JPH10137558A - Spiral separation membrane element and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral separation membrane element without any defect at the part where rolling of the separation membrane is started and to furnish its producing method. SOLUTION: An adhesive tape 10 is stuck in the center of a separation membrane 2, and an original liq. passage 6 is arranged at a specified distance from the center line of the tape 10. The membrane 2 is folded at the center line of the tape 10 with the tape inside. The opposed parts at a specified width from the fold 12 of the membrane 2 are hot-pressed on each other with a hot plate 11, or an adhesive is applied in the center of the tape 10 and the opposed parts at a specified width from the fold 12 of the membrane 2 are joined together with an adhesive 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spiral separation membrane element for separating components of a fluid by a reverse osmosis technique, a filtration technique or the like using a separation membrane and a method for producing the same.

[0002]

2. Description of the Related Art Spiral type separation membrane elements are used in membrane separation devices such as reverse osmosis membrane separation devices, ultrafiltration devices and microfiltration devices for separating fluid components. FIG.
FIG. 2 is a partially cutaway perspective view of a spiral separation membrane element.

A spiral-type separation membrane element 1 shown in FIG. 4 forms an envelope-like membrane (bag-like membrane) 4 by laminating a separation membrane 2 on both sides of a permeate flow path material 3 and bonding three sides thereof. By attaching the opening of the envelope-shaped membrane 4 to the water collecting pipe 5 formed of a perforated hollow pipe, and winding it spirally around the outer peripheral surface of the water collecting pipe 5 together with the net-shaped (net-shaped) raw liquid flow path material 6. Be composed.

As shown in FIG. 4, a stock solution 7 is supplied from one end face of a spiral type separation membrane element 1. The supplied undiluted solution 7 flows along the undiluted solution flow path member 6, and is discharged as the concentrated solution 9 from the other end surface side of the spiral separation membrane element 1. In the course of the undiluted solution 7 flowing along the undiluted flow path material 6, the permeated liquid 8 that has passed through the separation membrane 2 flows into the water collecting pipe 5 along the permeated liquid flow path material 3, and is discharged from the end of the water collecting pipe 5. You.

[0005] In manufacturing the spiral-type separation membrane element as described above, the separation membrane is folded with the stock solution channel material interposed therebetween, and the folded separation membrane and the permeated solution channel material are combined into a set of material groups (leaves). Then, one or a plurality of material groups are superimposed and spirally wound around the outer peripheral surface of the water collecting pipe while sealing with an adhesive.

[0006] For example, as shown in FIG.
And the separation membrane 2 is folded at the center to make it into two folds. A plurality of the separation membranes 2 thus folded are produced, and the permeated liquid flow path material 3 is inserted therebetween to overlap the plurality of the separation membranes 2. 2 to be back-to-back through the permeated liquid flow path material 3
As shown in FIG. 6, the three sides of the separation membrane 2 are spirally wound around the outer peripheral surface of the water collecting pipe 5 while being bonded with an adhesive.

[0007]

As described above, the spiral-type separation membrane element is manufactured by spirally winding a group of materials having different thicknesses, shapes and materials around a water collecting pipe while sealing with an adhesive. . When a portion not filled with the adhesive occurs, the sealing is incomplete, and the stock solution flows into the permeate side without passing through the separation membrane. Thereby, the performance of the separation membrane element is significantly impaired.

In particular, the fold at the winding start side of the separation membrane becomes thicker by the thickness of the separation membrane, so that an unfilled portion of the adhesive is likely to occur. In addition, a net-shaped raw liquid flow path material is sandwiched between the folded separation membranes to secure a space for flowing the raw liquid. Usually, the thickness of the stock solution channel material is about 5 times the thickness of the separation membrane. Due to this stock solution flow path material, an unfilled portion of the adhesive is likely to occur at the fold portion of the separation membrane.

Usually, when the separation membrane is folded, a defect occurs in the separation membrane at the fold. Therefore, a polyester adhesive tape or the like is attached to the fold so that liquid does not permeate from the defect, and the separation membrane is folded in that state. Is being done.
However, when the separation membrane to which the adhesive tape is adhered is folded, the fold swells due to the repulsive force of the separation membrane and the adhesive tape.

Although swelling is removed by squeezing the separation membrane with a hand, plate, roller, or the like, it is difficult to completely remove all swelling, and some swelling remains. . For this reason, there is a problem that the difference in the thickness of the winding start portion becomes larger for each separation membrane, and the above-mentioned unfilled portion of the adhesive occurs. In addition, when a large number of material groups are overlapped with each other before being wound around the water collecting pipe, there is a problem that the material groups are likely to shift due to bulging of the fold portion of the separation membrane as shown in FIG. . Further, as shown in FIG. 6, when a large number of material groups are wound around the water collection pipe,
The space 20 at the beginning of winding of each separation membrane becomes large. As a result, defects occur at the beginning of winding of the separation membrane, and the performance of the spiral separation membrane element is reduced.

An object of the present invention is to provide a spiral-type separation membrane element in which a defect does not occur in a winding start portion of the separation membrane, and a method for manufacturing the same.

[0012]

Means for Solving the Problems and Effects of the Invention The spiral type separation membrane element according to the first invention comprises a sheet-like separation membrane folded over a stock solution flow path material and a permeate flow path material as a set of materials. In a spiral-type separation membrane element in which one or a plurality of material groups are overlapped and wound on the outer peripheral surface of a perforated inner space, opposing portions having a predetermined width from a fold on the winding start side of the separation membrane are mutually joined. It was crimped on.

As a result, the fold portion on the winding start side of the separation membrane is flattened, so that one or more material groups wound around the outer peripheral surface of the perforated hollow tube are not filled with the adhesive. No portion is generated, and no displacement of the material group occurs. Therefore,
No defect occurs at the winding start portion of the separation membrane, and good separation performance is obtained.

In particular, 5 folds from the fold on the winding start side of the separation membrane
It is preferable that opposing portions having a width of not less than 20 mm or less be pressure-bonded to each other. This prevents the occurrence of defects at the beginning of winding of the separation membrane without lowering the volume efficiency of the separation membrane.

A spiral separation membrane element according to a second aspect of the present invention comprises a sheet-like separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween, and forms one or more sets of material groups. In a spiral-type separation membrane element formed by superposing groups and winding the outer circumference of a perforated hollow tube, opposing portions having a predetermined width from a fold at a winding start side of the separation membrane are joined to each other with an adhesive. .

As a result, the fold portion on the winding start side of the separation membrane is flattened, so that one or more material groups wound around the outer peripheral surface of the perforated hollow tube are not filled with the adhesive. No portion is generated, and no displacement of the material group occurs. Therefore,
No defect occurs at the winding start portion of the separation membrane, and good separation performance is obtained.

In particular, from the fold at the winding start side of the separation membrane,
It is preferred that the opposing portions having a width of at least 20 mm or less be joined to each other with an adhesive. This prevents the occurrence of defects at the beginning of winding of the separation membrane without lowering the volume efficiency of the separation membrane.

A spiral separation membrane element according to a third aspect of the present invention comprises a sheet-like separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween, and forms one or more sets of material groups. In a spiral-type separation membrane element in which groups are overlapped and wound on the outer peripheral surface of a perforated hollow tube, a stock solution flow path material is arranged so as to be separated from a fold at a winding start side of the separation membrane by a predetermined distance.

Since the raw material flow path material does not exist inside the vicinity of the fold on the winding start side of the separation membrane, an unfilled portion of the adhesive does not occur near the fold of the separation membrane. Therefore, no defect occurs at the winding start portion of the separation membrane, and good separation performance can be obtained.

In particular, it is preferable to arrange the stock solution flow path material at a distance of 5 mm or more and 20 mm or less from the fold on the winding start side. As a result, the occurrence of defects at the beginning of winding of the separation membrane is prevented while the flow space of the stock solution is sufficiently ensured.

A method for manufacturing a spiral-type separation membrane element according to a fourth aspect of the present invention is a method for manufacturing a spiral-type separation membrane element, wherein a sheet-like separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween,
In a method for manufacturing a spiral-type separation membrane element in which one or a plurality of material groups are overlapped and wound on the outer peripheral surface of a perforated hollow tube, after separating the separation membrane across a raw liquid flow path material, the separation membrane Are heated and pressure-bonded to each other at a predetermined width from the fold at the winding start side of the winding.

As a result, the swelling at the fold portion on the winding start side of the separation membrane is removed, so that one or a plurality of material groups are wound around the outer peripheral surface of the perforated hollow tube while being bonded with an adhesive. In this case, the unfilled portion of the adhesive does not occur, and the material group does not shift. Therefore, it is possible to manufacture a spiral-type separation membrane element having no defect in the winding start portion of the separation membrane.

In a fifth aspect of the present invention, there is provided a method for manufacturing a spiral-type separation membrane element, wherein a sheet-like separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween are provided as a set of material groups,
In a method of manufacturing a spiral-type separation membrane element in which one or a plurality of material groups are superimposed and wound on the outer peripheral surface of a perforated hollow tube, when the separation membrane is folded across a raw liquid flow path material, the separation membrane Are joined to each other with an adhesive at a predetermined width from the fold on the winding start side of the winding.

[0024] This removes the bulge in the fold at the winding start side of the separation membrane, so that one or a plurality of material groups can be wound around the outer peripheral surface of the perforated hollow tube while being bonded with an adhesive. In addition, no unfilled portion of the adhesive is generated, and no displacement of the material group occurs. Therefore, it is possible to manufacture a spiral-type separation membrane element having no defect in the winding start portion of the separation membrane.

The method for manufacturing a spiral separation membrane element according to a sixth aspect of the present invention provides a sheet-type separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween, as a set of material groups.
In a method of manufacturing a spiral separation membrane element in which one or a plurality of material groups are overlapped and wound on the outer peripheral surface of a perforated hollow tube, a raw solution flow path material is separated from a fold at a winding start side of a separation membrane by a predetermined distance. They are to be placed apart.

[0026] As a result, since there is no stock solution flow path material inside the vicinity of the fold on the winding start side of the separation membrane, no unfilled portion of the adhesive is generated near the fold of the separation membrane. Therefore, it is possible to manufacture a spiral-type separation membrane element having no defect in the winding start portion of the separation membrane.

[0027]

1 and 2 are schematic views showing one example of a method for manufacturing a spiral type separation membrane element according to the present invention.

First, as shown in FIG.
The adhesive tape 10 having a width L1 is stuck to the center of the adhesive tape 10, and the undiluted liquid channel material 6 is arranged at a distance L2 from the center line P of the adhesive tape 10. The width L1 of the adhesive tape 10 is, for example, 40 to 60 mm.
And the interval L2 is 5 to 20 mm.

Next, as shown in FIGS. 1B and 1C,
With the adhesive tape 10 inside, the separation membrane 2 is
At the center line P. Then, the fold 12 of the separation membrane 2
Is heated and pressed with a hot plate 11. here,
The width L3 is 5 to 20 mm.

Alternatively, in the step of FIG. 1A, an adhesive is applied to a predetermined width at the center of the pressure-sensitive adhesive tape 10 and the
As shown in (2), a portion having a width L4 from the fold 12 of the separation membrane 2 is joined with an adhesive 13. Here, the width L4 is 5 to 20 m.
m. By these methods, the fold 12 of the separation membrane 2 is formed.
Is flattened to completely eliminate the bulge.

A plurality of separation membranes 2 are manufactured by the method shown in FIG.
As shown in FIG. 2, the permeated liquid flow path material 3 is inserted between a plurality of separation membranes 2 and overlapped with each other. A spiral is wound around the outer peripheral surface of the water collecting pipe 5 while the sides are adhered with an adhesive.

FIG. 3 is a schematic view showing another example of a method for manufacturing a spiral separation membrane element according to the present invention. The long separation membranes 2 are alternately folded in opposite directions. The stock solution channel material 6 and the permeate solution channel material 3 are alternately sandwiched between the folded separation membranes 2. The fold 12 of the separation membrane 2 in which the undiluted liquid channel material 6 is sandwiched becomes a fold on the winding start side of the water collecting pipe 5.
At this time, the fold 12 on the winding start side is formed by the method shown in FIG.
The bulge of the part is completely removed.

Then, the separation membrane 2 folded while adhering the two sides on both sides of the separation membrane 2 facing each other via the permeate flow path material 3 to the raw liquid flow path material 6 and the permeate flow path material 3 At the same time, it is spirally wound from the fold 12 to the outer peripheral surface of the water collecting pipe 5.

As described above, by using the manufacturing method according to the present invention, the thickness of the fold 12 on the winding start side of the separation film 2 can be minimized, and the winding start portion of the separation film 2 has a defect. It becomes possible to manufacture an excellent spiral type separation membrane element without any.

[0035]

EXAMPLE An adhesive tape 10 was applied to the center of a separation membrane 2 having a width of 1 m and a length of 1.4 m, and a net-shaped stock solution flow path material 6 was temporarily fixed at a position 10 mm away from the center line of the adhesive tape 10. . The separation membrane 2 was folded at the center line of the adhesive tape 10 to be folded in two. Crease 12 on the winding start side of separation membrane 2
Is sandwiched between hot plates 11 at 150 ° C.
The mm part was flattened.

The separation membrane 2 folded in this manner is
One sheet was prepared, and the permeated liquid flow path material 3 was inserted between the sheets and superposed. The water collecting pipe 5 is bonded to the three sides of the two separation membranes 2 to be back-to-back with the urethane resin via the permeated liquid flow path material 3.
Was spirally wound around the outer peripheral surface of to produce a spiral-type separation membrane element.

In the spiral-type separation membrane element manufactured as described above, no defect occurred at the start of winding of the separation membrane 2 around the water collecting pipe 5.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a method for manufacturing a spiral separation membrane element according to the present invention.

FIG. 2 is a schematic view illustrating an example of a method for manufacturing a spiral separation membrane element according to the present invention.

FIG. 3 is a schematic view showing another example of a method for producing a spiral separation membrane element according to the present invention.

FIG. 4 is a partially cutaway perspective view of a spiral separation membrane element.

FIG. 5 is a schematic diagram showing a state in which a plurality of separation membranes are stacked by a conventional method of manufacturing a spiral separation membrane element.

FIG. 6 is a schematic diagram showing a state in which a plurality of separation membranes are wound around a water collecting pipe by a conventional method for manufacturing a spiral separation membrane element.

[Explanation of symbols]

 2 Separation membrane 3 Permeate liquid flow path material 5 Water collecting pipe 6 Raw liquid flow path material 7 Raw liquid 8 Permeate 9 Concentrate 10 Adhesive tape 11 Hot plate 12 Fold

Claims (6)

[Claims] 1. A sheet-like separation membrane and a permeate flow path material which are folded over a raw liquid flow path material as a set of material groups, and one or a plurality of material groups are overlapped to form a perforated hollow tube. A spiral-type separation membrane element wound around an outer peripheral surface, wherein opposing portions having a predetermined width are crimped to each other from a fold on a winding start side of the separation membrane. 2. A perforated hollow tube formed by laminating a sheet-like separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween, and laminating one or more sets of material groups. A spiral-type separation membrane element wound around an outer peripheral surface of a spiral-type separation membrane element, wherein opposing portions having a predetermined width from a fold at a winding start side of the separation membrane are joined to each other with an adhesive. 3. A sheet-shaped separation membrane and a permeated liquid flow path material which are folded over a raw liquid flow path material as a set of material groups, and one or a plurality of material groups are overlapped to form a perforated hollow tube. A spiral-type separation membrane element wound around an outer peripheral surface, wherein the stock solution flow path material is arranged at a predetermined distance from a fold at a winding start side of the separation membrane. 4. A sheet-shaped separation membrane and a permeated liquid flow path material which are folded over a raw liquid flow path material as a set of material groups, and one or more sets of material groups are overlapped to form a perforated hollow tube. In the method of manufacturing a spiral-type separation membrane element wound around an outer peripheral surface, after folding the separation membrane across the stock solution flow path material, mutually opposing portions of a predetermined width from a fold on a winding start side of the separation membrane are mutually connected. A method for producing a spiral-type separation membrane element, which comprises performing thermocompression bonding. 5. A sheet-like separation membrane and a permeate flow path material which are folded over a raw liquid flow path material as a set of material groups, and one or a plurality of material groups are overlapped to form a perforated hollow tube. In the method for manufacturing a spiral-type separation membrane element wound around an outer peripheral surface, when the separation membrane is folded with the stock solution flow path material interposed therebetween, an opposing portion having a predetermined width from a fold on a winding start side of the separation membrane is bonded with an adhesive. A method for producing a spiral-type separation membrane element, characterized in that the elements are joined to each other by a method described above. 6. A sheet-like separation membrane and a permeate flow path material which are folded over a raw liquid flow path material as a set of material groups, and one or a plurality of material groups are overlapped to form a perforated hollow tube. A method for manufacturing a spiral separation membrane element wound around an outer peripheral surface, wherein the stock solution flow path material is arranged at a predetermined distance from a fold on a winding start side of the separation membrane, and is manufactured. Method.