KR20180136772A - Filter media consisting of the hydrophilic non-woven fabric and its manufacturing method - Google Patents

Abstract

The present invention relates to a composite filter medium including a hydrophilic nonwoven fabric, and a production method thereof. More specifically, provided is a composite filter medium which is capable of capturing hydrophilic compounds by bonding a hydrophilic nonwoven fabric with a melt blown nonwoven fabric without an increase in differential pressure. Also, provided is a production method thereof. Accordingly, the composite filter medium is capable of maintaining differential pressure while ensuring excellent filtration efficiency as the capturing is repeated.

Description

TECHNICAL FIELD [0001] The present invention relates to a composite filter material including a hydrophilic nonwoven fabric and a method for manufacturing the same. [0002]

The present invention relates to a composite filter material comprising a hydrophilic nonwoven fabric and a method for producing the same. More particularly, the present invention relates to a composite filter material including a hydrophilic nonwoven fabric capable of maintaining a differential pressure while suppressing a decrease in collection efficiency of dust and cigarette smoke, and a method of manufacturing the same.

An air purifier is provided for filtering and removing various foreign substances contained in the air in various devices such as an internal combustion engine, a gas turbine, an air purifier, and an air conditioner. Various types of filter media are installed as filter media in such an air purifier .

The filter media mounted on the air purifier as described above functions to ensure normal operation of the device and to prolong the service life of the device by filtering various foreign substances contained in the air supplied for the operation of the device. Therefore, such filter media must have both a high filtration efficiency for efficiently collecting foreign matter and a long filtration life.

As the air filter material, a filter paper or a nonwoven fabric is mainly used. In particular, a meltblown nonwoven fabric is generally used as a filter paper for an air filter. A meltblown nonwoven fabric is a nonwoven fabric obtained by extruding a thermoplastic resin and then superfine ultrafine fibers by a hot air jet at a high speed It is a self-defect type nonwoven fabric.

Such a meltblown nonwoven fabric is used by being pleated to maximize the efficiency, and the meltblown nonwoven fabric has poor shape stability after bending because of its flexible characteristics. That is, there is a strong tendency to return to the original shape without maintaining the bending form after bending. As a result, the contact efficiency between the air and the filter is deteriorated, resulting in a problem that the filter efficiency is lowered and the differential pressure is increased.

Therefore, it is common to laminate a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a chemical bonded nonwoven fabric, or a wet-laid nonwoven fabric in order to impart shape-retaining performance to the meltblown nonwoven fabric.

The filter media obtained by laminating the spunbond nonwoven fabric, the thermal bond nonwoven fabric, the chemical bond nonwoven fabric, or the meltblown nonwoven fabric laminated with the wet laminated nonwoven fabric has a uniform shape and is excellent in filtration efficiency. However, There is a problem that it is not economical since the use period is not long and the replacement is frequently carried out.

Conventional supports used in air cleaners are generally made of synthetic fibers, and fibers made of a non-hydrophilic polymer such as PET, PE / PET, PP / PET, or nylon are used alone or in combination.

Since the support has a porosity of 50 microns or more, most of the dust in the room is fine dust of 10 microns or less. Therefore, the support used in the air cleaner mainly plays the role of supporting the meltblown nonwoven fabric, There is almost no pre-filter function.

In addition, the dust in the room is evenly distributed hydrophilic and lipophilic particles, and in particular, the smoke that appears when the cigarette is burned contains water, tar and nicotine.

Accordingly, there has been developed a material excellent in being able to collect hydrophilic compounds among the particles present in the air in the support and increase in pressure difference, and thus being used as a filter support.

Korean Patent Publication No. 10-1992-0006104

Disclosure of Invention Technical Problem [8] Accordingly, an object of the present invention is to provide a composite filter material capable of collecting a hydrophilic compound by bonding a hydrophilic nonwoven fabric to a meltblown nonwoven fabric and preventing differential pressure from increasing, and a method for manufacturing the same .

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a meltblown nonwoven fabric comprising a meltblown nonwoven fabric layer having a weight of 5 gsm to 40 gsm and a nonwoven fabric layer having a weight of 50 gsm to 120 gsm And a hydrophilic nonwoven fabric layer, wherein the hydrophilic nonwoven fabric layer comprises hydrophilic fibers.

In an embodiment of the present invention, the hydrophilic fiber may include at least one selected from the group consisting of pulp, rayon, and cotton.

According to an embodiment of the present invention, the weight of the hydrophilic fiber may be 5 wt% to 40 wt% of the total weight of the hydrophilic nonwoven fabric layer.

In an embodiment of the present invention, the composite filter media may have a differential pressure of 1 mmAq to 7 mmAq when cigarette smoke is collected in the composite filter media.

In an embodiment of the present invention, the composite filter material may be a composite filter material having a cigarette smoke collection efficiency of 40% to 99.99%.

According to another aspect of the present invention, there is provided a method of producing a precursor fiber including preparing hydrophilic fibers and precursor fibers comprising polyethylene terephthalate (PET) fibers, Pressing the sheet to form a hydrophilic nonwoven fabric, and bonding the hydrophilic nonwoven fabric to one surface of the meltblown nonwoven fabric, wherein the meltblown nonwoven fabric has a weight of 5 gsm to 40 gsm, And the weight of the nonwoven fabric is 50 gsm to 120 gsm.

In an embodiment of the present invention, the hydrophilic fibers may be at least one selected from the group consisting of pulp, rayon, and cotton.

In an embodiment of the present invention, the weight of the hydrophilic fiber is 5 wt% to 40 wt% of the total weight of the precursor fibers.

In the embodiment of the present invention, the sheeting may be performed by any one or more selected from the group of the nonwoven fabric manufacturing method group consisting of the wet lamination method, the air-laid method and the dry- And the second filter layer is formed on the second filter layer.

In the embodiment of the present invention, the hydrophilic fiber and the polyethylene terephthalate (PET) fiber in the sheet-making may be selected from the group consisting of a thermal-bond method and a chemical bond method. And at least one of them is combined and bonded.

According to an embodiment of the present invention, the hydrophilic nonwoven fabric may further include a step of performing hydrophilization processing on the hydrophilic nonwoven fabric after the step of forming the hydrophilic nonwoven fabric.

In the embodiment of the present invention, the melt blown nonwoven fabric may be manufactured by water repellent processing.

As one effect of the present invention, the hydrophilic nonwoven fabric as the support for the composite filter media can be used to collect hydrophilic compounds in the particles present in the air, and does not increase the differential pressure and can be used for internal combustion engines, gas turbines, Can be effectively used for air purification in various devices of the same type.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a cross-sectional view illustrating a composite filter media according to an embodiment of the present invention.
2 is a flowchart illustrating a method of manufacturing a composite filter material according to an embodiment of the present invention.
3 is an image showing before (FIG. 3 (a)) and after (FIG. 3 (b)) a collecting experiment of Comparative Example 1 according to an embodiment of the present invention.
4 (a) and 4 (b) show an image before (FIG. 4 (a)) and after (FIG. 4 (b)) of the production example 2 according to an embodiment of the present invention.
5 is an image showing a state after the trapping experiment of Production Example 7 according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the composite filter media will be described.

1 is a cross-sectional view illustrating a composite filter media according to an embodiment of the present invention. 1, the composite filter media 10 comprises a meltblown nonwoven fabric layer 11 having a weight of 5 gsm to 40 gsm and a nonwoven fabric layer 12 having a weight of 50 gsm to 120 gsm, gsm, and the hydrophilic nonwoven layer 12 may comprise hydrophilic fibers.

In an embodiment of the present invention, the weight of the meltblown nonwoven layer may be from 5 gsm to 40 gsm. When the weight of the meltblown nonwoven fabric layer is less than 5 gsm, the meltblown nonwoven fabric layer is not preferable because the meltblown fiber can not be fabricated within a desired range. If the weight of the meltblown nonwoven fabric layer exceeds 40 gsm , There is a disadvantage that the pressure difference of the melt blown nonwoven fabric layer rapidly increases.

Further, in the case of exceeding 40 gsm, the weight of the meltblown nonwoven fabric layer is preferably 5 gsm to 40 gsm in view that the production cost of the composite filter material also increases.

In the embodiment of the present invention, the hydrophilic nonwoven fabric layer may include hydrophilic fibers, and the hydrophilic fibers may include at least one kind selected from the group consisting of pulp, rayon, and cotton, Capable hydrophilic fibers can be used without limitation.

In an embodiment of the present invention, the weight of the hydrophilic fiber may be 5% by weight to 40% by weight based on the total weight of the hydrophilic nonwoven fabric layer. A more preferred level may be from 30% to 40% by weight. If the weight of the hydrophilic fiber is less than 5% by weight based on the total weight of the hydrophilic nonwoven fabric layer, efficiency deterioration caused by repeated use of the composite filter media may occur, which is not preferable. If the weight of the hydrophilic fiber exceeds 40 wt% of the total weight of the hydrophilic nonwoven fabric layer, the hydrophilic fiber may be an obstacle to passage of air, which may cause a differential pressure to increase.

In an embodiment of the present invention, the weight of the hydrophilic nonwoven layer may be from 50 gsm to 120 gsm. When the weight of the hydrophilic nonwoven fabric layer is less than 50 gsm, it is not preferable because the diameter of the fiber used for producing the hydrophilic nonwoven fabric can not be fabricated within the desired range. If the weight of the hydrophilic nonwoven fabric layer exceeds 120 gsm There is a disadvantage that the differential pressure of the hydrophilic nonwoven fabric layer increases sharply.

In the embodiment of the present invention, the hydrophilic nonwoven fabric layer may further include at least one of a low melting point fiber and a tackifier resin. The low melting point fiber is a fiber having a melting point of 100 ° C to 180 ° C and further includes a low melting point fiber in the hydrophilic nonwoven fabric layer for the purpose of enhancing bonding strength between fibers in the hydrophilic nonwoven fabric.

The low melting point fiber may include at least one of a low melting point polyethylene terephthalate, a low melting point polypropylene and a low melting point polyethylene, and the fiber having a melting point of 100 ° C to 180 ° C may be used without limitation.

The tackifier resin may be a resin for increasing the degree of tackiness in the hydrophilic nonwoven fabric layer to increase the tensile strength, tear strength, tear strength, friction strength and abrasion strength of the hydrophilic nonwoven fabric layer. Ultimately, the tackifier resin is added to increase the durability of the hydrophilic nonwoven layer and includes, but is not limited to, acrylic resin, PVAC resin, phenolic resin and novolak resin.

In an embodiment of the present invention, the thickness of the hydrophilic nonwoven fabric layer may be 0.2 mm to 0.4 mm. If the thickness of the hydrophilic nonwoven fabric layer is less than 0.2 mm, the hydrophilic compound in the air may not be collected smoothly. If the thickness of the hydrophilic nonwoven fabric layer is more than 0.4 mm, the differential pressure can be increased I do not.

In the embodiment of the present invention, the air permeability is preferably in the range of 250 cfm to 700 cfm in order for the air containing the hydrophilic compound to pass smoothly through the hydrophilic nonwoven fabric layer.

In an embodiment of the present invention, the meltblown nonwoven layer may be located in an air flow out, and the hydrophilic nonwoven layer may be located in an air inlet. Thus, since the air flow is filtered through the air inlet, and the filtered air flows into the air flow outlet, dust in the air is preferentially collected in the hydrophilic nonwoven fabric layer, The dust that has not been captured in the hydrophilic nonwoven fabric layer can be collected in the meltblown nonwoven fabric layer.

In the embodiment of the present invention, when the cigarette smoke having a flow rate of 5.33 cm / sec is collected in the composite filter media, the differential pressure may be 1 mmAq to 7 mmAq, and the differential pressure may be determined not only by the initial differential pressure, And may be at a level that is maintained within a range. This may be because the hydrophilic nonwoven fabric layer plays a role of supporting the hydrophilic compound in the cigarette smoke as well as supporting the composite filter media of the present invention including the hydrophilic nonwoven fabric layer. Accordingly, the differential pressure of the composite filter media is not increased, so that the hydrophilic nonwoven fabric layer may be suitable for use as a support for the composite filter media.

The composite filter media may have a tobacco smoke collection efficiency of 40% to 99.99%. Generally, in the case of a composite filter material which does not use a hydrophilic nonwoven fabric layer as a support, the collection efficiency is lowered to less than 40% as the number of collection times is repeated 10 times or more. In the composite filter material of the present invention, The efficiency can be maintained at a level exceeding 40%. This may be because the hydrophilic nonwoven fabric layer plays a role of supporting the hydrophilic compound in the cigarette smoke as well as supporting the composite filter media of the present invention including the hydrophilic nonwoven fabric layer. Accordingly, the degree of reduction of the collection efficiency of the composite filter media is small, and the hydrophilic nonwoven fabric layer may be suitable for use as a support for the composite filter media.

Hereinafter, a method of manufacturing a composite filter material will be described.

2 is a flowchart illustrating a method of manufacturing a composite filter material according to an embodiment of the present invention. Referring to FIG. 2, the method for fabricating the composite filter material includes preparing a precursor fiber including hydrophilic fibers and polyethylene terephthalate (PET) fibers (S100), forming a precursor fiber sheet (S200), pressing the sheet to form a hydrophilic nonwoven fabric (S300), and bonding the hydrophilic nonwoven fabric to one surface of the meltblown nonwoven fabric (S400), wherein the meltblown nonwoven fabric has a weight 5 gsm to 40 gsm, and the weight of the hydrophilic nonwoven fabric may be 50 gsm to 120 gsm.

First, precursor fibers including hydrophilic fibers and polyethylene terephthalate (PET) fibers are prepared (S100).

In the embodiment of the present invention, the hydrophilic fiber may include at least one kind selected from the group consisting of pulp, rayon, and cotton, and the hydrophilic fiber capable of collecting the hydrophilic compound in the air may be used without limitation have.

The polyethylene terephthalate fiber may be a fiber for use as a support for a hydrophilic nonwoven fabric.

In an embodiment of the present invention, the precursor fiber may be a component of the hydrophilic nonwoven fabric, and may include at least one of a low melting point fiber and a tackifier resin in addition to the hydrophilic fiber and the polyethylene terephthalate fiber. The low melting point fiber and the tackifier resin may be prepared as precursor fibers and constitute a component of the hydrophilic nonwoven fabric.

The low melting point fiber may include at least one of a low melting point polyethylene terephthalate, a low melting point polypropylene and a low melting point polyethylene, and the fiber having a melting point of 100 ° C to 180 ° C may be used without limitation.

The tackifier resin may be a resin for increasing the tensile strength, tear strength, tear strength, friction strength and abrasion strength of the hydrophilic nonwoven fabric by increasing the degree of tackiness in the hydrophilic nonwoven fabric. Ultimately, the tackifier resin is added to increase the durability of the hydrophilic nonwoven fabric and includes, but is not limited to, acrylic resin, PVAC resin, phenol resin, and novolak resin.

Next, the precursor fibers are sheeted to form a sheet (S200).

In an embodiment of the present invention, the weight of the hydrophilic fiber may be 5% by weight to 40% by weight based on the total weight of the precursor fibers. A more preferred level may be from 30% to 40% by weight. If the weight of the hydrophilic fibers is less than 5 wt% based on the total weight of the precursor fibers, efficiency deterioration may be caused by repeated use of the composite filter media. If the weight of the hydrophilic fiber exceeds 40 wt% of the total weight of the precursor fibers, the hydrophilic fiber may be an obstacle for air to pass through, leading to a problem that the differential pressure may increase.

In the embodiment of the present invention, the sheeting may be performed by any one or more selected from the group of the nonwoven fabric manufacturing method group consisting of the wet lamination method, the air-laid method and the dry- Lt; / RTI >

As a concrete example, if the sheeting is a wet-laid method, the hydrophilic fiber and the polyethylene terephthalate fiber are cut to prepare respective fiber tufts, the blend is blended to prepare a blend, To form a slurry. The slurry is floated on the surface of the water using left and right vibrations to form a web, and the web is dried and dried to form a sheet. At this time, at least one or more of a dispersant, a defoaming agent, and a thickener may be further added.

In the embodiment of the present invention, the hydrophilic fiber and the polyethylene terephthalate (PET) fiber in the sheet-making may be selected from the group consisting of a thermal-bond method and a chemical bond method. And may be combined with one or more to strengthen the bonding force between the hydrophilic fiber and the polyethylene terephthalate so as to prevent the fibers from falling off in the hydrophilic nonwoven fabric to be formed later.

Next, the sheet is pressed to form a hydrophilic nonwoven fabric (S300).

In the embodiment of the present invention, the pressing method may use a general physical pressing method such as a roller, and the pressing method of the present invention is not limited by the method.

In the embodiment of the present invention, after the step of forming the hydrophilic nonwoven fabric, the hydrophilic nonwoven fabric may further include a step of performing hydrophilization processing on the hydrophilic nonwoven fabric. So that the collection efficiency of the hydrophilic compound in the air can be enhanced.

The hydrophilic processing may be chemical processing or plasma processing, but is not limited thereto. As a specific example, the hydrophilic processing may be a method of applying a hydrophilic group to the hydrophilic nonwoven fabric by treatment with an aqueous alkali solution, or a method of treating the surface of the hydrophilic nonwoven fabric by using atmospheric plasma.

In an embodiment of the present invention, the weight of the hydrophilic nonwoven fabric may be from 50 gsm to 120 gsm. When the weight of the hydrophilic nonwoven fabric is less than 50 gsm, the diameter of the fibers used for producing the hydrophilic nonwoven fabric can not be fabricated within the desired range. If the weight of the hydrophilic nonwoven fabric exceeds 120 gsm , There is a disadvantage that the differential pressure of the hydrophilic nonwoven fabric rapidly increases.

Finally, the hydrophilic nonwoven fabric is bonded to one surface of the meltblown nonwoven fabric (S400).

In an embodiment of the present invention, the weight of the meltblown nonwoven fabric may be from 5 gsm to 40 gsm. When the weight of the meltblown nonwoven fabric is less than 5 gsm, the meltblown fiber can not be fabricated within the desired range. If the weight of the meltblown nonwoven fabric exceeds 40 gsm, There is a drawback that the differential pressure of the meltblown nonwoven fabric layer increases sharply.

Furthermore, in the case of exceeding 40 gsm, the weight of the meltblown nonwoven fabric is preferably 5 gsm to 40 gsm, in view of the increase in the production cost of the composite filter material.

In an embodiment of the present invention, the bonding method may be performed by one or more kinds selected from the group of bonding methods consisting of hot melt bonding, ultrasonic bonding, chemical bonding, and heat treatment after needle punching, but is not limited thereto do.

In the embodiment of the present invention, the meltblown nonwoven fabric may be manufactured through water-repellent processing, and the water-repellent processing may further enhance the water repellency of the meltblown nonwoven fabric, thereby increasing the collection efficiency of the water repellent compound.

The water-repellent processing may include, but is not limited to, an impregnation method, a spray method, or a coating method.

Hereinafter, Preparation Examples and Experimental Examples of the present invention will be described. However, these production examples and experimental examples are intended to explain the constitution and effects of the present invention more specifically, and the scope of the present invention is not limited thereto.

[Production Example 1]

50 weight% of polyethylene terephthalate (PET) fibers having a length of 5 mm, a denier of 3 denier, 30 weight% of 1.2 denier low melting point fibers and 20 weight% of pulp were mixed to prepare a mixture having a weight of 70 gsm, And a hydrophilic nonwoven fabric exhibiting a pressure loss of 0.15 mmAq at a flow rate of 5.33 cm / sec. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 mmAq to 2.8 mmAq to prepare a composite filter media having a thickness of 0.49 mm.

[Production Example 2]

3 deniers, 40 wt% polyethylene terephthalate (PET) fibers having a length of 5 mm, 30 wt% of 1.2 denier low melting point fibers and 30 wt% And a pressure loss of 0.2 mmAq at a flow rate of 5.33 cm / sec. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 mmAq to 2.8 mmAq to prepare a composite filter media having a thickness of 0.43 mm.

[Production Example 3]

3 denier, 30 wt% polyethylene terephthalate (PET) fiber having a length of 5 mm, 30 wt% of 1.2 denier low melting point fibers and 40 wt% And a hydrophilic nonwoven fabric exhibiting a pressure loss of 0.6 mmAq at a flow rate of 5.33 cm / sec. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 to 2.8 mmAq to prepare a composite filter material having a thickness of 0.49 mm.

[Production Example 4]

3 deniers, 30 wt% polyethylene terephthalate (PET) fibers having a length of 5 mm, 20 wt% of 1.2 denier low melting point fibers and 50 wt% And a hydrophilic nonwoven fabric exhibiting a pressure loss of 0.8 mmAq at a flow rate of 5.33 cm / sec. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 mmAq to 2.8 mmAq to prepare a composite filter media having a thickness of 0.49 mm.

[Production Example 5]

A hydrophilic nonwoven fabric having a weight loss of 70 gsm and a pressure loss of 1.8 mmAq at a flow rate of 0.24 mm and a flow rate of 5.33 cm / sec was prepared by 100% by weight of pulp. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 mmAq to 2.8 mmAq to prepare a composite filter media having a thickness of 0.49 mm.

[Production Example 6]

3 deniers, 40 wt% polyethylene terephthalate (PET) fibers having a length of 5 mm, 30 wt% of 1.2 denier low melting point fibers and 30 wt% And a pressure loss of 0.2 mmAq at a flow rate of 5.33 cm / sec. Then, a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97%, and a pressure loss of 2.7 mmAq to 2.8 mmAq was mixed with 5% by weight of a fluorine compound to the polypropylene raw material to increase the water repellency. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having increased water repellency to prepare a composite filter material having a thickness of 0.43 mm.

[Production Example 7]

A polyethylene terephthalate (PET) low melting point fiber having a density of 15 denier, 52 mm and 70% by weight of cotton fibers having a diameter of 15 microns was mixed to prepare a mixture having a weight of 70 gsm and a thickness of 0.26 mm And a hydrophilic nonwoven fabric exhibiting a pressure loss of 0.1 mmAq at a flow rate of 5.33 cm / sec. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 mmAq to 2.8 mmAq to prepare a composite filter media having a thickness of 0.5 mm.

[Comparative Example 1]

15 denier, polyethylene terephthalate (PET) low melting point fiber having a length of 52 mm, hydrophilic nonwoven fabric exhibiting a pressure loss of 0.1 mmAq at a weight of 70 gsm, a thickness of 0.23 mm and a flow velocity of 5.33 cm / sec, . The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97% and a pressure loss of 2.7 mmAq to 2.8 mmAq to prepare a composite filter media having a thickness of 0.43 mm.

[Comparative Example 2]

15 denier, polyethylene terephthalate (PET) low melting point fiber having a length of 52 mm, hydrophilic nonwoven fabric exhibiting a pressure loss of 0.1 mmAq at a weight of 70 gsm, a thickness of 0.23 mm and a flow velocity of 5.33 cm / sec, . Then, a meltblown nonwoven fabric having a thickness of 0.25 mm, an efficiency of 99.97%, and a pressure loss of 2.7 mmAq to 2.8 mmAq was mixed with 5% by weight of a fluorine compound to the polypropylene raw material to increase the water repellency. The hydrophilic nonwoven fabric was bonded to a meltblown nonwoven fabric having increased water repellency to prepare a composite filter material having a thickness of 0.43 mm.

[Experimental Example 1]

Compound filter Media  Filtration efficiency and Differential pressure  analysis

In order to analyze the filtration efficiency and the differential pressure of the composite filter media of the production examples and the comparative examples, the composite filter media was placed in a chamber of 1 m ³ , two cigarettes were ignited, and a single-stage blowing was performed for 30 minutes. After 30 minutes of operation, if the cigarette smoke remains in the chamber, the additional operation is continued, and the additional operation is continued for 10 minutes and the operation is continued for a maximum of 30 minutes. The composite filter media with blowing process was sealed in vinyl and the differential pressure and filtration efficiency were measured with TSI-8130.

[Table 1]

Referring to Table 1, the initial performance of Comparative Example 1 using a PET support was excellent, but filtration efficiency was drastically decreased as the collection was repeated. Further, in the case of Production Example 3 to 5, in which the content of pulp is high, and Production Example 2, which is a support in which the pulp content is too small, the filtration efficiency due to repetition of the collection is excellent, but the circulation of air is free . In addition, the use of water - repellent meltblown showed higher filtration efficiency than that of water - repellent meltblown. However, it was confirmed that air circulation was not free because of high differential pressure.

Therefore, it is preferable to add an appropriate amount of pulp to satisfy the proper filtration efficiency and differential pressure characteristics of the composite filter media, and the optimum content may be 30 wt%.

[Experimental Example 2]

Compound filter Media Capture  Degree analysis

3 (a) and 3 (b). FIG. 4 is an image before (FIG. 3 (a)) and (Fig. 3 (b)). 3 to 4, in Comparative Example 1 in which the pulp was not contained in the support, the color was not significantly different from that before the experiment even after the collection experiment, so that the collection efficiency was low. On the other hand, in Production Example 2 in which pulp was contained in the support, the color of the composite filter media after the collection experiment was changed to dark, indicating that the production efficiency of Production Example 2 was excellent.

Fig. 5 is an image showing the result after the collection experiment of Production Example 7. Fig. Referring to FIG. 5, in Production Example 7 containing cotton in the support, it was confirmed that cigarette smoke was collected on the support after the collection experiment.

Based on these results, it can be judged that the filtration efficiency and the differential pressure performance are excellent when the hydrophilic fibers such as pulp or rayon are contained as the support of the composite filter media at the level of 30 wt%.

In addition, when the meltblown nonwoven fabric is subjected to water-repellent processing, it can be judged that the filtration efficiency and differential pressure performance due to the repetition of the collection are improved.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: Composite filter media
11: hydrophilic nonwoven fabric layer
12: Meltblown nonwoven fabric layer

Claims (12)

A meltblown nonwoven fabric layer having a weight of 5 gsm to 40 gsm; And
A hydrophilic nonwoven fabric layer on one surface of the meltblown nonwoven fabric layer and having a weight of 50 gsm to 120 gsm,
Wherein the hydrophilic nonwoven fabric layer comprises hydrophilic fibers.
The method according to claim 1,
Wherein the hydrophilic fiber comprises at least one selected from the group consisting of pulp, rayon and cotton.
The method according to claim 1,
Wherein the weight of the hydrophilic fiber is 5 wt% to 40 wt% of the total weight of the hydrophilic nonwoven fabric layer.
The method according to claim 1,
Wherein the differential pressure when the tobacco smoke is collected in the composite filter media is from 1 mmAq to 7 mmAq.
The method according to claim 1,
Wherein the composite filter media has a cigarette smoke collection efficiency of 40% to 99.99%.
Preparing a precursor fiber comprising hydrophilic fibers and polyethylene terephthalate (PET) fibers;
Forming a sheet by forming the precursor fibers into a sheet;
Pressing the sheet to form a hydrophilic nonwoven fabric; And
And bonding the hydrophilic nonwoven fabric to one surface of the meltblown nonwoven fabric,
Wherein the meltblown nonwoven fabric has a weight of 5 gsm to 40 gsm and the weight of the hydrophilic nonwoven fabric is 50 gsm to 120 gsm.
The method according to claim 6,
Wherein the hydrophilic fiber comprises at least one selected from the group consisting of pulp, rayon, and cotton.
The method according to claim 6,
Wherein the weight of the hydrophilic fibers is 5 wt% to 40 wt% of the total weight of the precursor fibers.
The method according to claim 6,
Wherein the sheet formation is carried out by any one or more selected from the group of the nonwoven fabric manufacturing methods consisting of a wet lamination method, an air-laid method and a dry-laid method. Method of manufacturing filter media.
The method according to claim 6,
In the sheeting, the hydrophilic fibers and the polyethylene terephthalate (PET) fibers may be bonded together by any one or more selected from the group consisting of a thermal bonding method and a chemical bonding method Wherein the composite filter material is produced by a method comprising the steps of:
The method according to claim 6,
Further comprising: after the step of forming the hydrophilic nonwoven fabric, performing hydrophilization processing on the hydrophilic nonwoven fabric.
The method according to claim 6,
Wherein the meltblown nonwoven fabric is manufactured through water-repellent processing.

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