JPH10137559A - Spiral separation membrane element and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral separation membrane element with the fold precisely formed at the specified position of a separation membrane without being swolled and to furnish its producing method. SOLUTION: An adhesive tape 10 is stuck at the position of the fold of a separation membrane 2. A linear streak 13 is formed in the membrane 2 from above the tape 10 vertically to the rolling direction with a streaker. The membrane 2 is folded at the streak 13 with the tape 10 inside and an original liq. passage material in between. Otherwise, linear perforations are formed at the position of the fold of the membrane 2 vertically to the rolling direction with a perforator, the adhesive tape 10 is stuck on the perforations of the membrane 2, and the intermittent cur parts are selaed. The membrane 2 is folded at the perforations with the tape 10 inside and the original liq. passage material in between.

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.

The spiral-type separation membrane element 1 shown in FIG. 9 forms an envelope-like membrane (bag-like membrane) 4 by laminating a separation membrane 2 on both surfaces of a permeate flow path material 3 and bonding three sides. 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. 9, a stock solution 7 is supplied from one end face of a spiral 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.

For example, as shown in FIG. 10, the separation membrane 2 is folded at the center with the undiluted flow channel material 6 interposed therebetween to be folded in two. 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. Then, the two sides of each of the two separation membranes 2 to be back-to-back are bonded with an adhesive via the permeated liquid flow path material 3 and spirally wound around the outer peripheral surface of the water collecting pipe 5.

[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. Therefore, uneven displacement and wrinkles are likely to occur in the material group. The displacement or wrinkles of the material group gives a defect to the separation membrane, and if the displacement or wrinkles reaches the seal portion with the adhesive, the sealing becomes 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 order to prevent such a shift or wrinkles, first, it is necessary to fold the separation membrane exactly at right angles to the winding direction. When the separation membrane is folded, a defect occurs in the separation membrane at the fold. Therefore, the separation membrane is protected by applying an adhesive tape to the fold so that liquid does not pass through the defect. In that state, in order to fold the separation membrane at a right angle, fold the separation membrane and hand the folded part by hand,
A method of forming a fold by pressing with a plate, a roller, or the like has been performed.

However, since the width of the separation membrane is usually as long as about 1 meter, this method has a problem that the linearity of the fold and the accuracy of the squareness are poor. In addition, since the position of the fold of the separation membrane is determined by the length of the folded portion, it is difficult to form the fold at a predetermined position of the separation membrane with sufficiently high accuracy. As a result, as shown in FIG. 11, the fold line 12 is not exactly perpendicular to the winding direction A, and the folded separation membrane 2 is shifted.

In addition, since bulges remain at the folds of the separation membrane, the separation membrane is bulky when a plurality of separation membranes are stacked, the dimensional accuracy of the stacking position is reduced, and a shift occurs when the material group is wound, resulting in a defect. There is also a problem.

An object of the present invention is to provide a spiral-type separation membrane element accurately formed without a fold swelling at a predetermined position of the separation membrane, and a method of 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. 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, and a groove-like streak is formed at the fold position of the separation membrane. It is.

[0013] Thereby, the separation membrane is accurately and easily folded at the streaks formed at predetermined positions, and the fold of the separation membrane does not bulge, so that it is wound around the outer peripheral surface of the perforated hollow tube. There is no shift or wrinkles in the material group. Therefore, no defect occurs in the separation membrane, and good separation performance can be obtained.

A spiral separation membrane element according to a second aspect of the present invention provides a sheet-like separation membrane and a permeate flow path material which are folded with a stock solution flow path material therebetween, as one set of material group, and one or more sets of material. In a spiral-type separation membrane element formed by superimposing groups and winding them around the outer peripheral surface of a perforated hollow tube, an intermittent cut is formed at the fold position of the separation membrane, and a band-shaped tape is placed on the cut of the separation membrane. It is attached.

Thus, the separation membrane is accurately and easily folded at the cut formed at a predetermined position, and the fold of the separation membrane does not swell, so that the separation membrane is wound around the outer peripheral surface of the perforated hollow tube. There is no shift or wrinkles in the material group. Therefore, no defect occurs in the separation membrane, and good separation performance can be obtained.

[0016] In a third aspect of the 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 for 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, after forming a groove-shaped streak at a predetermined position of the separation membrane, This is to fold the separation membrane along the lines.

Thus, the separation membrane can be folded accurately and easily at the streaks formed at predetermined positions, and since no bulge occurs at the fold portion of the separation membrane, one or a plurality of material groups can be formed. When the material group is wound around the outer peripheral surface of the perforated hollow tube while being adhered with an adhesive, no deviation or wrinkling occurs in the material group.
Therefore, it becomes possible to manufacture a spiral-type separation membrane element having no defect in the separation membrane.

A method for manufacturing a spiral separation membrane element according to a fourth aspect of the present invention is a method of manufacturing a spiral 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 interposed therebetween are 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 around the outer peripheral surface of a perforated hollow tube, an intermittent cut is formed at a predetermined position of the separation membrane, and separation is performed. After sticking a strip-shaped tape on the cut of the membrane, the separation membrane is folded at the cut.

Thus, the separation membrane can be accurately and easily folded at a cut formed at a predetermined position, and since no bulge occurs at the fold portion of the separation membrane, one or a plurality of material groups can be formed. When wound around the outer peripheral surface of the perforated hollow tube while bonding with an adhesive, the separation membrane does not shift or wrinkle. Therefore, it becomes possible to manufacture a spiral-type separation membrane element having no defect in the separation membrane.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are schematic views showing an example of a method for folding a separation membrane in a method for manufacturing a spiral type separation membrane element according to the present invention.
2 (a) is a front view, and FIGS. 1 (b) and 2
(B) is a plan view.

First, as shown in FIG. 1, an adhesive tape 10 is attached to a predetermined bending position of the separation membrane 2, and the adhesive tape 10 is wound around the separation membrane 2 from above the adhesive tape 10 by using a scoring device. Form a linear streak. A straight ridge 11a is provided on the upper mold 11 of the creaser,
The lower mold 12 is provided with a linear groove 12a.

As a result, as shown in FIG. 2, a linear line 13 perpendicular to the winding direction A is formed at the center of the adhesive tape 10 and the separation membrane 2. Then, the separation membrane 2 is folded at the streaks 13 with the adhesive tape 10 inside and the stock solution flow path material 6 (see FIG. 7) interposed therebetween.

1 and 2, a plurality of separation membranes 2
As shown in FIG. 7, a permeate flow path material 3 is inserted between a plurality of separation membranes 2 and overlapped with each other.
Are wound spirally around the outer peripheral surface of the water collecting tube 5 while bonding three sides of each of the two separation membranes to be back-to-back via an adhesive.

FIGS. 3 and 4 are schematic views showing another example of a method of folding a separation membrane in the method of manufacturing a spiral type separation membrane element according to the present invention. FIGS. 3 (a) and 4 (a) are schematic views. FIGS. 3B and 4B are plan views.

First, as shown in FIG. 3, a linear perforation 16 perpendicular to the winding direction A is formed at a predetermined bending position of the separation membrane 2 using a perforation device.
The perforation device has an upper mold 14 and a lower mold 15, and the upper mold 14 has, as shown in FIG.
4a. As a result, perforations 16 formed of intermittent cuts (broken or dotted cuts) are formed.

Next, as shown in FIG. 4, an adhesive tape 10 is stuck on the perforations 16 of the separation membrane 2 to seal the intermittent cut portion. Then, the separation membrane 2 is perforated with the undiluted liquid flow path material 6 (see FIG. 7) with the adhesive tape 10 inside.
Fold in 6.

A plurality of separation membranes 2 are formed by the method shown in FIGS.
As shown in FIG. 7, a permeate flow path material 3 is inserted between a plurality of separation membranes 2 and overlapped with each other.
Are wound spirally around the outer peripheral surface of the water collecting tube 5 while bonding three sides of each of the two separation membranes to be back-to-back with an adhesive.

FIG. 8 is a schematic view showing another example of the method for producing a spiral type separation membrane element according to the present invention. A plurality of lines 13 perpendicular to the winding direction are formed on the long separation membrane 2 by the method of FIGS. 1 and 2 or a plurality of lines 13 perpendicular to the winding direction by the method of FIGS. And the separation membrane 2 is separated from the
Fold alternately at 3 or perforations 16 in the opposite direction. 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.

Thereafter, the folded separation membrane 2 is bonded to the two sides on both sides of the separation membrane 2 facing each other via the permeate flow path material 3 with an adhesive, and the folded separation membrane 2 is separated from 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, it is possible to accurately form the fold at the predetermined position of the separation membrane 2 without expanding the fold, and to obtain an excellent spiral type separation membrane element having no defect. It can be manufactured.

[0031]

【Example】

[Example 1] An adhesive tape 10 is applied to the center of the separation membrane 2 perpendicularly to the winding direction A, and a linear streak is formed at the center of the adhesive tape 10 perpendicular to the winding direction A using a creaser. 13 was formed. The separation membrane 2 was bent at the streaks 13 with the undiluted liquid flow path material 6 interposed therebetween to be folded in two. At this time, as shown in FIG. 6, it was confirmed that the separation membrane 2 was correctly folded without swelling along the streaks 13 perpendicular to the winding direction A.

The permeated liquid channel material 3 was superimposed on the thus separated separation membrane 2 to form a set of leaves, and 30 leafs were produced and superposed. A spiral separation membrane element was manufactured by spirally winding the three sides of each of the two separation membranes 2 to be back-to-back via the permeated liquid flow path material 3 around the outer peripheral surface of the water collecting pipe 5 while bonding the three sides with urethane resin.

In the spiral-type separation membrane element manufactured in this manner, the material group wound around the water collecting pipe 5 did not generate any shift or wrinkle, and a predetermined performance was obtained.

Example 2 A straight perforation 16 perpendicular to the winding direction A was formed at the center of the separation membrane 2 using a perforation device. The adhesive tape 10 was applied on the perforations 16 of the separation membrane 2, and the intermittent cut portions were sealed. The separation membrane 2 was bent at the perforations 16 with the undiluted liquid flow path material 6 interposed therebetween to be folded in two. At this time, as shown in FIG. 6, it was confirmed that the separation membrane 2 was correctly folded without expanding along the perforations 16 perpendicular to the winding direction A.

The permeated liquid channel material 3 was superimposed on the separation membrane 2 thus folded to form a set of leaves, and 30 leafs were produced and superposed. A spiral separation membrane element was manufactured by spirally winding the three sides of each of the two separation membranes 2 to be back-to-back via the permeated liquid flow path material 3 around the outer peripheral surface of the water collecting pipe 5 while bonding the three sides with urethane resin.

In the spiral-type separation membrane element manufactured as described above, the material group wound around the water collecting pipe 5 did not have any displacement or wrinkles, and a predetermined performance was obtained.

[Brief description of the drawings]

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

FIG. 2 is a schematic view showing one example of a method for folding a separation membrane in 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 of folding a separation membrane in a method of manufacturing a spiral separation membrane element according to the present invention.

FIG. 4 is a schematic view showing another example of a method for folding a separation membrane in a method for manufacturing a spiral separation membrane element according to the present invention.

FIG. 5 is a diagram showing teeth of a perforation device used in the folding method of FIG. 3;

FIG. 6 is a view showing a separation membrane folded by the method of FIGS. 1 and 2 or the method of FIGS. 3 and 4;

FIG. 7 is a schematic view showing an example of a method for producing a spiral separation membrane element according to the present invention.

FIG. 8 is a schematic view showing another example of the method for producing a spiral separation membrane element according to the present invention.

FIG. 9 is a partially cutaway perspective view of a spiral separation membrane element.

FIG. 10 is a schematic diagram showing a state in which a plurality of separation membranes are stacked by a conventional method for manufacturing a spiral type separation membrane element.

FIG. 11 is a view showing a separation membrane folded by a conventional method for manufacturing a spiral-type separation membrane element.

[Explanation of symbols]

 2 Separation membrane 3 Permeated liquid flow path material 5 Water collecting pipe 6 Raw liquid flow path material 7 Raw liquid 8 Permeated liquid 9 Concentrated liquid 10 Adhesive tape 11,14 Upper mold 12,15 Lower mold 11a Ridge 12a Groove 13 Straight line 14a Tooth 16 Perforation

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Katsumori Nakura 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation

Claims (4)

[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 separation membrane element wound around an outer peripheral surface, wherein a groove-like streak is formed at a fold position of the separation membrane. 2. A sheet-shaped separation membrane and a permeated liquid flow path material which are folded over a raw liquid flow path material to form a set of material groups, and one or a plurality of material groups are overlapped to form a perforated hollow tube. In a spiral-type separation membrane element wound around an outer peripheral surface, an intermittent cut is formed at a fold position of the separation membrane, and a strip-shaped tape is stuck on the cut of the separation membrane. Type separation membrane element. 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. In the method for manufacturing a spiral separation membrane element wound around an outer peripheral surface, after forming a groove-shaped streak at a predetermined position of the separation membrane, the separation membrane is folded at the streak, Element manufacturing method. 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 for producing a spiral-type separation membrane element wound around an outer peripheral surface, an intermittent cut is formed at a predetermined position of the separation membrane, and a band-shaped tape is adhered on the cut of the separation membrane. A method for producing a spiral-type separation membrane element, comprising folding a membrane at the cut.