JP2009154910A - Packaging body of hollow fiber membrane filter element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact package of a soaking type hollow fiber membrane filter element in which the hollow fiber membrane filter element can be transported, handled or stored without damage. <P>SOLUTION: The package of the hollow fiber membrane filter element is obtained by enveloping the soaking type hollow fiber membrane filter element in a film (for example a gas barrier film 10 and a protective film 11), the hollow fiber membrane filter element having at least one end-fixed part where the end part of a hollow fiber membrane bundle composed of a plurality of the hollow fiber membranes is fixed with a casting agent, wherein a shock-absorbing material 9 is disposed at least at one end-fixed part to keep the film sealed with the film and at least a part of the hollow fiber membrane tightly adhering to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a package for a hollow fiber membrane filtration element. In particular, the present invention relates to a package for a submerged hollow fiber membrane filtration element used in a membrane separation activated sludge method or the like. In the present invention, the submerged hollow fiber membrane filtration element refers to a hollow fiber membrane filtration element of a type that does not have a housing and the hollow fiber membrane is exposed.

  Generally, the hollow fiber membrane filtration element includes a type in which the hollow fiber membrane is housed in a housing and a type in which the membrane is exposed without the housing. The former is used by a method of connecting to a pipe and pressurizing and filtering. On the other hand, the latter is used in a method of suctioning and filtering while immersed in the water to be filtered.

  As an application example of the latter hollow fiber membrane filtration element, there is a membrane separation activated sludge method in which a membrane filtration element is immersed in an activated sludge tank and the activated sludge is separated by filtration. In this method, the activated sludge concentration (MLSS: Mixed Liquor Suspended Solid) can be very high from 5000 to 20000 mg / l, and the filtration treatment can be performed. For this reason, it has the advantage that the volume of the activated sludge tank can be reduced or the reaction time in the activated sludge tank can be shortened. In addition, since filtration is performed with a membrane, there is no need for a final sedimentation tank for removing suspended solids (SS) from the treated water. Furthermore, since it can filter regardless of the quality of activated sludge sedimentation, it is not necessary to take special measures even when the activated sludge sedimentation is poor. As described above, the membrane separation method has many merits as compared with the precipitation method, and has been rapidly spreading in recent years.

  Usually, when the hollow fiber membrane filtration element is stored or transported, it is packaged in a film made of polyethylene or the like. At this time, the hollow fiber membrane may be in a dry state or in a wet state in which water or various aqueous solutions are enclosed as a preservation solution for preventing the hollow fiber membrane from drying, preventing freezing, and preventing bacteria. Sometimes it is.

  In hollow fiber membrane filtration elements where the hollow fiber membrane is housed in a housing, the hollow fiber membrane is covered with a strong housing, so that the hollow fiber membrane can be dried or cut during storage or transportation. It usually doesn't happen. Patent Document 1 discloses packaging with a film containing at least one of PVDC, EVOH, and nylon for the purpose of preventing the hollow fiber membrane from drying.

On the other hand, in the hollow fiber membrane filtration element of the type that does not have a housing and the membrane is exposed, that is, the immersion type hollow fiber membrane filtration element referred to in the present invention, the hollow fiber membrane swings due to vibration during transportation or handling. May be damaged, or in some cases, the membrane may be cut. Therefore, the hollow fiber membrane filtration element was put in a cylindrical container and packaged in a state in which a storage solution such as water was sealed, but there was a problem that the volume of the package increased and the weight was large. .
JP-A-6-246138

  The present invention provides a compact hollow fiber membrane filtration element package in a submerged hollow fiber membrane filtration element, in which the hollow fiber membrane is not damaged during transportation, handling or storage. An object of the present invention is to provide a hollow fiber membrane filtration element package that is compact without causing damage to the hollow fiber membrane when the membrane is wetted with a preservative solution, and that does not cause performance degradation. .

  As a result of intensive studies, the present inventors have found that the above-mentioned problems can be solved by reducing the pressure inside the packaging film and sealing the film in close contact with the hollow fiber membrane, resulting in the present invention. That is, the present invention is as follows.

(1) A package in which an immersion type hollow fiber membrane filtration element having an end fixing portion in which at least one end portion of a hollow fiber membrane bundle composed of a plurality of hollow fiber membranes is fixed with a casting agent is wrapped with at least one film. A package of a hollow fiber membrane filtration element, wherein the film is sealed in a state where the film and at least a part of the hollow fiber membrane are in close contact with each other at at least one end fixing portion.
(2) In (1), the cushioning material is disposed between at least one end fixing portion between the film and the hollow fiber membrane filtration element so as to avoid damage to the hollow fiber membrane. A package of the hollow fiber membrane filtration element described.
(3) Buffer material so that damage to the hollow fiber membrane is avoided between the end fixing portion or the end fixing portion surrounding member and the film on the outer periphery of the boundary portion between at least one end fixing portion and the hollow fiber membrane The package of hollow fiber membrane filtration elements according to (1), wherein
(4) The packaging body for a hollow fiber membrane filtration element according to (1) or (2), wherein the cushioning material is a cushioning material having an independent space inclusion structure.
(5) The package of the hollow fiber membrane filtration element according to (2) or (3), wherein the cushioning material comprises a foam sheet or a bubble sheet.
(6) The hollow fiber membrane filtration according to any one of (1) to (5), wherein there are a plurality of films surrounding the hollow fiber membrane filtration element, and at least one of the films includes a gas barrier film. Element packaging.
(7) There are a plurality of films surrounding the hollow fiber membrane filtration element, the film includes a gas barrier film and a protective film, the gas barrier film and the hollow fiber membrane are in close contact, and further the gas barrier film and the protection The package of the hollow fiber membrane filtration element according to any one of (1) to (5), wherein the film is in close contact with the film.
(8) The package of the hollow fiber membrane filtration element according to (6), wherein the gas barrier film has a thickness of 0.03 to 0.1 mm.
(9) The packaging of the hollow fiber membrane filtration element according to any one of (6) to (8), wherein the gas barrier film is a multilayer film including at least a gas barrier layer and a heat-sealing layer. body.
(10) The package of the hollow fiber membrane filtration element according to any one of (7) to (9), wherein the protective film has a thickness of 0.1 to 0.3 mm.
(11) The package of the hollow fiber membrane filtration element according to any one of (1) to (10), wherein the sealed film is in a reduced pressure state.
(12) The hollow fiber membrane filtration element is a hollow fiber membrane filtration element containing water or an aqueous solution in the pores in the hollow fiber membrane, according to any one of (1) to (11), A package of hollow fiber membrane filtration elements.
(13) The packaged body for a hollow fiber membrane filtration element according to (12), wherein the content volume of water or an aqueous solution is 0.8 to 1.5 times the volume that can be held by the hollow fiber membrane.
(14) The package of the hollow fiber membrane filtration element according to any one of (1) to (14), wherein both end fixing portions are fixed as small bundles of 10 to 300 bundles.
(15) When packaging a submerged hollow fiber membrane filtration element having an end fixing part in which at least one end part of a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes is fixed with a casting agent, the hollow fiber membrane filtration element The method according to claim 1, further comprising: a step of housing the film in a film; and a step of removing air in the film to bring the hollow fiber membrane and the film into close contact with each other and sealing the state while maintaining the state. A method for producing a hollow fiber membrane filter element packaging.
(16) When packaging a submerged hollow fiber membrane filtration element having an end fixing portion in which at least one end of a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes is fixed with a casting agent, (A) hollow fiber A step of surrounding an outer periphery of a boundary portion between at least one end fixing portion of the membrane filtration element and the hollow fiber membrane with a buffer material, (B) a step of housing the hollow fiber membrane filtration element in the gas barrier film, (C) Including a step of housing the hollow fiber membrane filtration element in a protective film, and (D) removing the air in the film to bring the hollow fiber membrane and the film into close contact with each other and sealing the state while maintaining the state. (2) The manufacturing method of the hollow fiber membrane filtration element packaging body as described in (3) characterized by these.
(17) Prior to the steps (A) to (D), the step (E) includes a step of causing the hollow fiber membrane filtration element to contain water or an aqueous solution, and the content volume of the water or aqueous solution is retained in the hollow fiber membrane. The method for producing a hollow fiber membrane filtration element package according to (16), wherein the hollow fiber membrane filtration element contains water or an aqueous solution so as to be 0.8 to 1.5 times the possible volume.

The package of the present invention does not damage the hollow fiber membrane during transportation, handling or storage in the submerged hollow fiber membrane filtration element. Furthermore, when the hollow fiber membrane is moistened with a preservation solution, the hollow fiber membrane is not damaged and the performance is not deteriorated. In addition, since the film is in close contact with the hollow fiber membrane, the entire hollow fiber membrane filtration element becomes rigid, so that handling is improved and transportation is facilitated, and the volume is reduced, so that the transportation cost is reduced.
Moreover, according to the manufacturing method of this invention, the said package can be obtained easily and reliably.

  The hollow fiber membrane filtration element constituting the package of the present invention is one in which one or both ends of a plurality of hollow fiber membranes are fixed, and at least one hollow fiber membrane end face has a hollow portion opened. ing. As a specific aspect, (A) one end water collecting system in which both ends of the hollow fiber membrane are fixed, the hollow portion at one end is open and the hollow portion at the other end is closed. Hollow fiber membrane filtration element, (B) Both ends of the hollow fiber membrane are fixed, and both ends of the hollow fiber membrane filtration element with a water collecting system in which the hollow part is open, ( C) The hollow fiber membrane is bundled in a U-shape, and both ends of the hollow fiber membrane are fixed in a state where the hollow fiber membranes are gathered together in one of the hollow fiber membrane filtration elements, and the hollow of the one-end water collection system in which the hollow part is open Examples thereof include a thread membrane filtration element.

The hollow fiber membrane filtration element is used for a filtration process such as an external pressure filtration method in a state where a part for connecting to a pipe of a filtration device and taking out raw water is connected to the opening end face.
FIG. 1 shows an example of a hollow fiber membrane filtration element used in the external pressure filtration method. The hollow fiber membrane filtration element includes a hollow fiber membrane bundle 1 composed of a plurality of hollow fiber membranes, and an upper head 2 and a lower ring 3 which are a kind of end fixing portion surrounding members at both ends of the hollow fiber membrane bundle 1. The hollow fiber membrane is fixed by the upper head side end fixing portion 4 and the lower ring side end fixing portion 5. The hollow fiber membrane on the upper head side is open at the hollow portion, and the hollow fiber membrane on the lower ring side is closed at the hollow portion. The lower ring 3 is partitioned at its center by a partition plate having a plurality of through holes 6 ′, and an end fixing portion 5 is formed at this portion. A through hole 6 is formed in the lower ring side end fixing portion 5 and communicates with a through hole 6 ′ provided in the partition plate of the lower ring. In the lower ring 3, an air reservoir 7 is provided on the side opposite to the end fixing portion 5. The upper head 2 and the lower ring 3 are connected by a column 8. Both ends of the column 8 are inserted and fixed inside the upper head side end fixing portion 4 and the lower ring side end fixing portion 5.

  As the hollow fiber membrane, a reverse osmosis membrane, an ultrafiltration membrane, a microfiltration membrane or the like can be applied. Moreover, the raw material of a hollow fiber membrane is not specifically limited, A well-known raw material can be applied to a hollow fiber membrane. For example, polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, poly-4methylpentene, cellulose, cellulose acetate, polyvinylidene fluoride, polyethylene-tetra Examples thereof include fluoroethylene copolymers, polytetrafluoroethylene, and composite materials thereof. Preferably, polyvinylidene fluoride, polysulfone, polyethersulfone, and polyacrylonitrile can be used. A film having an inner diameter of 50 μm to 3000 μm and an inner / outer diameter ratio of 0.3 to 0.8 can be suitably applied.

  The end fixing portion is fixed by a material for fixing such as a casting agent. Here, the casting agent is a resin for bonding and / or fixing the hollow fiber membranes to form a fixed part, and usually a two-component mixed curable resin or a thermoplastic resin is used. The two-component mixed curable resin is a resin that is cured by mixing a plurality of reactive compounds. Generally, the two-component adhesive (two-component adhesive), the two-component type casting agent (two- It is also referred to as “component casting resin”, and two liquids called a main agent and a curing agent are mixed and cured at the time of use.

  In the present invention, a urethane resin comprising a main agent containing isocyanate as a reactive group and a curing agent containing an active hydrogen-containing organic compound, a main agent containing an epoxy group as a reactive group, an active hydrogen-containing organic compound or an organic acid. An epoxy resin composed of a curing agent containing an anhydride, a silicon resin composed of a vinyl group-containing polysiloxane and a hydrosilyl group-containing polysiloxane, and the like are preferably used. The thermoplastic resin is preferably a resin whose melting point is lower than that of the polymer constituting the hollow fiber membrane and that is physically and chemically stable to the raw water to be filtered. Specific examples include thermoplastic resins such as polyurethane, polyester, polyethylene, and polypropylene, and waxes.

  In the hollow fiber membrane filtration element, the outer diameter of the hollow fiber membrane bundle in the at least one hollow fiber membrane end fixing portion is usually larger than the outer diameter of the hollow fiber membrane bundle in the central portion in the length direction. When such a hollow fiber membrane filtration element is wrapped with a film and then the pressure is reduced and the film is brought into close contact with the hollow fiber membrane, the hollow fiber membrane near the outer periphery of the bundle is pressed against the bundle center at the boundary of the end fixing portion. Therefore, the hollow fiber membrane near the outer periphery is easily damaged. In particular, when the hollow fiber membranes are densely formed in a small bundle at the end fixing portion, the hollow fiber membranes are dispersed one by one although the film is less likely to be cut even if they are brought into close contact with each other. In the case of a state, the tendency to cut | disconnect becomes strong. In addition, the boundary part of an edge part fixing part said in this specification means the area | region including a boundary part and its vicinity part.

  In the package of the present invention, it is preferable to dispose a cushioning material so as to avoid the damage of the hollow fiber membrane at the boundary portion of the end fixing portion. As the arrangement of the cushioning material, a mode in which the buffer is disposed at the outer periphery of the boundary part between the end fixing part and the hollow fiber membrane or the boundary part between the end fixing part surrounding member and the hollow fiber membrane, A mode in which the cushioning material is inserted into the hollow fiber membrane bundle on the center side from the boundary part of the end fixing part can be adopted. In particular, it is most preferable that the outer periphery of the boundary portion between the end fixing portion and the hollow fiber membrane or the boundary portion between the end fixing portion surrounding member and the hollow fiber membrane is surrounded by a cushioning material. That is, when the hollow fiber membrane end fixing portion is configured without using the end fixing portion surrounding member, the boundary portion between the end fixing portion and the hollow fiber membrane at the boundary portion of the end fixing portion. Is surrounded by cushioning material. Further, when the hollow fiber membrane end fixing portion is configured using an end fixing portion surrounding member, an end fixing portion surrounding member is provided at the outer periphery of the boundary portion between the end fixing portion and the hollow fiber membrane. The hollow fiber membrane bundle is surrounded by a buffer material. Hereinafter, a boundary portion between the end fixing portion and the hollow fiber membrane may be referred to as a boundary surface of the end fixing portion.

  The region of the boundary portion of the end fixing portion surrounded by the buffer material is at least in the range of +10 mm to −10 mm from the boundary surface to the center of the filtration element. The entire length of the hollow fiber membrane bundle and the range of the entire end fixing portion may be enclosed, and the range of +50 mm to −50 mm is preferable, and the range of +300 mm to the entire end fixing portion is the certainty of protection by the cushioning material. This is particularly preferable from the viewpoint of economy. By enclosing this range with a cushioning material, it is possible to more effectively prevent the hollow fiber membrane from being damaged or cut when it is wrapped with the film and then the pressure is reduced to bring the film into close contact with the hollow fiber membrane.

  The cushioning material has a function of absorbing a force applied from the outside due to vibrations generated during transportation and handling. This can prevent the hollow fiber membrane from being damaged by the force applied from the outside. In addition, when the outer periphery of the end fixing portion or the end fixing portion surrounding member is surrounded by the cushioning material, the edge portion of the end fixing portion or the end fixing portion surrounding member and the film are rubbed to damage the film. Can be prevented.

  The cushioning material is preferably a flexible and lightweight porous material, and preferably has a sponge-like continuous pore structure or an independent space inclusion structure. Especially, what has an independent space inclusion structure is especially preferable. The independent space inclusion structure is a three-dimensional structure composed of a solid part and a space, and has a space inside the structure formed by the solid part. The space is sealed and does not communicate with the outside space. The space may be divided into a plurality of spaces. The space is filled with gas and / or liquid. Since the cushioning material has an independent space inclusion structure, even when the inside of the packaging film is depressurized, the cushioning material does not reduce its volume and does not lose its flexibility and lose its cushioning function. On the other hand, in the shock absorbing material having a continuous pore structure in which the internal space and the external space communicate with each other like a sponge structure, the volume is reduced in a decompressed state, the flexibility is lost and the buffer function is lost. There is a case.

  The cushioning material with a closed-space inclusion structure is a so-called closed-cell foam that is molded by foaming into closed cells, a so-called bubble sheet that is sealed in a state where air is contained in many compartments, and air is enclosed in a tube Balloons and the like. Specific examples include a foamed polyethylene sheet, a bubble sheet, and a rubber tube in which air is sealed as a packing material. Moreover, what shape | molded the foam and the expandable bead with the metal mold | die etc. is used suitably.

  The shape of the cushioning material is not particularly limited, but is preferably a shape that can be adapted to the external shape of the end fixing portion. Such a shape is particularly preferably a sheet having a thickness of 0.5 to 5 mm. In addition, it is particularly suitable to mold in advance according to the external shape of the end fixing portion with a mold or the like.

  Although the material which comprises this buffer material is not specifically limited, It is preferable that it is a comparatively flexible material. For example, a thermoplastic resin or rubber having a tensile elastic modulus of 2,500 MPa or less is preferably used. When comprised with such a material, there is no fear of damaging when contacting with a hollow fiber membrane or film.

  The package of the hollow fiber membrane filtration element of the present invention is wrapped with a film, and the film needs to be sealed in close contact with the hollow fiber membrane. The close contact state means that the hollow fiber membrane present on the outermost periphery of the bundle of hollow fiber membranes in a region of 50% or more in the length direction of the hollow fiber membrane is a film or a buffer material on at least a part of the outer surface of the hollow fiber membrane It means a state of contact and restraint. In such a state, the entire hollow fiber membrane cannot be swung within the film even if vibration is applied from the outside. By adopting such a state, it is possible to prevent the hollow fiber membrane from being swung and damaged by vibrations or the like generated during transportation or handling.

  The buffer material is preferably in close contact with the film. In such a state, since the buffer material is fixed, it is possible to prevent the position of the buffer material from being moved due to vibration during transportation or handling and the like to impair the effect. The close contact state can be realized and maintained by removing air in the film and sealing in that state as described later.

  In addition, when the hollow fiber membrane is in a wet state, if a temperature change repeatedly occurs during storage, the liquid in the pores evaporates and condenses in the film. As a result, the liquid in the pores Loss may cause problems such as performance degradation. On the other hand, when the film and the hollow fiber membrane are brought into close contact with each other, the space in the package can be reduced and the amount of evaporation can be reduced to prevent the above problem from occurring.

A plurality of the above films are preferably used, and at least one film is preferably a gas barrier film. A gas barrier film is a film having low permeability to air or water vapor, but water vapor permeability can be used as a representative index. As the gas barrier film in the package of the present invention, a film having a moisture permeability measured by the method of ASTM-F1249 (38 ° C., 90% RH) of 10 g / m ² · day or less is preferably used. Suitable examples of such films include polyvinylidene chloride films, ethylene-vinyl alcohol copolymer films, and aluminum vapor deposited films. In particular, the gas barrier film is particularly preferably a multilayer film including at least a gas barrier layer and a heat-sealing layer.

  The gas barrier film preferably has a thickness of 0.03 to 0.1 mm. The film having such a thickness is flexible and easily adheres along the shape of the hollow fiber membrane filtration element when the pressure is reduced. That is, if it is 0.03 mm or more, it is strong and difficult to break, and if it is 0.1 mm or less, it is flexible and easily adheres along the shape of the hollow fiber membrane filtration element.

It is preferable to use a protective film in addition to the gas barrier film.
The protective film has a function of preventing breakage of the gas barrier film and / or damage of the hollow fiber membrane surface. Specifically, a low density polyethylene film, a multilayer film having a low density polyethylene layer on the surface, a polyester film, and the like are preferable examples. Among these, a polyethylene film and a multilayer film having a low density polyethylene layer on the surface are particularly preferable because they can be easily heat-sealed and sealed. The protective film can be disposed outside the gas barrier film for the purpose of protecting the gas barrier film from external impacts and the like. Moreover, it can also arrange | position inside a gas barrier film for the purpose of preventing that a gas barrier film damages with the edge of the structural member of a hollow fiber membrane filtration element, etc.

  The protective film preferably has a thickness of 0.1 to 0.3 mm. Since the strength is 0.1 mm or more, the protective effect can be maintained. Moreover, since it will be flexible if it is 0.3 mm or less, it will become easy to adhere | attach on the gas barrier film or the hollow fiber membrane surface. In addition, a multilayer film having the functions of a gas barrier film and a protective film can also be used for the packaging of the present invention, but when compared with the case where the total thickness of the film is the same, a plurality of gas barrier films and protective films can be used. It is more preferable to use a film because the hollow fiber membrane and the film are easily adhered to each other.

When the gas barrier film and the protective film are used as separate bodies, the barrier film can be prevented from being damaged by the protective film, so that the following effects are obtained.
(1) The membrane performance can be reliably maintained.
(2) A gas barrier film having a small thickness can be used. Since the gas barrier film having a small thickness has high flexibility, the adhesion to the hollow fiber membrane bundle is good. That is, by keeping the protective film separate from the gas barrier film, it is possible to simultaneously realize the good film adhesion and the gas barrier function.
When using a plurality of films, it is necessary that at least the innermost film is in close contact with the hollow fiber membrane and the buffer material as described above. Further, it is particularly preferable that the respective films are in close contact with each other because the package becomes more rigid and the handling property is remarkably improved.

  The hollow fiber membrane of the hollow fiber membrane filtration element may be in a dry state, or may be in a state where the pores of the hollow fiber membrane are filled with a liquid (hereinafter abbreviated as a wet state). It is preferable that the hollow fiber membrane filtration element is kept wet at the stage of packaging because the filtration operation can be started immediately when used in the filtration device. In this case, it is preferable to enclose a storage solution as appropriate depending on the storage period and the environmental conditions of storage and transportation. As a preservation solution, a known solution can be used depending on the purpose. For example, pure water may be used when the storage period is short and the temperature change is small at around 25 ° C. When the storage period is long and the temperature is less than or equal to zero degrees, an inorganic salt aqueous solution such as a glycerin aqueous solution or a calcium chloride aqueous solution is preferably used. In the present invention, the pore refers to a fine pore existing between the inner surface and the outer surface (thick part) of the hollow fiber membrane.

  When enclosing the preservation solution, it is preferable that the volume of water or aqueous solution in the hollow fiber membrane filtration element is 0.8 to 1.5 times the volume that the hollow fiber membrane can hold. More preferably, it is the range of 0.9 to 1.2 times. If it is 0.8 times or more, it is possible to prevent the tendency of the membrane performance from deteriorating as a result of the liquid being lost from the pores of the hollow fiber membrane during storage and transportation. If it is 1.5 times or less, the liquid does not accumulate in the package, and there is no possibility of reducing the adhesion between the hollow fiber membrane and the film. Here, the content volume of water or an aqueous solution is the volume of all liquids held in the package.

That is, (A) the liquid present in the pores of the hollow fiber membrane, (B) the liquid present in the hollow portion of the hollow fiber membrane, (C) the outer surface of the hollow fiber membrane and the constituent elements of the filtration element. (D) The total volume of the liquid accumulated in the film. The value of (D) can be known by collecting the liquid accumulated in the film and directly measuring the volume. The total value of the volumes (A), (B), and (C) can be known by the following method. First, (a) the weight Wa of the wet state hollow fiber membrane filtration element is measured. Next, (b) the hollow fiber membrane filtration element is immersed in water to replace the preservation solution with water, and then the hollow fiber membrane filtration element is dried. Thereafter, (c) the weight Wc of the dried hollow fiber membrane filtration element is measured. (D) When the density of the preservation solution is ρ, the value calculated by the following equation is the total value of the volumes (A), (B), and (C).
(Wa-Wc) / ρ

The volume that can be held by the hollow fiber membrane is the total volume of the volume of the hollow portion (lumen) and the volume of the pores of the hollow fiber membrane, and is a value calculated by the following equation.
(Inner diameter ² × π / 4 * hollow part length) + ((outer diameter ² −inner diameter ² ) * π / 4 * effective membrane length * porosity)
Here, the inner diameter and outer diameter are the inner diameter and outer diameter of the hollow fiber membrane, and the effective membrane length is the length of the filtration portion of the hollow fiber membrane, usually the length between the two end fixing portions. . The hollow portion length is the sum of the length of the end fixing portion on the side where the hollow portion is open and the effective membrane length. Furthermore, the porosity is the ratio of the pore volume of the hollow fiber membrane to the apparent volume of the thick portion of the hollow fiber membrane.

The package of the hollow fiber membrane filtration element of the present invention can be produced by the following method.
After manufacturing the hollow fiber membrane filtration element, (A) a step of surrounding the outer periphery of the boundary portion between the end fixing portion of the hollow fiber membrane filtration element and the hollow fiber membrane with a buffer material, and (B) the hollow fiber membrane filtration element gas The step of storing in the barrier film, (C) the step of storing the hollow fiber membrane filtration element in the protective film, and (D) removing the air in the film and sealing the film and the hollow fiber membrane in close contact with each other It is necessary to include the process to do. Furthermore, in the case of a package of hollow fiber membrane filtration elements in which the hollow fiber membrane is in a wet state, (E) a step of making the hollow fiber membrane in a wet state is necessary.

First, the process of surrounding the boundary portion of the end fixing portion of the hollow fiber membrane filtration element with a buffer material will be described.
In this process, a sheet-like cushioning material is wound around the end fixing portion and the hollow fiber membrane bundle, or a cushioning material previously formed so as to conform to the shape of the end fixing portion is prepared and used. This can be realized by a method of mounting. This process can be implemented after manufacturing a hollow fiber membrane filtration element, and before the process of accommodating in the film of a postscript, or can be implemented in the middle of accommodating. That is, a method of storing the cushioning material in the hollow fiber membrane filtration element and then storing it in the film, or a method of installing the cushioning material after sealing the hollow fiber membrane filtration element in the film and sealing it can be performed. . The former is preferable because of its good workability.

  Next, the process of accommodating in a film is demonstrated. A method in which a film is formed in a bag shape in advance and a hollow fiber membrane filter element is inserted into the bag may be used, or a filter element may be wrapped with a film. When a plurality of films are used, an operation of inserting or wrapping them in order is performed as appropriate. For example, when using a gas barrier film and a protective film, it is preferable to first store in a gas barrier film and then store in a protective film.

  Next, the process of closely attaching the film and the hollow fiber membrane will be described. This step can be performed by removing air in the film. First, a part of the film is opened so that air can be easily removed. This can be carried out by adhering or fusing the periphery except for a part of the outer periphery of the film. However, before storing the hollow fiber membrane filtration element as described above, adhering or fusing the periphery in advance to form a bag It is particularly preferable that As a method for removing air in the film, a method of removing air by sucking air from the opening or submerging the hollow fiber membrane filter element together with the film in which it is stored, and the air in the film is removed from the film by water pressure. The method of pushing to remove is mentioned.

  In the latter method, the film other than the opening is submerged in water, the opening is kept open to the atmosphere, air can exit from the opening, and water cannot enter the film. To. When the pressure is reduced by suction in the former method, the absolute pressure is 95 kPa or less, preferably in the range of 40 kPa to 90 kPa, and particularly preferably in the range of 70 kPa to 90 kPa. If the absolute pressure is 95 kPa or less, the film and the hollow fiber membrane can be brought into close contact with each other, and the effect of the present invention can be exerted. Even if there is some infiltration, the close contact state can be maintained. If it is 40 kPa or more, the film will not be plastically deformed by pressure to cause a decrease in strength, and a good state can be maintained over a long period of time. Moreover, if it is 70 kPa or more, when the hollow fiber membrane is in a wet state, the wetting liquid in the hollow fiber membrane is not vaporized and the performance of the membrane is not deteriorated.

  After the air in the film is removed as described above to bring the hollow fiber membrane and the film into close contact with each other, the film is sealed while maintaining the state. In sealing, if the sealing operation is performed while continuing the operation of removing air in the film, it is preferable that the sealing can be performed while the hollow fiber membrane and the film are kept in close contact with each other. As a sealing method, when the film is made of a heat-sealable material such as polyethylene, the film is heated and pressurized to be fused (hereinafter abbreviated as heat seal method). ) Is a particularly preferred method. As another method, a method of adhering the opening of the film with an adhesive can be employed.

  When storing and sealing in a plurality of films, (a) a method of performing a sealing operation every time each film is stored, or (b) performing a sealing operation for several sheets after storing in a plurality of films. Method (c) A method of performing an operation of sealing all films together after being accommodated in a plurality of films can be adopted. The method (a) is particularly suitable because the hollow fiber membrane and the film and the plurality of films can be brought into close contact with each other more reliably.

The step of bringing the hollow fiber membrane into a wet state is as follows.
When the material of the hollow fiber membrane is made of a hydrophilic material, the hollow fiber membrane can be brought into a wet state by simply contacting with water, such as by immersing the hollow fiber membrane in water. On the other hand, when the hollow fiber membrane is made of a hydrophobic material, the hollow fiber membrane is brought into contact with a liquid having a low interfacial tension, such as alcohol, so that the liquid penetrates into the pores, and is then brought into contact with water. The liquid in the pores can be wetted by replacing with water. Alternatively, the hollow fiber membrane filtration element can be immersed in water, and a wet state can be obtained by applying high pressure to the hollow fiber membrane and allowing water to enter the pores.
Furthermore, when enclosing the preservation solution, it is preferable to impregnate the preservation solution in the pores of the hollow fiber membrane. As a method of impregnating the storage solution, a method of using the storage solution instead of water in the above-mentioned wet state method or a method of replacing the water with the storage solution after being wetted by the above method is used. Can do.

  After the hollow fiber membrane is wetted as described above, excess liquid adhering to the hollow fiber membrane filtration element is allowed to flow out. The method of causing the adhered water to flow out is not particularly limited, but it is better to select a method and conditions that do not cause the liquid impregnated in the pores to flow out. For example, (a) a method in which the adhesion liquid is allowed to flow out by the action of gravity after being left in the air, (b) a method in which the adhesion liquid is caused to flow out by the action of centrifugal force by rotating the hollow fiber membrane filtration element, (c) Examples include a method in which high-humidity air is blown onto the hollow fiber membrane filtration element to cause the adhesion liquid to flow out by the action of wind force. By selecting the conditions at this time, it can be adjusted to a suitable content.

For example, in the method (a), the standing time is appropriately selected, in the method (b), the number of rotations and the rotation time are appropriately selected, and in the method (c), the flow velocity, flow rate, and time of the air to be blown are appropriately selected. By doing so, it can be adjusted to a suitable content.
The operation of making the wet state may be a method of bringing the hollow fiber membrane and the liquid into contact with each other in a dedicated water tank storing the liquid, or storing the hollow fiber membrane filtration element in the film and The method of contacting may be used.

Examples of the present invention will be described below, but the present invention is not limited thereby.
<< Manufacture of hollow fiber membrane filter element >>
The hollow fiber membrane filtration elements used in Examples 1 to 9 and Comparative Examples 1 and 2 were produced as follows.
3300 hollow fiber membranes 1 made of polyvinylidene fluoride and having a pore diameter of 0.1 μm, an outer diameter of 1.2 mm, an inner diameter of 0.6 mm, a length of 2160 mm, and a porosity of 70% were used. Further, as a member for fixing the hollow fiber membrane bundle as a filtering element, the upper head 2 having an inner diameter of 155 mm and a height of 70 mm and the lower ring 3 having an inner diameter of 140 mm and a height of 88 mm are connected to the upper head 2 and the lower ring 3. Two pipes having a diameter of 13 mm and a length of 2080 mm were used as the struts 8 to be connected. The upper head 2 is integrally provided with a casting cup (not shown) having an inner diameter of 140 mm and a depth of 35 mm. Further, in the lower ring, a partition for forming a membrane fixing portion is provided by partitioning a portion having a height of 38 mm out of a height of 88 mm perpendicular to the height direction by a partition plate. The partition plate is provided with 24 through holes 6 ′ having a diameter of 11 mm.

First, the upper head 2, the lower ring 3, and the pipe were fixed to the casting jig. The casting jig has a U-shaped cross section for storing the hollow fiber membrane bundle at the center and a length of 1800 mm, a head fixing portion for fixing the upper head 2 to one end, A ring fixing portion for fixing the lower ring 3 is provided on one end side. The bundle receiving portion, the head fixing portion, and the ring fixing portion are integrated by a base plate.
The hollow fiber membrane bundles were divided into 30 bundles of 110 pieces in a state where each hollow fiber membrane was loosened after closing a hollow portion of 5 mm from one end. The side where the hollow portion of each bundle was closed was inserted into a perforated plate (diameter 150 mm, thickness 10 mm) having 30 holes with a diameter of 17 mm, and the perforated plate was accommodated in the upper head 2. Moreover, the edge part by the side with the hollow part opened was accommodated in the lower ring.

Subsequently, 24 through-hole forming pins made of polyethylene having a diameter of 11 mm and a length of 70 mm were inserted into the hollow fiber membrane bundle through the through-hole 6 ′ provided in the lower ring 3 (only a part is shown). At this time, a cylindrical spacer (outer diameter 70 mm, length 800 mm) formed by winding a foamed polyethylene sheet having a thickness of 1 mm was previously inserted into the hollow fiber membrane bundle on the lower ring side, and the hollow fiber membrane Evenly distributed in the ring. The through-hole forming pin was a rod having a flange portion with a diameter of 15 mm and a thickness of 2 mm at one end, and the flange portion was in contact with the partition plate in the lower ring.
Thereafter, the periphery of the bundle of hollow fiber membranes was covered with a cloth, and a band was wound around the cloth receiving part of the casting jig and fixed. The casting jig was set on a centrifugal bonding mount.

The casting agent pot installed on the above-mentioned centrifugal bonding platform and the casting cup portion and the lower ring 3 provided on the upper head 2 were connected by an injection hose. A casting agent (a mixture of two-component mixed urethane resin) was put into this casting agent pot. Next, the centrifugal bonding mount was rotated at a speed of 177 rpm so that a 35 G centrifugal force was applied to the membrane fixing portion forming region. Rotation was stopped 90 minutes after the start of rotation, and the casting jig was removed from the centrifugal bonding platform. It cut | disconnected in the connection part of a casting cup part and an injection hose, and the connection part of a lower ring and an injection hose. This was heated in a dryer at 50 ° C. for 24 hours. Next, the hollow fiber membrane was opened by cutting near the boundary between the casting cup portion and the upper head 2.
Thereafter, the band was removed, the filtration element with the hollow fiber membrane bundle fixed thereto was taken out from the casting jig, and the spacer inserted in the hollow fiber membrane bundle on the lower ring side was removed. Moreover, all the through-hole formation pins inserted in the lower ring 3 were removed. As a result, a through hole having a diameter of 11 mm was formed in the end fixing portion on the lower ring side.

By the above operation, one end of the hollow fiber membrane bundle is fixed to the upper head 2 in a state of being divided into 30 small bundles, and the other end is dispersed in the state where each hollow fiber membrane is dispersed. An external pressure type hollow fiber membrane filtration element fixed to the ring 3 was obtained. The filtration element has an effective membrane length of 2000 mm and a membrane area of 25 m ² . The difference between the outer periphery of the hollow fiber membrane bundle at the end fixing portion of the upper head and the outer periphery of the upper head is 11 mm, and the outer periphery of the hollow fiber membrane bundle at the end fixing portion of the lower ring and the outer periphery of the lower ring are The difference is 5 mm. In addition, the volume which can hold | maintain the hollow fiber membrane in this hollow fiber membrane filtration element is 6.1 liters.

《Wetting treatment of hollow fiber membrane filter element》
Suction filtration was performed for 30 minutes in a state where the hollow fiber membrane filtration element was immersed in an aqueous 60 wt% ethanol solution, and the pores were filled with the aqueous solution. Next, the pores were sucked for 30 minutes while being immersed in running water to replace the inside of the pores with water.

《Measurement of pure water permeability of hollow fiber membrane filtration device》
After wet-treating the hollow fiber membrane filtration element, a cap with a nozzle was hermetically connected to the upper head via an O-ring, and immersed in a water tank filled with pure water. The nozzle portion was sucked so that the pressure was -0.03 MPa (gauge pressure), and the flow rate of water permeating through the hollow fiber membrane was measured. The water temperature at the time of measurement was adjusted to 25 ° C.
It was 3.3 m < ³ > / h when the hollow fiber membrane filtration element manufactured by the said method was measured.

<Measurement of content volume of preservation solution>
First, the film of the hollow fiber membrane filtration element package was cut, the stock solution flowing into the film was collected, and the volume Vz (l) was measured. Subsequently, the hollow fiber membrane filtration element was taken out from the film, and the weight Wa (kg) was measured. Thereafter, the hollow fiber membrane filtration element was immersed in water to replace the preservation solution with water, and then the hollow fiber membrane filtration element was heated and dried in a dryer. Next, the weight Wc (kg) of the dried hollow fiber membrane filtration element was measured. The density ρ of the preservation solution was obtained by separating the collected preservation solution in the film into a 10 ml Geryusack type specific gravity bottle, measuring the weight, and dividing the weight by the specific gravity volume. The content volume Vt (l) was determined by the following formula (1).
Vt = (Wa−Wc) / ρ + Vz (1)
Each of the above measurements was appropriately performed between leak tests and appearance inspections.

<< Transport test of hollow fiber membrane filter element packaging >>
The packaged hollow fiber membrane filter element was stored horizontally in a cardboard box and traveled on a truck for 2,000 km. Then, the hollow fiber membrane filtration element was taken out, and an appearance inspection and a leak inspection were performed.
In addition, the transport test was carried out by mounting the packaging bodies of Examples 1 to 10 and Comparative Examples 1 to 3 on the same truck.

<< Leak test of hollow fiber membrane filtration element >>
A cap with a nozzle was hermetically connected to the upper head of the hollow fiber membrane filtration element via an O-ring and immersed in water. With the hollow fiber membrane filtration element completely immersed in water, air was applied from the nozzle at a gauge pressure of 0.1 MPa, and it was visually observed whether bubbles appeared from the hollow fiber membrane. It was judged that there was a leak when bubbles appeared continuously.

[Example 1]
A multilayer film (made by Asahi Kasei, trade name “Barrieron-S, P type”) containing a polyvinylidene chloride layer and a low-density polyethylene layer is used as a gas barrier multilayer film. A low density polyethylene film having a thickness of 200 μm was used as a protective film. The multilayer film has a thickness of 50 μm and a moisture permeability measured by the method of ASTM-F1249 (38 ° C., 90% RH) of 6 g / (m ² · day). Each of the gas barrier film and the protective film was formed into a bag shape by heat-sealing two long sides and one short side in advance.
The cushioning material was wrapped around the outer periphery of the lower ring of the hollow fiber membrane filtration element manufactured as described above and the outer periphery of the hollow fiber membrane bundle from the lower ring to 200 mm and fixed with tape.

  Next, the hollow fiber membrane filtration element is housed in a bag-shaped gas barrier multilayer film, and a suction nozzle is inserted from the opening to suck the air inside, and the film adheres to the outer periphery of the hollow fiber membrane bundle. The pressure was reduced until The absolute pressure in the suction nozzle at this time was 60 kPa. Immediately after pulling out the suction nozzle, the opening side end of the film was heat-sealed with a width of 10 mm and sealed. Further, the package was housed in a protective film, and after reducing the pressure to 60 kPa in the same manner as described above, the opening side end of the film was heat-sealed with a width of 10 mm and sealed. As a result, a package of hollow fiber membrane filtration elements was obtained.

In the hollow fiber membrane filtration element package, the hollow fiber membrane bundle outer peripheral portion and the gas barrier film or cushioning material are in close contact with each other in an area of 95% or more in the length direction of the hollow fiber membrane. In the region of 30 mm, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film. In addition, since the level | step difference between an upper head end and a hollow fiber membrane bundle outer periphery is large, since the film cannot follow the level | step-difference part, it was in the state which has not contact | adhered.
The hollow fiber membrane filter element packaging body was stored horizontally in a cardboard box, and a truck transportation test was conducted. After running 2000 km, leak inspection was conducted and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
The hollow fiber membrane filtration element was wetted and the amount of pure water permeation measured was 3.2 m ³ / h, which was not significantly different from the measured value of the hollow fiber membrane filtration element immediately after production.

[Example 2]
First, before surrounding the lower ring with a cushioning material, the hollow fiber membrane filtration element is treated with pure water by the above-described method to make it wet, and then statically placed for 30 minutes in a vertical state in a 25 ° C.-70% RH environment. I put it. Using a filter element with the hollow fiber membrane in a wet state, the absolute pressure in the decompression operation in each film when stored in a gas barrier multilayer film and when stored in a protective film is changed to 85 kPa. In the same manner as in Example 1, two hollow fiber membrane filter element packaging bodies were produced. In the hollow fiber membrane filtration element package, the hollow fiber membrane bundle outer peripheral portion and the gas barrier film or cushioning material are in close contact with each other in an area of 95% or more in the length direction of the hollow fiber membrane. In the region of 30 mm, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
One of the two was opened, the liquid in the film was recovered, and the volume Vz was measured to be 0.2 liter. Next, the hollow fiber membrane filtration element was taken out from the film and the weight Wa was measured to find 13.6 kg. After that, when leak inspection was conducted, there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.4 m3 / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element immediately after production.
Thereafter, the hollow fiber membrane filtration element was heated and dried in a dryer, and the weight Wc in the dry state was measured to be 7.0 kg. The content volume was calculated based on the above formula (1) from these measured values and the density of the storage liquid (water) (1.0 kg / l), and the ratio with the holdable volume was calculated to be 1.1 times. .

The remaining one was stored in the room for 6 months, then opened and the liquid in the film was collected and the volume Vz was measured. Next, the hollow fiber membrane filtration element was taken out from the film and the weight Wa was measured to find 13.6 kg. After that, when leak inspection was conducted, there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.3 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element before storage.
Thereafter, the hollow fiber membrane filtration element was heated and dried in a dryer, and the weight Wc in the dry state was measured to be 7.0 kg. The content volume was determined from these measured values and the density (1.0 kg / l) of the preservation solution (water), and the ratio with the retained volume was calculated to be 1.1 times as described above.

[Example 3]
A multilayer film (trade name “Cans film, G type” manufactured by Shikoku Kasei Co., Ltd.) containing an ethylene vinyl alcohol copolymer layer, a nylon layer, and a low-density polyethylene layer is used as a cushioning material using a bubble sheet with a thickness of 2.3 mm. Used as a barrier multilayer film. The multilayer film has a thickness of 80 μm, and a moisture permeability measured by the method of ASTM-F1249 (38 ° C., 90% RH) is 8 g / (m ² · day). The wet treatment of the hollow fiber membrane was performed in the same manner as in Example 2 except that the standing time was 15 minutes. Further, the same protective film as in Example 1 was used.
Each of the gas barrier film and the protective film was formed into a bag shape by heat-sealing two long sides and one short side in advance.
A buffer material was wound twice around the entire outer periphery of the lower ring of the hollow fiber membrane filtration element subjected to the wet treatment and the outer periphery of the hollow fiber membrane bundle from the lower ring to 200 mm and fixed with tape.

Next, the hollow fiber membrane filtration element was accommodated in a gas barrier multilayer film in the form of a bag, and further accommodated in a protective film. A suction nozzle was inserted from the opening of the gas barrier multilayer film to suck the air inside, and the pressure was reduced until the film was in close contact with the outer periphery of the hollow fiber membrane bundle. The absolute pressure in the suction nozzle at this time was 85 kPa. Immediately after pulling out the suction nozzle, the opening side end of the gas barrier multilayer film was heat-sealed with a width of 10 mm and sealed. Thereafter, a suction nozzle was inserted through the opening of the protective film to suck the air inside, and the pressure was reduced until the film was in close contact with the gas barrier film. The absolute pressure in the suction nozzle at this time was 85 kPa. Immediately after pulling out the suction nozzle, the opening side end of the protective film was heat-sealed with a width of 10 mm and sealed. Two packages of hollow fiber membrane filtration elements were produced by such a method.
In the hollow fiber membrane filtration element package, the hollow fiber membrane bundle outer peripheral portion and the gas barrier film or cushioning material are in close contact with each other in an area of 95% or more in the length direction of the hollow fiber membrane. In the 50 mm region, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.4 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 13.9 kg, and 7.0 kg, respectively. When the content volume of the liquid was measured from these values and the density (1.0 kg / l) of the storage liquid (water) and the ratio with the volume that can be held was calculated, it was 1.2 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. Further, when the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no abnormality such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.2 m3 / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 13.9 kg, and 7.0 kg, respectively. From these values and the density of the storage liquid (water) (1.0 kg / l), the volume of the liquid was determined and the ratio with the volume that could be held was calculated to be 1.2 times as described above.

[Example 4]
Two packaging bodies were produced in the same manner as in Example 2, except that a 65% by weight aqueous glycerin solution was used as a preservation solution and the absolute pressure in the decompression operation in each film was changed to 80 kPa. In the hollow fiber membrane filtration element package, the hollow fiber membrane bundle outer peripheral portion and the gas barrier film or cushioning material are in close contact with each other in an area of 95% or more in the length direction of the hollow fiber membrane. In the region of 30 mm, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.3 m ³ / h, which was the same as the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the recovered storage solution (glycerin aqueous solution), the content volume of the solution was measured, and the ratio with the volume that could be held was calculated to be 1.5 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. Further, when the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no abnormality such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.4 m ³ / h, and there was no significant difference from the measured value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the collected preservation solution (glycerin aqueous solution), the content volume of the solution was calculated and the ratio with the holdable volume was calculated to be 1.5 times as described above. .

[Example 5]
Using a 30 wt% aqueous solution of calcium chloride as a preservative solution, the mixture was left to stand for 4 hours in an environment of 25 ° C. and a humidity of 40% RH, and wet treatment was performed, and the absolute pressure in the decompression operation in each film was changed to 80 kPa. The other two packages were produced in the same manner as in Example 2. In the hollow fiber membrane filtration element package, the hollow fiber membrane bundle outer peripheral portion and the gas barrier film or cushioning material are in close contact with each other in an area of 95% or more in the length direction of the hollow fiber membrane. In the region of 30 mm, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.2 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured in the same manner as in Example 2, they were 0.1 liter, 13.3 kg, and 7.0 kg, respectively. From these values and the density (1.30 kg / l) of the collected storage solution (calcium chloride aqueous solution), the volume of the solution was measured, and the ratio with the volume that could be held was calculated to be 0.8 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. Further, when the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no abnormality such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.2 m ³ / h, which was the same as the measured value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured in the same manner as in Example 2, they were 0.1 liter, 13.3 kg, and 7.0 kg, respectively. From these values and the density (1.30 kg / l) of the collected storage solution (calcium chloride aqueous solution), the content volume of the solution was calculated, and the ratio with the volume that can be held was calculated. It was.

[Example 6]
As the gas barrier film, a multilayer film (trade name “Triple Nylon” manufactured by Ozaki Light Chemical Co., Ltd.) including a 6-nylon layer and a low density polyethylene layer was used, and no protective film was used. The multilayer film has a thickness of 100 μm, and a moisture permeability of 8 g / (m ² · day) measured by the method of ASTM-F1249 (38 ° C., 90% RH). The gas barrier film composed of the multilayer film was formed into a bag shape by heat-sealing one side of the tube-shaped opening end in advance.
A package was obtained in the same manner as in Example 1 except that the pressure in the pressure reducing operation in the gas barrier film was 50 kPa.
The hollow fiber membrane filtration element package has a hollow fiber membrane bundle outer peripheral portion and a gas barrier film or cushioning material in close contact with each other in an area of 80% or more in the length direction of the hollow fiber membrane, and is approximately about the upper head end. In the region of 30 mm, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

The hollow fiber membrane filter element package was subjected to a truck transport test in the same manner as in Example 1. After running 2000 km, leak inspection was conducted and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
The hollow fiber membrane filtration element was wetted and the amount of pure water permeation measured was 3.2 m ³ / h, which was not significantly different from the measured value of the hollow fiber membrane filtration element immediately after production.

[Example 7]
An example in which a sponge sheet having an open cell structure with a thickness of 5 mm is used as a cushioning material is shown.
The hollow fiber membrane filtration element was wetted in the same manner as in Example 2 except that a 65 wt% aqueous glycerin solution was used as the storage solution. The cushioning material was wrapped around the hollow fiber membrane bundle outer periphery of the lower ring of the hollow fiber membrane filtration element and a portion of the lower ring from the lower ring to 200 mm, and fixed with tape. Subsequently, two packaging bodies were produced in the same manner as in Example 2 except that the absolute pressure in the decompression operation in each film was changed to 80 kPa.
In the hollow fiber membrane filtration element package, the hollow fiber membrane bundle outer peripheral portion and the gas barrier film or cushioning material are in close contact with each other in an area of 95% or more in the length direction of the hollow fiber membrane. In the region of 30 mm, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.4 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the recovered storage solution (glycerin aqueous solution), the content volume of the solution was measured, and the ratio with the volume that could be held was calculated to be 1.5 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. Further, when the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no flaw at all, and only a slight dent was produced, and it was estimated that there was no practical problem. In addition, the buffer material after taking out from the package body was plastically deformed and thinned.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.3 m ³ / h, which was the same as the measured value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the collected preservation solution (glycerin aqueous solution), the content volume of the solution was calculated and the ratio with the holdable volume was calculated to be 1.5 times as described above. .

[Example 8]
An example in which a molded product made of polyethylene foam is used as a cushioning material and arranged on the outer periphery of a hollow fiber membrane bundle is shown. The molded body is a cylinder having an inner diameter of 120 mm, an outer diameter of 150 mm, and a length of 300 mm, divided in half in the length direction.
The hollow fiber membrane filtration element was wetted in the same manner as in Example 2 except that a 65 wt% aqueous glycerin solution was used as the storage solution. Cover the outer periphery of the hollow fiber membrane bundle from the position 50 mm away from the boundary surface of the lower ring side end fixing portion of the hollow fiber membrane filtration element to the outer periphery of the hollow fiber membrane bundle and place the hollow body in the formed cylinder. After accommodating the thread membrane bundle, two cushioning materials were fixed with tape. At this time, the support column 8 was positioned at the joint of the two molded bodies. Subsequently, two packaging bodies were produced in the same manner as in Example 2 except that the absolute pressure in the decompression operation in each film was changed to 80 kPa.
In the hollow fiber membrane filtration element package, the outer periphery of the hollow fiber membrane bundle and the gas barrier film are in close contact with each other in a region of 70% or more in the length direction of the hollow fiber membrane, and the region of about 30 mm from the upper head end. In Fig. 1, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.3 m ³ / h, which was the same as the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the recovered storage solution (glycerin aqueous solution), the content volume of the solution was measured, and the ratio with the volume that could be held was calculated to be 1.5 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. When the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no abnormality such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.3 m3 / h, which was the same as the measurement value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the collected preservation solution (glycerin aqueous solution), the content volume of the solution was calculated and the ratio with the holdable volume was calculated to be 1.5 times as described above. .

[Example 9]
An example in which a foamed polyethylene molded product having an outer diameter of 70 mm and a total length of 500 mm is used as a cushioning material and is arranged inside a hollow fiber membrane bundle is shown. The molded body has a cylindrical shape with both ends exhibiting a hemispherical shape with an outer diameter of 70 mm, and is extremely light at about 80 g.
The hollow fiber membrane filtration element was wetted in the same manner as in Example 2 except that a 65 wt% aqueous glycerin solution was used as the storage solution. The molded body is inserted into the center of the hollow fiber membrane bundle so that the end of the molded body is located 50 mm away from the boundary surface of the lower ring side end fixing portion of the hollow fiber membrane filtration element. did. At the time of insertion, care was taken so that the hollow fiber membrane was not caught and damaged. Subsequently, two packaging bodies were produced in the same manner as in Example 2 except that the absolute pressure in the decompression operation in each film was changed to 80 kPa.
In the hollow fiber membrane filtration element package, the outer periphery of the hollow fiber membrane bundle and the gas barrier film are in close contact with each other in a region of 95% or more in the length direction of the hollow fiber membrane, and the region of about 30 mm from the upper head end. In Fig. 1, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were observed in detail, there were no abnormalities such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.3 m ³ / h, which was the same as the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the recovered storage solution (glycerin aqueous solution), the content volume of the solution was measured, and the ratio with the volume that could be held was calculated to be 1.5 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. When the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no abnormality such as partial dents and scratches.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.4 m ³ / h, and there was no significant difference from the measured value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.2 kg, and 7.0 kg, respectively. From these values and the density (1.16 kg / l) of the collected preservation solution (glycerin aqueous solution), the content volume of the solution was calculated and the ratio with the holdable volume was calculated to be 1.5 times as described above. .

[Example 10]
An example in which a hollow fiber membrane and a film are in close contact with each other without using a cushioning material is shown.
First, a hollow fiber membrane filtration element was produced as follows.
3300 hollow fiber membranes 1 made of polyvinylidene fluoride and having a pore size of 0.1 μm, an outer diameter of 1.2 mm, an inner diameter of 0.6 mm, a length of 2160 mm, and a porosity of 70% were used. Further, as a member for fixing the hollow fiber membrane bundle as a filtration element, an upper head 2 having an inner diameter of 155 mm and a height of 70 mm, a lower ring 3 having an inner diameter of 150 mm and a height of 88 mm, and the upper head 2 and the lower ring 3 are combined. Two pipes having a diameter of 13 mm and a length of 2080 mm were used as the struts 8 to be connected. The upper head 2 is integrally provided with a casting cup (not shown) having an inner diameter of 150 mm and a depth of 35 mm. Further, in the lower ring, a partition for forming a membrane fixing portion is provided by partitioning a portion having a height of 38 mm out of a height of 88 mm perpendicular to the height direction by a partition plate. The partition plate is provided with 19 through-holes 6 ′ having a diameter of 11 mm at intervals of 15 to 20 mm between the centers.

First, the upper head 2, the lower ring 3, and the pipe were fixed to the casting jig used in the manufacture of the hollow fiber membrane filtration elements of Examples 1-9. Nineteen through-hole forming pins made of polyethylene having a diameter of 11 mm and a length of 70 mm were inserted through a through-hole 6 ′ provided in the lower ring 3. In addition, this through-hole shaping | molding pin was the same as that used by manufacture of the hollow fiber membrane filtration element of Examples 1-9, and the collar part was made to contact | abut to the partition plate in a lower ring.
The hollow fiber membrane bundle was closed at a hollow portion of 5 mm from one end, and then divided into 30 bundles of 110 pieces in a state where each hollow fiber membrane was separated, and the end portion was fixed with a tape having a width of 5 mm. The side where the hollow portion of each bundle was closed was inserted into a perforated plate (diameter 150 mm, thickness 10 mm) having 30 holes with a diameter of 17 mm, and the perforated plate was accommodated in the upper head 2.
Next, the side where the hollow portions of the 110 small bundles were opened was inserted between the through-hole forming pins of the lower ring 3, and the 30 bundles were arranged so as to be substantially evenly distributed in the lower ring. At this time, a cylindrical spacer (outer diameter 70 mm, length 800 mm) formed by winding a foamed polyethylene sheet having a thickness of 1 mm was previously inserted into the hollow fiber membrane bundle on the lower ring side.
Then, the hollow fiber membrane filtration element was produced similarly to manufacture of the hollow fiber membrane filtration element of Examples 1-9.

By the above operation, one end of the hollow fiber membrane bundle is fixed to the upper head 2 in a state of being divided into 30 small bundles, and the other end is similarly divided into 30 small bundles Thus, an external pressure type hollow fiber membrane filtration element fixed to the lower ring 3 was obtained. The filtration element has an effective membrane length of 2000 mm and a membrane area of 25 m ² . The difference between the outer periphery of the hollow fiber membrane bundle at the end fixing portion of the upper head and the outer periphery of the upper head is 11 mm, and the outer periphery of the hollow fiber membrane bundle at the end fixing portion of the lower ring and the outer periphery of the lower ring are The difference is 5 mm. In addition, the volume which can hold | maintain the hollow fiber membrane in this hollow fiber membrane filtration element is 6.1 liters.

Subsequently, the hollow fiber membrane filtration element was wetted in the same manner as in Example 2 except that a 65% by weight glycerin aqueous solution was used as a preservation solution.
Thereafter, the hollow fiber membrane filtration element was housed in the same two types of films as in Example 2, and the package was prepared in the same manner as in Example 2 except that the absolute pressure in the decompression operation in each film was changed to 80 kPa. Two were produced. The package does not use a cushioning material.
In the hollow fiber membrane filtration element package, the outer periphery of the hollow fiber membrane bundle and the gas barrier film are in close contact with each other in a region of 95% or more in the length direction of the hollow fiber membrane, and the region of about 30 mm from the upper head end. In Fig. 1, the outer periphery of the hollow fiber membrane bundle was not in close contact with the gas barrier film.

A transport test was conducted on the two packages.
A leak test was conducted immediately after the transportation test in the same manner as in Example 2 for one, and there was no leak. Further, when the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no flaw at all, and only a slight dent was produced, and it was estimated that there was no practical problem.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.4 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.3 kg, and 7.1 kg, respectively. From these values and the density (1.16 kg / l) of the recovered storage solution (glycerin aqueous solution), the content volume of the solution was measured, and the ratio with the volume that could be held was calculated to be 1.5 times.
Further, the remaining one was stored at the same time as Example 2 for 6 months. A leak test was conducted after storage and there was no leak. Further, when the appearance of the hollow fiber membrane was observed in detail in the same manner as described above, there was no flaw at all, and only a slight dent was produced, and it was estimated that there was no practical problem.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.2 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element before storage.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.5 liter, 17.3 kg, and 7.1 kg, respectively. From these values and the density (1.16 kg / l) of the collected preservation solution (glycerin aqueous solution), the content volume of the solution was calculated and the ratio with the holdable volume was calculated to be 1.5 times as described above. .
When the hollow fiber membrane is fixed in a small bundle as in this embodiment, the cushioning material need not be used. Usually, a small bundle of 10 to 300, preferably 20 to 150 is preferable.

[Comparative Example 1]
A package was produced in the same manner as in Example 1 except that the cushioning material and the gas barrier film were not used and the film was sealed without the operation of removing the air in the film. In the package, the hollow fiber membrane and the film were not in close contact with each other, and the hollow fiber membrane was easily movable.
The package was subjected to a transportation test.
When a leak test was conducted in the same manner as in Example 1, leaks were confirmed at four locations. When the leak portion was observed, four hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were cut at the lower ring end. In addition, 15 hollow portions were confirmed in the hollow fiber membrane on the outer periphery of the hollow fiber membrane.

[Comparative Example 2]
Two packaging bodies were produced in the same manner as in Example 2 except that the gas barrier film was not used and the film was sealed without the operation of removing air in the film. In the package, the hollow fiber membrane and the film were not in close contact with each other, and the hollow fiber membrane was easily movable.
The package was subjected to a transportation test.
When one leak test was conducted in the same manner as in Example 2, there was no leak. When the appearance of the hollow fiber membrane was observed in detail, seven concave portions were confirmed.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 3.2 m ³ / h, which was not significantly different from the measurement value of the hollow fiber membrane filtration element immediately after production.
Moreover, when Vz, Wa, and Wc were measured similarly to Example 2, they were 0.2 liter, 13.6 kg, and 7.0 kg, respectively. The content volume of the liquid was determined from these values and the density (1.0 kg / l) of the collected storage liquid (water), and the ratio with the holdable volume was calculated to be 1.1 times.

Further, the remaining one was stored at the same time as Example 2 for 6 months. When a leak test was performed after storage, bubbles were continuously generated from a large number of hollow fiber membranes (not counted). When the hollow fiber membrane was observed, no particularly cut portions were found, but seven recessed portions were confirmed.
Subsequently, when the pure water permeation amount of the hollow fiber membrane filtration element was measured, it was 2.2 m ³ / h, which was significantly lower than the measured value of the hollow fiber membrane filtration element before storage.
When the hollow fiber membrane filtration element was immersed in a 60% by weight aqueous ethanol solution for wet treatment and then subjected to a leak test again, no bubbles were generated. From this result and the measurement result of the pure water permeation amount, it was determined that the bubbles generated during the leak test were a phenomenon caused by the loss of the liquid in the pores. That is, it was judged that the hollow fiber membrane was dried during storage for 6 months.

[Comparative Example 3]
Two packages were produced in the same manner as in Example 10 except that the film was sealed without removing the air in each film. In the package, the hollow fiber membrane and the film were not in close contact with each other, and the hollow fiber membrane was easily movable.
The package was subjected to a transportation test.
When one was subjected to a leak test in the same manner as in Example 2, a leak was confirmed at one location. When the appearance of the hollow fiber membrane was observed in detail, one hollow fiber membrane on the outer periphery of the hollow fiber membrane bundle was cut at the lower ring end. Further, in the hollow fiber membrane on the outer periphery of the hollow fiber membrane, 8 recessed portions were confirmed. When Vz, Wa, and Wc were measured in the same manner as in Example 2, they were 0.5 liter, 17.3 kg, and 7.1 kg, respectively. The content volume of the liquid was determined from these values and the density (1.16 kg / l) of the collected storage liquid (glycerin aqueous solution), and the ratio with the holdable volume was calculated to be 1.5 times.
Further, when the leak test was performed on the remaining one in the same manner, leaks were confirmed at two locations. When the appearance of the hollow fiber membrane was observed in detail, two hollow fiber membranes on the outer periphery of the hollow fiber membrane bundle were cut at the lower ring end. In addition, in the hollow fiber membrane on the outer periphery of the hollow fiber membrane, ten recessed portions were confirmed.

  In the package of the present invention, the hollow fiber membrane is not damaged during transportation, handling or storage, and when the hollow fiber membrane is wetted with a storage solution, the hollow fiber membrane is not damaged. And since it does not cause performance degradation, it is particularly useful as a package for a submerged hollow fiber membrane filtration element such as a hollow fiber membrane filtration element used in a membrane separation activated sludge method.

It is explanatory drawing which shows an example of a hollow fiber membrane filtration element. It is explanatory drawing which shows an example of the package body of a hollow fiber membrane filtration element.

Explanation of symbols

1: Hollow fiber membrane bundle 2: Upper head 3: Lower ring 4: Upper head side end fixing part 5: Lower ring side end fixing part 6: Through hole (through hole provided in lower ring side end fixing part )
6 ': Through hole (through hole provided in the partition plate in the lower ring)
7: Air reservoir
8: Strut 9: Buffer material 10: Gas barrier film
11: Protective film

Claims (17)

  A package in which an immersion type hollow fiber membrane filtration element having an end fixing portion in which at least one end portion of a hollow fiber membrane bundle composed of a plurality of hollow fiber membranes is fixed with a casting agent is wrapped with at least one film. The package of a hollow fiber membrane filtration element, wherein the film is sealed in a state where the film and at least a part of the hollow fiber membrane are in close contact with each other at at least one end fixing portion.   The hollow fiber membrane according to claim 1, wherein a buffer material is disposed between the film and the hollow fiber membrane filtration element so that damage to the hollow fiber membrane is avoided in at least one end fixing portion. A filter element package.   A cushioning material is disposed on the outer periphery of the boundary portion between at least one end fixing portion and the hollow fiber membrane so as to avoid damage to the hollow fiber membrane between the end fixing portion or the end fixing portion surrounding member and the film. The package of the hollow fiber membrane filtration element according to claim 1, wherein   The package of a hollow fiber membrane filtration element according to claim 2 or 3, wherein the cushioning material is a cushioning material having an independent space inclusion structure.   The package of a hollow fiber membrane filtration element according to claim 2 or 3, wherein the cushioning material comprises a foam sheet or a bubble sheet.   The package of hollow fiber membrane filtration elements according to any one of claims 1 to 5, wherein there are a plurality of films enclosing the hollow fiber membrane filtration elements, and at least one of the films includes a gas barrier film.   There are a plurality of films that enclose the hollow fiber membrane filtration element, the film includes a gas barrier film and a protective film, the gas barrier film and the hollow fiber membrane are in close contact, and the gas barrier film and the protective film further The package of the hollow fiber membrane filtration element according to any one of claims 1 to 5, wherein the package is in close contact.   The package of a hollow fiber membrane filtration element according to claim 6 or 7, wherein the gas barrier film has a thickness of 0.03 to 0.1 mm.   The package of a hollow fiber membrane filtration element according to any one of claims 6 to 8, wherein the gas barrier film is a multilayer film including at least a gas barrier layer and a heat-sealing layer.   The package of the hollow fiber membrane filtration element according to any one of claims 7 to 9, wherein the protective film has a thickness of 0.1 to 0.3 mm.   The sealed body of the hollow fiber membrane filtration element according to any one of claims 1 to 10, wherein the sealed film is in a reduced pressure state.   The hollow fiber membrane filtration element according to any one of claims 1 to 11, wherein the hollow fiber membrane filtration element is a hollow fiber membrane filtration element containing water or an aqueous solution in pores in the hollow fiber membrane. Packaging.   The package of the hollow fiber membrane filtration element according to claim 12, wherein the volume of water or aqueous solution is 0.8 to 1.5 times the volume that can be held by the hollow fiber membrane. The package body of the hollow fiber membrane filtration element according to any one of claims 1 to 13, wherein both end fixing portions are fixed as small bundles of 10 to 300 bundles.   When packaging a submerged hollow fiber membrane filtration element having an end fixing portion in which at least one end of a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes is fixed with a casting agent, the hollow fiber membrane filtration element is placed in the film. 2. The hollow fiber membrane according to claim 1, further comprising: a step of housing in a film; and a step of removing air in the film so that the hollow fiber membrane and the film are in close contact with each other and sealing while maintaining the state. A method for producing a filter element package.   When packaging a submerged hollow fiber membrane filtration element having an end fixing part in which at least one end part of a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes is fixed with a casting agent, (A) hollow fiber membrane filtration element A step of surrounding an outer periphery of a boundary portion between at least one end fixing portion and the hollow fiber membrane with a buffer material, (B) a step of housing the hollow fiber membrane filtration element in a gas barrier film, and (C) a hollow fiber membrane. And (D) removing the air in the film to bring the hollow fiber membrane and the film into close contact with each other, and sealing while maintaining the state. The manufacturing method of the hollow fiber membrane filtration element packaging body of Claim 2 or 3 to do.   Prior to the steps (A) to (D), the step (E) includes a step of causing the hollow fiber membrane filtration element to contain water or an aqueous solution, and the content volume of the water or aqueous solution is the volume that can be held by the hollow fiber membrane. The method for producing a hollow fiber membrane filtration element package according to claim 16, wherein the hollow fiber membrane filtration element contains water or an aqueous solution so as to be 0.8 to 1.5 times.

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