JP2003275545A - Spiral type membrane element and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spiral type membrane element in which the need of the applying process of an adhesive material and the standby time of hardening for forming a both end sealing part for sealing both end parts of a membrane is eliminated and stable manufacture is efficiently performed, and the manufac turing method. <P>SOLUTION: In the spiral type membrane element, a laminated body in which a supply side flow path material 2 is interposed on the supply side of an opposing membrane 1 and a transmission side flow path material 4 is interposed on the transmission side of the opposing membrane 1 is wound around a perforated hollow pipe 5 in a spiral shape and sealing structures A1 and A2 for not directly communicating a supply side flow path and a transmission side flow path are provided. The both end sealing part A1 for sealing both end parts of the membrane 1 of the sealing structures is sealed with a hot-melt material interposed in the opposing membrane 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a separation operation for separating a specific component existing in various fluids (liquid or gas), or a gas-liquid contact operation such as gas dissolution into a liquid or gas release from a liquid. The present invention relates to a spiral wound type membrane element and a method for producing the same. More specifically, the present invention relates to improvement of both-ends sealing portions that seal both ends of the membrane (both ends in the width direction of the membrane along the hollow tube).

[0002]

2. Description of the Related Art The conventional spiral wound type membrane element has two
A set of laminated bodies (membrane leaves) in which three sides are sealed in a bag shape with a permeation side flow path material interposed on the permeation side of a single membrane is connected to a perforated hollow tube, and the connected lamination is A structure has been known in which a supply-side flow path material is interposed and spirally wound. Also,
It is also known to use a plurality of laminated bodies (membrane leaves) in order to shorten the flow path length on the permeation side.

As the latter basic structure, a laminated body having a supply side channel material on the supply side of the opposing membrane and a permeation side channel material on the permeation side of the opposing membrane is used as a perforated hollow body. It is generally wound around a pipe in a spiral shape, and is generally provided with a sealing structure for preventing direct communication between the supply-side flow passage and the permeation-side flow passage. More specifically, a single or a plurality of laminates of a membrane material group consisting of a bi-folded membrane leaf sandwiching the supply side channel material on the separation layer side of the membrane and a permeation side channel material adjacent thereto are provided. It is already known to wind a hollow tube around a hole (for example, US Pat. No. 3,417,870).

In such a spiral wound type membrane element, the both-end sealing portion A1 for sealing both ends of the membrane 1 as shown in FIG. 4 is important as the above-mentioned sealing structure. As a method of manufacturing a spiral wound type membrane element having such a both end sealing portion A1, those shown in FIGS. 5 (a) to 5 (c) are known.

First, a membrane leaf 3 composed of a membrane 1 and a supply-side channel material 2 is prepared, and a permeation-side channel material 4 is arranged in an overlapping manner. Adhesive a for sealing is applied to both ends of the membrane 1 of the membrane leaf 3.
After 1 is applied, the laminate is manufactured by shifting the same at regular intervals (the outer peripheral length of the hollow tube 5 divided by the number of the membrane leaves 3). Using the permeation-side channel material 4 previously adhered to the hollow tube 5, this laminated body is wound around the hollow tube 5, and the applied adhesive is naturally cured over time at room temperature. The element can be manufactured. Note that FIG.
Exemplifies a form in which the membrane leaves 3 are not continuous independently (single leaf), but a form in which the membranes 1 of the respective membrane leaves 3 are continuous is also known.

[0006]

However, in such a conventional method for producing a spiral wound type membrane element,
There were various problems as follows. That is, (1) a coating step for coating a fluid adhesive is required, which requires working time, (2) production time is restricted due to the pot life of the adhesive, and (3) winding Since it takes several tens of hours until the adhesive is completely cured later, a long waiting time is required before moving to the next step. (4) Since the adhesive is applied to the member, slippage during winding is bad. Wrinkles are likely to occur in the member, (5) because of the fluidity, the adhesive width is not constant and the film area is not stable, (6) there is adhesive protrusion or spread, and There are problems such as the industrial waste of adhesives.

Therefore, an object of the present invention is to eliminate the need for an adhesive application step for forming the both-ends sealing portions for sealing the both ends of the film and the waiting time for curing, and to achieve stable production efficiently. It is an object of the present invention to provide a spiral-type membrane element that can be performed and a method for producing the same.

[0008]

The above object can be achieved by the present invention as described below. That is, the spiral wound type membrane element of the present invention has a laminated body in which a supply-side channel material is interposed on the supply side of the opposing membrane and a permeation-side channel material is interposed on the permeate side of the opposing membrane. In a spiral wound type membrane element, which is spirally wound around an empty tube, and has a sealing structure for the supply side flow passage and the permeation side flow passage not directly communicating with each other,
In the above-mentioned sealing structure, both end sealing portions for sealing both end portions of the film are sealed with a heat-fusible material interposed in the facing film.

On the other hand, in the method for manufacturing the spiral wound type membrane element of the present invention, the supply side channel material is interposed between the opposing membrane supply sides, and the permeate side channel material is interposed between the opposite membrane permeation sides. Forming a laminate having a heat-fusible material interposed at both ends of the permeation side or the supply side of the membrane, winding the laminate around a perforated hollow tube, and performing the heat fusion. Of sealing both ends of the membrane by fusing a conductive material and forming both ends of the membrane, and forming another sealing structure for preventing direct communication between the supply-side flow passage and the permeation-side flow passage And having. Here, the step of forming another sealing structure refers to a step of sealing the sealing part around the hollow tube, and this step may be performed at any stage.

In the above, when the heat-fusible material is interposed between the both ends of the film, it is preferable that the heat-fusible sheet is temporarily attached or an adhesive tape having a heat-fusible layer is attached. .

[Operation and Effect] According to the spiral wound type membrane element of the present invention, the both-ends sealing portions for sealing both ends of the membrane in the above-mentioned sealing structure are sealed by the heat-fusible material interposed in the opposing membranes. Since it is stopped, the following effects are obtained as compared with the case of using an adhesive.

(1) The application process of the adhesive can be eliminated, the working time can be greatly reduced, and the productivity can be improved. (2) The pot life of the adhesive does not occur, and the production time is limited. (3) The curing time of the adhesive is significantly reduced, which eliminates the waiting time until the next step and greatly contributes to the lead time.

(4) The protrusion of the adhesive can be reduced, the edge of each member can be controlled, and the industrial waste of the protruding portion can be eliminated. Further, the step of cutting the edge can be eliminated.

On the other hand, according to the manufacturing method of the present invention, since the heat-fusible material interposed between the opposite ends of the film is fused to form the both-end sealing part for sealing the both ends of the film, The effects (1) to (4) described above can be obtained.

Further, when the heat-fusible material is interposed between the both ends of the film, when the heat-fusible sheet is temporarily attached or the adhesive tape having the heat-fusible layer is attached (5 ) Dry heat-sealing tape or sheet improves slidability and eliminates wrinkles, (6) Adhesive width becomes constant,
It is possible to obtain effects such as stabilization of the membrane area and maximization of the membrane area.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 (a) to 3
(B) is a process drawing which shows typically an example of the manufacturing method of the spiral type membrane element of this invention. First, the manufacturing method of the present invention will be described.

The manufacturing method of the present invention is shown in FIGS.
As shown in, there is a step of winding the laminated body S2 around the perforated hollow tube 5. In the present embodiment, as shown in FIG. 1A, the elastic body 6 is arranged in advance at a position where the sealing portion A2 around the hollow tube 5 is formed, and sealing is performed around the hollow tube 5. Part A2
An example of forming the is shown. The formation position of the sealing portion A2 is determined according to the width of the film 1, and is preferably near the position where the both-end sealing portions of the film 1 are arranged.

As the hollow tube 5, any conventionally known tube can be used, for example, a hollow tube having a hole made of metal, fiber reinforced plastic, plastic or ceramics. Regarding the shape, size, position, number, etc. of the holes 5a, any conventionally known one can be adopted depending on the kind of the film. However, in order to improve the adhesiveness with the elastic body 6, fiber reinforced plastic or plastic is preferable.

Examples of the material constituting the elastic body 6 include a thermoplastic elastomer, a thermoplastic resin, or a partially cured product of a thermosetting resin, a partially crosslinked product of rubber, or a foam thereof, and the like. Those containing a resin foam are preferred. In particular, it is preferable to arrange the elastic body 6 by winding it around the hollow tube 5 using an adhesive tape (including a double-sided tape) having a thermoplastic resin foam as a base material. 10 to 500K when using adhesive tape
It is preferable to wind at a pressure of Pa for 1 to several tens of times. As the adhesive for the adhesive tape, any of acrylic, rubber, and silicone adhesives can be used.
Acrylic adhesives are preferred.

The thickness of the elastic body 6 is preferably 0.01 to 20 mm, more preferably 0.1 to 10 mm. Elastic body 6
If the thickness is too small, the effect of reducing the gap between the hollow tube and the membrane tends to be small, and if the thickness is too large, the elastic body 6 is deformed at the time of fusion to increase the effective membrane area. Decrease and film deformation tend to occur.

The width for disposing the elastic body 6 is 5 to 100 mm.
Is preferable, and 10-50 mm is more preferable. Elastic body 6
If the width is too small, the sealing property tends to be insufficient, and if the width of the elastic body 6 is too large, the permeate side flow channel tends to be narrow, and the effective membrane area tends to decrease.

In the manufacturing method of the present invention, the laminated body S2 as shown in FIG. 1 (b), that is, the supply side channel material 2 is provided on the supply side of the opposing membrane 1 and the permeating side of the opposing membrane 1 is provided. The step of forming a laminated body S2 in which the permeation-side flow path member 4 is interposed between the both sides of the permeation side (or the supply side) of the opposing membrane 1 and the heat-fusible material is interposed therebetween. In the present embodiment, an example is shown in which the heat-sealing tape 11 is adhered when the heat-melting material is interposed between both ends of the film 1, but the heat-melting sheet or the heat-melting resin is used. It is also possible to use a powder or the like for temporary attachment.

Examples of the heat-sealing tape 11 include pressure-sensitive adhesive tapes having a heat-melting layer, and specifically, those having a pressure-sensitive adhesive layer directly formed on the heat-melting layer or heat-sealing a tape base material. The thing which formed the adhesive layer and the adhesive layer etc. is mentioned. As the adhesive, any of acrylic, rubber and silicone adhesives can be used.

In the present invention, the main material of the heat-fusible layer, heat-fusible sheet, heat-fusible resin powder, etc. constituting the heat-fusible material is ethylene / vinyl acetate copolymer (EV).
A), ethylene / acrylic acid ester copolymers, polyvinyl acetate, polyvinyl butyral, acrylic resins, thermoplastic resins such as polyisobutylene polyamide, terpene resins, rosin derivatives and the like. The heat-fusible material may further contain a tackifier, a softening agent, a plasticizer, a wax material, other fillers and the like.

Further, in this embodiment, one end portions of the plurality of permeate side flow path members 4 are fixed to the perforated sheet 10 at predetermined intervals, and the membrane 1 and the supply side flow are interposed between the fixed permeate side flow path members 4. Road material 2
An example in which the laminated body S2 is formed by inserting

The membrane 1 used in the present invention may be a porous membrane or a non-porous membrane having a permeation pressure loss of a certain level or more. Specifically, it is a microfiltration membrane, an ultrafiltration membrane or a nanofiltration membrane. Membranes, reverse osmosis membranes, ion exchange membranes, gas separation membranes, dialysis membranes and the like can be mentioned. The material of the film is polypropylene,
Polymer films such as polyolefin such as polyethylene, polysulfone, polyether sulfone, polystyrene, polyacrylonitrile, cellulose acetate, polyamide, polyimide, fluororesin, etc. can be used.

As the supply-side flow path member 2, any conventionally known supply-side flow path member as a spiral wound type membrane element can be used, such as a net, a mesh, a wire woven fabric, a fiber woven fabric, a non-woven fabric, a grooved sheet and a corrugated sheet. Either may be used. Further, the material thereof may be a resin such as polypropylene, polyethylene, polyethylene terephthalate (PET), polyamide, etc., as well as a natural polymer, rubber or metal. However, when elution from the flow path material poses a problem during the separation operation or the like, it is preferable to select the material in consideration of it.

The thickness of the flow path member 2 on the supply side is 0.3 mm or more 2
The porosity in the thickness direction of the supply-side channel material 2 is preferably 10% or more and 80% or less. In addition, when the supply-side channel material 2 has a net shape,
The pitch is preferably 0.5 mm or more and 10 mm or less.

As the permeation-side channel material 4, any permeation-side channel material conventionally known as a spiral wound type membrane element can be used, and a net, mesh, wire woven fabric, fiber woven fabric, non-woven fabric, grooved sheet, corrugated sheet, etc. Either may be used. Further, the material thereof may be any resin such as polypropylene, polyethylene, polyethylene terephthalate (PET), polyamide, epoxy, urethane, etc., as well as natural polymer, rubber or metal. However, when elution from the flow path material poses a problem during the separation operation or the like, it is preferable to select the material in consideration of it.

The thickness of the permeation side flow path member 4 is 0.1 mm or more 2
It is preferably mm or less, and the porosity in the thickness direction of the permeation-side channel member 4 is preferably 10% or more and 80% or less. When the permeation-side flow path member 4 has a net shape, the pitch is preferably 0.3 mm or more and 5 mm or less.

The perforated sheet 10 may be any as long as it allows the fluid to permeate to some extent, and any of the permeation side flow path members 4 that satisfies this condition can be used. A preferable form of the porous sheet 10 is a net,
Examples include mesh and woven wire material. Perforated sheet 10
The aperture ratio or porosity of 10 to 80% is preferable,
80% is more preferable.

As the fixing method, in addition to heat fusion or ultrasonic fusion, adhesion with an adhesive, adhesion with an adhesive tape, a heat adhesive, or mechanical connection with sutures or staples may be used. In addition, an overlapping margin may be provided when fixing.

It is sufficient that at least one end portion of the flow path member is fixed as the fixing portion, but it is fixed over substantially the entire length of one side of the flow path material (end side on the center side as an element) such as a membrane. It is preferable for surely preventing the deviation.

The intervals at which the respective flow path members are fixed to the porous sheet 10 may be modified by the arrangement of the membrane or the like, but it is preferable that the intervals be substantially equal. When the intervals are substantially equal, it is preferable that the outer peripheral length of the hollow tube 5 is divided by the number of flow path members to be fixed.

By fixing the flow path material to the hollow tube 5 in advance as described above, fusion at equal intervals can be made very simple and reliable. Also, there is already known a means for directly welding the permeation-side flow path material to the hollow tube 5 by ultrasonic waves. With this method, the influence of high sound on the human body and the fusion of the perforated portion of the central tube 5 are known. Problems such as insufficient adhesion and difficulty in fusion bonding on the circumference and uneven spacing have occurred, but this problem can also be solved by this method.

In this embodiment, as shown in FIG. 1B, the porous sheet 10 is partially fixed to the hollow tube 5. In this step, the porous sheet 10 and the like are attached to the hollow tube 5. All you have to do is to wind it. For example, the channel material is used as the porous sheet 1.
Before or immediately after fixing to 0, or immediately before winding the porous sheet 10 or the like around the hollow tube 5. The step of fixing the porous sheet 10 is not always necessary, such as when the porous sheet 10 does not slip.

As a method of fixing the porous sheet 10 to the hollow tube 5, in addition to heat fusion or ultrasonic fusion, adhesion with an adhesive, adhesive tape, double-sided tape, adhesion with a heat fusion material, mechanical It may be fixed or otherwise. As a fixing portion, at least the porous sheet 10 may be partially fixed, but it is preferable to fix the porous sheet 10 over substantially the entire length of the end side of the porous sheet 10 in order to favorably perform the winding step.

In this embodiment, when inserting the membrane 1 and the supply side flow path member 2 which is the other flow path material, a continuous film which is alternately folded back is used, and the supply side flow is supplied to the supply side of the continuous film in advance. Road material 2
An example in which the laminate S1 with the intervening is prepared is shown. Such a layered product S1 can be produced, for example, as shown in the process diagrams of FIGS. 2 (a) to 3 (b).

First, as shown in FIG. 2 (a), in order to enhance the sealing property of both ends of the film 1, both ends of the film 1 which is a continuous film are partially heat-bonded (densified) and fused. The part 1a is formed. For example, in the case of a continuous film having a width of 900 to 1016 mm (specifically, a film having a width of 924 mm of 759HR manufactured by Nitto Denko Corporation, etc.), while unrolling it from a roll, a width of 30 mm or less in a region of 30 mm from both ends. To continuously perform heat fusion (heat sealing, ultrasonic welder, etc.). In the illustrated example, the fused portion 1a having a width of 5 mm is provided on the inner side from the positions of 10 mm from both ends.

Next, as shown in FIG. 2B, the fused portion 1
A heat-sealing tape 11 (for example, 20 mm width) having a width of 5 to 30 mm from both ends is attached to the permeation side above a so that wrinkles do not occur at a pressure of 10 kPa or more.

Next, as shown in FIG. 2 (c), the reinforcing adhesive tape 12 (for example, PET tape No. 31B, 50 mm manufactured by Nitto Denko Corporation) is provided at even intervals on the film surface on the supply side.
Width) 20-50 mm width in the length direction 500-150
It is attached at equal intervals of 0 mm (specifically, 750 mm) so that there are no wrinkles in the width direction. This is the portion on the mountain fold side and the valley fold side when continuously folded.

Next, as shown in FIG. 3A, a width 900
10-16 mm (specifically 924 mm) made of PP supply side flow path member 2 is 500-1500 mm (specifically 75 mm)
It is cut to 0 mm) and the supply side flow path material 2 is alternately fixed to the place where the adhesive tape 12 is attached. As a fixing method, there are heat fusion, staple, tape, resin and the like, but an ultrasonic welder is preferable.

Next, as shown in FIG. 3 (b), the substantially central portion of the adhesive tape 12 to which the supply-side flow path material 2 is fixed is bent so that the supply-side flow path material 2 is on the inside. It is bent by a set leaf (for example, 32 leaves) to form a laminate S1. At this time, the one in which the supply-side flow path member 2 is not attached is in a non-bent state. Subsequently, 40-150 ° C, 10-500k for increasing the strength of the folds
It is preferable to perform hot pressing with an air pressure of Pa for 1 to 120 seconds.

To insert this laminate S1 between the permeation side flow path members 4 fixed to the porous sheet 10 as shown in FIG. 1 (b), for example, each permeation side flow path member 4 and leaves are formed. It suffices to alternately superpose them one by one from both sides of the mounting surface, and this process can be automated. In addition, FIG.
When performing the bending process as shown in FIG.
It is also possible to intervene in sequence. In the present invention, as described above, the porous sheet 1 to which the laminate S1 and the channel material are fixed
By preparing 0 in advance, the efficiency becomes very efficient in terms of productivity.

As the hollow tube 5 corresponding to the steps illustrated in FIGS. 2 to 3, for example, modified polyphenylene ether (P
PE) A resin-made φ38 mm, 1016 mm hollow tube is used, and the porous sheet 10 has a width of 800 to 1016 m.
m permeation side flow path material made of PET is 500 to 2000 mm
Those specifically cut to 1750 mm can be used. As the permeation side flow path member 4, 500 to 1500 m
m channel material on the permeate side can be used.

In this embodiment, an example in which both ends of the membrane 1 and the vicinity of the porous sheet 10 are fixed by using the heat-sealing tape 11 when the laminate S1 is inserted to form the laminate S2 Indicates. At this time, the both end sealing portions A1 of the membrane 1 may be sequentially sealed by the number of leaves, and the portion close to the porous sheet 10 may be fixed after the sealing, but both ends of the membrane 1 after winding may be fixed. It is preferable to form the sealing portion A1.

The manufacturing method of the present invention has a step of winding the laminated body S2 around the hollow tube 5, as shown in FIG. 1 (c). In the present embodiment, the example in which the laminated body S2 and the porous sheet 10 are wound at the same time has been described, but the laminated body S2 may be wound after the porous sheet 10 is wound in advance.

For winding, the hollow tube 5 may be set on a winding chuck and the chuck may be wound at a certain speed and tension. It is also possible to wind the roll at a certain speed and then roll it by a load system, but the former method is preferable. At that time, the tension of the central part is 50 to 7 per 1000 mm width of the film 1.
It is preferably performed at 00N.

The manufacturing method of the present invention comprises a step of forming a double-sided sealing portion A1 for sealing both ends of the membrane 1 by fusing a heat-fusible material, a supply side flow passage and a permeation side flow passage. To form another sealing structure for preventing direct communication with each other. In this embodiment, an example in which both steps are performed at the same time is shown, but other sealing structures may be formed after forming the both-end sealing portion A1 or both ends sealing portion A1 may be formed after forming the other sealing structure. Good.

As the step of forming the both-end sealing portion A1,
There may be mentioned a method of sealing both ends of the membrane 1 using the heat-sealing tape 11 with the permeation side flow path member 4 interposed on the permeation side of the membrane 1 facing each other. The sealing method using the heat-sealing tape 11 can be performed by heat-sealing, ultrasonic welding, or a combination of both. The conditions for heat fusion include, for example, 20 to 150 ° C. and 0.1 to 3 hr in a dryer.
It may be heated under the conditions of

Other steps of forming the sealing structure include a step of fusing the elastic body 6 between the hollow tube 5 and the membrane 1 to form the sealing portion A2 around the hollow tube 5. The step of sealing the outer side edge of the membrane 1 when using a plurality of leaves without using a continuous membrane can be mentioned.

The elastic body 6 can be bonded by heat fusion, ultrasonic fusion, a combination of the two, a pressure sensitive adhesive, an adhesive or the like.

In the present invention, after winding, heat treatment is carried out at an appropriate temperature in order to remove the residual stress of the sealed portion that has been heat-sealed, or the winding step does not separate the heat-sealing. You may perform it, heating at temperature. After the above steps, an outer peripheral flow path material such as a net may be wound around the outer peripheral surface of the membrane 1, sealing of the outer peripheral surface, winding of an adhesive tape, or the like may be performed.

On the other hand, the spiral wound type membrane element of the present invention can be suitably manufactured by the above manufacturing method. That is, in the spiral wound type membrane element of the present invention, as shown in FIG. 4, the supply-side channel material 2 is interposed between the opposing membranes 1 on the supply side, and the permeation-side channel material 4 is disposed on the permeate side of the opposing membrane 1. The laminated body having the interposing member is spirally wound around the hollow tube 5 having a hole, and is provided with a sealing structure for preventing direct communication between the supply side flow passage and the permeation side flow passage. The both-ends sealing part A1 for sealing both ends of the film 1 is characterized by being sealed by the heat-fusible material interposed in the facing film 1. In this embodiment, an example is shown in which the sealing portion A2 around the hollow tube 5 in the sealing structure has an elastic body 6 interposed between the hollow tube 5 and the membrane 1.

Membrane 1, supply-side channel material 2, permeate-side channel material 4,
The hollow tube 5, the elastic body 6 and their coupling relationship, and the sealing structure are as described above. In addition, the spiral wound type membrane element of the present invention can be used after being modularized or directly incorporated into a separation device or the like, and used according to the type of the above-mentioned membrane.

[Other Embodiments] (1) In the above-described embodiment, the permeation-side channel material is fixed to the porous sheet at a predetermined interval, and the membrane and the supply-side channel material are provided between the permeation-side channel materials. Although an example of inserting and forming a laminated body has been shown,
The present invention can be carried out without using a porous sheet.
In that case, for example, after the permeation-side channel material is fixed or tentatively fixed to the hollow tube or the elastic body, the membrane and the supply-side channel material are inserted between the permeation-side channel materials and the membrane (attached to the membrane (Including a tape) may be fixed or temporarily fixed to the elastic body, and then the laminated body may be wound, and then the both-end sealing portions of the film may be formed.

(2) In the above embodiment, an example was shown in which the adhesive tape was wound around the hollow tube when the elastic body was arranged, but the present invention can be carried out without disposing the elastic body. Is also possible. Further, instead of the adhesive tape, an O-type sleeve or a C-type sleeve is externally fitted, an elastic body is applied to the periphery of the hollow tube with a constant thickness to solidify, or an elastic body layer is formed on the porous sheet side. You may.

(3) In the above-described embodiment, an example in which the permeation-side channel material is fixed to the perforated sheet so that the hollow tube serves as the permeation-side channel is shown. When there is no problem, to make the hollow tube the flow path on the supply side,
The supply-side channel material may be fixed to the porous sheet.

(4) In the above-described embodiment, a laminate having a supply side flow path material interposed in advance on the supply side of the alternately folded continuous film is prepared, and this is provided between the permeation side flow path materials. Although the example of insertion is shown, first, the continuous membrane may be inserted between the permeation side channel materials, and then the supply side channel material may be inserted between the continuous membranes.

[0060]

EXAMPLES Examples and the like specifically showing the constitution and effects of the present invention will be described below.

Example 1 In order to confirm the effects of the present invention, the spiral wound type membrane element of the present invention was manufactured as follows according to the manufacturing method shown in FIGS. That is, φ38 mm made of PPE resin,
The following foam tape was wound 10 times at a pressure of 10 KPa at a position where a sealing portion of a 1016 mm hollow tube was formed, and an elastic body was arranged.

Structure: Adhesive (acrylic), substrate (closed-cell polyethylene foam), thickness 0.33 mm, tensile strength: 35.6 kg / cm ² , elongation: 411%, density 0.55 g / cm ^3. Foaming ratio of the base foam layer: 5.
0 times, compression hardness: 30 to 90 kPa, shear adhesive strength:
7.5-8.5 kg / cm ² , 180 ° peeling adhesive strength: 1
000-1400 g / 25 mm.

Further, the permeation-side channel material made of PET (fiber woven type, length 1750 mm) is used as the porous sheet, and the permeation-side channel material made of PET (fiber woven type,
750 mm in length, 759H made by Nitto Denko Corporation as a film
R (924 mm width, continuous film), PP as the flow path material on the supply side
Supply side flow path material (net type, length 750 mm),
As the heat-sealing tape, the following tape having a width of 20 mm (M-5213SS, manufactured by Nitto Denko Corporation) was used.

Structure: Heat fusion layer (EVA type, 70 μm thickness), substrate (PET): 12 μm, adhesive layer (acrylic adhesive, 50 μm thickness), Vicket softening point: 41 ° C.,
Ring and ball method softening point: 129 ° C., specific gravity: 0.95 g / cm ³ ,
Elongation: 1200%, tensile strength: 190 g / cm ² , adhesive strength: 1-3 kgf (actual measurement data, 3 for adhesive film)
There is no strength of more than kgf) The tension near the hollow tube at the time of winding is 400 N, and the heat-sealing tape is heated at a temperature of 110 ° C. for 1.5 hours, so that the heat-sealing tape is applied to the hollow tube, the porous sheet, the membrane, and the permeate side. It was fused together with the channel material. After this, the process proceeded to the next process without waiting for the next process and cutting the end face.

Using the obtained spiral wound type membrane element (membrane area 900 cm ² ), it was immersed in 300 ml of ultrapure water and the amount of elution after 3 hours at 50 ° C. was measured. The electric conductivity was 1.5 μS. / Cm, TOC: 1.0ppm
It was (carbon equivalent).

[Brief description of drawings]

FIG. 1 is a process chart schematically showing an example of a method for producing a spiral wound type membrane element of the present invention.

FIG. 2 is a process diagram showing in more detail a part of the process shown in FIG.

FIG. 3 is a process chart showing in more detail a part of the process shown in FIG.

FIG. 4 is a partially cutaway side view showing an example of the spiral wound type membrane element of the present invention.

FIG. 5 is a process chart schematically showing an example of a conventional method for manufacturing a spiral wound type membrane element.

[Explanation of symbols]

1 membrane 2 Flow path side material 4 Permeation side flow path material 5 hollow tubes 10 Perforated sheet 11 Heat-fusion tape (heat-fusion material) A1 Both ends sealing part (sealing structure) A2 Inner circumference sealing part (sealing structure)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsumi Ishii             1-2 1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto             Electric Works Co., Ltd. F-term (reference) 4D006 GA03 GA06 GA07 GA32 HA61                       HA62 JA05A JA05C JA06A                       JA06C JA19A JA19Z JB04                       JB05 JB07 MC18 MC22 MC23                       MC28 MC35 MC39 MC45 MC54                       MC62 PB70 PC80

Claims (3)

[Claims] 1. A laminated body in which a supply-side channel material is interposed on the supply side of opposed membranes and a permeation-side channel material is interposed on the permeation side of opposed membranes in a spiral shape in a hollow tube having a hole. In a spiral wound type membrane element having a sealing structure that is wound and the supply side flow passage and the permeation side flow passage do not directly communicate with each other,
A spiral wound type membrane element, wherein both ends of the sealing structure for sealing both ends of the film are sealed by a heat-fusible material interposed in the facing film. 2. A supply-side channel material is provided on the supply side of the opposing membrane, a permeation-side channel material is provided on the permeation side of the opposing membrane, and both sides of the permeation side or the supply side of the opposing membrane are provided. Is a step of forming a laminated body in which the heat-fusible material is interposed, a step of winding this laminated body around a perforated hollow tube, and a step of fusing the heat-fusible material so that both ends of the film are fused. A method for manufacturing a spiral wound type membrane element, comprising: a step of forming a sealed portion on both ends for sealing; and a step of forming another sealing structure for preventing the supply-side flow passage and the permeation-side flow passage from directly communicating with each other. 3. A heat-fusible sheet is temporarily attached or an adhesive tape having a heat-fusible layer is attached when the heat-fusible material is interposed between both ends of the film. For manufacturing a spiral wound type membrane element.