WO2015137308A1 - Hollow fiber membrane module and manufacturing method therefor - Google Patents

Hollow fiber membrane module and manufacturing method therefor Download PDF

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Publication number
WO2015137308A1
WO2015137308A1 PCT/JP2015/056939 JP2015056939W WO2015137308A1 WO 2015137308 A1 WO2015137308 A1 WO 2015137308A1 JP 2015056939 W JP2015056939 W JP 2015056939W WO 2015137308 A1 WO2015137308 A1 WO 2015137308A1
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WO
WIPO (PCT)
Prior art keywords
hollow fiber
fiber membrane
case
membrane bundle
bundle
Prior art date
Application number
PCT/JP2015/056939
Other languages
French (fr)
Japanese (ja)
Inventor
板倉　正則
伊藤　正則
はつ美 竹田
Original Assignee
三菱レイヨン株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 三菱レイヨン株式会社 filed Critical 三菱レイヨン株式会社
Priority to JP2015515331A priority Critical patent/JP6079871B2/en
Priority to KR1020167027957A priority patent/KR20160130311A/en
Priority to CN201580024381.XA priority patent/CN106457156A/en
Publication of WO2015137308A1 publication Critical patent/WO2015137308A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/021—Manufacturing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/024—Hollow fibre modules with a single potted end
    • B01D63/0241—Hollow fibre modules with a single potted end being U-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/003—Membrane bonding or sealing
    • 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
    • B01D69/08—Hollow fibre membranes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/003—Processes for the treatment of water whereby the filtration technique is of importance using household-type filters for producing potable water, e.g. pitchers, bottles, faucet mounted devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B01D2313/042—Adhesives or glues
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/20—Specific housing
    • B01D2313/205—Specific housing characterised by the shape
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/006—Cartridges

Definitions

  • the present invention relates to a hollow fiber membrane module and a manufacturing method thereof.
  • This application claims priority based on Japanese Patent Application No. 2014-046873 filed in Japan on March 10, 2014, the contents of which are incorporated herein by reference.
  • water purifiers that purify tap water are generally used in homes and the like.
  • Many such water purifiers are known that use a hollow fiber membrane module as a filter medium.
  • a hollow fiber membrane module a hollow fiber membrane bundle formed by bending a large number of hollow fiber membranes is loaded into a cylindrical case, and a fixing resin is injected into the case, so that the hollow fiber membrane A device in which the side opposite to the bent portion of the bundle is fixed to the bottom of the case is known.
  • the hollow fiber membrane bundle loaded and accommodated in the case is generally a hollow fiber membrane bent in a U shape.
  • simply bending the hollow fiber membrane into a U-shape reduces the filling efficiency of the hollow fiber membrane and makes it difficult to improve the filtration performance, particularly when the hollow fiber membrane bundle is accommodated in a cylindrical case.
  • the shape of the hollow fiber membrane bundle in plan view is substantially rectangular or oval, and is straight in plan view.
  • a gap is formed between the portion and the inner surface of the case that is circular in plan view, and as a result, the filling efficiency is lowered.
  • the filling efficiency is lowered in this way, it is difficult to reduce the size of the module because it is necessary to obtain a predetermined filtration performance.
  • a hollow fiber membrane bundle is formed by bending a hollow fiber membrane into a U-shape, and the hollow fiber membrane bundle is twisted and accommodated in a case.
  • the filling efficiency is increased.
  • the hollow fiber membrane module of patent document 2 the hollow fiber membrane bundle which bent the hollow fiber membrane in the U-shape is divided
  • a bundle of many hollow fiber membranes is bent and twisted and stored in a case.
  • JP-A-6-142650 Japanese Utility Model Publication No. 7-24430 Japanese Patent Laid-Open No. 7-213872
  • the hollow fiber membrane module is formed by twisting the hollow fiber membrane bundle as in Patent Document 1 and Patent Document 3, the hollow fiber membranes are in close contact with each other at the twisted portion. It is not utilized, and therefore the filtration performance has not reached a sufficiently high level. In addition, the gap generated between the hollow fiber membrane bundle described above and the inner surface of the case remains without being eliminated.
  • a fixing resin is injected into the case and the side opposite to the bent portion of the hollow fiber membrane bundle is fixed to the bottom of the case.
  • the hollow fiber membrane bundle can be fixed to the bottom of the case and the sealing between the hollow fiber membranes can be uneven. Therefore, in order to securely fix and seal the bottom of the hollow fiber membrane bundle, Needs to be sufficiently thick (high). However, if the layer height of the fixing resin is made sufficiently thick in this way, downsizing of the hollow fiber membrane module is prevented accordingly.
  • the present invention has been made in view of the above circumstances, and provides a hollow fiber membrane module that improves the filtration performance by increasing the filling efficiency of the hollow fiber membrane into the case, and that can be miniaturized, and a method for manufacturing the same. With the goal.
  • a hollow fiber membrane module according to the present invention has a hollow fiber membrane bundle in which a large number of hollow fiber membranes are bent in a U-shape and is loaded in a cylindrical case, and is fixed in the case.
  • a hollow fiber membrane module in which resin is injected and the side opposite to the bent portion of the hollow fiber membrane bundle is fixed to the bottom of the case, the hollow fiber membrane being bent in a U shape in the case,
  • a void portion is formed at a substantially central portion of the hollow fiber membrane bundle along the height direction of the case, and a core rod is inserted through the void portion.
  • the hollow fiber membrane is bent in a U-shape in the case, and for example, formed so that the bending direction of the hollow fiber membrane faces a different direction without being aligned in a certain direction. Therefore, the planar shape can be formed in accordance with the planar shape of the case, and therefore the filling efficiency of the hollow fiber membrane into the case can be increased. Further, since a void is formed in the substantially central portion of the hollow fiber membrane bundle along the height direction of the case, and the core rod is inserted into the void, water easily flows into the void. Thereby, since water becomes easy to flow into the center part of a hollow fiber membrane bundle, the filtration flow rate increases and it becomes possible to filter water in a shorter time. In addition, since water easily flows into the center portion of the hollow fiber membrane bundle, it is possible to filter water while using the membrane area of the hollow fiber membrane more effectively.
  • the hollow fiber membrane bundle is bent in a U shape from a central portion of the case toward an inner wall portion.
  • the hollow fiber membranes are arranged radially from the center of the case. According to this structure, it becomes easy to form the said space
  • the core rod is preferably the tube for injecting the fixing resin.
  • the fixing resin is injected through the tube.
  • the fixing resin can be uniformly injected and filled in the bottom of the case.
  • the case is preferably cylindrical. According to this configuration, the hollow fiber membrane bundle can be loaded with almost no gap between the hollow fiber membrane bundle and the inner wall surface of the case by making the shape of the hollow fiber membrane bundle in a plan view circular.
  • the said hollow fiber membrane module WHEREIN may be formed by the small bundle divided
  • the method for producing a hollow fiber membrane module according to the present invention is to load a hollow fiber membrane bundle in which a number of hollow fiber membranes are bent into a U shape into a cylindrical case, and inject a fixing resin into the case.
  • a hollow fiber membrane bundle by bending it into a U-shape, providing a tube in the gap, and heat-cutting the opposite side of the hollow fiber membrane bundle to form a bottom portion Loading the hollow fiber membrane bundle having the bottom surface portion into a cylindrical case; injecting a fixing resin into the bottom side of the case through the tube; Fixing the bottom of the case to the bottom of the case Was cut by cutting the bottom portion side of the hollow fiber membrane bundle comprises the steps of exposing open ends of the hollow fiber membrane bundle, the.
  • the hollow fiber membrane bundle is formed into a U shape by bending the hollow fiber membrane bundle by the above method, so that the bending direction is not aligned in a certain direction. Since it can be formed so as to face in different directions, its planar shape can be formed in accordance with the planar shape of the case, and therefore the efficiency of filling the hollow fiber membrane into the case can be increased.
  • a hollow portion is formed in the substantially central portion of the hollow fiber membrane bundle, and a tube is provided in the hollow portion, and a fixing resin is injected into the bottom side of the case through the tube so that the bottom portion side of the hollow fiber membrane bundle is Since it is fixed to the bottom of the case, the fixing resin can be uniformly injected and filled into the bottom of the case.
  • the hollow fiber membrane module in the step of forming the hollow fiber membrane bundle, a large number of hollow fiber membranes are bent in a U shape from the center side toward the outside with the core rod as the center. At the same time, it is preferable that the hollow fiber membranes are radially arranged around the core rod and converged to form a hollow fiber membrane bundle. According to this configuration, it is easy to form the void portion at the substantially central portion of the hollow fiber membrane bundle by the core rod, and the shape of the hollow fiber membrane bundle in plan view can be easily made circular.
  • the step of forming the hollow fiber membrane bundle can also serve as the step of providing the tube in the gap, and thus the process can be simplified.
  • the tube in the step of providing the tube in the gap, it is preferable that the tube is inserted into the formed gap after removing the core rod from the hollow fiber membrane bundle.
  • an appropriate material capable of forming a desired void can be used as the core rod, and therefore, the step of forming the hollow fiber membrane bundle can be simplified.
  • the case is preferably cylindrical. According to this configuration, the hollow fiber membrane bundle can be loaded with almost no gap between the hollow fiber membrane bundle and the inner wall surface of the case by making the shape of the hollow fiber membrane bundle in a plan view circular.
  • the hollow fiber membrane bundle in the step of forming the hollow fiber membrane bundle, is formed by a small bundle divided into a plurality in a circumferential direction centering on the gap portion. It is preferable to do. According to this configuration, the membrane area can be increased by forming the hollow fiber membrane bundle with small bundles. Moreover, it becomes easy to form the said space
  • the filling efficiency of the hollow fiber membrane into the case can be increased by forming the hollow fiber membrane bundle according to the planar shape of the case, thereby increasing the efficiency of filling the hollow fiber membrane into the case.
  • the filtration performance can be improved.
  • the core rod is inserted into the gap formed along the height direction of the case at the substantially central portion of the hollow fiber membrane bundle, water can easily flow into the central portion of the hollow fiber membrane bundle.
  • the filtration flow rate increases, and it becomes possible to filter water in a shorter time, and it is possible to filter water while making more effective use of the membrane area of the hollow fiber membrane.
  • the fixing resin when a tube is employed as the core rod, the fixing resin can be uniformly injected and filled into the bottom of the case by injecting the fixing resin through the tube. Therefore, the layer height of the fixing resin can be made relatively thin (low), and thereby the hollow fiber membrane module can be miniaturized.
  • FIG. 1A and 1B It is a sectional side view showing a schematic structure of one embodiment of a hollow fiber membrane module concerning the present invention. It is a top view which shows schematic structure of one Embodiment of the hollow fiber membrane module which concerns on this invention. It is a perspective view which shows schematic structure of the hollow fiber membrane bundle used for the hollow fiber membrane module shown to FIG. 1A and 1B. It is a top view which shows schematic structure of the hollow fiber membrane bundle used for the hollow fiber membrane module shown to FIG. 1A and 1B. It is a figure for demonstrating the heat cutting process of a hollow fiber membrane bundle. It is a figure for demonstrating the loading process in the case of a hollow fiber membrane bundle. It is a figure for demonstrating the injection process of resin for fixing.
  • FIGS. 1A and 1B are diagrams showing a schematic configuration of an embodiment of a hollow fiber membrane module according to the present invention
  • FIG. 1A is a side sectional view
  • FIG. 1B is a plan view
  • 2A and 2B are diagrams showing a schematic configuration of a hollow fiber membrane bundle used in the hollow fiber membrane module shown in FIGS. 1A and 1B.
  • FIG. 2A is a perspective view
  • FIG. 2B is a plan view. It is.
  • reference numeral 1 denotes a hollow fiber membrane module.
  • a hollow fiber membrane bundle 2 is loaded in a cylindrical case 3, and the case 3 is fixed by a fixing resin 4. It is fixed to the bottom.
  • the hollow fiber membrane bundle 2 is formed in a substantially cylindrical shape (substantially cylindrical shape) by bending a large number of hollow fiber membranes 5 into a U shape as shown in FIGS. 2A and 2B. . That is, in the example described in the present embodiment, a large number of hollow fiber membranes 5 are bent in a U shape from the center (center) of the case 3 toward the inner wall as shown in FIGS. 1A and 2B. At the same time, the hollow fiber membrane 5 is arranged radially from the center of the case 3 so that it is formed in a substantially columnar shape (substantially cylindrical shape).
  • a hollow portion 6 is formed in the substantially central portion of the hollow fiber membrane bundle 2 along the central axis direction, and a center tube (tube) that functions as a core rod is formed in the void portion 6. 7 is inserted.
  • a core rod not only a tube-shaped thing but a solid core rod can also be used.
  • the hollow fiber membrane 5 constituting the hollow fiber membrane bundle 2 include various materials such as cellulose, polyolefin (polyethylene), polyvinyl alcohol, PMMA (polymethyl methacrylate), and polysulfone. Things are used.
  • a polysulfone-based hollow fiber membrane is suitably used as the hollow fiber membrane 5 because it is particularly excellent in water permeability and easy to manufacture.
  • the polyethylene-based hollow fiber membrane has a particularly high strength and elongation, for example, when bending into a U shape, the bending radius r can be reduced to increase the curvature, which is particularly effective when it is desired to increase the curvature. It is.
  • the hollow fiber membrane 5 is bent in a U shape from the central portion of the case 3 toward the inner wall portion, and therefore the curvature is relatively small (the bending radius r is relatively small). Therefore, a polysulfone-based hollow fiber membrane 5 excellent in water permeability and the like is used.
  • Such a hollow fiber membrane 5 is fixed on the bottom side of the case 3 with the fixing resin 4 as described above. That is, the space between the hollow fiber membranes 5 is sealed with the fixing resin 4, and the hollow fiber membranes 5 are liquid-tightly fixed to the inner wall surface of the bottom portion of the case 3.
  • the hollow fiber membrane 5 is opened on the bottom side of the case 3 in the state of being fixed by the fixing resin 4 as described above, and thus the opened end surface is exposed to the outside of the case 3.
  • the bent portion 2 a of the hollow fiber membrane bundle 2 formed by bending the hollow fiber membrane 5 into a U shape is arranged facing the side opposite to the bottom portion of the case 3.
  • the bent portion 2 a is disposed at a substantially central portion in the height direction of the case 3.
  • the hole diameter, porosity, film thickness, outer diameter, and the like of the hollow fiber membrane 5 forming the hollow fiber membrane bundle 2 are not particularly limited as long as the hollow fiber membrane 5 can be used as a filtration membrane.
  • the diameter is preferably about 20 to 4000 ⁇ m
  • the pore diameter is about 0.01 to 1 ⁇ m
  • the porosity is about 20 to 90%
  • the film thickness is preferably about 5 to 300 ⁇ m.
  • the case 3 may be made of any material having mechanical strength and durability.
  • polycarbonate polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, modified PPE (polyphenylene ether), etc. Is used.
  • the fixing resin an epoxy resin, an unsaturated polyester resin, a polyurethane resin, a silicone-based filler, various hot melt resins, and the like can be used, and these are appropriately selected and used.
  • the center tube 7 is a tubular member, and an annular flange portion 7 a is formed on one end side, that is, on the bent portion 2 a side of the hollow fiber membrane bundle 2.
  • the length of the center tube 7 is formed substantially equal to the height of the hollow fiber membrane bundle 2.
  • the surface on the other end side of the center tube 7, that is, the surface opposite to the flange portion 7a is an open end. In this way, the surface on the other end only needs to be open.
  • the center tube 7 also functions as a core rod that is inserted into the gap portion 6 formed in the hollow fiber membrane bundle 2.
  • a core rod such as a tube 7 is inserted into the gap 6 formed at the substantially central portion of the hollow fiber membrane bundle 2 as described above.
  • water easily flows into the center of the hollow fiber membrane bundle 2.
  • the filtration flow rate in the hollow fiber membrane bundle 2 increases, it becomes possible to filter water in a shorter time, and water is filtered while using the membrane area of the hollow fiber membrane 5 more effectively. Is possible.
  • the hollow fiber membrane module 1 having such a configuration will be described with reference to the same drawings as described above.
  • a large number of hollow fiber membranes 5 are bundled and bent into a U-shape so that a gap 6 is formed at a substantially central portion of the bundled hollow fiber membranes.
  • the hollow fiber membrane bundle 2 is formed such that the bending direction of the hollow fiber membranes 5 is not aligned in a certain direction while being bent in a U-shape. Is more preferable.
  • the void 6 is formed at the center of a hollow fiber membrane in which core rods (not shown) are bundled, and the hollow fiber membrane 5 is bent in a U shape from the center side to the outside.
  • the hollow fiber membranes 5 are radially arranged around the core rod and converged to form the hollow fiber membrane bundle 2.
  • the hollow fiber membrane 5 When the hollow fiber membrane 5 is bent into a U-shape, for example, a large number of hollow fiber membranes 5 bundled around the core rod are inserted into a cylindrical body with one end thereof open at the upper end together with the core rod. , Hold and fix. Subsequently, the other end of the hollow fiber membrane 5 is bent into a U shape. At that time, for example, a large number of hollow fiber membranes 5 are divided into four parts, bent from the center side (core bar side) to the outside, and along the outer surface of the cylindrical body. As a result, the hollow fiber membrane 5 divided into four can be bent substantially in four directions.
  • the hollow fiber membranes 5 divided into four parts and bent toward the four sides are brought closer to each other, and a large number of hollow fiber membranes 5 are oriented almost uniformly in all directions (360 °) around the core rod. Adjust and arrange radially. Thereby, the bending part 2a of the hollow fiber membrane bundle 2 is formed. Thereafter, a large number of hollow fiber membranes 5 are extracted from the cylindrical body to form a hollow fiber membrane bundle 2.
  • the core rod is removed, and the center tube 7 is inserted into the formed gap 6.
  • the hollow fiber membrane bundle 2 can be produced using the center tube 7 as a core rod.
  • the side opposite to the bent portion 2a of the hollow fiber membrane bundle 2 is heated and cut to form a bottom surface portion.
  • the hollow fiber membrane bundle 2 is accommodated in the accommodation hole 8a of the mold 8 in which the opening surface is formed with a circular accommodation hole 8a, and the side opposite to the bent portion 2a is accommodated.
  • An appropriate amount protrudes from the hole 8a, and in this state, the protruding portion of the hollow fiber membrane bundle 2 is heated and cut by the heat cutter 9. That is, the protruding portion of the hollow fiber membrane bundle 2 is heated and cut in a melted state.
  • hollow fiber membranes 5 glass fiber membrane bundles 2
  • a flat bottom surface portion 2b can be formed on the side opposite to the bent portions 2a of the hollow fiber membrane bundles 2.
  • many hollow fiber membranes 5 form the melt
  • the center tube 7 is moved to the bent portion 2a side of the hollow fiber membrane bundle 2 so as not to cut the center tube 7, and is protruded from the bent portion 2a side. Keep it.
  • the removal of the core rod from the hollow fiber membrane bundle 2 and the insertion of the center tube 7 into the gap 6 are performed before the heat cutting of the hollow fiber membrane bundle 2, You may make it carry out after the heat cutting of the hollow fiber membrane bundle 2.
  • the core bar is moved to the bent portion 2a side during the heat cutting so that the core bar does not interfere with the heat cutting of the hollow fiber membrane bundle 2.
  • the hollow fiber membrane bundle 2 having the bottom surface portion 2 b is loaded into a bottomed cylindrical case 10.
  • the bottom surface portion 2b is directed to the bottom surface side of the case 10 and loaded to the back (bottom) of the case 10, and the bottom surface portion 2b is brought into contact with the bottom surface (inner surface) of the case 10.
  • the center tube 7 that has been moved to the bent portion 2a side of the hollow fiber membrane bundle 2 before or after the hollow fiber membrane bundle 2 is loaded into the case 10 is pushed into the bottom surface portion 2b side (movement). )
  • the tip of the center tube 7 may be in contact with the bottom.
  • the center tube 7 may be arranged so as to be located on the bent portion 2a side, for example, about 2 to 10 mm from the surface of the bottom surface portion 2b.
  • the resin pot 11 is loaded into the case 10, and the discharge pipe 11 a is inserted into the flange portion 7 a of the center tube 7. Subsequently, the resin pot 11 is filled with a fixing resin 4a that is liquid before curing.
  • the viscosity of the fixing resin 4a which has been liquefied before curing is not particularly limited, but is preferably in the range of 300 to 5000 mPa ⁇ s, more preferably 500 to 3000 mPa ⁇ s. If the viscosity of the liquid fixing resin 4a is less than 300 mPa ⁇ s, the fixing resin 4a may flow to the opening end of the hollow fiber membrane 5 and block the inside of the opening end. On the other hand, when the viscosity of the fixing resin 4a exceeds 5000 mPa ⁇ s, good impregnation between the hollow fiber membranes 5 tends to be difficult, which is not preferable.
  • the case 10 is rotated by a centrifuge so that the bottom side of the case 10 is on the outside and the bent part 2a side of the hollow fiber membrane bundle 2 is on the inside, and centrifugal force is applied.
  • the liquid fixing resin 4 a in the resin pot 11 reaches the bottom side of the case 10 through the discharge pipe 11 a and the center tube 7. That is, the fixing resin 4 a is guided to the center tube 7 and injected into the bottom side of the case 10. Accordingly, the injected fixing resin 4a gradually rises from the bottom side of the case 10 to the bent portion 2a side of the hollow fiber membrane bundle 2, so that the case 10 and the hollow fiber membrane bundle 2 are each in between.
  • the hollow fiber membranes 5 are filled evenly.
  • the resin pot 11 is removed, and the fixing resin 4 a filled in the case 10 is cured to fix the bottom surface 2 b side of the hollow fiber membrane bundle 2 to the bottom of the case 10.
  • the bottom side of the case 10 is cut, and the bottom surface 2b side of the hollow fiber membrane bundle 2 is cut.
  • the cut surface of each hollow fiber membrane 5 is formed in the said bottom face part 2b side of the hollow fiber membrane bundle 2, ie, a cutting
  • the open ends of the hollow fiber membranes 5 are exposed, so that the open ends of the hollow fiber membrane bundles 2 are also exposed on the bottom side of the case 3 (10) whose bottom is open.
  • the hollow fiber membrane module 1 shown to FIG. 1A and FIG. 1B is obtained.
  • the hollow fiber membrane bundle 2 is formed so as to face different directions without being aligned in a constant direction.
  • the membrane bundle 2 is bent in a U shape from the center side toward the outside with the core rod as the center.
  • the hollow fiber membrane bundle 2 can be formed by radially arranging and concentrating the hollow fiber membrane bundle 2 around the core rod.
  • the planar shape of the hollow fiber membrane bundle 2 can be easily formed in accordance with the planar shape of the case 3. That is, the hollow fiber membrane bundle 2 can be formed in a substantially columnar shape (substantially cylindrical shape) circular in plan view with respect to the case 3 having a circular shape in plan view.
  • the hollow fiber membrane bundle 2 can be loaded in the case 3 without any gap, and thereby the efficiency of filling the hollow fiber membrane 5 into the case 3 is improved. Can be increased. Therefore, the filtration performance of the hollow fiber membrane module 1 can be improved.
  • a gap 6 is formed at substantially the center of the hollow fiber membrane bundle 2
  • a center tube 7 is provided in the gap 6, and a liquid fixing resin 4 a is injected into the bottom of the case 10 through the center tube 7. Since the bottom surface 2b side of the hollow fiber membrane bundle 2 is fixed to the bottom of the case 10, the fixing resin 4a can be uniformly injected and filled into the bottom of the case 10. Accordingly, there is no unevenness in fixing the hollow fiber membrane bundle 2 to the bottom of the case 10 and sealing between the hollow fiber membranes 5, so that the layer height of the fixing resin 4 (4a) is made relatively thin (low). However, the bottom part of the hollow fiber membrane bundle 2 can be reliably fixed and sealed. Therefore, the hollow fiber membrane module 1 obtained can be reduced in size.
  • the hollow fiber membrane bundle 2 is formed so that the planar shape of the hollow fiber membrane bundle 2 matches the planar shape of the case 3. 5 filling efficiency is increased, thus improving the filtration performance. Further, by injecting the fixing resin 4a through the center tube 7, the fixing resin 4a (4) is uniformly injected and filled in the bottom portion of the case 10 (3), so that the layer height of the fixing resin is relatively increased. Can be thin (lower). Therefore, the hollow fiber membrane module 1 can be downsized.
  • the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
  • a method using a core rod to form the gap portion 6 is described.
  • the tube 7 may be used.
  • the step (step) of forming the hollow fiber membrane bundle 2 can also serve as the step (step) of providing the center tube 7 in the gap 6, and therefore the process Can be simplified.
  • the hollow fiber membrane bundle 2 is formed as one large bundle.
  • the present invention is not limited to this.
  • FIG. As such a small bundle 12a, for example, as in the example shown in FIG. 6, the hollow fiber membrane 5 constituting this may be bent in a U shape and aligned in the same direction, or Similar to the hollow fiber membrane bundle 2, they may be arranged radially.
  • the hollow fiber membrane 5 constituting this is formed so that the bending direction of the hollow fiber membrane 5 faces different directions without being aligned in a certain direction. That is, the hollow fiber membrane bundle 12 is placed in the case 3 so that the directions of the small bundles 12a are different from each other.
  • the membrane area of the hollow fiber membrane bundle 12 can be increased, and thus the filtration performance can be improved.
  • the case for loading the hollow fiber membrane bundle is not limited to the cylindrical shape as shown in the figure, and for example, various cylindrical shapes such as a long cylindrical shape, an elliptical cylindrical shape, and a rectangular cylindrical shape are used. be able to.
  • the above-mentioned hollow fiber membrane module 1 can be made into the cartridge for water purifiers by filling the case 3 with activated carbon, for example. That is, the hollow fiber membrane module 1 which concerns on this invention becomes a member used suitably for manufacture of the cartridge for water purifiers (for example, refer the pot type water purifier 100 shown in FIG. 7).
  • a plurality of hollow fiber membranes 5 made of polysulfone having a yarn length (membrane width) of 65 mm (effective yarn length: 51 mm; potting length: 8 mm, cut length: 6 mm) are arranged on one end side thereof.
  • the hollow fiber membrane 5 is bent in a U-shape from the central portion of the cylindrical body toward the inner wall portion so that a gap portion 6 is formed in the central portion, and is substantially cylindrical so as to be radial from the central portion.
  • a hollow fiber membrane bundle 2 as shown in FIGS. 1A and 1B was formed.
  • the center tube 7 was inserted into the gap 6 formed by removing the core rod from the radial center of the hollow fiber membrane bundle 2 formed in a cylindrical shape.
  • the side opposite to the bent portion 2a of the hollow fiber membrane bundle 2 is heated and cut to form a bottom surface portion, and then the hollow fiber membrane bundle 2 with the center tube 7 inserted is formed into a cylindrical shape having an inner diameter of 40 mm.
  • Inserted into case 30 As shown in FIG. 7, an O-ring 34 for fixing the case 30 to a container 101 constituting a pot-type water purifier described later is attached to the upper side surface of the body portion 31 in the cylindrical axis direction.
  • the case 30 is provided with a bottom cover 32 whose tip is a small-diameter discharge port 32 a on the bottom surface side of the body portion 31, and at a position above the O-ring 34 in the body portion 31.
  • the case 3 is different from the case 3 shown in FIG. 1A and FIG. 1B in that an upper lid 33 having a plurality of holes 33a for taking in raw water to be treated is provided. Then, by injecting liquid fixing resin 4 a from the flange portion 7 a of the center tube 7, the bottom surface portion of the hollow fiber membrane bundle 2 was fixed to the bottom surface portion of the case 30 by curing the fixing resin 4 a. By such a process, a hollow fiber membrane module 1A as shown in FIG.
  • the specifications of the hollow fiber membrane module 1A were such that the filling rate of the hollow fiber membrane 5 in the case 30 was 49.1%, and the effective membrane area excluding the resin potting portion was 0.207 m 2 .
  • the hollow fiber membrane module 1A obtained in the above-described step (step) is filled with 25 g of 20-40 mesh granular activated carbon 110 to produce a water purifier cartridge A, which is used as the sample of the example. (See FIG. 7).
  • the cartridge for the water purifier of the above example except that the center tube (core bar) is not inserted into the gap 6 of the hollow fiber membrane bundle 2
  • a water purifier cartridge B having the same specifications as A was prepared.
  • the water purifier cartridge A which is an example, was produced by a method including a step of injecting the liquid fixing resin 4a from the center tube 7, whereas the water purifier cartridge B was produced. A method of opening a small hole in the side surface near the bottom of the case 3 and injecting the fixing resin 4a into the inside from the small hole was adopted.
  • the O-ring 34 provided in the upper part of the cartridge A for water purifiers or the cartridge B for water purifiers is used as a sealing member, and by attaching to the bottom part of the raw water storage part 102, the raw water stored in the raw water storage part 102 is each It flowed into the cartridges A and B for water purifiers, and the treated water was configured to flow into the purified water storage unit 103.
  • the cartridge B for water purifiers of a comparative example is equivalent to the following specifications of the hollow fiber membrane module A except that the center tube is not provided.
  • 1 L of raw water is put into the raw water storage unit 102, and this raw water flows into each of the water purifier cartridges A and B by its own weight and then flows out into the purified water storage unit 103, so that the raw water in the raw water storage unit 102 is
  • the filtration rate (initial filtration flow rate) was measured by measuring the time until it was completely eliminated. At this time, the filtration rate was measured by a method and conditions based on JIS S3201 (Japanese Industrial Standards: 2010 edition).
  • the water purifier cartridge A of the example had a filtration rate of 0.26 L / min, while the water purifier cartridge B of the comparative example had a filtration rate of 0.18 L / min. min. That is, the water purifier cartridge A of the example required about 4 minutes to filter 1 L of raw water, whereas the water purifier cartridge B of the comparative example 5 required 5 to filter 1 L of raw water. It takes more than 30 minutes. From this, it is clear that the filtration rate of raw water can be significantly improved by providing the hollow fiber membrane module 1A having the configuration according to the present invention.
  • the reason why the above-described effect can be obtained by the hollow fiber membrane module according to the present invention is that when raw water flows into the water purifier cartridge A (hollow fiber membrane module) from the raw water reservoir 102 by its own weight, the hollow fiber membrane bundle 2 It is conceivable that the core 6 (center tube 7) inserted into the gap 6 is expanded and the action of facilitating the flow of raw water is obtained.

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Abstract

This hollow fiber membrane module (1) is configured so that a hollow fiber membrane bundle (2), formed by bending multiple hollow fiber membranes (5) into a U-shape, is filled into a cylindrical case (3) and a fixing resin (4) is injected into the case (3) to fix the side of the hollow fiber membrane bundle (2) opposite a bent section (2a) thereof to the bottom of the case (3). The hollow fiber membranes (5) are bent into a U-shape inside of the case (3) and at a substantially central part of the hollow fiber membrane bundle (2), a void portion (6) is formed along the height direction of the case (3). A core rod is inserted into the void portion (6).

Description

中空糸膜モジュールとその製造方法Hollow fiber membrane module and manufacturing method thereof
　本発明は、中空糸膜モジュールとその製造方法に関する。
本出願は、２０１４年３月１０日に日本に出願された特願２０１４－０４６８７３号に基づき、優先権を主張し、その内容をここに援用する。 The present invention relates to a hollow fiber membrane module and a manufacturing method thereof.
This application claims priority based on Japanese Patent Application No. 2014-046873 filed in Japan on March 10, 2014, the contents of which are incorporated herein by reference.
　近年、各家庭などでは、水道水を浄化する浄水器が一般的に使用されている。このような浄水器としては、濾過材として中空糸膜モジュールを用いたものが多く知られている。
上記の中空糸膜モジュールとしては、多数本の中空糸膜を曲げて形成した中空糸膜束を、円筒状のケース内に装填し、このケース内に固定用樹脂を注入して前記中空糸膜束の曲げ部と反対の側を前記ケースの底部に固定したものが知られている。 In recent years, water purifiers that purify tap water are generally used in homes and the like. Many such water purifiers are known that use a hollow fiber membrane module as a filter medium.
As the hollow fiber membrane module, a hollow fiber membrane bundle formed by bending a large number of hollow fiber membranes is loaded into a cylindrical case, and a fixing resin is injected into the case, so that the hollow fiber membrane A device in which the side opposite to the bent portion of the bundle is fixed to the bottom of the case is known.
　ケース内に装填、収容される中空糸膜束としては、多数本の中空糸膜をＵ字状に曲げたものが一般的である。しかし、単に中空糸膜をＵ字状に曲げただけでは、特に、この中空糸膜束を円筒状のケースに収容した場合、中空糸膜の充填効率が低くなり、濾過性能を高めるのが難しくなる。すなわち、中空糸膜を単にＵ字状に曲げて中空糸膜束を形成した場合、この中空糸膜束の平面視形状は略矩形状や長円形状になるため、平面視して直線となる部位と平面視円形のケースの内面との間に空隙が形成され、結果として充填効率が低くなる。また、このように充填効率が低くなるため、所定の濾過性能を得る必要上、モジュールの小型化が困難になっている。 The hollow fiber membrane bundle loaded and accommodated in the case is generally a hollow fiber membrane bent in a U shape. However, simply bending the hollow fiber membrane into a U-shape reduces the filling efficiency of the hollow fiber membrane and makes it difficult to improve the filtration performance, particularly when the hollow fiber membrane bundle is accommodated in a cylindrical case. Become. That is, when a hollow fiber membrane bundle is formed by simply bending the hollow fiber membrane into a U-shape, the shape of the hollow fiber membrane bundle in plan view is substantially rectangular or oval, and is straight in plan view. A gap is formed between the portion and the inner surface of the case that is circular in plan view, and as a result, the filling efficiency is lowered. In addition, since the filling efficiency is lowered in this way, it is difficult to reduce the size of the module because it is necessary to obtain a predetermined filtration performance.
　そこで、特許文献１の浄水用カートリッジでは、中空糸膜をＵ字状に曲げて中空糸膜束を形成し、さらにこの中空糸膜束を捩ってケースに収容することにより、中空糸膜の充填効率を高めている。
　また、特許文献２の中空糸膜モジュールでは、中空糸膜をＵ字状に曲げた中空糸膜束を、複数に小分けして構成している。
　さらに、特許文献３の中空糸膜モジュールでは、多数本の中空糸膜の束を曲げ、かつ、ねじってケースに収納している。 Therefore, in the water purification cartridge of Patent Document 1, a hollow fiber membrane bundle is formed by bending a hollow fiber membrane into a U-shape, and the hollow fiber membrane bundle is twisted and accommodated in a case. The filling efficiency is increased.
Moreover, in the hollow fiber membrane module of patent document 2, the hollow fiber membrane bundle which bent the hollow fiber membrane in the U-shape is divided | segmented into plurality, and is comprised.
Furthermore, in the hollow fiber membrane module of Patent Document 3, a bundle of many hollow fiber membranes is bent and twisted and stored in a case.
特開平６－１４２６５０号公報JP-A-6-142650 実開平７－２４４３０号公報Japanese Utility Model Publication No. 7-24430 特開平７－２１３８７２号公報Japanese Patent Laid-Open No. 7-213872
　しかしながら、特許文献１や特許文献３のように中空糸膜束をねじって中空糸膜モジュールを形成した場合、ねじった部位で中空糸膜どうしが互いに密着するため、この密着部分が濾過に有効に活用されず、したがって、濾過性能が充分に高くなるまでには至っていない。
また、前述した中空糸膜束とケースの内面との間に発生する空隙も解消されずにそのまま残ってしまう。 However, when the hollow fiber membrane module is formed by twisting the hollow fiber membrane bundle as in Patent Document 1 and Patent Document 3, the hollow fiber membranes are in close contact with each other at the twisted portion. It is not utilized, and therefore the filtration performance has not reached a sufficiently high level.
In addition, the gap generated between the hollow fiber membrane bundle described above and the inner surface of the case remains without being eliminated.
　また、前述したように、中空糸膜モジュールを製造する場合、ケース内に固定用樹脂を注入して中空糸膜束の曲げ部と反対の側をケースの底部に固定するが、特許文献１～特許文献３のような中空糸膜モジュールでは、固定用樹脂の注入を、例えば、専用の治具を用いてケースの横などから行い、ケースの底部に充填する必要があり、したがって固定用樹脂をケースの径方向に均一に注入、充填するのが困難になる。 Further, as described above, when manufacturing a hollow fiber membrane module, a fixing resin is injected into the case and the side opposite to the bent portion of the hollow fiber membrane bundle is fixed to the bottom of the case. In the hollow fiber membrane module as disclosed in Patent Document 3, it is necessary to inject the fixing resin from the side of the case using a dedicated jig, for example, and fill the bottom of the case. It becomes difficult to uniformly fill and fill the case in the radial direction.
　そのため、ケースの底部に対する中空糸膜束の固定や、中空糸膜間の封止などにムラができることから、中空糸膜束の底部を確実に固定、封止するべく、固定用樹脂の層高を充分に厚く（高く）する必要がある。
　しかしながら、このように固定用樹脂の層高を充分に厚くすると、その分だけ、中空糸膜モジュールの小型化が阻まれてしまう。 Therefore, the hollow fiber membrane bundle can be fixed to the bottom of the case and the sealing between the hollow fiber membranes can be uneven. Therefore, in order to securely fix and seal the bottom of the hollow fiber membrane bundle, Needs to be sufficiently thick (high).
However, if the layer height of the fixing resin is made sufficiently thick in this way, downsizing of the hollow fiber membrane module is prevented accordingly.
　本発明は前記事情に鑑みてなされたもので、ケースに対する中空糸膜の充填効率を高めて濾過性能を向上するとともに、小型化を可能にした中空糸膜モジュールと、その製造方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and provides a hollow fiber membrane module that improves the filtration performance by increasing the filling efficiency of the hollow fiber membrane into the case, and that can be miniaturized, and a method for manufacturing the same. With the goal.
　前記目的を達成するため、本発明に係る中空糸膜モジュールは、多数本の中空糸膜をＵ字状に曲げた中空糸膜束を筒状のケース内に装填し、該ケース内に固定用樹脂を注入して前記中空糸膜束の曲げ部と反対の側を前記ケースの底部に固定した中空糸膜モジュールであって、前記中空糸膜は、前記ケース内でＵ字状に曲げられ、前記中空糸膜束の略中心部には前記ケースの高さ方向に沿って空隙部が形成され、前記空隙部には芯棒が挿通されている。 In order to achieve the above object, a hollow fiber membrane module according to the present invention has a hollow fiber membrane bundle in which a large number of hollow fiber membranes are bent in a U-shape and is loaded in a cylindrical case, and is fixed in the case. A hollow fiber membrane module in which resin is injected and the side opposite to the bent portion of the hollow fiber membrane bundle is fixed to the bottom of the case, the hollow fiber membrane being bent in a U shape in the case, A void portion is formed at a substantially central portion of the hollow fiber membrane bundle along the height direction of the case, and a core rod is inserted through the void portion.
　本発明の中空糸膜モジュールによれば、中空糸膜がケース内でＵ字状に曲げられており、例えば、中空糸膜の曲げ方向が一定方向に揃えられることなく異なる方向を向くように形成することができるので、その平面形状をケースの平面形状に合わせて形成することができ、したがって、ケースに対する中空糸膜の充填効率を高めることができる。
　また、中空糸膜束の略中心部にケースの高さ方向に沿って空隙部が形成され、この空隙部に芯棒が挿通されているので、空隙部に水が流入しやすくなる。これにより、中空糸膜束の中心部に水が流入し易くなることから、ろ過流量が増加し、より短い時間で水をろ過することが可能となる。また、中空糸膜束の中心部に水が流入し易くなることにより、中空糸膜の膜面積をより有効に利用しながら水を濾過することが可能となる。 According to the hollow fiber membrane module of the present invention, the hollow fiber membrane is bent in a U-shape in the case, and for example, formed so that the bending direction of the hollow fiber membrane faces a different direction without being aligned in a certain direction. Therefore, the planar shape can be formed in accordance with the planar shape of the case, and therefore the filling efficiency of the hollow fiber membrane into the case can be increased.
Further, since a void is formed in the substantially central portion of the hollow fiber membrane bundle along the height direction of the case, and the core rod is inserted into the void, water easily flows into the void. Thereby, since water becomes easy to flow into the center part of a hollow fiber membrane bundle, the filtration flow rate increases and it becomes possible to filter water in a shorter time. In addition, since water easily flows into the center portion of the hollow fiber membrane bundle, it is possible to filter water while using the membrane area of the hollow fiber membrane more effectively.
　また、前記中空糸膜モジュールにおいて、前記中空糸膜束は、前記ケースの中央部から内壁部に向けてＵ字状に曲げられることが好ましい。
また、前記中空糸膜モジュールにおいて、前記中空糸膜が前記ケースの中央部から放射状に配置されていることが好ましい。
　この構成によれば、中空糸膜束の略中心部に前記空隙部を形成するのが容易になり、さらに、中空糸膜束の平面視形状を容易に円形にすることができる。 Moreover, in the hollow fiber membrane module, it is preferable that the hollow fiber membrane bundle is bent in a U shape from a central portion of the case toward an inner wall portion.
In the hollow fiber membrane module, it is preferable that the hollow fiber membranes are arranged radially from the center of the case.
According to this structure, it becomes easy to form the said space | gap part in the approximate center part of a hollow fiber membrane bundle, and also the planar view shape of a hollow fiber membrane bundle can be made circular easily.
また、前記中空糸膜モジュールにおいて、前記芯棒は、前記固定用樹脂注入用のチューブであることが好ましい。
この構成によれば、製造時、ケース内に固定用樹脂を注入して中空糸膜束の曲げ部と反対の側をケースの底部に固定する際、前記チューブを通して固定用樹脂を注入することにより、ケースの底部に固定用樹脂を均一に注入、充填することができる。 In the hollow fiber membrane module, the core rod is preferably the tube for injecting the fixing resin.
According to this configuration, at the time of manufacturing, when the fixing resin is injected into the case and the side opposite to the bent portion of the hollow fiber membrane bundle is fixed to the bottom of the case, the fixing resin is injected through the tube. The fixing resin can be uniformly injected and filled in the bottom of the case.
　また、前記中空糸膜モジュールにおいて、前記ケースが円筒状であることが好ましい。
　この構成によれば、中空糸膜束の平面視形状を円形にすることにより、この中空糸膜束を、ケースの内壁面との間にほとんど隙間をあけることなく装填することができる。 In the hollow fiber membrane module, the case is preferably cylindrical.
According to this configuration, the hollow fiber membrane bundle can be loaded with almost no gap between the hollow fiber membrane bundle and the inner wall surface of the case by making the shape of the hollow fiber membrane bundle in a plan view circular.
　また、前記中空糸膜モジュールにおいて、前記中空糸膜束は、前記チューブを中心とした周方向にて複数に分割された小束によって形成されていてもよい。
　この構成によれば、中空糸膜束を小束によって形成したことでその膜面積を増加することができる。また、中空糸膜束の略中心部に前記空隙部を形成するのが容易になり、さらに、中空糸膜束の平面視形状をケースの平面視形状に合わせて適宜に形成することができる。 Moreover, the said hollow fiber membrane module WHEREIN: The said hollow fiber membrane bundle may be formed by the small bundle divided | segmented into plurality in the circumferential direction centering on the said tube.
According to this configuration, the membrane area can be increased by forming the hollow fiber membrane bundle with small bundles. Moreover, it becomes easy to form the said space | gap part in the approximate center part of a hollow fiber membrane bundle, Furthermore, the planar view shape of a hollow fiber membrane bundle can be suitably formed according to the planar view shape of a case.
　本発明の中空糸膜モジュールの製造方法は、多数本の中空糸膜をＵ字状に曲げた中空糸膜束を筒状のケース内に装填し、該ケース内に固定用樹脂を注入して前記中空糸膜束の曲げ部と反対の側を前記ケースの底部に固定する中空糸膜モジュールの製造方法であって、多数本の中空糸膜を、略中心部に空隙部が形成されるようにしてＵ字状に曲げて中空糸膜束を形成するステップと、前記空隙部にチューブを設けるステップと、前記中空糸膜束の曲げ部と反対の側を加熱切断して底面部を形成するステップと、前記底面部を形成した中空糸膜束を筒状のケース内に装填するステップと、前記チューブを通して前記ケースの底部側に固定用樹脂を注入し、前記中空糸膜束の底面部側を前記ケースの底部に固定するステップと、前記ケースの底部側を切断して前記中空糸膜束の底面部側を切断し、該中空糸膜束の開口端を露出させるステップと、を有する。 The method for producing a hollow fiber membrane module according to the present invention is to load a hollow fiber membrane bundle in which a number of hollow fiber membranes are bent into a U shape into a cylindrical case, and inject a fixing resin into the case. A method of manufacturing a hollow fiber membrane module in which a side opposite to a bent portion of the hollow fiber membrane bundle is fixed to a bottom portion of the case, wherein a plurality of hollow fiber membranes are formed so that a void portion is formed at a substantially central portion. And forming a hollow fiber membrane bundle by bending it into a U-shape, providing a tube in the gap, and heat-cutting the opposite side of the hollow fiber membrane bundle to form a bottom portion Loading the hollow fiber membrane bundle having the bottom surface portion into a cylindrical case; injecting a fixing resin into the bottom side of the case through the tube; Fixing the bottom of the case to the bottom of the case Was cut by cutting the bottom portion side of the hollow fiber membrane bundle comprises the steps of exposing open ends of the hollow fiber membrane bundle, the.
　本発明の中空糸膜モジュールの製造方法によれば、前記の方法により、中空糸膜束をＵ字状に曲げて中空糸膜束を形成することで、曲げ方向が一定方向に揃えられることなく異なる方向を向くように形成することが可能になるので、その平面形状をケースの平面形状に合わせて形成することができ、したがって、ケースに対する中空糸膜の充填効率を高めることができる。また、中空糸膜束の略中心部に空隙部を形成するとともに、この空隙部にチューブを設け、該チューブを通してケースの底部側に固定用樹脂を注入し、中空糸膜束の底面部側をケースの底部に固定するようにしたので、ケースの底部に固定用樹脂を均一に注入、充填することができる。 According to the method for producing a hollow fiber membrane module of the present invention, the hollow fiber membrane bundle is formed into a U shape by bending the hollow fiber membrane bundle by the above method, so that the bending direction is not aligned in a certain direction. Since it can be formed so as to face in different directions, its planar shape can be formed in accordance with the planar shape of the case, and therefore the efficiency of filling the hollow fiber membrane into the case can be increased. In addition, a hollow portion is formed in the substantially central portion of the hollow fiber membrane bundle, and a tube is provided in the hollow portion, and a fixing resin is injected into the bottom side of the case through the tube so that the bottom portion side of the hollow fiber membrane bundle is Since it is fixed to the bottom of the case, the fixing resin can be uniformly injected and filled into the bottom of the case.
　また、前記中空糸膜モジュールの製造方法において、前記中空糸膜束を形成するステップでは、多数本の中空糸膜を、芯棒を中心にして該中心側から外側に向けてＵ字状に曲げるとともに、前記中空糸膜を、前記芯棒を中心にして放射状に配置して集束し、中空糸膜束を形成することが好ましい。
　この構成によれば、芯棒によって中空糸膜束の略中心部に空隙部を形成するのが容易になり、さらに、中空糸膜束の平面視形状を容易に円形にすることができる。 In the method for manufacturing the hollow fiber membrane module, in the step of forming the hollow fiber membrane bundle, a large number of hollow fiber membranes are bent in a U shape from the center side toward the outside with the core rod as the center. At the same time, it is preferable that the hollow fiber membranes are radially arranged around the core rod and converged to form a hollow fiber membrane bundle.
According to this configuration, it is easy to form the void portion at the substantially central portion of the hollow fiber membrane bundle by the core rod, and the shape of the hollow fiber membrane bundle in plan view can be easily made circular.
　また、前記中空糸膜モジュールの製造方法においては、前記芯棒として、前記チューブを用いることが好ましい。
　この構成によれば、芯棒としてチューブを用いることにより、中空糸膜束を形成するステップによって空隙部にチューブを設けるステップを兼ねることができ、したがって、工程を簡略化することができる。 Moreover, in the manufacturing method of the said hollow fiber membrane module, it is preferable to use the said tube as said core rod.
According to this configuration, by using a tube as the core rod, the step of forming the hollow fiber membrane bundle can also serve as the step of providing the tube in the gap, and thus the process can be simplified.
　また、前記中空糸膜モジュールの製造方法において、前記空隙部にチューブを設けるステップでは、前記中空糸膜束から前記芯棒を外した後、形成された空隙部に前記チューブを挿通することが好ましい。
　この構成によれば、芯棒として所望の空隙部が形成可能な適宜なものを用いることができ、したがって、中空糸膜束を形成するステップを簡易化することができる。 Further, in the method for manufacturing the hollow fiber membrane module, in the step of providing the tube in the gap, it is preferable that the tube is inserted into the formed gap after removing the core rod from the hollow fiber membrane bundle. .
According to this configuration, an appropriate material capable of forming a desired void can be used as the core rod, and therefore, the step of forming the hollow fiber membrane bundle can be simplified.
　また、前記中空糸膜モジュールの製造方法においては、前記ケースが円筒状であることが好ましい。
　この構成によれば、中空糸膜束の平面視形状を円形にすることにより、この中空糸膜束を、ケースの内壁面との間にほとんど隙間をあけることなく装填することができる。 In the method for manufacturing the hollow fiber membrane module, the case is preferably cylindrical.
According to this configuration, the hollow fiber membrane bundle can be loaded with almost no gap between the hollow fiber membrane bundle and the inner wall surface of the case by making the shape of the hollow fiber membrane bundle in a plan view circular.
　また、前記中空糸膜モジュールの製造方法において、前記中空糸膜束を形成するステップでは、前記中空糸膜束を、前記空隙部を中心とした周方向にて複数に分割された小束によって形成することが好ましい。
　この構成によれば、中空糸膜束を小束によって形成することでその膜面積を増加することができる。また、中空糸膜束の略中心部に前記空隙部を形成するのが容易になり、さらに、中空糸膜束の平面視形状をケースの平面視形状に合わせて適宜に形成することができる。 Further, in the method of manufacturing the hollow fiber membrane module, in the step of forming the hollow fiber membrane bundle, the hollow fiber membrane bundle is formed by a small bundle divided into a plurality in a circumferential direction centering on the gap portion. It is preferable to do.
According to this configuration, the membrane area can be increased by forming the hollow fiber membrane bundle with small bundles. Moreover, it becomes easy to form the said space | gap part in the approximate center part of a hollow fiber membrane bundle, Furthermore, the planar view shape of a hollow fiber membrane bundle can be suitably formed according to the planar view shape of a case.
　本発明の中空糸膜モジュールとその製造方法によれば、中空糸膜束の平面形状をケースの平面形状に合わせて形成することにより、ケースに対する中空糸膜の充填効率を高めることができ、したがって、濾過性能を向上することができる。また、中空糸膜束の略中心部にケースの高さ方向に沿って形成された空隙部に芯棒が挿通されているので、中空糸膜束の中心部に水が流入し易くなることから、ろ過流量が増加し、より短い時間で水をろ過することが可能になり、また、中空糸膜の膜面積をより有効に利用しながら水を濾過することが可能となる。
さらに、芯棒としてチューブを採用した場合には、これを通して固定用樹脂を注入することにより、ケースの底部に固定用樹脂を均一に注入、充填することができる。したがって、固定用樹脂の層高を比較的薄く（低く）することができ、これによって中空糸膜モジュールの小型化を可能にすることができる。 According to the hollow fiber membrane module and the manufacturing method thereof of the present invention, the filling efficiency of the hollow fiber membrane into the case can be increased by forming the hollow fiber membrane bundle according to the planar shape of the case, thereby increasing the efficiency of filling the hollow fiber membrane into the case. The filtration performance can be improved. In addition, since the core rod is inserted into the gap formed along the height direction of the case at the substantially central portion of the hollow fiber membrane bundle, water can easily flow into the central portion of the hollow fiber membrane bundle. The filtration flow rate increases, and it becomes possible to filter water in a shorter time, and it is possible to filter water while making more effective use of the membrane area of the hollow fiber membrane.
Further, when a tube is employed as the core rod, the fixing resin can be uniformly injected and filled into the bottom of the case by injecting the fixing resin through the tube. Therefore, the layer height of the fixing resin can be made relatively thin (low), and thereby the hollow fiber membrane module can be miniaturized.
本発明に係る中空糸膜モジュールの一実施形態の概略構成を示す側断面図である。It is a sectional side view showing a schematic structure of one embodiment of a hollow fiber membrane module concerning the present invention. 本発明に係る中空糸膜モジュールの一実施形態の概略構成を示す平面図である。It is a top view which shows schematic structure of one Embodiment of the hollow fiber membrane module which concerns on this invention. 図１Ａ及び図１Ｂに示した中空糸膜モジュールに用いられる中空糸膜束の概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the hollow fiber membrane bundle used for the hollow fiber membrane module shown to FIG. 1A and 1B. 図１Ａ及び図１Ｂに示した中空糸膜モジュールに用いられる中空糸膜束の概略構成を示す平面図である。It is a top view which shows schematic structure of the hollow fiber membrane bundle used for the hollow fiber membrane module shown to FIG. 1A and 1B. 中空糸膜束の加熱切断処理を説明するための図である。It is a figure for demonstrating the heat cutting process of a hollow fiber membrane bundle. 中空糸膜束のケース内への装填処理を説明するための図である。It is a figure for demonstrating the loading process in the case of a hollow fiber membrane bundle. 固定用樹脂の注入処理を説明するための図である。It is a figure for demonstrating the injection process of resin for fixing. 中空糸膜束の変形例を示す平面図である。It is a top view which shows the modification of a hollow fiber membrane bundle. 本発明に係る中空糸膜モジュールの実施例について説明する図であり、中空糸膜モジュールを容器内に設置してポット型浄水器を構成した状態を示す断面図である。It is a figure explaining the Example of the hollow fiber membrane module which concerns on this invention, and is sectional drawing which shows the state which installed the hollow fiber membrane module in the container and comprised the pot type water purifier.
　以下、本発明に係る中空糸膜モジュールとその製造方法について、図面を参照して詳しく説明する。
　図１Ａ、及び図１Ｂは、本発明に係る中空糸膜モジュールの一実施形態の概略構成を示す図であり、図１Ａは側断面図、図１Ｂは平面図である。また、図２Ａ、及び図２Ｂは、図１Ａ、及び図１Ｂに示した中空糸膜モジュールに用いられる中空糸膜束の概略構成を示す図であり、図２Ａは斜視図、図２Ｂは平面図である。 Hereinafter, a hollow fiber membrane module according to the present invention and a manufacturing method thereof will be described in detail with reference to the drawings.
1A and 1B are diagrams showing a schematic configuration of an embodiment of a hollow fiber membrane module according to the present invention, FIG. 1A is a side sectional view, and FIG. 1B is a plan view. 2A and 2B are diagrams showing a schematic configuration of a hollow fiber membrane bundle used in the hollow fiber membrane module shown in FIGS. 1A and 1B. FIG. 2A is a perspective view, and FIG. 2B is a plan view. It is.
　図１Ａ、及び図１Ｂにおいて符号１は中空糸膜モジュールであり、この中空糸膜モジュール１は、中空糸膜束２が円筒状のケース３内に装填され、固定用樹脂４によって該ケース３の底部に固定されたものである。
　中空糸膜束２は、図２Ａ、及び図２Ｂに示すように多数本の中空糸膜５がＵ字状に曲げられたことにより、略円柱状（略円筒状）に形成されたものである。すなわち、本実施形態で説明する例では、多数本の中空糸膜５が、図１Ａ、及び図２Ｂに示すようにケース３の中央部（中心部）から内壁部に向けてＵ字状に曲げられるとともに、該中空糸膜５がケース３の中央部から放射状に配置されたことにより、略円柱状（略円筒状）に形成されている。 1A and 1B, reference numeral 1 denotes a hollow fiber membrane module. In this hollow fiber membrane module 1, a hollow fiber membrane bundle 2 is loaded in a cylindrical case 3, and the case 3 is fixed by a fixing resin 4. It is fixed to the bottom.
The hollow fiber membrane bundle 2 is formed in a substantially cylindrical shape (substantially cylindrical shape) by bending a large number of hollow fiber membranes 5 into a U shape as shown in FIGS. 2A and 2B. . That is, in the example described in the present embodiment, a large number of hollow fiber membranes 5 are bent in a U shape from the center (center) of the case 3 toward the inner wall as shown in FIGS. 1A and 2B. At the same time, the hollow fiber membrane 5 is arranged radially from the center of the case 3 so that it is formed in a substantially columnar shape (substantially cylindrical shape).
　また、このような中空糸膜束２の略中央部には、中心軸方向に沿って空隙部６が形成されており、この空隙部６には、芯棒として機能する、センターチューブ（チューブ）７が挿通されている。また、芯棒としては、チューブ状のもののみならず、中実の芯棒を用いることもできる。
　中空糸膜束２を構成する中空糸膜５としては、例えば、セルロース系、ポリオレフィン系（ポリエチレン系）、ポリビニルアルコール系、ＰＭＭＡ（ポリメタクリル酸メチル）系、ポリスルフォン系など、種々の材科のものが使用される。本実施形態では、中空糸膜５として、特に透水性に優れ、製造も容易である等の理由により、ポリスルフォン系の中空糸膜が好適に用いられる。 In addition, a hollow portion 6 is formed in the substantially central portion of the hollow fiber membrane bundle 2 along the central axis direction, and a center tube (tube) that functions as a core rod is formed in the void portion 6. 7 is inserted. Moreover, as a core rod, not only a tube-shaped thing but a solid core rod can also be used.
Examples of the hollow fiber membrane 5 constituting the hollow fiber membrane bundle 2 include various materials such as cellulose, polyolefin (polyethylene), polyvinyl alcohol, PMMA (polymethyl methacrylate), and polysulfone. Things are used. In the present embodiment, a polysulfone-based hollow fiber membrane is suitably used as the hollow fiber membrane 5 because it is particularly excellent in water permeability and easy to manufacture.
　なお、ポリエチレン系の中空糸膜は特に強伸度が高く、例えば、Ｕ字状に曲げる際、屈曲半径ｒを小さくして曲率を大きくすることができるため、特に曲率を大きくしたい場合には有効である。ただし、本実施形態では、前述したように、中空糸膜５をケース３の中央部から内壁部に向けてＵ字状に曲げており、したがって曲率を比較的小さくする（屈曲半径ｒを比較的大きくする）ことができるため、透水性等に優れたポリスルフォン系の中空糸膜５が用いられている。 In addition, the polyethylene-based hollow fiber membrane has a particularly high strength and elongation, for example, when bending into a U shape, the bending radius r can be reduced to increase the curvature, which is particularly effective when it is desired to increase the curvature. It is. However, in the present embodiment, as described above, the hollow fiber membrane 5 is bent in a U shape from the central portion of the case 3 toward the inner wall portion, and therefore the curvature is relatively small (the bending radius r is relatively small). Therefore, a polysulfone-based hollow fiber membrane 5 excellent in water permeability and the like is used.
　このような中空糸膜５は、ケース３の底部側にて、前述したように固定用樹脂４によって固定されている。すなわち、中空糸膜５間が固定用樹脂４によって封止されるとともに、これら中空糸膜５がケース３の底部内壁面に液密に固定されている。そして、このように固定用樹脂４によって固定された状態で、中空糸膜５はケース３の底部側にて開口しており、したがって、開口した端面がケース３の外方に露出している。 Such a hollow fiber membrane 5 is fixed on the bottom side of the case 3 with the fixing resin 4 as described above. That is, the space between the hollow fiber membranes 5 is sealed with the fixing resin 4, and the hollow fiber membranes 5 are liquid-tightly fixed to the inner wall surface of the bottom portion of the case 3. The hollow fiber membrane 5 is opened on the bottom side of the case 3 in the state of being fixed by the fixing resin 4 as described above, and thus the opened end surface is exposed to the outside of the case 3.
　つまり、中空糸膜束２は、その底面がケース３の底部にて外方に露出している。また、中空糸膜５がＵ字状に曲げられたことで形成された中空糸膜束２の曲げ部２ａは、ケース３の底部と反対の側を向いて配置されている。本実施形態では、曲げ部２ａはケース３の高さ方向略中央部に配置されている。 That is, the bottom surface of the hollow fiber membrane bundle 2 is exposed outward at the bottom of the case 3. Further, the bent portion 2 a of the hollow fiber membrane bundle 2 formed by bending the hollow fiber membrane 5 into a U shape is arranged facing the side opposite to the bottom portion of the case 3. In the present embodiment, the bent portion 2 a is disposed at a substantially central portion in the height direction of the case 3.
　中空糸膜束２を形成する中空糸膜５の孔径、空孔率、膜厚、外径等は、中空糸膜５を濾過膜として使用可能な寸法であれば特に限定されないものの、例えば、外径は２０～４０００μｍ程度、孔径は０．０１～１μｍ程度、空孔率は２０～９０％程度、膜厚は５～３００μｍ程度であるのが好ましい。 The hole diameter, porosity, film thickness, outer diameter, and the like of the hollow fiber membrane 5 forming the hollow fiber membrane bundle 2 are not particularly limited as long as the hollow fiber membrane 5 can be used as a filtration membrane. The diameter is preferably about 20 to 4000 μm, the pore diameter is about 0.01 to 1 μm, the porosity is about 20 to 90%, and the film thickness is preferably about 5 to 300 μm.
　ケース３の材質としては、機械的強度および耐久性を有するものであればよく、例えば、ポリカーボネート、ポリスルフォン、ポリオレフィン、ＰＶＣ（ポリ塩化ビニル）、アクリル樹脂、ＡＢＳ樹脂、変成ＰＰＥ（ポリフェニレンエーテル）等が用いられる。 The case 3 may be made of any material having mechanical strength and durability. For example, polycarbonate, polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, modified PPE (polyphenylene ether), etc. Is used.
　固定樹脂としては、エポキシ樹脂、不飽和ポリエステル樹脂、ポリウレタン樹脂、シリコーン系充填材、各種ホットメルト樹脂等が使用可能であり、これらの中から適宜選択され、用いられる。 As the fixing resin, an epoxy resin, an unsaturated polyester resin, a polyurethane resin, a silicone-based filler, various hot melt resins, and the like can be used, and these are appropriately selected and used.
　センターチューブ７は、円管状の部材であり、一端側、すなわち中空糸膜束２の曲げ部２ａ側に円環状のフランジ部７ａが形成されている。センターチューブ７の長さは、中空糸膜束２の高さと略等しく形成されている。また、センターチューブ７の他端側の面、すなわち前記フランジ部７ａと反対の側の面は開口端とされている。このように、他端側の面は開口していれば良いが、図４、図５に示すように、センターチューブ７の軸線に対して所定の鋭角角度、例えば３０°～７０°の角度で傾斜した傾斜面に形成されていると、より好ましい。ここで、本実施形態の中空糸膜モジュール１においては、センターチューブ７は、中空糸膜束２に形成された空隙部６に挿通される芯棒としても機能する。 The center tube 7 is a tubular member, and an annular flange portion 7 a is formed on one end side, that is, on the bent portion 2 a side of the hollow fiber membrane bundle 2. The length of the center tube 7 is formed substantially equal to the height of the hollow fiber membrane bundle 2. The surface on the other end side of the center tube 7, that is, the surface opposite to the flange portion 7a is an open end. In this way, the surface on the other end only needs to be open. However, as shown in FIGS. 4 and 5, at a predetermined acute angle with respect to the axis of the center tube 7, for example, an angle of 30 ° to 70 °. More preferably, it is formed on an inclined surface. Here, in the hollow fiber membrane module 1 of the present embodiment, the center tube 7 also functions as a core rod that is inserted into the gap portion 6 formed in the hollow fiber membrane bundle 2.
本実施形態の中空糸膜モジュール１によれば、前述の構成のように、中空糸膜束２の略中心部に形成された空隙部６に、例えば、チューブ７のような芯棒が挿通されることにより、中空糸膜束２の中心部に水が流入し易くなる。これにより、中空糸膜束２におけるろ過流量が増加し、より短い時間で水をろ過することが可能になり、また、中空糸膜５の膜面積をより有効に利用しながら水を濾過することが可能となる。 According to the hollow fiber membrane module 1 of the present embodiment, for example, a core rod such as a tube 7 is inserted into the gap 6 formed at the substantially central portion of the hollow fiber membrane bundle 2 as described above. As a result, water easily flows into the center of the hollow fiber membrane bundle 2. Thereby, the filtration flow rate in the hollow fiber membrane bundle 2 increases, it becomes possible to filter water in a shorter time, and water is filtered while using the membrane area of the hollow fiber membrane 5 more effectively. Is possible.
　次に、このような構成からなる中空糸膜モジュール１の製造方法を、前記と同じ図面を参照して説明する。
　まず、多数本の中空糸膜５を束ね、束ねた中空糸膜の略中心部に空隙部６が形成されるようにしてＵ字状に曲げる。また、本実施形態の製造方法では、これら中空糸膜５をＵ字状に曲げながら、その曲げ方向が一定方向に揃えられることなく異なる方向を向くようにして中空糸膜束２を形成することがより好ましい。具体的には、例えば、芯棒（図示せず）を束ねた中空糸膜の中心にして空隙部６を形成させ、該中心側から外側に向けて中空糸膜５をＵ字状に曲げるとともに、該中空糸膜５を、前記芯棒を中心にして放射状に配置して集束し、中空糸膜束２を形成する。 Next, a method for manufacturing the hollow fiber membrane module 1 having such a configuration will be described with reference to the same drawings as described above.
First, a large number of hollow fiber membranes 5 are bundled and bent into a U-shape so that a gap 6 is formed at a substantially central portion of the bundled hollow fiber membranes. Further, in the manufacturing method of the present embodiment, the hollow fiber membrane bundle 2 is formed such that the bending direction of the hollow fiber membranes 5 is not aligned in a certain direction while being bent in a U-shape. Is more preferable. Specifically, for example, the void 6 is formed at the center of a hollow fiber membrane in which core rods (not shown) are bundled, and the hollow fiber membrane 5 is bent in a U shape from the center side to the outside. The hollow fiber membranes 5 are radially arranged around the core rod and converged to form the hollow fiber membrane bundle 2.
　中空糸膜５をＵ字状に曲げる際には、例えば、芯棒を中心にして束ねた多数本の中空糸膜５を、その一端側を、上端が開口した円筒体内に芯棒とともに挿入し、保持固定する。続いて、中空糸膜５の他端側をＵ字状に曲げる。その際、例えば、多数本の中空糸膜５を４分割し、それぞれ中心側（芯棒側）から外側に曲げ、円筒体の外面に沿わせる。これによって、４分割した中空糸膜５を、ほぼ四方に向けて曲げることができる。次いで、４分割し、四方に向けて曲げた中空糸膜５間を互いに寄せ、多数本の中空糸膜５が、芯棒を中心にして全方位（３６０°）にほぼ均等に向くように、放射状に調整し、配置する。これにより、中空糸膜束２の曲げ部２ａを形成する。その後、多数本の中空糸膜５を円筒体から抜き取り、中空糸膜束２とする。 When the hollow fiber membrane 5 is bent into a U-shape, for example, a large number of hollow fiber membranes 5 bundled around the core rod are inserted into a cylindrical body with one end thereof open at the upper end together with the core rod. , Hold and fix. Subsequently, the other end of the hollow fiber membrane 5 is bent into a U shape. At that time, for example, a large number of hollow fiber membranes 5 are divided into four parts, bent from the center side (core bar side) to the outside, and along the outer surface of the cylindrical body. As a result, the hollow fiber membrane 5 divided into four can be bent substantially in four directions. Next, the hollow fiber membranes 5 divided into four parts and bent toward the four sides are brought closer to each other, and a large number of hollow fiber membranes 5 are oriented almost uniformly in all directions (360 °) around the core rod. Adjust and arrange radially. Thereby, the bending part 2a of the hollow fiber membrane bundle 2 is formed. Thereafter, a large number of hollow fiber membranes 5 are extracted from the cylindrical body to form a hollow fiber membrane bundle 2.
　また、このように多数本の中空糸膜５を円筒体から抜き取る前に、あるいは抜き取った後、芯棒を外し、形成された空隙部６にセンターチューブ７を挿通する。
なお、本発明においては、詳細を後述するように、芯棒としてセンターチューブ７を用いて中空糸膜束２を作製することも可能である。 Further, before or after removing a large number of hollow fiber membranes 5 from the cylindrical body, the core rod is removed, and the center tube 7 is inserted into the formed gap 6.
In the present invention, as will be described in detail later, the hollow fiber membrane bundle 2 can be produced using the center tube 7 as a core rod.
　次に、中空糸膜束２の曲げ部２ａと反対の側を加熱切断し、底面部を形成する。具体的には、図３に示すように、開口面が円形の収容孔８ａを形成した型８の前記収容孔８ａ内に中空糸膜束２を収容し、曲げ部２ａと反対の側を収容孔８ａから適宜量突出させておき、その状態で、ヒートカッター９によって中空糸膜束２の突出した部位を加熱切断する。すなわち、中空糸膜束２の突出部位を加熱し、溶融させた状態で切断する。このようにして中空糸膜５（中空糸膜束２）の端部を切り揃えることにより、中空糸膜束２の曲げ部２ａと反対の側に平面状の底面部２ｂを形成することができる。なお、このように加熱切断することにより、多数本の中空糸膜５は、加熱切断部となる底面部２ｂにおいて、互いに融着してなる融着面を形成する。 Next, the side opposite to the bent portion 2a of the hollow fiber membrane bundle 2 is heated and cut to form a bottom surface portion. Specifically, as shown in FIG. 3, the hollow fiber membrane bundle 2 is accommodated in the accommodation hole 8a of the mold 8 in which the opening surface is formed with a circular accommodation hole 8a, and the side opposite to the bent portion 2a is accommodated. An appropriate amount protrudes from the hole 8a, and in this state, the protruding portion of the hollow fiber membrane bundle 2 is heated and cut by the heat cutter 9. That is, the protruding portion of the hollow fiber membrane bundle 2 is heated and cut in a melted state. In this way, by flattening the ends of the hollow fiber membranes 5 (hollow fiber membrane bundles 2), a flat bottom surface portion 2b can be formed on the side opposite to the bent portions 2a of the hollow fiber membrane bundles 2. . In addition, by carrying out heat cutting | disconnection in this way, many hollow fiber membranes 5 form the melt | fusion surface formed by mutually fuse | melting in the bottom face part 2b used as a heat cutting part.
　ここで、この中空糸膜束２の加熱切断時には、センターチューブ７を切断しないように、該センターチューブ７を中空糸膜束２の曲げ部２ａ側に移動させ、この曲げ部２ａ側から突出させておく。
　なお、前述した手順においては、中空糸膜束２からの芯棒の取り外し、空隙部６へのセンターチューブ７の挿通を、中空糸膜束２の加熱切断時の前に行うようにしたが、中空糸膜束２の加熱切断後に行うようにしてもよい。その場合にも、芯棒が中空糸膜束２の加熱切断に干渉しないよう、加熱切断時には芯棒を前記曲げ部２ａ側に移動させておく。 Here, when the hollow fiber membrane bundle 2 is heated and cut, the center tube 7 is moved to the bent portion 2a side of the hollow fiber membrane bundle 2 so as not to cut the center tube 7, and is protruded from the bent portion 2a side. Keep it.
In the above-described procedure, the removal of the core rod from the hollow fiber membrane bundle 2 and the insertion of the center tube 7 into the gap 6 are performed before the heat cutting of the hollow fiber membrane bundle 2, You may make it carry out after the heat cutting of the hollow fiber membrane bundle 2. FIG. Also in this case, the core bar is moved to the bent portion 2a side during the heat cutting so that the core bar does not interfere with the heat cutting of the hollow fiber membrane bundle 2.
　次いで、図４に示すように、前記の底面部２ｂを形成した中空糸膜束２を有底円筒状のケース１０内に装填する。その際、底面部２ｂをケース１０の底面側に向けて、ケース１０の奥（底）まで装填し、この底面部２ｂをケース１０の底面（内面）に当接させる。 Next, as shown in FIG. 4, the hollow fiber membrane bundle 2 having the bottom surface portion 2 b is loaded into a bottomed cylindrical case 10. At that time, the bottom surface portion 2b is directed to the bottom surface side of the case 10 and loaded to the back (bottom) of the case 10, and the bottom surface portion 2b is brought into contact with the bottom surface (inner surface) of the case 10.
　また、中空糸膜束２をケース１０内に装填する前に、あるいは装填後、中空糸膜束２の曲げ部２ａ側に移動させていたセンターチューブ７を、底面部２ｂ側に押し入れる（移動させる）。その際、図４に示すように、センターチューブ７の他端側の面を傾斜面として形成している場合には、センターチューブ７の先端は底部と接しても良い。また、底面部２ｂの面より、例えば２～１０ｍｍ程度、曲げ部２ａ側に位置するように、このセンターチューブ７を配置しても良い。このように、センターチューブ７の先端を底面部２ｂよりも浮かして配置することにより、後述するように、固定用樹脂を注入する際、融着面となっている底面部２ｂよりも少し上側に固定用樹脂を供給することができるので、固定用樹脂の充填性を高めることが可能になる。 The center tube 7 that has been moved to the bent portion 2a side of the hollow fiber membrane bundle 2 before or after the hollow fiber membrane bundle 2 is loaded into the case 10 is pushed into the bottom surface portion 2b side (movement). ) In that case, as shown in FIG. 4, when the surface of the other end side of the center tube 7 is formed as an inclined surface, the tip of the center tube 7 may be in contact with the bottom. In addition, the center tube 7 may be arranged so as to be located on the bent portion 2a side, for example, about 2 to 10 mm from the surface of the bottom surface portion 2b. In this way, by disposing the tip of the center tube 7 so as to float above the bottom surface portion 2b, as will be described later, when injecting the fixing resin, it is slightly above the bottom surface portion 2b serving as the fusion surface. Since the fixing resin can be supplied, the filling property of the fixing resin can be improved.
　次いで、図５に示すように、樹脂ポット１１をケース１０内に装填し、その排出管１１ａをセンターチューブ７のフランジ部７ａ内に差し込む。続いて、樹脂ポット１１内に、硬化前で液状とされた固定用樹脂４ａを充填する。硬化前で液状とされた固定用樹脂４ａの粘度については、特に限定はされないものの、好ましくは３００～５０００ｍＰａ・ｓ、より好ましくは５００～３０００ｍＰａ・ｓの範囲とされる。液状の固定用樹脂４ａの粘度が３００ｍＰａ・ｓ未満では、固定用樹脂４ａが中空糸膜５の開口端部まで流動し、この開口端部内を閉塞するおそれがある。また、固定用樹脂４ａの粘度が５０００ｍＰａ・ｓを超えると、中空糸膜５間への良好な含浸が難しくなる傾向にあり、好ましくない。 Next, as shown in FIG. 5, the resin pot 11 is loaded into the case 10, and the discharge pipe 11 a is inserted into the flange portion 7 a of the center tube 7. Subsequently, the resin pot 11 is filled with a fixing resin 4a that is liquid before curing. The viscosity of the fixing resin 4a which has been liquefied before curing is not particularly limited, but is preferably in the range of 300 to 5000 mPa · s, more preferably 500 to 3000 mPa · s. If the viscosity of the liquid fixing resin 4a is less than 300 mPa · s, the fixing resin 4a may flow to the opening end of the hollow fiber membrane 5 and block the inside of the opening end. On the other hand, when the viscosity of the fixing resin 4a exceeds 5000 mPa · s, good impregnation between the hollow fiber membranes 5 tends to be difficult, which is not preferable.
　次いで、ケース１０の底面側が外側、中空糸膜束２の曲げ部２ａ側が内側になるような配置で、このケース１０を遠心機によって回転させ、遠心力を付与する。この遠心力により、樹脂ポット１１内の液状の固定用樹脂４ａは、排出管１１ａ、センターチューブ７を通ってケース１０の底部側に達する。すなわち、固定用樹脂４ａがセンターチューブ７に案内されてケース１０の底部側に注入される。したがって、注入された固定用樹脂４ａは、ケース１０の底部側から徐々に中空糸膜束２の曲げ部２ａ側に上昇することで、ケース１０と中空糸膜束２との間や、各々の中空糸膜５間に、ムラなく充填されるようになる。 Next, the case 10 is rotated by a centrifuge so that the bottom side of the case 10 is on the outside and the bent part 2a side of the hollow fiber membrane bundle 2 is on the inside, and centrifugal force is applied. By this centrifugal force, the liquid fixing resin 4 a in the resin pot 11 reaches the bottom side of the case 10 through the discharge pipe 11 a and the center tube 7. That is, the fixing resin 4 a is guided to the center tube 7 and injected into the bottom side of the case 10. Accordingly, the injected fixing resin 4a gradually rises from the bottom side of the case 10 to the bent portion 2a side of the hollow fiber membrane bundle 2, so that the case 10 and the hollow fiber membrane bundle 2 are each in between. The hollow fiber membranes 5 are filled evenly.
　次いで、樹脂ポット１１を取り除き、ケース１０内に充填した固定用樹脂４ａを硬化させることにより、中空糸膜束２の底面部２ｂ側をケース１０の底部に固定する。
　その後、ケース１０の底部側を切断して、中空糸膜束２の底面部２ｂ側を切断する。これにより、中空糸膜束２の前記の底面部２ｂ側、すなわち切断部には各々の中空糸膜５の切断面が形成され、したがって、各々の中空糸膜５の開口端が露出する。また、このように、各々の中空糸膜５の開口端が露出することにより、中空糸膜束２の開口端も底部が開口したケース３（１０）の底部側に露出する。これにより、図１Ａ、及び図１Ｂに示した中空糸膜モジュール１が得られる。 Next, the resin pot 11 is removed, and the fixing resin 4 a filled in the case 10 is cured to fix the bottom surface 2 b side of the hollow fiber membrane bundle 2 to the bottom of the case 10.
Thereafter, the bottom side of the case 10 is cut, and the bottom surface 2b side of the hollow fiber membrane bundle 2 is cut. Thereby, the cut surface of each hollow fiber membrane 5 is formed in the said bottom face part 2b side of the hollow fiber membrane bundle 2, ie, a cutting | disconnection part, Therefore, the opening end of each hollow fiber membrane 5 is exposed. In addition, as described above, the open ends of the hollow fiber membranes 5 are exposed, so that the open ends of the hollow fiber membrane bundles 2 are also exposed on the bottom side of the case 3 (10) whose bottom is open. Thereby, the hollow fiber membrane module 1 shown to FIG. 1A and FIG. 1B is obtained.
　本実施形態の中空糸膜モジュール１の製造方法にあっては、中空糸膜束２を、曲げ方向が一定方向に揃えられることなく、異なる方向を向くように形成するべく、多数本の中空糸膜束２を、芯棒を中心にして該中心側から外側に向けてＵ字状に曲げる。これとともに、中空糸膜束２を、前記芯棒を中心にして放射状に配置して集束し、中空糸膜束２を形成することができる。これにより、中空糸膜束２の平面形状を、ケース３の平面形状に容易に合わせて形成することができる。すなわち、平面視円形状のケース３に対して、中空糸膜束２を平面視円形の略円柱状（略円筒状）に形成することができる。したがって、中空糸膜束２の直径をケース３の内径に合わせることにより、ケース３に隙間無く中空糸膜束２を装填することができ、これによって、ケース３への中空糸膜５の充填効率を高めることができる。よって、中空糸膜モジュール１の濾過性能を向上させることができる。 In the manufacturing method of the hollow fiber membrane module 1 of the present embodiment, a number of hollow fibers are formed so that the hollow fiber membrane bundle 2 is formed so as to face different directions without being aligned in a constant direction. The membrane bundle 2 is bent in a U shape from the center side toward the outside with the core rod as the center. At the same time, the hollow fiber membrane bundle 2 can be formed by radially arranging and concentrating the hollow fiber membrane bundle 2 around the core rod. Thereby, the planar shape of the hollow fiber membrane bundle 2 can be easily formed in accordance with the planar shape of the case 3. That is, the hollow fiber membrane bundle 2 can be formed in a substantially columnar shape (substantially cylindrical shape) circular in plan view with respect to the case 3 having a circular shape in plan view. Therefore, by matching the diameter of the hollow fiber membrane bundle 2 with the inner diameter of the case 3, the hollow fiber membrane bundle 2 can be loaded in the case 3 without any gap, and thereby the efficiency of filling the hollow fiber membrane 5 into the case 3 is improved. Can be increased. Therefore, the filtration performance of the hollow fiber membrane module 1 can be improved.
　また、中空糸膜束２の略中心部に空隙部６を形成するとともに、この空隙部６にセンターチューブ７を設け、このセンターチューブ７を通してケース１０の底部側に液状の固定用樹脂４ａを注入し、中空糸膜束２の底面部２ｂ側をケース１０の底部に固定するようにしたので、ケース１０の底部に固定用樹脂４ａを均一に注入、充填することができる。したがって、ケース１０の底部に対する中空糸膜束２の固定や中空糸膜５間の封止などにムラが生じないことから、固定用樹脂４（４ａ）の層高を比較的薄く（低く）しても、中空糸膜束２の底部を確実に固定、封止することができる。よって、得られる中空糸膜モジュール１の小型化が可能になる。 In addition, a gap 6 is formed at substantially the center of the hollow fiber membrane bundle 2, a center tube 7 is provided in the gap 6, and a liquid fixing resin 4 a is injected into the bottom of the case 10 through the center tube 7. Since the bottom surface 2b side of the hollow fiber membrane bundle 2 is fixed to the bottom of the case 10, the fixing resin 4a can be uniformly injected and filled into the bottom of the case 10. Accordingly, there is no unevenness in fixing the hollow fiber membrane bundle 2 to the bottom of the case 10 and sealing between the hollow fiber membranes 5, so that the layer height of the fixing resin 4 (4a) is made relatively thin (low). However, the bottom part of the hollow fiber membrane bundle 2 can be reliably fixed and sealed. Therefore, the hollow fiber membrane module 1 obtained can be reduced in size.
　また、空隙部６にセンターチューブ７を設ける際に、中空糸膜束２から芯棒を外した後、形成された空隙部６にセンターチューブ７を挿通する工程（ステップ）とすることで、芯棒として所望の空隙部が形成可能な適宜なものを用いることにより、中空糸膜束２の形成工程を簡易化することができる。 Moreover, when providing the center tube 7 in the space | gap part 6, after removing a core rod from the hollow fiber membrane bundle 2, it is set as the process (step) of inserting the center tube 7 in the formed space | gap part 6. By using an appropriate rod that can form a desired void, the process of forming the hollow fiber membrane bundle 2 can be simplified.
　また、このような製造方法によって得られた中空糸膜モジュール１にあっては、中空糸膜束２の平面形状がケース３の平面形状に合わせて形成されることにより、ケース３に対する中空糸膜５の充填効率が高められ、したがって、濾過性能が向上する。
　また、センターチューブ７を通して固定用樹脂４ａが注入されることにより、ケース１０（３）の底部に固定用樹脂４ａ（４）が均一に注入、充填され、したがって固定用樹脂の層高を比較的薄く（低く）することができる。よって、中空糸膜モジュール１の小型化が可能になる。 Further, in the hollow fiber membrane module 1 obtained by such a manufacturing method, the hollow fiber membrane bundle 2 is formed so that the planar shape of the hollow fiber membrane bundle 2 matches the planar shape of the case 3. 5 filling efficiency is increased, thus improving the filtration performance.
Further, by injecting the fixing resin 4a through the center tube 7, the fixing resin 4a (4) is uniformly injected and filled in the bottom portion of the case 10 (3), so that the layer height of the fixing resin is relatively increased. Can be thin (lower). Therefore, the hollow fiber membrane module 1 can be downsized.
　なお、本発明の技術範囲は、前記実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲において種々の変更を加えることが可能である。
　例えば、前記の実施形態では、中空糸膜束２を形成する際、その空隙部６を形成するために芯棒を用いた方法を説明しているが、このような芯棒として、直接、センターチューブ７を用いるようにしてもよい。このように芯棒としてセンターチューブ７を用いることにより、中空糸膜束２を形成する工程（ステップ）によって、空隙部６にセンターチューブ７を設ける工程（ステップ）を兼ねることができ、したがって、工程を簡略化することが可能になる。 The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, when the hollow fiber membrane bundle 2 is formed, a method using a core rod to form the gap portion 6 is described. The tube 7 may be used. By using the center tube 7 as a core rod in this way, the step (step) of forming the hollow fiber membrane bundle 2 can also serve as the step (step) of providing the center tube 7 in the gap 6, and therefore the process Can be simplified.
　また、前記の実施形態では、中空糸膜束２を一つの大きな束として形成したが、これには限定されず、例えば、図６の平面図に示すように、中空糸膜束１２を、センターチューブ７を中心とした周方向にて複数に分割された小束１２ａによって形成してもよい。このような小束１２ａとしては、例えば、図６に示す例のように、これを構成する中空糸膜５がＵ字状に曲げられると共に同じ方向に向いて揃えられていてもよく、あるいは、前記中空糸膜束２と同様に放射状に配置されていてもよい。 In the above embodiment, the hollow fiber membrane bundle 2 is formed as one large bundle. However, the present invention is not limited to this. For example, as shown in the plan view of FIG. You may form with the small bundle 12a divided | segmented into plurality in the circumferential direction centering on the tube 7. FIG. As such a small bundle 12a, for example, as in the example shown in FIG. 6, the hollow fiber membrane 5 constituting this may be bent in a U shape and aligned in the same direction, or Similar to the hollow fiber membrane bundle 2, they may be arranged radially.
　ただし、小束１２ａは、その中空糸膜５が同じ方向（一定方向）に向いて揃えられているとしても、図６に示すように、これら小束１２ａから構成される中空糸膜束１２は、これを構成する中空糸膜５の曲げ方向が一定方向に揃えられることなく異なる方向を向くように形成される。すなわち、中空糸膜束１２は、各小束１２ａの向きが互いに異なるように配置されてケース３内に装填される。 However, even if the small bundles 12a are aligned so that the hollow fiber membranes 5 are oriented in the same direction (constant direction), as shown in FIG. The hollow fiber membrane 5 constituting this is formed so that the bending direction of the hollow fiber membrane 5 faces different directions without being aligned in a certain direction. That is, the hollow fiber membrane bundle 12 is placed in the case 3 so that the directions of the small bundles 12a are different from each other.
　このように、中空糸膜束１２を複数の小束１２ａによって構成することにより、中空糸膜束１２の膜面積を増加することができ、したがって、濾過性能を向上させることができる。また、中空糸膜束１２の略中心部に空隙部を形成するのが容易になり、さらに、中空糸膜束１２の平面視形状を、ケース３の平面視形状に合わせて適宜に形成することが可能になる。よって、ケース３内に隙間無く中空糸膜束１２を装填することができ、これによって、ケース３への中空糸膜５の充填効率を高めることができることから、中空糸膜モジュール１の濾過性能をより向上させることが可能になる。 Thus, by configuring the hollow fiber membrane bundle 12 with a plurality of small bundles 12a, the membrane area of the hollow fiber membrane bundle 12 can be increased, and thus the filtration performance can be improved. In addition, it becomes easy to form a void at the substantially central portion of the hollow fiber membrane bundle 12, and the plan view shape of the hollow fiber membrane bundle 12 is appropriately formed in accordance with the plan view shape of the case 3. Is possible. Therefore, the hollow fiber membrane bundle 12 can be loaded in the case 3 without a gap, and thereby the filling efficiency of the hollow fiber membrane 5 into the case 3 can be increased. Therefore, the filtration performance of the hollow fiber membrane module 1 can be improved. It becomes possible to improve further.
　また、中空糸膜束を装填するケースとしては、図示例のような円筒状に限定されることなく、例えば、長円筒状や楕円筒状、四角筒状など、種々の筒状のものを用いることができる。
　また、前記した中空糸膜モジュール１は、例えば、ケース３内に活性炭を充填することで、浄水器用のカートリッジとすることができる。すなわち、本発明に係る中空糸膜モジュール１は、浄水器用カートリッジの製造に好適に用いられる部材となる（例えば、図７に示すポット型浄水器１００を参照）。 In addition, the case for loading the hollow fiber membrane bundle is not limited to the cylindrical shape as shown in the figure, and for example, various cylindrical shapes such as a long cylindrical shape, an elliptical cylindrical shape, and a rectangular cylindrical shape are used. be able to.
Moreover, the above-mentioned hollow fiber membrane module 1 can be made into the cartridge for water purifiers by filling the case 3 with activated carbon, for example. That is, the hollow fiber membrane module 1 which concerns on this invention becomes a member used suitably for manufacture of the cartridge for water purifiers (for example, refer the pot type water purifier 100 shown in FIG. 7).
　その他、本発明の主旨を逸脱しない範囲で、前記した実施形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した変形例を適宜組み合わせてもよい。 In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.
以下に、本発明の中空糸膜モジュールとその製造方法の実施例について説明するが、本発明は、以下の実施例に制限されるものではない。 Examples of the hollow fiber membrane module and the manufacturing method thereof according to the present invention will be described below, but the present invention is not limited to the following examples.
（中空糸膜モジュールの作製）
本実施例においては、まず、図１Ａ及び図１Ｂ中に示すような中空糸膜束２を形成した後、これを、図７中に示すようなケース３０に挿入することで中空糸膜モジュール１Ａを作製した。 (Production of hollow fiber membrane module)
In this embodiment, first, a hollow fiber membrane bundle 2 as shown in FIGS. 1A and 1B is formed, and then inserted into a case 30 as shown in FIG. Was made.
すなわち、本実施例では、まず、糸長（膜幅）６５ｍｍ（有効糸長：５１ｍｍ；ポッティング長：８ｍｍ、カット長：６ｍｍ）のポリスルフォンからなる多数本の中空糸膜５を、その一端側を芯棒とともに円筒体内に挿入して保持固定した。
次いで、中空糸膜５を、中心部に空隙部６が形成されるように、前記の円筒体の中央部から内壁部に向けてＵ字状に曲げるとともに、中央部から放射状になるよう略円筒状とすることで、図１Ａ及び図１Ｂ中に示すような中空糸膜束２を形成した。 That is, in this example, first, a plurality of hollow fiber membranes 5 made of polysulfone having a yarn length (membrane width) of 65 mm (effective yarn length: 51 mm; potting length: 8 mm, cut length: 6 mm) are arranged on one end side thereof. Was inserted into the cylindrical body together with the core rod and held and fixed.
Next, the hollow fiber membrane 5 is bent in a U-shape from the central portion of the cylindrical body toward the inner wall portion so that a gap portion 6 is formed in the central portion, and is substantially cylindrical so as to be radial from the central portion. As a result, a hollow fiber membrane bundle 2 as shown in FIGS. 1A and 1B was formed.
次いで、円筒状に形成した中空糸膜束２の放射状の中心部に、前記の芯棒を抜くことで形成された空隙部６に、センターチューブ７を挿通した。
次いで、中空糸膜束２の曲げ部２ａと反対の側を加熱切断して底面部を形成した後、センターチューブ７が挿通された状態の中空糸膜束２を、内径が４０ｍｍの円筒状のケース３０に挿入した。このケース３０は、図７中に示すように、胴部３１の円筒軸方向における上部側面に、後述のポット型浄水器を構成する容器１０１に固定するためのＯリング３４が取り付けられている。さらに、ケース３０は、胴部３１の底面部側には、先端が小径の排出口３２ａとされた底蓋３２が備えられているとともに、胴部３１におけるＯリング３４よりも上の位置には、処理対象である原水を取り込むための孔部３３ａが複数で形成された上蓋３３が備えられている点で、図１Ａ及び図１Ｂ等に示すケース３とは異なる。
そして、センターチューブ７のフランジ部７ａから液状の固定用樹脂４ａを注入することにより、中空糸膜束２の底面部を、ケース３０の底面部に、固定用樹脂４ａの硬化によって固定した。
このような工程（ステップ）により、図７（図１Ａ及び図２Ｂに示す中空糸膜モジュール１も参照）中に示すような中空糸膜モジュール１Ａを作製した。
ここで、中空糸膜モジュール１Ａの仕様は、中空糸膜５のケース３０内における充填率を４９．１％、樹脂ポッティング部分を除いた有効膜面積を０．２０７ｍ２とした。 Next, the center tube 7 was inserted into the gap 6 formed by removing the core rod from the radial center of the hollow fiber membrane bundle 2 formed in a cylindrical shape.
Next, the side opposite to the bent portion 2a of the hollow fiber membrane bundle 2 is heated and cut to form a bottom surface portion, and then the hollow fiber membrane bundle 2 with the center tube 7 inserted is formed into a cylindrical shape having an inner diameter of 40 mm. Inserted into case 30. As shown in FIG. 7, an O-ring 34 for fixing the case 30 to a container 101 constituting a pot-type water purifier described later is attached to the upper side surface of the body portion 31 in the cylindrical axis direction. Further, the case 30 is provided with a bottom cover 32 whose tip is a small-diameter discharge port 32 a on the bottom surface side of the body portion 31, and at a position above the O-ring 34 in the body portion 31. The case 3 is different from the case 3 shown in FIG. 1A and FIG. 1B in that an upper lid 33 having a plurality of holes 33a for taking in raw water to be treated is provided.
Then, by injecting liquid fixing resin 4 a from the flange portion 7 a of the center tube 7, the bottom surface portion of the hollow fiber membrane bundle 2 was fixed to the bottom surface portion of the case 30 by curing the fixing resin 4 a.
By such a process, a hollow fiber membrane module 1A as shown in FIG. 7 (see also the hollow fiber membrane module 1 shown in FIGS. 1A and 2B) was produced.
Here, the specifications of the hollow fiber membrane module 1A were such that the filling rate of the hollow fiber membrane 5 in the case 30 was 49.1%, and the effective membrane area excluding the resin potting portion was 0.207 m 2 .
（浄水器用カートリッジの作製）
次に、前記の工程（ステップ）で得られた中空糸膜モジュール１Ａに、２０～４０メッシュの粒状活性炭１１０を２５ｇ充填することにより、浄水器用カートリッジＡを作製し、これを実施例のサンプルとした（図７を参照）。 (Production of cartridge for water purifier)
Next, the hollow fiber membrane module 1A obtained in the above-described step (step) is filled with 25 g of 20-40 mesh granular activated carbon 110 to produce a water purifier cartridge A, which is used as the sample of the example. (See FIG. 7).
これに対し、比較例のサンプルとして、中空糸膜モジュールにおいて、中空糸膜束２の空隙部６にセンターチューブ（芯棒）を挿入していない点を除いて、前記の実施例の浄水器用カートリッジＡと同様の仕様とされた浄水器用カートリッジＢを作製した。ここで、実施例である前記の浄水器用カートリッジＡについては、センターチューブ７から液状の固定用樹脂４ａを注入する工程を含む方法で作製したのに対し、浄水器用カートリッジＢを作製するにあたっては、ケース３の底部近傍の側面に小孔を開け、この小孔から固定用樹脂４ａを内部に注入する方法を採用した。 On the other hand, as a sample of the comparative example, in the hollow fiber membrane module, the cartridge for the water purifier of the above example, except that the center tube (core bar) is not inserted into the gap 6 of the hollow fiber membrane bundle 2 A water purifier cartridge B having the same specifications as A was prepared. Here, the water purifier cartridge A, which is an example, was produced by a method including a step of injecting the liquid fixing resin 4a from the center tube 7, whereas the water purifier cartridge B was produced. A method of opening a small hole in the side surface near the bottom of the case 3 and injecting the fixing resin 4a into the inside from the small hole was adopted.
（実施例と比較例との比較評価）
前記の各工程（ステップ）によって得られた実施例の浄水器用カートリッジＡ、及び、比較例の浄水器用カートリッジＢを、それぞれ、図７中に示すような容器１０１に取り付けることにより、評価用のポット型浄水器１００を作製した。図７に示すように、前記の容器１０１は、浄水処理を行う前の原水（図示せず）を貯留する、容量が１Ｌとされた原水貯留部１０２と、浄水後の処理水を貯留する浄水貯留部１０３とを備えている。そして、浄水器用カートリッジＡ、又は、浄水器用カートリッジＢの上部に設けられたＯリング３４をシール部材として用い、原水貯留部１０２の底部に取り付けることで、原水貯留部１０２に貯留された原水が各浄水器用カートリッジＡ，Ｂに流入し、処理水が浄水貯留部１０３に流入するように構成した。 (Comparative evaluation between examples and comparative examples)
By attaching the water purifier cartridge A of the example obtained by the respective steps (steps) and the water purifier cartridge B of the comparative example to the container 101 as shown in FIG. The mold water purifier 100 was produced. As shown in FIG. 7, the said container 101 stores the raw water (not shown) before performing a water purification process, the raw water storage part 102 made into the capacity | capacitance 1L, and the purified water which stores the treated water after a water purification And a storage unit 103. And the O-ring 34 provided in the upper part of the cartridge A for water purifiers or the cartridge B for water purifiers is used as a sealing member, and by attaching to the bottom part of the raw water storage part 102, the raw water stored in the raw water storage part 102 is each It flowed into the cartridges A and B for water purifiers, and the treated water was configured to flow into the purified water storage unit 103.
以下に、実施例の中空糸膜モジュールＡの詳細な仕様を示す。なお、前述の通り、比較例の浄水器用カートリッジＢは、センターチューブを備えていない点を除き、以下の中空糸膜モジュールＡの仕様と同等である。
（１）中空糸膜長（膜幅）：６５ｍｍ
（２）カット長（中空糸膜）：６ｍｍ
（３）ポッティング長（中空糸膜）：８ｍｍ
（４）有効長（中空糸膜）：５１ｍｍ
（５）カートリッジ内径（ケース内径）：４０ｍｍ
（６）センターチューブ（芯棒）外径：５ｍｍ
（７）有効膜面積：０．２０７ｍ２
（８）ケース内における中空糸膜束の充填率：４９．１％
（９）親水糸内径：４００μｍ
（１０）親水糸膜厚：１００μｍ
（１１）親水糸本数：２１５０本 Below, the detailed specification of the hollow fiber membrane module A of an Example is shown. In addition, as above-mentioned, the cartridge B for water purifiers of a comparative example is equivalent to the following specifications of the hollow fiber membrane module A except that the center tube is not provided.
(1) Hollow fiber membrane length (membrane width): 65 mm
(2) Cut length (hollow fiber membrane): 6mm
(3) Potting length (hollow fiber membrane): 8mm
(4) Effective length (hollow fiber membrane): 51 mm
(5) Cartridge inner diameter (case inner diameter): 40 mm
(6) Center tube (core) outer diameter: 5mm
(7) Effective membrane area: 0.207 m 2
(8) Filling ratio of hollow fiber membrane bundle in the case: 49.1%
(9) Hydrophilic yarn inner diameter: 400 μm
(10) Hydrophilic yarn film thickness: 100 μm
(11) Number of hydrophilic yarns: 2150
評価にあたっては、まず、原水貯留部１０２に１Ｌの原水を入れ、この原水が自重によって各浄水器用カートリッジＡ，Ｂに流入した後に浄水貯留部１０３に流出して、原水貯留部１０２内の原水が全て無くなるまでの時間を測定することで、ろ過速度（初期ろ過流量）を測定した。この際、ろ過速度の測定は、ＪＩＳ Ｓ ３２０１（日本工業規格：２０１０年版）に準拠した方法及び条件によって行った。 In the evaluation, first, 1 L of raw water is put into the raw water storage unit 102, and this raw water flows into each of the water purifier cartridges A and B by its own weight and then flows out into the purified water storage unit 103, so that the raw water in the raw water storage unit 102 is The filtration rate (initial filtration flow rate) was measured by measuring the time until it was completely eliminated. At this time, the filtration rate was measured by a method and conditions based on JIS S3201 (Japanese Industrial Standards: 2010 edition).
上記方法及び条件による評価試験の結果、実施例の浄水器用カートリッジＡは、ろ過速度が０．２６Ｌ／ｍｉｎであったのに対し、比較例の浄水器用カートリッジＢは、ろ過速度が０．１８Ｌ／ｍｉｎであった。
すなわち、実施例の浄水器用カートリッジＡは、１Ｌの原水をろ過するのに４分弱程度の時間を要したのに対し、比較例の浄水器用カートリッジＢでは、１Ｌの原水をろ過するのに５分３０秒以上の時間を要している。このことから、本発明に係る構成の中空糸膜モジュール１Ａを備えることにより、原水のろ過速度を大幅に向上させることが可能であることが明らかである。本発明に係る中空糸膜モジュールによって前述の効果が得られる理由としては、原水が、その自重によって原水貯留部１０２から浄水器用カートリッジＡ（中空糸膜モジュール）に流入したとき、中空糸膜束２の空隙部６に挿通された芯棒（センターチューブ７）により、この空隙部６が拡張され、原水が流入し易くなる作用が得られるということが考えられる。 As a result of the evaluation test according to the above method and conditions, the water purifier cartridge A of the example had a filtration rate of 0.26 L / min, while the water purifier cartridge B of the comparative example had a filtration rate of 0.18 L / min. min.
That is, the water purifier cartridge A of the example required about 4 minutes to filter 1 L of raw water, whereas the water purifier cartridge B of the comparative example 5 required 5 to filter 1 L of raw water. It takes more than 30 minutes. From this, it is clear that the filtration rate of raw water can be significantly improved by providing the hollow fiber membrane module 1A having the configuration according to the present invention. The reason why the above-described effect can be obtained by the hollow fiber membrane module according to the present invention is that when raw water flows into the water purifier cartridge A (hollow fiber membrane module) from the raw water reservoir 102 by its own weight, the hollow fiber membrane bundle 2 It is conceivable that the core 6 (center tube 7) inserted into the gap 6 is expanded and the action of facilitating the flow of raw water is obtained.
１，１Ａ…中空糸膜モジュール、２…中空糸膜束、２ａ…曲げ部、３…ケース、４…固定用樹脂、４ａ…液状の固定用樹脂、５…中空糸膜、６…空隙部、７…センターチューブ（チューブ）、１０…ケース、１２…中空糸膜束、１２ａ…小束、３０…ケース DESCRIPTION OF SYMBOLS 1,1A ... Hollow fiber membrane module, 2 ... Hollow fiber membrane bundle, 2a ... Bending part, 3 ... Case, 4 ... Fixing resin, 4a ... Liquid fixing resin, 5 ... Hollow fiber membrane, 6 ... Cavity part, 7 ... Center tube (tube), 10 ... Case, 12 ... Hollow fiber membrane bundle, 12a ... Small bundle, 30 ... Case

Claims (12)

  1. 多数本の中空糸膜をＵ字状に曲げた中空糸膜束を筒状のケース内に装填し、該ケース内に固定用樹脂を注入して前記中空糸膜束の曲げ部と反対の側を前記ケースの底部に固定した中空糸膜モジュールであって、
    前記中空糸膜は、前記ケース内でＵ字状に曲げられ、
    前記中空糸膜束の略中心部には前記ケースの高さ方向に沿って空隙部が形成され、前記空隙部には芯棒が挿通されている中空糸膜モジュール。     A hollow fiber membrane bundle obtained by bending a large number of hollow fiber membranes into a U-shape is loaded into a cylindrical case, and a fixing resin is injected into the case so that the side opposite to the bent portion of the hollow fiber membrane bundle. A hollow fiber membrane module fixed to the bottom of the case,
    The hollow fiber membrane is bent into a U shape in the case,
    A hollow fiber membrane module in which a hollow portion is formed in a substantially central portion of the hollow fiber membrane bundle along a height direction of the case, and a core rod is inserted into the void portion.
  2. 前記中空糸膜は、前記ケースの中央部から内壁部に向けてＵ字状に曲げられている請求項１記載の中空糸膜モジュール。 The hollow fiber membrane module according to claim 1, wherein the hollow fiber membrane is bent in a U-shape from a central portion of the case toward an inner wall portion.
  3. 　前記中空糸膜は、前記ケースの中央部から放射状に配置されている請求項１又は２に記載の中空糸膜モジュール。 The hollow fiber membrane module according to claim 1 or 2, wherein the hollow fiber membranes are arranged radially from a central portion of the case.
  4. 前記芯棒は、前記固定用樹脂注入用のチューブである請求項１～３のいずれか一項に記載の中空糸膜モジュール。 The hollow fiber membrane module according to any one of claims 1 to 3, wherein the core rod is a tube for injecting the fixing resin.
  5. 　前記ケースが円筒状である請求項１～３のいずれか一項に記載の中空糸膜モジュール。 The hollow fiber membrane module according to any one of claims 1 to 3, wherein the case is cylindrical.
  6. 　前記中空糸膜束は、前記チューブを中心とした周方向にて複数に分割された小束によって形成されている請求項１記載の中空糸膜モジュール。 The hollow fiber membrane module according to claim 1, wherein the hollow fiber membrane bundle is formed by small bundles divided into a plurality in a circumferential direction around the tube.
  7. 　多数本の中空糸膜をＵ字状に曲げた中空糸膜束を筒状のケース内に装填し、該ケース内に固定用樹脂を注入して前記中空糸膜束の曲げ部と反対の側を前記ケースの底部に固定する中空糸膜モジュールの製造方法であって、
    　多数本の中空糸膜を、略中心部に空隙部が形成されるようにしてＵ字状に曲げて中空糸膜束を形成するステップと、
    　前記空隙部にチューブを設けるステップと、
    　前記中空糸膜束の曲げ部と反対の側を加熱切断して底面部を形成するステップと、
    　前記底面部を形成した中空糸膜束を筒状のケース内に装填するステップと、
    　前記チューブを通して前記ケースの底部側に固定用樹脂を注入し、前記中空糸膜束の底面部側を前記ケースの底部に固定するステップと、
    　前記ケースの底部側を切断して前記中空糸膜束の底面部側を切断し、該中空糸膜束の開口端を露出させるステップと、
    　を有する中空糸膜モジュールの製造方法。     A hollow fiber membrane bundle obtained by bending a large number of hollow fiber membranes into a U-shape is loaded into a cylindrical case, and a fixing resin is injected into the case so that the side opposite to the bent portion of the hollow fiber membrane bundle. Is a method for manufacturing a hollow fiber membrane module for fixing to the bottom of the case,
    Bending a large number of hollow fiber membranes into a U-shape so that a void portion is formed at a substantially central portion to form a hollow fiber membrane bundle;
    Providing a tube in the gap;
    Heating and cutting the opposite side of the bent portion of the hollow fiber membrane bundle to form a bottom portion;
    Loading the hollow fiber membrane bundle having the bottom portion into a cylindrical case;
    Injecting a fixing resin to the bottom side of the case through the tube, and fixing the bottom surface side of the hollow fiber membrane bundle to the bottom of the case;
    Cutting the bottom side of the case to cut the bottom side of the hollow fiber membrane bundle, exposing the open end of the hollow fiber membrane bundle;
    The manufacturing method of the hollow fiber membrane module which has this.
  8. 　前記中空糸膜束を形成するステップでは、多数本の中空糸膜を、芯棒を中心にして該中心側から外側に向けてＵ字状に曲げるとともに、前記中空糸膜を、前記芯棒を中心にして放射状に配置して集束し、中空糸膜束を形成する請求項７記載の中空糸膜モジュールの製造方法。 In the step of forming the hollow fiber membrane bundle, a number of hollow fiber membranes are bent in a U shape from the center side toward the outside with the core rod as the center, and the hollow fiber membrane is The method for producing a hollow fiber membrane module according to claim 7, wherein the hollow fiber membrane bundle is formed by radially arranging and converging at the center.
  9. 　前記芯棒として、前記チューブを用いる請求項８記載の中空糸膜モジュールの製造方法。 The method for producing a hollow fiber membrane module according to claim 8, wherein the tube is used as the core rod.
  10. 　前記空隙部にチューブを設けるステップでは、前記中空糸膜束から前記芯棒を外した後、形成された空隙部に前記チューブを挿通する請求項８記載の中空糸膜モジュールの製造方法。 The method for producing a hollow fiber membrane module according to claim 8, wherein, in the step of providing a tube in the void portion, the tube is inserted into the formed void portion after removing the core rod from the hollow fiber membrane bundle.
  11. 　前記ケースが円筒状である請求項８～１０のいずれか一項に記載の中空糸膜モジュールの製造方法。 The method for producing a hollow fiber membrane module according to any one of claims 8 to 10, wherein the case is cylindrical.
  12. 　前記中空糸膜束を形成するステップでは、前記中空糸膜束を、前記空隙部を中心とした周方向にて複数に分割された小束によって形成する請求項７記載の中空糸膜モジュールの製造方法。 The hollow fiber membrane module manufacturing method according to claim 7, wherein in the step of forming the hollow fiber membrane bundle, the hollow fiber membrane bundle is formed by a small bundle divided into a plurality in a circumferential direction centering on the gap portion. Method.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018230631A1 (en) * 2017-06-14 2018-12-20 三菱ケミカル・クリンスイ株式会社 External circulation-type hollow fiber membrane module
JPWO2018230631A1 (en) * 2017-06-14 2019-06-27 三菱ケミカル・クリンスイ株式会社 External perfusion type hollow fiber membrane module
KR20200010431A (en) * 2017-06-14 2020-01-30 미츠비시 케미카루 크린스이 가부시키가이샤 External Perfusion Hollow Fiber Membrane Module
KR102323004B1 (en) * 2017-06-14 2021-11-05 미츠비시 케미카루 크린스이 가부시키가이샤 External perfusion hollow fiber membrane module
US11701620B2 (en) 2017-06-14 2023-07-18 Mitsubishi Chemical Cleansui Corporation External circulation-type hollow fiber membrane module

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TWI554327B (en) 2016-10-21
KR20160130311A (en) 2016-11-10
JPWO2015137308A1 (en) 2017-04-06
TW201544167A (en) 2015-12-01
JP6079871B2 (en) 2017-02-15

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