US20160136584A1 - Filter medium for liquid filter and method for manufacturing same - Google Patents

Filter medium for liquid filter and method for manufacturing same Download PDF

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Publication number
US20160136584A1
US20160136584A1 US15/000,347 US201615000347A US2016136584A1 US 20160136584 A1 US20160136584 A1 US 20160136584A1 US 201615000347 A US201615000347 A US 201615000347A US 2016136584 A1 US2016136584 A1 US 2016136584A1
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Prior art keywords
nanofibers
nanofiber web
nonwoven fabric
filter medium
porous
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Abandoned
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US15/000,347
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English (en)
Inventor
Jun Sik Hwang
In Yong Seo
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Amogreentech Co Ltd
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Amogreentech Co Ltd
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Priority claimed from PCT/KR2014/006788 external-priority patent/WO2015020337A1/ko
Application filed by Amogreentech Co Ltd filed Critical Amogreentech Co Ltd
Assigned to AMOGREENTECH CO., LTD. reassignment AMOGREENTECH CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HWANG, JUN SIK, SEO, IN YONG
Publication of US20160136584A1 publication Critical patent/US20160136584A1/en
Priority to US16/284,382 priority Critical patent/US10682599B2/en
Abandoned legal-status Critical Current

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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/12—Composite membranes; Ultra-thin membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • B01D69/107—Organic support material
    • B01D69/1071—Woven, non-woven or net mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
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    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
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Definitions

  • the present invention relates to filter media for liquid filters and a method of manufacturing the same, and more particularly, to filter media for liquid filters and a method of manufacturing the same, in which a thin filter layer is formed and the content of nanofibers weighs light, by laminating a low weight nanofiber web on a porous nonwoven fabric, and thus a less differential pressure is applied before and after filtering, to thereby increase a pass flow rate.
  • the membrane is a substance having a selection capability that is present between two different materials.
  • the membrane means a substance which serves to selectively pass or to exclude a material. Structures and substances of the membrane, and conditions and principles of the movement of the materials passing through the membrane, have no limitations. When a substance is located between only two materials to isolate the two materials each other and the selective movement of the materials through the substance between the two materials occurs, the substance may be called a membrane.
  • the membranes are of a very variety of types and are classified into several criteria.
  • a classification by a separation operation is a classification method depending upon the state of a target material to be separated, and is classified into a liquid separation method, a gas-liquid separation method, a gas separation method, and so on.
  • the liquid separation method is classified into micro filtration, ultra filtration, nano filtration, reverse osmosis filtration, etc., in accordance with the size of an object for filtration.
  • the gas separation method is classified in detail in accordance with the type of gas to be separated.
  • the gas separation membrane is classified into an oxygen-enriched membrane for separating the oxygen gas, a nitrogen-enriched membrane for separating the nitrogen gas, a hydrogen-enriched membrane for separating the hydrogen gas, a dehumidifying film for removing humidity, etc.
  • 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.
  • the membrane is also classified into a plate-shaped type, a spiral wound type, a cartridge type, a flat membrane cell type, an immersion type, a tubular type, and so on, depending on the form of a filter module.
  • the membrane is classified according to a material and is classified into an inorganic film and an organic film using a polymer film.
  • the inorganic films expand their use based on the advantages of heat resistance, durability, etc., most currently commercialized products are occupied by the polymer membranes.
  • filtration means to remove two or more components from a fluid, that is, it means to separate non-dissolved particles (that is, solid) from the fluid.
  • Filtering mechanisms in the separation of the solid materials may be described as sieving, adsorption, dissolution, diffusion mechanisms. Except for some membranes such as gas separation membranes, reverse osmosis membranes, etc., it can be said that most of the filtering mechanisms depend entirely on the sieving mechanism.
  • Nonwoven fabrics nonwovens
  • woven fabrics wovens
  • meshes porous membranes and the like are typical filter media.
  • nonwovens, wovens, meshes, etc. are used as a pretreatment filter concept with a limitation to a particle filtration area.
  • porous membranes can make precise and small pores and have been used for a process requiring a wide range of filtration areas and the highest precision such as micro filtration, ultra filtration, nano filtration, reverse osmosis filtration, etc.
  • nonwovens, wovens, or meshes are made of fibers having a thickness from several micrometers to several hundreds of micrometers, it is difficult to make fine pores not more than 1 ⁇ m. In particular, it is not possible actually to create uniform pores since webs are formed by random arrangement of fibers in the case of the nonwoven fabrics.
  • the melt-blown nonwoven fabric may be called a nonwoven fabric made of a very fine fiber having a diameter of 1 ⁇ 5 ⁇ m.
  • the pore size before heat calendering is not less than six micrometers and the pore size after heat calendering is only three micrometers approximately.
  • the deviation in the average pore size occurs by ⁇ 15% or more around a reference point, and the melt-blown nonwoven fabric has a structure in which very large pores coexist. Accordingly, the nonwovens, wovens, or meshes have the difficulty in preventing the leakage of contaminated materials through relatively large pores and thus have low filter efficiency. Therefore, the filter media are used in an inaccurate filtration process or used as a pre-treatment concept of an accurate filtration process.
  • the porous membrane is prepared by a method such as a non-solvent induced phase separation (NIPS) process, a thermally induced phase separation (TIPS) process, a stretching process, a track etching process, a sol-gel process, etc.
  • the materials of most of the porous membranes are made of 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.
  • the conventional porous membranes may create pores of precise and small size, closed pores or blinded pores may be created inevitably in the manufacturing process.
  • the conventional porous membranes have problems such as a small flow amount of filtration, a high driving pressure, and a short filtration lift cycle, to thus cause high operating costs and frequent filter replacement.
  • Patent Document 1 discloses a filtering medium including at least one nanofiber layer of polymeric nanofibers having an average fiber diameter of less than about 1 ⁇ m, in which a mean flow pore size is about 0.5 ⁇ m to about 5.0 ⁇ m, and also that a solidity is about 15% by volume to about 90% by volume, and a water flow rate through the medium at a differential pressure of 10 psi (69 kPa) exceeds about 0.055 L/min/cm 2 .
  • Patent Document 1 discloses spinning nanofibers by an electro-blown spinning method or an electric blowing method by using a solution containing nylon of 24 wt % in a formic acid as a polymer solution, including at least one spinning beam comprising spinnerets, blowing gas injection nozzles and collectors, to thereby form webs.
  • the method of forming a fibrous web of nanofibers in the patent document 1 cannot be referred to a manufacturing technique that uses a multi-hole spinning pack.
  • a spinning solution containing a polymer of 24 wt % increases the viscosity and is solidified at the surface of the spinning solution, to thus make it difficult to spin for a long time, and increases the fiber diameter, to thus cause a problem that it is not possible to make the fibrous form of not more than a micrometer in size.
  • the ultrafine fiber web obtained by electrospinning does not go through a pretreatment process of appropriately adjusting the amount of the solvent and moisture remaining on the surface of the web before performing calendering, pores are increased but the strength of the web is weakened. Otherwise, in the case that evaporation of the solvent is performed too slowly, a phenomenon of melting the web may occur.
  • Patent Document 2 discloses a filter medium for a liquid filter, a method of manufacturing the same, and a liquid filter using the same, using an electrospun nanofiber web to have a multi-layer structured three-dimensional micro-porous structure to thereby have high efficiency and long lifetime and maximize filter efficiency.
  • the filter media made of a multi-layer nanofiber web for liquid filters are prepared by air-electrospinning a spinning solution on top of a support to thus form a nanofiber web, in which the spinning solution is obtained by dissolving a fiber forming polymer material in a solvent, thermo-compression bonding the support in which the nanofiber web has been formed, or air-electrospinning a spinning solution to thus form and thermo-compression bond a nanofiber web, to then laminate the support on one side of the thermo-compression bonded nanofiber web.
  • the process of thermo-compression bonding the support in which the nanofiber web has been formed after air-electrospinning the spinning solution on top of the support to thus form a nanofiber web in the method of preparing the filter media for liquid filters, may use a porous nonwoven fabric having a high tensile strength as the support, to thereby increase the tensile strength and have the benefit of increasing the ease of handling during the production but may cause a problem that uniformity of the nanofiber web is not high.
  • the electrospun nanofibers are integrated in a collector, that is, bring about an integration phenomenon, and laminated along a pattern of an integrated portion, that is, bring about a lamination phenomenon. For example, when electrospinning is executed on a diamond pattern, nanofibers starts to be integrated along a first diamond pattern.
  • Patent Document 2 was proposed filter media that are laminated with a nanofiber web by using a nonwoven fabric made of a fiber with a single core structure such as a melt-blown nonwoven fabric, a spun bond nonwoven fabric, and a thermal bond nonwoven fabric, but it is difficult to maintain a pore structure in any one of the nonwoven fabric and the nanofiber web since calendering is performed at a relatively lower melting point of melting points of the nonwoven fabric and the nanofiber web when the nonwoven fabric and the nanofiber web are laminated on each other.
  • a nonwoven fabric made of a fiber with a single core structure such as a melt-blown nonwoven fabric, a spun bond nonwoven fabric, and a thermal bond nonwoven fabric
  • the filter media in the case of making filter media by air-electrospinning a spinning solution to thus form nanofiber web, thermo-compression bonding the nanofiber web, and then laminating a support on one surface of the thermo-compression bonded nanofiber web or in the case of making filter media with only nanofibers by themselves, the filter media of a heavy weight of about 10 g/m 2 or more are required in order to handle the filter media.
  • the heavy-weight of the filter media is a factor directly connected with a production rate, to thus cause high costs.
  • nanofibers have a large amount of static electricity in a manufacturing process, and thus when the filter media include only nanofibers themselves, it is quite difficult to handle the filter media. It is not possible to remove the static electricity through a composition such as lamination, but it is possible to improve handling properties. Furthermore, although nanofibers may have good relative intensities as compared with the other fibers, the absolute strengths of nanofibers are prone to be weak.
  • a porous nanofiber web made of nanofibers may create a rigid coupling between the fibers through a calendering process, to thus create a highly matured porous nanofiber web.
  • the melting point of the nonwoven fabric is lower than an inter-fiber bonding temperature of the nanofibers made of a polymer, to accordingly limit a calendering temperature control.
  • a rigid coupling between the nanofibers to form the nanofiber web cannot be made.
  • hydrophilicity is required in the liquid filtration.
  • hydrophilic polymer is weak in the mechanical strength and the chemical resistance as compared to the hydrophobic polymer and thus should be used limitedly.
  • the filter media made of a PVdF polymer have a very suitable strength and chemical resistance to liquid filtration, but there is a problem that the filter media are limitedly used in aqueous filtration because of the hydrophobic property.
  • the filter media made of a hydrophobic polymer are made of a heavy weight of about 10 g/m 2 or more so as to be handled in the manufacture process, a relatively high differential pressure is applied across the filter media when an aqueous fluid passes through the filter media. Accordingly, in the case that the hydrophilic treatment is performed or not, there is a problem that water does not pass through the filter media well if an appropriate force is not applied across the filter media.
  • methods of treating water pollutants may include a co-precipitation method of using a waste water treatment coagulant, a flotation method according to a specific gravity difference, a bioaccumulation method, an ion exchange adsorption method, etc.
  • the ion exchange adsorption method has been known as the most effective method from among them.
  • a filter medium for liquid filters and a method of manufacturing the same, in which a light weight nanofiber web is laminated on a porous nonwoven fabric to thereby form a thin filter layer and make the content of nanofibers per unit area into a light weight to thus apply a less differential pressure across the filter medium before and after filtration to increase a pass flow rate and as a result a membrane with excellent air permeability and excellent water permeability can be prepared even if the hydrophilic treatment may not be performed by using a nanofiber web made of light weight nanofibers even with the use of a hydrophobic PVdF polymer.
  • a filter medium for liquid filters comprising: a porous support that plays a strength support role; and a nanofiber web that is laminated on one side of the porous support and is made of nanofibers of a polymer material, in which the nanofiber web comprises fine pores of a three-dimensional structure, through which a liquid to be treated passes, wherein content of the nanofibers is less than 5 gsm.
  • the content of the nanofibers is less than 5 gsm, air permeability and water permeability are ensured even though the nanofiber web is made by laminating hydrophobic nanofibers, to thus obtain an excellent pass flow rate, but when the content of the nanofibers exceeds 5 gsm, a filter layer becomes thick to thereby cause a phenomenon that a more differential pressure is applied and a pass flow rate is reduced.
  • the content of the nanofibers is set to range from 2 to 3 gsm.
  • thickness of the nanofiber web is set to range from 2 to 6 ⁇ m, and a pore size thereof is set to 0.2 to 3 ⁇ m.
  • diameter of the nanofibers is set to range from 100 to 800 nm, and more preferably diameter of the nanofibers is set to range from 150 to 300 nm.
  • the porous support is a nonwoven fabric, in which the nonwoven fabric is made of a PP/PE nonwoven fabric in which PE is coated on an outer periphery of a PP fiber as a core, or a PET (polyethyleneterephthalate) nonwoven fabric in which low melting point PET is coated on an outer periphery of a regular PET fiber as a core.
  • the nonwoven fabric is made of a PP/PE nonwoven fabric in which PE is coated on an outer periphery of a PP fiber as a core, or a PET (polyethyleneterephthalate) nonwoven fabric in which low melting point PET is coated on an outer periphery of a regular PET fiber as a core.
  • the PP/PE nonwoven fabric is combined with the nanofibers by melting a PE coating portion coated on an outside of the PP fiber, and the PP fiber maintains a porous structure.
  • the PET nonwoven fabric is combined with the nanofibers by melting the low melting point PET coated on the outer periphery of the regular PET fiber, and the regular PET fiber maintains a porous structure.
  • the nanofibers are configured so that ion exchange resin particles are dispersed inside or on the surfaces of the nanofibers, and the ion exchange resin particles are particles of a porous organic polymer with an ion exchange capacity or particles of a copolymer of polystyrene and divinylbenzene.
  • the nanofibers are configured so that the Ag metal salts are dispersed inside or on the surfaces of the nanofibers.
  • a method of manufacturing a filter medium of liquid filters comprising: electrospinning a spinning solution that is formed by mixing a polymer material with a solvent on a transfer sheet, thereby forming a nanofiber web having fine pores of a three-dimensional structure; performing a primary calendering process of combining the nanofibers and simultaneously adjusting pore sizes and thicknesses of the nanofiber web; and performing a secondary calendering process of laminating the nanofiber web having undergone the primary calendaring process on a porous support to thus form the filter medium.
  • the primary calendering process is performed at a higher temperature than that of the secondary calendering process.
  • the primary calendering process is set at a temperature capable of combining the nanofibers to form a nanofiber web
  • the secondary calendering process is set at a temperature identical to a melting point of a coating portion having the melting point lower than that of a core of a double core fiber forming a porous support, in which the coating portion is melted and combined with the nanofibers.
  • the spinning solution further comprises ion exchange resin particles or Ag metal salts, in which the nanofibers are configured so that the ion exchange resin particles or the Ag metal salts are dispersed inside or on the surfaces of the nanofibers.
  • the transfer sheet is any one of paper, a nonwoven fabric made of a polymeric material that is not dissolved by the solvent contained in the spinning solution, and a polyolefin-based film.
  • the present invention provides a filter medium for liquid filters and a method of manufacturing the same, in which a light weight nanofiber web is laminated on a porous nonwoven fabric to thereby form a thin filter layer and make the content of nanofibers per unit area into a light weight to thus apply a less differential pressure across the filter medium before and after filtration to increase a pass flow rate and as a result a membrane with excellent air permeability and excellent water permeability can be prepared even if the hydrophilic treatment may not be performed by using a nanofiber web made of light weight nanofibers even with the use of a hydrophobic PVdF polymer.
  • the present invention uses a transfer method of spinning nanofibers on a transfer sheet such as paper and laminating the nanofiber spun transfer sheet on a porous nonwoven fabric, to thus obtain a nanofiber web having excellent uniformity in view of a pore size, permeability, thickness, weight, and so on of the nanofiber web.
  • the present invention uses a transfer method of spinning nanofibers on a transfer sheet such as paper and laminating the nanofiber spun transfer sheet on a porous nonwoven fabric, and thus executes a calendaring process at a temperature above a melting point of the nonwoven fabric before a laminating process to thereby create a rigid coupling between the nanofibers.
  • the present invention uses a transfer method of spinning nanofibers on a transfer sheet such as paper and laminating the nanofiber spun transfer sheet on a porous nonwoven fabric, to thus absorb a residual solvent contained in a nanofiber web to thereby prevent a re-melting phenomenon that the nanofibers are melted again in the residual solvent and to also properly adjust the amount of the residual solvent.
  • the present invention uses a porous nonwoven fabric that can be used as a support and available at a lower cost in which a tensile strength can be increased, to thereby increase the handleability during production and greatly reduce a manufacturing cost by laminating a thin film porous nanofiber web on the porous nonwoven fabric.
  • the present invention uses a porous support made of fibers of a double core structure and having respectively different melting points, to thus execute a calendaring process at a melting point of a low melting point coating portion that surrounds a high melting point core when executing the calendaring process in order to laminate a porous support on a nanofiber web, to thereby enable the porous support to maintain a pore structure a high melting point core fiber.
  • the low melting point coating portion of the porous support is combined with (bonded with) nanofibers of a nanofiber web to thereby increase a coupling force.
  • the present invention can filter particular ions of a chemical substance contained in a liquid to be treated by ion exchange resin particles dispersed inside or outside nanofibers of a nanofiber web.
  • the present invention can purify quality of a liquid to be treated by Ag nanoparticles distributed inside or on the surfaces of nanofibers of a nanofiber web, and eradicate a variety of pathogens that are present in a filter medium.
  • FIG. 1 is a cross-sectional view of a filter medium for liquid filters according to a preferred embodiment of the present invention.
  • FIG. 2 is a flowchart view showing a manufacturing process of a liquid filter according to a preferred embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing an apparatus for manufacturing filter media shown in FIG. 1 .
  • FIG. 4 is a schematic diagram showing a roll-type liquid filter according to a preferred embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of a multilayer-type liquid filter according to a preferred embodiment of the present invention.
  • FIG. 6 is a graph showing pore size distributions of Example 1 according to the present invention and Comparative Examples 1 to 3.
  • filter media for liquid filters and a method of manufacturing the same embodiments of the present invention will be described with reference to the accompanying drawings.
  • the sizes and shapes of components illustrated in the drawings may be shown exaggerated for convenience and clarity of explanation.
  • the specifically defined terms may be changed according to user's or operator's intention, or the custom. Definitions of these terms herein need to be made based on the contents across the whole application.
  • the electrospun nanofibers are collected on a collector and are laminated along a pattern of the collector. For example, when the nanofibers are electrospun on a diamond pattern, the nanofibers start to be collected along the initial diamond pattern.
  • paper is more suitable than a nonwoven fabric.
  • the present invention uses a transfer method of spinning nanofibers on a transfer sheet such as paper and laminating the nanofiber spun transfer sheet on a porous nonwoven fabric, to thus make a nanofiber web having good uniformity such as a pore size, permeability, thickness, and weight.
  • the porous nanofiber web made of nanofibers may create a rigid coupling between the fibers through a calendering process, to thus create a highly matured porous nanofiber web.
  • a calendering temperature control is limited due to the melting point of the nonwoven fabric.
  • a bonding temperature between nanofibers, for example, PVdF fibers is about 150° C., but a melting point of the nonwoven fabric is in the range of 110 ⁇ 130° C.
  • the present invention prepares filter media by using the transfer method of forming a nanofiber web and then laminating the nanofiber web on a porous nonwoven fabric.
  • a primary calendering process is executed for the nanofiber web that is obtained by spinning nanofibers on the transfer sheet such as paper, at a temperature higher than the melting point of the nonwoven fabric, preferably at an inter-fiber bonding in temperature of the nanofibers, to thereby achieve a rigid coupling between the nanofibers. Then, the nanofiber web having undergone the primary calendering is laminated on a porous nonwoven fabric by a secondary calendaring process whose temperature is set to a melting point of the nonwoven fabric.
  • the primary calendering temperature is a temperature at which nanofibers to form a nanofiber web can be combined, for example, is set to 150 to 200° C.
  • the secondary calendering temperature is preferably set to 110 ⁇ 130° C. that is the melting point of a coating portion coated on an outside of a core in a PP/PE nonwoven fabric made of PP/PE fibers of a double core structure, for example, PE.
  • the PE coating portion coated on the outside of the core in the PP/PE nonwoven fabric is melted and laminated with the nanofiber web and a PP core maintains its shape to thus maintain a porous structure.
  • a transfer sheet having a high tensile strength is continuously fed to the top of a collector of an electrospinning device from a transfer roll in order to improve operability of the primary and secondary calendering processes, to thereby form a laminated porous nanofiber web on top of the transfer sheet.
  • the transfer sheet may employ, for example, paper, a nonwoven fabric made of a polymer material that is not made soluble by a solvent contained in a mixed spinning solution during spinning the mixed spinning solution, or a polyolefin-based film such as PE or PP.
  • the transfer sheet is made of only the porous nanofiber web itself, the transfer sheet has a low tensile strength, and thus it is difficult to execute a drying process, a calendaring process and a winding process while the transfer sheet is fed at a high feed rate.
  • the present invention uses a transfer method of spinning nanofibers on a transfer sheet such as paper and laminating the nanofiber spun transfer sheet on a porous nonwoven fabric, to thus absorb a residual solvent contained in a nanofiber web to thereby prevent a re-melting phenomenon that the nanofibers are melted again in the residual solvent and to also properly adjust the amount of the residual solvent.
  • a light weight porous nanofiber web is laminated on a porous nonwoven fabric to thereby form a thin filter layer to thus apply a less differential pressure across the filter medium to thus increase a pass flow rate.
  • an accumulated amount of nanofibers is set to less than 5 gsm, preferably in a range of 2 to 3 gsm. Accordingly, a membrane with excellent air permeability and excellent water permeability can be prepared even if the hydrophilic treatment may not be performed by using a nanofiber web made of light weight nanofibers even with the use of a hydrophobic PVdF polymer.
  • a spinning solution that is obtained by mixing a polymer material, ion exchange resin particles and a solvent is electrospun to one side of the transfer sheet to thus form a nanofiber web in which ion exchange resin particles are dispersed inside or outside the nanofibers. Accordingly, a surface filtration and a depth filtration of a liquid can be performed with the nanofiber web having fine pores of a three-dimensional network structure, and particular ions of a chemical substance contained in the liquid to be treated can be filtered by ion exchange resin particles dispersed inside or outside nanofibers of the nanofiber web.
  • a predetermined amount of Ag metal salt are added when forming the aforementioned spinning solution, and then the spinning solution with the Ag metal salt is spun, to thus rigidly fix Ag nanoparticles inside or on the surfaces of the nanofibers of the nanofiber web and uniformly dispersing the Ag nanoparticles to thereby eradicate a variety of pathogenic bacteria in the presence of the filter medium by the Ag nanoparticles having an antimicrobial function.
  • the Ag metal salt can employs one or more selected from the group consisting of silver nitrate is (AgNO 3 ), silver chloride (AgCl), and silver sulfide (Ag 2 S).
  • a nanofiber web that is formed by collecting nanofibers by electrospinning has a high porosity structure than a porous support such as a nonwoven fabric.
  • a liquid filter that is manufactured by using a filter media in accordance with the present invention is configured into a filter structure by laminating a filter medium of a two-layer structure in which a nanofiber web having a relatively high porosity and a porous support having a relatively low porosity are stacked over one another into a multi-layer structure, or winding the filter medium of the two-layer structure in a roll type, a liquid to be treated is filtered while passing through the nanofiber web of a light weight structure and having a relatively high porosity, thereby ensuring a good air permeability and a good water permeability while improving filtering efficiency.
  • the nonwoven fabric that can be used as the porous support can be made of a PP/PE nonwoven fabric in which PE is coated on an outer periphery of a PP fiber as a core, or a PET (polyethyleneterephthalate) nonwoven fabric in which low melting point PET is coated on an outer periphery of a regular PET fiber as a core.
  • the nonwoven fabric of the double structure maintains the pore structure since the PP fiber or the regular PET fiber that forms a core is able to maintain its shape when the calendering temperature is set according to the melting point of PE or the low melting temperature of PET at the time of laminating the nanofiber web with the nonwoven fabric.
  • the PE coating portion and the low melting point PET is melted and combined with the nanofibers during calendaring, to thus increase a bonding force between the nonwoven fabric and the nanofiber web.
  • the present invention uses the porous support made of fibers of the double core structure having two respectively different melting points, to thus keep the pore structure of the porous support while increasing the bonding strength between the porous support and the nanofiber web.
  • the present invention may use a porous support made of fibers that is available at low cost, and that may increase the handling properties due to the high tensile strength during the production of filter media, in which the fibers have a double core structure with two respectively different melting points, as other nonwoven fabric.
  • the polymer material used for the embodiments of the present invention may include, for example, hydrophilic polymers or/and hydrophobic polymers that can be electrospun, or may include one kind of the polymers or a mixture of two or more kinds of the polymers.
  • the hydrophilic properties may be required in the liquid filtration, but when considering the hydrophilic polymer has a weak mechanical strength and a weak chemical resistance as compared to the hydrophobic polymer, a mixture of the hydrophilic polymer and the hydrophobic polymer may be used to supplement the disadvantages of each of the hydrophilic polymer and the hydrophobic polymer and utilize the advantages thereof.
  • the filter media made of light weight of less than 5 gsm are manufactured and set to a low differential pressure, and thus may have a good water permeability by imposing an appropriate driving force even when hydrophilic treatment has not been performed.
  • the polymer materials used in the embodiments of the present invention may be resins that may be dissolved in an organic solvent for electrospinning, and that may be capable of forming nanofibers by electrospinning, but are not specifically limited thereto.
  • the polymer materials used in the present invention may be: polyvinylidene fluoride (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), a perfluoropolymer, polyvinyl chloride, polyvinylidene chloride, or a copolymer thereof; a polyethylene glycol derivative containing polyethylene glycol dialkylether and polyethylene glycol dialkylester; poly(oxymethylene-oligo-oxyethylene); polyoxide containing polyethylene oxide and polypropylene oxide; polyvinyl acetate, poly(vinyl pyrrolidone-vinyl acetate), polystyrene, and a polystyrene acrylonitrile copolymer; a poly
  • the polymer material used in the present invention may 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, polydifenoxiphosphazene, poly ⁇ bis[2-(2-methoxyethoxy)phosphazene] ⁇ ; polyurethane, and polyurethane copolymer containing polyether urethane; or cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate.
  • aromatic polyester such as polyamide, polyimide, polyamideimide, poly(meta-phenylene isophthal amide), polyester sulfone (PES), polyether ketone, polyetherimide (PEI), polyethylene terephthalate
  • the polymer materials that may 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 a mixture of polyvinylidene fluoride (PVdF) and polyacrylonitrile (PAN), a mixture of PVdF and PES, or a mixture of PVdF and thermoplastic polyurethane (TPU).
  • PAN polyacrylonitrile
  • PVdF polyvinylidene fluoride
  • PET polyester sulfone
  • PS polystyrene
  • TPU thermoplastic polyurethane
  • the polymer that can be used in the present invention is not particularly limited to a thermoplastic polymer and a thermoset polymer that can be electrospun.
  • a single-component solvent for example, dimethylformamide (DMF)
  • DMF dimethylformamide
  • a 2-component solvent that is used in the spinning solution
  • BP relatively high boiling point
  • BP solvent with a relatively low boiling point
  • a high boiling point solvent and a low boiling solvent are mixed at a weight ratio of about 7:3 to about 9:1.
  • the ion exchange resin can employ a positive ion exchange resin or a negative ion exchange resin.
  • the ion exchange resin particles in the present invention may be defined as having a functional group which has an ion exchange capacity on the internal surface thereof, and include a positive ion exchange resin, a negative ion exchange resin, or a positive/negative exchange resin in accordance with exchanged ions.
  • the present invention creates a spinning solution by making a porous organic polymer having an ion exchange capacity or PSDVB (Polystyrene Divinylbenzene) that is a copolymer of polystyrene and divinylbenzene into particles, and mixing the particles with a solvent.
  • PSDVB Polystyrene Divinylbenzene
  • FIG. 1 is a cross-sectional view of a filter medium for liquid filters according to a preferred embodiment of the present invention.
  • FIG. 2 is a flowchart view showing a manufacturing process of a liquid filter according to a preferred embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing an apparatus for manufacturing filter media shown in FIG. 1 .
  • a filter medium 10 for a liquid filter is configured so that a porous support 11 such as nonwoven fabric is laminated on one surface of a porous nanofiber web 13 .
  • the nanofiber web 13 is configured so that ion exchange resin particles 15 and Ag nanoparticles 17 are dispersed inside or on the surfaces of nanofibers 25 collected by electrospinning a mixed spinning liquid that is obtained by mixing a polymer material, ion-exchange resin particles, and a solvent, and is configured to include fine pores of a three-dimensional network structure to thus perform surface filtration and depth filtration of a liquid and simultaneously filter certain ions of a chemical substance contained in the liquid.
  • the nanofiber web 13 produced by the electrospinning method is separately prepared preferably by using a transfer sheet, and then is laminated with the porous support 11 to thus form a filter medium 10 .
  • the filter medium 10 of the two-layer structure is rolled to thus form a roll type liquid filter 100 as shown in FIG. 4 , or form a laminate type liquid filter 100 a that is stacked in a multi-layer structure through a bending process for increasing a specific surface area, as shown in FIG. 5 .
  • water to be treated (A) is filtered while mainly passing through the nanofiber web 13 having a high porosity instead of the porous support 11 having a low porosity, to thereby obtain the purified water (B) from an outlet of the filter 100 , and block a problem that the water to be treated (A) is concentrated and pressed locally.
  • the diameter of each of the nanofibers constituting the porous nanofiber web 13 is set to 100 to 800 nm, preferably 150 to 300 nm.
  • the thickness of the nanofiber web is set to 2-6 ⁇ m, and the pore size of the nanofiber web is preferably set to be in a range of 0.2 to 3 ⁇ m.
  • the accumulated amount of nanofibers is set to less than 5 gsm so that a low weight is made, preferably set to range from 2 to 3 gsm.
  • the average diameter of the fibers constituting the porous nanofiber web 13 has a very large effect on the pore size and pore size distribution.
  • the smaller the diameter of each of the nanofibers the average pore size and the maximum pore size decrease.
  • the smaller the diameter of each of the nanofibers the density of the nanofibers increase. Accordingly, the basis weight and the average thickness also increase, and air permeability decreases. However, it is possible to filter the finer pollutants, to thus increase a filtering effect.
  • liquid filter including the filter medium according to the embodiment of the present invention consumes less energy and has a long life due to the low differential pressure of the filter before and after the filtering process.
  • a transfer sheet 20 such as paper is supplied from an unwinder on which the transfer sheet 20 has been wound, to the top of a collector 23 of an electrospinning apparatus 21 .
  • a spinning solution is prepared by mixing a polymer material, ion exchange resin particles, a metal salt and a solvent, and then electrospun on the transfer sheet 20 , thereby forming a nanofiber web 13 (S 11 ).
  • a spinning method that may be used to manufacture a nanofiber web according to the present invention may employ any one selected from general electrospinning, electrospray, electrobrown spinning, centrifugal electrospinning, and flash-electrospinning, in addition to air-electrospinning (AES).
  • AES air-electrospinning
  • the ion exchange resin particles are dispersed inside or on or the surfaces of the nanofibers 25 of the nanofiber web 13 , and some of the ion exchange resin particles 15 of all the ion exchange resin particles are exposed to the surfaces of the nanofibers, to thus be involved to filter specific ions contained in the water to be treated (A). Further, the Ag nanoparticles 17 that are derived from the metal salt are stably and uniformly dispersed inside or on the surfaces of the nanofibers 25 .
  • a process of adjusting the amount of the residual solvent and moisture remaining on the surface of the porous nanofiber web 13 may be undergone (S 12 ) while the porous nanofiber web 13 passes through a pre-air dry zone by a pre-heater 27 . Then, a calendaring process is undergone.
  • the porous nanofiber web 13 is controlled so as to be prevented from being bulky.
  • the air blow of the fan plays a role of increasing strength of the film and controlling porosity of the film.
  • the porous nanofiber web 13 may be a low weight porous nanofiber web 13 directly formed on the porous support 11 by the input of the porous support 11 such as a nonwoven fabric to the collector 23 of the electrospinning apparatus 21 instead of the transfer sheet 20 .
  • the resulting porous nanofiber web is formed by calendering at a temperature below the melting point of the polymer in a primary calendering unit 31 (S 13 ).
  • An inter-fiber bonding temperature of nanofibers for example, PVdF fibers is 150° C., and PAN is 160° C., PES is 200° C., and the melting point of the nonwoven fabric (PE) is 110 ⁇ 130° C.
  • the porous nanofiber web 13 made of nanofibers creates a rigid coupling between the fibers through the primary calendering process thereby creating a highly matured porous nanofiber web.
  • the primary calendering process is done, a coupling is made between the nanofibers to thus control the pore sizes of three-dimensional pores and thickness of the nanofiber web formed by the collection of a large number of the nanofibers 25 .
  • any one method selected from the group consisting of pressing, rolling, thermal bonding and ultrasonic bonding may be performed for a combination of the nanofiber web and the nonwoven fabric, in addition to calendaring that laminates the nanofiber web with the nonwoven web to then perform a hot pressing bond.
  • the porous nanofiber web 13 obtained after having carried out the calendering process as required preferably undergoes a process of removing the residual solvent or water by using a secondary hot air dryer 29 at a temperature of 100° C. and with a velocity 20 msec (S 14 ), and is wound on a winder as a take-up roll of the porous nanofiber web 13 in a state in which the transfer sheet 20 is disposed on the inner side of the porous nanofiber web 13 .
  • the two-layer laminate of the porous nanofiber web 13 and the transfer sheet 20 wound around the winder undergoes a lamination process with the porous support 11 such as the nonwoven fabric in a secondary calendering unit 33 (S 15 ).
  • the porous support 11 when supplying the porous support 11 that has not been pre-heated for the secondary calendaring unit 33 , a problem of lowering the set temperature of the roll of the secondary calendering unit 33 by approximately 10-15° C. may occur.
  • the porous support 11 is preheated to a slightly lower temperature than the secondary calendering temperature, for example, 80° C., by using a heating roll or an infrared (IR) lamp (not shown), calendering, for example, after the second It is supplied to the calendering apparatus 33 , and then is supplied to the secondary calendering unit 33 .
  • IR infrared
  • the temperature of the secondary calendering unit 33 is set to 110 ⁇ 130° C. which can melt a PE film layer when using a PP/PE nonwoven fabric of a PE-coated double structure on the outer periphery of a PP fiber.
  • the porous support 11 is laminated with the porous nanofiber web 13 in the secondary calendering unit 33 (S 15 ), and then the transfer sheet 20 is peeled off and removed from the laminated filter medium 10 at the rear end of the secondary calendering unit 33 .
  • the present invention uses a transfer method of spinning nanofibers on a transfer sheet 20 such as paper and laminating the nanofiber spun transfer sheet on a porous nonwoven fabric, and thus executes a calendaring process at a temperature above a melting point of the nonwoven fabric before a laminating process to thereby create a rigid coupling between the nanofibers.
  • the filter medium 10 of the laminated structure of the nanofiber web 13 and the porous support 11 has a continuously repeated structure from the center of the rolled chemical filter medium (that is a roll axis) to the direction of the outer peripheral surface of the rolled chemical filter medium, or has a repeatedly laminated structure of the filter media 10 and 10 a of the laminated structure of the nanofiber web 13 and the porous support 11 as shown in FIG. 5 , to thereby implement a lamination type liquid filter 100 a.
  • the spinning solution was moved to a mixing tank of an electrospinning apparatus to set a voltage applied to the electrospinning apparatus to 100 kV, a distance from a spinning nozzle and a collector to 20 cm, a discharge amount per minute to 20 ⁇ l/hole, and was electrospun under a spinning atmosphere of 30° C. and a relative humidity of 60%, to have prepared a nanofiber web of a weight of 3 gsm with a pore size of 1 ⁇ m.
  • the thus-obtained nanofiber web was calendered under the condition of 150° C. and 1 Kgf/cm 2 thereby have formed a bond between the nanofibers and thus have implemented a fixed pore structure, and the calendered nanofiber web was laminated with a nonwoven fabric under the condition of 130° C. and 1 Kgf/cm 2 to have produced a filter medium.
  • the nonwoven fabric used in this Example 1 was a nonwoven fabric to be produced in Namyang Nonwoven Fabric Co., Ltd., and used a polyolefin material of thickness 160 ⁇ m and 40 gsm.
  • a PVdF membrane of a pore size of 1 ⁇ m made in a phase transition manner of Merck-Millipore (Comparative Example 1), a Micro PES membrane of a pore size of 1 ⁇ m made in a phase transition manner of Membrana Inc., (Comparative Example 2), and melt-blown media of a pore size of 1 ⁇ m made by H & V (Hollingsworth & Vose Company) (Comparative Example 3) were used as control groups
  • the filter medium of Example 1 according to the present invention appeared to have an average pore size of 1.0 ⁇ m, and the maximum pore size of 1.3 ⁇ m and appeared to have a narrow pore size distribution over the same level as those of commercially available filter membranes of Comparative Examples 1 to 3.
  • Example 1 (Nanofibers 1 ⁇ m) 2.5 Comparative Example 1 0.8 (PVdF Membrane 1 ⁇ m) Comparative Example 2 1.1 (PES Membrane 1 ⁇ m) Comparative Example 3 0.7 (Melt-blown 1 ⁇ m)
  • Example 2 As shown in Table 2, the filter medium of Example 1 according to the present invention was measured as the air permeability of 2.5 cfm@125 Pa, and appeared to have a very high air permeability compared to the commercially available filter membranes of Comparative Examples 1-3.
  • Example 1 (Nanofibers 1 ⁇ m) 0.8 Comparative Example 1 2.1 (PVdF Membrane 1 ⁇ m) Comparative Example 2 1.7 (PES Membrane 1 ⁇ m) Comparative Example 3 6.2 (Melt-blown 1 ⁇ m)
  • the filter medium of Example 1 according to the present invention was measured as the pressure drop of 0.8 psid @ 31 pm, 4.9 cm 2 , and appeared to have a very high water permeability as compared to the commercially available filter membranes of Comparative Examples 1-3.
  • filtrations were performed according to ASTM F795 standard, turbidities for the filtered liquids were measured, and the results were shown in Table 4.
  • the test particles (Dust) were used as ISO 12103-1, A2 fine.
  • Example 1 As shown in Table 4, the filter medium of Example 1 according to the present invention was measured as the turbidity of 0.4 NTU, and appeared to have very excellent turbidity removal efficiency as compared to commercially available filter membranes of Comparative Examples 1 to 3.
  • the spinning solution was moved to a mixing tank of an electrospinning apparatus to set a voltage applied to the electrospinning apparatus to 100 kV, a distance from a spinning nozzle and a collector to 20 cm, a discharge amount per minute to 20 ⁇ l/hole, and was electrospun under a spinning atmosphere of 30° C. and a relative humidity of 60%, to have prepared a nanofiber web of a weight of 3 gsm with a pore size of 0.45 ⁇ m.
  • the thus-obtained nanofiber web was calendered under the condition of 150° C. and 1 Kgf/cm 2 thereby have formed a bond between the nanofibers and thus have implemented a fixed pore structure, and the calendered nanofiber web was laminated with a nonwoven fabric under the condition of 130° C. and 1 Kgf/cm 2 to have produced a filter medium.
  • the nonwoven fabric used in this Example 2 was the same as that of Example 1.
  • the filter medium of Example 2 according to the present invention appeared to have an average pore size of 0.39 ⁇ m, and the maximum pore size of 0.59 ⁇ m and appeared to have a narrow pore size distribution over the same level as those of commercially available filter membranes of Comparative Examples 4 and 5.
  • Example 2 (Nanofibers 0.45 ⁇ m) 1.48 Comparative Example 4 0.31 (PVdF Membrane 0.45 ⁇ m) Comparative Example 5 0.34 (PES Membrane 0.45 ⁇ m)
  • Example 6 As shown in Table 6, the filter medium of Example 2 according to the present invention was measured as the air permeability of 1.48 cfm@125 Pa, and appeared to have a very high air permeability compared to the commercially available filter membranes of Comparative Examples 4 and 5.
  • Example 2 (Nanofibers 0.45 ⁇ m) 3.8 Comparative Example 4 6.2 (PVdF Membrane 0.45 ⁇ m) Comparative Example 5 5.1 (PES Membrane 0.45 ⁇ m)
  • Example 7 As shown in Table 7, the filter medium of Example 2 according to the present invention was measured as the pressure drop of 3.8 psid @ 31 pm, 4.9 cm 2 , and appeared to have a very high water permeability as compared to the commercially available filter membranes of Comparative Examples 4 and 5.
  • Example 2 By using self-made equipment for the filter media of Example 2 and Comparative Examples 4 and 5, filtration was performed according to ASTM F795 standard, turbidities for the filtered liquids were measured, and the results were shown in Table 4.
  • the test particles (Dust) were used as ISO 12103-1, A2 fine.
  • Example 2 As shown in Table 8, the filter medium of Example 2 according to the present invention was measured as the turbidity of 0.1 NTU or less, and appeared to have the same turbidity removal efficiency as compared to commercially available filter membranes of Comparative Examples 4 and 5.
  • a surface filtration and a depth filtration of water to be treated can be performed with a nanofiber web having fine pores of a three-dimensional network structure.
  • the ion exchange resin particles exposed to the nanofibers of the nanofiber web filter specific ions of a chemical substance contained in the water to be treated, to thus improve the filtering efficiency, and to remove a variety of pathogens such as bacteria and E. coli multiplied in the filter media by an antimicrobial activity of Ag nanoparticles.
  • the present invention may be applied to filter media for liquid filters in which a thin filter layer is formed and the content of nanofibers weighs light, by laminating a low weight nanofiber web on a porous nonwoven fabric, and thus a less differential pressure is applied before and after filtering, to thereby increase a pass flow rate.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Dispersion Chemistry (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106492653A (zh) * 2016-09-19 2017-03-15 江苏海纳空调净化设备有限公司 一种用于空调的过滤网
US9623352B2 (en) 2010-08-10 2017-04-18 Emd Millipore Corporation Method for retrovirus removal
US9750829B2 (en) 2009-03-19 2017-09-05 Emd Millipore Corporation Removal of microorganisms from fluid samples using nanofiber filtration media
WO2017213593A3 (en) * 2016-06-10 2018-03-01 National Science And Technology Development Agency Gleanable and sunlight-tolerant multifunctional nanofibrous filter for water and air filtration and fabrication process of nanofibrous filter thereof
US20180147533A1 (en) * 2015-06-01 2018-05-31 Amogreentech Co., Ltd. Adsorptive liquid filter
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WO2019172077A1 (ja) * 2018-03-07 2019-09-12 旭化成株式会社 中空糸膜、及び中空糸膜の製造方法
US10675588B2 (en) 2015-04-17 2020-06-09 Emd Millipore Corporation Method of purifying a biological material of interest in a sample using nanofiber ultrafiltration membranes operated in tangential flow filtration mode
WO2020174951A1 (ja) * 2019-02-28 2020-09-03 富士フイルム株式会社 液体フィルターおよび液体フィルターの製造方法
CN111644079A (zh) * 2020-06-03 2020-09-11 武汉纺织大学 一种高表面粗糙度的纳滤膜材料及其制备方法
US10828587B2 (en) 2015-04-17 2020-11-10 Hollingsworth & Vose Company Stable filter media including nanofibers
US10988898B2 (en) * 2016-10-31 2021-04-27 Hunan University Of Science And Technology Method for preparing active carbon-based special synthetic paper
US11015294B2 (en) * 2016-10-31 2021-05-25 Hunan University Of Science And Technology Method for preparing titanium dioxide-based synthetic paper
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US11154821B2 (en) 2011-04-01 2021-10-26 Emd Millipore Corporation Nanofiber containing composite membrane structures
US11324123B2 (en) * 2017-04-21 2022-05-03 Amogreentech Co., Ltd Printed circuit nanofiber web manufacturing method
US11359064B2 (en) 2017-11-15 2022-06-14 Amogreentech Co., Ltd. Composition for producing graphite-polymer composite and graphite-polymer composite produced therethrough
US11452959B2 (en) 2018-11-30 2022-09-27 Hollingsworth & Vose Company Filter media having a fine pore size distribution
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US11839855B2 (en) 2017-06-09 2023-12-12 Amogreentech Co., Ltd. Filter medium, manufacturing method therefor, and filter unit including same

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX346385B (es) 2013-02-14 2017-03-16 Nanopareil Llc Fieltros hibridos de nanofibras electrohiladas.
KR20160141912A (ko) * 2015-06-01 2016-12-12 주식회사 아모그린텍 흡착 멤브레인
KR101878355B1 (ko) * 2015-06-01 2018-07-16 주식회사 아모그린텍 기체필터
WO2016208923A1 (ko) * 2015-06-23 2016-12-29 주식회사 아모라이프사이언스 안전필터 및 이를 구비한 주사기
WO2017048103A1 (ko) 2015-09-15 2017-03-23 주식회사 아모그린텍 이온교환막 및 그 제조방법
KR102020774B1 (ko) * 2015-09-15 2019-09-11 주식회사 아모그린텍 이온교환막 및 그 제조방법
KR102063671B1 (ko) * 2015-10-14 2020-02-12 주식회사 아모그린텍 약액 여과용 필터여재, 이의 제조방법 및 이를 포함하는 약액 여과용 필터모듈
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KR102602668B1 (ko) * 2016-10-14 2023-11-15 주식회사 아모그린텍 수처리용 평판형 필터 및 이를 포함하는 평판형 필터모듈
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KR102591622B1 (ko) * 2016-10-27 2023-10-19 주식회사 아모그린텍 수처리용 평판형 필터
KR102603560B1 (ko) * 2016-10-27 2023-11-17 주식회사 아모그린텍 수처리용 평판형 필터
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WO2018110990A1 (ko) * 2016-12-15 2018-06-21 주식회사 아모그린텍 필터여재, 이의 제조방법 및 이를 포함하는 필터유닛
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JP7219412B2 (ja) * 2021-06-04 2023-02-08 ダイキン工業株式会社 エアフィルタ濾材、プリーツ状濾材、エアフィルタユニット、マスク用濾材、および、エアフィルタ濾材の再生方法
CN115071247B (zh) * 2022-07-21 2022-12-13 江苏讯海自动化科技有限公司 一种工业裁膜叠膜机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030177909A1 (en) * 2002-01-31 2003-09-25 Koslow Evan E. Nanofiber filter media
US6706361B1 (en) * 2000-06-21 2004-03-16 Board Of Trustees Of University Of Illinois Polymeric ion exchange fibers
US20090016310A1 (en) * 2007-07-13 2009-01-15 Rasal Digambar L Optimized usage of access technology in a multi-mode architecture
US20090261035A1 (en) * 2006-09-20 2009-10-22 E. I. Du Pont De Nemours And Company Nanowebs
US20100282682A1 (en) * 2007-12-31 2010-11-11 Eaton Bradley W Fluid filtration articles and methods of making and using the same

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100572277B1 (ko) * 2004-02-16 2006-04-19 최용석 화학흡착제 및 이의 제조방법
US8689985B2 (en) 2005-09-30 2014-04-08 E I Du Pont De Nemours And Company Filtration media for liquid filtration
KR100741982B1 (ko) * 2005-11-25 2007-07-23 (주)하멜 연속식 핫멜트블로운 방법에 의한 이온교환 수지가고밀도로 충전된 이온교환 섬유 복합필터 소재의 제조방법
US8118177B2 (en) * 2006-10-04 2012-02-21 Sellars Absorbent Materials, Inc. Non-woven webs and methods of manufacturing the same
US8002990B2 (en) * 2007-07-27 2011-08-23 Kx Technologies, Llc Uses of fibrillated nanofibers and the removal of soluble, colloidal, and insoluble particles from a fluid
JP5724180B2 (ja) * 2007-07-31 2015-05-27 東レ株式会社 分離膜支持体およびその製造方法
US8978899B2 (en) 2007-08-01 2015-03-17 Donaldson Company, Inc. Fluoropolymer fine fiber
US20100151760A1 (en) * 2008-12-15 2010-06-17 E. I. Du Pont De Nemours And Company Non-woven sheet containing fibers with sheath/core construction
CN101717561B (zh) * 2009-11-13 2011-11-02 宁波山泉建材有限公司 聚酯防水透气膜及三层复合材料及其制备方法与用途
KR101308519B1 (ko) 2010-06-30 2013-09-17 주식회사 아모그린텍 전기방사된 나노 섬유 웹을 이용한 액체 필터용 필터여재와 그 제조방법 및 이를 이용한 액체 필터
US20120077405A1 (en) * 2010-09-29 2012-03-29 Hao Zhou Core/Shell Nanofiber Non-Woven
US20120238982A1 (en) * 2011-03-15 2012-09-20 Paul Thomas Weisman Structured Fibrous Web

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6706361B1 (en) * 2000-06-21 2004-03-16 Board Of Trustees Of University Of Illinois Polymeric ion exchange fibers
US20030177909A1 (en) * 2002-01-31 2003-09-25 Koslow Evan E. Nanofiber filter media
US20090261035A1 (en) * 2006-09-20 2009-10-22 E. I. Du Pont De Nemours And Company Nanowebs
US20090016310A1 (en) * 2007-07-13 2009-01-15 Rasal Digambar L Optimized usage of access technology in a multi-mode architecture
US20100282682A1 (en) * 2007-12-31 2010-11-11 Eaton Bradley W Fluid filtration articles and methods of making and using the same

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9750829B2 (en) 2009-03-19 2017-09-05 Emd Millipore Corporation Removal of microorganisms from fluid samples using nanofiber filtration media
US9889214B2 (en) 2009-03-19 2018-02-13 Emd Millipore Corporation Removal of microorganisms from fluid samples using nanofiber filtration media
US9943616B2 (en) 2009-03-19 2018-04-17 Emd Millipore Corporation Removal of microorganisms from fluid samples using nanofiber filtration media
US10064965B2 (en) 2009-03-19 2018-09-04 Emd Millipore Corporation Removal of microorganisms from fluid samples using nanofiber filtration media
US10722602B2 (en) 2009-03-19 2020-07-28 Emd Millipore Corporation Removal of microorganisms from fluid samples using nanofiber filtration media
US9623352B2 (en) 2010-08-10 2017-04-18 Emd Millipore Corporation Method for retrovirus removal
US10252199B2 (en) 2010-08-10 2019-04-09 Emd Millipore Corporation Method for retrovirus removal
US11154821B2 (en) 2011-04-01 2021-10-26 Emd Millipore Corporation Nanofiber containing composite membrane structures
US10675588B2 (en) 2015-04-17 2020-06-09 Emd Millipore Corporation Method of purifying a biological material of interest in a sample using nanofiber ultrafiltration membranes operated in tangential flow filtration mode
US10828587B2 (en) 2015-04-17 2020-11-10 Hollingsworth & Vose Company Stable filter media including nanofibers
US11819789B2 (en) 2015-04-17 2023-11-21 Hollingsworth & Vose Company Stable filter media including nanofibers
US20180147533A1 (en) * 2015-06-01 2018-05-31 Amogreentech Co., Ltd. Adsorptive liquid filter
US10682613B2 (en) * 2015-06-01 2020-06-16 Amogreentech Co., Ltd. Adsorptive liquid filter
EP3231595B1 (de) * 2016-04-14 2022-09-28 Sefar AG Komposit und verfahren zum herstellen eines komposits für eine akustische komponente
EP3348393B1 (de) * 2016-04-14 2023-06-21 Sefar AG Kompositmembran und verfahren zum herstellen einer kompositmembran
WO2017213593A3 (en) * 2016-06-10 2018-03-01 National Science And Technology Development Agency Gleanable and sunlight-tolerant multifunctional nanofibrous filter for water and air filtration and fabrication process of nanofibrous filter thereof
CN109475215A (zh) * 2016-07-07 2019-03-15 株式会社黛怡茜 化妆品
CN106492653A (zh) * 2016-09-19 2017-03-15 江苏海纳空调净化设备有限公司 一种用于空调的过滤网
US10988898B2 (en) * 2016-10-31 2021-04-27 Hunan University Of Science And Technology Method for preparing active carbon-based special synthetic paper
US11015294B2 (en) * 2016-10-31 2021-05-25 Hunan University Of Science And Technology Method for preparing titanium dioxide-based synthetic paper
US11478734B2 (en) 2016-12-15 2022-10-25 Amogreentech Co., Ltd. Filter medium, method for manufacturing same, and filter unit comprising same
CN110049807A (zh) * 2016-12-15 2019-07-23 曼·胡默尔有限公司 过滤介质、其制备方法和所述过滤介质在过滤元件中的用途
US11324123B2 (en) * 2017-04-21 2022-05-03 Amogreentech Co., Ltd Printed circuit nanofiber web manufacturing method
US11839855B2 (en) 2017-06-09 2023-12-12 Amogreentech Co., Ltd. Filter medium, manufacturing method therefor, and filter unit including same
US11359064B2 (en) 2017-11-15 2022-06-14 Amogreentech Co., Ltd. Composition for producing graphite-polymer composite and graphite-polymer composite produced therethrough
JPWO2019172077A1 (ja) * 2018-03-07 2020-12-03 旭化成株式会社 中空糸膜、及び中空糸膜の製造方法
JP7095072B2 (ja) 2018-03-07 2022-07-04 旭化成株式会社 中空糸膜、及び中空糸膜の製造方法
WO2019172077A1 (ja) * 2018-03-07 2019-09-12 旭化成株式会社 中空糸膜、及び中空糸膜の製造方法
US11452959B2 (en) 2018-11-30 2022-09-27 Hollingsworth & Vose Company Filter media having a fine pore size distribution
US11890561B2 (en) 2018-11-30 2024-02-06 Hollingsworth & Vose Company Filter media having a fine pore size distribution
JPWO2020174951A1 (ja) * 2019-02-28 2021-12-23 富士フイルム株式会社 液体フィルターおよび液体フィルターの製造方法
WO2020174951A1 (ja) * 2019-02-28 2020-09-03 富士フイルム株式会社 液体フィルターおよび液体フィルターの製造方法
CN111644079A (zh) * 2020-06-03 2020-09-11 武汉纺织大学 一种高表面粗糙度的纳滤膜材料及其制备方法
CN113134267A (zh) * 2021-04-23 2021-07-20 东华大学 一种具有多层结构的热舒适性过滤材料及其制备方法
CN115337798A (zh) * 2022-07-15 2022-11-15 上海工程技术大学 具有稳定晶型的大孔径pvdf中空纤维膜及其制备方法
CN115304082A (zh) * 2022-10-11 2022-11-08 山东鲁泰化学有限公司 一种用于氯碱生产的盐泥中NaCl回收工艺

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