JP2003275544A - 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 deviation of a membrane and a flow path material is easily prevented, the workability of fixing the flow path material is excellent and the insertion work of the membrane and the flow path material is facilitated, and the manufacturing method. <P>SOLUTION: In the spiral type membrane element, a laminated body for 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 sealing part A2 around the hollow pipe 5 of the sealing structures is composed by interposing an elastic body 6 between the hollow pipe 5 and the 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, it relates to an improvement in the sealing portion between the hollow tube and the surrounding membrane.

[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 hollow tube 5 as shown in FIG.
The sealing portion B around is important. That is, when the laminated body is wound around the hollow tube 5, a gap (triangular nest or the like) is formed between the membrane 1 and the hollow tube 5, so that an epoxy resin, It is necessary to form the sealing portion B by applying an adhesive such as urethane resin and curing the same.

[0005]

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 increases the number of working steps, reduces production efficiency, and (2) requires several tens of hours until the coated adhesive is completely cured. Therefore, there is a problem that a long waiting time is required to proceed to the next step, (3) the coating is applied only to the surface of the void portion, and reliability is low in terms of ensuring the sealing property. The decrease in the sealing property causes the permeated liquid to be contaminated and the rejection rate to be decreased due to the performance of the separation membrane.

[0006] Therefore, an object of the present invention is to eliminate the need for an adhesive application step for forming a sealing portion around the hollow tube and a waiting time for curing, and moreover, between the membrane and the hollow tube. It is an object of the present invention to provide a spiral wound type membrane element having a good sealing property at a sealing portion, and a method for manufacturing the same.

[0007]

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 sealing structure, a sealing portion around the hollow tube is characterized in that an elastic body is interposed between the hollow tube and the membrane.

In the above, it is preferable that the elastic body includes a foamed body of a thermoplastic resin.

On the other hand, in the method for manufacturing a spiral wound type membrane element of the present invention, a step of arranging an elastic body at a position forming a sealing portion around a perforated hollow tube and a step of supplying the opposite side to a supply side of the membrane are provided. A step of forming a laminate in which the permeate side channel materials are respectively interposed on the permeate sides of the membranes facing the side channel materials, a step of winding the laminate around the hollow tube, and the hollow tube A step of forming the sealing portion around the hollow tube by arranging the elastic body between the membrane and another sealing structure for preventing the supply-side channel and the permeation-side channel from directly communicating with each other. And a forming step. Here, the step of forming another sealing structure refers to a step of sealing between respective members such as films, and this step may be divided into a plurality of steps. You can go.

In the above, when disposing the elastic body, it is preferable to wind an adhesive tape having a foamed body of a thermoplastic resin as a base material around the hollow tube.

[Operation and Effect] According to the spiral wound type membrane element of the present invention, since the sealing portion around the hollow tube has the elastic body interposed between the hollow tube and the membrane, the sealing portion can be It is possible to eliminate the step of applying the adhesive for forming and the waiting time for curing. Further, since the elastic body is arranged, appropriate deformation occurs, and the gap between the hollow tube and the membrane can be reduced to improve the sealing property of the sealing portion. Further, since the elastic body is interposed between the hollow tube and the membrane, the sealing property of the sealing portion can be improved by increasing the area of the elastic body and increasing the sealing area.

When the elastic body contains a thermoplastic resin foam, deformation is increased due to the foam, and the gap between the hollow tube and the membrane is made smaller, thereby sealing by sealing. The sex can be further enhanced.

On the other hand, according to the manufacturing method of the present invention, since the elastic body is arranged at the position where the sealing portion around the hollow tube is formed to form the sealing portion around the hollow tube, the sealing is performed. It is possible to eliminate the step of applying the adhesive for forming the portion and the waiting time for curing. Further, since the elastic body is used, appropriate deformation occurs, and the gap between the hollow tube and the membrane can be reduced to improve the sealing property of the sealing portion. Furthermore, since the elastic body is previously arranged around the hollow tube, the sealing property can be improved by increasing the area of the elastic body and increasing the sealing area.

When arranging the elastic body, when an adhesive tape having a foamed body of a thermoplastic resin as a base material is wound around the hollow tube, the adhesive tape is used. The elastic body can be easily placed around the hollow tube, and its base material is foam, so the deformation is increased and the gap between the hollow tube and the membrane is made smaller, thereby sealing. It is possible to further enhance the sealing property.

[0015]

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.

As shown in FIG. 1 (a), the manufacturing method of the present invention has a step of disposing the elastic body 6 at the position where the sealing portion A2 is formed around the perforated hollow tube 5. The formation position of the sealing portion A2 is determined according to the width of the film 1, and is near the position where both ends of the film 1 are arranged.

As the hollow tube 5, any conventionally known tube can be used, for example, a hollow tube made of metal, fiber reinforced plastic, plastic, ceramics or the like and having a hole. 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 reduced, and if the thickness is too large, the elastic body 6 is deformed significantly, and the effective membrane area is reduced or the membrane is reduced. Deformation tends 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, as shown in FIG. 1 (b), the supply side channel material 2 is provided on the supply side of the opposing membrane 1 and the permeation side channel material 4 is provided on the permeation side of the opposing membrane. There is a step of forming the interposed laminated body S2. In this embodiment, one ends of a plurality of permeate-side channel members 4 are fixed to the porous sheet 10 at predetermined intervals, and the membrane 1 and the supply-side channel member 2 are inserted between the fixed permeate-side channel members 4. An example of forming the laminated body S2 is shown.

The membrane 1 used in the present invention may be a porous membrane or a non-porous membrane having a pressure loss of a certain level or more in permeation, and specifically, it is a microfiltration membrane, an ultrafiltration membrane or a nanofiltration. 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 material 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
It is preferable that the flow path member 2 has a porosity of 10% or more and 95% or less in the thickness direction. When the supply-side flow path member 2 has a net shape, its 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, a mesh, a wire woven fabric, a fiber woven fabric, a non-woven fabric, a grooved sheet, a 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 permeate 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 one as long as it allows 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 method of fixing, in addition to heat fusion or ultrasonic fusion, adhesion by an adhesive, adhesion by an adhesive tape, a heat fusion material, or mechanical connection by suture or staple 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.

As described above, by fixing the flow path material to the hollow tube 5 in advance, 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 process, 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 the 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 flow channel material 2 on the other side, which is the flow channel material of the other side, continuous membranes that are alternately folded back are used, and the flow on the feed side of the continuous membrane is preliminarily provided. 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 then 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. Heat fusion tape 11
Is, for example, a heat-fusible base tape provided with an adhesive layer, and may not be provided with an adhesive layer.

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 equidistantly provided 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 approximately central portion of the adhesive tape 12 to which the supply-side flow path member 2 is fixed is bent so that the supply-side flow path member 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 the present embodiment, an example of performing a step of forming a sealing structure for preventing direct communication between the supply-side flow passage and the permeation-side flow passage after inserting the laminate S1 into the laminate S2 will be described. . In this example, using the above heat-sealing tape 11,
Both ends of the membrane 1 are sealed while the permeation side flow path member 4 is interposed on the permeation side of the opposing membrane 1, and the both ends of the membrane 1 and the proximity portion of the porous sheet 10 are fixed. The former sealing forms the both-end sealing portion A1. At that time, both ends of the membrane 1 may be sequentially sealed by the number of leaves, and after the sealing, the portion close to the porous sheet 10 may be fixed.

Regarding the sealing method, in addition to heat fusion using the heat fusion tape 11 and ultrasonic fusion, adhesion with an adhesive, adhesive tape, double-sided tape, adhesion with a heat fusion material, etc. may be used. Good.

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 constant 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.

According to the manufacturing method of the present invention, the elastic member 6 is fused between the hollow tube 5 and the membrane 1 so that the sealing portion A2 is provided around the hollow tube 5.
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. Examples of the latter step include the above-described step of forming the both-end sealing portion A1 and the step of sealing the outer edge of the film 1 when using a plurality of leaves without using a continuous film.

The elastic body 6 can be adhered 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 from 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 preferably 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 sealing portion A2 around the hollow tube 5 is characterized in that an elastic body 6 is 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 temporarily fixed to the elastic body, the membrane and the supply-side channel material are inserted between them to fix the membrane (including the tape adhered to the membrane) to the elastic body. The laminated body may be wound after being temporarily fixed.

(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 placed. However, instead of the adhesive tape, an O-type sleeve or a C-type sleeve is used. May be externally fitted, an elastic body may be applied to the periphery of the hollow tube with a constant thickness to be solidified, or an elastic body layer may be formed on the porous sheet side.

(3) In the above-described embodiment, an example is shown in which the permeation-side channel material is fixed to the perforated sheet so that the hollow tube serves as the permeation-side channel. 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 channel material interposed in advance on the supply side of the alternately folded back continuous film is prepared, and this is provided between the permeation-side channel 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.

(5) In the above-described embodiment, an example in which the porous sheet or the like is wound around the hollow tube after forming (sealing) both ends of the membrane is shown. After or while being wound around the tube, both ends of the membrane may be sequentially sealed by the number of leaves, and after the sealing, the vicinity of the porous sheet may be sealed.

[0056]

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. 1 to 3, and the sealing property was evaluated. That is, modified P
The foamed tape described below was wound 10 times at a pressure of 10 KPa at a position where a sealing portion of a hollow tube made of PE resin and having a diameter of 38 mm and 1016 mm 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, is used as the permeation side channel material.
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),
20 mm width as a heat-sealing tape manufactured by Nitto Denko Corporation, M
-5213SS was used.

Further, the both ends of the film are sealed as usual,
The tension in the vicinity of the hollow tube at the time of winding was set to 400 N, and then the sealing portion was fused by heating at a temperature of 110 ° C. for 1.5 hours. An airtightness retention inspection was performed, and the sealability could be secured without repair resin. This sealability was confirmed by leaking from the permeate side with compressed air of 49 KPa, and measuring the holding time from -530 mmHg to -480 mmHg with the element in a vacuum state, and it was confirmed that there was no leak.

[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 partially cutaway side view showing an example of a conventional spiral wound type membrane element.

[Explanation of symbols]

1 membrane 2 Flow path side material 4 Permeation side flow path material 5 hollow tubes 6 elastic body 10 Perforated sheet A1 Both ends sealing part (sealing structure) A2 Inner circumference sealing part (sealing structure)

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Claims (4)

[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 a sealing portion around the hollow tube in the sealing structure has an elastic body interposed between the hollow tube and the membrane. 2. The spiral wound type membrane element according to claim 1, wherein the elastic body includes a foamed body of a thermoplastic resin. 3. A step of disposing an elastic body at a position where a sealing portion is formed around a perforated hollow tube, and a supply-side channel material is provided on the supply side of the opposing membrane on the permeation side of the opposing membrane. A step of forming a laminated body in which each of the permeation side flow path members is interposed, a step of winding the laminated body around the hollow tube, and arranging the elastic body between the hollow tube and the membrane. Of a spiral wound type membrane element having a step of forming a sealing portion around a hollow tube by forming a hollow tube and a step of forming another sealing structure for preventing direct communication between the supply-side flow passage and the permeation-side flow passage. Method. 4. The method for producing a spiral wound type membrane element according to claim 3, wherein an adhesive tape having a thermoplastic resin foam as a base material is wound around the hollow tube when the elastic body is arranged. .