KR20190041122A - Multi-layer composite fibrous filter and manufacturing method thereof - Google Patents

Abstract

The present invention relates to: a multilayered composite fiber filter which completely blocks secondary pollution caused by the dust of activated carbon by not using activated carbon at all generally used in a filter for removing harmful gas and exhaust gas introduced into a vehicle; and a manufacturing method thereof. The chemical-impregnated fiber provided by the present invention: does not generate dust while having excellent mechanical strength, elasticity, and wear resistance as a course yarn in a bulky shape and a composite fiber made like a yarn; provides a chemical fiber deodorizing filter which is soft and has excellent heat insulation and bending ability; has excellent deodorization and odor removal effects against various kinds of odor generating substances; and can be effectively used as a material to remove harmful gas which may be generated in a house, a source of motion, and an industrial site such as an automobile combination filter, an air conditioning filter, food waste, a shoe shelf, a toilet, and an air purifier. The multilayered composite fiber filter is formed by laminating: a porous support impregnated with at least one basic metal compound; a porous support impregnated with at least one organic acidic catalyst material; and a porous support having at least one metal oxide material impregnated thereon.

Description

TECHNICAL FIELD The present invention relates to a multi-layer composite fiber filter and a manufacturing method thereof,

The present invention relates to a harmful substance blocking filter. In particular, since no activated carbon commonly used in a filter for removing harmful gas and exhaust gas flowing into an automobile or a room is used at all, the second pollution caused by dust of the activated carbon is completely blocked To a multilayer composite fiber filter and a manufacturing method thereof.

In general, a small amount and a large amount of noxious gas including various living odors and odors are generated from sources such as automobile exhaust gas, indoor VOC, and people.

Examples of gases causing odor and noxious gas include methyl sulfide, methyl disulfide, hydrogen sulfide, nitrogen oxide, nitrogen dioxide, sulfur dioxide, xylene, styrene, etc. in addition to the main odor causing factors such as ammonia, acetic acid, aldehydes, fatty acids, amines and volatile organic compounds .

Generally, activated carbon, natural zeolite, natural minerals, photocatalyst, charcoal, ion exchange resin, synthetic silica, etc., which are manufactured from raw materials such as palm, coal, pitch and cellulose fibers are mainly used for removing odor gas. Many technologies are being reported.

However, the materials used in the prior arts have a relatively large specific surface area, large and medium pores are well developed, and some odor gas is adsorbed to some degree. However, when a certain amount of odor generating material is adsorbed, There is no selective gas removal capability.

Particularly, activated carbon generates fine dust due to vibration or fluid flow, and a phenomenon that particulate matter is gradually released to the outside occurs, resulting in secondary contamination.

In order to improve this, a chemical medicinal material is impregnated or coated on an organic or inorganic porous material such as activated carbon or zeolite to selectively remove harmful gas and odorous gas through physical adsorption and chemical adsorption. In particular, ammonia, hydrogen cyanide, and carbon monoxide, which are lighter in molecular weight than air, are difficult to block by only activated carbon, thereby improving performance by impregnating metallic and other chemicals with activated carbon.

In the case of such impregnated activated carbon, most of the pellets and crushed (4 * 8 mesh, 20 * 40 mesh, 30 * 60 mesh) having a predetermined particle size, for example, In the case of a product sensitive to human respiration such as a purifier and a vehicle combination filter, there is a disadvantage that fine dust is generated and differential pressure of the filter is generated when the filter is operated for a long time.

For example, Korean Patent Registration No. 10-0905004 discloses a deodorant prepared by using activated carbon containing at least one kind of iron oxide, chromium, nickel, cobalt, manganese, copper, Lt; / RTI > In addition, U.S. Patent No. 6319440 discloses a method for producing a deodorant in which a copper or manganese metal catalyst is impregnated with granular or fibrous activated carbon followed by acid treatment. However, the deodorant of such a formulation is weak in strength and has a poor ability to remove harmful gas and odor.

The chemical impregnated filter has a very long service life which can absorb and remove harmful gas and odor gas which can be exposed for a long time. For this purpose, a method of attaching an adsorbent such as activated carbon is applied to the nonwoven fabric, It is applied to air cleaner, industrial air conditioning filter, and automobile air-conditioner filter, but since it takes into consideration the generation of fine dust and high differential pressure of adsorbed material, development of various chemical adsorption filter .

In addition, various deodorizing materials employing impregnated activated carbon, impregnated zeolite, charcoal, photocatalyst, titanium dioxide, alumina, silica and the like which are used as conventional deodorizing materials have been developed. However, the effect of deodorant can not be maintained for a long time, The deodorizing force of the air cleaner and the activated carbon filter for a vehicle into which the air of the air inlet is introduced is not quick and the type of gas to be removed is limited.

KR 10-1576270 B1 (Dec. 23, 2015) KR 10-1500464 B1 (March 31, 2013). KR 10-0885457 B1 (2009.02.18.) KR 10-1464206 B1 (2014.11.17.) KR 10-0905004 B1 (June 22, 2009) US 6,319,440 B1 (Nov. 20, 2001)

Accordingly, the present inventor has intensively solved the limitations and problems of the conventional automotive filter in consideration of the above-mentioned matters, so that the deodorizing power against various types of odor and odor causing substances and harmful gas is very fast and excellent As a result, the inventors of the present invention have invented the present invention as a result of intensive efforts to develop a filter for a vehicle having a bulky chemical filter capable of various formulations as a filter.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a chemically adsorbent material which can be effectively used for removing harmful and odorous gases such as a combination filter for vehicles, an air cleaner, a food processor, a refrigerator, an air cleaner, Or a deodorizing fiber material and a method of manufacturing the same.

Another technical problem and object of the present invention is to provide a method of manufacturing a filter medium having a low pressure loss and a method of chemically adsorbing the filter media in a variety of formulations, even in a space-constrained air conditioner, Layer composite fiber filter using the same, and a manufacturing method thereof.

According to an aspect of the present invention, there is provided a multilayered composite fiber filter comprising: a porous support impregnated with at least one basic metal compound selected from KOH, NaOH, KI, KIO ₃ , LiOH, NaCO ₃ and NaI; A porous support impregnated with at least one organic acid-based catalyst material selected from hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, citric acid, sodium hypochlorite, hydrogen peroxide and salicylic acid; And a porous support impregnated with at least one metal oxide material selected from potassium permanganate, sodium permanganate, potassium bichromate and sodium bichromate.

At this time, it is preferable that the multi-layered composite fiber filter according to the present invention further comprises a supporter for removing ultrafine dust.

Further, the multi-layered composite fiber filter according to the present invention is characterized in that the basic metal compound, the organic acid catalyst material and the metal oxide material are impregnated in a ratio of 1-20 wt% with respect to 80-99 wt% of each porous support .

In order to accomplish the above object, the present invention provides a method of manufacturing a multilayered composite fiber filter, which comprises mixing 30 to 60% by weight of low melting point fibers (LM) with 40 to 70% by weight of PET fibers, 30 to 60% by weight of low melting point fibers (LM) and 40 to 70% by weight of PP fibers are mixed to form a second composite nonwoven fabric, 30 to 60% by weight of low melting point fibers, 20 to 40% By weight of the first composite nonwoven fabric; A step of attaching a chemical substance to the first, second and third composite nonwoven fabrics, respectively; Bonding the first, second, and third composite nonwoven fabrics to which the chemical substance is impregnated, with one of heat fusion and hot melt; And combining the electrostatic fibers for removing ultrafine dust with the composite material of the first, second and third composite nonwoven fabrics.

In order to achieve the above object, the present invention also provides a method for producing a composite nonwoven fabric comprising thermoplastic fibers having a high melting point resin as a core component and a low melting point resin as a cutting component Preparing a first, a second, and a third nonwoven fabric with different monofilament fineness within a range of 1-18 denier per single filament; Attaching a chemical substance to each of the first, second, and third nonwoven fabrics; Bonding the first, second, and third nonwoven fabrics to which the chemical substance is impregnated to one of a hot melt process and a hot melt process; And laminating the electrostatic fibers for removing ultrafine dust to the laminate of the first, second and third nonwoven fabrics.

At this time, in the method for producing a multilayered composite fiber filter according to the present invention, the chemical substance is at least one basic metal compound selected from KOH, NaOH, KI, KIO ₃ , LiOH, NaCO ₃ and NaI, At least one organic acid catalyst material selected from the group consisting of nitric acid, phosphoric acid, citric acid, sodium hypochlorite, hydrogen peroxide and salicylic acid, and at least one oxidizing metal substance selected from potassium permanganate, sodium permanganate, potassium bichromate and sodium bichromate .

As described above, the present invention has excellent ability to remove bad odors and noxious gases, and can be provided in various forms such as a bent shape, a sheet shape, a mini plate shape, a filling shape, and the like, Low pressure loss and filter media can be manufactured in various formulations even in a place where an air conditioner and a fast flow rate are inevitably caused, and there is an excellent effect on the removal of air and odor gas.

In addition, the present invention can be effectively used for removing harmful gas and odor gas such as air cleaner, food processor, refrigerator, air purifier, air conditioner, air conditioner filter, etc. Also, in a combination filter for vehicles having high temperature and excessive moisture And excellent deodorization performance can be stably provided for a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a manufacturing process of a multi-layer composite nonwoven fabric for a filter according to the present invention,
2 is a view schematically showing a chemical treatment process of the filter multi-layer composite nonwoven fabric of FIG. 1,
3 is a schematic view illustrating a method of manufacturing a multilayer composite fiber filter according to the present invention,
4 is a comparative graph showing the toluene removal efficiency of the multi-layered composite fiber filter and the commercial filter according to the present invention,
5 is a comparative graph showing the sulfur dioxide removal efficiency of the multi-layered composite fiber filter and the commercial filter according to the present invention,
6 is a comparative graph showing the hydrogen sulfide removal efficiency of a multilayer composite fiber filter and a commercial filter according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a multilayered composite fiber filter and a method of manufacturing the same according to the present invention will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The same features of the Figures represent the same reference symbols wherever possible. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the attached drawings are exaggerated or simplified in order to facilitate understanding and clarification of the structure and operation of the technology, and it is to be understood that each component does not exactly coincide with the actual size.

In the present invention, '1 denia' refers to the diameter when 1 g of fiber is increased by 1,000 m.

In the present invention, 'media' is a sheet in which a chemical substance such as a basic metal compound, an organic acid catalyst material, and a metal oxide material is stuck to a composite nonwoven fabric, Quot; sheet "

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It is to be understood that the same terms as those defined in the commonly used terms are defined in consideration of the functions of the present invention and are to be construed in accordance with the technical idea of the present invention and the meaning commonly understood or commonly recognized in the technical field And is not to be construed as an ideal or overly formal sense unless expressly defined to the contrary.

Hereinafter, the multilayered composite fiber filter according to the present invention and its manufacturing method will be described in detail with reference to the drawings.

FIG. 1 is a view briefly showing a manufacturing process of a multi-layer composite nonwoven fabric for a filter according to the present invention. First, the card machine 110 of FIG. 1 performs thin and wide spreading of short fibers as a raw material to be supplied in a rolled state.

The short fibers supplied to the card machine 110 may be thermoplastic fibers having a high melting point resin having a melting point of 150-180 DEG C as a core component and a low melting point resin having a melting point of 100-150 DEG C as a superfine have. At this time, it is preferable that the thermoplastic fibers increase the air permeability by mixing fibers having diameters different from each other within a range of 1-18 denier per single filament.

For example, a single yarn finely mixed with 30 to 60 wt% of single strand of 1-5 denier, 20 to 40 wt% of single strand fineness of 6-11 denier and 20 to 40 wt% of single strand fineness of 12-18 denier . On the other hand, in order to impregnate the basic metal compound, the organic acid catalyst material and the metal oxide material separately in the chemical material impregnation step, which will be described later, the first nonwoven fabric is made of monofilament monofilament having a fiber length of 1-5 denier, The monofilament fineness is also made of short fibers of 6-11 denier, and the third nonwoven fabric can be made of only monofilament fineness fibers of 12-18 denier.

Poly (ethylene terephthalate), PP (polypropylene), and low melting (LM) fibers may be mixed and supplied to the card 110. At this time, it is preferable that PET, PP, and low melting point fibers have diameters different from each other with a single fiber fineness of 1-18 denier. For example, a single yarn fineness is obtained by mixing 30 to 60% by weight of low melting point fibers of 1-5 denier, 20 to 40% by weight of PET of 6-11 denier per filament and 20 to 40% by weight of PP of 12-18 denier per filament fineness Can be manufactured.

At this time, the first composite nonwoven fabric is mixed with 30-60 wt% of the low melting point fibers and 40-70 wt% of the PET fibers, and 30-60 wt% of the low melting point fibers are mixed with 40-70 wt% of the PP fibers, And 20 to 40% by weight of the PET fiber and 20 to 40% by weight of the PP fiber to 30 to 60% by weight of the low melting point fibers, respectively, to prepare the third composite nonwoven fabric.

The web formed by the card machine 110 may be about 15-20 grams per square meter. A plurality of folds (for example, four folds) are stacked by a required weight in the molding machine 120, for a fabric web formed on the card machine 110. The plurality of webs stacked in the molding machine 120 are joined to each other at the jammer 140 by crossing and jamming the fibers by needle punching. The miter unit 140 combines multiple layers of webs into a single fabric by a needle punching technique.

Then, the heat calender 150 generates heat by applying heat through the rollers while pressing and moving the fabric joined between the two rollers or the belt at an appropriate speed by needle punching (thermal rendering, Heat calendaring). The produced fabric (first nonwoven fabric) is rolled and stored in a rewinder (rewinder) 160 provided at the other end of the nonwoven fabric manufacturing process. The hot rendering temperature may be 90-200 占 폚.

In this case, when a multi-layer composite nonwoven fabric for a gas filter according to the present invention is produced by laminating one fabric (second nonwoven fabric) to the fabric (first nonwoven fabric) prepared as described above, A second nonwoven fabric which is rolled in a roll form on an unwinder 130 provided at one end of the nonwoven fabric fabrication line is wound around the laminated web passing through the card machine 110 and the molding machine 120, Punched and hot drawn by the thermal calender 150 and finally stored in a roll form on the rewinder 160.

Hot calender rendering by the thermal calender 150 is possible due to the characteristics of the short fibers which are the raw materials mentioned above. The raw staple fiber is a fiber whose core is a high melting point fiber (150-180 ° C) and whose outer circumferential surface is coated with a low melting point fiber (100-150 ° C). When heated to 100-150 ° C, only a low melting point fiber By this heat, a nonwoven fabric having a required thickness is formed.

FIG. 2 is a schematic view of a chemical treatment process for filtering noxious gas of a filter multi-layer composite nonwoven fabric according to the present invention. According to the chemical treatment process of FIG. 2, the multi- The material is impregnated and coated with a chemical substance that blocks harmful gases.

Referring to FIG. 2, the multi-layer composite nonwoven fabric manufactured in FIG. 1 is mounted on the unwinder 210 in the form of a roll, and then a chemical material solution is applied to coat the chemical material, The impregnation process is performed in the impregnator 230. As the outer surface of the short fibers forming the multi-layer composite nonwoven fabric is coated with the chemical substance through the impregnation process, the filter multi-layer composite nonwoven fabric according to the present invention has chemical porosity comparable to the physical porosity of the activated carbon.

KOH, NaOH, KI, KIO3, LiOH, NaCO3 or NaI may be used as the basic metal compound to be impregnated on the outer surface of the fibers constituting the composite nonwoven fabric.

As the organic acid-based catalyst material, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, citric acid, sodium hypochlorite, hydrogen peroxide or salicylic acid may be used, and metal oxide materials impregnated on the surface and inside of the chemisorbent or deodorant may be potassium permanganate, Sodium permanganate, potassium dichromate, and sodium bichromate may be used alone or in combination.

The impregnation ratio of the basic metal oxide and the organic acid based catalyst material impregnated in the filter multi-layer composite nonwoven fabric according to the present invention is preferably 1-20 wt% with respect to the impregnated porous nonwoven fabric, It is preferably 1-20% by weight based on the nonwoven fabric. After the impregnation process, the multi-layer composite nonwoven fabric is pressurized by removing the chemical material from the thermally calender 250 while leaving a proper amount of the chemical material in the presser 240. At the same time, the multilayer composite nonwoven fabric is pressurized by heat so as to have a desired thickness, (260).

Since the harmful gas to be removed by the multi-layered composite fiber filter according to the present invention includes acidic and alkaline materials, in order to remove all of the noxious gases having various properties, for example, firstly, an acidic chemical substance is treated A first medium for the filter is prepared, dried and stored in the form of a roll, and a second medium for a filter treated with a second basic chemical substance is prepared and stored in a roll form. In addition, a third medium for a filter treated with a chemical substance for removing other harmful gas may be prepared and stored in a roll form.

As described above, since the existing activated carbon filter laminates the harmful substances adsorbed by the physical adsorption method on the porous layer of the activated carbon, if the adsorbable amount is saturated, the harmful substances accumulated in the filter can be leaked to the outside of the filter, The multi-layered composite fiber filter according to the present invention neutralizes and removes harmful substances in the air by a chemical adsorption method, so that harmful substances are not accumulated in the filter unlike the activated carbon filter, so that the filter performance of high quality can be provided for a long time.

FIG. 3 is a view briefly showing a method for producing a multilayer composite fiber filter according to the present invention, wherein the first to third media for filters manufactured in FIG. 2 are laminated to finally produce a multilayer composite fiber filter according to the present invention.

Referring to FIG. 3, after the first media for filter is mounted on the unwinder 310 in a roll form, the adhesive of the synthetic resin copolymer is melted in the melter 320 to about 2-5 g, and is sprayed and applied onto the surface of the first medium.

In the hot-melt bonding method, polyolefin (Poly-Olefin) is melted at a temperature of 120 to 200 ° C, and is sprayed on the surfaces of the first to third media to be joined together to produce a composite fiber filter.

Meanwhile, the second medium for filter manufactured in FIG. 2 is mounted on the second unwinder 330 in the form of a roll, then is fed onto the first medium coated with the adhesive through the guide roller 340, And is rolled into a rewinder 360 and stored.

In this case, the third medium, the fourth medium for the ultrafine dust filter, etc., in which the chemical substance capable of filtering another harmful gas that the first medium and the second medium can not filter, The first and second media can be further laminated onto the laminated sheet. The fourth medium for the ultrafine dust filter may be an electrostatic fiber sheet.

Particularly, the multi-layered composite fiber filter according to the present invention comprises hot melt-bonding the fourth medium for the ultrafine dust filter to the first and second media binding sheets treated with the chemical material, By fabricating a composite fiber filter coated with necessary chemical materials to a desired thickness in multiple layers, 20-30% breathability can be improved when compared to a filter combining a sheet for an ultrafine dust filter with a conventional activated carbon sheet. A spunbonded nonwoven fabric may further be laminated to the ultrafine dust filter for protecting the sheet for ultrafine dust filter.

As described above, the multi-layered composite fiber filter according to the present invention is capable of physically adsorbing various odor generating substances through the porous fiber support to be adhered with oil / inorganic acid, alkali metal, and oxide based catalyst materials, The odor generating material is chemically adsorbed, neutralized and destroyed through catalytic material impregnated on the pore and inner / outer surface to deodorize the generated gas.

FIG. 4 is a comparative graph showing the toluene removal efficiency of the multilayered composite fiber filter and the commercial filter according to the present invention, FIG. 5 is a comparative graph showing the sulfur dioxide removal efficiency together, and FIG. 6 is a comparative graph showing the hydrogen sulfide removal efficiency .

Hereinafter, an improved performance of the multilayer composite fiber filter according to the present invention will be described with reference to FIGS.

≪ Evaluation of toluene removal efficiency &

1. Evaluation procedure

1) The target gas concentration is prepared by diluting air and gas accurately with MFC (precision flow rate control) by applying standard gas.

2) As an example, the multi-layered composite fiber filter according to the present invention is mounted.

3) Flow the target gas and measure the removal concentration of the front and rear ends with a detector tube.

4) Monitor removal efficiency over time to check removal efficiency.

2. Evaluation conditions

Line speed (L.V): 0.4 m / s

Toluene concentration: 80 ppm

Temperature & RH: 25 ± 2 ° C, 45 ± 2% RH

The specifications of the commercial filter used as a comparative example are as follows.

Shape: Bending automobile activated carbon filter

Thickness: 30mm

Width: 250mm

Length: 220mm

Iodine adsorption power: 900mg / g or more

Specific surface area: 950 g / m2 or more

As shown in FIG. 4, the example using the multi-layered composite fiber filter according to the present invention showed an effect of stably removing toluene for a much longer time than the comparative example using a commercial filter.

≪ Evaluation of sulfur dioxide removal efficiency &

The evaluation of toluene removal efficiency was the same as that of Examples and Comparative Example except that the target gas was sulfur dioxide of 80 ppm.

As shown in FIG. 5, the embodiment using the multilayer composite fiber filter according to the present invention showed an effect of stably removing sulfur dioxide for a much longer time than the comparative example using a commercial filter.

≪ Evaluation of hydrogen sulfide removal efficiency &

The evaluation results of sulfur dioxide removal efficiency are the same as those of the examples and comparative examples except that the target gas is hydrogen sulfide at 80 ppm.

As shown in FIG. 6, the embodiment using the multilayer composite fiber filter according to the present invention showed an effect of stably removing hydrogen sulfide for a much longer time than the comparative example using a commercial filter.

INDUSTRIAL APPLICABILITY As described above, the multilayered composite fiber filter and the method of manufacturing the same according to the present invention are excellent in the ability to remove odors and noxious gases, and can be manufactured in various forms such as a bent shape, a sheet shape, a mini plate, It is possible to produce various types of low pressure loss and filter media in a space-constrained air conditioner and a place where a high flow velocity is inevitably generated, and is very effective in removing air and odor gas.

The multi-layered composite fiber filter according to the present invention can be used to remove harmful gases and odorous gases such as air purifiers, food processors, refrigerators, air purifiers, air conditioners, and filters for air conditioners. Even in the case of a combination filter for a vehicle and the like in which water content is present, excellent deodorization performance is stably provided for a long period of time.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (6)

_{KOH, NaOH, KI, KIO 3} , LiOH, NaCO 3 , and the porous support is at least one basic metal compound impregnated selected from NaI;
A porous support impregnated with at least one organic acid-based catalyst material selected from hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, citric acid, sodium hypochlorite, hydrogen peroxide and salicylic acid; And
Wherein the porous support is impregnated with at least one metal oxide material selected from potassium permanganate, sodium permanganate, potassium bichromate and sodium bichromate.
The method according to claim 1,
And a supporter for removing ultrafine dust is further laminated.
The method according to claim 1,
Wherein the basic metal compound, the organic acid catalyst material and the metal oxide material are impregnated in a proportion of 1-20 wt% based on 80-99 wt% of each porous support.
The second composite nonwoven fabric is prepared by mixing the first composite nonwoven fabric with the low melting point fibers (LM) to mix the PP fibers with the low melting point fibers, and the PET fibers and the PP fibers with the low melting point fibers to form the third composite nonwoven fabric Respectively;
A step of attaching a chemical substance to the first, second and third composite nonwoven fabrics, respectively;
Bonding the first, second, and third composite nonwoven fabrics to which the chemical substance is impregnated, with one of heat fusion and hot melt; And
And laminating the electrostatic fibers for removing ultrafine dust to the laminate of the first, second and third composite nonwoven fabrics.
A composite nonwoven fabric is produced from thermoplastic fibers having a high-melting-point resin as a core component and a low-melting-point resin as a cutting component. The monofilament fineness ranges from 1 to 18 denier Producing a nonwoven fabric;
Attaching a chemical substance to each of the first, second, and third nonwoven fabrics;
Bonding the first, second, and third nonwoven fabrics to which the chemical substance is impregnated to one of a hot melt process and a hot melt process; And
And laminating the electrostatic fibers for removing ultrafine dust to the laminate of the first, second and third nonwoven fabrics.
The method according to claim 4 or 5,
And at least one basic metal compound selected from _{KOH, NaOH, KI, KIO 3} , LiOH, NaCO 3 and NaI,
At least one organic acid-based catalyst material selected from hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, citric acid, sodium hypochlorite, hydrogen peroxide and salicylic acid,
Wherein the metal compound is at least one metal oxide selected from potassium permanganate, sodium permanganate, potassium bichromate and sodium bichromate.

Images