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    • 专利摘要:
    filter media, method of manufacturing the same, and filter apparatus using the filter media. a filter medium, a method of manufacturing the same and a filter apparatus using the filter medium are provided. the filter medium includes: a porous substrate; a nanofiber mat that is laminated on both sides of the porous substrate and that has numerous fine pores formed through electrospinning a polymer material; and an adhesive unit for integrally adhering the porous substrate and the nanofiber mat, in which the adhesive unit is achieved through the application of heat, whose temperature is lower than the melting point of the porous substrate and higher than the melting point of nanofiber blanket.
    公开号:BR112015019842B1
    申请号:R112015019842-2
    申请日:2014-02-18
    公开日:2021-08-17
    发明作者:Jun Sik Hwang；Kyung Su Kim
    申请人:Amogreentech Co., Ltd；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [001] The present invention relates to a water treatment filter and, more specifically, to a filter medium that employs nanofiber mats produced through the use of an electrospinning method, a method of manufacturing the filter medium and a filter apparatus that uses the same. TECHNICAL BACKGROUND
    [002]Recent industrial advances have demanded high purity and high quality of products and thus a separator (or a membrane) technology has been recognized as a very important field. In the environmental sector especially, as the need for clean water and concern about a water shortage increase, a membrane technology has attracted considerably a lot of attention as one of the ways to solve these problems.
    [003] Processes such as water purification, sewage, wastewater and desalination that use a membrane are already widespread. Furthermore, membrane technology has been developed for applications away from the membrane itself and has expanded into surrounding technology development as well as having marked membrane performance enhancement according to the applications.
    [004] The membrane is a substance that has a selection capacity that is present between two different materials. In other words, the membrane means a substance that serves to selectively cross or exclude a material. The structures and substances of the membrane, and the conditions and principles of movement of the materials that cross the membrane, have no limitations. When a substance is located between just two materials to insulate the two materials from each other, and selective movement of the materials through the substance between the two materials takes place, the substance can be called a membrane.
    [005] Membranes are of a wide variety of types and are classified according to various criteria.
    [006] First, a classification by a separation operation is a classification method that depends on the state of a target material to be separated, and is classified into a liquid separation method, a liquid-gas separation method, a gas separation method, and so on. The liquid separation method is classified into microfiltration, ultrafiltration, nanofiltration, reverse osmosis filtration, etc., according to the size of an object for filtration.
    [007] The gas separation method is classified in detail according to the type of gas to be separated. The gas separation membrane is classified into an oxygen-enriched membrane to separate oxygen gas, a nitrogen-enriched membrane to separate nitrogen gas, a hydrogen-enriched membrane to separate hydrogen gas, a dehumidification film to remove moisture, etc.
    [008] The membrane is classified according to a film-like shape and is classified into a flat membrane, a hollow fiber membrane, a tubular membrane, etc. In addition, the membrane is also classified into a plate-shaped type, a spiral-wound type, a cartridge type, a flat cell membrane type, an immersion type, a tubular type and others, depending on the shape of a filter module.
    [009] The membrane is classified according to a material and is classified into an inorganic film and an organic film that uses a polymer film. In recent years, however, inorganic films have expanded their use based on the advantages of heat resistance, durability, etc. The most commercialized products today are polymer membranes.
    [010] In general, filtration means to remove two or more components from a fluid, that is, it means to separate undissolved particles (solids) from the fluid. The filtration mechanisms in the separation of solid materials can be described as sieving, adsorption, dissolution and diffusion mechanisms. Except for some membranes like gas separation membranes, reverse osmosis membranes, etc., it can be said that most filtration mechanisms depend entirely on the sieving mechanism.
    [011]Therefore, it is possible to use any materials with pores as filter media. Non-woven (non-woven) cloths, woven (woven) cloths, knits, porous membranes and the like are typical filter media.
    [012]It is difficult to produce pores smaller than 1 µm in the case of non-woven fabrics, fabrics, knits, etc. Thus, nonwovens, wovens, knits, etc. are used as a pretreatment filter concept with a limitation to a particle filtration area. In the meantime, porous membranes can produce fine, small pores and have been used for a process that requires a wide range of filtration areas and the highest precision such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis filtration , etc.
    [013]Since nonwovens, fabrics or knits are made of fibers that have a thickness of several micrometers to several hundred micrometers, it is difficult to produce fine pores of less than 1 µm. In particular, it is not actually possible to create uniform pores, since mats are formed by the random arrangement of fibers in the case of non-woven fabrics. Blown blown non-woven fabric can be called a non-woven fabric made of a very fine fiber that has a diameter of 1 to 5 µm. The pore size before thermocalendering is no less than six micrometers and the pore size after thermocalendering is only approximately three micrometers. The discrepancy in mean pore size occurs by more than ± 20% around a reference point, and blow-melted nonwoven fabric has a structure in which very large pores coexist.
    [014] Consequently, non-wovens, fabrics or knits have difficulty in preventing the leakage of contaminated materials through relatively large pores and thus have low filter efficiency. Therefore, filter media is used in an imprecise filtration process or used as a pre-treatment concept of an accurate filtration process.
    [015] In the meantime, the porous membrane is prepared by a method such as a non-solvent induced phase separation process (NIPS), a thermally induced phase separation process (TIPS), a stretching process, an etching process of stripe, a sol-gel process, etc. The materials of most porous membranes are made from representative organic polymers such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), nylon (Nylon6 or Nylon66), polysulfone (PS), polyethersulfone (PES), polypropylene (PP) , polyethylene (PE), nitrocellulose (NC) or the like. Although conventional porous membranes can create fine and small pores in size, closed pores or shielded pores can inevitably be created in the manufacturing process. As a result, conventional porous membranes have problems such as a small amount of filtration flow, a high drive pressure and a short filtration lift cycle, thus causing high operating costs and frequent filter replacement.
    [016] Korean patent application publication No. 2013-0011192 discloses a method of producing an alumina composite nonwoven fabric which includes a first step of performing a plasma treatment of an alumina fiber nonwoven fabric. thermoplastic polymer that modifies the surface of the non-woven fabric and a second step of depositing the alumina on the cloth with treated surface. However, filter media using alumina composite nonwoven fabric do not have fiber cut damage, and are also excellent in virus removal performance, but have a disadvantage of low filtration efficiency due to size. large pore size of non-woven fabric. REVELATION Technique Problem
    [017] To solve the above problems or defects, an objective of the present invention is to provide a filter medium that uses a nanofiber mat formed by an electrospinning method, to thereby improve strength and freely control size of pore, to thereby produce a variety of products in accordance with an intended use, a method of manufacturing the filter media, and a filter apparatus using the filter media.
    [018] Another objective of the present invention is to provide a filter medium that uses a nanofiber mat formed by an electrospinning method, to thereby allow the thickness of the filter medium to become thin and thus , the thickness of a filter plate becomes thin, to consequently laminate a large number of filter plates in a small space to thereby reduce the size of a filtration system, a method of manufacturing filter media and a filter apparatus using the filter medium.
    [019] Yet another objective of the present invention is to provide a filter medium that is prepared by laminating a nanofiber mat that has fine three-dimensional pores and a non-woven fabric, to thereby achieve excellent handling and resistance, and improve filter efficiency, a method of manufacturing the filter media, and a filter apparatus that uses the filter media. Technique Solution
    [020]To accomplish the above objectives and other objectives of the present invention, according to an aspect of the present invention, a filter medium is provided comprising: a porous substrate; a nanofiber mat that is laminated on both sides of the porous substrate and that has numerous fine pores formed by electrospinning a polymer material; and an adhesive unit for integrally adhering the porous substrate and the nanofiber mat, wherein the adhesive unit has a thermal melting structure that is achieved through the application of heat, the temperature of which is less than the melting point of the porous substrate. and greater than the melting point of the nanofiber mat.
    [021] Alternatively, the adhesive unit has a thermal melting structure that is achieved through the application of heat, whose temperature is higher than the melting point of the porous substrate and lower than the melting point of the nanofiber mat.
    [022] In addition, the adhesive unit can be a hot melt powder or a hot melt mat. The hot melt powder is placed in a dot arrangement pattern to thereby obtain an air permeability after adhesion, and the hot melt blanket has a plurality of fine pores, it is possible to ensure the permeability to air after adhesion.
    [023] In addition, the porous substrate is a non-woven fabric of any one of a polyester-based, nylon-based, polyolefin-based, and cellulose-based non-woven fabric, and the material of polymer that forms the nanofiber mat comprises a polyvinylidene fluoride (PVdF).
    [024]Furthermore, the polymer material is a blend of PVdF and polyacrylonitrile (PAN) in a ratio of 5:5 or 6:4.
    [025] In addition, the thermal fusion structure is a structure that is 1/5 to 1/2 the thickness of the nanofiber mat that is penetrated and glued to the non-woven fabric, or 1/5 to 1/2 the thickness of the non-woven fabric which is penetrated and glued to the non-woven fabric.
    [026] In addition, the nanofiber mat has a structure in which the nanofiber mat is laminated on the entire surface except the upper surface of the non-woven fabric.
    [027] According to another aspect of the present invention, there is provided a filter medium comprising: a porous substrate; and a nanofiber mat that is laminated on both sides of the porous substrate and that has numerous fine pores formed by electrospinning a polymer material, wherein the nanofiber mat comprises a first layer of nanofiber mat that is formed through the electrospinning a low concentration polymer material blending solution and a second layer of nanofiber mat which is formed by electrospinning a high concentration polymer material blending solution.
    [028] In addition, the polymer material mixing solution with low concentration contains a polymer material of 8 to 10% by weight, and the polymer material mixing solution with high concentration contains a polymer material of 15 to 17% by weight.
    [029] According to another aspect of the present invention, there is provided a method of manufacturing a filter medium comprising the steps of: preparing a non-woven fabric; electrospinning a polymer material onto a removable paper to form a nanofiber mat; and laminate the nanofiber mat on both surfaces of the non-woven fabric, and heat the laminate resulting in a temperature lower than the melting point of the non-woven fabric and higher than the melting point of the nanofiber mat, melting, of this thermally form the non-woven fabric and the nanofiber blanket.
    [030]Alternatively, thermal fusion is achieved through the application of heat, whose temperature is higher than the melting point of the porous substrate and lower than the melting point of the nanofiber mat.
    [031] According to another aspect of the present invention, there is provided a method of manufacturing a filter medium comprising the steps of: preparing a non-woven fabric; electrospin a low concentration polymer material blending solution containing an 8 to 10% by weight polymer material, and a high concentration polymer material blending solution containing a 15 to 17% polymer material by weight in sequence, on a surface of the non-woven fabric, to form, in this way, a nanofiber mat; and electrospinning the low concentration polymer material blending solution containing the polymer material from 8 to 10% by weight, and the high concentration polymer material blending solution containing the polymer material from 15 to 17% by weight in sequence, on the other surface of the non-woven fabric, to thereby form a nanofiber mat.
    [032] According to another aspect of the present invention, there is provided a method of manufacturing a filter medium comprising the steps of: preparing a non-woven fabric; electrospinning a polymer material onto a removable paper to form a nanofiber mat; and laminating and thermally melting the nanofiber mat through a hot melt powder or hot melt mat on both surfaces of the non-woven fabric.
    [033] According to another aspect of the present invention, there is provided a filter apparatus comprising: a housing having an inlet and an outlet for sewage or wastewater; a plurality of filter means being arranged at a predetermined interval in the housing, and for filtering waste water stored in the housing; and a pump that is connected to the outlet to pump water from the housing, or supply wash water to the housing.
    [034]The filter apparatus further comprises a nozzle for generating bubbles, which is provided on one side of the housing and washes out a filter medium. Advantageous Effects
    [035] As described above, the present invention provides a filter medium that is formed by gluing a nanofiber mat formed by a method of electrospinning on both sides of a non-woven fabric through the use of a structure of thermal melting or a hot melt adhesive, to thereby improve strength and freely control pore size, to thereby produce a variety of products according to an intended use.
    [036] In addition, the present invention provides a filter medium that uses a nanofiber mat formed by an electrospinning method, to thereby allow the thickness of the filter medium to become thin and thus the The thickness of a filter plate becomes thin, to consequently laminate a large number of filter plates into a small space to thereby reduce the size of a filtration system.
    [037] Additionally, the present invention provides a filter medium that is prepared by laminating a nanofiber mat having fine three-dimensional pores and a non-woven fabric, to thereby provide a filter apparatus with the ability to achieve excellent handling and strength, and improve filter efficiency. Description of Drawings
    [038] Figure 1 is a cross-sectional view of a filter apparatus according to an embodiment of the present invention.
    [039] Figure 2 is a plan view of a filter medium according to an embodiment of the present invention.
    [040] Figure 3 is a cross-sectional view of a filter medium according to an embodiment of the present invention.
    [041] Figure 4 is an approximation photograph of nanofiber mats according to an embodiment of the present invention.
    [042] Figure 5 is a schematic diagram of an electrospinning apparatus for forming a nanofiber mat of a filter medium according to an embodiment of the present invention.
    [043] Figure 6 is a partial section view illustrating a filter medium according to an embodiment of the present invention.
    [044] Figure 7 is an enlarged cross-sectional view of a nanofiber mat that is applied to a filter medium according to an embodiment of the present invention. Best Mode
    [045] Hereinafter in the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings. In the process, the sizes and shapes of components illustrated in the drawings may be shown exaggerated for convenience and clarity of explanation. Additionally, by considering the configuration and operation of the present invention, specifically defined terms can be changed according to user or operator intent, or predefined settings. The definitions of these terms in the present invention need to be made based on the contents throughout the application.
    [046] Figure 1 is a cross-sectional view of a filter apparatus according to an embodiment of the present invention.
    [047] Referring to Figure 1, a filter apparatus in accordance with an embodiment of the present invention includes: a housing 10 into which sewage or wastewater is externally introduced and stored; a plurality of filter means 20 that are disposed at a predetermined interval in housing 10, and for filtering sewage or wastewater stored in housing 10; and a plurality of bubble generating nozzles 30 which are disposed on the underside of the housing 10 to thereby function to clean the filter means 20.
    [048] The housing 10 is provided with an inlet 12 through which water to be purified, for example polluted water such as sewage water or waste water is introduced, and an outlet 14 which is formed on the upper side of the housing 10 and through from which the purified water in housing 10 is externally discharged.
    [049] As shown in Figures 2 and 3, each of the filter means 20 includes: a non-woven fabric 22 having a plurality of pores through which water can pass; a first nanofiber mat 24 which is laminated onto a surface of the non-woven fabric 22 and which has fine pores capable of filtering water; and a second nanofiber mat 26 which is laminated over the other surface of the non-woven fabric 22 and which has fine pores capable of filtering water.
    [050] Filter means 20 are arranged at a predetermined interval in housing 10 and filter the sewage or wastewater stored in housing 10.
    [051]Here, the non-woven fabric that can be used in the present invention is any one of, for example, a blow-fused non-woven fabric, a glue spun non-woven fabric, a non-woven fabric glued by heat, a chemically bonded non-woven fabric and a wet-laid non-woven fabric. The non-woven fabric can include fibers having diameters from about 30 µm to about 60 µm, and pores having diameters from about 50 µm to about 200 µm.
    [052] The non-woven fabric 22 includes a large number of pores and thus plays a role of a trajectory through which water can pass, as well as a support layer to support the first nanofiber mat 24 and the second mat of nanofiber 26 to keep a flat type.
    [053] In the present invention, the filter medium can be implanted by laminating a nanofiber mat on both sides of a non-woven fabric as a porous substrate that has numerous pores, in which the nanofiber mat has numerous pores fines formed by electrospinning a polymer material. In that case, the filter medium can include an adhesive unit to adhere the non-woven fabric and the nanofiber mat integrally.
    [054]The adhesive unit can have a thermal fusion structure that is achieved through the application of heat, whose temperature is lower than the melting point of the porous substrate and higher than the melting point of the nanofiber mat.
    [055] The porous substrate can be a non-woven fabric of any one of a polyester-based, nylon-based, polyolefin-based, and cellulose-based non-woven fabric, and the polymer material that forms the Nanofiber mat can include a polyvinylidene fluoride (PVdF).
    [056] Additionally, the polymer material that is electrospinned to form the nanofiber mat is a mixture of PVdF and polyacrylonitrile (PAN) in a ratio of 5:5 or 6:4, and the thermal fusion structure is a structure that is 1/5 to 1/2 the thickness of the nanofiber mat that is penetrated and glued to the non-woven fabric.
    [057] As described above, when thermal compression is performed through the application of heat, whose temperature is lower than the melting point of the porous substrate and higher than the melting point of the nanofiber mat, a portion of the nanofiber mat, that is, 1/5 to 1/2 the thickness of the nanofiber mat is fused and penetrated and strongly adhered to the porous substrate, eg, to non-woven fabric.
    [058] Alternatively, the thermal fusion structure is achieved through thermal compression and bonding of two members, that is, the porous substrate and the nanofiber mat, through the application of heat, whose temperature is greater than the melting point of the porous substrate and lower than the melting point of the nanofiber mat. In this case, 1/5 to 1/2 the thickness of the porous substrate is fused and penetrated and tightly adhered to the porous substrate, eg, non-woven fabric.
    [059] In the filter medium that has a thermal fusion structure as described above, the nanofiber mat can have a structure in which the nanofiber mat is laminated on the entire surface except the upper surface of the porous substrate, that is, from the non-woven fabric.
    [060] In the meantime, according to another aspect of the invention, a filter medium can also be configured by direct electrospinning a first nanofiber mat 24 and a second nanofiber mat 26 onto a porous substrate, i.e., a non-woven fabric for the purpose of being strongly adhered to it.
    [061] That is, as shown in Figure 4, the first nanofiber mat 24 and the second nanofiber mat 26 are formed through the use of a process that has the steps of: preparing a spinning solution by mixing a ma - polymer material and a solvent at a constant mixing ratio at which the polymer material can be electrospinned; forming 112 and 114 nanofibers by electro-spinning the spinning solution; and accumulating the nanofibers 112 and 114 on the surface of the non-woven fabric 22 to thereby have fine pores 110 through which water can be filtered.
    [062]Here, the diameters of nanofibers 112 and 114 are preferably in the range of 0.1 µm to 3.0 µm.
    [063] The thicknesses of the first nanofiber mat 24 and the second nanofiber mat 26 are freely adjusted according to the electrospinning time of the electrospinning apparatus, and the pore sizes 110 are determined by the thicknesses of the nanofiber mats.
    [064] Therefore, since the pore sizes 110 of the first nanofiber mat 24 and the second nanofiber mat 26 can be freely adjusted in the present embodiment, the pore sizes 110 can be produced in various ways according to the type of a filter.
    [065]Therefore, filter media that is configured by forming a nanofiber mat by directly electrospinning a polymer material on both sides of a non-woven fabric as described above, includes: a substrate porous; and a nanofiber mat that is formed by direct electrospinning a polymer material on both sides of the porous substrate on which the nanofiber mat has fine pores.
    [066] In this case, the nanofiber mat includes a first layer of nanofiber mat that is formed by electrospinning a low concentration polymer material mixture solution and a second layer of nanofiber mat that is formed through electrospinning of a high concentration polymer material mixture solution. Here, the first layer of nanofiber mat can be formed by a coating or spraying method as well as electrospinning.
    [067] In addition, the polymer material mixing solution with low concentration contains a polymer material of 8 to 10% by weight, and the polymer material mixing solution with high concentration contains a polymer material of 15 to 17% by weight.
    [068] The polymer material used for embodiments of the present invention may include, for example, hydrophilic polymers or/and hydrophobic polymers that can be electrospinned, or may include one type of the polymers or a mixture of two or more types of the polymers.
    [069] The polymer materials used in the embodiments of the present invention may be resins that can be dissolved in an organic solvent for electrospinning, and that may be able to form nanofibers through electrospinning, but are not specifically limited to that. For example, the polymer materials used in the present invention can be: polyvinylidene fluoride (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), perfluoropolymer, polyvinyl chloride, polyvinylidene chloride, or copolymers thereof; polyethylene glycol derivative containing polyethylene glycol dialkyl ether and polyethylene glycol dialkyl ester; poly(oxymethylene-oligo-oxyethylene); polyoxide containing polyethylene oxide and polypropylene oxide; polyvinyl acetate, poly(vinyl pyrrolidone-vinyl acetate), polystyrene, and an acrylonitrile polystyrene copolymer; a polyacrylonitrile copolymer containing polyacrylonitrile (PAN) and a polyacrylonitrile methyl methacrylate copolymer; or polymethyl methacrylate, a copolymer of polymethyl methacrylate or a mixture thereof.
    [070] Also, the polymer material used in the present invention can be: aromatic polyester such as polyamide, polyimide, polyamideimide, poly(meta-phenylene isophthal amide), polyester sulfone (PES), polyether ketone, polyetherimide (PEI), polyethylene terephthalate, polytrimethylene terephthalate or polyethylene naphthalate; polyphosphazene such as polytetrafluoroethylene, polydiphenoxyphosphazene, poly{bis[2-(2-methoxyethoxy)phosphazene]}; polyurethane and polyurethane copolymer containing polyether urethane; or cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate.
    [071] Polymer materials that can be particularly desirably used as the filter material of the present invention may be polyacrylonitrile (PAN), polyvinylidene fluoride (PVdF), polyester sulfone (PES) and polystyrene (PS), alone or as a a blend of polyvinylidene fluoride (PVdF) and polyacrylonitrile (PAN), a blend of PVdF and PES, or a blend of PVdF and thermoplastic polyurethane (TPU).
    [072] Referring again to Figures 1 to 3, each of the filter means 20 is formed so that the first nanofiber mat 24 and the second nanofiber mat 26 are respectively laminated on both surfaces of the non-woven fabric 22 , in which the other three lateral edges, except the upper surface of the non-woven fabric 22, are compressed by a thermal compression method so that the first nanofiber mat 24 and the second nanofiber mat 26 are formed to surround the side portion of the non-woven fabric 22, wherein the upper surface of the non-woven fabric 22 projects relative to the first nanofiber batt 24 and the second nanofiber batt 26, the protruding portion 32 of the non-woven fabric 22 is connected to a discharge tube 50 through which purified water through the non-woven fabric 22 is discharged.
    [073] Here, the discharge tube 50 includes: a fixation portion 52 that is secured to enclose the protruding portion 32 of the non-woven fabric 22 so that only the water that has passed through the non-woven fabric 22 can be discharged; and a connecting tube 54 which is connected to the fastening portion 52 and which is connected to an outlet 14 formed in the housing 10.
    [074] The bubble generating nozzles 30 arranged on the underside of the housing 10 are connected to a compressor (not shown) or the like through which air can be externally injected, and are arranged in plurality on the bottom surface of the accommodation 10.
    [075] Here, the bubble generating nozzles 30 serve to discharge air into the housing 10, to thereby generate bubbles and water flows and thus serve to remove an adhesion material adhered to the surfaces of the means of filter 20.
    [076] Any forms of nozzles capable of generating a flow of water and air bubbles are applicable to the structures of the bubble generating nozzles 30. In addition, a discharge passage (not shown) is formed in the bottom of the housing 10 at the which foreign substances accumulated in the bottom of the housing 10 by washing the filter means 20 are discharged through the discharge passage.
    [077] A method of manufacturing filter media according to an embodiment of the present invention will be described in detail below.
    [078] Figure 5 is a schematic diagram of an electrospinning apparatus that manufactures a filter medium according to an embodiment of the present invention.
    [079] Electrospinning apparatus according to an embodiment of the present invention includes: a first collector 110 along which a non-woven tissue 22 is transferred; first spinning nozzles 120 disposed on the upper surface of the first collector 110 and connected to a high voltage generator (not shown) to thereby form a first nanofiber mat 24 on a surface of the non-woven fabric 22; a second collector 130 along which the other surface of the non-woven fabric 22, on whose surface the first nanofiber mat 24 has been formed, is transferred to face up; and second spinning nozzles 140 disposed on the upper surface of the second collector 130 and connected to a high voltage generator (not shown) to thereby form a second nanofiber mat 26 on the other surface of the non-woven fabric. 22.
    [080]The first spinning nozzles 120 and the second spinning nozzles 140 serve to produce ultra-fine nanofiber yarns by electrospinning a spinning solution that is formed by mixing a polymer material and a solvent.
    [081] A roll of non-woven fabric 100 on which the non-woven fabric 22 is rolled-up is disposed on the front side of the first collector 110 and a roll of filter media 190 on which the filter means 20 is laminated with the first nanofiber mat 24 and the second nanofiber mat 26 are wrapped around the rear side of the second collector 130.
    [082] When a high voltage electrostatic force of 90 to 120 kV is applied between the first collector 110 and each of the first wiring nozzles 120 and between the second collector 130 and each of the second wiring nozzles 140 , 112 and 114 ultra-fine fiber filaments are spun to form an ultra-fine nanofiber mat.
    [083] Air spray devices 70 and 72 are provided in the first spinning nozzles 120 and the second spinning nozzles 140, respectively, and thus the fiber filaments spun from the first spinning nozzles 120 and the second spinning nozzles 140 are prevented from blowing without being caught by the first and second collectors 110 and 130.
    [084] The multi-orifice spun pack nozzles used in the present invention are produced to adjust the air pressure of the air spray to the outside in the range of about 0.1 to about 0.6 MPa. In this case, air pressure less than about 0.1 MPa does not contribute to capturing and integrating the loose fibers. In the case that the air pressure exceeds about 0.6 MPa, the cone of each spinning nozzle is hardened to thereby cause a needle clogging phenomenon to occur and to cause thereby , a wiring problem occurs.
    [085] In this way, a process of preparing the filter media through the use of the electrospinning device as constructed above will be described below.
    [086]First, when the first collector 110 is actuated, the non-woven fabric 22 wound on the roll of non-woven fabric 100 is moved along the upper surface of the first collector 110.
    [087] In addition, when a high-voltage electrostatic force is applied between the first collector 110 and each of the first spinning nozzles 120, a spinning solution of the first spinning nozzles 120 is produced in the ultra-fine fiber filaments 112 and spun on a surface of the non-woven fabric 22. In this way, the ultra-fine fiber filaments are accumulated on a surface of the non-woven fabric 22 and, in this way, the first nanofiber mat 24 having ultra-fine pores is formed.
    [088]Therefore, when the first nanofiber mat 24 is completely produced, a process of laminating the second nanofiber mat 26 on the other side of the non-woven fabric 22 is performed.
    [089] In other words, the non-woven fabric 22 on a surface on which the first nanofiber mat 24 is laminated is moved to the second collector 130. In this case, since the second collector 130 is disposed on the underside of the pr - first collector 110, the non-woven fabric 22 is moved to the second collector 130 in an inverted state of 180°. In this way, the other surface of the non-woven fabric 22 is facing upwards.
    [090] In addition, when a high-voltage electrostatic force is applied between the second collector 130 and each of the second spinning nozzles 140, a spinning solution of the second spinning nozzles 140 is produced on the ultra-fine fiber filaments. 114 and spun on the other surface of the non-woven fabric 22. Thereby, the ultra-fine fiber filaments are accumulated on the other surface of the non-woven fabric 22, and thus the first nanofiber mat 26 having ultra-fine pores is formed.
    [091] Filter media 20 prepared through these processes are pressurized to a predetermined thickness while passing through a thrust bearing 180 to thereby be wound onto a filter media roller 190.
    [092] In the present invention, in some embodiments, a method of manufacturing a filter medium is provided which comprises the steps of: preparing a non-woven fabric; electrospin a low-concentration polymer material blending solution containing an 8 to 10% by weight polymer material and a high-concentration polymer material blending solution containing a 15 to 17% polymer material , by weight, in sequence, onto a surface of the non-woven fabric, to thereby form a nanofiber mat; and electrospinning the low concentration polymer material blending solution containing the polymer material from 8 to 10% by weight, and the high concentration polymer material blending solution containing the polymer material from 15 to 17 % by weight in sequence on the other surface of the non-woven fabric to thereby form a nanofiber mat.
    [093] In addition, in some embodiments, a method of manufacturing a filter medium is also provided which comprises the steps of: preparing a non-woven fabric; electrospinning a polymer material onto a removable paper to form a nanofiber mat; and laminate the nanofiber mat on both surfaces of the non-woven fabric and heat the laminated result to a temperature higher than the melting point of the non-woven fabric and lower than the melting point of the nanofiber mat, thus melting , thermally the non-woven fabric and the nanofiber blanket.
    [094] In addition, according to another embodiment of the present invention, the filter medium can be prepared by adhering a non-woven fiber and a nanofiber mat through the use of a hot melt powder or a mat of hot melt.
    [095] In the present invention below, the operation of a filter apparatus formed from the filter means will be described.
    [096] When water flows into housing 10 for filtration, a pump 16 connected to outlet 14 is actuated to cause water to pass through filter means 20 to thereby be filtered and then discharged through outlet 14.
    [097] In addition, when a washing process of the filter means 20 is carried out to remove materials affixed to the surfaces of the filter means 20, the pump 16 is driven in the reverse direction to thereby cause the washing water introduced into housing 10 pass through outlet 14. Wash water may include chemicals needed to wash filter media.
    [098] In the present invention, the pump 16 is connected to the outlet 14, thus the housing 10, which performs the function of pumping water through the outlet 14 out of the housing 10 or supplying the washing water in the housing 10 through from exit 14.
    [099] When wash water is introduced into housing 10 through outlet 14, wash water introduced through non-woven fabric 22 is discharged through first nanofiber mat 24 and second nanofiber mat 26 to manufacture thereby, materials affixed to the first nanofiber mat 24 and to the second nanofiber mat 26 separate from it.
    [0100] In this way, the bubbles generated from the bubble generation nozzles 30 are supplied to the surfaces of the first nanofiber mat 24 and the second nanofiber mat 26 to, in this way, play a role of producing materials affixed to the first nanofiber mat 24 and the second nanofiber mat 26 separate from it. In other words, the bubble generating nozzles 30 are provided on one side of the housing 10 and serve to wash the filter means 20.
    [0101] Figure 6 is a partial sectional view illustrating a filter means according to an embodiment of the present invention. Figure 7 is an enlarged cross-sectional view of a nanofiber in a nanofiber mat in accordance with an embodiment of the present invention.
    [0102]The filter media described above has a structure in which a nanofiber mat is laminated to a non-woven fabric. The nanofiber mat can be implanted into a structure of a first nanofiber mat laminated to one surface of a non-woven fabric and a second nanofiber mat laminated to the other surface of the non-woven fabric or to a structure in which a nanofiber mat is laminated over the entire surface except for the upper surface of the non-woven fabric.
    [0103] In this case, the non-woven fabric and the nanofiber mat can be fused by means of thermal compression. The melting point of the nanofiber mat is designed to be less than the melting point of the non-woven fabric, so that the nanofiber mat is preferentially fused and fused to the non-woven fabric through the heat applied during thermal compression . For example, when the polymer material to form a nanofiber mat is applied as PVDF, the melting point of PVDF is 155 °C and thus the non-woven fabric includes a cellulose-based non-woven fabric, based on nylon or based on polyester which has a melting point greater than 155°C.
    [0104]Therefore, during thermal compression, the nanofiber mat region that comes in contact with the non-woven fabric is fused and fused into a non-woven fabric. In the present invention, since the pore size of the non-woven fabric is much larger than the pore size of the nanofiber mat, a portion of the fused nanofiber mat is penetrated into the pores of the non-woven fabric. Since, as shown in Figure 6, based on a boundary surface 29 between a non-woven fabric 28b and a nanofiber mat 28a before thermal compression, the molten nanofiber mat after thermal compression is spread in the distribution in the nanofiber mat direction (UM) and in the non-woven fabric direction (B), from the boundary surface 29. When an amount of the molten nanofiber mat is controlled based on this technical feature, the mat is Fused nanofiber enters the pores of the non-woven fabric. Consequently, the fused nanofiber mat that has entered the pores of the non-woven fabric plays a role of a locking function to thereby improve the adhesion between the nanofiber mat and the non-woven fabric.
    [0105]In some embodiments, a polymer material that forms the nanofiber mat includes a blend of polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN) in a ratio of 5:5 or 6:4. In this case, as shown in Figure 7, an electrotrophied nanofiber is formed to include a core 27a, produced from PAN and an outer skin 27b that surrounds the outer peripheral surface of the core 27a and produced from PVDF. The nanofibers in this structure are stacked to form a nanofiber blanket. When the nanofiber mat which is formed by laminating the nanofibers, each having the core structure 27a and the outer skin 27b and the non-woven fabric is thermally compressed, the PVDF of the outer skin 27b is fused and penetrated to be fused into the non-woven fabric.
    [0106] According to another embodiment of the present invention, a fusion reinforcing material (not shown) is interposed between the nanofiber mat and the non-woven fabric. The fusion reinforcing material can have good adhesion strength, respectively, with a nanofiber mat and a non-woven fabric. That is, since the nanofiber mat is fused on one surface of the fusion reinforcement material and the non-woven fabric is fused on the other side of the fusion reinforcement material, the nanofiber mat and the non-woven fabric are fused through the use of the fusion reinforcement material. As a result, a bond strength between the nanofiber mat and the non-woven fabric when using the fusion reinforcing material can be further increased compared to the case where the nanofiber mat and the non-woven fabric are fused through thermal compression. Therefore, such a filter media structure can remarkably reduce a delamination phenomenon between the nanofiber mat and the non-woven fabric that can occur during iteratively performing a filter function and a wash function in the filter apparatus. In this case, the fusion process can be the process of melting the nanofiber mat and the non-woven fabric respectively through thermal compression and thereby fusing the nanofiber mat and the non-woven fabric through the use of the material. fusion reinforcement.
    [0107]In addition, the fusion reinforcement material must include openings through which water can pass. These openings connect the pores of the nanofiber mat with the pores of the non-woven fabric so that water can smoothly pass between the nanofiber mat and the non-woven fabric. Furthermore, the fusion reinforcement material can be implanted with a material that has the ability to increase the strength of the filter medium.
    [0108]The melt reinforcing material may include a hot melt powder or a hot melt blanket.
    [0109] As described above, the present invention has been described in relation to particularly preferred embodiments. However, the present invention is not limited to the above embodiments and it is possible for an individual having a common skill in the art to make various modifications and variations without departing from the spirit of the present invention. Thus, the protective scope of the present invention is not defined within the detailed description thereof, but is defined by the claims to be described later and the spirit of the technique of the present invention. Industrial Applicability
    [0110] The present invention can be applied to a filter medium that employs a nanofiber mat that is prepared through electrospinning.
    权利要求:
    Claims (5)
    [0001]
    1. Filter apparatus CHARACTERIZED by the fact that it comprises: an accommodation having an inlet for supplying sewage or waste water to the accommodation and an outlet for discharging purified water from the accommodation; a plurality of filter means, the filter means being disposed at a predetermined interval within the housing and for filtering sewage or waste water stored in the housing, each of the plurality of filter means comprising: a porous substrate; a nanofiber mat laminated to both surfaces of the porous substrate, the nanofiber mat being formed from accumulated nanofibers made of a polymeric material and having several fine pores; and a fusion reinforcing material interposed between the nanofiber mat and the porous substrate for adhesion with the nanofiber mat and the entire porous substrate, and wherein the porous substrate is surrounded by the nanofiber mat, except for an upper edge of the substrate porous, the upper edge of the porous substrate protrudes relative to the nanofiber mat to form a protruding portion; an overflow tube disposed within the housing and connected to the outlet, the overflow tube including: an attachment portion surrounding and secured to the protruding portion of the porous substrate; and a connecting tube connected to the fixing portion and connected to the outlet, thus discharging purified water through the porous substrate through the discharge tube; and a pump connected to the outlet to pump purified water out of the housing.
    [0002]
    2. Filter apparatus according to claim 1, CHARACTERIZED by the fact that it further comprises a nozzle for generating bubbles, which is provided on one side of the housing and which washes the filter medium.
    [0003]
    3. Filter apparatus according to claim 1, CHARACTERIZED by the fact that the porous substrate is any one of a polyester-based non-woven fabric, a nylon-based non-woven fabric, a non-woven fabric a polyolefin-based and a cellulose-based non-woven fabric, and the polymer material comprising a polyvinylidene fluoride (PVdF).
    [0004]
    4. Filter apparatus according to claim 1, CHARACTERIZED by the fact that the polymer material is a mixture of PVdF and polyacrylonitrile (PAN) in a ratio of 5:5 or 6:4.
    [0005]
    5. Filter apparatus according to claim 1, CHARACTERIZED by the fact that the nanofiber mat comprises a first layer of nanofiber mat formed by a low concentration polymeric material and a second layer of nanofiber mat formed by a material high concentration polymeric.
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    同族专利:
    公开号 | 公开日
    US11084266B2|2021-08-10|
    KR20140103866A|2014-08-27|
    US20200094539A1|2020-03-26|
    CN104994928B|2017-10-27|
    US20150360157A1|2015-12-17|
    US20180319146A1|2018-11-08|
    US10525686B2|2020-01-07|
    KR101734120B1|2017-05-12|
    BR112015019842A2|2017-07-18|
    CN104994928A|2015-10-21|
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    法律状态:
    2018-02-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-29| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-17| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 18/02/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    KR20130016680|2013-02-18|
    KR10-2013-0016680|2013-02-18|
    PCT/KR2014/001295|WO2014126443A1|2013-02-18|2014-02-18|Filter medium, manufacturing method therefor, and filter equipment using same|
    KR1020140018237A|KR101734120B1|2013-02-18|2014-02-18|Filter Media and Method for manufacturing thereof, and Filter Apparatus using the Same|
    KR10-2014-0018237|2014-02-18|
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