KR20220049900A - Multi-layer knit fabrics having improved electrostatic filter properties and uses thereof - Google Patents

Abstract

The present invention relates to a multi-layer knitted fabric and a use thereof, and more specifically, to a multi-layer knitted fabric with an improved electrostatic filter function and a use thereof. The multi-layer knitted fabric according to the present invention is provided to make a surface space which is wider than a rear space, thereby semi-permanently using the multi-layer knitted fabric by excluding a non-woven material. By minimizing inflow of pollutants and improving a water discharging performance, the present invention can maximize an electrostatic filter effect and an antibacterial effect due to use of copper conductive yarns. In addition, the multi-layer knitted fabric according to the present invention further improves the antibacterial effect by water-repellent coating the outer surface of a surface knitted fabric and suppressing water inflow. The present invention comprises: the surface knitted fabric; a rear knitted fabric; and connecting loops.

Description

Multilayer knitted fabric with improved electrostatic filter function and uses thereof

The present invention relates to a multi-layer knitted fabric and uses thereof, and more particularly, to a multi-layer knitted fabric having an improved electrostatic filter function and uses thereof.

Recently, as the problem caused by the corona virus as well as fine dust has emerged as a global solution, the importance of the mask is being emphasized above all else.

In general, performance certification masks such as KF80, KF94, and KF99 employ a non-woven fabric filter material, but there is a problem in that it is difficult to reuse due to deterioration of filter performance during cleaning or washing.

On the other hand, as a mask in the form of a knitted fabric, a seamless cotton mask manufactured by a seamless circular knitting machine has been proposed. The knitted fabric mask has the advantage of being reusable, unlike the non-woven fabric mask, but has a problem of low dust collection performance as well as viruses and bacteria.

A three-layer knitted knitted knitted fabric is disclosed by using a double-sided circular knitting machine to bind a surface knitted fabric and a back surface knitted fabric with a vertical loop. Patent Document 1 discloses a wet and quick-drying multi-layer knitted fabric knitted with a double circular knitting machine, having a three-layer structure consisting of a hydrophobic surface tissue layer, a hydrophobic back tissue layer, and hydrophilic loops binding them, and Patent Document 2 is an antibacterial mask As a material that can be applied, the upper knitted fabric; a lower knitted fabric comprising an electrically conductive fiber comprising a copper component and a non-conductive fiber comprising a copper component; And a multi-layer knitted fabric comprising a vertical knitted fabric comprising monofilament yarn fibers has been disclosed.

However, in order to certify the performance of the KF94 level when applied as a mask fabric, reinforcement of filter performance is continuously required.

Patent Document 1: Korean Patent Publication No. 10-2002-0060878 Patent Document 2: Korean Patent Publication No. 10-2000730

In order to solve the problems of the prior art, the present inventors, while researching on the fabric for a mask, in a multi-layer knitted fabric including a surface knitted fabric, a back knitted fabric and a connecting loop, the filter performance is more improved when applied as a fabric for a mask By confirming, the present invention was completed.

The present invention is to provide a multilayer knitted fabric with improved filter performance when applied as a fabric for a mask in a multilayer knitted fabric including a surface knitted fabric, a back knitted fabric and a connecting loop, and a filter and a mask for a mask using the same.

The present invention, in order to solve the above-mentioned problems,

surface knitted fabric; back knitted fabric; and a connection loop for binding the surface knitted fabric and the back surface knitted fabric to each other; as a multilayer knitted fabric, the connection loop is formed such that the surface knitted fabric and the back knitted fabric are spaced apart from each other by 0.5 mm to 3 mm, and includes a copper conductor, , The vertical cross-sectional shape of the multi-layer knitted fabric provides a multi-layer knitted fabric in a form parallel to the outer radius and inner radius.

In addition, the present invention, the vertical cross-sectional shape of the multi-layer knitted fabric provides a multi-layer knitted fabric, characterized in that the cross-section of the surface knitted fabric is an outer radius, the back surface knitted fabric cross-section is an inner radius.

In addition, the present invention provides a multilayer knitted fabric, characterized in that the loop length (loop length) of the surface knitted fabric is greater than the knitted loop length of the back surface knitted fabric.

In addition, the present invention, the multi-layer knitted fabric is circular knitted with a double-sided circular knitting machine of 20 to 50 gauge, the knit ring length of the surface knitted fabric is 12.1mm to 13mm, the knitted ring length of the back knitted fabric is circular knitted from 11mm to 12mm A multi-layer knitted fabric is provided.

In addition, the present invention, the surface knitted fabric provides a multi-layer knitted fabric, characterized in that the outer surface is water-repellent coating.

In addition, the present invention provides a multi-layer knitted fabric, characterized in that the yarn constituting the multi-layer knitted fabric is an antibacterial dyed yarn.

The present invention also, in order to solve the other problems,

It is a filter for a mask comprising the multi-layer knitted fabric, and provides a filter for a mask in which the surface knitted fabric is used in the outer skin direction and the back surface knitted fabric is used in the inner skin direction.

The present invention also, in order to solve the other problems,

It is a mask comprising the multi-layer knitted fabric, and provides a mask in which the surface knitted fabric is used as an outer skin and the back surface knitted fabric is used as an inner skin.

In the case of the multi-layer knitted fabric according to the present invention, by making the surface space wider than the back space, it is possible to use semi-permanently by excluding non-woven materials, while minimizing the inflow of pollutants and improving the water discharge performance, so that the electrostatic filter caused by the use of copper transfer transfer Effectiveness and antibacterial effect can be maximized. In addition, in the case of the multi-layer knitted fabric according to the present invention, the water-repellent coating treatment on the outer surface of the surface knitted fabric suppresses moisture inflow, thereby further improving the antibacterial effect.

1 is a view schematically showing a vertical cross-section of a multi-layer knitted fabric according to the present invention.
2 is a view conceptually explaining the spatial distribution of the multi-layer knitted fabric according to the present invention.
3 is a photograph showing a cross-section of a multi-layer knitted fabric prepared according to Example 1 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, exaggerated for convenience of understanding, and similar reference numerals are given to similar parts throughout the specification, and the details shown in the multi-layer knitted fabric The direction of the configuration will be described with reference to the drawings. Also, throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

1 is a view schematically showing a vertical cross-section of a multi-layer knitted fabric according to the present invention.

As used herein, the term 'knitting' means weaving a fabric in a circular knitting machine, and the knitted fabric or knitted fabric means a fabric that can be restored to its original state after stretching by, for example, 10 to 30% or more after being woven in a knitted form.

In the present invention, the type of fibers used in the surface knitted fabric 110, the back knitted fabric 120, and the connecting loop 130 constituting the multi-layer knitted fabric 100 may be selected according to the environment in which the fabric is used, for example, poly It may be an ester, polyamide, polyurethane, spandex or blended yarn thereof. According to an embodiment of the present invention, the fibers constituting the multi-layer knitted fabric 100 are a blend of 70 wt% to 90 wt% polyester, 5 wt% to 15 wt% polyamide, and 5 wt% to 15 wt% polyurethane It may be a yarn or a general yarn having a thickness of 30D to 50D as a blended yarn of 70 wt% to 90 wt% of polyester, and 10 wt% to 30 wt% of spandex.

In the present invention, the connection loop 130 includes a copper conductive yarn, is used to provide conductivity and antibacterial properties at the same time by a copper component, and is made of copper in the fiber core so that it can be stretched with other knitted fibers. It may be a fiber in the form containing the component. The type of fiber that becomes the fiber core is as described above, and according to an embodiment of the present invention, the copper conductive transfer yarn is a blended yarn of the same composition as the general yarn, but a copper coating solution (levulinic acid, sodium Copper sulfide (CuS) 10 weight in a compound consisting of sodium lauryl sulfate, polyethylene glycol, sodium thiosulfate, sodium hypophosphlte and ethylenediaminetetraacetic acid (EDTA) % to 20% by weight of complex formation) may be a copper conductive transfer having a thickness of 31D to 52D using a polyamide containing 5% to 20% by weight. The copper-conductive transfer agent prepared according to a method known in the art may be used, for example, a copper-conductive transfer prepared using the compound disclosed in Korean Patent No. 1074692 may be used.

As used herein, the term 'copper conductive yarn' refers to a fiber yarn having conductivity including a copper component.

The connection loop 130 may include general fibers, that is, ordinary fibers not coated with a copper component, in addition to the copper conductive yarn, and the surface knitted fabric 110 and the back knitted fabric 120 together with the copper conductive yarn. It is possible to prevent tissue deformation during compression of the multi-layer knitted fabric 100 by binding to the rigidity.

In the present invention, the multi-layer knitted fabric 100 has a surface knitted fabric 110 and a back knitted fabric 120 that are spaced apart from each other by a connecting loop 130, for example, may be spaced apart from 0.5 mm to 3 mm. Between the surface knitted fabric 110 and the back knitted fabric 120, post-processing, for example, means a state that has undergone a process such as scouring, and the separation distance is increased to a level of about 50% or more in the dough state before scouring.

In the present invention, the multi-layer knitted fabric 100 may be knitted using a conventional double-sided circular knitting machine. The double-sided circular knitting machine and knitting conditions may be appropriately selected according to the type of fibers used in the front knitted fabric 110 and the back knitted fabric 120 and the connecting loop 130, for example, a knitting loop length of 10 mm to 15 mm. length), 60 to 120 feeders, and 20 to 50 gauge conditions can be used. The multi-layer knitted fabric 100 in the form of dough knitted by the double-sided circular knitting machine may be manufactured in the form of a final multi-layer knitted fabric through a subsequent refining process, and the refining process may be performed by a method known in the art, for example, Korean Patent Registration The methods disclosed in Nos. 1925070, 1925063, and 1866418 can be used.

In the present invention, the multi-layer knitted fabric 100 is characterized in that the vertical cross-sectional shape is a curved shape in which the cross-section of the surface knitted fabric 110 is an outer radius and the cross-section of the back knitted fabric 120 is an inner radius. That is, the fabric width of the back knitted fabric 120 is narrower than the fabric width of the front knitted fabric 110, and the vertical cross-sectional shape of the knitted fabric after knitting with a double-sided circular knitting machine is a curved shape in which the radius is smaller in the back knitted fabric 120 direction.

As shown in FIG. 2 due to the unbalanced vertical cross-sectional shape of this multi-layer knitted fabric 100, the space of the surface knitted fabric 110 is relatively wider than the space of the back knitted fabric 120, the surface knitted fabric 110 ) Even if the pollution source (P) penetrates from the outside, the movement path to the back knitting fabric 120 is narrowed, so it is difficult to reach the back knitted fabric 120 through the connection loop 130 including the copper conductive transfer having an electrostatic filter function.

Although not particularly limited in the present invention as a method for implementing the vertical cross-section of the multi-layer knitted fabric 100 to have a curved shape, it may be preferably implemented through adjustment of a knitting loop length (loop length). That is, the weight of the yarn changes according to the length of the knitting ring. Specifically, as the length of the knitting loop is longer, the weight per unit area (g/m2) is lowered, so that the fabric is loose and the width of the fabric is wide. The weight (g / m 2) is increased to make the fabric dense and the fabric width is narrow. In the present invention, the knitted ring length of the surface knitted fabric 110 is greater than the knitted ring length of the back knitted fabric 120 The vertical cross section of the multilayer knitted fabric 100 It can be implemented so that it becomes this curved shape.

At this time, in terms of maximizing the electrostatic filter effect and antibacterial effect by copper transfer, the multilayer knitted fabric 100 is circular knitted with a double-sided circular knitting machine of 25 to 30 gauge, the knitting length of the surface knitted fabric 110 is 12.1 mm to 13 mm , It is preferable that the circular knitting length of the back knitted fabric 120 is 11 mm to 12 mm.

According to an embodiment of the present invention, the surface knitted fabric 110 may be a water-repellent coating on the outer surface. The outer surface of the surface knitted fabric 110 is water-repellent coated, thereby suppressing the inflow of moisture, thereby further improving the antibacterial effect. It is also possible to block droplets having a diameter of about 4 μm or more.

The composition of the water-repellent coating liquid used for the water-repellent coating is not particularly limited, and a coating liquid used for water-repellent treatment of conventional textile materials may be used, for example, a fluorine-based or non-fluorine-based water-repellent coating liquid may be used. In addition, the water-repellent coating on the outer surface of the surface knitted fabric 110 may be performed using a known knife method or a rotary method.

According to an embodiment of the present invention, the yarn constituting the multi-layer knitted fabric 100 may be an antibacterial dyed yarn. That is, the surface knitted fabric 110 , the back knitted fabric 120 , and the copper conductive yarn may all be antibacterially treated original yarns, thereby further improving the antibacterial effect of the multilayer knitted fabric 100 .

The method of manufacturing the antibacterial dyed yarn is not particularly limited, and a known method, for example, a yarn prepared by mixing and spinning an antibacterial agent in a spinning process using a yarn manufacturing chip may be used.

The above multilayer knitted fabric 100 is not limited in its use if it is applied to filter contamination sources such as fine dust, viruses, and bacteria, but may be preferably applied for a filter or a mask for a mask.

When applied as a filter for the mask, as a filter for a mask including a multi-layer knitted fabric 100 , the surface knitted fabric 110 is used in the outer skin direction and the back knitted fabric 120 is used in the inner skin direction. In addition, when applied as the mask, as a mask including a multi-layer knitted fabric 100, the surface knitted fabric 110 is used as the outer skin and the back surface knitted fabric 120 is used as the inner skin.

Hereinafter, the present invention will be described in more detail by way of Examples. The yarn specifications used in the following Examples and Comparative Examples are as follows.

[Yarn Specification]

- Normal yarn: A general yarn having a thickness of 40D with a blend of 80% by weight of polyester, 10% by weight of polyamide (PA6) and 10% by weight of polyurethane.

- Copper conduction transfer: same composition as above, but with copper coating solution (levulinic acid, sodium lauryl sulfate, polyethylene glycol, sodium thiosulfate, Thickness 41D using polyamide (PA6) containing 10% by weight of copper sulfide (CuS) in 10 to 20% by weight of copper sulfide (CuS) in a compound consisting of sodium hypophosphlte and ethylenediaminetetraacetic acid (EDTA) 42D's Copper Warrior.

Example 1

In a double circular knitting machine (28 gauge), the above normal yarns were fed respectively for the front knitted fabric and the back knitted fabric, but the knitted loop length of the surface knitted fabric was 12.5 mm and the knitted loop length of the back knitted fabric was 12 mm. As the copper conductive yarn and the general yarn were fed at a ratio of 1:8, the surface knitted fabric cross section formed an outer radius and the back surface knitted fabric cross section formed a curved multilayer knitted fabric with an inner radius. A non-fluorine-based water-repellent coating solution (hydrocolloid 5% to 15% by weight, pyrometric acid 3% to 6% by weight, trimethylbenzylammonium bromide 3% to 6% by weight, 5 wt% to 10 wt% of hydroxyproline, 5 wt% to 10 wt% of dichlorodimethylsilane, 3 wt% to 6 wt% of nonylphenol ethoxylate, the balance of acrylic resin) using a knife method coating treatment and The final multi-layer knitted fabric was prepared by drying. A cross-section of the prepared multi-layer knitted fabric is shown in FIG. 3 .

Example 2

A multi-layer knitted fabric was prepared in the same manner as in Example 1, except that the water-repellent coating was not applied to the outer surface of the surface knitted fabric in Example 1.

comparative example

A multi-layer knitted fabric was prepared in the same manner as in Example 1, except that the knitted ring length of the surface knitted fabric and the back knitted fabric in Example 1 was adjusted to be the same as 12 mm.

Test Example 1

NaCl aerosol test (test equipment: Filter tester SPF 1300S) was performed to evaluate the electrostatic filter performance of the prepared multi-layer knitted fabric. NaCl aerosol test method 　 1% by volume of sodium chloride (NaCl) solution is pressurized and heated, dispersed in the air in the form of an aerosol having a concentration of 8±4 mg/m3 and a particle size of 0.6 μm, and then applied to the filter to be tested. As a method of measuring the amount of sodium chloride remaining in the air after passing by passing it for 30 seconds at a flow speed of 95 L/min in the direction of the back knitted fabric from the surface knitted fabric, the filtration rate is evaluated by performing the above method (repeat three times, measure the average value) and the results are shown in Table 1 below.

division Filtration rate (%) Example 1 75.0 Example 2 71.2 comparative example 41.3

Referring to Table 1, in the multi-layer knitted fabric including the surface knitted fabric, the back-side knitted fabric and the connecting loop according to the present invention, the copper conductive yarn is used as the connecting loop, and the vertical cross section of the multi-layer knitted fabric is curved so that the surface space is the back surface By making it wider than the space (Examples 1 and 2), it can be seen that the electrostatic filter effect is dramatically improved, and the electrostatic filter effect is maximized by water-repellent coating the outer surface of the surface knitted fabric (Example 1).

Test Example 2

For the evaluation of the antibacterial performance of the multilayer knitted fabric prepared according to Example 1, based on KS K 0693:2016, which is an antibacterial test method of the fabric, the bacteriostatic reduction rate was measured under the following conditions, and the results are shown in Table 2 below.

[Conditions for measuring antibacterial levels]

- Standard fabric: Cotton

- Nonionic surfactant: TWEEN 80, 0.05% by weight added to the inoculation liquid

- Test bacteria: Staphylococcus aureus (ATCC 6538) (strain 1) and klebsiella pneumoniae (ATCC 4352) (strain 2)

- < : less than

- Washing conditions: KS K ISO 6330: 2011, 88, washing temperature 40±3℃ Horizontal mesh drying

division BLANK Surface (after 30 washes) The back side (after washing 30 times) strain 1 Number of bacteria immediately after inoculation (number of bacteria/ml) 2.2Х10 ⁴ 2.2Х10 ⁴ 2.2Х10 ⁴ after 18 hours 9.8Х10 ⁶ < 10 < 10 Bacteriostatic reduction rate (%) - 99.9 99.9 strain 2 Number of bacteria immediately after inoculation (number of bacteria/ml) 2.0Х10 ⁴ 2.0Х10 ⁴ 2.0Х10 ⁴ after 18 hours 3.8Х10 ⁷ < 10 < 10 Bacteriostatic reduction rate (%) - 99.9 99.9

Referring to Table 2, in the multi-layer knitted fabric including the surface knitted fabric, the back-side knitted fabric and the connecting loop according to the present invention, a copper conductive yarn is used as a connecting loop, and the vertical cross section of the multi-layer knitted fabric is curved so that the surface space is the back surface It is confirmed that very excellent antibacterial performance can be realized by making the space wider than the space and coating the outer surface of the surface knitted fabric with water repellency.

The above description of the present application is for illustration, and those of ordinary skill in the art to which the present application pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present application is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present application.

100: multi-layer knitted fabric
110: surface knitted fabric
120: back knitted fabric
130: connecting loop

Claims (8)

surface knitted fabric;
back knitted fabric; and
As a multi-layer knitted fabric comprising a; a connection loop for binding the surface knitted fabric and the back knitted fabric,
The connection loop is formed so as to have a separation distance of 0.5 mm to 3 mm between the surface knitted fabric and the back surface knitted fabric, and includes a copper conductor,
The vertical cross-sectional shape of the multi-layer knitted fabric is a multi-layer knitted fabric in a form parallel to the outer radius and inner radius.
According to claim 1,
The vertical cross-sectional shape of the multi-layer knitted fabric is a multi-layer knitted fabric, characterized in that the surface knitted fabric cross-section is an outer radius, and the back knitted fabric cross-section is an inner radius.
The method of claim 1,
A multilayer knitted fabric, characterized in that the loop length of the front knitted fabric is greater than the loop length of the back knitted fabric.
The method of claim 1,
The multi-layer knitted fabric is a circular knitted fabric with a double-sided circular knitting machine of 20 to 50 gauge, the surface knitted fabric has a knit ring length of 12.1 mm to 13 mm, and the back knitted fabric has a circular knitted ring length of 11 mm to 12 mm.
According to claim 1,
The surface knitted fabric is a multilayer knitted fabric, characterized in that the outer surface is water-repellent coating.
According to claim 1,
The yarn constituting the multi-layer knitted fabric is a multi-layer knitted fabric, characterized in that the antibacterial dye yarn.
A mask filter comprising the multi-layer knitted fabric of any one of claims 1 to 6, wherein the surface knitted fabric is used in the outer skin direction and the back knitted fabric is used in the inner skin direction.
A mask comprising the multilayer knitted fabric of any one of claims 1 to 6, wherein the surface knitted fabric is an outer skin and the back knitted fabric is an inner skin.

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