JP2017205757A - Manufacturing method of flat type hollow fiber membrane module, gripping tool for manufacturing flat type hollow fiber membrane module and flat type hollow fiber membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a flat type hollow fiber membrane module, a gripping tool for manufacturing the flat type hollow fifer membrane module and the flat type hollow fifer membrane module capable of reducing the number of times of a process of injecting and curing resin while giving looseness to a hollow fiber membrane bundle to only one time with a simple method.SOLUTION: A manufacturing method of a flat type hollow fiber membrane module includes: a process of arranging a pair of looseness forming tools 20, 20 so as to separate the looseness forming tools in the length direction of a hollow fiber membrane bundle 11 and gripping the hollow fiber membrane bundle 11 with the pair of looseness forming fixtures 20, 20; a process of narrowing a separation distance between the pair of looseness forming fixtures 20, 20 and giving the looseness to the hollow fiber membrane bundle 11; a process of inserting an end part of the follow fiber membrane bundle 11 into an insertion port of the housing 12; a fastening process of injecting a fastening resin into the housing 12, curing the fastening resin, fastening the end part of the hollow fiber membrane bundle 11 and fastening end parts of a pair of support pillars 17, 17 to the housing 12; and a process of removing the pair of looseness forming tools 20, 20.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for producing a flat hollow fiber membrane module, a gripping tool for producing a flat hollow fiber membrane module, and a flat hollow fiber membrane module.

The hollow fiber membrane module is used in many applications such as production of aseptic water, drinking water, and highly pure water, and air purification. In recent years, in addition to these applications, hollow fiber membrane modules have undergone secondary treatment and tertiary treatment in sewage treatment plants, solid-liquid separation in septic tanks, and solid-liquid separation of SS (suspended material) in industrial wastewater. It is also used for highly polluted water filtration.
The hollow fiber membrane module generally has a structure in which the end portion of the converging body of the hollow fiber membrane is inserted into the housing and the end portion is opened and the space between the hollow fiber membrane and the housing is fixed with resin.

  When filtering highly polluted water using such a hollow fiber membrane module, a hollow fiber membrane unit in which a plurality of hollow fiber membrane modules are juxtaposed above the air diffuser is immersed in a filtration tank, and air scrubbing is performed. By performing suction filtration while washing, a stable filtration process can be performed over a long period of time. The hollow fiber membrane module is usually subjected to filtration treatment in a relaxed state in which the hollow fiber membrane is slackened by about 0.1 to 5% in the length direction for the purpose of improving the cleaning effect by air scrubbing cleaning. Done.

  As described above, as a method of forming and imparting slack to the hollow fiber membrane module, for example, a method of adjusting the distance between the housings to which the ends of the hollow fiber membrane bundles are fixed to impart slack, or By providing a column between the housings, a method of fixing the distance between the housings to a predetermined distance in advance can be used.

Such a hollow fiber membrane module can be manufactured, for example, by the following method (see Patent Document 1).
First, a plurality of hollow fiber membranes are aligned and their ends are placed in a container. Next, a liquid resin for fixing is injected into the container and cured, whereby the ends of the hollow fiber membranes are fixed with the fixing resin to form a hollow fiber membrane bundle (first curing step). Next, the container is removed from the hollow fiber membrane focusing body, and the ends of the hollow fiber membranes fixed with the fixing resin are cut together with the resin, so that the hollow fiber membrane focusing bodies (hollow fibers) in which the ends of the hollow fiber membranes are opened. Yarn membrane bundle) is obtained (cutting step). Thereafter, the open end of the hollow fiber membrane bundle is inserted into the housing, and the adhesive resin is poured onto the cured fixing resin, which is cured to fix the hollow fiber membrane to the housing (second). In the curing step) to obtain a hollow fiber membrane module.

  Further, for example, in the case where the hollow fiber membrane module having the configuration described in Patent Document 1 is provided with a support, a frame formed by previously bonding the housing and the support is prepared, and each hollow fiber is prepared. A hollow fiber membrane bundle having an open end of the membrane is fixed in the housing. At this time, by making the length dimension of the hollow fiber membrane bundle larger than the predetermined fixed length depending on the length of the support column, the whole hollow fiber membrane bundle can be in a relaxed and relaxed state.

JP 2006-061816 A

  However, in the manufacturing method of the conventional hollow fiber membrane module described in Patent Document 1, the first curing step and the second curing step are required twice as a step of injecting and curing the resin. Therefore, there is a problem that the process becomes complicated. Moreover, even when it was set as the structure which provided the support | pillar to the above hollow fiber membrane modules, there existed a problem that a hardening process was needed twice in total like patent document 1, and a process became complicated.

  The present invention has been made in view of the above problems, and in producing a hollow fiber membrane module provided with struts, a resin is injected while forming and imparting slack to the hollow fiber membrane bundle by a simple method. An object of the present invention is to provide a flat hollow fiber membrane module manufacturing method, a flat hollow fiber membrane module manufacturing gripper, and a flat hollow fiber membrane module that can reduce the curing step only once and have excellent production efficiency. And

The inventors of the present invention have made extensive studies in order to achieve the above object. As a result, first, after the hollow fiber membrane bundle is provided with relaxation by holding the vicinity of both ends in the length direction of the hollow fiber membrane bundle with a pair of relaxation forming jigs and narrowing the separation distance between these relaxation forming jigs After inserting the end of the hollow fiber membrane bundle from the insertion port of the housing, a method of injecting a fixing resin into the housing and curing it is used to impart a slack to the hollow fiber membrane bundle by a simple method. However, it has been found that the process of curing the fixing resin can be reduced only once, and the present invention has been completed.
That is, this invention includes the following aspects.

[1] A housing having a water collection channel is provided, and each end of a sheet-like hollow fiber membrane bundle made of a plurality of hollow fiber membranes is inserted into the housing from each insertion port of the housing and fixed. In addition, the ends of each of the pair of struts arranged along the length direction of the hollow fiber membrane bundle on both sides of the hollow fiber membrane bundle in the arrangement direction of the hollow fiber membrane bundle are fixed to the housing. A flat hollow fiber membrane module manufacturing method comprising: a pair of relaxation forming jigs arranged apart from each other in the length direction of the hollow fiber membrane bundle; and the hollow fiber membrane bundles arranged in the pair of relaxation forming jigs A holding step for holding the hollow fiber membrane bundle by relaxing a separation distance between the pair of relaxation forming jigs, and an end of the hollow fiber membrane bundle at the insertion port of the housing. An insertion step of inserting a portion into the housing A fixing resin is injected and cured to fix the ends of the hollow fiber membrane bundle, and the fixing step of fixing the ends of the pair of struts to the housing and the pair of relaxation forming jigs are removed. A method for producing a flat hollow fiber membrane module, comprising a removing step.
[2] A housing having a water collecting channel is provided, and each end of a sheet-like hollow fiber membrane bundle made of a plurality of hollow fiber membranes is inserted into the housing from each insertion port of the housing and fixed. In addition, the ends of each of the pair of struts arranged along the length direction of the hollow fiber membrane bundle on both sides of the hollow fiber membrane bundle in the arrangement direction of the hollow fiber membrane bundle are fixed to the housing. A flat hollow fiber membrane module manufacturing method comprising: a pair of relaxation forming jigs arranged apart from each other in the length direction of the hollow fiber membrane bundle; and the hollow fiber membrane bundles arranged in the pair of relaxation forming jigs A holding step for holding the hollow fiber membrane bundle by relaxing a separation distance between the pair of relaxation forming jigs, and an end of the hollow fiber membrane bundle at the insertion port of the housing. Insertion step of inserting the part and the housing, front A holding step of assembling the hollow fiber membrane bundle and the pair of struts into a frame of a holding frame that is substantially rectangular in plan view, and a connecting step of connecting and fixing the pair of relaxation forming jigs to the holding frame A fixing step of injecting and curing a fixing resin into the housing and curing to fix the ends of the hollow fiber membrane bundle, and fixing the ends of the pair of struts to the housing; and the holding frame And a removing step of removing the body and the pair of relaxation forming jigs.
[3] The flat mold according to [1] or [2], wherein the relaxation forming jig is provided with an elastic member having a hardness of 3 to 20 degrees in a grip portion that grips the hollow fiber membrane bundle. Manufacturing method of hollow fiber membrane module.
[4] The method for manufacturing a flat hollow fiber membrane module according to any one of [1] to [3], wherein the relaxation forming jig has a thickness of the elastic member of 2 mm or more.
[5] The ratio (L / W) of the total width W of the flat hollow fiber membrane module to the total length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in the range of 10 to 60 times. The method for producing a flat hollow fiber membrane module according to any one of [1] to [4] above.
[6] The ratio (L / W) of the total width W of the flat hollow fiber membrane module to the total length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in the range of 20 to 50 times. The method for producing a flat hollow fiber membrane module according to any one of [1] to [4] above.
[7] The flat hollow fiber according to any one of [1] to [6], wherein an overall length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in a range of 300 to 1500 mm. Membrane module manufacturing method.
[8] The flat hollow fiber according to any one of [1] to [6], wherein an overall length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in a range of 500 to 1250 mm. Membrane module manufacturing method.
[9] Any of the above [1] to [8], wherein the weight of the hollow fiber membrane bundle per gripping area of the flat hollow fiber membrane module by the gripping portion of the relaxation forming jig is 50 g / cm ² or less. A method for producing the flat hollow fiber membrane module according to claim 1.
[10] Used in the method for producing a flat hollow fiber membrane module according to any one of [1] to [9] above, until the hollow fiber membrane bundle is fixed to the housing with a fixing resin. A flat hollow fiber membrane module manufacturing gripper for gripping and supporting a hollow fiber membrane bundle, the first member and the second member gripping so as to sandwich the hollow fiber membrane bundle by being close to each other, and A sandwiching means capable of bringing the first member and the second member close to each other so that a separation distance between the first member and the second member is smaller than a thickness of the hollow fiber membrane bundle; A gripping tool for producing a flat hollow fiber membrane module.
[11] Housings having water collecting channels are respectively provided on both sides in the longitudinal direction of the hollow fiber membrane, and both end portions of a sheet-like hollow fiber membrane bundle composed of a plurality of the hollow fiber membranes are respectively provided in the housings. Inserted into the housing through a fixing resin, and disposed along the hollow fiber membrane bundle on both sides of the hollow fiber membrane bundle in the arrangement direction of the hollow fiber membranes. Both ends of a pair of struts are each a flat hollow fiber membrane module fixed to each of the housings, and both ends of the pair of struts are respectively inserted from the insertion ports of the housings. The hollow fiber membrane bundle is fixed in a relaxed state between each of the housings arranged on both sides in the longitudinal direction of the hollow fiber membrane. In the cross section when the housing is cut at a position of 30 mm from the insertion port toward the water collecting flow path side in the housing, a kind of the fixing resin is provided between the hollow fiber membrane bundle and the housing. Flat hollow fiber membrane module filled liquid-tight without an interface.

  According to the flat hollow fiber membrane module manufacturing method of the present invention, after the step of imparting relaxation to the hollow fiber membrane bundle, the end of the hollow fiber membrane bundle is inserted into the housing, and then fixed in the housing. By adopting the method of injecting and curing the resin for use, the step of injecting and curing the fixing resin can be reduced to only one while giving a slack to the hollow fiber membrane bundle by a simple method. Therefore, it is possible to manufacture a flat hollow fiber membrane module having excellent handling properties with excellent production efficiency.

It is a figure which illustrates typically an example of the flat hollow fiber membrane module obtained with the manufacturing method which concerns on this invention, (a) is a whole perspective view, (b), (c) is a principal part expanded sectional view. . BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically 1st Embodiment of the manufacturing method of the flat type hollow fiber membrane module which concerns on this invention, and uses the raising jig used for raising and positioning a sheet-like hollow fiber membrane bundle. It is a figure which shows, (a) is a top view, (b) is a side view. It is a figure explaining typically a 1st embodiment of a manufacturing method of a flat type hollow fiber membrane module concerning the present invention, and has arranged the 1st member which constitutes a pair of relaxation formation jigs in the crevice between bottom raising jigs. It is a figure which shows a state, (a) is a top view, (b) is a side view. It is a figure which illustrates typically 1st Embodiment of the manufacturing method of the flat type hollow fiber membrane module which concerns on this invention, and is sheet-like hollow on the 1st member of a bottom raising jig and a pair of relaxation formation jigs It is a figure which shows the state which has arrange | positioned the thread membrane bundle and a pair of support | pillar, (a) is a top view, (b) is a side view. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically 1st Embodiment of the manufacturing method of the flat type hollow fiber membrane module which concerns on this invention, and a pair of relaxation formation treatment in the vicinity of the both ends of the length direction of a sheet-like hollow fiber membrane bundle It is a figure which shows the holding process which arrange | positions the 2nd member which comprises a tool, and holds a hollow fiber membrane bundle with a 1st member and a 2nd member, (a) is a top view, (b) was seen from the side surface side FIG. It is a figure which illustrates typically a 1st embodiment of a manufacturing method of a flat type hollow fiber membrane module concerning the present invention, and forms relaxation in a hollow fiber membrane bundle by narrowing a separation distance of a pair of relaxation formation jigs -It is a figure which shows the relaxation process to provide, (a) is a top view, (b) is the partial fracture | rupture schematic seen from the side surface side. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically 1st Embodiment of the manufacturing method of the flat type hollow fiber membrane module which concerns on this invention, and is housing the both ends of the hollow fiber membrane bundle to which relaxation was provided, and the both ends of a pair of support | pillar It is a figure which shows the insertion process inserted in this insertion port, (a) is a top view, (b) is the partial fracture | rupture schematic seen from the side surface side. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically 1st Embodiment of the manufacturing method of the flat type hollow fiber membrane module which concerns on this invention, the housing maintained in the substantially horizontal state, the hollow fiber membrane bundle, and a pair of support | pillar, It is a figure which shows the state which made this the upright state after the holding | maintenance process assembled | attached in the frame of a body, (a) is a top view, (b) is a side view. It is a figure which illustrates typically a 1st embodiment of a manufacturing method of a flat type hollow fiber membrane module concerning the present invention, and is a figure showing a pair of relaxation formation jigs in detail, (a) and (b) The 1st member by which the elastic member was used for the holding part, (c), (d) is a schematic diagram showing the 2nd member.

  Hereinafter, the flat hollow fiber membrane module, the flat hollow fiber membrane module manufacturing gripper, and the flat hollow fiber membrane module according to the present invention will be described with reference to the first and second embodiments, and FIGS. This will be described in detail with appropriate reference. In addition, each drawing used in the following description may show the characteristic part in an enlarged manner for convenience in order to make the feature easy to understand, and the dimensional ratio of each component is different from the actual case. There is. In addition, the materials, dimensions, and the like exemplified in the following description are examples, and the present invention is not limited to them, and can be appropriately changed and implemented without changing the gist thereof.

<Flat hollow fiber membrane module>
FIG. 1 is a diagram schematically illustrating an example of a flat hollow fiber membrane module obtained by the manufacturing method according to the present invention, where (a) is an overall perspective view and (b) is a diagram illustrating a state in which a hollow fiber membrane bundle is fixed. The main part expanded sectional view which shows the perpendicular | vertical cross section of the housing and its vicinity which show, (c) is the principal part expanded sectional view which shows the vertical section of the housing to which a support | pillar is fixed, and its vicinity.

  A flat hollow fiber membrane module 1 illustrated in FIGS. 1A, 1B, and 1C includes a sheet-like hollow fiber membrane bundle 11 in which a plurality of hollow fiber membranes are bundled into a sheet shape, Two housings 12 for fixing both end portions (end portions in the length direction) of the thread membrane bundle 11 and both end portions (end portions in the length direction) of the pair of support columns 17 and 17 via the fixing resin 2; And has a schematic configuration. Further, the flat hollow fiber membrane module 1 is configured such that the sheet-like hollow fiber membrane bundle 11 has a slight slack (relaxation) as shown in the illustrated example.

  More specifically, the flat hollow fiber membrane module 1 includes housings 12 and 12 each having a water collecting channel 15 provided on both sides in the longitudinal direction of the hollow fiber membrane, and is formed into a sheet-like shape composed of a plurality of hollow fiber membranes. Both end portions 11A and 11A of the hollow fiber membrane bundle 11 are inserted from the insertion ports 12a of the housings 12 and 12, respectively, and are fixed in the housings 12 and 12 through the fixing resin 2. The flat hollow fiber membrane module 1 has both ends 17a and 17a of a pair of support columns 17 and 17 arranged along the hollow fiber membrane bundle 11 on both sides of the hollow fiber membrane bundle 11 in the arrangement direction of the hollow fiber membranes. , Each of which is fixed to each of the housings 12.

  In the flat hollow fiber membrane module 1 according to the present embodiment, both ends 17a and 17a of the pair of support columns 17 and 17 are inserted from the insertion ports 12a of the housings 12 and 12, respectively. It is being fixed so that it may be embedded in the housings 12 and 12 via. Further, the hollow fiber membrane bundle 11 is fixed in a relaxed state between the housings 12 and 12 disposed on both sides in the longitudinal direction of the hollow fiber membrane. Further, the flat hollow fiber membrane module 1 includes the hollow fiber membrane bundle 11 and the housing in a cross section when the housing 12 is cut at a position of 30 mm from the insertion port 12a toward the water collecting flow path 15 in the housing 12. A kind of fixing resin 2 is filled in a liquid-tight manner with no interface.

In the present specification, the state of “without interface” refers to a state when a kind of fixing resin is molded by a single resin injection. On the other hand, the state of “having an interface” refers to a state when at least one kind of fixing resin is molded by resin injection twice or more.
Here, “single resin injection” refers to resin injection until the injected resin reaches 200,000 mPa · s.

[Hollow fiber membrane bundle]
The hollow fiber membrane bundle 11 is a bundle of a plurality of hollow fiber membranes, and at least one end thereof is open. The fractionation level of the hollow fiber membrane used in the present invention may be any level such as a microfiltration membrane (MF), an ultrafiltration membrane (UF), or a nanofiltration membrane (NF). The hollow fiber membrane bundle is not particularly limited as long as it can be used as a filtration membrane, and is appropriately selected depending on the object to be filtered. Furthermore, as the hollow fiber membrane bundle, an ultrafiltration membrane having a fractional molecular weight of tens of thousands to several hundreds of thousands may be used for the purpose of removing organic substances and viruses.

  The hollow fiber membrane used in the present invention is, for example, a cellulose-based resin, a polyolefin-based resin, a polyvinyl alcohol-based resin, a polysulfone-based resin, a polyacrylonitrile-based resin, a chlorine-based resin, a fluorine-based resin, or the like as a separation membrane. Any material can be used as long as it can be formed into a shape. Specific examples of such a material include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, and polysulfone.

  As the surface characteristics of the hollow fiber membrane, it is preferable to use a resin having high chemical resistance, and specifically, it is preferable to use a fluororesin. Among fluororesins, it is more preferable to use vinylidene fluoride resin from the viewpoints of formability to the hollow fiber membrane and chemical resistance. Here, examples of the vinylidene fluoride resin include a copolymer of vinylidene fluoride and a monomer copolymerizable therewith, in addition to a homopolymer of vinylidene fluoride. Examples of such a copolymerizable monomer include vinyl fluoride, tetrafluoroethylene, ethylene trifluoride, hexafluoropropylene, and the like.

  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 is preferably 0.01 to 5 μm, for example, and more preferably 0.1 to 1 μm.

  The hollow fiber membrane preferably has a two-layer structure. Furthermore, the hollow fiber membrane preferably has an asymmetric structure in which the pore diameter on one layer surface is small and the pore diameter on the other layer surface is large. When the hollow fiber membrane has an asymmetric structure, the pore diameter of one layer surface is preferably more than 1 and 100 times or less, more preferably 2 to 10 times the pore diameter of the other layer surface.

For example, the outer diameter of the hollow fiber membrane is preferably 0.1 to 5 mm, and more preferably 0.5 to 3 mm.
Further, the hollow fiber membrane preferably has a pure water permeability coefficient indicating a liquid permeation performance with respect to pure water of 1 to 250 m ³ / m ² / hr / MPa, and is 10 to 150 m ³ / m ² / hr / MPa. More preferably. The pure water permeability coefficient can be obtained by the following equation (1).
Pure water permeability coefficient = [pure water permeation amount (m ³ )] / [surface area of porous membrane (m ² )] / [permeation time (hours)] / [pure water pressure (MPa)] (1)

  As a form of the hollow fiber membrane bundle, for example, a sheet-shaped hollow fiber membrane arranged in one row and at least one side end fixed with an adhesive or the like is laminated in about several sheets. Moreover, as a hollow fiber membrane bundle, what laminated | stacked several sheets made from the knitted fabric which used the hollow fiber membrane as the weft is mentioned, for example. Such a method for producing a knitted fabric is disclosed in, for example, Japanese Patent Laid-Open Nos. 62-57965 and 1-266258. Further, a bundle of a plurality of hollow fiber membranes may be adopted as a bundle of hollow fiber membranes.

  The arrangement direction of the hollow fiber membranes in the hollow fiber membrane bundle 11 is not particularly limited, but it is preferable that the hollow fiber membranes are arranged substantially parallel to the flow direction of the liquid to be treated. In such a case, for example, in a case where the liquid to be treated is a highly contaminated liquid containing a large amount of contaminants, when the contaminants pass between a large number of hollow fiber membranes, Since there is no obstacle such as a hollow fiber membrane, the effect of reducing the accumulation and constriction of impurities on the hollow fiber membrane can be obtained.

  Furthermore, as for the arrangement direction of the hollow fiber membranes, the length direction of the hollow fiber membranes is preferably the vertical direction, that is, the vertical direction. In such a case, for example, the upward flow direction of the liquid to be treated that occurs during air bubbling cleaning often used for cleaning contaminants and the extending direction of the hollow fiber membrane can be made substantially parallel. A synergistic effect with the effect of preventing the accumulation of impurities described above can be obtained.

[housing]
As shown in FIGS. 1A, 1B and 1C, the housing 12 supports the entire flat hollow fiber membrane module 1 and collects treated water filtered by the hollow fiber membrane bundle 11. In the illustrated example, a pair of hollow fiber membrane bundles 11 are provided at both ends in the length direction. The housing 12 in the illustrated example has a tubular shape, and as shown in FIGS. 1B and 1C, a slit-like insertion port 12a into which the sheet-like hollow fiber membrane bundle 11 and the pair of support columns 17 and 17 are inserted is provided. A cross section formed along the longitudinal direction and perpendicular to the longitudinal direction (hereinafter referred to as a vertical cross section) is U-shaped.

  The hollow fiber membrane bundle 11 is inserted from the insertion port 12 a toward the bottom 13 side of the housing 12, and the opening end surface 11 a is fixed by the fixing resin 2 while being opened in the housing 12. Specifically, the hollow portion formed in the longitudinal direction of the housing 12 so as to be surrounded by the bottom portion 13 of the housing 12, the open end surface 11a of the hollow fiber membrane bundle 11 and the fixing resin 2 is treated with treated water. The water collecting flow path 15 is configured to collect water, and the open end surface 11 a of the hollow fiber membrane bundle 11 is open in the water collecting flow path 15. Further, in the housing 12 in the example shown in FIG. 1A, a water collection port 16 for collecting the treated water collected in the water collection channel 15 is formed in a part of the side surface 14 of the housing.

  In addition, although the opening end surface 11a of the hollow fiber membrane bundle 11 in the illustrated example is arranged so as to be flush with the surface of the fixing resin 2 on the water collecting channel 15 side, it is fixed toward the water collecting channel 15. It is preferable from the viewpoint of water collection efficiency and the like to be disposed so as to protrude from the resin 2 for use.

  The material of the housing 12 is not particularly limited as long as it has mechanical strength and durability. For example, polycarbonate, polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, or modified PPE (polyphenylene ether) or the like can be used. Further, when the incineration treatment of the hollow fiber membrane module after use is necessary, a hydrocarbon-based resin such as polyolefin that can be completely burned without generating a toxic gas at the time of burning is preferable.

[Prop (a pair of props)]
As shown in FIGS. 1A and 1C, the pair of support columns 17 and 17 are rod-shaped (tubular) members that connect both ends of the housings 12 and 12 provided as a pair. , 17 keeps a constant distance between the pair of housings 12, 12, and also keeps the shape of the entire flat hollow fiber membrane module 1. Thereby, the surface form of the sheet-like hollow fiber membrane bundle 11 is maintained, and a flat hollow fiber membrane module is formed as a whole. As described above, the flat hollow fiber membrane module 1 is provided with the pair of support columns 17, 17 so that the flat hollow fiber membrane module 1 can be manufactured, transported and stored, and assembled / removed to / from the hollow fiber membrane unit. The handleability during the process is improved. In addition, such a configuration can simplify the structure of the hollow fiber membrane unit.

The material and shape of the pair of struts 17 and 17 are not particularly limited, and a metal material or a resin material is used while taking into consideration the mechanical strength, mechanical durability, and chemical durability of the flat hollow fiber membrane module 1. Regardless, it can be selected as appropriate.
In view of the above, when a metal material is used as the material of the pair of support columns 17, 17, for example, a stainless material is preferably used from the viewpoint of corrosion resistance. Moreover, when using a resin material for the pair of support columns 17, 17, for example, polycarbonate, polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, or modified PPE (polyphenylene ether) is used. Can do.

Moreover, as a shape of a pair of support | pillars 17 and 17, a cross-sectional shape may be circular or a rectangular shape, and may be a rod shape or a tubular shape (pipe shape).
Here, when a tubular member is used for the pair of struts 17, 17, as illustrated in FIG. 1C, the pair is connected to the water collecting flow path 15 in the housing 12. It is also possible to provide a function as a water conduit between the provided housings 12 and 12.

[Fixing resin]
As the fixing resin 2 for fixing the hollow fiber membrane bundle 11 and the pair of support columns 17 and 17 to the housings 12 and 12, for example, a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, or a polyurethane resin is preferable. Used for.

  The viscosity of the fixing resin 2 when the fixing resin 2 is filled, that is, the initial viscosity, is preferably as small as possible from the viewpoint of filling the gap between the hollow fiber membranes. On the other hand, if the initial viscosity is too small, the hollow portion of each hollow fiber membrane is likely to be blocked with the fixing resin. From these viewpoints, the initial viscosity of the fixing resin 2 is preferably 100 mPa · s or more, more preferably 200 mPa · s or more, further preferably 250 mPa · s or more, and preferably 5000 mPa · s or less, more preferably. Is 3000 mPa · s or less, more preferably 1000 mPa · s or less.

Further, in the flat hollow fiber membrane module 1 according to the present invention, the hardness of the fixing resin 2 after curing is measured using a type A durometer in accordance with JIS K6253, with a Shore A hardness after 10 seconds. It is preferably in the range of 80 to 99 degrees.
Thus, by setting the hardness after hardening of the fixing resin 2 relatively high, the rigidity of the fixing resin 2 and the housing 12 in which the fixing resin 2 is fitted is secured, and the pressure resistance is increased. Can be increased. In particular, if the Shore A hardness after 10 seconds is 80 degrees or more, sufficient pressure resistance can be ensured with a smaller amount of resin, so the amount of the fixing resin 2 used can be reduced, and the flat hollow fiber membrane The cost of the module 1 can be reduced. On the other hand, if the Shore A hardness after 10 seconds is 99 degrees or less, the fixing resin 2 can be prevented from cracking.

  As described above, the flat hollow fiber membrane module 1 of the present embodiment has a cross section when the housing 12 is cut at a position of 30 mm from the insertion port 12a toward the water collecting flow path 15 in the housing 12, A kind of fixing resin 2 is filled between the hollow fiber membrane bundle 11 and the housing 12 in a liquid-tight manner without an interface. Such a configuration in which a kind of fixing resin 2 is filled in a liquid-tight manner without an interface, for example, when the fixing resin 2 is filled in the housing 12, the fixing resin 2 is injected only in one step. Then, it is obtained by filling a kind of fixing resin 2 between the hollow fiber membrane bundle 11 and the housing 12. Thereby, the flat hollow fiber membrane module of this embodiment will be in the state in which the hollow fiber membrane bundle 11 was firmly fixed in the housing 12.

  Further, the fixing resin for fixing the hollow fiber membrane bundle 11 and the fixing resin for fixing the pair of support columns 17 and 17 may be made of different resins.

[Dimensions of flat hollow fiber membrane module]
The flat hollow fiber membrane module 1 obtained by the method for producing a flat hollow fiber membrane module according to the present invention has a ratio (L / W) between the full width W and the full length L shown in FIG. The range is preferably 60 times, more preferably 20 to 50 times. By setting the ratio (L / W) between the overall width W of the flat hollow fiber membrane module 1 and the total length L of the hollow fiber membrane modules 1 in the arrangement direction of the hollow fiber membranes to be in the above range, the hollow fiber membranes Predetermined dimensions and shape as a module are maintained, excellent filtration performance is obtained, and handling properties are excellent.

  Further, the flat hollow fiber membrane module 1 obtained by the production method of the present embodiment preferably has a total length L in the arrangement direction of the hollow fiber membranes shown in FIG. A range of 500 to 1250 mm is more preferable. By setting the total length L of the flat hollow fiber membrane module 1 in the arrangement direction of the hollow fiber membranes within the above range, the predetermined dimensions and shape are maintained as described above, and the filtration performance and the handleability are excellent.

[Relaxation rate of hollow fiber membrane bundle]
In the flat hollow fiber membrane module 1 according to the present invention, the relaxation rate of the hollow fiber membrane bundle 11 in a state where the hollow fiber membrane bundle 11 and the pair of support columns 17 and 17 are fixed to the housings 12 and 12 is as follows (1 ) Expression.
Relaxation rate (%) = {(length of hollow fiber membrane bundle) − (distance between housings)} / {distance between housings} (1)

  The relaxation rate of the hollow fiber membrane bundle 11 represented by the above formula (1) is preferably 0.1 to 5%, more preferably 0.3 to 3%, and more preferably 0.5 to 1.5%. If the relaxation rate of the hollow fiber membrane bundle 11 is smaller than the above lower limit, the yarn is less likely to shake and the physical cleaning properties by aeration may be reduced. On the other hand, when the relaxation rate of the hollow fiber membrane bundle 11 exceeds the above upper limit, the yarn is entangled and hardly shakes, and similarly to the above, the physical detergency by aeration is lowered.

<Method for producing flat hollow fiber membrane module (gripping tool for producing flat hollow fiber membrane module)>
[First Embodiment]
The manufacturing method of the flat hollow fiber membrane module of this embodiment is a method of manufacturing the flat hollow fiber membrane module 1 as illustrated in FIGS. That is, the manufacturing method of the present embodiment includes a housing 12 having a water collecting flow path 15, and each end portion 11 </ b> A of a sheet-like hollow fiber membrane bundle 11 made of a plurality of hollow fiber membranes is inserted into each housing 12. A pair of struts 17 that are inserted into the housing 12 through the opening 12a and fixed, and disposed along the length direction of the hollow fiber membrane bundle 11 on both sides of the hollow fiber membrane bundle 11 in the arrangement direction of the hollow fiber membranes, 17 is a method of manufacturing a flat hollow fiber membrane module 1 in which each end 17a of 17 is fixed to a housing 12.

And the manufacturing method of this embodiment is a method including each process shown to the following (1)-(5) at least.
(1) A pair of relaxation forming jigs (flat hollow fiber membrane module manufacturing gripping tools) 20 and 20 are arranged apart from each other in the length direction of the hollow fiber membrane bundle 11, and the hollow fiber membrane bundle 11 is paired with a pair of relaxations. A gripping step of gripping with the forming jigs 20 and 20.
(2) A relaxation step of imparting relaxation to the hollow fiber membrane bundle 11 by narrowing the distance between the pair of relaxation forming jigs 20 and 20.
(3) An insertion step of inserting the end portion 11A of the hollow fiber membrane bundle 11 into the insertion port 12a of the housing 12.
(4) The fixing resin 2 is injected into the housing 12 and cured to fix the end portion 11A of the hollow fiber membrane bundle 11, and the end portions 17a of the pair of support columns 17 and 17 are fixed to the housing 12. Process.
(5) A removal step of removing the pair of relaxation forming jigs 20 and 20.

  Hereinafter, each of the above steps will be described with reference to the corresponding drawings.

(1) Grasping step In the grasping step, as described above, the pair of relaxation forming jigs 20 and 20 are arranged apart from each other in the length direction of the hollow fiber membrane bundle 11, and the hollow fiber membrane bundle 11 is paired with a pair of relaxations. Grip with the forming jigs 20 and 20.

In the manufacturing method of this embodiment, prior to the gripping process, first, a bottom raising jig 40 as shown in FIGS. 2A and 2B is placed on the work table.
The bottom raising jig 40 is formed in a long and groove-like shape with a gap 41 for arranging a pair of relaxation forming jigs 20 and 20 to be described in detail later. (See also FIGS. 3A and 3B). In the bottom raising jig 40 used in the present embodiment, the relative positional relationship between the components of the flat hollow fiber membrane module 1 is roughly the same as the relative positional relationship when the finished product of the flat hollow fiber membrane module 1 is placed flat. It is comprised so that it may become the same.
Further, the bottom raising jig 40 in the illustrated example is a portion disposed outside the gap portion 41 in the width direction in FIGS. 2A and 2B in consideration of installation of the housing 12 in an insertion process described later. However, the height is lower than that of the central portion.

Furthermore, in the illustrated example of the bottom raising jig 40, the groove-like gap portion 41 is formed on the pair of relaxation forming jigs 20, 20 so that the hollow fiber membrane bundle 11 can be relaxed in the relaxation process described later. Among them, the shape / dimension is such that the relaxation forming jig 20 arranged on the right side in the width direction in FIGS. 3A and 3B can be slid in the length direction of the hollow fiber membrane bundle 11. (See also FIGS. 6A and 6B).
Although the material of the bottom raising jig | tool 40 is not specifically limited, For example, it can comprise from foamed resin, such as a polystyrene.

  A pair of relaxation forming jigs (flat hollow fiber membrane module manufacturing gripping tools) 20, 20 used in the present embodiment are first used in combination with each other as shown in FIGS. It consists of a member 21 and a second member 22. The relaxation forming jig 20 holds the hollow fiber membrane bundle 11 while imparting a desired relaxed state to the hollow fiber membrane bundle 11 until the hollow fiber membrane bundle 11 is fixed to the housing 12 with the fixing resin 2 in the fixing step described later. It is. The relaxation forming jig 20 of the illustrated example grips the hollow fiber membrane bundle 11 so that the first member 21 and the second member 22 come close to each other, and the first member 21 and the second member 22 are sandwiched therebetween. And a bolt (clamping means) 26 that can bring the first member 21 and the second member 22 close to each other so that the distance between them is smaller than the thickness of the hollow fiber membrane bundle 11. The

  As shown in FIGS. 9A and 9B, the first member 21 includes a base material 23, a spacer 24, and an elastic member (gripping part) 25. In addition, as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, the first member 21 is preliminarily gripped in the vicinity of both end portions 11A and 11A of the hollow fiber membrane bundle 11. In addition, it is used by being disposed in advance in the gap 41 in the bottom raising time portion 40.

The base material 23 is a long member having a substantially U-shaped cross section, and is a member serving as a base of the first member 21. Further, the base material 23 is provided with a bolt insertion hole 23 b for fixing the spacer 24 with a bolt 26.
The material of the base material 23 is not particularly limited. When the first member 21 and the second member 22 are connected and fixed, that is, when the hollow fiber membrane bundle 11 is gripped by the relaxation forming jig 20, the hollow fiber is formed. It is necessary to appropriately select a material having sufficient mechanical strength to suppress warping of the relaxation forming jig 20 due to the reaction force of the membrane bundle 11 and to support the weight of the hollow fiber membrane bundle 11. Examples of the material used for the base material 23 having such mechanical strength include a stainless steel material.

The spacer 24 is a member provided on the upper surface 23a side of the base material 23 having a substantially U-shaped cross section, and ensures a certain distance when the first member 21 and the second member 22 are combined and fixed. To function as a stopper. Thereby, when the hollow fiber membrane bundle 11 is gripped by the relaxation forming jig 20, the hollow fiber membrane bundle 11 can be prevented from being damaged. In addition, the spacer 24 is provided with a bolt insertion hole 24 a for fixing the spacer 24 to the base material 23 and fastening the second member 22 and the bolt 26 together.
The material of the spacer 24 is not particularly limited, and for example, a resin material that is excellent in workability and excellent in mechanical strength, such as polyacetal resin, can be used.

  The elastic member 25 has a function of uniformly applying a surface pressure so as to conform to the irregularities when the hollow fiber membrane bundle 11 having irregularities on the surface is gripped. If the hollow fiber membrane bundle is gripped without providing an elastic member on the relaxation forming jig, the hollow fiber membrane may be damaged, or the membrane bundle may be displaced when the gripping force is weakened. is there.

The material, thickness, and hardness of the elastic member 25 are not particularly limited, but can be appropriately selected according to the width, thickness, weight, and the like of the hollow fiber membrane bundle 11 that is the object to be grasped.
The material of the elastic member 25 is preferably an elastic body because the degree of change in the amount of deflection is large. Examples of the elastic body include various rubbers (urethane rubber, silicon rubber, fluorine rubber, natural rubber, butyl rubber, ethylene propylene rubber, chloroprene rubber, etc.), various rubber sponges, soft polyurethane, soft polyvinyl chloride, or foam. Body (polyethylene, polystyrene, ethylene vinyl acetate copolymer, etc.) and the like, and are selected from various rubber materials and sponge materials.

The hardness of the elastic member 25 is a sponge hardness using an Asker C-type hardness meter conforming to SRIS 0101 (Japan Rubber Association standard), preferably 1 to 30 degrees, more preferably 3 to 20 degrees, and more preferably 5 to 10 degrees. Most preferred. If the hardness of the elastic member 25 is within this range, the hollow fiber membrane bundle 11 can be securely gripped without being damaged.
The thickness of the elastic member 25 is preferably 2 mm or more in consideration of grasping the hollow fiber membrane bundle 11, more preferably 2 to 30 mm, further preferably 3 to 20 mm, and most preferably 5 to 10 mm. If the thickness of the elastic member 25 is in the above range, the hollow fiber membrane bundle can be securely gripped without being damaged.

  In the manufacturing method according to the present invention, when the hollow fiber membrane bundle 11 gripped by the relaxation forming jig 20 is extremely lightweight, the elastic member 25 can be omitted.

As shown in FIGS. 9C and 9D, the second member 22 is a long member having a substantially U-shaped cross section, like the base member 23 of the first member 21, and the lower surface 22a is the first member. The hollow fiber membrane bundle 11 is sandwiched and held between the elastic member 25 of the member 21. In addition, the second member 22 is provided with a bolt insertion hole 22 b for being fixed with a bolt 25 in combination with the first member 21.
The material of the second member 22 is required to have sufficient mechanical strength to suppress warpage and to support the weight of the hollow fiber membrane bundle 11, as with the base material 23 of the first member 21. Therefore, it is preferable to use a stainless steel material or the like.

  Here, both ends in the length direction of the base member 23 of the first member 21 and both ends in the length direction of the second member 22 are a connecting portion 23A and a connecting portion 22A, respectively, and are shown in FIG. Thus, when attaching to the support | pillar 17 in the state which hold | gripped the hollow fiber membrane bundle 11 with the relaxation formation jig | tool 20, this position is fixed with a vise etc., for example.

  Further, at least one of the first member 21 and the second member 22 is provided with a relaxation forming jig 20 on a holding frame 30 (see FIGS. 8A and 8B) described in a second embodiment described later. A connecting portion including a bolt insertion hole (not shown) for connecting and fixing is provided. Here, when the connecting portion is provided on the first member 21, the position is set in the vicinity of both ends in the length direction of the base member 23, and when the connecting portion is provided on the second member 22, the position is the length of the second member 22. What is necessary is just to be near the both ends in the vertical direction.

  And in the holding process of this embodiment, after preparing the bottom raising jig 40 as described above, as shown in FIGS. The first members 21 and 21 constituting the pair of relaxation forming jigs 20 and 20 are set apart from each other.

Next, as shown in FIGS. 4A and 4B, a predetermined number of the hollow fiber membrane bundle 11 and the pair of struts 17 and 17 are set at predetermined positions on the bottom raising jig 40 and the first member 21. . At this time, by setting a ruled line 42 based on a desired dimension value on the surface of the bottom raising jig 40 in advance, the set position can be adjusted according to the total length of the hollow fiber membrane bundle 11.
Thus, when the setting position of the hollow fiber membrane bundle 11 is indicated by ruled lines in advance, for example, the hollow fiber membrane bundle 11 is placed substantially horizontally on the bottom raising jig 40 and the bottom raising jig 40 is placed. Various positioning lines 42 are marked on the upper surface 40a according to the overall length of the hollow fiber membrane bundle 11 in a state where the hollow fiber membrane bundle 11 is not relaxed and the length considering the formation of the relaxation.

  Next, as shown in FIGS. 5A and 5B, the second members 22 and 22 are set so that the hollow fiber membrane bundle 11 is sandwiched between the first members 21 and 21, and the bolts of the base material 23 are set. The hollow fiber membrane bundle 11 is held by fastening the insertion hole 23b, the bolt insertion hole 24a of the spacer 24, and the bolt insertion hole 22b of the second member 22 with a bolt 26. In the illustrated example, the spacers 24 are provided at a total of four locations on the first member 21, and are fastened with bolts 26 at each of these four locations.

  The gripping position of the hollow fiber membrane bundle 11 at this time may be a position slightly closer to the center in the vicinity of both end portions 11A in the length direction of the hollow fiber membrane bundle 11 as shown in the drawing. Further, in the grasping step, the hollow fiber membrane bundle 11 is grasped without forming or imparting relaxation and without imparting too much tension. In the gripping step, it is preferable to take care that the spacer 24 does not contact the hollow fiber membrane bundle 11.

  Thereafter, in the gripping step, one of the pair of relaxation forming jigs 20 and 20 is provided on the relaxation forming jig 22 on the right side in the width direction in the drawing in the example shown in FIGS. At least one of the connected portion 23A or the connected portion 22A is fixed to the pair of support columns 17 and 17 using a vise or the like.

  In the gripping process of the present embodiment, the thickness of the hollow fiber membrane bundle 11 at the position gripped by the relaxation forming jig 20 is not particularly limited, but without damaging the hollow fiber membrane bundle 11 and From the standpoint of gripping reliably, it may be adjusted to be approximately 15 mm.

The weight of the hollow fiber membrane bundle per gripping area of the flat hollow fiber membrane module 1 by the gripping portions of the pair of relaxation forming jigs 20, 20, that is, the elastic member 25 is preferably 50 g / cm ² or less. 50 g / cm ² is more preferable. If the weight of the hollow fiber membrane bundle per gripping area of the flat hollow fiber membrane module 1 is not more than the above, the hollow fiber membrane bundle can be securely gripped without being damaged.

(2) Relaxation process Next, in the relaxation process, either one of the pair of relaxation forming jigs 20 and 20 that grips the vicinity of both ends 11A of the hollow fiber membrane bundle 11 in the above-described gripping process is moved to move away. By narrowing, a relaxation is formed and imparted to the hollow fiber membrane bundle 11.

Specifically, in the example shown in FIGS. 6A and 6B, one of the pair of relaxation forming jigs 20 and 20, the relaxation forming jig 20 disposed on the right side in the width direction in FIG. In the gap 41 of the bottom raising jig 40, the gap is slightly moved in the direction along the length direction of the hollow fiber membrane bundle 11 (see the arrow R shown in FIG. 6B) to narrow the separation distance. Thereby, a slight slack (relaxation) is formed and imparted to the hollow fiber membrane bundle 11.
Thereafter, in the relaxation step, the connecting portion 23A provided on the other of the pair of relaxation forming jigs 20, 20, that is, the relaxation forming jig 20 on the left side in the width direction in FIGS. 6 (a) and 6 (b). Alternatively, at least one of the connecting portions 22A is fixed to the pair of support pillars 17 and 17 using a vise or the like.

  In the present embodiment, also in the relaxation step, the distance between the pair of relaxation forming jigs 20 and 20 can be determined as appropriate based on the positioning line 42 previously marked on the upper surface 40a of the bottom raising jig 40.

(3) Insertion step Next, in the insertion step, the end portions 11A and 11A of the hollow fiber membrane bundle 11 to which relaxation is imparted in the relaxation step are inserted from the insertion ports 12a and 12a of the housings 12 and 12 provided as a pair. , Insert each.

  Specifically, as shown in FIGS. 7A and 7B, each end portion 11A of the hollow fiber membrane bundle 11 is inserted to a predetermined position from the insertion port 12a of each housing 12. Further, in the example described in the present embodiment, the end portions 17a and 17a of the pair of support columns 17 and 17 are also respectively connected to predetermined positions from the insertion ports 12a and 12a of the housings 12 and 12 provided as a pair. insert. At this time, the end portions 17a of the respective columns 17 can be joined to predetermined positions in the housing 12 by using an adhesive or screws, or can be joined by fitting.

  Here, if necessary, a tubular column is adopted for the support column 17 and, when communicating with the water collecting channel 15 in the housing 12, the column 17 is connected and fixed to the mounting portion 15a of the water collecting channel 15 (FIG. 1). (See (c)). The column 17 and the attachment portion 15a are connected and fixed by a method such as adhesion or screwing, fitting (a liquid-tight seal that does not leak the fixing resin 2) as described above. Moreover, it is preferable from a viewpoint that mechanical strength improves that the connection part of the support | pillar 17 and the attaching part 15a is embed | buried in the resin 2 for fixing in the below-mentioned fixing process. In this case, for example, an uneven shape such as a screw shape or a grain shape is formed on at least a part of the surface of the portion embedded in the fixing resin 2 in the support column 17 from the viewpoint of improving the adhesive strength. preferable. Further, it is most preferable that the portion embedded in the fixing resin 2 in the support column 17 is subjected to surface treatment such as blasting, frame treatment, or plasma treatment from the viewpoint of further improving the adhesive strength.

  In order to improve workability when the hollow fiber membrane bundle 11 in which a large number of hollow fiber membranes are bundled is inserted into the insertion port 12a of the housing 12, for example, a vinyl sheet or the like is used as the hollow fiber membrane bundle 11 and the housing 12. You may perform an insertion process in the state interposed between. And this vinyl sheet should just be removed after an insertion process is complete | finished.

  In the present embodiment, an example in which the insertion process is performed after the relaxation process is described, but the present invention is not limited thereto, and the insertion process can be performed before the relaxation process. However, it is preferable that the insertion step is performed after the relaxation step from the viewpoint that the hollow fiber membrane bundle 11 is unlikely to be displaced and it is not necessary to move the hollow fiber membrane bundle 11 within the housing 12 during the formation of the relaxation.

(4) Fixing step Next, in the fixing step, the fixing resin 2 is injected into the housing 12 in which the end portion 11A of the hollow fiber membrane bundle 11 is inserted in the insertion step, and cured to cure the hollow fiber membrane bundle 11. The end portion 11A is fixed, and the end portions 17a of the pair of support columns 17 and 17 are fixed to the housing 12 (see FIGS. 1A to 1C). In the example described in the present embodiment, the end portions 17 a of the pair of support columns 17 and 17 inserted into the housing 12 in the insertion step are also fixed with the fixing resin 2 in the same manner as the hollow fiber membrane bundle 11.

  Specifically, a holding spacer (not shown) made of a water-soluble resin or the like is first installed on the bottom 13 in the housing 12. This holding spacer is arranged for communicating the inside of the hollow fiber membrane 11, the water collecting channel 15 and the water collecting port 16 after the fixing resin 2 is cured, and is water-soluble, that is, an aqueous solvent (for example, Water, ethanol, isopropanol, and a mixed solvent thereof) and the like. Moreover, what is necessary is just to use what was shape | molded according to the magnitude | size of the water collection flow path 15 as a holding | maintenance spacer. It is preferable from the viewpoint of easy removal.

  Examples of the water-soluble resin as described above include water-soluble polymers. Specifically, plant-based polysaccharides such as guar gum, locust bean gum, quinseed gum, carrageenan, pectin, mannan, starch, and agar. ; Microbial polysaccharides such as xanthan gum, succinoglycan, curdlan, hyaluronic acid, dextran; plant proteins such as gelatin, casein, albumin, collagen; methylcellulose, ethylcellulose, hydroxycellulose, hydroxypropylcellulose, carboxymethylcellulose, cationization Cellulose type such as cellulose and hydrophobized cellulose; Starch type such as solubilized starch and carboxymethyl starch; Alginic acid type such as propylene glycol alginate; Other polysaccharide derivatives; Inorganic materials such as polyvinyl alcohol (PVA), polyvinyl pyrrolidone, carboxyvinyl polymer (polyacrylic acid), vinyl based such as polyacrylamide and derivatives thereof; ether based such as polyethylene glycol, polyethylene oxide-polypropylene oxide block copolymer; and These combinations and the like can be mentioned.

  Next, the intermediate product composed of the housing 12, the hollow fiber membrane bundle 11 and the support column 17 is leaned against a frame (not shown) in an upright posture in which the housing 12 is arranged vertically. Here, in the manufacturing method of the present embodiment, the housing 12 and the support column 17 are fixed with a predetermined joining force by performing the insertion step before the fixing step, so the housing 12 assembled in the insertion step. When the intermediate product composed of the hollow fiber membrane bundle 11 and the support column 17 is placed in the upright posture, it is possible to suppress the occurrence of misalignment or the like.

  Next, the uncured fixing resin 2 is filled into a holding spacer (not shown) from the insertion port 12 a and spread between the outer surface of the hollow fiber membrane bundle 11 and the inner surface of the housing 12. As a filling method of the fixing resin 2 at this time, for example, in addition to a method using a centrifugal force, the fixing resin 2 is sufficiently distributed between a plurality of hollow fiber membranes constituting the hollow fiber membrane bundle 11. A method of opening the hollow fiber membrane bundle 11 by blowing air or the like onto the hollow fiber membrane bundle 11 is preferably used in combination.

Next, the fixing resin 2 is heated and cured, and the end portion 11A of the hollow fiber membrane bundle 11 and the end portion 17a of the support column 17 are fixed in the housing 12 (the cross-sectional views of FIGS. 1B and 1C). reference).
Thereafter, for example, the aqueous solvent is poured into a cylindrical holding spacer to dissolve the holding spacer, and then the aqueous solvent is removed, thereby allowing the inside of the hollow fiber membrane and the water collecting flow path 15 to communicate with each other.

  In the fixing step, the intermediate product composed of the housing 12, the hollow fiber membrane bundle 11 and the support column 17 is turned upside down and the other housing 12 is placed below, and then the fixing resin 2 is also filled in the housing 12. Then, after curing, the same treatment as described above for removing the holding spacer is performed.

  In the fixing step of the present embodiment, after the fixing resin 2 is cured, as an example of a method for connecting the inside of the hollow fiber membrane 11, the water collection channel 15 and the water collection port 16, an example using the above holding spacer is used. Although described, the present invention is not limited to this, and for example, a means using an inner wall member as described in JP 2010-247023 A can be employed.

(5) Removal Step Next, in the removal step, the pair of relaxation forming jigs 20 and 20 are removed from the completed flat hollow fiber membrane module 1.
Specifically, although the detailed illustration is omitted, the pair of relaxation forming jigs 20 and 20 are removed from the hollow fiber membrane bundle 11 and the pair of support columns 17 and 17 so that a flat surface as shown in FIG. A mold hollow fiber membrane module 1 is obtained.

(Function and effect)
As explained above, according to the first embodiment of the method for producing a flat hollow fiber membrane module according to the present invention, the hollow fiber in which the pair of support columns 17 and 17 are arranged on both sides in the arrangement direction of the hollow fiber membranes. A relaxation forming step for imparting relaxation to the membrane bundle 11, an insertion step for inserting at least the end portion 11A of the hollow fiber membrane bundle 11 into the housing 12, and the fixing resin 2 is injected into the housing 12 and cured. By adopting a method including a fixing step of fixing the end portion 11A of the hollow fiber membrane bundle 11 and fixing the end portions 17a of the pair of support columns 17 and 17 to the housing 12, the hollow fiber membrane bundle 11, The housing 12 and the support column 17 can be used for the fixing process while being held in the same relative positional relationship as the finished product. Thereby, the process of injecting and hardening the fixing resin 2 can be reduced to only one while giving a slack to the hollow fiber membrane bundle 11 by a simple method. Therefore, it becomes possible to manufacture the flat hollow fiber membrane module 1 having excellent handling properties with excellent production efficiency.

  In the present embodiment, the flat hollow fiber membrane module 1 is illustrated as having a housing 12 connected to both ends of a sheet-like hollow fiber membrane bundle 11. The housing 12 may be connected to only one end of the membrane bundle 11 and the other end may be closed.

[Second Embodiment]
A second embodiment of the method for producing a flat hollow fiber membrane module according to the present invention will be described with reference to the drawings as appropriate. In the present embodiment, configurations common to the first embodiment described above are described using the same reference numerals, and are described using the same drawings, and detailed descriptions thereof are omitted.

The manufacturing method of the flat hollow fiber membrane module of this embodiment is a method of manufacturing the flat hollow fiber membrane module 1 as illustrated in FIGS. 1A to 1C, as in the first embodiment. .
And the manufacturing method of this embodiment is a method including each process shown to the following (1)-(7) at least.
(1) A gripping step in which the pair of relaxation forming jigs 20 and 20 are arranged apart from each other in the length direction of the hollow fiber membrane bundle 11 and the hollow fiber membrane bundle 11 is gripped by the pair of relaxation forming jigs 20 and 20.
(2) A relaxation step of imparting relaxation to the hollow fiber membrane bundle 11 by narrowing the distance between the pair of relaxation forming jigs 20 and 20.
(3) An insertion step of inserting the end portion 11A of the hollow fiber membrane bundle 11 into the insertion port 12a of the housing 12.
(4) A holding step of assembling the housing 12, the hollow fiber membrane bundle 11, and the pair of struts 17 and 17 into the frame of the holding frame 30 that is substantially rectangular in plan view.
(5) A connecting step of connecting and fixing the pair of relaxation forming jigs 20, 20 to the holding frame 30.
(6) The fixing resin 2 is injected into the housing 12 and cured to fix the end portion 11A of the hollow fiber membrane bundle 11, and the end portions 17a of the pair of support columns 17 and 17 are fixed to the housing 12. Process.
(7) A removal step of removing the holding frame 30 and the pair of relaxation forming jigs 20 and 20.

  That is, in the manufacturing method of the present embodiment, a holding step and a connecting step using the holding frame body 30 are added, and further, a procedure for removing the relaxation forming jig 20 and the housing 12 from the holding frame body 30 in the removing step. It is different from the manufacturing method of the first embodiment in that it is added.

(1) Grasping step In the grasping step, a pair of relaxation forming jigs 20 and 20 are arranged apart from each other in the length direction of the hollow fiber membrane bundle 11 by the same method as in the first embodiment, and the hollow fiber membrane The bundle 11 is gripped by a pair of relaxation forming jigs 20, 20.
Also in the present embodiment, like the first embodiment, prior to the gripping process, first, a bottom raising jig 40 as shown in FIGS. 2A and 2B is placed on the work table.

And as shown to Fig.3 (a), (b), the 1st members 21 and 21 which comprise a pair of relaxation | loosening formation jig | tool 20 and 20 are set apart in the clearance gap part 41 of two places.
Next, as shown in FIGS. 4 (a) and 4 (b), a hollow is formed at a predetermined position on the bottom raising jig 40 and the first member 21 based on the positioning line 42 previously marked on the upper surface 40 a of the bottom raising jig 40. While setting the thread membrane bundle 11, a pair of support | pillars 17 and 17 are set.
Next, as in the gripping step in the first embodiment, as shown in FIGS. 5A and 5B, the second member 22 so as to sandwich the hollow fiber membrane bundle 11 between the first members 21 and 21. , 22 are set and the hollow fiber membrane bundle 11 is gripped.
Thereafter, as in the first embodiment, at least one of the connecting portion 23A and the connecting portion 22A provided on the relaxation forming jig 22 on the right side in the width direction in FIGS. Secure to 17, 17 using a vise.

(2) Relaxation step Next, also in the relaxation step, relaxation is imparted to the hollow fiber membrane bundle 11 by narrowing the distance between the pair of relaxation forming jigs 20 and 20 in the same manner as in the first embodiment. To do.
That is, as shown in FIGS. 6A and 6B, based on the positioning line 42 on the bottom raising jig 40, either one or both of the pair of relaxation forming jigs 20 and 20 is attached to the hollow fiber membrane. Relaxation is formed and imparted to the hollow fiber membrane bundle 11 by moving in the direction along the length direction of the bundle 11 to narrow the separation distance.
Thereafter, as in the first embodiment, at least one of the connecting portion 23A and the connecting portion 22A provided on the relaxation forming jig 20 on the left side in the width direction in FIGS. Secure to 17, 17 using a vise.

(3) Insertion step Next, also in the insertion step, a pair of ends 11A and 11A of the hollow fiber membrane bundle 11 to which relaxation was imparted in the relaxation step was provided in the same manner as in the first embodiment. It inserts from the insertion ports 12a and 12a of the housings 12 and 12, respectively.
That is, as shown in FIGS. 7A and 7B, the end portions 11A of the hollow fiber membrane bundle 11 are inserted from the insertion ports 12a of the housings 12 to a predetermined position. Also in the present embodiment, the end portions 17a and 17a of the pair of support columns 17 and 17 are inserted from the insertion ports 12a and 12a of the housings 12 and 12 provided in a pair to a predetermined position, and an adhesive is used. They are joined using screws or joined by fitting. Further, as in the first embodiment, if necessary, a column-shaped support column 17 may be adopted, and this column 17 may be connected and fixed to the mounting portion 15a of the water collecting channel 15 (FIG. 1 (c). )).

  In the present embodiment, as in the first embodiment, the insertion step can be performed before the relaxation step. However, from the viewpoint of preventing the displacement of the hollow fiber membrane bundle 11, the insertion step Is preferably performed after the relaxation step.

(4) Holding Step Next, in the holding step, the housing 12, the hollow fiber membrane bundle 11, and the pair of support columns 17 and 17 are assembled in the frame of the holding frame body 30 that has a substantially rectangular shape in plan view.
Here, the holding frame 30 used in the present embodiment is composed of an upper angle 31, a lower angle 32, and a pair of holding posts 33, 33 as shown in the examples shown in FIGS. 8 (a) and 8 (b). In addition, the frame body has a substantially rectangular shape in plan view. Further, in the example shown in FIGS. 8A and 8B, after the housing 12, the hollow fiber membrane bundle 11 and the pair of support columns 17 and 17 maintained in a substantially horizontal state are assembled in the frame of the holding frame 30. This shows a state in which this is an upright posture.

In the holding step, first, the holding frame 30 is set horizontally at a predetermined location, and then the housing 12, the hollow fiber membrane bundle 11 and the pair of support columns 17 and 17 maintained in a substantially horizontal state are held in the holding frame 30. Housed in a frame. At this time, for example, the pair of housings 12 and 12 can be fixed to the upper angle 31 and the lower angle 32 of the holding frame 30 so as to be press-fitted, respectively.
Thus, by adopting the method using the holding frame 30, the housing 12 and the column 17 before being fixed with the fixing resin 2 in the fixing step described later are shown in FIGS. 8 (a) and 8 (b). Even when the posture is changed to the upright state as shown, the holding frame 30 securely holds the posture.

(5) Connecting Step Next, in the connecting step, the pair of relaxation forming jigs 20, 20 are connected and fixed to the holding frame 30.
Specifically, although detailed illustration is omitted, for example, bolt insertion holes are provided in the holding posts 33 and 33 of the holding frame 30 as shown in FIGS. At least one of the first member 21 or the second member 22 that constitutes is connected and fixed using a bolt. At this time, in a state where predetermined relaxation is imparted to the hollow fiber membrane bundle 11, a connecting portion including a bolt insertion hole (not shown) provided in the vicinity of both ends of the relaxation forming jig 20 is connected to the holding frame 30. The holding posts 33 and 33 are fixed to predetermined positions with bolts.

  When the bolt insertion hole provided in the holding frame 30 is a long hole, the position of the relaxation forming jig 20 can be moved along the length direction of the hollow fiber membrane bundle 11, and the hollow fiber This is preferable because the amount of relaxation of the membrane bundle 11 can be further adjusted.

(6) Fixing step Next, also in the fixing step, the fixing resin 2 is injected into the housing 12 into which the end portion 11A of the hollow fiber membrane bundle 11 is inserted and cured in the same manner as in the first embodiment. Thus, the end portion 11A of the hollow fiber membrane bundle 11 is fixed, and the end portions 17a of the pair of struts 17 and 17 are fixed to the housing 12 (see FIGS. 1A to 1C). Also in the example described in the present embodiment, the end portions 17a of the pair of support columns 17 and 17 inserted into the housing 12 are fixed by the fixing resin 2 similarly to the hollow fiber membrane bundle 11.

Specifically, as in the first embodiment, first, a spacer (not shown) made of a water-soluble resin or the like is installed on the bottom 13 in the housing 12.
Next, the holding frame 30 is rotated so that the housing 12, the hollow fiber membrane bundle 11, and the pair of struts 17 and 17 are in an upright posture.
Next, uncured fixing resin 2 is filled into a spacer (not shown) from the insertion port 12 a and spread between the outer surface of the hollow fiber membrane bundle 11 and the inner surface of the housing 12.
Next, the fixing resin 2 is heated and cured, and the end portion 11 </ b> A of the hollow fiber membrane bundle 11 and the end portion 17 a of the support column 17 are fixed in the housing 12.
Thereafter, as in the first embodiment, the aqueous solvent is poured into the cylindrical spacer to dissolve the spacer, and then the aqueous solvent is removed, so that the inside of the hollow fiber membrane and the water collecting flow path 15 are communicated. .

  Further, in the fixing step, after the holding frame 30 is turned upside down and the other housing 12 is disposed below, the housing 12 is filled with the fixing resin 2 and cured, and the holding spacer is removed. Perform the process.

(7) Removal Step Next, in the removal step, the holding frame 30 and the pair of relaxation forming jigs 20 and 20 are removed from the completed flat hollow fiber membrane module 1.
Specifically, although detailed illustration is omitted, the housing 12 and the pair of relaxation forming jigs 20 and 20 are removed from the holding frame 30, and the pair of relaxation forming jigs 20 and 20 are removed from the hollow fiber membrane bundle 11 and By removing from the pair of struts 17, a flat hollow fiber membrane module 1 as shown in FIG. 1A is obtained.

(Function and effect)
As described above, according to the second embodiment of the method for producing a flat hollow fiber membrane module according to the present invention, in the relaxation forming step, the pair of struts 17 and 17 are provided on both sides in the arrangement direction of the hollow fiber membranes. After providing relaxation to the arranged hollow fiber membrane bundle 11, after the holding step of inserting at least the end portion 11A of the hollow fiber membrane bundle 11 into the housing 12 and assembling them to the holding frame 30 in the insertion step, The fixing resin 2 is injected into the housing 12 and cured to fix the end portion 11A of the hollow fiber membrane bundle 11, and the fixing step of fixing the end portions 17a of the pair of support columns 17 and 17 to the housing 12 is provided. By adopting the above-described method, the hollow fiber membrane bundle 11, the housing 12, and the support column 17 that are not sufficiently fixed are held in the same relative positional relationship as the finished product, as in the first embodiment. Fixed It can be subjected to a degree. Thereby, the process of injecting and hardening the fixing resin 2 can be reduced to only one while giving a slack to the hollow fiber membrane bundle 11 by a simple method. Therefore, it becomes possible to manufacture the flat hollow fiber membrane module 1 having excellent handling properties with excellent production efficiency.

  The manufacturing method of the flat hollow fiber membrane module of the present invention can reduce the process of injecting and curing the fixing resin only once while imparting slack to the hollow fiber membrane bundle by a simple method, and is easy to handle. Since it becomes possible to manufacture an excellent flat hollow fiber membrane module with excellent production efficiency, it is very useful when manufacturing a flat hollow fiber membrane module used for sewage treatment or the like.

DESCRIPTION OF SYMBOLS 1 ... Flat type hollow fiber membrane module, 2 ... Resin for fixation, 11 ... Hollow fiber membrane bundle, 12 ... Housing, 12a ... Insertion port, 13 ... Bottom part, 14 ... Side surface, 15 ... Water collection flow path, 16 ... Water collection part , 17 ... struts (a pair of struts), 20 ... a relaxation forming jig (a pair of relaxation forming jigs: gripping tool for producing a flat hollow fiber membrane module), 21 ... a first member, 22 ... a second member, 26 ... Bolt (clamping means), 30... Holding frame.

Claims (11)

A housing having a water collecting channel, each end of a sheet-like hollow fiber membrane bundle comprising a plurality of hollow fiber membranes is inserted into the housing from each insertion port of the housing and fixed; and A flat type in which the ends of a pair of struts arranged along the length direction of the hollow fiber membrane bundle on both sides of the hollow fiber membrane bundle in the arrangement direction of the hollow fiber membrane bundle are fixed to the housing A method for producing a hollow fiber membrane module, comprising:
A gripping step of disposing a pair of relaxation forming jigs apart in the length direction of the hollow fiber membrane bundle, and gripping the hollow fiber membrane bundle with the pair of relaxation forming jigs;
A relaxation step of imparting relaxation to the hollow fiber membrane bundle by narrowing a separation distance between the pair of relaxation forming jigs;
An insertion step of inserting an end of the hollow fiber membrane bundle into the insertion port of the housing;
A fixing step of injecting a fixing resin into the housing and curing to fix the ends of the hollow fiber membrane bundle, and fixing the ends of the pair of struts to the housing;
Removing the pair of relaxation forming jigs;
A method for producing a flat hollow fiber membrane module. A housing having a water collecting channel, each end of a sheet-like hollow fiber membrane bundle comprising a plurality of hollow fiber membranes is inserted into the housing from each insertion port of the housing and fixed; and A flat type in which the ends of a pair of struts arranged along the length direction of the hollow fiber membrane bundle on both sides of the hollow fiber membrane bundle in the arrangement direction of the hollow fiber membrane bundle are fixed to the housing A method for producing a hollow fiber membrane module, comprising:
A gripping step of disposing a pair of relaxation forming jigs apart in the length direction of the hollow fiber membrane bundle, and gripping the hollow fiber membrane bundle with the pair of relaxation forming jigs;
A relaxation step of imparting relaxation to the hollow fiber membrane bundle by narrowing a separation distance between the pair of relaxation forming jigs;
An insertion step of inserting an end of the hollow fiber membrane bundle into the insertion port of the housing;
A holding step of assembling the housing, the hollow fiber membrane bundle, and the pair of struts in a frame of a holding frame that is substantially rectangular in plan view;
A connecting step of connecting and fixing the pair of relaxation forming jigs to the holding frame;
A fixing step of injecting a fixing resin into the housing and curing to fix the ends of the hollow fiber membrane bundle, and fixing the ends of the pair of struts to the housing;
A removal step of removing the holding frame and the pair of relaxation forming jigs;
A method for producing a flat hollow fiber membrane module.   3. The flat hollow fiber membrane module according to claim 1, wherein the relaxation forming jig is provided with an elastic member having a hardness of 3 to 20 degrees at a grip portion that grips the hollow fiber membrane bundle. Manufacturing method.   The said relaxation formation jig | tool is a manufacturing method of the flat type | mold hollow fiber membrane module as described in any one of Claims 1-3 whose thickness of the said elastic member is 2 mm or more.   The ratio (L / W) between the total width W of the flat hollow fiber membrane module and the total length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in the range of 10 to 60 times. The manufacturing method of the flat type | mold hollow fiber membrane module as described in any one of Claims 1-4.   The ratio (L / W) between the total width W of the flat hollow fiber membrane module and the total length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in the range of 20 to 50 times. The manufacturing method of the flat type | mold hollow fiber membrane module as described in any one of Claims 1-4.   The production of the flat hollow fiber membrane module according to any one of claims 1 to 6, wherein an overall length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in a range of 300 to 1500 mm. Method.   The flat hollow fiber membrane module according to any one of claims 1 to 6, wherein an overall length L of the flat hollow fiber membrane module in the arrangement direction of the hollow fiber membranes is in a range of 500 to 1250 mm. Method. The hollow fiber membrane bundle weight per holding area of the flat hollow fiber membrane module by the holding portion of the relaxation forming jig is 50 g / cm ² or less, according to any one of claims 1 to 8. A method for producing the flat hollow fiber membrane module as described. The hollow fiber membrane bundle used in the method for producing a flat hollow fiber membrane module according to any one of claims 1 to 9, until the hollow fiber membrane bundle is fixed to the housing with a fixing resin. A hollow hollow fiber membrane module manufacturing gripping tool for gripping and supporting
A first member and a second member that are gripped so as to sandwich the hollow fiber membrane bundle by being close to each other;
A sandwiching means capable of bringing the first member and the second member close to each other so that a separation distance between the first member and the second member is smaller than a thickness of the hollow fiber membrane bundle; ,
A gripping tool for producing a flat hollow fiber membrane module. Housings having water collecting channels are respectively provided on both sides in the longitudinal direction of the hollow fiber membrane, and both end portions of the sheet-like hollow fiber membrane bundle made of the plurality of hollow fiber membranes are respectively inserted into the insertion ports of the housings. A pair of struts inserted along the hollow fiber membrane bundle on both sides of the hollow fiber membrane bundle in the arrangement direction of the hollow fiber membranes. Are both flat hollow fiber membrane modules each fixed to each of the housings,
Both ends of the pair of support columns are respectively inserted from the insertion ports of the housings and fixed in the housings through a fixing resin.
The hollow fiber membrane bundle is fixed in a relaxed state between each of the housings arranged on both sides in the longitudinal direction of the hollow fiber membrane,
In the cross section when the housing is cut at a position of 30 mm from the insertion port toward the water collecting flow path side in the housing, a kind of the fixing resin is interfaced between the hollow fiber membrane bundle and the housing. A flat hollow fiber membrane module that is liquid tightly filled.

Images