JP5962888B2 - Method for producing hollow fiber membrane module - Google Patents

Description

  The present invention generally relates to a method for manufacturing a hollow fiber membrane module, and more particularly, to a hollow fiber membrane module in which a liquid resin is injected into the bottom of a cylindrical casing in which a cylindrical body of the hollow fiber membrane is disposed at the bottom. It relates to a manufacturing method.

  In recent years, water purifiers for purifying tap water have been generally used in homes and the like. In such a water purifier, for example, the hollow fiber membrane module 18 (FIG. 1) in which the one end 14 a of the cylindrical body 14 of the hollow fiber membrane 12 is fixed by the adhesive (resin) layer 16 in the cylindrical casing 10. Often used as a filter medium.

When manufacturing such a hollow fiber membrane module 18, first, the hollow fiber membrane 12 is folded into a sheet shape with a fixed length many times, and then the vicinity of both ends is covered with a yarn 20 such as a polyester filament yarn. The long knitted fabric 22 is knitted (FIG. 2).
Next, the long knitted fabric 22 is cut into a predetermined length and wound in a direction perpendicular to the length direction of the hollow fiber membrane 12 around a center tube 24 for resin injection as shown in FIG. Let it be a cylindrical body 14 (FIG. 4).

And this cylindrical body 22 is accommodated in the bottom part of the cylindrical casing 10 by which the end was closed by the baseplate 10a. Further, a discharge pipe 26 of a resin pot (liquid resin reservoir container) 28 in which a discharge pipe 26 is integrally formed at the lower part is inserted into a center tube 24 wound around the center of the cylindrical body 22, and further into the resin pot 28. A liquid resin R for fixation is injected (FIG. 5) to obtain an intermediate M of the hollow fiber membrane module.
The intermediate M is attached to the centrifuge, and the liquid resin R is filled in the resin potting 28 through the center tube 24 to the bottom of the cylindrical casing 10 as shown by the arrow A and bonded to the bottom of the cylindrical casing 10. An agent (resin) layer 16 is formed.

The columnar body 22 is fixed to the inner peripheral surface of the cylindrical casing 10 by the adhesive (resin) layer 16 (Patent Document 1).
And the hollow fiber membrane module 18 (FIG. 1) which the hollow fiber membrane opened on the one end side is obtained by cut | disconnecting the bottom part of the cylindrical casing 10 along the line shown by the dotted line B.

Japanese Patent No. 4338404

  Here, the liquid resin is injected into the resin pot by a known dispenser nozzle. During the injection into the resin pot, when the liquid resin is injected from the injection nozzle into the resin pot, air is entrained in the injected liquid resin, and bubbles may be generated in the liquid resin in the resin pot.

When the intermediate M of the hollow fiber membrane module in which bubbles are present in the liquid resin in the resin pot is attached to the centrifuge and the liquid resin in the resin pot is filled in the bottom of the cylindrical casing, the bubbles in the liquid resin also Air bubbles remain in the cured adhesive (resin) layer that is fed into the cylindrical casing and formed at the bottom of the cylindrical casing.
Since the resin layer formed at the bottom of the cylindrical casing has a sealing function that separates raw water and purified water, separation of the raw water and purified water can be achieved by creating an opening communicating with the sealing portion by bubbles in the resin layer. This may cause problems such as a decrease in performance, which is not preferable.
Moreover, the resin layer in which bubbles are formed also has a problem that the strength is lowered.

  In addition, since the liquid resin has a relatively high viscosity, it takes a very long time for the bubbles to rise to the surface of the resin and disappear spontaneously. It is not preferable from the viewpoint.

  The present invention has been made to solve such a problem, and it is possible to avoid the generation of bubbles in the resin layer formed at the bottom of the cylindrical casing without reducing the working efficiency. It aims at providing the manufacturing method of a thread membrane module.

According to the present invention,
A method of manufacturing a hollow fiber membrane module in which a cylindrical body of a hollow fiber membrane is disposed at the bottom of a cylindrical casing, and a liquid resin is injected into the bottom of the cylindrical casing to form a resin layer at the bottom of the cylindrical casing. ,
On the cylindrical body of the hollow fiber membrane disposed at the bottom of the cylindrical casing, placing a resin pot having a discharge pipe formed at the lower end;
Injecting the liquid resin from an injection nozzle into the resin pot disposed on the cylindrical body of the hollow fiber membrane;
Placing the cylindrical casing in a centrifuge, operating the centrifuge, and injecting the liquid resin injected into the resin pot into the bottom of the cylindrical casing by centrifugal force, and
In the pouring step, the pouring nozzle injects the liquid resin at a pouring rate of 1 to 50 g / sec at a position offset from the inlet to the discharge pipe of the resin pot .
A method for producing a hollow fiber membrane module is provided.

  According to such a configuration, when the liquid resin is injected from the injection nozzle into the resin pot, the injected liquid resin collides with the inner surface of the resin pot at a position shifted from the inlet to the discharge pipe formed in the resin pot. . Most of the entrainment of gas in the injected liquid resin occurs when the injected resin collides with the vicinity of the inlet to the discharge pipe. Therefore, according to the present invention having the above configuration, the gas in the liquid resin Entrainment of is suppressed.

According to another preferred embodiment of the invention,
The resin pot has a bottomed cylindrical shape with an open upper end;
The said discharge pipe is arrange | positioned in the approximate center position of the bottom of the said resin pot.

According to another preferred embodiment of the invention,
The bottom of the resin pot is inclined downward toward the center.

According to another preferred embodiment of the invention,
The injection nozzle injects the liquid resin toward the bottom of the resin pot inclined downward.
According to such a configuration, the injected resin flows toward the inlet of the discharge port along the inclined surface at the same time as the collision, so that gas entrainment is more effectively suppressed.

According to another preferred embodiment of the invention,
The injection nozzle injects the liquid resin toward the side wall of the resin pot.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the hollow fiber membrane module which can avoid generation | occurrence | production of the bubble in the resin layer formed in the bottom part of a cylindrical casing is provided, without reducing working efficiency.

It is sectional drawing of the hollow fiber membrane module manufactured using the jig | tool of the preferable aspect of this invention. It is a top view of the elongate knitted fabric of the hollow fiber membrane used for the hollow fiber membrane module of FIG. It is a perspective view of the center tube used at the time of manufacture of the hollow fiber membrane module of FIG. It is a perspective view of the cylindrical body of the hollow fiber membrane used with the hollow fiber membrane module of FIG. It is sectional drawing of the intermediate body of a hollow fiber membrane module for demonstrating the manufacturing process of the hollow fiber membrane module of FIG. It is sectional drawing for demonstrating the liquid resin injection | pouring step of the manufacturing method of the hollow fiber membrane module of the 1st Embodiment of this invention. It is drawing explaining the liquid resin injection | pouring step of the manufacturing method of the hollow fiber membrane module of the 1st Embodiment of this invention. It is drawing explaining the modification of the liquid resin injection | pouring step of the manufacturing method of the hollow fiber membrane module of the 1st Embodiment of this invention. It is sectional drawing for demonstrating the liquid resin injection | pouring step of the manufacturing method of the hollow fiber membrane module of the 2nd Embodiment of this invention. It is sectional drawing for demonstrating the liquid resin injection | pouring step of the manufacturing method of the hollow fiber membrane module of the 3rd Embodiment of this invention.

Hereinafter, with reference to drawings, the manufacturing method of the hollow fiber membrane module of the 1st embodiment of the present invention is explained.
The manufacturing method of the hollow fiber membrane module of the present embodiment is basically the same as the manufacturing method of the hollow fiber membrane module of Patent Document 1 described above, except for the liquid resin injection step. Hereinafter, the liquid resin injection step will be mainly described. FIG. 6 is a cross-sectional view for explaining a liquid resin injection step in the method for manufacturing a hollow fiber membrane module according to a preferred embodiment of the present invention.

In the manufacturing method of the hollow fiber membrane module of the present embodiment, after the hollow fiber membrane 12 is turned into a sheet shape with a fixed length many times, the vicinity of both ends of the hollow fiber membrane module is overlaid with a polyester filament yarn or the like. A long knitted fabric 22 (FIG. 2) is knitted with the yarn 20.
Next, the long knitted fabric 22 is cut into a predetermined length and wound in a direction perpendicular to the length direction of the hollow fiber membrane 12 around a center tube 24 for resin injection as shown in FIG. Let it be a cylindrical body 14 (FIG. 4).

  And this cylindrical body 14 is accommodated in the bottom part of the cylindrical casing 10 by which the end was closed by the baseplate 10a. Further, the discharge pipe 26 of the resin pot (liquid resin reservoir container) 28 in which the discharge pipe 26 is integrally formed at the lower part is inserted into the center tube 24 wound around the center of the cylindrical hollow fiber membrane (columnar body) 22. Further, a fixing liquid resin R is put in the resin pot 28 (FIG. 6) to obtain an intermediate M0 of the hollow fiber membrane module.

  The intermediate body M0 is attached to the centrifuge, and the resin in the resin potting 28 is filled into the bottom of the cylindrical casing 10 through the center tube 24 as indicated by an arrow A, and an adhesive ( Resin) layer 16 is formed.

The columnar body 22 is fixed to the inner peripheral surface of the cylindrical casing 10 by the adhesive (resin) layer 16 (Patent Document 1).
And the hollow fiber membrane module 18 (FIG. 1) which the hollow fiber membrane opened by the one end side is obtained by cut | disconnecting the bottom part of the cylindrical casing 10 along the line shown by the dotted line B.

  In the present embodiment, hollow fiber membranes made of various materials such as cellulose, polyolefin, polyvinyl alcohol, PMMA (polymethyl methacrylate), and polysulfone are used as the hollow fiber membrane to be used. In particular, a hollow fiber membrane made of a material having high elongation such as polyethylene is preferable.

  In addition, the hole diameter, porosity, film thickness, outer diameter, and the like of the hollow fiber membrane are not particularly limited as long as the hollow fiber membrane can be used as a filtration membrane. It is preferable that the diameter is 2000 μm, the pore diameter is 0.01 to 1 μm, the porosity is 20 to 90%, and the film thickness is about 5 to 300 μm.

  The casing 10 may be made of any material having mechanical strength and durability. For example, polycarbonate, polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, modified PPE (polyphenylene ether), etc. Is used.

  As the fixing liquid resin, an epoxy resin, an unsaturated polyester resin, a polyurethane resin, a silicone-based filler, various hot melt resins, and the like can be used, and can be appropriately selected. Moreover, the viscosity of the liquid resin before solidification is not particularly limited, but is preferably 500 to 5000 mPa · s, and more preferably 2000 to 3000 mPa · s.

  If the viscosity of the liquid resin is less than 500 mPa · s, the liquid resin may flow to the opening end of the hollow fiber membrane and cause the opening end to be blocked. If the viscosity of the liquid resin exceeds 5000 mPa · s, it is difficult to impregnate between the hollow fiber membranes, which is not preferable.

  According to the method for manufacturing the hollow fiber membrane module of the present embodiment, the liquid resin R is injected into the resin pot 28 by the injection nozzle 30 in the liquid resin injection step. The resin pot 28 is a member integrally formed of synthetic resin, and includes a bottomed cylindrical main body 28a and a cylindrical discharge pipe 26 integrally provided at the lower portion of the main body.

  The bottom of the main body 28a is formed by a disk-shaped bottom plate 28b disposed substantially orthogonal to the side wall of the main body. A circular opening 28c is formed in the center of the disk-shaped bottom plate 28b. This opening 28 c communicates with the internal space of the discharge pipe 26 and constitutes the inlet of the discharge pipe 26.

  In the liquid resin injection step, the liquid resin R is injected into a position where the tip of the injection nozzle 30 for discharging the liquid resin is offset from the opening 28c which is the inlet of the discharge pipe 26 formed in the bottom plate 28b of the resin pot 28. (FIG. 6). The injection speed of the liquid resin R is preferably 1 to 50 g / second, and more preferably 10 to 20 g / second.

  As a result, the resin R discharged from the injection nozzle 30 collides with a flat portion where the opening 28c of the bottom plate 28b of the resin pot 28 is not formed, and spreads into the resin pot 28.

In the present embodiment, as shown in FIG. 7, 15 hollow fiber membrane module intermediates M0 are arranged side by side in the case C, and the case C and the nozzle 30 are arranged in the X-axis (horizontal axis) direction and The liquid resin R is poured into the resin pot 28 of each intermediate M0 in the case C while being relatively moved in the Y-axis (vertical axis) direction.
Since the injection of the liquid resin is performed in a state where the tip of the injection nozzle 30 is disposed in the resin pot 28, the case C and the injection nozzle 30 are moved in the Z-axis (vertical) direction when the liquid resin is injected into the resin pot 28. It is configured to allow relative movement.

  FIG. 8 is a modification of the method for manufacturing the hollow fiber membrane module of the first embodiment, and is an intermediate M of a plurality of hollow fiber membrane modules housed in a case C ′ different from the case of the first embodiment. It is a typical perspective view which shows the state which has inject | poured liquid resin from the injection nozzle 30 in FIG. In this example, the liquid resin R is sequentially injected into each resin pot 28 of the intermediate body M in the case C ′ while relatively moving the case C and the nozzle 30 in the Y-axis (vertical axis) direction.

  Also in this example, since the injection of the liquid resin is performed in a state where the tip of the injection nozzle 30 is disposed in the resin pot 28, the case C and the injection nozzle 30 are placed in the Z axis when the liquid resin is injected into the resin pot 28. It is configured to be able to move relative to the (vertical) direction.

  FIG. 9 is a cross-sectional view for explaining a liquid resin injection step of the method for manufacturing the hollow fiber membrane module according to the second embodiment of the present invention. The intermediate body M0 ′ of the hollow fiber membrane module of the embodiment of FIG. 9 differs from the intermediate body M0 of the hollow fiber membrane module of the first embodiment only in the shape of the resin pot.

  As is apparent from FIG. 9, in the second embodiment, the bottom 32b of the resin pot 32 is inclined downward toward the center where the opening 32c is formed, and the lower portion of the resin pot 32 has a funnel shape. Yes.

  Also in the embodiment of FIG. 9, in the liquid resin injection step, the liquid resin is placed at a position where the tip of the injection nozzle 30 for discharging the liquid resin is offset from the inlet 32 c of the discharge pipe 26 formed in the bottom plate 32 b of the resin pot 32. Arranged to inject R. As a result, the resin R discharged from the injection nozzle 30 collides with a flat inclined surface where the opening 32c of the bottom plate 32b of the resin pot 32 is not formed, and spreads into the resin pot 32. .

  According to such a configuration, the injected resin flows along the inclined surface toward the outlet 32c of the discharge port at the same time as the collision, so that gas entrainment is more effectively suppressed.

  FIG. 10: is sectional drawing for demonstrating the liquid resin injection | pouring process of the manufacturing method of the hollow fiber membrane module of the 3rd Embodiment of this invention. The embodiment of FIG. 10 differs from the resin of the first embodiment in the injection position of the liquid resin.

  As is apparent from FIG. 10, in the third embodiment, in the liquid resin injection step, the injection nozzle 30 discharges the liquid resin R toward the inner peripheral surface of the side wall 28 d of the resin pot 28.

  According to such a configuration, the injected resin flows along the inner peripheral surface of the side wall toward the outlet 28c at the same time as the collision, so that the gas entrainment is more effectively suppressed.

  Without being limited to the above-described embodiment of the present invention, various changes and modifications can be made within the scope of the technical idea described in the claims.

  In the above embodiment, the case C and the injection nozzle 30 can be moved relative to each other in the Z-axis (vertical) direction during injection into each of the intermediate bodies M0 and M0 ′. In addition, during injection of the liquid resin R into the resin pots 28 and 32 of each intermediate M, the injection nozzle may be raised as the liquid level of the liquid resin in the resin pots 28 and 32 rises.

10: Cylindrical casing 12: Hollow fiber membrane 14: Column 24: Center tube 28: Resin pot 28a: Main body 28b: Bottom plate 28c: Opening 30: Injection nozzle

Claims (5)

A method of manufacturing a hollow fiber membrane module in which a cylindrical body of a hollow fiber membrane is disposed at the bottom of a cylindrical casing, and a liquid resin is injected into the bottom of the cylindrical casing to form a resin layer at the bottom of the cylindrical casing. ,
On the cylindrical body of the hollow fiber membrane disposed at the bottom of the cylindrical casing, placing a resin pot having a discharge pipe formed at the lower end;
Injecting the liquid resin from an injection nozzle into the resin pot disposed on the cylindrical body of the hollow fiber membrane;
Placing the cylindrical casing in a centrifuge, operating the centrifuge, and injecting the liquid resin injected into the resin pot into the bottom of the cylindrical casing by centrifugal force, and
In the pouring step, the pouring nozzle injects the liquid resin at a pouring rate of 1 to 50 g / sec at a position offset from the inlet to the discharge pipe of the resin pot .
A method for producing a hollow fiber membrane module. The resin pot has a bottomed cylindrical shape with an open upper end;
The discharge pipe is disposed at a substantially central position at the bottom of the resin pot,
The manufacturing method of the hollow fiber membrane module of Claim 1. The bottom of the resin pot is inclined downward toward the center,
The manufacturing method of the hollow fiber membrane module of Claim 1 or 2. The injection nozzle injects the liquid resin toward the bottom of the resin pot inclined downward.
The manufacturing method of the hollow fiber membrane module of Claim 3. The injection nozzle injects the liquid resin toward a side wall of the resin pot;
The manufacturing method of the hollow fiber membrane module of Claim 2 or 3.

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