WO2018021426A1 - 逆洗可能なデプスフィルター - Google Patents
逆洗可能なデプスフィルター Download PDFInfo
- Publication number
- WO2018021426A1 WO2018021426A1 PCT/JP2017/027091 JP2017027091W WO2018021426A1 WO 2018021426 A1 WO2018021426 A1 WO 2018021426A1 JP 2017027091 W JP2017027091 W JP 2017027091W WO 2018021426 A1 WO2018021426 A1 WO 2018021426A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- fiber
- filter
- porosity
- filter medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
-
- 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
- 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
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/593—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives to layered webs
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
- D04H3/147—Composite yarns or filaments
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
- D04H3/153—Mixed yarns or filaments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0216—Bicomponent or multicomponent fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/0622—Melt-blown
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/064—The fibres being mixed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/12—Special parameters characterising the filtering material
- B01D2239/1208—Porosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/12—Special parameters characterising the filtering material
- B01D2239/1233—Fibre diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/44—Cartridge types
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/30—Filter housing constructions
Definitions
- the present invention relates to a filter medium for efficiently capturing and removing organisms contained in water, particularly organisms having a minimum size of 50 ⁇ m or more, in a water treatment apparatus for filtering a large amount of water containing organisms and foreign substances.
- a filter housing is generally attached to a water treatment device, and microbes and foreign substances in water are collected by a cartridge filter mounted therein. By backwashing this cartridge filter, it is possible to collect foreign substances a plurality of times.
- Patent Document 1 discloses a cylindrical metal mesh filter composed of an inner layer and an outer layer as a filtering material for a seawater treatment apparatus, with an opening of 30 to 100 ⁇ m for the inner layer and 300 to 3000 ⁇ m for the outer layer. Some have been disclosed.
- the filter medium disclosed in Patent Document 1 discloses that the inner layer filter and the outer layer filter are made of a metal such as a nickel-base alloy or seawater resistant stainless steel, and the inner layer and the outer layer may be integrated by sintering. ing.
- metal filters are expensive, difficult to dispose, and it is difficult to achieve both the collection performance and the ease of backwashing, so they are manufactured from inexpensive raw materials other than metal and backwashed. There was a need for a filter that could.
- Patent Document 2 discloses a cylindrical filter suitable for liquid filtration, in which at least one layer of nonwoven fabric is 30 degrees or less with respect to the circumferential direction of the cylindrical filter. A melt blown nonwoven fabric having an average orientation angle is disclosed.
- the invention of Patent Document 2 pays attention to the fact that, in a filter made of a nonwoven fabric, when particles to be filtered are collected in an aperture portion composed of fibers, the permeability of the particles differs depending on the shape of the aperture portion, By providing the orientation direction of the fibers constituting the fiber within a certain range, a filter having a low water flow resistance and a long filtration life is provided. However, it is assumed that such a filter passes water in only one direction. When backwashing is performed, there is a problem that the filter shape cannot be maintained because back pressure is applied particularly to the outermost layer of the filter.
- an object of the present invention is to provide a resin filter that is used in a water treatment apparatus and can be backwashed.
- the present inventors have conducted intensive research as adopting a depth filter made of thermoplastic resin fibers as a filter medium. Then, the depth filter has a structure of at least three layers, and further, it has been found that the problem can be solved by adjusting the porosity of the three layers to a specific range, and a structure having specific physical properties. Based on this, the present invention has been completed.
- the configuration of the present invention is as follows.
- a hollow cylindrical depth filter made of thermoplastic resin fibers and having a filter medium thickness of 5 to 25 mm,
- the filter medium has a compression ratio of 0.2 or less when a load of 0.5 MPa is applied,
- the filter medium has at least three fiber layers from the fluid inflow side to the outflow side,
- the porosity of the first layer on the fluid inflow side is in the range of 0.70 to 0.85
- the porosity of the second layer on the fluid inflow side is in the range of 0.60 to 0.80;
- the porosity of the third layer on the fluid inflow side is in the range of 0.70 to 0.85,
- the intersections of the fibers constituting the filter medium are combined, The average distance between the intersections is 2 to 100 times the average fiber diameter with respect to the fiber length direction,
- a depth filter wherein the ratio of the average fiber diameter on the upstream surface of the filter medium to the average fiber diameter on the downstream surface is 0.9 to 1.2 times.
- the depth filter of the present invention has a strength that can withstand backwashing, and when used in a water treatment apparatus, foreign substances captured by filtration can be discharged by backwashing. That is, the depth filter of the present invention can be filtered a plurality of times by backwashing and regenerating.
- the depth filter of the present invention is made of resin and is more advantageous in terms of cost than a conventional metal filter.
- the depth filter of the present invention is a hollow cylindrical shape made of thermoplastic resin fibers and having a thickness of 5 to 25 mm, and the compression ratio when the load of 0.5 MPa is applied is 0.2.
- the filter medium has at least three fiber layers from the fluid inflow side to the outflow side, and the porosity of the first layer on the fluid inflow side is in the range of 0.70 to 0.85.
- the porosity of the second layer on the fluid inflow side is in the range of 0.60 to 0.80, and the porosity of the third layer on the fluid inflow side is in the range of 0.70 to 0.85.
- the depth filter of the present invention has at least three fiber layers, and other layers may be provided on the surface layer or inner layer of the three fiber layers as long as the effects of the present invention can be achieved.
- the depth filter of the present invention has at least three fiber layers of the first layer, the second layer, and the third layer from the fluid inflow side to the outflow side of the filter medium.
- the porosity is in the range of 0.70 to 0.85
- the porosity of the second layer on the fluid inflow side is in the range of 0.60 to 0.80
- the porosity of the third layer on the fluid inflow side is 0. It has a feature that it is in the range of 70 to 0.85.
- the porosity is a percentage of the clearance per unit volume, and details of measurement and calculation methods are shown in the examples described later.
- the porosity of the second layer is made lower than that of the first layer
- the porosity of the third layer is made higher than that of the second layer
- the porosity of the third layer and the first layer is substantially reduced. It only has to be equal.
- the porosity of the first layer and the third layer may be the same or different, and when they are different, the difference in the porosity of each other is preferably within 0.15.
- the processing conditions for forming each fiber layer may be adjusted as appropriate.
- a net layer can be provided further outside the first layer (the outermost layer of the filter).
- a further filtration layer having a different porosity can be provided between the first layer and the second layer and / or between the second layer and the third layer.
- the fiber used for the filter medium of the depth filter is composed of a thermoplastic resin.
- the thermoplastic resin is not particularly limited as long as it can constitute the filter having the structure of the present invention.
- the thermoplastic resin may be used alone or a mixture of two or more kinds of thermoplastic resins may be used.
- the thermoplastic resin may contain various functional agents as long as the effects of the present invention are not hindered. Specifically, the antibacterial agent, deodorant, hydrophilizing agent, water repellent, surface activity. An agent etc. can be illustrated.
- the fiber may be a single component fiber composed of a single resin component or a composite fiber composed of two or more resin components.
- the mixed fiber by which the at least 2 fiber chosen from the group which consists of a single component fiber and a composite fiber was mixed may be sufficient.
- the difference in melting point between the components is preferably at least 10 ° C. or more. If the difference in melting point is 10 ° C. or more, the high melting point component may be softened or melted to form a film when the heat-bonded portion is formed in the production of the filter material, that is, when the intersections of the fibers are bonded (fused).
- the filter is not formed into a film and the pore diameter is not crushed, and the filtration accuracy such as a decrease in water permeability is not greatly affected.
- the cross-sectional shape of the fiber is not limited, and may be circular or non-circular.
- the melting point of the fiber component here is generally a temperature that can be measured with a differential scanning calorimeter (DSC) and appears as an endothermic peak in the DSC measurement chart.
- DSC differential scanning calorimeter
- the melting point does not necessarily appear clearly, so that the softening point generally used is substituted, and differential thermal analysis (DTA) or the like is used for the measurement.
- the combinations of the resin components constituting the mixed fiber and the composite fiber include, for example, two types of polypropylene having different melting points, polyethylene and polypropylene, and a low-melting point combination.
- examples include polymerized polyester and polyester, polyethylene and polyester, but are not limited thereto.
- the ratio of the low melting point component is preferably 30 wt% or more and less than 70 wt% in the case of a mixed fiber, and in the case of a composite fiber, the ratio of the low melting point component is 30 wt. % Or more and preferably less than 70 wt%.
- the form of the composite fiber is not limited, and may be any one of a concentric sheath core, an eccentric sheath core, a parallel structure, and the like.
- the depth filter of the present invention is characterized in that the thickness of the filter medium is 5 to 25 mm. If the thickness of the filter medium is 5 mm or more, it is good in that it is easy to produce the effect of providing the first layer to the third layer, and if it is within 25 mm, it is not necessary to excessively increase the pressure used for backwashing. preferable. More preferably, the thickness of the filter medium is 7 to 20 mm, and if it is in this range, it is more preferable in that the particles can be collected sufficiently and easily exchanged by human hands.
- the range of the thinnest average fiber diameter is 0.1 to 100 ⁇ m. If this value is 0.1 ⁇ m or more, it is possible to prevent a decrease in filtration life due to particles other than living organisms contained in water. Moreover, if this value is 100 ⁇ m or less, the porosity for achieving the required filtration accuracy can be set to a reasonably high value, so that it is possible to prevent a decrease in the filtration life. A value of 30 to 70 ⁇ m is preferable because it is possible to achieve both the collection efficiency and the liquid permeability when removing organisms with a minimum size of 50 ⁇ m or more contained in water.
- the thinnest average fiber diameter portion has a thickness of 2 mm or more.
- the portion with the thinnest average fiber diameter means a portion where the average fiber diameter is in the range of 1 to 1.2 times the thinnest average fiber diameter.
- the thickness of 2 mm or more is preferable in that the organisms to be collected can be reliably collected.
- the depth filter of the present invention is characterized in that the ratio of the average fiber diameter on the upstream surface of the filter medium to the average fiber diameter on the downstream surface is 0.9 to 1.2 times.
- the average fiber diameter on the upstream surface refers to the average fiber diameter determined by observing the surface of the filter medium on the liquid inflow side with a microscope
- the average fiber diameter on the downstream surface refers to the surface of the filter medium on the liquid outflow side of the filter medium. Means the average fiber diameter determined by observation. Since the depth filter of the present invention typically performs filtration in a manner in which liquid flows in from the outside of the cylinder and flows out from the inner surface of the cylinder, the upstream surface is an outer surface of a hollow cylindrical shape,
- the downstream surface is a hollow cylindrical inner wall side surface.
- the ratio of the average fiber diameter is calculated by dividing the value of the average fiber diameter on the upstream surface by the value of the average fiber diameter on the downstream surface, and this value is preferably 0.9 to 1.2. In other words, it is desirable that the value of the average fiber diameter on the upstream surface is close to the value of the average fiber diameter on the downstream surface.
- the intersections of the fibers constituting the filter medium are combined in the filter medium, and the average interval between the intersection points is 2 to 100 times the average fiber diameter with respect to the fiber length direction.
- the bond at the intersection of the fibers can be formed, for example, by thermal fusion.
- the average distance between the fiber intersections is an index representing the degree of firmness of the pores formed in the filter medium. If this value is 100 times or less, the deformation of the hole due to the filtration pressure or the pressure during backwashing is small. Moreover, when this value is larger than twice, it becomes a filter having sufficient liquid permeability and particle retention ability.
- the average interval between the fiber intersections is calculated by the method described in detail in Examples described later.
- the depth filter of the present invention is characterized in that the compression ratio when a load of 0.5 MPa is applied to the filter medium is 0.2 or less.
- the compression ratio of the filter medium is an index representing the ease of deformation of the filter medium with respect to a continuous external load. If the compression ratio when a load of 0.5 MPa is applied is 0.2 or less, the filtration pressure and This is preferable because there is almost no deformation due to pressure during backwashing.
- the depth filter of the present invention preferably has a degree of deformation during backwashing of less than 0.05.
- the degree of deformation at the time of backwashing is the degree to which the filter is deformed when water is passed through the filter in the direction opposite to that during normal use (typically from the inside to the outside of the filter). It is as the example of this.
- the degree of deformation is less than 0.05, it is preferable in that the filter medium is not damaged during backwashing and stable filtration performance is maintained. If it exceeds 0.05, the filter medium will be damaged, and the filter will be temporarily or permanently removed from the mounting position, making it impossible to perform efficient backwashing, or even when it is returned to normal use. May be affected.
- the depth filter of the present invention preferably has a filtration accuracy of 5 to 60 ⁇ m.
- the filtration accuracy referred to in the present application refers to a particle size at which the collection efficiency is 90% when a powder having a specific particle size distribution is filtered, and a specific measurement method is shown in Examples described later.
- the filter of the present invention is preferably used in a water treatment apparatus. In view of the filtration performance required for the water treatment apparatus, the filtration accuracy is suitably 5 to 60 ⁇ m.
- the filtration accuracy can be adjusted by controlling the thickness of the filter medium, the porosity, the distance between fiber intersections, and the like.
- the depth filter of the present invention can be manufactured as follows, for example.
- the type and production method are not particularly limited, and known melt-blown nonwoven fabric production methods can be used.
- a melt-blown nonwoven fabric is obtained by melt-extruding a thermoplastic resin, spinning from a melt-blow spinneret, blow-spinning it as a fiber stream with a high-temperature and high-speed gas, and collecting the fibers as a web with a collection device. Heat-bond the fibers together.
- a gas such as air or nitrogen gas is usually used as the high-temperature and high-speed gas used in melt blow spinning.
- the gas temperature is generally 200 to 500 ° C.
- the pressure is generally 0.01 to 0.65 MPa.
- melt blown non-woven fabric a melt blown non-woven fabric made of a single component fiber, a melt blown non-woven fabric made of a composite fiber, a melt blown non-woven fabric made of a mixed fiber, and the like can be used, and those made of heat-fusible composite fiber or mixed fiber are preferable.
- the melt blown nonwoven fabric may be subjected to secondary processing for imparting functions within a range that does not impede its effect, and a hydrophilic or hydrophobic coating treatment, a specific functional group on the surface of the fibers constituting the melt blown nonwoven fabric Examples thereof include chemical treatment and sterilization treatment.
- the fiber web produced by the melt-blowing method is heated at a temperature higher than the melting point of the low-melting component fiber, and the low-melting component is heat-sealed.
- a hollow cylindrical depth filter can be formed.
- the web is formed by using a forming apparatus having a conveyor, a heating machine and a winder, and a method of winding the web around the core while continuously heating the web after spinning, and then winding the web around the core.
- a sheet nonwoven fabric is formed by thermally bonding the fibers of the web melt blow method, and then the nonwoven fabric is heated again, wound around the core in a molten state,
- This is a method in which a wound nonwoven fabric is heat bonded and formed into a hollow cylinder.
- the heating method for the web include a hot embossing method, a thermal calendar method, a hot air method, an ultrasonic bonding method, and a far infrared heating method.
- a fiber obtained by a melt-blowing method is used as a web, and this is wound around a cylindrical metal rod while being thermocompression-bonded to form a third layer serving as a core. . Then, winding-up conditions are changed and it winds up more densely than a 3rd layer, and forms a 2nd layer (filtration layer). Finally, the winding condition can be returned in the same manner as in the third layer and wound up to form the first layer (skin layer).
- the filter of the present invention is produced by winding a non-woven fabric around a cylindrical metal rod while thermocompression bonding. At this time, it is preferable that the outer surface and the inner surface of the cylindrical filter are firmly adhered, and the other portions are wound with a relatively low adhesive strength.
- “relatively low wrapping strength” means that the adhesive strength between layers is lower than that of the nonwoven fabric itself when the filter medium that has been thermocompression bonded is forced to peel again. Means strength that can be peeled without tearing.
- “strengthening the adhesion” means that the adhesive strength between the layers is about the same as the non-woven fabric itself, and the non-woven fabric is not torn, even if the thermo-compressed filter medium is forced to peel again.
- the higher the adhesive strength the better in terms of preventing deformation of the filter medium.
- the adhesive strength is excessive, the liquid permeability may be hindered or the filtration life may be shortened. Therefore, it is preferable to make the adhesive strength inside the filter medium relatively weak in order to strengthen the adhesive strength of the surface of the filter medium, which has a great influence when deformed, and to ensure liquid permeability. It is desirable to provide the portion where the adhesion is strong up to a thickness of about 0.5 to 3 mm from the outer surface. When the thickness is 0.5 mm or more, the purpose of suppressing deformation of the filter medium surface can be achieved.
- the strength of adhesion can be controlled by the load at the time of crimping, the heating temperature, the heating time, etc. For example, when adjusting with the load at the time of crimping, the larger the load, the stronger the adhesion, and the smaller the load, the weaker the adhesion. can do.
- the columnar metal rod is preferably heated in order to firmly bond the inner surface of the filter medium.
- This heating temperature is preferably set to a condition that the fiber shape is not excessively broken and sufficient adhesive strength is provided.
- the metal rod may be extracted and then heated with hot air.
- heat-fusible fibers it is desirable to heat the surface in order to firmly bond the outer surface of the filter medium.
- hot air can be applied from the surface, it can be put into a heated mold for a short time, or a cylinder can be rotated on a heated plate.
- the filter medium manufactured as described above is suitably used as a hollow cylindrical depth filter by cutting it into an appropriate size.
- the depth filter is usually formed into a hollow cylindrical shape having an inner diameter of 25 mm to 160 mm, an outer diameter of 55 mm to 200 mm, and a thickness of about 5 mm to 25 mm.
- said manufacturing method is only an outline
- roping a phenomenon in which the fibers are excessively entangled (generally referred to as “roping”) occurs, and the obtained nonwoven fabric has an excessively high porosity.
- the occurrence of roping in the melt-blowing method is generally when the average fiber diameter is 20 ⁇ m or more, depending on the resin used and the production conditions.
- the melt blown nonwoven fabric is collected on a porous body having air permeability such as a conveyor net or a suction drum. Therefore, the uneven surface pattern of the porous body is often transferred to the nonwoven fabric surface, so that it is often thicker.
- the final porosity is also increased, and the pressure resistance of the filter may be lowered, or the deformation during backwashing may be increased.
- a rotating cylindrical body having a smooth surface is installed between the spinneret and the suction conveyor or suction drum for collecting the thermoplastic fibers, and a part of all the fibers of the spun thermoplastic fibers are in a semi-solid state.
- the surface of the non-woven fabric is smoothed and the porosity of the non-woven fabric is reduced at the same time by moving and collecting the thermoplastic fibers on the lower suction conveyor after direct contact with the inclined portion of the rotating cylindrical body.
- the fibers are collected in a semi-solid state, so that the nonwoven fabric is crushed by its own weight and the porosity is suppressed, and the smooth surface pattern of the rotating cylinder is transferred to the nonwoven fabric surface, further reducing the porosity.
- the second layer was cut out from the filter (the layer having the one-layer structure of the comparative example was cut out), the surface of the filter medium was photographed with an electron microscope, and the fiber length between the fiber intersections was measured.
- the value obtained by dividing the fiber length by the fiber diameter of the fiber between the fiber intersections was defined as the fiber intersection interval.
- the value was measured for 100 points, and the arithmetic average value was defined as the average interval of fiber intersections.
- a filter is attached to the housing of the circulating filtration performance tester, and water is circulated so that water flows from the outside to the inside of the cylinder with a pump from a 50 liter water tank.
- 7 kinds of JIS powders which are standard powders for basic physical properties, were continuously added as test powders in the water tank at 0.2 g per minute, and the stock solution and filtrate were added 5 minutes after the start of addition.
- the number of particles (A) collected and measured using a light blocking particle detector, and compared with the number of particles (B) collected by the filter for each particle size, The value calculated by the formula (B / A ⁇ 100%) was taken as the collection efficiency.
- the value was analyzed, and the particle size at which the collection efficiency was 90% was defined as the filtration accuracy.
- a high melting point component spinning hole having a hole diameter of 0.3 mm and a low melting point component spinning hole having a hole diameter of 0.3 mm are alternately arranged at a hole ratio of 1: 1. / 10 min (230 ° C., mp 165 ° C.), and propylene / ethylene / butene-1 terpolymer (MFR 73 g / 10 min (190 ° C.), mp. 135 ° C.) as low melting point components, respectively.
- Extrusion was performed at a temperature of 290 ° C., 270 ° C., and a fiber mixing ratio of 50:50. Heated air at 380 ° C.
- the obtained non-woven fabric A had an average fiber diameter of 50 ⁇ m.
- the finely divided fibers are deposited on the surface of a stainless steel rotating roll having an outer diameter of 120 mm installed in parallel with the nozzles, and then collected on a suction conveyor net.
- a mixed fiber melt blown nonwoven fabric B having a basis weight of 40 g / m 2 was produced.
- the obtained nonwoven fabric B had an average fiber diameter of 50 ⁇ m.
- the nonwoven fabric A was heated with an air-through dryer and wound around a stainless steel pipe having an outer diameter of 30 mm until the outer diameter became 40 mm in a state where the low melting point component was dissolved.
- the non-woven fabric B was heated with an air-through dryer, and the low melting point component was dissolved, and the non-woven fabric B was wound around an outer position of the non-woven fabric A previously wound until the outer diameter reached 52 mm.
- the non-woven fabric A was heated with an air-through dryer, and the low melting point component was dissolved, and the non-woven fabric A was wound around an outer position of the non-woven fabric B wound earlier until the outer diameter reached 62 mm.
- the thing wound up by the stainless steel pipe was put on the roll heated at the temperature of 150 degreeC, and the heating was added to the wound thing by rotating both the stainless steel pipe and the heated roll. Thereafter, the stainless steel pipe was taken out and then cut into a length of 250 mm to obtain a hollow cylindrical filter having an outer diameter of 62 mm, an inner diameter of 30 mm, and a length of 250 mm.
- Nonwoven fabric A was prepared in the same manner as in Example 1, heated with an air-through dryer, and wound around a stainless steel pipe with an outer diameter of 30 mm until the outer diameter reached 62 mm with the low melting point component dissolved. Then, the thing wound up on the stainless steel pipe was put on the roll heated at the temperature of 150 degreeC, and heat was added to the wound thing by rotating both the stainless steel pipe and the heated roll. Thereafter, the stainless steel pipe was taken out and then cut into a length of 250 mm to obtain a hollow cylindrical cartridge filter having an outer diameter of 62 mm, an inner diameter of 30 mm, and a length of 250 mm. This filter was relatively soft and greatly deformed during backwashing.
- this nonwoven fabric was heated with an air-through dryer and wound around a polypropylene porous cylinder having an inner diameter of 30 mm and an outer diameter of 35 mm until the outer diameter reached 62 mm.
- the end portion of the winding was adhered by heat sealing, and this was cut into a length of 250 mm to obtain a hollow cylindrical cartridge filter having an outer diameter of 62 mm, an inner diameter of 30 mm, and a length of 250 mm.
- This filter was very soft and deformed greatly during backwashing.
- Example 2 A filter was produced under the same conditions as in Example 1 except that the spinning temperature was 300 ° C., 280 ° C., and the temperature of the heated air was 390 ° C. Both the nonwoven fabric A and the nonwoven fabric B had an average fiber diameter of 30 ⁇ m.
- Example 3 A hollow cylindrical cartridge filter having an outer diameter of 62 mm, an inner diameter of 30 mm, and a length of 250 mm was produced in the same manner as in Example 1 except that the step of heating on a roll heated to a temperature of 150 ° C. was omitted. This filter was able to be backwashed although part of the nonwoven fabric wound on the outermost layer of the filter was peeled off during backwashing.
- Table 1 shows the physical property evaluation results of the filters of Examples 1 to 3 and Comparative Examples 1 and 2.
- the depth filter of the present invention is composed only of fibers made of a thermoplastic resin without using a metal, it can be a low-cost, resin-washable filter. In addition, since the resin filter is lighter than the metal filter, it is possible to reduce the weight load applied to the filtration apparatus and the equipment in general.
- the depth filter of the present invention is suitably used as a filtration filter for fresh water treatment equipment and seawater treatment equipment.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Filtration Of Liquid (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
しかしながら、金属製フィルターはコストが高額になり、また廃棄も困難で、さらには捕集性能と逆洗の容易さとの両立が難しいため、金属以外の安価な原料で製造され、かつ逆洗することが可能なフィルターが求められていた。
[1]熱可塑性樹脂の繊維からなり、濾材の肉厚が5~25mmの中空円筒状デプスフィルターであって、
該濾材は0.5MPaの荷重を掛けた場合の圧縮比が0.2以下であり、
該濾材は流体流入側から流出側に向かって、少なくとも3層の繊維層を有しており、
流体流入側の第1層の空隙率が、0.70~0.85の範囲であり、
流体流入側の第2層の空隙率が、0.60~0.80の範囲であり、
流体流入側の第3層の空隙率が、0.70~0.85の範囲であり、
第1層の空隙率>第2層の空隙率の関係であり、
第3層の空隙率>第2層の空隙率の関係であり、
該濾材を構成する繊維の交点が結合しており、
該交点の平均間隔は繊維の長さ方向に対して平均繊維径の2~100倍であり、
該濾材の上流側表面の平均繊維径と、下流側表面の平均繊維径との比率が0.9~1.2倍である、デプスフィルター。
[2]逆洗時の変形度合いが0.05未満である、[1]のデプスフィルター。
[3]濾過精度が5~60μmである、[1]又は[2]のデプスフィルター。
[4]前記繊維が熱融着性繊維である、[1]~[3]のいずれかのデプスフィルター。
[5]前記熱融着性繊維が、10℃以上の融点差を有する2種類の熱可塑性樹脂からなる複合繊維である、[4]のデプスフィルター。
[6]前記熱融着性繊維が10℃以上の融点差を有する2種類の熱可塑性繊維の混繊である、[4]に記載のデプスフィルター。
[7]円筒の外層部が、その内側と比べて接着が強固である、[1]のデプスフィルター。
本発明のデプスフィルターは、熱可塑性樹脂の繊維からなる、濾材の肉厚が5~25mmの中空円筒状であって、該濾材は0.5MPaの荷重を掛けた場合の圧縮比が0.2以下であり、該濾材は流体流入側から流出側に向かって少なくとも3層の繊維層を有しており、流体流入側の第1層の空隙率が0.70~0.85の範囲であり、流体流入側の第2層の空隙率が0.60~0.80の範囲であり、流体流入側の第3層の空隙率が0.70~0.85の範囲であり、第1層の空隙率>第2層の空隙率、かつ、第3層の空隙率>第2層の空隙率の関係であり、該濾材を構成する繊維の交点が結合しており、該交点の平均間隔は繊維の長さ方向に対して平均繊維径の2~100倍であり、該濾材の上流側表面の平均繊維径と、下流側表面の平均繊維径との比率が0.9~1.2倍である。
本発明のデプスフィルターは、少なくとも3層の繊維層を有し、該3層の繊維層の表層または内層に、本願発明の効果を奏することができる限りは、他の層を設けてもよい。
本発明のデプスフィルターは例えば次のように製造することができる。
濾材を構成する繊維として、メルトブロー繊維を用いる場合、その種類や製造方法は、特に限定されず、公知のメルトブロー不織布の製造方法を使用することができる。例えば、メルトブロー不織布は、熱可塑性樹脂を溶融押出し、メルトブロー紡糸口金から紡出し、さらに高温高速の気体によって繊維流としてブロー紡糸し、捕集装置で繊維をウェブとして捕集し、得られたウェブを熱処理して繊維同士を熱融着させる。メルトブロー紡糸で用いる高温高速の気体は、通常、空気、窒素ガス等の気体が使用される。気体の温度は200~500℃、圧力は0.01~0.65MPaの範囲が一般に用いられる。
また、熱融着性繊維を使用する場合には、濾材の外側表面を強固に接着するため、表面を加熱するのが望ましい。表面を加熱する方法としては、表面から熱風を当てたり、あるいは熱した型に短時間入れたり、あるいは熱した板の上で円筒を回転させたりすることができる。
なお、本発明においての物性評価は以下に示す方法で行った。
フィルターから、各層を円筒状に切り出し、その外径(cm)、内径(cm)、長さ(cm)、重量(g)を測定した。それらの値から、その層の見かけ体積を次の式で算出した。
(外径×外径-内径×内径)÷4×3.14×長さ・・・(X)
次に、重量と樹脂の比重(g/cm3)から、濾材を構成する樹脂の体積を算出した。
重量÷比重・・・(Y)
これらの値を使い、次の式で空隙率を算出した。
(1-Y/X)×100%
電子顕微鏡で繊維の直径を100本計測し、算術平均値を平均繊維径とした。この計算は、Scion Corporation社の画像処理ソフト「Scion Image」を使用して行った。
フィルターから第2層を切り出し(比較例の1層構造のものはその層を切り出し)、濾材表面を電子顕微鏡で撮影し、繊維交点と繊維交点の間の繊維長を測定した。その繊維長を、その繊維交点と繊維交点の間の繊維の繊維径で除算した値を繊維交点の間隔とした。その値を100点について計測し、その算術平均値を繊維交点の平均間隔とした。
循環式濾過性能試験機のハウジングに、フィルター1本を取り付け、50リットル用水槽からポンプで、円筒の外側から内側に水が流れるよう通水循環する。流量を毎分30リットルに調節後、水槽の試験粉体として基礎物性用標準粉体であるJIS粉体7種を毎分0.2gで連続添加し、添加開始から5分後に原液と濾液を採取し、原液に含まれる粒子の個数(A)を、光遮断式粒子検出器を用いて計測し、各粒径の粒子ごとにフィルターが捕集した粒子の個数(B)と比較して、式=(B/A×100%)により算出した値を捕集効率とした。その値を解析して、捕集効率が90%となる粒径を濾過精度とした。
濾過精度測定後のフィルターを、循環式濾過性能試験機のハウジングに取り付けたまま、円筒の内側から外側に水が流れるよう、流量毎分30リットルに調節した状態で、フィルターの外径を測定し、その値を逆洗時の外径とした。その値と下記式を用いて、逆洗時の変形度合いを測定した。
逆洗時の変形度合い=(逆洗時の外径-元の外径)÷元の外径
濾材を20mm×20mmに切断し、元の厚さを測定し、続いて、この小片に0.5MPaの荷重を掛けた時の、小片の厚さを測定した。
測定した厚さと下記式を用いて、圧縮比を算出した。
圧縮比=(初期厚さ-荷重を掛けた時の厚さ)÷(初期厚さ)
孔径0.3mmの高融点成分紡糸孔と孔径0.3mmの低融点成分紡糸孔が孔数比1:1で交互に配置された混繊メルトブロー用紡糸口金を用い、高融点成分としてポリプロピレン(MFR68g/10分(230℃)、mp.165℃)、低融点成分としてプロピレン/エチレン/ブテン-1三元系共重合体(MFR73g/10分(190℃)、mp.135℃)を、それぞれ紡糸温度290℃、270℃、混繊比50:50で押し出した。380℃の加熱空気を圧力0.08MPaでブローし、直接サクションコンベアネットに捕集させ、目付40g/m2の混繊メルトブロー不織布Aを製造した。得られた不織布Aは、平均繊維径50μmであった。次に、不織布Aと同じ条件でブローし、細繊化した繊維をノズル下にノズルと平行に設置された外径120mmのステンレス製回転ロールの表面に堆積させた後、サクションコンベアネットに捕集させ、目付40g/m2の混繊メルトブロー不織布Bを製造した。得られた不織布Bは、平均繊維径50μmであった。次に、不織布Aをエアースルー型ドライヤーで加熱し、低融点成分を溶かした状態で、外径30mmのステンレスパイプに外径40mmになるまで巻きつけた。次に、不織布Bをエアースルー型ドライヤーで加熱し、低融点成分を溶かした状態で、先ほど巻きつけた不織布Aのさらに外側の位置に、外径52mmになるまで巻きつけた。次に、不織布Aをエアースルー型ドライヤーで加熱し、低融点成分を溶かした状態で、先ほど巻きつけた不織布Bのさらに外側の位置に、外径62mmになるまで巻きつけた。その後、ステンレスパイプに巻き取った物を温度150℃に加熱したロールの上に乗せ、ステンレスパイプと加熱したロールの双方を回転させることで、巻き取った物に加熱を加えた。その後、ステンレスパイプを抜き取った後に長さ250mmに切断することで、外径62mm、内径30mm、長さ250mmの中空円筒状のフィルターとした。
実施例1と同じ方法で不織布Aを作り、エアースルー型ドライヤーで加熱し、低融点成分を溶かした状態で、外径30mmのステンレスパイプに外径62mmになるまで巻きつけた。その後、ステンレスパイプに巻き取った物を温度150℃に加熱したロールの上に乗せ、ステンレスパイプと加熱したロールの双方を回転させることで、巻き取った物に熱を加えた。その後、ステンレスパイプを抜き取った後に長さ250mmに切断することで、外径62mm、内径30mm、長さ250mmの中空円筒状のカートリッジフィルターとした。このフィルターは、比較的柔らかく、逆洗時の変形が大きいものだった。
孔径0.3mmの単成分用メルトブロー用紡糸口金を用い、ポリプロピレン(MFR68g/10分(230℃)、mp.165℃)を、紡糸温度290℃で押し出した。383℃の加熱空気を圧力0.08MPaでブローし、直接サクションコンベアネットに捕集させ、目付40g/m2の混繊メルトブロー不織布を製造した。得られた不織布は、平均繊維径50μmであった。また、繊維交点がほとんど見られず、交点の間隔は明らかに100倍を越えるものだった。次に、この不織布をエアースルー型ドライヤーで加熱し、内径30mm、外径35mmのポリプロピレン製多孔筒に外径62mmになるまで巻きつけた。巻き終わり部分をヒートシールで接着し、これを長さ250mmに切断することで、外径62mm、内径30mm、長さ250mmの中空円筒状のカートリッジフィルターとした。このフィルターは、非常に柔らかく、逆洗時の変形が非常に大きいものだった。
紡糸温度を300℃、280℃、加熱空気の温度を390℃にした他は、実施例1と同じ条件でフィルターを作製した。不織布A、不織布B共に、平均繊維径は30μmだった。
温度150℃に加熱したロールの上で加熱する工程を省いた他は、全て実施例1と同じ方法で外径62mm、内径30mm、長さ250mmの中空円筒状のカートリッジフィルターを作製した。このフィルターは、逆洗時にフィルターの最外層に巻かれた不織布の一部が剥離したものの、逆洗は可能であった。
Claims (7)
- 熱可塑性樹脂の繊維からなる、濾材の肉厚が5~25mmの中空円筒状デプスフィルターであって、
該濾材は0.5MPaの荷重を掛けた場合の圧縮比が0.2以下であり、
該濾材は流体流入側から流出側に向かって、少なくとも3層の繊維層を有しており、
流体流入側の第1層の空隙率が、0.70~0.85の範囲であり、
流体流入側の第2層の空隙率が、0.60~0.80の範囲であり、
流体流入側の第3層の空隙率が、0.70~0.85の範囲であり、
第1層の空隙率>第2層の空隙率の関係であり、
第3層の空隙率>第2層の空隙率の関係であり、
該濾材を構成する繊維の交点が結合しており、
該交点の平均間隔は繊維の長さ方向に対して平均繊維径の2~100倍であり、
該濾材の上流側表面の平均繊維径と、下流側表面の平均繊維径との比率が0.9~1.2倍である、デプスフィルター。 - 逆洗時の変形度合いが0.05未満である、請求項1のデプスフィルター。
- 濾過精度が5~60μmである、請求項1又は2に記載のデプスフィルター。
- 前記繊維が熱融着性繊維である、請求項1~3のいずれか1項に記載のデプスフィルター。
- 前記熱融着性繊維が10℃以上の融点差を有する2種類の熱可塑性樹脂からなる複合繊維である請求項4に記載のデプスフィルター。
- 前記熱融着性繊維が10℃以上の融点差を有する2種類の熱可塑性繊維の混繊である請求項4に記載のデプスフィルター。
- 円筒の外層部が、その内側と比べて接着が強固である、請求項1に記載のデプスフィルター。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16/321,032 US11141686B2 (en) | 2016-07-28 | 2017-07-26 | Backwashable depth filter |
| CN201780044084.0A CN109562312A (zh) | 2016-07-28 | 2017-07-26 | 可逆洗深层过滤器 |
| KR1020197001506A KR20190022645A (ko) | 2016-07-28 | 2017-07-26 | 역세 가능한 뎁스 필터 |
| JP2018530364A JPWO2018021426A1 (ja) | 2016-07-28 | 2017-07-26 | 逆洗可能なデプスフィルター |
| EP17834428.9A EP3492158A4 (en) | 2016-07-28 | 2017-07-26 | BACKWASHABLE DEPTH FILTER |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-148535 | 2016-07-28 | ||
| JP2016148535 | 2016-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018021426A1 true WO2018021426A1 (ja) | 2018-02-01 |
Family
ID=61016629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2017/027091 Ceased WO2018021426A1 (ja) | 2016-07-28 | 2017-07-26 | 逆洗可能なデプスフィルター |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US11141686B2 (ja) |
| EP (1) | EP3492158A4 (ja) |
| JP (1) | JPWO2018021426A1 (ja) |
| KR (1) | KR20190022645A (ja) |
| CN (1) | CN109562312A (ja) |
| TW (1) | TW201803637A (ja) |
| WO (1) | WO2018021426A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2020196515A1 (ja) * | 2019-03-28 | 2020-10-01 | ||
| JP2022132669A (ja) * | 2022-05-30 | 2022-09-09 | 神奈川機器工業株式会社 | ろ過装置 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102842967B1 (ko) * | 2019-07-10 | 2025-08-05 | 현대자동차주식회사 | 경제형 흡기필터 및 이의 제조방법 |
| EP4001487A4 (en) * | 2019-07-16 | 2023-08-02 | Kuraray Kuraflex Co., Ltd. | FIBER STRUCTURE AND ASSOCIATED MANUFACTURING METHOD |
| US20220105455A1 (en) * | 2020-10-02 | 2022-04-07 | Protect Plus, Llc | Multistage filter cartridge |
| US20240299870A1 (en) * | 2021-02-08 | 2024-09-12 | Porex Technologies Corporation | Seamless filtration media and methods of use |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1119435A (ja) * | 1997-07-07 | 1999-01-26 | Tounen Tapirusu Kk | 極細複合繊維不織布からなる円筒状フィルター及びその製造方法 |
| WO2001052969A1 (fr) | 2000-01-21 | 2001-07-26 | Chisso Corporation | Filtre cylindrique et son procede de fabrication |
| JP2002018218A (ja) * | 2000-07-05 | 2002-01-22 | Toray Ind Inc | フィルター |
| JP2014004570A (ja) | 2012-06-27 | 2014-01-16 | Jfe Engineering Corp | 濾過体、これを有する濾過装置及び海水処理装置 |
| JP2015097979A (ja) * | 2013-11-18 | 2015-05-28 | Jnc株式会社 | フィルター |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5543047A (en) * | 1992-11-06 | 1996-08-06 | Pall Corporation | Filter with over-laid pleats in intimate contact |
| EP2134453A1 (en) * | 2007-03-19 | 2009-12-23 | Pall Corporation | Fluid treatment elements and fluid treatment arrangements with spaces between fluid treatment elements and method for making and using them |
| US8882876B2 (en) * | 2012-06-20 | 2014-11-11 | Hollingsworth & Vose Company | Fiber webs including synthetic fibers |
| US9149748B2 (en) * | 2012-11-13 | 2015-10-06 | Hollingsworth & Vose Company | Multi-layered filter media |
| EP3738659A1 (en) * | 2013-02-25 | 2020-11-18 | Hollingsworth & Vose Company | Multi-layered filter media |
-
2017
- 2017-07-26 US US16/321,032 patent/US11141686B2/en active Active
- 2017-07-26 CN CN201780044084.0A patent/CN109562312A/zh active Pending
- 2017-07-26 JP JP2018530364A patent/JPWO2018021426A1/ja active Pending
- 2017-07-26 KR KR1020197001506A patent/KR20190022645A/ko not_active Ceased
- 2017-07-26 EP EP17834428.9A patent/EP3492158A4/en not_active Withdrawn
- 2017-07-26 WO PCT/JP2017/027091 patent/WO2018021426A1/ja not_active Ceased
- 2017-07-27 TW TW106125200A patent/TW201803637A/zh unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1119435A (ja) * | 1997-07-07 | 1999-01-26 | Tounen Tapirusu Kk | 極細複合繊維不織布からなる円筒状フィルター及びその製造方法 |
| WO2001052969A1 (fr) | 2000-01-21 | 2001-07-26 | Chisso Corporation | Filtre cylindrique et son procede de fabrication |
| JP2002018218A (ja) * | 2000-07-05 | 2002-01-22 | Toray Ind Inc | フィルター |
| JP2014004570A (ja) | 2012-06-27 | 2014-01-16 | Jfe Engineering Corp | 濾過体、これを有する濾過装置及び海水処理装置 |
| JP2015097979A (ja) * | 2013-11-18 | 2015-05-28 | Jnc株式会社 | フィルター |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP3492158A4 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2020196515A1 (ja) * | 2019-03-28 | 2020-10-01 | ||
| WO2020196515A1 (ja) * | 2019-03-28 | 2020-10-01 | Jnc株式会社 | デプスフィルター |
| JP7368452B2 (ja) | 2019-03-28 | 2023-10-24 | Jnc株式会社 | デプスフィルター |
| JP2022132669A (ja) * | 2022-05-30 | 2022-09-09 | 神奈川機器工業株式会社 | ろ過装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20190160406A1 (en) | 2019-05-30 |
| JPWO2018021426A1 (ja) | 2019-05-23 |
| TW201803637A (zh) | 2018-02-01 |
| KR20190022645A (ko) | 2019-03-06 |
| EP3492158A4 (en) | 2020-01-22 |
| US11141686B2 (en) | 2021-10-12 |
| EP3492158A1 (en) | 2019-06-05 |
| CN109562312A (zh) | 2019-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018021426A1 (ja) | 逆洗可能なデプスフィルター | |
| JP6050752B2 (ja) | デプスフィルターとサブミクロンフィルターとの組合せを含むカートリッジフィルター並びにro前処理方法 | |
| JP4236284B2 (ja) | 筒状フィルター | |
| US20070289920A1 (en) | Pool and spa filter | |
| JPWO1998013123A1 (ja) | 高精度フィルター | |
| JP5823205B2 (ja) | カートリッジフィルター | |
| WO2000057988A1 (en) | Filter cartridge | |
| JP5461948B2 (ja) | 体外循環用白血球除去器 | |
| EP3159445A1 (en) | Non-woven fabric | |
| US20060089072A1 (en) | Composite filtration media | |
| JP4083951B2 (ja) | 筒状フィルタ | |
| JP2009112887A (ja) | 濾過材およびその製造方法、並びにカートリッジフィルター | |
| JPH09117624A (ja) | フィルター | |
| JP2001149720A (ja) | フィルター | |
| JP2001321619A (ja) | フィルターカートリッジ | |
| JP2001321620A (ja) | 筒状フィルタ | |
| JP2001321622A (ja) | フィルターカートリッジ | |
| JP2001327817A (ja) | フィルターカートリッジ | |
| JP4604351B2 (ja) | フィルターカートリッジ | |
| JP4464433B2 (ja) | 筒状フィルタ | |
| JP2000279727A (ja) | フィルターカートリッジ | |
| JP2008114177A (ja) | 吸気用フィルター不織布 | |
| JPWO2000057989A1 (ja) | フィルターカートリッジ | |
| JP4073150B2 (ja) | 筒状フィルタ | |
| JP4519674B2 (ja) | 濾過材及びそれを用いた筒状フィルタ |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17834428 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 2018530364 Country of ref document: JP Kind code of ref document: A |
|
| ENP | Entry into the national phase |
Ref document number: 20197001506 Country of ref document: KR Kind code of ref document: A |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| ENP | Entry into the national phase |
Ref document number: 2017834428 Country of ref document: EP Effective date: 20190228 |