US20230357965A1 - Cut-resistant polyethylene yarn

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Abstract

Description

Claims

US20230357965A1

Publication number: US20230357965A1
Application number: US18/043,029
Authority: US
Inventors: Sinho LEE; Young Soo Lee; Seong-Young Kim; Jung Eun Park
Original assignee: Kolon Industries Inc
Current assignee: Kolon Industries Inc
Priority date: 2020-12-30
Filing date: 2021-12-29
Publication date: 2023-11-09
Also published as: CN116324056A; TW202235708A; TWI821846B; WO2022146042A1; EP4183907A4; EP4183907A1; KR20220097301A; JP2023543296A

Provided is a cut-resistant polyethylene yarn, and more particularly, a cut-resistant polyethylene yarn which allows manufacture of a product having both excellent cut resistance and excellent wear resistance.

TECHNICAL FIELD

The following disclosure relates to a cut-resistant polyethylene yarn, and more particularly, to a cut-resistant polyethylene yarn which allows manufacture of a product having both excellent cut resistance and excellent wear resistance.

BACKGROUND ART

Those who work in high-risk industrial fields such as metal and glass working shops and butcher shops or those who work in the security and disaster fields such as police, military, or firefighters wear cut-resistant gloves or clothing, in order to protect the human body from deadly weapons or sharp cutting tools such as knives.
In general, as a means of imparting cut resistance, products formed of high-strength spun yarn such as aramid fiber have been developed, but they do not have sufficient cut resistance to be used in the sites of a high-risk group. Meanwhile, various products using metallic yarn have also been developed, but they lack flexibility and may not be substantially applied to work sites where workers' hands are often used.
Thus, as disclosed in Japanese Patent Laid-Open Publication No. 2002-180324, a glove using polyethylene yarn having high elastic modulus and strength has been suggested, but since its cut resistance is not good enough to be substantially used in the industrial fields of a high risk group, its usability is poor.
In addition, when polyethylene yarn which has been developed with a focus only on strength improvement is manufactured for a protective product and used, it is prone to lint, and thus, it is difficult to use the yarn repeatedly for a long time.

RELATED ART DOCUMENTS

Patent Documents

(Patent Document 1): Japanese Patent Laid-Open Publication No. 2002-180324

SUMMARY OF INVENTION

Technical Problem

An embodiment of the present invention is directed to providing a polyethylene yarn having excellent cut resistance and improved wear resistance.

Solution to Problem

In one general aspect, a cut-resistant polyethylene yarn having the following properties is provided: in a graph of a storage modulus (G′) according to an angular frequency (ω), the storage modulus of 10 Pa to 100 Pa at the angular frequency of 1 rad/s, and the storage modulus of 100 Pa to 1000 Pa at the angular frequency of 1 rad/s; and in a graph of tan δ according to an angular frequency (ω), tan δ of 9 or more at the angular frequency of 0.1 rad/s.
In the cut-resistant polyethylene yarn according to an exemplary embodiment of the present invention, polyethylene may have, in a graph of a loss modulus (G″) according to an angular frequency (ω), the loss modulus of 100 Pa to 700 Pa at the angular frequency of 0.1 rad/s, and a point at which the loss modulus is 1000 Pa in a section of the angular frequency of 0.25 to 0.5 rad/s.
In the cut-resistant polyethylene yarn according to an exemplary embodiment of the present invention, polyethylene may have, in a graph of a complex viscosity (η*) according to an angular frequency (w), the complex viscosity of 3000 Pa·s to 6000 Pa·s at the angular frequency of 0.1 rad/s, and an average gradient of −1000 to −300 in a section of the angular frequency of 0.1 rad/s to 1 rad/s.
In the cut-resistant polyethylene yarn according to an exemplary embodiment of the present invention, the polyethylene yarn may have a fineness of 1 to 3 denier per filament (DPF).
In the cut-resistant polyethylene yarn according to an exemplary embodiment of the present invention, in a graph of a phase angle according to a multiple shear modulus (G*), the phase angle may be 75 to 90° at the multiple shear modulus (G*) of 350 to 1000 Pa.
In the cut-resistant polyethylene yarn according to an exemplary embodiment of the present invention, the number of fluff occurrences may be 20 EA/50,000 m or less.
In another general aspect, a cut-resistant fabric includes the cut-resistant polyethylene yarn described above.
In the cut-resistant fabric according to an exemplary embodiment of the present invention, the fabric may have a cut resistance of 5.5 N or more as measured according to the standard of ISO13997:1999.
In still another general aspect, a protective product includes the cut-resistant polyethylene fabric described above.
The protective product according to an exemplary embodiment of the present invention may be a cut-resistant glove.

Advantageous Effects of Invention

Since the cut-resistant polyethylene yarn according to the present invention has excellent cut resistance, it allows manufacture of fiber products which may be substantially applied to industrial and disaster sites of a high risk group.
In addition, the cut-resistant polyethylene yarn according to the present invention allows manufacture of products having high wear resistance.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 to FIG. 5 are graphs of results of measuring rheological properties of the cut-resistant polyethylene yarn according to an exemplary embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

Technical terms and scientific terms used in the present specification have the general meaning understood by those skilled in the art to which the present invention pertains unless otherwise defined, and a description for the known function and configuration obscuring the gist of the present invention will be omitted in the following description and the accompanying drawings.
In addition, the singular form used in the present specification may be intended to also include a plural form, unless otherwise indicated in the context.
In addition, units used in the present specification without particular mention are based on weights, and as an example, a unit of % or ratio refers to a wt % or a weight ratio and wt % refers to wt % of any one component in a total composition, unless otherwise defined.
In addition, the numerical range used in the present specification includes all values within the range including the lower limit and the upper limit, increments logically derived in a form and span in a defined range, all double limited values, and all possible combinations of the upper limit and the lower limit in the numerical range defined in different forms. Unless otherwise defined in the specification of the present invention, values which may be outside a numerical range due to experimental error or rounding of a value are also included in the defined numerical range.
The term “comprise” in the present specification is an open-ended description having a meaning equivalent to the term such as “is/are provided”, “contain”, “have”, or “is/are characterized”, and does not exclude elements, materials, or processes which are not further listed.
Cut resistance means durability against cuts by a blade of a knife or an object with sharp portions such as a blade, and those who work in high-risk industrial fields such as metal and glass working shops and butcher shops or those who work in the security and disaster fields such as police, military, or firefighters wear cut-resistant gloves or clothing, in order to protect the human body from deadly weapons or sharp cutting tools such as knives.
Conventionally, a cut-resistant fiber product using a polyethylene yarn having high elastic modulus and strength has been developed, but since its cut resistance is not good enough to be used substantially in the industrial fields of a high risk group, its usability is poor.
In addition, since the product manufactured of the polyethylene yarn developed with a focus only on strength improvement has low wear resistance, it is prone to lint, and thus, it is difficult to use the product repeatedly for a long time.
Thus, the present applicant intensively conducted a study for a long time in order to develop a polyethylene yarn having excellent cut resistance and wear resistance, and as a result, found that a polyethylene yarn having specific rheological properties allows manufacture of a product having both excellent cut resistance and excellent wear resistance, and thus, deepened the study, thereby completing the present invention.
The polyethylene yarn in the present specification refers to mono- and multifilament manufactured by a process such as spinning and drawing, using polyethylene chips as a raw material. As an example, the polyethylene yarn may include 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.
The rheological properties in the present specification refer to a storage modulus (G′), a loss modulus (G″), tan δ, a complex viscosity (η*), and a phase angle)(°, and unless otherwise defined in the present specification, the rheological may be measured using DHR-2 (TA Instrument). Geometry used in the measurement is plate-plate (parallel plate, PP), which measures the storage modulus (G′), the loss modulus (G″), tan δ, the complex viscosity (η*), and the phase angle depending on an angular velocity change. Unless otherwise defined, the rheological properties may be measured at a temperature of 250° C. under a nitrogen atmosphere, and a measurement specification (sample dimension) may be a diameter of 25 mm, a gap point of 1.0 mm, and a strain of 10%.
The cut-resistant polyethylene yarn of the present invention may have the following properties: in a graph of a storage modulus (G′) according to an angular frequency (ω), the storage modulus of 10 Pa to 100 Pa at the angular frequency of 0.1 rad/s, and the storage modulus of 100 Pa to 1000 Pa at the angular frequency of 1 rad/s; and in a graph of tan δ according to an angular frequency (ω), tan δ of 9 or more at the angular frequency (ω) of 0.1 rad/s. The polyethylene yarn as such may be manufactured into a product having excellent wear resistance as well as excellent cut resistance.
The cut resistance of a product including the polyethylene yarn according to the present invention may be determined by not only the strength of the polyethylene yarn but also slippage of the polyethylene yarn, that is, a characteristic in which when a sharp tool such as a blade of a knife passes over the polyethylene yarn, the tool slides along the surface without being caught in the yarn, and rolling of yarns, that is, a characteristic in which when a sharp tool such as a blade of a knife passes over the yarn, the yarn is twisted or curled around the longitudinal axis of the yarn.
The polyethylene yarn according to the present invention has the above ranges in the graphs of the storage modulus and tan δ according to the angular frequency, thereby allowing manufacture of a product having excellent slippage and rolling characteristics and having excellent cut resistance.
Specifically, in the graph of the storage modulus (G′) according to the angular frequency (ω), the storage modulus may be 20 Pa to 80 Pa, and more specifically 30 Pa to 50 Pa at the angular frequency of 0.1 rad/s. Here, the storage modulus may have a positive (+) gradient on average. Specifically, the storage modulus may have a positive (+) gradient on average in a section of the angular frequency of 0.1 rad/s to 1000 rad/s. The yarn having the physical properties as such may show sufficient elasticity to have cut resistance and have relatively excellent strength. Specifically, in the graph of the storage modulus according to the angular frequency, when the angular frequency (ω) and the storage modulus (G′) values are converted into logarithmic values, the average gradient of the storage modulus (log G′) may be 0.9 to 1.6, specifically, 1.1 to 1.5 in the section of the angular frequency (log w) of 0 to 1 rad/s.
When the storage modulus is higher than the above range, the strength is improved but stiffness is also raised, and thus, when a fabric is manufactured by weaving or braiding, the fabric is stiff, so that it is difficult to process the fabric into a desired product and a product wearer may feel uncomfortable.
Here, in the graph of tan δ according to the angular frequency (ω), tan δ may have a negative (−) gradient on average, and more specifically, may have a negative (−) gradient on average in the section of 0.1 rad/s to 1000 rad/s. That is, the polyethylene yarn according to the present invention has, in the graph of tan δ according to the angular frequency (ω), a gradient value having a relatively high absolute value, and does not form an inflection point unlike other polyethylenes. It means that the polyethylene yarn as such shows a relatively high viscosity as compared with elasticity. Specifically, it means that entanglement between high molecular chains or gel is easily arranged in a flowing direction even at a low shear stress, and thus, there is substantially no entanglement between high molecular chains or gel in the polyethylene yarn. Since the polyethylene yarn has the rheological properties as such, the yarn has substantially no or very little gel, thereby preventing formation of fluff in drawing.
Here, the yarn may have, in the graph of tan δ according to the angular frequency (ω), tan δ of 9 or more and less than 15, specifically 9 to 12 at the angular frequency of 0.1 rad/s, but is not limited thereto.
The angular frequency when a tan δ value is 1 may be 200 to 500 rad/s, specifically 250 to 400 rad/s. Since the section of the angular frequency with the tan δ value of 1 is relatively large, the viscosity is better than the viscosity of the polyethylene yarn commonly used in the art, and the polyethylene yarn may have substantially no entanglement between polyethylene high molecular chains and have excellent high molecular chain arrangement. Since the yarn as such has excellent arrangement between high molecular chains, it allows manufacture of fabric having better slippage and rolling characteristics. The fabric manufactured from the yarn as such has excellent cut resistance, thereby preventing damage of fabric by pilling in which lint occurs even when repeated external force is applied by a blade of a knife or a sharp object.
The polyethylene yarn may have, in the graph of the loss modulus (G″) according to the angular frequency (ω), the loss modulus of 100 Pa to 700 Pa, specifically 200 Pa to 500 Pa at the angular frequency of 0.1 rad/s, and may show a point in which the loss modulus is 1000 Pa in the section of the angular frequency of 0.25 rad/s to 0.5 rad/s.
In addition, in the graph of the loss modulus according to the angular frequency, when the angular frequency (ω) and the loss modulus (G″) values are converted into logarithmic values, the average gradient of the loss modulus (log G″) may be 0.75 to 0.9 in the section of the angular frequency (log ω) of 0 to 1 rad/s.
In addition, in the graph of the complex viscosity (η) according to the angular frequency (ω), the complex viscosity may be 3000 Pas to 6000 Pa·s, specifically 3700 Pa·s to 5000 Pa·s at the angular frequency of 0.1 rad/s, and the average gradient may be −1000 to −300, specifically −800 to −500 in the section of the angular frequency of 0.1 rad/s to 1 rad/s.
In addition, in the graph of the phase angle (°) according to the multiple shear modulus (G*), the phase angle may be 60 to 90°, specifically 75 to 90° at the multiple shear modulus (G*) of 350 to 1000 Pa.
By having the loss modulus and the complex viscosity as such, the present invention may have a melt viscosity allowing easy melt spinning and may suppress defect occurrence by a spinning process.
The polyethylene yarn according to the present invention may have a weight average molecular weight (Mw) of 80,000 g/mol to 180,000 g/mol, specifically, 100,000 g/mol to 170,000 g/mol, and more specifically, 120,000 g/mol to 160,000 g/mol.
In addition, the polyethylene yarn may be a high-density polyethylene (HDPE) having a density of 0.941 to 0.965 g/cm³, and a crystallinity of 55 to 85%, preferably 60 to 85%.
In addition, the polyethylene yarn may have a polydispersity index (PDI) of more than 5 and less than 9. The polydispersity index (PDI) is a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn), and is also referred to as a molecular weight distribution index (MWD). When PDI is less than 5, flowability is not good due to a relatively narrow molecular weight distribution and has poor processability at the time of melt extrusion, resulting in thread trimming due to non-uniform discharge. On the contrary, when PDI is more than 9, melt flowability and processability at the time of melt extrusion are better due to a large molecular weight distribution, but a low molecular weight polyethylene is included too much, which may reduce the tensile strength of the finally obtained a polyethylene yarn.
The polyethylene yarn of the present invention as such may have a tensile strength of 3.5 to 8.5 g/de, a tensile modulus of 15 to 80 g/de, and an elongation at break of 14 to 55%. When the tensile strength is more than 8.5 g/de, the tensile modulus is more than 80 g/de, or the elongation at break is less than 14%, wearability of the polyethylene yarn is not good, and the fabric manufactured using the yarn is excessively stiff, causing a user to feel uncomfortable. On the contrary, when the tensile strength is less than 3.5 g/de, the tensile modulus is less than 15 g/de, or the elongation at break is more than 55%, lint is formed on the fabric manufactured from the polyethylene yarn when the fabric is continuously used by a user.
The polyethylene yarn of the present invention may have a circular cross-section or a non-circular cross-section, but it is preferred to have a circular cross-section for excellent slippage characteristics.
In addition, the polyethylene yarn of the present invention may have a strength of 11 g/d or more, specifically 13 g/d or more so that the product manufactured using the yarn has a cutting force of 5 or more.
A method of manufacturing yarn of the present invention is not limited as long as it is a method of manufacturing yarn using polyethylene known in the art. As a specific example, the yarn may be manufactured by including: melting polyethylene chips to obtain polyethylene melt; extruding the polyethylene melt by a spinneret having a plurality of nozzle holes; cooling a plurality of filaments formed when the polyethylene melt is discharged from nozzle holes; sizing the plurality of cooled filaments to form a multifilament yarn; drawing the multifilament yarn at a total drawing ratio of 5 to 20 times and heat setting the drawn multifilament yarn; and winding the drawn multifilament yarn. Here, the drawing step is performed by multi-stage drawing, and a relaxation ratio at the last stage drawing in the multi-stage drawing may be 3% to 8% or less, but is not limited thereto. The relaxation ratio at the last stage drawing refers to a relaxation ratio at the time of drawing which is finally performed after the drawing and before the winding.
The polyethylene melt is transported to a spinneret having a plurality of nozzle holes by a screw in an extruder, and then is extruded through the nozzle holes. The number of holes of the spinneret may be set depending on the denier per filament (DPF) and the total fineness of the yarn to be manufactured. As a specific example, in order to manufacture a yarn of 1 to 3 DPF having a total fineness of 100 to 1,000 denier, a spinneret 200 may have 40 to 500 nozzle holes.
The melting process in the extruder and the extrusion process by the spinneret may be performed at 150 to 315° C., preferably 250 to 315° C., and more preferably 260 to 290° C. When the spinning temperature is lower than 150° C., polyethylene chips are not melted uniformly due to the low spinning temperature, so that the spinning may be difficult. However, when the spinning temperature is higher than 315° C., thermal decomposition of polyethylene occurs, so that high strength expression may be difficult.
Filaments may be cooled in an air cooling manner. For example, the filaments may be cooled at 15 to 40° C., using a cooling air at a wind speed of 0.2 to 1 m/sec. When the cooling temperature is lower than 15° C., elongation is insufficient due to supercooling so that breakage may occur in a subsequent drawing process, and when the cooling temperature is higher than 40° C., a fineness deviation between filaments is increased due to solidification unevenness and breakage may occur in the drawing process.
Before the multifilament yarn is formed, an oiling process of imparting an oil agent to the cooled filaments using an oil roller (OR) or an oil jet may be further performed. The oil agent impartment step may be performed by a metered oiling (MO) method.
In addition, before the multifilament yarn is wound on a winder, an interlacing process by an interlacing device may be further performed in order to improve sizing and weaving of the polyethylene yarn.
The polyethylene yarn manufactured by the method is braided or woven to manufacture a fabric having cut resistance.
Specifically, the polyethylene fabric according to the present invention may be knitted into a covered yarn. The covered yarn is not limited as long as it contains the polyethylene yarn of the present invention, but as an example, may be formed by including the polyethylene yarn of the present invention, a polyurethane yarn (e.g., Spandex) which spirally surrounds the polyethylene yarn, and a polyamide yarn (e.g., nylon 6 or nylon 66) which spirally surrounds the polyethylene yarn. Depending on the properties of the product to be desired, a polyester yarn (e.g., PET yarn) may be included instead of the polyamide yarn.
Here, the polyethylene yarn may have a weight of 45 to 85% of the total weight of the covered yarn, the polyurethane yarn may have a weight of 5 to 30% of the total weight of the covered yarn, and the polyamide or polyester yarn may have a weight of 5 to 30% of the total weight of the covered yarn, but are not limited thereto.
Meanwhile, the fabric according to the present invention may be a woven fabric or a knitted fabric having a weight per unit area (that is, surface density) of 150 to 800 g/m². When the fabric has a surface density of less than 150 g/m², fabric compactness is insufficient and many pores exist in the fabric, and these pores reduce the cut resistance of the fabric. However, when the fabric has a surface density of more than 800 g/m², the fabric is very stiff due to the excessively dense structure of the fabric, problems with a user's tactile sensation occur, and problems in use are caused due to its high weight.
The fabric as such may be processed into a product requiring excellent cut resistance. The product may be any conventional fiber product, but preferably, may be protective gloves or clothing for performing a protective function for the human body.
The protective product of the present invention has excellent cut resistance of a cut load of 5.5 N or more, more preferably 5.6 N to 9 N, and also has a low stiffness of 5 gf or less, more preferably 2 to 5 gf, thereby showing excellent wearability.
Hereinafter, the present disclosure will be described in more detail through the following examples. However, the following exemplary embodiments are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.
In addition, unless otherwise defined, all technical terms and scientific terms have the same meanings as those commonly understood by a person skilled in the art to which the present invention pertains. The terms used herein are only for effectively describing a certain exemplary embodiment, and not intended to limit the present invention. Further, unless otherwise stated, the unit of added materials herein may be wt %.
[Measurement of Rheological Properties of Yarn]
The rheological properties were measured using DHR-2 (TA Instrument), and a geometry used in the measurement was a storage modulus (G′), a loss modulus (G″), tan δ, a complex viscosity (η), and a phase angle (°) depending on an angular velocity change, measured with a plate-plate (parallel plate, PP). The measurement was performed at a temperature of 250° C. under a nitrogen atmosphere, and a sample dimension was measured at a diameter of 25 mm, a gap point of 1.0 mm, and a strain of 10%.
Graphs of results of measuring the rheological properties of Example 1 and Comparative Example 1 are shown in the following FIGS. 1 to 5 .
Specifically, FIG. 1 shows results of measuring the storage modulus (G′), FIG. 2 shows results of measuring the loss modulus (G″), FIG. 3 shows results of measuring tan δ, FIG. 4 shows results of measuring complex viscosity (η), and FIG. 5 shows results of measuring the phase angle (°) of Example 1 and Comparative Example 1.
[Measurement of Physical Properties of Protective Glove]
Cut Resistance
The cut resistance of the protective glove was measured according to the specification of ISO13997:1999.
Stiffness (gf)
A specimen (width: 60 mm, vertical: 60 mm) was taken from the palm of the protective glove, and the stiffness of the specimen was measured according to section 38 of ASTM D885/D885M-10a (2014). The measurement devices were as follows:

- (i) CRE-type Tensile Testing Machine (model: INSTRON 3343)
- (ii) Loading Cell, 2 KN [200 kgf]
- (iii) Specimen Holder: a specimen holder specified in section 38.4.3
- (iv) Specimen Depressor: a specimen depressor specified in section 38.4.4

Specifically, the specimen was placed on the center of the specimen holder so that the outer side of the glove of the specimen faced up and the inner side of the glove of the specimen faces down, and the side adjacent to glove fingers and the opposite side (that is, the side adjacent to a glove wrist) were directly supported by the specimen holder. The specimen was maintained in a flat stage without being bent. At this time, a distance between the specimen supporting part of the specimen holder and the depressing part of the specimen depressor was 5 mm. Subsequently, the specimen holder was raised up to 15 mm while the specimen depressor was allowed to stand motionless, thereby measuring a maximum tension.
Evaluation of Wear Resistance
The wear resistance of the protective glove was measured according to the specification of ASTM-D 3884. A Martindale wear resistance meter was used as the evaluation instrument. The friction cloth used at this time was 320 Cw sandpaper and an applied load was 500 g.

Example 1

A polyethylene multifilament interlaced yarn including 240 filaments and having a total fineness of 400 deniers was manufactured.
Specifically, polyethylene chips were added to an extruder and melted. The polyethylene melt was extruded through a spinneret having 240 nozzle holes. The filaments formed by being discharged from the nozzle holes of the spinneret were cooled in a cooling unit, and were sized into a multifilament yarn by a sizer. Subsequently, the multifilament yarn was drawn in a drawing unit and heat-set.
The drawing step was performed in a multistage drawing, and a relaxation ratio at the last drawing stage of the multistage drawing was 8%. Subsequently, the drawn multifilament yarn was interlaced with an air pressure of 6.0 kgf/cm²in an interlacing device, and then wound on a winder. A winding tension was 0.6 g/d.
The rheological properties of the manufactured yarn were measured and are shown in the following Table 1 and FIGS. 1 to 5 . In addition, the density, the weight average molecular weight, and PDI of the manufactured yarn were analyzed and are shown in the following Table 2.
Subsequently, a covered yarn was manufactured by surrounding the PE yarn of Examples 1 to 3 and Comparative Examples 1 to 3 spirally by a polyurethane yarn of 140 denier (Spandex) and a nylon yarn of 140 denier. The weight of the polyethylene yarn was 60% of the total weight of the covered yarn, and the weights of the polyurethane yarn and the nylon yarn were 20%, respectively, of the total weight of the covered yarn. The covered yarn was knitted to manufacture a protective glove.
The physical properties of the manufactured glove were measured, and are shown in the following Table 3.

TABLE 1

	Example	Example	Example	Comparative	Comparative	Comparative

Classification

	1	2	3	Example 1	Example 2	Example 3

G′ (Pa)	ω = 0.1	34.86	31.55	36.51	568.3	323.2	643.5
	(rad/s)
	Gradient	1.320	1.114	1.210	0.784	0.808	0.751
	(logG′)
	(logω = 0~1
	rad/s)
G″ (Pa)	ω = 0.1	389.1	368.5	401.3	1444	1035	1532
	(rad/s)
	Gradient	0.802	0.814	0.798	0.651	0.581	0.694
	(logG″)
	(logω = 0~1
	rad/s)
tanδ	ω = 0.1	11.17	9.90	10.81	2.5	1.9	5.9
	(rad/s)
η*	η* value	3906	4160	3819	15528	9863	18071
	(Pa · s)
	(ω = 0.1
	rad/s)
	Average	−637.3	−531.1	−788.0	−6861.35	−5152.53	−7153.2
	gradient
	(ω: 0.1~1
	rad/s)
Phase	Phase angle	85	81	76.5	69	61	72
Angle(º)	(º)
	(G* = 600 pa)

TABLE 2

	Example	Example	Example	Comparative	Comparative	Comparative

Classification

	1	2	3	Example 1	Example 2	Example 3

Physical	Density	0.964	0.962	0.961	0.961	0.962	0.960
properties	(g/cm³)
of PE	Mw	150,000	150,000	150,000	150,000	150,000	150,000
yarn	(g/mol)
	PDI	6.6	7.5	6.9	5.6	5.6	5.2
Number of fluff		11	15	16	32	27	23
occurrences
(EA/50,000 m)

Examples 2 and 3 and Comparative Examples 1 to 3

Protective gloves were manufactured in the same manner as in Example 1, except that the polyethylene yarns satisfying the physical properties of Tables 1 and 2 were used.

Wear resistance	2,100	2,230	2,150	1,600	1,420	1,100
Cut resistance	5.8	5.7	6.1	5.1	4.2	2.8
(N)
Stiffness (gf)	3.2	3.1	3.4	3.5	3.6	4.1

According to Table 3, it was confirmed that the protective gloves of the examples manufactured using the polyethylene fiber according to the present invention showed excellent wear resistance while having excellent cut resistance, and had low stiffness, and thus, had improved wearability as compared with the comparative examples.
Hereinabove, although the present invention has been described by specific matters, limited exemplary embodiments, and drawings, they have been provided only for assisting the entire understanding of the present invention, and the present invention is not limited to the exemplary embodiments, and various modifications and changes may be made by those skilled in the art to which the present invention pertains from the description.
Therefore, the spirit of the present invention should not be limited to the above-described exemplary embodiments, and the following claims as well as all modified equally or equivalently to the claims are intended to fall within the scope and spirit of the invention.

Comparative

Comparative

Comparative

Classification

1. A polyethylene yarn having the following properties:

in a graph of a storage modulus (G′) according to an angular frequency (ω), the storage modulus of 10 Pa to 100 Pa at the angular frequency of 0.1 rad/s, and the storage modulus of 100 Pa to 1000 Pa at the angular frequency is 1 rad/s, and

in a graph of tan δ according to the angular frequency (ω), tan δ of 9 or more at the angular frequency of 0.1 rad/s.

2. The polyethylene yarn of claim 1, wherein

the polyethylene yarn has, in a graph of a loss modulus (G″) according to an angular frequency (ω),

the loss modulus (G″) of 100 Pa to 700 Pa at the angular frequency of 0.1 rad/s, and shows a point at which the loss modulus is 1000 Pa in a section of the angular frequency of 0.25 to 0.5 rad/s.

3. The polyethylene yarn of claim 1, wherein

the polyethylene yarn has, in a graph of a complex viscosity (η*) according to an angular frequency (ω), the complex viscosity of 3000 Pa·s to 6000 Pa·s at the angular frequency of 0.1 rad/s, and an average gradient of −1000 to −300 in a section of the angular frequency of 0.1 rad/s to 1 rad/s.

4. The polyethylene yarn of claim 1, wherein

the polyethylene yarn has a fineness of 1 to 3 denier per filament (DPF).

5. The polyethylene yarn of claim 1, wherein

the polyethylene yarn has, in a graph of a phase angle according to a multiple shear modulus (G*), the phase angle of 75 to 90° at the multiple shear modulus (G*) of 350 to 1,000 Pa.

6. The polyethylene yarn of claim 1, wherein

the polyethylene yarn has the number of fluff occurrences of 20 EA/50,000 m or less.

7. A cut-resistant fabric comprising the cut-resistant polyethylene yarn of claim 1.

8. The cut-resistant fabric of claim 7, wherein

the fabric has a cut resistance of 5.5 N or more as measured according to a specification of ISO13997:1999.

9. A protective product comprising the cut-resistant fabric of claim 7.

10. The protective product of claim 9, wherein the protective product is a cut-resistant glove.