JP5644393B2 - Method for producing hollow fiber membrane sheet, method for producing hollow fiber membrane module - Google Patents

Description

  The present invention relates to a method for producing a hollow fiber membrane sheet used in a hollow fiber membrane module. Moreover, it is related with the manufacturing method of a hollow fiber membrane module.

Conventionally, membrane separation technology using reverse osmosis membranes, ultrafiltration membranes, and microfiltration membranes has been used for high-grade water such as desalination of seawater or brine, production of ultrapure water for semiconductor cleaning, food separation or concentration, etc. Has been applied to the manufacture of. However, recently, from the viewpoint of environmental conservation, research on applying membrane separation technology to wastewater treatment is underway.
As a membrane used for membrane separation, a hollow fiber membrane module using a hollow fiber membrane is known. The hollow fiber membrane module is generally made of a bundle of hollow fiber membranes, cut into a predetermined length and stored in a container, and the end of the hollow fiber membrane bundle is fixed to the container with a potting resin or the like. It is manufactured by. In the production of the hollow fiber membrane module, in order to prevent the potting resin from entering the hollow fiber membrane, the hollow fiber membrane bundle end is temporarily fixed to the container in a state of being temporarily sealed with resin or the like, and then fixed after fixing. A method of opening the hollow fiber membrane at the end of the hollow fiber membrane bundle by cutting the portion is employed. As a method for temporary sealing, a method in which the vicinity of the end portions of each hollow fiber membrane is heat-sealed is known (Patent Document 1).

By the way, in a hollow fiber membrane module, when it immerses in the tank which performs membrane separation, in order to make the volume ratio in a tank high, it may make it rectangular shape. In order to produce a rectangular hollow fiber membrane module, it is necessary to produce a hollow fiber membrane sheet in which hollow fiber membranes are arranged in a sheet form.
As a method for producing a hollow fiber membrane sheet, Patent Document 2 discloses a method in which at least both ends of a hollow fiber membrane are woven into a chain braid so as to be orthogonal to the hollow fiber membrane.
In Patent Document 3, hollow fiber membranes are arranged in parallel, and a sheet is formed by fixing a part of the longitudinal direction of the hollow fiber membranes with an adhesive tape so as to be substantially orthogonal thereto, and wound around a core tube. A method is disclosed in which the fixing part is crimped to close the hollow part of the hollow fiber membrane of the fixing part, and then the substantially central part of the closing part is cut.
In Patent Document 4, the hollow fiber membranes are wound in a parallel state on a cocoon frame, the hollow fiber membranes are heat-sealed in a direction perpendicular to the longitudinal direction of the hollow fiber membranes, and cut at the heat-sealed portion. A method is disclosed.

JP-A-52-118035 JP 60-28806 A JP-A-6-31143 JP 2004-216276 A

However, in the method described in Patent Document 1, it is difficult to produce a continuous hollow fiber membrane sheet.
In the method described in Patent Document 2, since the hollow fiber membrane is processed into a woven fabric, there is a problem in that it takes time and is easily damaged at the folded portion of the hollow fiber membrane that becomes the weft.
In the method described in Patent Document 3, it is difficult to obtain a hollow fiber membrane module having a high degree of integration of the hollow fiber membranes because the volume of the fixing part is increased by fixing the hollow fiber membranes using an adhesive tape. there were.
In the method described in Patent Document 4, the fusion between the hollow fiber membranes may be incomplete.
The present invention provides a hollow fiber membrane sheet that can reliably fuse hollow fiber membranes while preventing damage to the hollow fiber membranes, and can easily produce a continuous sheet of hollow fiber membrane sheets having a high degree of integration of the hollow fiber membranes. An object is to provide a manufacturing method. Moreover, it aims at providing the manufacturing method of the hollow fiber membrane module which can manufacture a hollow fiber membrane module with a high integration degree of a hollow fiber membrane easily.

The present invention has the following aspects.
[1] An alignment process in which a large number of hollow fiber membranes are aligned in parallel to form a sheet of hollow fiber membranes, and the longitudinal direction of each hollow fiber membrane is added to the sheet of hollow fiber membranes. A notch step for forming two or more notches substantially perpendicular to the notch at a predetermined interval, and a melt for melting adjacent hollow fiber membranes by crushing the periphery of the notches of each hollow fiber membrane. A hollow fiber membrane sheet manufacturing method, comprising:
[2] The method for producing a hollow fiber membrane sheet according to [1], wherein in the cutting step, cuts are alternately formed on one surface and the other surface of the hollow fiber membrane sheet.
[3] The hollow according to [1] or [2], wherein in the cutting step, a depth of cutting into the hollow fiber membrane is set to 1/5 or more and 4/5 or less of an outer diameter of the hollow fiber membrane. A method for producing a yarn membrane sheet.
[4] In any one of [1] to [3], in the fusion step, the melt is formed by crushing the periphery of the cuts of each hollow fiber membrane while being melted. The manufacturing method of the hollow fiber membrane sheet of description.
[5] The fusion process is characterized in that fusion is performed such that the thickness of the portion fused by crushing the notch is the smallest and is 1/50 or more and 1/5 or less of the outer diameter of the hollow fiber membrane. The method for producing a hollow fiber membrane sheet according to any one of [1] to [4].
[6] A through-hole forming step of forming one or more through-holes along the longitudinal direction of the hollow fiber membrane in the portion where the cut is fused after the fusion step [1] to [5] The manufacturing method of the hollow fiber membrane sheet of any one of these.
[7] As a hollow fiber membrane, a hollow support made of a circular knitted or braided body of one yarn composed of multifilaments, and a porous membrane provided on the outer peripheral surface of the support The method for producing a hollow fiber membrane sheet according to any one of [1] to [6], wherein a material is used.
[8] The hollow fiber membrane sheet produced by the method for producing a hollow fiber membrane sheet according to any one of [1] to [7] is folded by folding at the notch to form a hollow fiber membrane sheet laminate. A laminate manufacturing step to be prepared, a fixing step of storing a folded portion of at least one hollow fiber membrane of the hollow fiber membrane sheet laminate in a housing and filling a potting resin inside the housing, and each hollow fiber membrane being open A hollow characterized by having a cutting step of cutting the potting resin together with the housing, and a water collecting portion attaching step of attaching a water collecting portion for collecting water passing through the hollow fiber membrane to the cut housing A method for manufacturing a yarn membrane module.

According to the method for producing a hollow fiber membrane sheet of the present invention, a continuous sheet of hollow fiber membrane sheets that can reliably melt the hollow fiber membranes while preventing damage to the hollow fiber membranes and that has a high degree of integration of the hollow fiber membranes. Can be easily manufactured.
According to the method for producing a hollow fiber membrane module of the present invention, a hollow fiber membrane module having a high degree of integration of hollow fiber membranes can be easily produced.

It is one Embodiment of the hollow fiber membrane sheet manufactured by the manufacturing method of the hollow fiber membrane sheet of this invention, (a) is a top view, (b) is a side view. It is a figure explaining the cutting process in one Embodiment of the manufacturing method of the hollow fiber membrane sheet of this invention, Comprising: (a) is a general view, (b) is an enlarged view. It is a side view which shows the hollow fiber membrane sheet-like material after the cutting process in one Embodiment of the manufacturing method of the hollow fiber membrane sheet of this invention. It is a figure explaining the melt | fusion process in one Embodiment of the manufacturing method of the hollow fiber membrane sheet of this invention. It is sectional drawing which shows one Embodiment of a hollow fiber membrane module. It is a figure which shows one Embodiment of the folded hollow fiber membrane sheet. It is a figure explaining one Embodiment of the manufacturing method of the hollow fiber membrane module of this invention. It is a figure explaining the cutting process in one Embodiment of the manufacturing method of the hollow fiber membrane sheet of this invention.

(Hollow fiber membrane sheet)
1 (a) and 1 (b) show an embodiment of a hollow fiber membrane sheet produced by the method for producing a hollow fiber membrane sheet of the present invention. This hollow fiber membrane sheet 10 has a large number of hollow fiber membranes 11, 11... Aligned so that their longitudinal directions are parallel to each other, and the adjacent hollow fiber membranes 11, 11 are spaced apart from each other by a predetermined distance. It has been fused with the fused portion 12.
In the hollow fiber membrane sheet 10, the hollow fiber membranes 11 and 11 are not constrained at portions other than the fused portion 12.

[Hollow fiber membrane]
As the hollow fiber membrane 11 constituting the hollow fiber membrane sheet 10, the fractionation level is any one of a microfiltration membrane (MF), an ultrafiltration membrane (UF), a nanofiltration membrane (NF), and the like. Also good. Moreover, if it can be used as a filtration membrane, it will not restrict | limit in particular in a hole diameter, a porosity, a film thickness, etc., It selects suitably by the target object of filtration. For the purpose of removing 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 resin used for the hollow fiber membrane 11 include fluorine resins (for example, polyvinylidene fluoride, polytetrafluoroethylene, etc.), polyolefins (for example, polyethylene, polypropylene), cellulose, polyvinyl alcohol, polysulfone, polyacrylonitrile, and the like. Is mentioned. Among these, fluorine resins are preferable because they are excellent in chemical resistance, and among the fluorine resins, vinylidene fluoride resins are more preferable 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, tritrifluoroethylene, hexafluoropropylene, and the like.
The outer diameter of the hollow fiber membrane 11 is preferably 0.1 to 10 mm, and more preferably 0.5 to 5 mm.
The hollow fiber membrane 11 includes a hollow support made of a single yarn circular knitted fabric or braid made of multifilament, and a porous membrane provided on the outer peripheral surface of the support. What has is preferable. When the support is provided, the mechanical strength can be increased, and thus membrane breakage during long-term use can be prevented.
As a method of forming a porous membrane on the outer peripheral surface of the support, the support is sent out from the center hole of the annular nozzle, and a film forming stock solution spun from the outer periphery of the annular nozzle is applied to the outer peripheral surface of the support. And a method of coagulating.

(Method for producing hollow fiber membrane sheet)
The said hollow fiber membrane sheet 10 is manufactured by the manufacturing method of the hollow fiber membrane sheet of this invention which has a drawing process, a notch | incision process, and a melt | fusion process.

[Alignment process]
The alignment step is a step of aligning a large number of hollow fiber membranes 11 so that their longitudinal directions are parallel to each other to obtain a sheet-like product of the hollow fiber membranes.
The interval between the hollow fiber membranes 11 and 11 is such that the hollow fiber membranes 11 and 11 can be bonded to each other with sufficiently high adhesive strength, so that the interval between the hollow fiber membranes 11 and 11 is a and the diameter of the hollow fiber membrane 11 is D and It is preferable that the relationship 0 ≦ a ≦ (D · π−2D) / 4 is satisfied. The said range has shown that 1/4 of the maximum length (D * pi) / 2 of the cross section of the flattened hollow fiber membrane overlaps. In such a range, the flattened hollow fiber membranes sufficiently overlap each other, so that the adhesive strength is increased.
In addition, the distance a between the hollow fiber membranes 11 and 11 is improved in handling at the time of manufacturing the hollow fiber membrane module, and the mechanical strength is prevented from being lowered. Therefore, 25% of the outer diameter of the hollow fiber membrane 11 is prevented. The following is preferable.

[Cutting process]
The cutting step is a step of forming two or more cuts substantially perpendicular to the longitudinal direction of each hollow fiber membrane 11 at predetermined intervals in each hollow fiber membrane 11 of the hollow fiber membrane sheet. Here, “substantially perpendicular” refers to a range of 90 ° ± 30 ° with respect to the longitudinal direction of the hollow fiber membrane 11.
In this embodiment, as a method of forming the cut, as shown in FIGS. 2 (a) and 2 (b), a hollow fiber membrane sheet-like material along the roller 19 while applying tension to the extent that the hollow fiber membrane is not crushed. A method of cutting 15 to a predetermined depth using the rotary blade 16 provided with a cutting blade 16a on the peripheral surface in parallel with the rotation axis direction is mentioned. When the rotary blade 16 is used, the notch interval can be adjusted by adjusting the transfer speed of the hollow fiber membrane sheet 15 and the rotational speed of the rotary blade 16.

  In the cutting process, as shown in FIG. 3, it is preferable to form the cuts 17 alternately on one surface 15a and the other surface 15b of the hollow fiber membrane sheet 15. If the cuts 17 are alternately formed on the one surface 15a and the other surface 15b of the hollow fiber membrane sheet-like material 15, the hollow fiber membrane sheet 10 is folded back when obtaining the hollow fiber membrane sheet laminate as will be described later. It becomes easy. In order to form the cuts 17 alternately on one surface 15a and the other surface 15b of the hollow fiber membrane sheet-like material 15, as shown in FIG. What is necessary is just to arrange | position the rotary blade 16 so that each of the surface 15a and the other surface 15b may be contact | connected.

The depth of the cuts 17 is preferably 1/5 or more and 4/5 or less of the outer diameter of the hollow fiber membrane 11. If the depth of the notch 17 is 1/5 or more of the outer diameter of the hollow fiber membrane, the rigidity around the notch 17 can be sufficiently lowered and can be surely fused in the fusion process. On the other hand, if the depth of the notch 17 is 4/5 or less of the outer diameter of the hollow fiber membrane, the hollow fiber membrane 11 is prevented from being carelessly cut when the notch is formed, and breakage when the hollow fiber membrane 11 is folded back. Can be prevented.
The interval between the cuts 17 in the longitudinal direction of the hollow fiber membrane 11 is appropriately selected according to the shape and size of the hollow fiber membrane module using the hollow fiber membrane sheet 10, but is within a range of 0.1 to 10 m. It is preferable that it is 0.5-5 m, and it is especially preferable that it is 1-3 m.

[Fusion process]
The fusing step is a step of fusing the hollow fiber membranes 11 and 11 adjacent to each other by melting while crushing the periphery of the notch 17 of the hollow fiber membrane 11.
As a method for fusing the hollow fiber membranes 11, 11, a fusing method using a fusing device 18 is applied as shown in FIG. The fusion includes heat fusion and ultrasonic fusion heat. As a device for heat fusion, known means such as an infrared heater, a warm air heater, temperature control air, or a heat medium can be used. However, an infrared heater and a warm air heater are preferable in that they can be easily crushed simultaneously with heating.

  The length in the longitudinal direction of the hollow fiber membrane 11 of the fused portion 12 in which the hollow fiber membranes 11 and 11 are fused together is preferably 1 to 100 mm, and more preferably 5 to 50 mm. With such a length, inappropriate deformation or breakage of the hollow fiber membrane 11 at the time of fusion is less likely to occur, the hollow fiber membranes 11 and 11 can be sufficiently bonded to each other, and the sheet shape is stably maintained. it can.

  In the fusing process, it is preferable that the fusing part 12 is fused so that the thickness thereof is the smallest and is 1/50 or more and 1/5 or less of the outer diameter of the hollow fiber membrane 11. The hollow fiber membrane sheet 10 can be easily folded back when the thickness of the fused portion 12 is the smallest and is 1/5 or less of the outer diameter of the hollow fiber membrane 11. If the thickness of the fused part 12 is 1/50 or more of the outer diameter of the hollow fiber membrane 11, the hollow fiber membrane sheet 10 can be prevented from being broken.

  In the fusing process, it is preferable that the notch 17 is opened in order to facilitate fusing. As a method of making the notch 17 open, a method in which the portion on the opposite side of the notch 17 of the hollow fiber membrane sheet 15 is brought into contact with the peripheral surface of the roller 19 (see FIG. 4), From the above, a method of pushing up the hollow fiber membrane sheet toward the notch 17 can be mentioned.

[Other processes]
After the fusion process, it is preferable to form one or more through holes in the fusion part 12 along the longitudinal direction of the hollow fiber membrane. When the through-hole is formed in the fused portion 12, in the manufacture of the hollow fiber membrane module described later, since the potting resin passes through the through-hole when filling the potting resin in the housing, the wraparound property of the potting resin is increased. The filling property of the resin in the housing can be improved.
Further, the obtained hollow fiber membrane sheet 10 may be wound around a reel or the like as necessary to form a wound body.

[Function and effect]
In general, the hollow fiber membrane 11 has high rigidity in order to prevent deformation at the time of filtration, and thus is not easily deformed against crushing. However, in the manufacturing method of the hollow fiber membrane sheet, the rigidity of the hollow fiber membrane 11 around the notch 17 is lowered by forming the notch 17. Therefore, since the periphery of the notch 17 can be easily crushed, the adjacent hollow fiber membranes 11 can be easily fused together, and the inside of the hollow fiber membrane 11 can be reliably temporarily sealed.
Moreover, in the said manufacturing method, since it is not necessary to make the sheet | seat by woven hollow fiber membrane 11, damage can be prevented. Moreover, since the hollow fiber membranes 11 are not bonded to each other using an adhesive tape or the like, the volume of the folded portion is reduced when folded, and the hollow fiber membrane sheet 10 having a high degree of integration of the hollow fiber membranes 11 is obtained. Can do. Furthermore, in this production method, the hollow fiber membrane continuous sheet can be easily produced because the continuous sheet can be cut and fused.

(Hollow fiber membrane module)
An embodiment of a hollow fiber membrane module in which the hollow fiber membrane sheet of the present invention is used will be described.
FIG. 5 shows a hollow fiber membrane module of the present embodiment. In the hollow fiber membrane module 1 of the present embodiment example, each end portion of the hollow fiber membrane sheet 10 is housed in two housings 50, and the potting resin 60 keeps the hollow fiber membrane 11 open. The housing 50 is fixed to the housing 50 and a water collecting part 70 is attached to the housing 50.

As the potting resin 60, an epoxy resin, an unsaturated polyester resin, a polyurethane resin, a silicone filler, various hot melt resins, and the like can be used.
Moreover, the viscosity of the potting resin 60 before curing is not particularly limited, but is preferably 100 to 1000 mPa · s, more preferably 200 to 800 mPa · s at 23 ° C. If the potting resin has a viscosity of 100 mPa · s or more, the potting resin 60 is difficult to enter the hollow fiber membrane 11 and therefore can be blocked. If it is 1000 mPa · s or less, it has sufficient fluidity. Can be filled easily.
In order to adjust the viscosity and the exothermic reaction temperature, inorganic fine particles can be added to the potting resin 60.

The water collection unit 70 is a member that collects water that has been suction filtered inside the hollow fiber membrane 11 and that has passed through the inside of the hollow fiber membrane. The water collection unit 70 has a lead-out pipe for leading the collected water.
Examples of the water collection unit 70 include those having a circular cross section and those having a rectangular cross section, and those that do not hinder aeration for cleaning the hollow fiber membrane 11 are selected.
The material of the water collection part 70 should just have mechanical strength and durability, for example, a polycarbonate, a polysulfone, a polypropylene, an acrylic resin, an ABS resin, a modified PPE resin, a PPS resin, a corrosion-resistant metal etc. are mentioned. It is done. Among these, those having high adhesiveness with the potting resin 60 are more preferable.

(Method for producing hollow fiber membrane module)
This hollow fiber membrane module is manufactured as follows.
That is, in the manufacture of the hollow fiber membrane module, first, the hollow fiber membrane sheet laminate 20 as shown in FIG. 6 is produced by folding the hollow fiber membrane sheet by cutting it back while supplying it from a reel or the like.
Next, as shown in FIG. 7, one folded portion 21 of the hollow fiber membrane sheet laminate 20 is placed in the housing portion 51 of the housing 50 in which a rectangular parallelepiped housing portion 51 having an elongated and substantially rectangular shape is formed. Store. Next, in a state where the hollow fiber membrane sheet laminate 20 and the housing 50 are stationary, the storage portion 51 is filled with a liquid potting resin 60 and is cured, so that one folded portion 21 of the hollow fiber membrane sheet laminate 20 is cured. To fix. Further, the other folded portion 22 in the hollow fiber membrane sheet laminate 20 is also fixed in the same manner. Next, the potting resin 60 cured together with the housing 50 is cut so that each hollow fiber membrane 11 is opened. Then, the water collection part 70 is attached to the cut | disconnected housing 50, and the hollow fiber membrane module 1 is obtained.
The hollow fiber membrane module obtained by using the hollow fiber membrane sheet 10 has a high degree of integration of the hollow fiber membranes.

In addition, this invention is not limited to the said embodiment. For example, as a method of forming the cut, the rotary blade 16 may not be used as long as the hollow fiber membrane 11 can be cut to a predetermined depth without being cut. For example, as shown in FIG. A cutting blade 116 that moves perpendicularly to the yarn film sheet 15 may be provided. The cutting blades 116 may be arranged so as to alternately form the cuts 17 on the one surface 15a and the other surface 15b of the hollow fiber membrane sheet 15.
Further, the hollow fiber membrane module may be a module in which a water collecting portion is attached only to one folded portion of the hollow fiber membrane sheet laminate.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the examples.
Example 1
On the surface of a knitted string made of polyethylene terephthalate (PET) fiber, 20 hollow hollow fiber membranes made of polyvinylidene fluoride (Mitsubishi Rayon Co., Ltd., inner diameter 1000 μm, outer diameter 2800 μm) are parallel to each other and hollow fibers. The membranes were aligned so that the distance between the membranes was 25% (700 μm) of the outer diameter of the hollow fiber membranes to obtain a hollow fiber membrane sheet.
Next, the hollow fiber membrane sheet is supplied to the first roller and the second roller, and is temporarily stopped, and a rotary round blade type rotary cutter is hollowed at the uppermost part of the first roller and the lowermost part of the second roller. The sheet was pressed against the membrane sheet, and cuts were alternately formed on one side and the other side of the hollow fiber membrane sheet. At that time, the depth of the cut was 2/3 of the outer diameter of the hollow fiber membrane. Further, the interval between the cut formed by the first roller and the cut formed by the second roller was set to 2 m.
After forming the cut, the hollow fiber membrane sheet was not moved, and the cut was opened by bringing the hollow fiber membrane into contact with the peripheral surface of the roller. Next, the periphery of the cut was melted while being crushed by using a heat fusion apparatus using a microheater, and the melted resin was swelled to fuse adjacent hollow fiber membranes. At this time, the fusion part was the thinnest and its thickness was set to 1/20 of the outer diameter of the hollow fiber membrane.
The above-mentioned cutting and fusion were performed so that each cutting and fusion part was 2 m apart to obtain a hollow fiber membrane sheet. Further, the hollow fiber membrane sheet was wound on a reel to obtain a wound body of the hollow fiber membrane sheet.
Subsequently, the hollow fiber membrane sheet was sent out from the wound body of the hollow fiber membrane sheet and folded at the fusion part to obtain a hollow fiber membrane sheet laminate in which 10 layers of 2 m hollow fiber membrane sheets were folded.
Next, one folded portion of the hollow fiber membrane sheet laminate is stored in a housing in which a rectangular parallelepiped storage portion having an elongated and substantially rectangular shape is formed so that the integration degree of the hollow fiber membrane is 65%. did. Next, with the hollow fiber membrane sheet laminate and the housing stationary, the storage part is filled with a two-component curable epoxy resin (mixed initial viscosity 600 mPa · s) and cured in about 6 hours to obtain a hollow fiber membrane. One folded portion of the sheet was fixed. The other folded portion of the hollow fiber membrane sheet laminate was also fixed in the same manner.
Next, the epoxy resin cured together with the housing was cut so that each hollow fiber membrane was opened, and a water collecting part was attached to the cut housing to obtain a hollow fiber membrane module.
In Example 1, since the hollow fiber membrane sheet was cut and cut after the rigidity was weakened, the sealing property of the hollow fiber membrane can be improved, and blockage by potting resin due to poor sealing can be prevented. It was. Further, the hollow fiber membrane sheet could be easily folded back, and when the hollow fiber membrane sheet laminate was produced, the folded portion did not swell or crack, and could be easily accommodated in the housing.

(Comparative Example 1)
The hollow fiber membrane sheet was sealed by fusion in the same manner as in Example 1 except that no cut was formed in the hollow fiber membrane. Furthermore, it cut | disconnects so that it may become a sheet | seat one sheet at the center of the melt | fusion part of this hollow fiber membrane sheet | seat, and a hollow fiber membrane sheet laminated body is obtained by stacking so that it may become 10 layers. It was. Using this hollow fiber membrane sheet laminate, a hollow fiber membrane module was produced in the same manner as in Example 1. At that time, clogging with potting resin due to poor sealing occurred about 7%, and the effective membrane area decreased. Further, in this hollow fiber membrane module, the rigidity of the hollow fiber membrane was too high, and the sealing property of the hollow fiber membrane was insufficient even when the hollow fiber membrane was crushed and fused while heating.

DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane module 10 Hollow fiber membrane sheet 11 Hollow fiber membrane 12 Fusion | bond part 15 Hollow fiber membrane sheet-like material 16 Rotary blade 17 Notch 18 Fusing instrument 19 Roller 20 Hollow fiber membrane sheet laminated body 50 Housing 51 Storage part 60 Potting Resin 70 water collecting part

Claims (8)

An alignment step of aligning a large number of hollow fiber membranes so as to be parallel to form a sheet of hollow fiber membranes,
A cutting step of forming, in the sheet-like material of the hollow fiber membrane, two or more cuts substantially perpendicular to the longitudinal direction of each hollow fiber membrane at a predetermined interval;
Fusing while crushing the periphery of the cut of each hollow fiber membrane, and fusing adjacent hollow fiber membranes;
A process for producing a hollow fiber membrane sheet, comprising:   2. The method for producing a hollow fiber membrane sheet according to claim 1, wherein in the cutting step, cuts are alternately formed on one surface and the other surface of the hollow fiber membrane sheet.   The hollow fiber membrane sheet according to claim 1 or 2, wherein, in the cutting step, the depth of the cut into the hollow fiber membrane is 1/5 or more and 4/5 or less of the outer diameter of the hollow fiber membrane. Method.   The hollow fiber membrane according to any one of claims 1 to 3, wherein in the fusing step, when the melt is performed by crushing the periphery of the cut of each hollow fiber membrane, the cut is opened. Sheet manufacturing method.   In the fusing step, fusing is performed such that the thickness of the portion fused by crushing the notch is the smallest and is 1/50 to 1/5 of the outer diameter of the hollow fiber membrane. The manufacturing method of the hollow fiber membrane sheet | seat of any one of -4.   6. The production of a hollow fiber membrane sheet according to any one of claims 1 to 5, further comprising a through-hole forming step of forming one or more through-holes in a portion where the cuts are fused after the fusing step. Method.   As the hollow fiber membrane, one having a hollow support made of a circular knitted body or braid of one yarn composed of multifilaments and a porous membrane provided on the outer peripheral surface of the support is used. The manufacturing method of the hollow fiber membrane sheet of any one of Claims 1-6 characterized by the above-mentioned. Laminate production for producing a hollow fiber membrane sheet laminate by folding the hollow fiber membrane sheet produced by the method for producing a hollow fiber membrane sheet according to any one of claims 1 to 7 by folding back at the cut. Process,
A fixing step of storing a folded portion of at least one hollow fiber membrane of the hollow fiber membrane sheet laminate in a housing and filling a potting resin inside the housing;
A cutting step of cutting the potting resin together with the housing so that each hollow fiber membrane opens,
A method for producing a hollow fiber membrane module, comprising: a water collection part attaching step for attaching a water collection part for collecting water passing through the hollow fiber membrane to a cut housing.

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