JP2010184219A - Method for producing hollow fiber membrane module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a hollow fiber membrane module which is capable of easily opening the ends of hollow fiber membranes even in the case of a large-size hollow fiber membrane module. <P>SOLUTION: This invention provides the method for producing the hollow fiber membrane module composed of hollow fiber membranes fixed at a water collection pipe with a resin, which method comprises the step of placing a groove-forming jig made from a foamed resin and provided with a recess into which the front end of a hollow fiber membrane is inserted within the water collection pipe, the step of placing the front end of the hollow yarn membrane in the recess through the opening, the step of filling a foamable resin in the recess and curing the resin, the step of filling a nonfoamable potting resin on the top of the foamable resin and within the recess and curing the resin, the step of cutting the hollow fiber membrane at a part of the foamable resin, and the step of removing the remaining groove-forming jig. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a hollow fiber membrane module. More specifically, the present invention relates to a method for manufacturing a hollow fiber membrane module that can be used to filter suspended substances contained in highly polluted water such as river water, human waste, sewage, and wastewater.

  Porous membranes such as microfiltration membranes and ultrafiltration membranes are used in a wide range of fields for the purpose of treating contaminants such as industrial wastewater and sterilizing pharmaceutical water.

  The hollow fiber membrane module used in these fields includes, for example, a cylindrical type in which hollow fiber membranes are concentrically arranged in a circular shape or a concentric shape that has been used in the field of conventional microfiltration. In recent years, a hollow fiber membrane module in which the shape of the opening of the hollow fiber membrane is almost rectangular has been used for high integration in the membrane treatment tank.

  When suction filtration is performed with a hollow fiber membrane module in which the shape of the opening of the hollow fiber membrane is substantially rectangular, the hollow fiber membrane floats in the filtration target water in a sparse state, and intermittently or Filtration can be performed while continuously cleaning the membrane surface. In the conventional cylindrical type microfiltration module, an organic substance or the like is deposited on the surface of the hollow fiber membrane, and the hollow fiber membranes are fixedly integrated with each other, the effective membrane area is reduced, and the filtration flow rate may be drastically lowered. On the other hand, the hollow fiber membrane module in which the shape of the opening of the hollow fiber membrane is substantially rectangular does not have such drawbacks, and the membrane function recovery process is very easy.

  As the potting resin used in the structure of such a hollow fiber membrane module, there are three main types of epoxy, polyurethane and acrylic. These potting resins are focused on forming a structure, and a very strong adhesive force can be obtained. For example, when the potting resin is bonded to another constituent member and a force is applied, the adhesive force is often so strong that the material itself is broken before the bonded surface is broken.

  Here, FIG. 9 shows a cross-sectional view of a water collecting pipe portion in a hollow fiber membrane module in which the opening of the hollow fiber membrane end face is substantially rectangular, and a conventional manufacturing example of the hollow fiber membrane module will be described. In the method shown in FIG. 9, first, the hollow fiber membrane (hollow fiber membrane knitted fabric) 1 is once resin-fixed using a rectangular formwork jig 11, and a part of the solidified resin is cut (dotted line portion). ) To form an open end in the hollow fiber membrane (FIG. 9A). Thereafter, the opening end of the hollow fiber membrane fixed with resin is inserted into a substantially rectangular opening provided on the side surface of the water collecting pipe 2, and then the water collecting pipe 2 is turned upside down to open the opening portion of the hollow fiber membrane end face. Potting resin (not shown) is filled and fixed in the gap between the resin and the opening of the water collecting pipe 2 so as not to be blocked (FIG. 9B).

  In these hollow fiber membrane module production examples, the hollow fiber membrane end is potted once in a rectangular shape, and a part of it is cut to provide an opening in the hollow fiber membrane, which is then inserted into the rectangular opening on the side of the water collection tube. The method of fixing is taken. For this reason, it may leak from the joint surface of the water collection pipe 2 and potting resin.

  Here, in the hollow fiber membrane module, it is necessary to open the end of the potted hollow fiber membrane. Therefore, in the manufacturing method of the hollow fiber membrane module, easy opening is considered as well as high adhesive force. Therefore, various methods have been disclosed for the purpose of establishing a method for producing a hollow fiber membrane module having adhesive strength and easy opening as a structure at the same time.

  For example, in Patent Document 1, a hollow core made of a soft resin provided with a concave portion is arranged in a water collecting pipe, an end of a hollow fiber membrane is placed in the concave portion, and solidified by potting resin, and then the whole hollow core A method of opening the end by a cutter is disclosed.

  Patent Document 2 discloses a method in which a water-soluble gel is filled and solidified, then fixed with a potting resin for fixing a hollow fiber membrane, and the end surface is opened by washing the water-soluble gel with water after solidification.

Japanese Patent No. 3330231

Special table 2003-532521 gazette

  However, the method described in Patent Document 1 has a problem that a large force is required for a blade inserted into a long rectangle, particularly in a large module, and a large load is applied to the cutting machine and the blade. In addition, if the resin is heat-treated for easy cutting, the flexibility of the resin increases and the resin is bent at the time of cutting, so that the cut surface becomes rough.

  In the method described in Patent Document 2, it is necessary to wash a water-soluble gel, and it may take time to sufficiently dissolve and wash, and the residue (undissolved material) clogs a pump or the like. There was a problem.

  An object of this invention is to provide the manufacturing method of the hollow fiber membrane module which can open a hollow fiber membrane easily even if it corresponds to the enlargement of a hollow fiber membrane module.

Therefore, the present invention provides
[1] A method for manufacturing a hollow fiber membrane module in which a hollow fiber membrane is fixed to a water collecting pipe through an opening with a resin, the groove forming treatment made of foamed resin provided with a recess so that the tip of the hollow fiber membrane enters. A step of installing a tool in the water collecting pipe, a step of disposing a tip of the hollow fiber membrane in the recess through the opening, a step of filling and curing the foamable resin in the recess, and the recess Filling and curing the non-foaming potting resin on the top of the foamable resin; cutting the hollow fiber membrane at the foamable resin portion; removing the remaining groove forming jig; A process for producing a hollow fiber membrane module comprising:
[2] The method for producing a hollow fiber membrane module according to [1], wherein the groove forming jig is a foamed fluororesin container.
[3] The foamable resin has a ratio (Vb / V) of the volume after foaming / curing (Vb) and the volume before curing (Vb) of 1.1 to 10 [1] or [2 ] The manufacturing method of the hollow fiber membrane module of description.
[4] The method for producing a hollow fiber membrane module according to any one of [1] to [3], wherein the groove property of the groove forming jig is a closed cell type.
[5] The method for producing a hollow fiber membrane module according to any one of [1] to [4], wherein the foamable resin is a urethane resin or an epoxy resin containing a foaming agent.
[6] The method for manufacturing a hollow fiber membrane module according to any one of [1] to [5], wherein the non-foaming potting resin is a urethane resin or an epoxy resin.
[7] The method for producing a hollow fiber membrane module according to any one of [1] to [6], wherein the hollow fiber membrane is a knitted fabric.
[8] The cutting according to any one of [1] to [7], wherein a cutting blade is inserted from a side surface of the water collecting pipe to cut the hollow fiber membrane together with the foamable resin. Manufacturing method of hollow fiber membrane module.

  According to the present invention, a hollow fiber membrane module in which the end surface of the hollow fiber membrane is opened can be easily manufactured.

It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention ((a) short direction sectional drawing, (b) longitudinal direction sectional drawing). It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention ((a) short direction sectional drawing, (b) longitudinal direction sectional drawing). It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention ((a) short direction sectional drawing, (b) longitudinal direction sectional drawing). It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention ((a) short direction sectional drawing, (b) longitudinal direction sectional drawing). It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention ((a) short direction sectional drawing, (b) longitudinal direction sectional drawing). BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention, Comprising: It is the schematic which shows the state which removed the foamable resin as needed ((a) Short direction cross section (B) Longitudinal sectional view). BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention, Comprising: It is the schematic which shows an example of a preferable form ((a) Short direction sectional drawing, (b) Longitudinal direction Sectional view). BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating one process in the manufacturing method of the hollow fiber membrane module which concerns on this invention, Comprising: It is the schematic which shows an example of a preferable groove part formation jig | tool ((a) Short direction sectional drawing, (b) ) Longitudinal sectional view). It is a schematic process drawing which shows the manufacturing method of the conventional hollow fiber membrane module.

  Hereinafter, the present invention will be described with reference to FIGS. FIGS. 1-8 is a schematic process drawing for demonstrating the manufacturing method of the hollow fiber membrane module which concerns on this invention, and represents sectional drawing (a) of a transversal direction, and sectional drawing (b) of a longitudinal direction.

  First, a foamed resin groove forming jig 3 provided with a recess so that the tip of the hollow fiber membrane 1 enters is installed in the water collecting pipe 2. And the front-end | tip of the hollow fiber membrane 1 is arrange | positioned in the recessed part of the groove part formation jig | tool 3 through an opening part (FIG. 1). In addition, leakage prevention can be performed so that the resin does not leak from both ends of the water collecting pipe 2.

  Next, the foamable resin 4 is filled in the recess of the groove forming jig 3 and cured (FIG. 2). In FIG. 2, 4 'represents the foamable resin 4 and the hollow fiber membrane.

  Next, the non-foaming potting resin 5 having adhesiveness with the foamable resin is filled in the upper part of the foamable resin 4 and cured (FIG. 3). In FIG. 3, the hollow fiber membrane 1 is a concave portion of a groove forming jig 3 made of foamed resin, and is bonded and fixed to the water collecting pipe 2 with the foamable resin 4 on the lower side and the non-foamable potting resin 5 on the upper side. ing. In FIG. 3, 5 'represents the non-foaming potting resin 5 and the hollow fiber membrane.

  Next, the hollow fiber membrane 1 is cut at the portion of the foamable resin 4 (FIG. 4).

  And the remaining groove part formation jig | tool 3 is removed, the cap 6 is attached, and a hollow fiber membrane module is produced (FIG. 5). The remaining foamable resin 4 can be removed as needed (FIG. 6), but it is not necessary to remove it if there is no problem in performance as a hollow fiber membrane module. Moreover, the cutting process of the foamable resin 4 can be omitted or simplified by cutting near the boundary between the foamable resin 4 and the non-foamable potting resin 5 (FIG. 8).

  Hereinafter, each component will be described.

(Groove part forming jig made of foamed resin)
In the present invention, the groove forming jig installed in the water collecting pipe is made of foamed resin. By using a foamed resin groove forming jig, the cutting process can be easily performed. The foamed resin material is not particularly limited as long as it is a foamable resin. Moreover, by producing the groove forming jig with a foamed resin, it is easy to insert the groove forming jig into the water collecting pipe due to its elasticity, and resin leakage from the gap can be suppressed.

  As the foamed resin material, for example, a resin to which a foaming agent is added can be used.

Examples of the foamed resin material include foamed polystyrene resin. More specifically, PIOCELAN ELV (“trade name”, polystyrene / polyolefin composite resin foam: manufactured by Sekisui Plastics Kogyo Co., Ltd.), polyolefin-based foam Torepef (“trade name”, manufactured by Toray Industries, Inc.), and the like. Further, the shape of the bubble is preferably a closed cell from the viewpoint of dimensional stability and prevention of penetration of the potting resin.

  Moreover, the shape of the groove forming jig has a concave portion in a portion where the tip of the hollow fiber membrane is arranged. That is, the groove forming jig has a recess in a part, and when the groove is formed so that the opening of the water collecting pipe and the recess are aligned, for example, the groove is formed by the groove forming jig and the water collecting pipe. It has a shape that can be Moreover, it is preferable to design so that a recessed part is arrange | positioned in the opening part of a water collection pipe when installing in a water collection pipe, and to select a shape suitably according to the internal shape of a water collection pipe. It may have a rod shape such as a cylinder or a prism, or it may be hollow while maintaining the recess (FIG. 8). In addition, when inserted into the water collection pipe, the internal shape of the water collection pipe is supported at an appropriate part on the side of the groove forming jig so that it can be installed and fixed with an appropriate distance from the inner wall of the water collection pipe. Protruding protrusions may be installed.

(Foaming resin)
The foamable resin is a thermosetting resin having foamability, and examples thereof include liquid resins such as an epoxy resin, an unsaturated polyester resin, and a polyurethane resin containing a foaming agent.

  The foamable resin is not particularly limited as long as it is a foamable thermosetting resin. A thing in which a foaming agent is mixed with a thermosetting resin may be used. For example, in a polyurethane resin, a flexible urethane foam, a rigid urethane foam, etc. are mentioned. Among them, a two-component mixed type composed of a combination of a main agent and a curing agent is particularly preferable in terms of handling.

  In many cases, the one-liquid type has poor fluidity because of foaming by gas filling, and many things are instantly foamed and solidified, which is not preferable for filling between films because of its handleability.

  Examples of the foaming agent used in the two-component mixed type include a pyrolytic foaming agent, a volatile foaming agent, and a hollow particle foaming agent. These foaming agents may use only 1 type and may use 2 or more types.

  As the pyrolytic foaming agent, for example, an inorganic pyrolytic foaming agent such as sodium bicarbonate, ammonium carbonate, or ammonium bicarbonate can be used. In addition, an organic pyrolytic foaming agent such as azodicarbonamide, azobisisobutyronitrile, or dinitrosopentamethylenetetramine can be used. Further, as the volatile foaming agent, aliphatic hydrocarbons such as propane or butane, halogenated hydrocarbons such as chlorodifluoromethane or difluoromethane, carbon dioxide or nitrogen can be used.

  Although the compounding quantity of a foaming agent is not specifically limited, When resin is 100 mass parts, it can be set as 1-50 mass parts, for example, It is more preferable to set it as 1-30 mass parts, 2-25 mass parts It is particularly preferable that When the pyrolytic foaming agent is blended, it is not necessary to raise the temperature to a particularly high temperature as in the case where water is used as the foaming agent, and heating may be performed at a temperature at which the pyrolytic foaming agent decomposes.

  In the foamable resin, the ratio (Vb / V) of the volume (V) before curing and the volume (Vb) at the time of foaming is preferably 1.1 to 10, and preferably 1.1 to 8. Is more preferable, and 1.1 to 5 is particularly preferable. If (Vb / V) is in such a range, it has a sufficient porosity that can be easily cut, and can have appropriate strength and fluidity. When (Vb / V) is smaller than 1.1, the porosity is low, and thus it is not preferable because cutting becomes difficult because heating is required. Moreover, when (Vb / V) is larger than 10, foaming is difficult to control, and the impregnation property of the resin near the open end of the hollow fiber membrane is lowered, which is not preferable.

  Further, as a material other than the foaming agent, additives such as a foaming aid, an antioxidant, an antistatic agent, a lubricant, a plasticizer, or a pigment can be appropriately blended as necessary.

(Non-foaming potting resin)
The non-foaming potting resin is a potting resin that does not have foaming properties, and a commonly used potting resin can be used. For example, an epoxy resin, an unsaturated polyester resin, a polyurethane resin, or the like can be used. Furthermore, additives such as an antioxidant, an antistatic agent, a lubricant, a plasticizer, or a pigment can be blended with the potting resin as necessary.

(Method of filling the potting resin into the module)
In the production of a hollow fiber membrane module, a method of utilizing centrifugal force is generally employed as a method for filling a liquid potting resin without a gap between the hollow fiber membranes. However, when a hollow fiber membrane knitted fabric is used, the density of the hollow fiber membrane of the resin fixing part is regulated by the knitted fabric structure, and there is no bias, so a method using vibration or a method using only gravity is also possible. . Details of the resin fixing method (potting method) of the hollow fiber membrane by the vibration method are disclosed in, for example, Japanese Patent Application Laid-Open No. 3-114515. Here, the viscosity of the resin is preferably about 1000 to 2500 centipoise.

(Opening method of hollow fiber membrane end)
The hollow fiber membrane can be cut together with the groove forming jig and the foamable resin from the hole provided on the side surface of the water collecting pipe 2 using a cutting means. As the cutting means, for example, a cutter blade can be used. By removing the remaining groove forming jig, a hollow fiber membrane module can be obtained. The cutting position has a thickness sufficient for the bottom plate part (or top plate part) that remains as a part of the module case 5 to adhere to the hollow fiber membrane and is updated by cutting. It is preferable that the end of the separated separation membrane bundle 3 is a portion that is open to the cut surface.

  The cutter blade is not particularly limited as long as it can be inserted in the longitudinal direction inside the foaming resin. In the present invention, the end portion of the hollow fiber membrane bonded and fixed with the foamable resin and the groove forming jig around it are cut.

  Examples of the cutter blade include a cutter blade that is attached to a cylindrical cutter handle, and the cut piece on the end surface of the hollow fiber membrane is discharged through the inside of the cutter handle cylinder.

  Moreover, the hollow fiber membrane module without a leak can be obtained by joining the cap 6 to the both ends of the water collection pipe | tube 2 after a cutting process.

  Here, the cap is preferably made of the same material as the water collecting pipe. For example, when the resins are the same material, they can be easily joined by solvent bonding, as is generally done for resin piping. In addition, the water collecting pipe and the cap form a male screw and a female screw, respectively, and joining by screwing is also possible. It is desirable that the cap has a structure in which piping can be joined for suction filtration.

(Hollow fiber membrane)
In the present invention, the hollow fiber membrane is not particularly limited, and a known hollow fiber membrane can be used. The fractionation level of the hollow fiber membrane may be any level such as a microfiltration membrane (MF), an ultrafiltration membrane (UF), or a nanofiltration membrane (NF). Moreover, as long as it can be used as a filtration membrane, the pore diameter, porosity, film thickness, outer diameter and the like are not particularly limited, but are appropriately selected depending on what is to be filtered. Furthermore, in order to remove organic substances and viruses, an ultrafiltration membrane having a molecular weight cut off of tens of thousands to hundreds of thousands may be used.

  Examples of the hollow fiber membrane of the present invention include cellulose-based, polyolefin-based, polyvinyl alcohol-based, polysulfone-based, polyacrylonitrile-based, and fluorine-based resins. Any material that can be molded into the shape of the separation membrane can be used. Examples of the material include polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, and polysulfone.

  In particular, as the surface characteristics of the hollow fiber membrane, it is preferable to use a resin having strong chemical resistance, and a fluorine resin is particularly preferable. Among the fluororesins, it is more preferable to use vinylidene fluoride resin from the viewpoint of formability to the film and chemical resistance. Here, examples of the vinylidene fluoride resin include a homopolymer of vinylidene fluoride, and a copolymer of vinylidene fluoride and a monomer copolymerizable with vinylidene fluoride. Examples of the copolymerizable monomer include vinyl fluoride, tetrafluoroethylene, ethylene trifluoride, and hexafluoropropylene.

  The hollow fiber membrane has a plurality of pores. The pores are preferably continuous pores that penetrate the front and back surfaces of the hollow fiber membrane. The pore diameter can be arbitrarily selected depending on the purpose, but for example, it is suitably 0.01 to 5 μm, preferably 0.1 to 1 μm.

  The hollow fiber membrane of the present invention preferably has an asymmetric structure in which the pore diameter on one surface is small and the pore diameter on the other surface is large. In the case of an asymmetric structure, it is appropriate that the pore diameter on one surface is greater than 1 and 100 or less, preferably 2 to 10 times the other surface pore diameter.

The outer diameter of the hollow fiber membrane can be, for example, 0.1 to 10 mm, preferably 0.5 to 5 mm. The hollow fiber membrane of the present invention has a pure water permeability coefficient indicating liquid permeability to pure water of 10 to 250 m ³ / m ² / hour / MPa, preferably 20 to 150 m ³ / m ² / hr / MPa. Is appropriate. In addition, a pure water permeability coefficient can be calculated | required from the following formula | equation.

Pure water permeability coefficient = [pure water permeation amount (m ³ )] / [surface area of porous membrane (m ² )] / [permeation time (hours)] / [pure water pressure (MPa)]

(Hollow fiber membrane module and its structure)
The hollow fiber membrane module has a shape in which a hollow fiber membrane is potted in a water collecting pipe. As for the shape, the water collecting pipes may be provided at both ends of the hollow fiber membrane (straight end type), or the water collecting pipe may be provided at one end of the hollow fiber membrane (linear one side opening) Type).

  Furthermore, the shape of the water collecting pipe is not particularly limited, and examples thereof include a rectangular shape, an annular shape, and a cylindrical shape. What is necessary is just to select a suitable shape in the range which does not reduce the washing | cleaning property by an aeration method.

  The water collecting tube functions as a member that supports the entire hollow fiber membrane module and collects fluid that is suction filtered inside the hollow fiber membrane. The side surface has an elongated, substantially rectangular opening. The material only needs to have mechanical strength and durability, and examples thereof include polycarbonate, polysulfone, polypropylene, acrylic resin, ABS resin, modified PPE resin, PPS resin, and corrosion-resistant metal. In particular, those having good adhesion to the potting resin are more preferable.

(Method for producing hollow fiber membrane knitted fabric)
The hollow fiber membrane may be a knitted fabric, and if the hollow fiber membrane is a laminate of several knitted fabrics, for example, wefts, it can be stored in a substantially rectangular opening on the side of the water collecting pipe 2. Is preferred. The production method of the knitted fabric is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 62-57965 and 1-266258.

  By using a foamed resin groove forming jig and a foamable resin as in the present invention, it is possible to easily open a hollow fiber membrane that is fixed, and to easily mass-produce a hollow fiber membrane module.

  The present invention will be specifically described below with reference to examples.

Example 1
Three pieces of porous hollow fiber membranes (Mitsubishi Rayon Co., Ltd., inner diameter 1000 μm, outer diameter 2800 μm) formed by processing PET (polyester) fibers into braids and forming a PVDF porous portion on the surface are combined with wefts. did. Using the wefts, five knitted fabrics having a width of 1000 mm and a knitting length of 2000 mm were knitted to obtain a hollow fiber membrane knitted fabric laminate.

  A groove forming jig was produced with an expanded polystyrene molding machine using “Piocelan O series” (trade name, expansion ratio 10 times, polystyrene / polyolefin composite resin foam, manufactured by Sekisui Plastics Co., Ltd.).

  As a water collecting pipe, an approximately rectangular opening of 18 mm width x 1000 mm length is provided on the side of an ABS square pipe having an outer diameter of 38 mm, an inner diameter of 36 mm, and a length of 1200 mm, and groove forming jigs are provided from both sides of the water collecting pipe. Inserted and sealed with PTFE processing cap.

  Next, the previously prepared hollow fiber membrane knitted fabric laminate was inserted into the opening of the water collecting tube until it hits the recess of the groove forming jig. Then, the foamable resin was filled from the opening to the vicinity of the root of the hollow fiber membrane knitted fabric laminate and solidified. The foamable resin is a two-component foamed urethane resin (“Modeler 800-10A / B”) having a ratio (Vb / V) of the volume after foaming / curing (Vb) to the volume before curing (V) (Vb / V), A product name, manufactured by Solar Co., Ltd., and a two-component non-foamed urethane resin (“Nipporan 4430 / 3100B”, product name, manufactured by Nippon Polyurethane Industry Co., Ltd.) are mixed in an equivalent amount and the foaming ratio is adjusted to 5 times. Using.

  After the solidification, the above-mentioned “Nipporan 4430 / 3100B”, which is a two-component non-foamed urethane resin, was filled on the top of the foamable resin (foamed urethane resin) and solidified.

  Next, the end of the hollow fiber membrane embedded in a foamable resin (foamed urethane resin) was cut by inserting a cutter from the end of the water collection tube. Further, the remaining groove forming jig was removed. Thereafter, a PVC cap with a piping port was bonded to both ends of the water collecting pipe with a solvent.

As described above, a hollow fiber membrane module in which the hollow fiber membrane was fixed to the opening of the water collecting pipe was obtained. The effective membrane area of this hollow fiber membrane module was 25 m ² . Further, no leak was found in the membrane leak test using ethanol.

DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane 2 Water collecting pipe 3 Groove part formation jig 3 'Groove part formation jig 4 which has a hollow 4 Foamable resin 4' Hollow fiber membrane + foamable resin 5 Non-foamable potting resin 5 'Hollow fiber membrane + non-foamable potting Resin 6 Cap 11 Formwork jig 12 Resin

Claims (8)

A hollow fiber membrane module manufacturing method in which a hollow fiber membrane is fixed to a water collection pipe through an opening with a resin,
A step of installing a groove forming jig made of foamed resin provided with a recess so that the tip of the hollow fiber membrane enters in the water collecting pipe;
Arranging the tip of the hollow fiber membrane in the recess through the opening;
A step of curing after filling the recess with a foamable resin;
Filling and curing the non-foaming potting resin on the top of the foamable resin in the recess; and
Cutting the hollow fiber membrane at the portion of the foamable resin;
Removing the remaining groove forming jig;
A method for producing a hollow fiber membrane module, comprising:   The said groove part formation jig | tool is a container made from a foamable fluororesin, The manufacturing method of the hollow fiber membrane module of Claim 1 characterized by the above-mentioned.   The hollow according to claim 1 or 2, wherein the foamable resin has a ratio (Vb / V) of a volume after foaming / curing (Vb) and a volume (V) before curing of 1.1 to 10. A method for manufacturing a yarn membrane module.   The method for producing a hollow fiber membrane module according to any one of claims 1 to 3, wherein the bubble property of the groove forming jig is a closed cell type.   The method for producing a hollow fiber membrane module according to any one of claims 1 to 4, wherein the foamable resin is a urethane resin or an epoxy resin containing a foaming agent.   The method for producing a hollow fiber membrane module according to any one of claims 1 to 5, wherein the non-foaming potting resin is a urethane resin or an epoxy resin.   The method for producing a hollow fiber membrane module according to any one of claims 1 to 6, wherein the hollow fiber membrane is a knitted fabric.   The hollow fiber membrane module according to any one of claims 1 to 7, wherein the cutting is performed by inserting a cutting blade from a side surface of the water collecting pipe and cutting the hollow fiber membrane together with the foamable resin. Production method.

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