture and dissipates heat to the outside, reducing the feeling of humidity. Therefore, the user can feel comfortable.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those of ordinary skill in the art to which this invention pertains. Descriptions of known functions and configurations that unnecessarily obscure the gist of the present invention will be omitted in the following description and the accompanying drawings.

Furthermore, singular forms used in this specification may be intended to include plural forms unless the context clearly dictates otherwise.

In addition, units used in this specification without particular mention are based on weight, and as an example, the unit % or ratio refers to weight % or weight ratio. Unless otherwise defined, % by weight refers to % by weight of any component in the composition relative to the total weight of the composition.

In addition, numerical ranges used in this specification include upper and lower limits and all values within such limits, increments logically derived from the form and span of the defined range, all double limit values, and all values defined differently. All possible combinations of upper and lower limits in the numerical range. Unless specifically defined otherwise in this specification, all values within a numerical range that may occur as a result of rounding-off experimental errors or values also fall within the defined numerical range.

In this specification, the expression "comprises" is intended to be an opening transitional phrase with equivalent meanings to "comprises", "comprising", "have/has" and "characterized by", and does not exclude elements, materials or steps further enumerated in.

Sweat-absorbing and quick-drying properties mean quickly absorbing and drying moisture generated by sweating or breathing, and are required in various fields such as sportswear, work clothes, and coverings to provide comfort to the human body.

In the prior art, the cross-section of the filaments constituting the spun yarn is shaped to form holes in the spun yarn composed of filament bundles, thereby imparting sweat absorption speed to the spun yarn through capillary action through micropores formed between the filaments. dry properties. However, in the case of the spun yarn with a fixed cross-section according to the prior art, the rate of moisture absorption is not as good as that of cotton yarn, and the moisture generated by sweating or breathing of a user who wears a product (cloth) manufactured using the spun yarn with a fixed cross-section not fully absorbed. In addition, products manufactured using spun yarns with a fixed cross-section according to the prior art have a lower rate of moisture absorption, and a smaller amount of moisture is released to the outside, which makes it difficult for the wearer to actually feel comfortable.

In addition, in the case of a product manufactured using spinning yarn having a shaped cross-section according to the prior art, the coefficient of friction between the cloth and the skin increases due to moisture that is not discharged to the outside during human body activity, causing heat to be generated in the skin . In addition, most of the spun yarns with cross-section according to the prior art are polyester yarns and do not have a cool feeling compared to existing polyethylene fibers as described above. Consequently, a user wearing a product made using a spun yarn with a shaped cross-section according to the prior art feels rather warm and sweats profusely, which may cause discomfort

Therefore, as a result of intensive research to develop a spinning yarn with high added value that can have remarkably excellent sweat-absorbing and quick-drying properties and a cool feeling over a long period of time, the present applicant has found that it is possible to manufacture a A product that can provide significantly excellent comfort when worn, because the product has excellent sweat-absorbing and quick-drying characteristics of polyethylene and a unique cool feeling by using polyethylene yarn with a specific shape and a fixed cross-section. This completes the invention.

The polyethylene yarn of the present invention includes a filament having a central body and two or more protrusions protruding from the central body based on a cross-section perpendicular to the longitudinal direction. The degree of crystallinity of polyethylene yarns may range from 60% to 85%, and specifically from 65% to 75%.

The polyethylene yarn has a structure of multiple filaments with a specific cross-section provided in bundles, and micropores are formed between the filaments in spinning through the cross-sectional structure of the filaments, so that moisture can pass through the micropores through the capillary function to absorb and discharge smoothly. In addition, polyethylene yarn has a unique thermal conductivity of polyethylene, making it possible to manufacture fabrics with sweat-absorbing and quick-drying properties and a cool feeling.

FIG. 1 shows filaments of polyethylene yarn according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , a polyethylene yarn includes a filament having a central body and two or more protrusions protruding from the central body based on a cross section perpendicular to a longitudinal direction. As described above, polyethylene yarns comprise filaments with a shaped cross-section such that microvoids can be formed between the filaments in the spun yarn.

In an exemplary embodiment of the present invention, the filaments constituting the polyethylene yarn are non-porous, and holes may be formed in the polyethylene yarn only by the gaps between the filaments. That is, the porosity of polyethylene yarn can be obtained by microvoids formed between filaments. In particular, based on the cross-section of the spun yarn, the area occupied by the filaments may range from 50% to 99%, and in particular from 60 to 90%, along the outside of the yarn in a direction perpendicular to the longitudinal direction of the polyethylene yarn. shape to measure the area. The regions that do not include this region are regions where pores are formed in the spun yarn, and may be the areal porosity of the spun yarn. Polyethylene yarn with high porosity due to the micropores formed between the filaments absorbs and dries moisture quickly while maintaining a high level of unique cool feeling of polyethylene.

In particular, based on the cross-section of the filaments perpendicular to the longitudinal direction, the central body can have various cross-sectional shapes, for example polygonal, such as triangular, square or pentagonal, elliptical and circular. Preferably, the central body may have a circular or substantially circular cross-sectional shape, and may have an average radial length, as shown in FIG. 1 . In this case, in a section of the filament perpendicular to the longitudinal direction, the radius formed by the central body refers to the inscribed circle of the filament.

Alternatively, as shown in Figure 2, the cross-sectional shape of the central body may be elliptical based on the cross-section of the filament perpendicular to the longitudinal direction. In this case, in a section perpendicular to the longitudinal direction of the filament, the radius formed by the central body refers to the inscribed circle of the filament, and may be one selected from the short and long radii of the elliptical shape , because the inscribed circle is an ellipse. Preferably, the radius may refer to the major radius.

The protrusion protrudes from the central body based on a cross section of the filament perpendicular to the longitudinal direction, and the filament having the protrusion has a shaped shape with a cross section perpendicular to the longitudinal direction. In spinning comprising such filaments, micropores are formed between the filaments so that flow channels, ie microchannels (micropores), are formed through which moisture can be absorbed via capillary action. Therefore, the spun yarn can absorb and discharge moisture through micro-channels, so that the spun yarn can have excellent sweat-absorbing and quick-drying characteristics.

The shape of the protrusion is not limited as long as it is a shape in which the protrusion protrudes from the central body, and the tip portion of the protrusion can protrude gently in a circular shape. The protrusions are not limited as long as they have such a size that the filaments can be spaced apart from each other during spinning to the extent that moisture can be absorbed through capillary action, that is, the length protruding from the central body.

However, based on the cross-section perpendicular to the longitudinal direction of the spun yarn, when 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 in the central body ) is favorable for the moisture uptake by capillary action when the following expression is satisfied: [expression] 1.2 ≤ R2/R1 ≤ 3.5.

More specifically, the expression may be 1.3≦R2/R1≦3. Within the above range, although polyethylene is hydrophobic, moisture absorption by spinning due to strong capillary force may be smooth.

In addition, in a section perpendicular to the longitudinal direction of the filament, the ratio of the length of one protrusion to the circumference of the inscribed circle formed by the central body of the filament may be 10% or more, and specifically, 20 % to 50%. In this case, the length of the protrusion refers to the length of an arc connecting both ends of the protrusion and the contact points on the circumference of the inscribed circle. Specifically, the length of the protrusion in Figure 1 can be referred to as .

The number of protrusions provided may be 2 or more, and in particular, 2 to 5. Preferably, in the case where the central body has a circular shape, when three or more protrusions are provided, and the cross section of the filament perpendicular to the longitudinal direction is formed in a clover shape, the size of the microchannel can be adjusted by The length of inscribed circle and circumscribed circle can be easily adjusted.

Alternatively, in the case where the central body is in the shape of an ellipse, when four or more projections are provided and the cross section of the filament perpendicular to the longitudinal direction is formed in a four-leaf clover shape, the size of the microchannel can be easily adjusted .

The protrusions may be arranged at the same distance from each other along the circumferential direction of the central body, but are not limited thereto. As an example, as shown in FIG. 1 , when three protrusions are provided, the protrusions may be arranged at the same distance from each other along the circumferential direction of the central body, and when two protrusions are provided, the protrusions may be positioned such that Offset towards either side of the center body.

Alternatively, as shown in FIG. 2 , when four protrusions are provided, a pair of protrusions may be arranged symmetrically to each other with respect to the elliptical central body.

As described above, since a plurality of protrusions are formed protruding from the central body, the ratio of the area occupied by the protrusions to the entire area of one surface of the central body on which the protrusions are formed is preferably 60% or more. , and specifically, 80% to 100%. In this case, 100% means that the protrusions are continuously formed in the entire area of one surface of the central body. Specifically, as shown in FIG. 1 , the end portions of adjacent protrusions are positioned to be in contact with each other so that the cross-sectional shape of the filament along the circumferential direction of the filament may be wavy.

The polyethylene yarn is composed of a plurality of filament bundles having a shaped cross-section as described above, and based on the cross-section perpendicular to the longitudinal direction, the area occupied by the filaments may be 70% to 99%, and more specifically, 80% % to 95%. The area other than the area occupied by the filaments may refer to the area occupied by the micropores, and may refer to the area where the microchannels are formed. Within the above range, the polyethylene yarn can have sufficient moisture absorption and release capabilities through the microchannels.

Polyethylene yarns may contain multiple filaments. Spinning is not limited as long as it has the number of filaments capable of forming microvoids. As an example, the polyethylene yarn may comprise 40 to 500 filaments each having a fineness of 1 denier to 3 denier, and may have a total fineness of 100 denier to 1,000 denier.

In addition, the density of the polyethylene yarn may be 0.93 g/cm3 to 0.97 g/cm3, and the crystallinity through spinning may be 60% to 85%, and specifically, 65% to 75%. The crystallinity of polyethylene yarns can be deduced together with the crystallite size when analyzing the crystallinity using an X-ray diffractometer. When the degree of crystallinity is within the above range, heat is rapidly diffused and dissipated in the direction of molecular chains connected by covalent bonds of high-density polyethylene (HDPE) by lattice vibrations called phonons, and The function of draining moisture from perspiration or respiration has been improved, making it possible to provide fabrics with an excellent cooling feeling.

In addition, when measured at 190°C and 2.16 kg according to ASTM D1238, the melt index (MI,@190°C) of the polyethylene yarn may be, but not limited to, 1 g/10 min to 25 g/10 min, specifically 1 gram/10 minutes to 20 grams/10 minutes, and more specifically 1 gram/10 minutes to 10 grams/10 minutes. However, within the above range, the polyethylene yarn may have relatively excellent strength.

In addition, the polydispersity index of polyethylene yarns may range from 5 to 30, and specifically from 10 to 20. In this case, the strength measured according to ASTM D2256 may be 5 grams/denier to 15 grams/denier, specifically 6 grams/denier to 13 grams/denier, and more specifically 9 grams/denier Denis to 12 g/denier. Within the above range, the polyethylene yarn may have high thermal conductivity and hardness suitable for weavability.

Hereinafter, a method of manufacturing polyethylene yarn according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1 . A method of manufacturing the polyethylene yarn of the present invention is not limited as long as physical properties such as PDI, strength, and elongation of the polyethylene yarn are within the above ranges, and exemplary embodiments will be described below.

First, a polyethylene melt is obtained by injecting polyethylene in the form of wafers into the extruder 100 and melting the polyethylene.

Molten polyethylene is transported through the die 200 by screws (not shown) in the extruder 100 , and the transported polyethylene is extruded through a plurality of holes formed in the die 200 . The number of holes in the mold 200 can be determined according to the denier per filament (DPF) and the fineness of the spun yarn to be manufactured. For example, when producing a spun yarn with a total fineness of 75 deniers, the die 200 may have 20 to 75 holes; and when producing a spun yarn with a total fineness of 450 deniers, the die 200 may have 90 Up to 450 holes and preferably 100 to 400 holes.

Depending on the melt index of the polyethylene wafer, the melting process performed in the extruder 100 and the extrusion process performed in the die 200 can be changed and applied. Specifically, for example, the melting process and the extrusion process are performed at 150°C to 315°C, preferably 250°C to 315°C, and further preferably 265°C to 310°C. That is, the extruder 100 and the die 200 are maintained at 150°C to 315°C, preferably 250°C to 315°C, and more preferably 265°C to 310°C.

When the spinning temperature is lower than 150°C, polyethylene cannot be melted uniformly due to the low spinning temperature, making spinning difficult. On the other hand, when the spinning temperature is higher than 315° C., desired strength may not be exhibited due to thermal decomposition of polyethylene.

The polyethylene is solidified by the difference between the spinning temperature and the room temperature, while the molten polyethylene is discharged through the holes of the mold 200 having a shaped cross section to form the prepreg filaments 11 . In this specification, semi-cured filaments and fully cured filaments are collectively referred to as "filaments".

The plurality of filaments 11 is cooled in a cooling zone (or quench zone) 300 to fully solidify. Cooling of the filaments 11 can be performed by air cooling.

The cooling of the filaments 11 in the cooling zone 300 is preferably performed such that the filaments 11 are cooled to 15° C. to 40° C. using cooling wind having a wind speed of 0.2 m/s to 1 m/s. When the cooling temperature is lower than 15° C., the elongation is insufficient due to overcooling, which may cause yarn breakage during the stretching process. When the cooling temperature is higher than 40° C., fineness deviation among filaments 11 increases due to non-uniformity of solidification, which may cause yarn breakage during the drawing process.

In addition, multi-stage cooling is performed while cooling in the cooling zone, so that more uniform crystallization can be obtained. Therefore, it is possible to manufacture a spun yarn with an excellent cool feeling that further smoothly discharges moisture and sweat. More specifically, the cooling zone can be divided into two or more sections. For example, when the cooling zone includes three cooling sections, it is preferable to design the cooling sections such that the temperature gradually decreases from the first cooling zone to the third cooling zone. Specifically, for example, the temperature of the first cooling zone may be set at 40°C to 80°C, the temperature of the second cooling zone may be set at 30°C to 50°C, and the temperature of the third cooling zone may be set at 15°C. °C to 30 °C.

Additionally, fibers with smoother surfaces can be produced by setting the highest wind speed in the first cooling zone. Specifically, cooling air with a wind speed of 0.8 m/s to 1 m/s can be used in the first cooling zone, and cooling air with a wind speed of 0.4 m/s to 0.6 m/s can be used in the second cooling zone. In the cooling zone, cooling air with a wind speed of 0.2 m/s to 0.5 m/s can be used in the third cooling zone. By adjusting the conditions as described above, spun yarns with higher crystallinity and smoother surfaces can be produced.

Subsequently, the cooled and fully solidified filaments 11 can be interwoven by an interlacer 400 to form multifilaments 10 .

As shown in FIG. 1 , the polyethylene yarn of the present invention can be produced by a direct spinning drawing (DSD) process. That is, the multifilament 10 can be directly sent to the multistage drawing unit 500 comprising a plurality of godet rolls GR1 to godet GRn, and the multifilament 10 sent can be drawn at a total drawing rate of 2 to 20 and preferably 3 to 15. The draw ratio is subjected to multi-stage drawing, and then, the drawn multifilament 10 may be wound around a winder 600 . In addition, 1% to 5% shrinkage stretching (relaxation) is applied in the final stretching section at the time of multi-stage stretching, so that a spun yarn with better durability can be provided.

Alternatively, the polyethylene yarn of the present invention can be produced as an undrawn spun yarn by winding the multifilament 10 and then drawing the undrawn spun yarn. That is, the polyethylene yarn of the present invention can be produced through a two-stage process of melt-spinning polyethylene to produce undrawn spun yarn, and then drawing the undrawn spun yarn.

When the total draw ratio applied in the drawing process is less than 2, the finally obtained polyethylene yarn may not have a crystallinity of 60% or more, and pilling may occur on cloth manufactured using the spun yarn.

On the other hand, when the total draw ratio exceeds 15, yarn breakage may occur, and the strength of the finally obtained polyethylene yarn is insufficient, so that the weavability of the polyethylene yarn is not good, and the cloth made using the polyethylene yarn is too hard. Therefore, the user may feel uncomfortable.

When measuring the linear velocity of the first godet roll GR1 at the spinning speed of the melt spinning of the present invention, the linear velocity of each of the remaining godet rolls is appropriately measured in the multi-stage drawing unit 500 such that A total draw ratio of 2 to 20 and preferably 3 to 15 may be applied to the multifilament 10 .

According to an exemplary embodiment of the present invention, it is possible to perform the multi-stage drawing process by appropriately setting the temperatures of the godet rolls GR1 to GRn in the multi-stage drawing unit 500 within the range of 40°C to 140°C. Heat setting of polyethylene yarn by stretching unit 500. Specifically, for example, a multistage stretching unit may contain three or more (and specifically, three to five) stretching zones. Additionally, each of the draw sections may contain multiple godet rolls.

In particular, for example, a multi-stage stretching unit may contain four stretching zones. The polyethylene yarn may be drawn at a total draw ratio of 7 to 15 in the first drawing section to the third drawing section, and then, the drawn polyethylene yarn may be drawn in the fourth drawing section It is subjected to 1% to 3% shrinkage and stretching (relaxation). The total draw ratio refers to the final draw ratio of the fiber passing through the first draw zone to the third draw zone relative to the undrawn fiber.

More specifically, in the first stretching section, stretching may be performed at 40°C to 130°C, and a total stretching ratio may be 2 to 5. In the second stretching section, stretching may be performed at a temperature higher than that in the first stretching section, and specifically, stretching may be performed at 100°C to 150°C, and stretching may be performed such that The total draw ratio is 5 to 8. In the third stretching section, the stretching may be performed at 100° C. to 150° C., and the stretching may be performed so that the total stretching ratio is 7 to 15. In the fourth stretching section, stretching may be performed at a temperature equal to or lower than that of the second stretching section, and specifically, stretching may be performed at 80°C to 140°C, and 1% To 3% shrink stretch (relax).

The multi-stage drawing and heat setting of the multi-filament 10 are simultaneously performed by the multi-stage drawing unit 500, and the multi-stage drawn multi-filament 10 is wound around the winder 600, thereby completing the polyethylene yarn of the present invention .

The functional cloth according to the present invention comprises the polyethylene yarns described above. Functional fabrics contain polyethylene yarns with excellent thermal conductivity and sweat-absorbing and quick-drying properties, so that functional fabrics can have a cool feeling, sweat-absorbing and quick-drying properties, and can quickly discharge moisture produced by sweating or breathing. When the user wears the product made of this fabric, moisture and heat can be quickly discharged to the outside to relieve the feeling of humidity and heat, so that the user can feel comfortable.

The polyethylene yarn described above may be used alone to manufacture the functional cloth according to the present invention, and may further include spinning yarns different from the polyethylene yarn in order to further impart another functionality. In terms of both better cooling feeling and sweat-absorbing and quick-drying properties, it is better to use polyethylene yarn alone.

Specifically, the functional fabric may have a cool-to-touch feel of 0.1 W/cm2 to 0.5 W/cm2, and more specifically 0.15 W/cm2 when measured at 20±2°C and 65±2% R.H. cm2 to 0.3 W/cm2. In addition, when measured at 20 ± 2°C and 65 ± 2% R.H, the heat flux of functional fabrics may range from 95 watts/square meter to 150 watts/square meter, and specifically 100 watts/square meter m to 120 watts/sq. When the functional fabric having a cooling feeling is worn by the user after being manufactured or processed into a product, the functional fabric can provide the user with an excellent cooling feeling to feel comfortable in a high-temperature environment.

In addition, when measured by method B of KS K 0642 8.26, the moisture absorption rate of the functional fabric may be 80 mm/10 minutes to 160 mm/10 minutes, and specifically 100 mm/10 minutes to 130 mm/10 minutes 10 minutes. Functional cloth has a higher moisture absorption rate than cotton yarn, about 50 mm/10 minutes under the same conditions, and has remarkably excellent moisture absorption capacity.

In addition, when measured according to A method of KS K 0642 8.25, the moisture drying rate of the functional fabric is 20 mm/10 minutes to 50 mm/10 minutes, and specifically 30 mm/10 minutes to 40 mm/10 minutes , which is a relatively fast moisture drying rate. Therefore, moisture can be smoothly discharged. As described above, functional fabrics with faster moisture absorption rate and moisture drying rate have significantly excellent sweat-absorbing and quick-drying characteristics, and can quickly absorb and discharge moisture generated by sweating or breathing.

The functional fabric may be a woven or knitted fabric with a weight per unit area (ie, areal density) of 150 grams/square meter to 800 grams/square meter. When the area density of the cloth is less than 150 g/m 2 , the density of the cloth is insufficient and there are many holes in the cloth, and thus the coolness of the cloth is reduced by the holes. On the other hand, when the areal density of the cloth is more than 800 g/m2, the cloth becomes stiff due to the over-dense structure of the cloth, and thus the user feels uncomfortable, and problems in use arise due to heavy weight.

This fabric can be processed into sweat-absorbing and quick-drying products that require both sweat-absorbing and quick-drying properties and cool feeling. The product can be any textile product according to the prior art, and preferably it can be summer wear, sportswear, mask and work wear to impart a cooling sensation to the human body and sweat-wicking and quick-drying properties.

In the above, although the present invention has been described by way of specific matters, exemplary embodiments, and drawings, they are only for helping to fully understand the present invention. Therefore, the invention is not limited to the exemplary embodiments. Those skilled in the art can make various modifications and changes related to the present specification to the present invention.

Accordingly, the spirit of the invention should not be limited to the described exemplary embodiments, but the claims and all modifications equivalent or equivalent to the claims are intended to be within the scope and spirit of the invention. [Measurement of physical properties of spinning yarn] ＜1. Weight average molecular weight (Mw) (gram/mole) and polydispersity index (PDI)＞

Polyethylene yarns were completely dissolved in the following solvents, and then gel permeation chromatography (GPC) was used to calculate the weight average molecular weight (Mw) and polydispersity index (Mw/Mn:PDI ). - Analyzer: HLC-8321 GPC/HT, Tosoh Corporation - Column: PLgel Shield (7.5 × 50 mm) + 2 × PLgel Mix-B (7.5 × 300 mm) - Column temperature: 160°C - Solvent: Trichlorobenzene (TCB) + 0.04 wt% Butylated Hydroxytoluene (BHT) (after drying with 0.1% CaCl ₂ ) - Syringe and detector temperature: 160°C - Detector: RI Detector-Flow rate: 1.0ml/min-Injection volume: 300ml-Sample concentration: 1.5mg/ml-Standard sample: Polystyrene <2. Strength (g/Dani)>

Stress-strain curves for polyethylene yarns were obtained using a Universal Tensile Tester (Instron Engineering Corp, Canton, Mass.) according to ASTM D2256 method. The sample length was 250 mm, the tension speed was 300 mm/min, and the initial load was set at 0.05 g/denier. The strength (grams/denier) is calculated from the stress and elongation at the breaking point. 5 measurements were performed for each spin and the average value was calculated. ＜3. Crystallinity＞

The crystallinity of polyethylene yarns was measured using an X-ray diffractometer (XRD) [manufacturer: Malvern Panalytical, model name: EMPYREAN]. Specifically, a polyethylene yarn was cut to prepare a sample having a length of 2.5 cm, the sample was fixed to a sample holder, and measurement was performed under the following conditions. - Light source (X-ray source): Cu-Kα radiation - Power: 45kV x 25mA -Mode: continuous scan mode - Scanning angle range: 10° to 40° - Scanning speed: 0.1°/sec ＜4. Melt index＞

Melt index was measured according to ASTM D1238 at 190°C and 2.16 kg. [Measurement of physical properties of fabric] ＜1. Cooling sensation on contact＞

According to the requirements, the Korea Apparel Testing & Research Institute (KATRI) used KES-F7 (Thermo Labo II) equipment to measure the coolness of contact in a test environment of 20 ± 2°C and 65% ± 2% R.H.

Specifically, a cloth sample with a size of 20 cm x 20 cm was prepared, and the cloth sample was left to stand for 24 hours at a temperature of 20 ± 2° C. and a RH of 65 ± 2%. Then, use the KES-F7 THERMO LABO II (Kato Tech Co., Ltd.) equipment to measure the contact cooling feeling of the cloth in a test environment with a temperature of 20 ± 2°C and a RH of 65 ± 2%. (Q max). Specifically, as shown in FIG. 3 , a fabric sample 23 was placed on a base plate (also referred to as a "Water-Box") 21 maintained at 20°C, and heated to a T of 30°C. The box 22a (contact area: 3 cm x 3 cm) was placed on the cloth sample 23 for only 1 second. That is, one surface of the cloth sample 23 having the other surface in contact with the bottom plate 21 is immediately brought into contact with the T-box 22a. The contact pressure applied to the fabric sample 23 by the T-box 22a was 6 gf/cm2. Subsequently, the Q maximum value displayed on a monitor (not shown) connected to the device was recorded. This test was repeated 10 times and the arithmetic mean of the Qmax was calculated. ＜2. Heat flux＞

The thermal mannequin was placed in a climate chamber, and the heat flux was measured in a test environment of 20 ± 2°C and 65 ± 2% R.H.

Specifically, as shown in Figure 4, a male thermal manikin was placed at the center of the climatic chamber at 20±2°C and 65±2% R.H. Then, the temperature of the thermal mannequin was set to 33.7° C., and the thermal mannequin was heated by applying power.

Thereafter, a size 95 sample of men's tops was prepared, which was then placed on the heated mannequin, and the surface temperature of the heated mannequin and the power value used to maintain the temperature of the heated mannequin for 30 minutes were used to determine the The heat flux (watts/square meter) is measured at one-minute intervals. The heat flux is the amount of heat energy consumed per unit area (1 square meter) in unit time (1 minute). ＜3. Moisture absorption rate＞

The moisture absorption rate of the fabric is measured according to B method of KS K 0642 8.26.

Specifically, five identical fabric samples having a size of 20 cm x 2.5 cm were prepared, and the samples were fixed at a constant height by means of horizontal strips so that one end of the sample touched the water surface of a container containing distilled water at 20 ± 2°C therein . After the elapse of 10 minutes, the height the water has risen due to capillary action is measured and averaged. ＜4. Moisture drying rate＞

According to the A method of KS K 0642 8.25, the moisture drying rate of the fabric is measured.

Specifically, three test pieces with a size of 4 cm×4 cm were prepared, and then immersed in distilled water at 20±2° C. in an unfolded state to fully absorb moisture into the test pieces. Thereafter, when there is no more water drop falling, the test piece is taken out from the distilled water, the test piece is installed on the drying time measuring equipment, and then the test piece is left to stand under the conditions of 20 ± 2°C and 65 ± 2% R.H in the test room. Measure the time until the test piece is naturally dried to a constant weight. [instance 1] ＜Manufacture of polyethylene yarn＞

A polyethylene yarn comprising 200 filaments and having a total fineness of 150 denier was produced.

First, polyethylene wafers are injected into the extruder 100 and melted. Molten polyethylene was extruded through a die 200 having 200 holes. The mold temperature was 270°C. In this case, the nozzle of the mold is Y-shaped.

In the first cooling zone, the long filament 11 formed when being discharged through the nozzle hole of the mold 200 is cooled to 50° C. by the cooling wind with a wind speed of 0.9 m/s; The filament 11 is cooled to 35° C. with a cooling wind of 0.5 m/s; and in the third cooling zone, the filament 11 is finally cooled to 25° C. ℃. After cooling, the filaments are interwoven into multifilaments by means of an interlacer.

Subsequently, the multifilament is transferred to the drawing unit 500 . The stretching unit 500 is a multi-stage stretching unit comprising four sections. Specifically, in the first stretching zone, the multifilament was drawn at a maximum stretching temperature of 80°C with a total draw ratio of 3; in the second stretching zone, at a maximum stretching temperature of 120°C The multifilament is stretched at a temperature with a total draw ratio of 7; in the third stretching section, the multifilament is drawn at a maximum draw temperature of 130° C. with a total draw ratio of 10; and in the fourth draw In the section, the multifilament was subjected to drawing and heat setting at a maximum drawing temperature of 120° C. so that the multifilament shrank and stretched (relaxed) 2% relative to the multifilament in the third drawing section.

Subsequently, the drawn multifilament is wound around a winder 600 . The winding tension is 0.8 g/denier.

An optical micrograph of a cross-section of the fabricated spun yarn is shown in FIG. 5 . Measuring the physical properties of the manufactured spun yarn. The results are shown in Table 1. ＜Manufacturing functional fabrics＞

The produced polyethylene yarn is woven to produce a functional fabric with an area density of 500 grams per square meter. Measuring the physical properties of manufactured functional fabrics. The results are shown in Table 3. [Example 2 to Example 5]

Cloths were manufactured in the same manner as in Example 1 except that the spinning conditions were changed as shown in Table 1. In addition, physical properties of the manufactured cloth were measured in the same manner as in Example 1. The results are shown in Table 3. [Example 6]

A spun yarn and a cloth were produced in the same manner as in Example 1 except that a >-< type nozzle was used as the die nozzle in Example 1. In addition, the physical properties of the manufactured yarn and fabric are measured. The results are shown in Table 1 and Table 3. [Comparative example 1]

A spun yarn and a cloth were manufactured in the same manner as in Example 1 except that a circular nozzle was used as the die nozzle in Example 1. The physical properties of the spun yarns are shown in Table 2. In addition, physical properties of the manufactured cloth were measured in the same manner as in Example 1. The results are shown in Table 4. [Comparative example 2]

Polyethylene terephthalate (PET) fibers having the same cross-sectional shape and size as those in Example 1 were prepared, and then cloth was produced in the same manner as in Example 1. The physical properties of the spun yarns are shown in Table 2. The physical properties of the manufactured cloth were measured in the same manner as in Example 1. The results are shown in Table 4. [Comparative example 3]

Polyethylene terephthalate (PET) fibers having the same cross-sectional shape and size as those in Example 1 and containing titanium dioxide (TiO ₂ ) added as an absorbent additive were prepared, and then prepared as in Example 1 Cloth is made in the same way. The physical properties of the spun yarns are shown in Table 2. The physical properties of the manufactured cloth were measured in the same manner as in Example 1. The results are shown in Table 4. [Comparative example 4]

The spun 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 was satisfied as shown in Table 2 in Example 1. Measuring the physical properties of manufactured fabrics. The results are shown in Table 4. [Table 1] Classification Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Physical Properties of Spinning Yarn PDI 9.82 10.11 10.23 9.74 9.88 9.71 Mw (gram/mole) 311654 308542 313451 316321 309991 315642 Crystallinity (%) 75.2 75.7 74.1 74.9 75.3 75.1 Melt index (g/10min) 1.1 1.8 1.2 1.5 1.4 1.5 Strength (grams/denier) 11.5 11.2 10.8 11.4 11.3 10.6 cross section of filament shape clover shape clover shape clover shape clover shape clover shape Clover shape R2/R1 ratio 2.81 3.10 2.12 2.24 2.79 2.36 [Table 2] Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Physical Properties of Spinning Yarn Material PE PET PET + TiO ₂ PE Crystallinity (%) 75.2 48.7 48.7 55.1 Strength (grams/denier) 11.5 3.4 3.5 3.4 spinning cross section Section shape round shape clover shape clover shape clover shape R2/R1 ratio of section - 1.65 1.78 1.98 [table 3] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Physical Properties of Spinning Yarn Cooling sensation on contact (W/cm²) 0.2 0.19 0.18 0.17 0.18 0.21 Heat Flux (W/m²) 112 102 107 114 109 114 Moisture Absorption Rate (mm/min) 125 108 107 115 112 127 Moisture drying rate (mm/min) 32 28 26 30 34 31 [Table 4] Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Physical Properties of Spinning Yarn Cooling sensation on contact (W/cm²) 0.2 0.12 0.13 0.10 Heat Flux (W/m²) 114 80 90 87 Moisture Absorption Rate (mm/min) 45 99 101 111 Moisture drying rate (mm/min) 11 twenty four 27 30

Referring to Table 1 to Table 4, in the cloth manufactured using the spun yarn according to each of the Examples of the present invention, it was confirmed that the cool feeling to the touch was high and the sweat-absorbing and quick-drying property was excellent. Therefore, the cloth manufactured using the spun yarn according to each of the Examples can provide a user with a remarkably excellent cooling sensation.

On the other hand, in the cloth according to Comparative Example 1, it was confirmed that the value of the cooling feeling on contact was similar to that of the example, but the moisture was not removed quickly due to the low moisture absorption rate and the low moisture drying rate, and thus by The cooling sensation felt by the user decreases.

In Comparative Example 2 and Comparative Example 3, it has been proved that the fabric is significantly less likely to be used as a product with cooling feel and sweat-absorbing and quick-drying properties due to the reduced cooling to contact and lower heat flux and moisture absorption and drying rate .

In the above, although the present invention has been described by way of specific matters, exemplary embodiments, and drawings, they are only for helping to fully understand the present invention. Therefore, the invention is not limited to the exemplary embodiments. Those skilled in the art can make various modifications and changes related to the present specification to the present invention.

Accordingly, the spirit of the invention should not be limited to the described exemplary embodiments, but the claims and all modifications equivalent or equivalent to the claims are intended to be within the scope and spirit of the invention.

1: filament 10: central body 10a: inscribed circle 30: protrusion 30a: circumscribed circle 21: bottom plate 22a: T box 23: fabric sample R ₁ : first radius R ₂ : second radius

Fig. 1 is a sectional view of a filament of a polyethylene yarn having a set cross section according to Example 1 of the present invention. Fig. 2 is a cross-sectional view of a filament of a cross-section polyethylene yarn according to Example 2 of the present invention. Fig. 3 is a schematic diagram showing an apparatus for measuring the cool-to-touch feeling of cloth. Figure 4 is a photograph showing a thermal mannequin test for measuring the thermal reflow of a fabric. FIG. 5 is an optical micrograph obtained by enlarging a section of a filament of polyethylene yarn having a shaped cross-section shown in FIG. 1 .

1: Filament

10: centrosome

10a: Inscribed circle

30: protrusion

30a: circumscribed circle

R ₁ : first radius

R ₂ : second radius

Claims (11)

A polyethylene yarn comprising a filament having a central body and two or more protrusions protruding from the central body based on a section perpendicular to the longitudinal direction, Wherein the crystallinity of the polyethylene yarn is 60% to 85%. The polyethylene yarn according to claim 1, wherein based on the section of the polyethylene yarn perpendicular to the longitudinal direction, the first radius (R1) of the inscribed circle formed by the central body and the The second radius (R2) of the circumscribed circle formed by the central body and the protrusion in the central body satisfies the following expression: [expression] 1.2 ≤ R2/R1 ≤ 3.5. The polyethylene yarn of claim 1, wherein the polyethylene yarn has a melt index (MI, @190°C). The polyethylene yarn of claim 1, wherein the polyethylene yarn has a polydispersity index (PDI) of 5 to 30. The polyethylene yarn of claim 1, wherein the polyethylene yarn has a tenacity of 5 grams/denier to 15 grams/denier when measured according to ASTM D2256. A functional cloth, comprising the polyethylene yarn according to any one of claims 1 to 5. The functional fabric as claimed in item 6, wherein when measured at 20 ± 2°C and 65 ± 2% R.H, the functional fabric has a cooling sensation on contact of 0.1 watts/cm2 to 0.5 watts/cm2 (Q max). The functional fabric according to claim 6, wherein the functional fabric has a heat dissipation rate of 95 watts/square meter to 150 watts/square meter when measured at 20±2°C and 65±2% R.H flux. The functional cloth according to claim 6, wherein the functional cloth has a moisture absorption of 80 mm/10 minutes to 160 mm/10 minutes when measured according to the Byreck method which is method B of KS K 0642 8.26 rate. The functional fabric according to claim 6, wherein the functional fabric has a moisture drying rate of 20 mm/10 minutes to 50 mm/10 minutes when measured according to the A method of KS K 0642 8.25. A sweat-absorbing and quick-drying product made of the functional cloth as described in Claim 6.