JP5238869B2 - Manufacturing method of bag-like separation membrane - Google Patents

Description

  The present invention relates to a method for producing a bag-like separation membrane.

  Conventionally, a bag-like separation membrane used in a membrane separation device that purifies water by osmotic pressure is manufactured by stacking a pair of separation membranes and adhering the edges of the three sides with an adhesive. (For example, refer to Patent Document 1)

Japanese Patent Laid-Open No. 10-341

  In such a bag-like separation membrane, the permeation hole of the separation membrane is blocked by the adhesive, so that the permeation function of the separation membrane is reduced because the water permeation function is lost at the bonded portion. Therefore, it is desirable that the bonded portion of the separation membrane is within a specified range for maintaining the bonding strength. However, in the manufacture of the conventional bag-shaped separation membrane, one of the pair of separation membranes is used. Adhesive is applied, the other separation membrane is pressed against this separation membrane, and the adhesive is sandwiched between the pair of separation membranes to bond the pair of separation membranes. There is a problem that it is difficult to manage the area of the junction of the pair of separation membranes.

  Therefore, an object of the present invention is to make it possible to easily manage the area of the joint portion of a pair of separation membranes in a bag-like separation membrane.

A first aspect of the present invention is a method for producing a bag-shaped separation membrane to produce a pair of the separation membrane, a bag-shaped separation membrane and a spacer interposed between a pair of the separation membrane, a pair of the One of the separation membranes has a larger area than the other separation membrane, and the larger separation membrane is folded over and covered with the smaller separation membrane. A portion of the separation membranes are bonded to each other.

According to the present invention, in the bag-shaped separation membrane, the area of the joint portion between the pair of separation membranes can be easily managed. One separation membrane of a pair of separation membranes has a larger area than the other separation membrane, and the larger separation membrane is folded so that the smaller separation membrane has a larger area. Covering, by joining the pair of separation membranes of the covered portion, the entire area of the surface opposite to the separation membrane side of the separation membrane with the larger area becomes a region where water can permeate, The effective permeation area of the separation membrane can be increased.

It is a top view which shows the bag-shaped separation membrane concerning the 1st Embodiment of this invention. It is a disassembled perspective view which shows the bag-shaped separation membrane concerning the 1st Embodiment of this invention. The clamping member concerning the 1st Embodiment of this invention is shown, (a) is a side view, (b) is a top view. It is a side view which shows the state which the clamping member concerning the 1st Embodiment of this invention clamped the separation membrane. It is an enlarged view of the V section of FIG. It is a side view which shows the clamping member of the modification concerning the 1st Embodiment of this invention. It is a top view which shows the bag-shaped separation membrane concerning the 2nd Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing method of the bag-shaped separation membrane concerning the 2nd Embodiment of this invention. It is a top view which shows the bag-shaped separation membrane concerning the 3rd Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing method of the bag-shaped separation membrane concerning the 3rd Embodiment of this invention. It is a top view which shows the bag-shaped separation membrane concerning the 4th Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing method of the bag-shaped separation membrane concerning the 4th Embodiment of this invention. It is a vertical side view which shows the bag-shaped separation membrane concerning the 5th Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing method of the bag-shaped separation membrane concerning the 5th Embodiment of this invention. It is a vertical side view which shows the bag-shaped separation membrane concerning the 6th Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing method of the bag-shaped separation membrane concerning the 6th Embodiment of this invention. It is a top view which shows the bag-shaped separation membrane concerning the 7th Embodiment of this invention. It is explanatory drawing for demonstrating the manufacturing method of the bag-shaped separation membrane concerning the 7th Embodiment of this invention.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS.

  The bag-like separation membrane 1 of this embodiment shown in FIG. 1 is a reverse osmosis membrane that is used in a membrane separation device that purifies water by osmotic pressure and separates water into purified water (permeated water) and concentrated water.

  As shown in FIGS. 1 and 2, the bag-like separation membrane 1 includes a pair of separation membranes 2 and 3 connected to each other, a spacer 4 interposed between the pair of separation membranes 2 and 3, and a pair of separations. Nipping members 5A, 5B, and 5C as joining means for joining the films 2 and 3 are provided and formed in a bag shape. That is, one end of the bag-like separation membrane 1 is opened. The bag-like separation membrane 1 is attached to a membrane separation device, for example, in a spirally wound state. In the bag-like separation membrane 1, the spacer 4 is interposed between the pair of separation membranes 2 and 3, so that a flow path is reliably secured between the pair of separation membranes 2 and 3.

  The pair of separation membranes 2 and 3 and the spacer 4 are formed as separate parts. The pair of separation membranes 2 and 3 and the spacer 4 are formed in a rectangular shape and are formed with a plurality of transmission holes. The separation membranes 2 and 3 and the spacer 4 are formed in a sheet shape from a resin, and the spacer 4 is formed smaller than the separation membranes 2 and 3.

  The pair of separation membranes 2 and 3 are joined to each other with the edge portions of the three sides sandwiched between the sandwiching members 5A, 5B, and 5C. In the following description, these sandwiching members 5A, 5B, and 5C may be simply described using reference numeral 5 for convenience of description.

  As shown in FIG. 3, the holding member 5 includes a clip portion 6 and a self-adhesive resin sheet 7 fixed to the clip portion 6. The clip portion 6 includes a pair of pressing plate portions 6a, a connecting portion 6b that connects one edge portions of the pair of pressing plate portions 6a, and a sealing portion 6c that is fixed to the other edge portion of each pressing plate portion 6a. And is configured. An effective sandwiching portion of the sandwiching member 5 according to the present embodiment is in the range of the width a of the sealing portion 6c. The self-adhesive resin sheet 7 is positioned between the pair of pressing plate portions 6a and is fixed to the connecting portion 6b. The self-adhesion resin sheet 7 is a well-known sheet that can be adhered to other self-adhesion resin sheets 7.

  As shown in FIG. 4, the sandwiching member 5 having such a structure sandwiches the edge portions of the pair of separation films 2 and 3 inserted between the pair of holding plate portions 6 a of the clip portion 6 by the spring force of the clip portion 6. doing. At this time, the sealing portion 6 c is in contact with the pair of separation membranes 2 and 3, and the self-adhesive resin sheet 7 is interposed between the pair of separation membranes 2 and 3. The spacer 4 is not sandwiched between the clip portions 6. And in the connection part of adjacent clamping member 5, self-adhesion resin sheet 7 overlaps, these two self-adhesion resin sheets 7 adhere, and the adhesion part b is formed. The sandwiching member 5 prevents water from entering between the separation membranes 2 and 3 from the edges of the separation membranes 2 and 3 by the sealing portion 6c, the self-adhesive resin sheet 7 and the adhesion portion b.

  As described above, in the bag-shaped separation membrane 1 of the present embodiment, the joining means for joining the pair of separation membranes 2 and 3 is the sandwiching member 5 that sandwiches the pair of separation membranes 2 and 3. Since the clamping area by the clamping member 5 does not change, the management of the area of the joint between the pair of separation membranes 2 and 3 can be easily performed. Therefore, it can suppress that the permeation | transmission effective area of the separation membranes 2 and 3 reduces.

  Moreover, in this embodiment, since a pair of separation membranes 2 and 3 are joined by clamping of the clamping member 5, it is not necessary to use an adhesive for joining a pair of separation membranes 2 and 3, and an adhesive is used. Since a necessary drying step is unnecessary, the manufacturing time can be shortened.

  Next, a sandwiching member 105 of a modification according to the present embodiment will be described with reference to FIG. The sandwiching member 105 of this modification is different from the sandwiching member 5 in the shape of the pair of sealing portions 6 d and 6 e of the clip portion 106. One sealing portion 6d is formed in a semicircular shape when viewed from the side, while the other sealing portion 6e is formed in a concave shape so that the sealing portion 6d can be fitted into these sealing portions 6d, 6e. Are designed to fit together. In this structure, since the pair of sealing portions 6d and 6e are fitted to each other, the separation membranes 2 and 3 can be sandwiched more firmly. Moreover, in this structure, when water pressure acts from the outside, it will be in a stronger fitting state and the separation membranes 2 and 3 can be joined more firmly.

  The spacer 4 may be sandwiched by the clip portion 6 together with the pair of separation membranes 2 and 3.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is provided to the same part as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The bag-like separation membrane 201 of the present embodiment is different from the bag-like separation membrane 1 of the first embodiment in the joining means for joining the pair of separation membranes 2 and 3.

  In this embodiment, as shown in FIGS. 7 and 8, the spacer 4 is formed to have approximately the same size as the separation membranes 2 and 3, and a pair of separation membranes is formed by the melting portion 4 a of the spacer 4 as a joining means. 2 and 3 are joined. That is, in the present embodiment, the fusion part 4 a of the spacer 4 is interposed at the joint part between the pair of separation membranes 2 and 3. Here, the spacer 4 and the separation membranes 2 and 3 are made of resin, but the melting temperature of the spacer 4 is lower than the melting temperature of the separation membranes 2 and 3.

  A method for manufacturing the bag-like separation membrane 201 will be described. As shown in FIG. 8, first, a spacer 4 is inserted between a pair of separation membranes 2 and 3, and the pair of separation membranes 2 and 3 and the spacer 4 are overlapped. Note that FIG. 8 is a diagram in which there is a gap between the separation membranes 2 and 3 and the spacer 4 for convenience of explanation, but actually, the separation membranes 2 and 3 and the spacer 4 are overlapped in a state so that there is no gap.

  Next, the spacer 4 is heated and melted from the outside by the heating device 211, and the pair of separation membranes 2 and 3 are joined together to obtain the bag-like separation membrane 201. At this time, in this embodiment, the spacer 4 is heated and melted from the outside through the separation membrane 2 by moving the heating device 211 along the three sides of the separation membrane 2 to the surface of one separation membrane 2. ing. The fusion part 4a of the spacer 4 adheres to the separation membranes 2 and 3, and the fusion part 4a cools and solidifies, whereby the separation membranes 2 and 3 are connected by the fusion part 4a. Here, the heating device 211 is, for example, a heating device that radiates heat. The heating temperature by the heating device 211 is set to be equal to or higher than the melting temperature of the spacer 4 and lower than the melting temperature of the separation membranes 2 and 3. Here, the arrows in FIG. 8 indicate the movement path of the heating device 211.

  As described above, in the present embodiment, the spacer 4 is melted by heating from the outside, and the pair of separation membranes 2 and 3 are joined together to obtain the bag-like separation membrane 201. Since the melted area of the spacer 4 by heating from the outside can be managed relatively easily, the area of the joint portion between the pair of separation membranes 2 and 3 can be easily managed. Therefore, it can suppress that the permeation | transmission effective area of the separation membranes 2 and 3 reduces.

  In the present embodiment, the spacer 4 is melted and the pair of separation membranes 2 and 3 are joined together. However, the present invention is not limited to this, and at least one of the separation membranes 2 and 3 is melted to separate the separation membrane. You may join 2 and 3 without the spacer 4 interposed. Further, the heating device 211 may be one that heats the spacer 4 and the separation membranes 2 and 3 by oscillating ultrasonic waves, or the heated plate is pressed against the separation membranes 2 and 3 to cause the spacer 4 and the separation membranes to be heated. 2 and 3 may be heated.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. 9 and FIG. In addition, the same code | symbol is provided to the same part as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The bag-like separation membrane 301 of the present embodiment is different from the bag-like separation membrane 1 of the first embodiment in the joining means for joining the pair of separation membranes 2 and 3.

  In this embodiment, as shown in FIGS. 9 and 10, the pair of separation membranes 2 and 3 are joined by an adhesive portion 310 as a joining means. The bonding portion 310 includes an adhesive that is exposed from the microcapsule after the microcapsule is broken. The adhesive bonds the pair of separation membranes 2 and 3 together.

  A method for manufacturing the bag-like separation membrane 301 will be described. As shown in FIG. 10, first, a spacer 4 is inserted between a pair of separation membranes 2 and 3, and the pair of separation membranes 2 and 3 and the spacer 4 are overlapped. Note that FIG. 10 is a diagram in which there is a gap between the separation membranes 2 and 3 and the spacer 4 for convenience of explanation, but actually, the separation membranes 2 and 3 and the spacer 4 are overlapped in a state such that there is no gap.

  Next, a plurality of microcapsules containing an adhesive are disposed between the pair of separation membranes 2 and 3. Specifically, a microcapsule is applied to either one of the separation membranes 2 and 3 (in FIG. 10, the separation membrane 3). Here, reference numeral 12 in FIG. 10 indicates a region where the microcapsules are arranged.

  Next, the pair of separation membranes 2 and 3 are pressurized from the outside by a pressure device 311 to crush the microcapsules, and the separation membranes 2 and 3 are joined to each other by an adhesive exposed from the microcapsules to form a bag-like separation. A membrane 1 is obtained. At this time, in the present embodiment, the pressing device 311 is pressed against the surface of one of the separation membranes 2 while being moved along the three sides of the separation membrane 2, thereby separating the separation membranes 2 and 3 from the outside. 311 is pressurized. Here, the arrows in FIG. 10 indicate the movement path of the pressurizing device 311.

  As described above, in this embodiment, the pair of separation membranes 2 and 3 are pressurized from the outside, and the microcapsules are crushed and the separation membranes 2 and 3 are joined to each other by the adhesive exposed from the microcapsules. A cylindrical separation membrane 301 is obtained. Since the adhesive of the microcapsule hardly spreads as compared with the adhesive having the conventional structure, the area of the joint portion between the separation membranes 2 and 3 can be managed relatively easily. Therefore, it can suppress that the permeation | transmission effective area of the separation membranes 2 and 3 reduces. In addition, since the microcapsule adhesive need not be solidified or dried, the manufacturing time of the bag-like separation membrane 301 can be shortened.

  In addition, as an example of pressurization while moving the pressurizing device 311 as pressurization between the pair of separation membranes 2 and 3, the pressurization of the separation membranes 2 and 3 is necessary without being limited thereto. You may pressurize the whole site | part at once with a pressurization board. Further, the pair of separation membranes 2 and 3 may be joined with an adhesive tape.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. 11 and FIG. In addition, the same code | symbol is provided to the same part as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The bag-like separation membrane 401 according to the present embodiment is different in that the areas of the pair of separation membranes 2 and 3 are different from each other, and the joining means 410 for joining the pair of separation membranes 2 and 3 is the bag-like shape of the first embodiment. Different from the separation membrane 1.

  In the present embodiment, one separation membrane 3 of the pair of separation membranes 2 and 3 has a larger area than the other separation membrane 2. Then, the separation membrane 3 having the larger area is bent, the separation membrane 2 having the smaller area is covered with the separation membrane 3 having the larger area, and the pair of separation membranes 2 and 3 in the covered portion are joined together. 410 is joined. Here, the two-dot chain line in FIG. 12 indicates the fold line of the separation membrane 3 having the larger area.

  As the joining means 410, the one described in the second embodiment, in which at least one of the separation membranes 2 and 3 is melted by heating, the separation membranes 2 and 3 are joined, or the third embodiment is described. In addition, an adhesive that breaks the microcapsule and is exposed from the microphone capsule is applied.

  As described above, in the bag-shaped separation membrane 401 of the present embodiment, one separation membrane 3 of the pair of separation membranes has a larger area than the other separation membrane 2 and has the larger area. And the separation membrane 2 with the larger area is covered with the separation membrane 2 with the smaller area, and the pair of separation membranes 2 and 3 in the covered portion are joined together. Accordingly, the entire area of the separation membrane 3 having a larger area on the side opposite to the separation membrane 2 side is a region through which water can permeate, so that the effective permeation area of the separation membrane 3 can be increased. .

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is provided to the same part as 2nd Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 13, the bag-like separation membrane 501 of the present embodiment is characterized in that a regulating portion 520 that regulates the joining range of the pair of separation membranes 2 and 3 is integrally connected to the edge of the spacer 4. It differs from the bag-like separation membrane 201 of the second embodiment.

  Moreover, in this embodiment, the fusion | melting part 4a which joins a pair of separation membranes 2 and 3 in the spacer 4 has comprised the protruding shape.

  The regulating portion 520 is located on the outer peripheral side of the melting portion 4a, and as shown in FIG. 14, the height thereof is lower than the height of the melting portion 4a before melting. Further, the melting temperature of the restricting portion 520 is higher than the melting temperature of the spacer 4.

  And the manufacturing method of the bag-shaped separation membrane 501 is similar to the second embodiment, wherein the melting portion 4a of the spacer 4 is heated and melted from the outside by the heating device 211, and the pair of separation membranes 2 and 3 are joined together. A bag-like separation membrane 501 is obtained. At this time, the melted portion 4a of the spacer 4 is melted and crushed by heating, whereby the distance between the pair of separation membranes 2 and 3 is narrowed. However, in this embodiment, the melted portion 4a is crushed by a specified amount. In the stage, the restricting portion 520 is sandwiched between the pair of separation membranes 2 and 3, and further approach between the separation membranes 2 and 3 is blocked by the restricting portion 520. Thereby, further crushing of the fusion | melting part 4a is also prevented by the control part 520, and the joining range of a pair of separation membranes 2 and 3 is controlled by the control part 520.

  As described above, in the present embodiment, the restricting portion 520 restricts the joining range of the pair of separation membranes 2 and 3, thereby making it easier to manage the area of the joining portion of the pair of separation membranes 2 and 3. It can be carried out. This also eliminates the need for special inspection of the area of the junction of the separation membranes 2 and 3 after joining the pair of separation membranes 2 and 3.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIG. 15 and FIG. In addition, the same code | symbol is provided to the same part as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The bag-like separation membrane 601 of this embodiment is different from the bag-like separation membrane 1 of the first embodiment in that a pair of separation membranes 2 and 3 are formed from a single material 630.

  The pair of separation membranes 2 and 3 is a facing portion of one material 630 that is folded in a zigzag manner, and a plurality of pairs (four sets in the drawing) of the pair of separation membranes 2 and 3 are provided. And the spacer 4 is inserted between the opposing parts (a pair of separation membranes 2 and 3) of one piece of raw material 630 which is folded in a zigzag manner. The joining means for joining the separation membranes 2 and 3 may be any joining means described in the above embodiments. However, in this embodiment, one of the three sides of the pair of separation membranes 2 and 3 that is the bottom of the bag is configured by the bent portion of the material 630 and is connected to each other in advance, so a separate joining means is used. There is no need to provide it. The bag-shaped separation membrane 601 having such a structure has a bag shape in which a plurality of bag portions 601a are formed.

  As described above, in the bag-shaped separation membrane 601 of the present embodiment, the pair of separation membranes 2 and 3 are opposed portions of one material 630 that is folded in a zigzag manner, and the pair of separation membranes 2 and 3 includes a plurality of separation membranes 2 and 3. A set is provided. Therefore, the bag-shaped separation membrane 601 having a plurality of bag portions 601a can be easily manufactured at low cost.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is provided to the same part as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 17, the bag-like separation membrane 601 of the present embodiment is first characterized in that a joining means 710 that joins a pair of separation membranes 2 and 3 is constituted by an adhesive 731 (see FIG. 18). It differs from the bag-shaped separation membrane 1 of the embodiment.

  A method for manufacturing the bag-like separation membrane 1 will be described. As shown in FIG. 18, first, a spacer 4 is inserted between a pair of separation membranes 2 and 3, and the pair of separation membranes 2 and 3 and the spacer 4 are overlapped. Note that FIG. 18 is a diagram in which there is a gap between the separation membranes 2 and 3 and the spacer 4 for convenience of explanation, but actually, the separation membranes 2 and 3 and the spacer 4 are overlapped in a state so that there is no gap.

  Next, the pair of separation membranes 2 and 3 and the spacer 4 that are overlapped with each other are immersed in a liquid adhesive 731 that is accommodated in a container 730 having an upper opening, and the pair of separation membranes 2 and 3 are formed by the adhesive 731. The bag-like separation membrane 701 is obtained by bonding. Specifically, after the three sides of the pair of separation membranes 2 and 3 and the spacer 4 that are overlapped with each other are sequentially immersed in the adhesive 731 in the container 730, the three sides of the pair of separation membranes 2 and 3 and the spacer 4 are impregnated. The adhesive 731 is dried. Thereby, the bag-shaped separation membrane 701 is obtained. Here, the liquid adhesive 731 can be easily infiltrated into the pair of separation membranes 2 and 3 and the spacer 4 by capillary action by adopting a relatively low viscosity.

  As described above, in this embodiment, the pair of separation membranes 2 and 3 and the spacer 4 that are overlapped with each other are immersed in the liquid adhesive 731, and the pair of separation membranes 2 and 3 are joined by the adhesive 731. Since the adhesive can be prevented from spreading by obtaining the bag-like separation membrane 701, the area of the joint portion between the pair of separation membranes 2 and 3 can be easily managed. Therefore, it can suppress that the permeation | transmission effective area of the separation membranes 2 and 3 reduces.

  Further, the bonding quality of the pair of separation membranes 2 and 3 is determined by the amount of the adhesive 731 impregnated in the pair of separation membranes 2 and 3, the time for immersing the pair of separation membranes 2 and 3 in the adhesive 731, It can be managed by temperature or the like, and the inspection of the bonding quality of the pair of separation membranes 2 and 3 can be made unnecessary.

  The present invention is not limited to the above-described embodiments, and various other embodiments can be adopted without departing from the gist of the present invention.

1,201,301,401,501,601 Bag-shaped separation membrane 2,3 Separation membrane 4 Spacer 5 Nipping member (joining means)
630 material

Claims (1)

A bag-shaped separation membrane manufacturing method for manufacturing a bag-shaped separation membrane comprising a pair of separation membranes and a spacer interposed between the pair of separation membranes,
One separation membrane of the pair of separation membranes has a larger area than the other separation membrane, and the larger separation membrane is folded and covered with the smaller separation membrane overlaid on the smaller separation membrane. A method for producing a bag-like separation membrane, comprising joining the separation membranes of the covered portion.

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