JP5090017B2 - Spiral type membrane element and manufacturing method thereof - Google Patents

Description

  In the present invention, a separation membrane, a supply-side channel material, and a permeate-side channel material are spirally wound around a perforated central tube in a laminated state and exist in various fluids (liquid or gas) The present invention relates to a spiral membrane element capable of separating a specific component to be separated and a manufacturing method thereof.

  Conventionally, as a fluid separation element used for reverse osmosis filtration, microfiltration, etc., for example, as shown in FIG. 5, the separation membrane 1, the supply-side flow path material 2, and the permeation-side flow path material 3 are perforated in a laminated state. A spiral type in which a cylindrical wound body R wound in a spiral shape is provided around the central tube 5 and sealing portions 11 to 13 are provided to prevent mixing of the supply side fluid and the permeation side fluid. Membrane elements are known.

  In this spiral membrane element, the supply-side fluid (raw water) is guided to the surface of the separation membrane 1 by the supply-side flow path material 2 and separated through the separation membrane 1, and then the permeation-side fluid (permeated water) is permeated. It is led along the side channel material 3 to the central pipe 5 (water collecting pipe). Such a spiral membrane element may be provided with a fiber reinforced resin (FRP) as an exterior material on the outer periphery for the purpose of imparting pressure resistance and shape retention during pressure operation (not shown).

  As shown in FIGS. 6 (a) to 6 (b), such a spiral membrane element generally has a structure in which a supply-side channel material 2 is disposed between two folded separation membranes 1, and a permeation side. Permeate side flow path material positioned on the periphery (3 sides) of the separation membrane in order to stack the flow path material 3 and form a sealing portion that prevents mixing of the supply side fluid and permeate side fluid The separation membrane unit U is manufactured by applying to 3, and one or more of the units U are wound around the central tube 5 in a spiral shape, and the periphery of the separation membrane is further sealed. This example is a case where there are a plurality of membrane leaves (sealed envelope-like membranes), but there are cases where there is a single membrane leaf.

  In addition, the exterior material is usually formed by wrapping a membrane leaf around a central tube to cure the sealing resin, and then impregnating the outer peripheral surface of the cylindrical wound body with a glass roving (from a strand of glass filament). A converging body) is wound and cured to form FRP (see, for example, Patent Documents 1 and 2).

  However, in the above method, since the exterior material is applied after the film leaf is wound and sealed, an exterior material winding step and a curing step are required in addition to the curing waiting time for sealing. In particular, when winding a glass roving impregnated with a resin, it was a troublesome and time-consuming process to wind the glass roving so as to obtain a uniform reinforcing effect. For this reason, in the above method, the manufacturing process becomes complicated, requiring a long time, and it is disadvantageous in terms of cost including the material.

Japanese Patent Laid-Open No. 2001-17840 JP 2000-354742 A

  Accordingly, an object of the present invention is to provide a spiral membrane element capable of forming a uniform fiber reinforced layer on the outer peripheral surface by a simple method without significant change of material, and a method for manufacturing the same.

The above object can be achieved by the present invention as described below.
A spiral membrane element of the present invention includes a cylindrical wound body in which a separation membrane, a supply-side channel material, and a permeate-side channel material are wound in a spiral shape around a perforated central tube in a stacked state. In addition, in the spiral membrane element provided with a sealing portion for preventing the supply-side fluid and the permeation-side fluid from being mixed, a fiber cloth in which at least one permeation-side channel material is extended or connected to the outer peripheral side is provided. And a fiber reinforcing layer in which the fiber cloth is wound around the outer periphery of the cylindrical wound body and the resin is impregnated and hardened is formed.

  According to the spiral membrane element of the present invention, the permeate-side channel material has a fiber cloth extended or connected to the outer peripheral side, the fiber cloth is wound around the outer periphery of the cylindrical wound body, and the resin is Since the impregnated and hardened fiber reinforcing layer is formed, a uniform fiber reinforcing layer can be formed on the outer peripheral surface by a simple method without significant change of the material. For this reason, the manufacturing process is simplified, the manufacturing time can be shortened, and the manufacturing can be advantageously performed in terms of cost. In the present invention, in particular, when the permeation-side channel material has a fiber cloth extended to the outer peripheral side, the spiral membrane element can be manufactured by a simpler method without significant change of the material.

  In the above, it is also possible to wind a resin sheet inside or inside the fiber reinforcement layer. Conventionally, since the outside of the fiber reinforced resin has irregularities, it is difficult to stick the display label, and it may come off during use because it comes into contact with raw water. Such a problem can be avoided by winding the label (including the display label) inside or inside the fiber reinforcement layer.

On the other hand, the manufacturing method of the spiral membrane element of the present invention is a cylindrical shape in which a separation membrane, a supply-side channel material, and a permeate-side channel material are spirally wound around a perforated central tube in a laminated state. In the method for manufacturing a spiral membrane element comprising a step of forming a wound body and a step of forming a sealing portion for preventing mixing of the supply side fluid and the permeate side fluid, at least one of the permeate side channel members When forming the cylindrical wound body by using a fiber cloth that is extended or connected to the rear end side of the winding and a resin is applied to the fiber cloth as one permeate-side channel material In addition, the resin is cured after the fiber cloth is wound around the outer periphery of the cylindrical wound body.

According to the manufacturing method of the present invention, as the permeate-side flow path material, a material having a fiber cloth extended or connected to the rear end side of the winding and having a resin applied to the fiber cloth is used. A uniform fiber reinforcement layer can be formed without change. Further, when forming the cylindrical wound body, after the extended portion of the fiber cloth is wound around the outer periphery of the cylindrical wound body, a fiber reinforcing layer is formed by a simple method in order to cure the resin. can, Hakare be shortened manufacturing time, it is possible to manufacture the organic advantage in cost.

  In the above, when winding the extended portion of the fiber cloth, it is wound together with a release sheet having releasability from the resin, and the release sheet is peeled and removed after the resin is cured, so that an extra extension portion is obtained. Is preferably excised. By using such a release sheet and removing it after curing, it is possible to prevent foreign matters from adhering to the outer surface of the fiber reinforcing layer and unevenness from being easily generated on the outer surface.

  Moreover, it is preferable to use an adhesive having thixotropy when forming the sealing portion, and to use a resin having a lower viscosity than the adhesive as a resin applied to the fiber cloth. As the resin (adhesive) that forms the sealing part, it is preferable to use a resin having a high viscosity, and it retains its shape without flowing in the stationary state after application and winding, and tightening stress during winding By having thixotropy that expands in the gap corresponding to the above, it is possible to form a good sealing portion without any loss of resin. In addition, when the resin of the fiber reinforcement layer wound around the outer periphery has a lower viscosity than the resin used for the sealing portion, the impregnation into a reinforcing material such as glass fiber is good and the transparency is improved. Product label visibility is good.

From this point of view, the viscosity of the adhesive, using a # 6 rotor with BH type viscometer under conditions of 20 rpm, a 5000~100000mPa · s, the viscosity of the resin to be applied to the fiber fabric, the same It is preferable that it is 100-10000 mPa * s on condition.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 are process diagrams showing an example of a method for producing a spiral membrane element of the present invention. FIG. 4 is a front view showing an example of the spiral membrane element of the present invention.

  The spiral membrane element of the present invention is different from the conventional one only in the method and structure of forming the exterior material, and any of the above-described configurations of the conventional spiral membrane element can be applied to other structures.

  Therefore, as shown in FIG. 5, the spiral membrane element of the present invention has a separation membrane 1, a supply-side channel material 2, and a permeate-side channel material 3 in a laminated state around a perforated central tube 5. A cylindrical winding body R wound in a spiral shape is provided, and a sealing portion for preventing mixing of the supply side fluid and the permeation side fluid is provided. The sealing portion includes, for example, a both-end sealing portion 11 and an outer peripheral side sealing portion 12, and even if the inner peripheral side sealing portion 13 is formed so as to perform sealing around the center tube 5. Good.

  The spiral membrane element of the present invention comprises a separation membrane 1, a supply-side channel material 2, and a permeate-side channel material 3 wound in a spiral shape around a perforated central tube 5 in a laminated state. It can be manufactured by a process of forming the body R and a process of forming the sealing portions 11 and 12 for preventing the supply side fluid and the permeation side fluid from being mixed.

  Specifically, it can be manufactured by first performing the process shown in FIG. FIG. 1 is a front view showing a state before the separation membrane units are stacked and wound, and each separation membrane unit U is basically the same as that shown in FIG. 6 (a).

  As shown in FIG. 6A, first, the supply-side fluid 3 and the permeation-side fluid 3 are stacked while the separation membrane 1 is folded in half, and the supply-side fluid and the permeation-side fluid are stacked. A unit is prepared in which adhesives 4 and 6 for forming a sealing portion that prevents the mixing of these are applied to both end portions in the axial direction and winding end portions of the permeate-side flow path member 3. At this time, a protective tape may be attached to the fold portion of the separation membrane 1.

  As the separation membrane 1, a reverse osmosis membrane, an ultrafiltration membrane, a microfiltration membrane, a gas separation membrane, a degassing membrane, or the like can be used. For the supply-side channel material 2, a net-like material, a mesh-like material, a grooved sheet, a corrugated sheet, or the like can be used. For the permeate-side channel material 3, fiber fabric such as nonwoven fabric, woven fabric, knitted fabric, net-like material, mesh-like material, grooved sheet, corrugated sheet, and the like can be used.

  The perforated center tube 5 only needs to have an opening around the tube, and any conventional tube can be used. In general, the central tube 5 is made of a material such as ABS resin, polyphenylene ether (PPE), polysulfone (PSF), etc., and its diameter varies depending on the size of the membrane element, but is, for example, 20 to 100 mm.

  As the adhesives 4 and 6, any conventionally known adhesives such as urethane adhesives, epoxy adhesives, hot melt adhesives and the like can be used. However, an adhesive containing a thermosetting resin such as a urethane-based adhesive or an epoxy-based adhesive is preferable in performing a curing reaction by heating.

  In particular, in the present invention, it is preferable to use an adhesive having thixotropy when the both-end sealing part 11 and / or the outer peripheral side sealing part 12 are formed. The resin (adhesive) that forms the sealing portions 11 and 12 is preferably a resin having high viscosity, and retains its shape without flowing in the stationary state after application and winding. Has thixotropy that expands in the gap corresponding to the tightening stress, so that a good sealing portion can be formed without any loss of resin. As the adhesive having thixotropic properties, various adhesives using urethane or epoxy resin are commercially available.

  In addition, thixotropy (thixotropy) is a phenomenon that appears when the state of a dispersion solution or the like is switched between sol and gel with respect to stress, and is a phenomenon that is seen in a dispersion solution that is easily gelled. When there is no stress, it is in a gel state and does not show fluidity, but when an external force is applied, part or all of the intermolecular force of the gel structure is destroyed, so that it becomes a sol state and restores fluidity. Further, when the external force stops working, the gel structure is regenerated, so that the fluidity is lost again.

The viscosity of the adhesive using a # 6 rotor with BH type viscometer under conditions of 20 rpm, is preferably from 5000~100000mPa · s, 20000~50000mPa · s is more preferable. In the case of exhibiting thixotropy, the ratio of the viscosity at different stresses is large, for example, the viscosity at 2 rpm with respect to the viscosity at 20 rpm is twice or more, but preferably 3 to 7 times.

  Next, as shown in FIG. 1, a plurality of the separation membrane units U are stacked and wound around the perforated center tube 5 in a spiral shape.

  As shown in FIGS. 1 to 4, the spiral membrane element of the present invention has a fiber cloth 23 a in which at least one permeate-side channel material 3 is extended or connected to the outer peripheral side, and the fiber cloth 23 a A fiber reinforcing layer 25 ′ wound around the outer periphery of the cylindrical wound body R and impregnated and cured with resin is formed. In the present embodiment, an example is shown in which one permeate-side channel material 3 is composed of a fiber cloth 23 having a fiber cloth 23a extended to the outer peripheral side.

  As shown in FIGS. 1 to 4, such a fiber reinforcing layer 25 ′ is extended or connected to the rear end side of the winding as at least one permeation side flow path member 3 among the permeation side flow path members 3. The fiber cloth 23a was wound around the outer periphery of the cylindrical wound body R when forming the cylindrical wound body R using the fiber cloth 23a having the fiber cloth 23a coated with resin. Thereafter, it can be formed by curing the resin. In this embodiment, as shown in FIG. 1, the permeation | transmission side flow-path material 3 fixed to the center pipe 5 is comprised with the fiber cloth 23, and the example which has the extended fiber cloth 23a is shown.

Accordingly, in the process shown in FIGS. 1 to 2, the tip of the fiber cloth 23, which is a long permeation-side channel material 3, is bonded or adhesively fixed to the central tube 1, and the permeation- side channel material 3 is placed on the permeation- side channel material 3. Then, the resin is applied to the sealing portion of the separation membrane unit U while being applied with resin, and then wound around the central tube 5 to form a cylindrical wound body R.

  The fiber cloth 23 that is the reinforcing phase (support) of the fiber reinforcing layer 25 ′ is made of a material such as PET, PP, PE, PSF, polyphenylene sulfide (PPS), etc. it can. Examples of the fiber cloth 23 include non-woven fabric, woven fabric, and knitted fabric, and the thickness is preferably 0.2 to 1 mm.

  As the resin applied to the fiber cloth 23a, the polyurethane resin or the epoxy resin used when forming the cylindrical wound body R can be used as it is. However, the fiber reinforced layer 25 ′ corresponding to the exterior material is used for the cylindrical wound body R. It is also possible to change the type of resin relative to the resin.

  As the resin applied to the fiber cloth 23a, it is preferable to use a resin having a lower viscosity than the adhesives 4 and 6 forming the sealing portions 11 and 12. Thereby, the impregnation property to the reinforcing material such as glass fiber is good, the transparency is improved, and the visibility of the product label is improved.

The viscosity of the resin applied to the fiber fabric 23a uses # 6 rotor with BH type viscometer under conditions of 20 rpm, is preferably from 100~10000mPa · s, more preferably from 500~7000mPa · s More preferably, it is 1000 to 3000 mPa · s. Examples of such resins include polyurethane resins and epoxy resins.

  As described above, it is preferable that the resin used in the process of forming the sealing portions 11 and 12 and the resin of the fiber reinforcement layer 25 ′ that hardens the outer periphery of the wound body are different in function.

  The combination of the urethane resin and the epoxy resin is combined depending on the application. For example, when heat resistance is required, both the sealing portions 11 and 12 and the fiber reinforcement layer 25 ′ should use an epoxy resin. Is preferred.

  The number when the separation membrane unit U is stacked is determined according to the required permeation flow rate and may be one or more layers, but about 100 layers is the upper limit in consideration of operability. The longer the separation membrane unit U is, the fewer the number of layers is.

  In the present embodiment, as shown in FIG. 4, an example is shown in which a resin sheet 24 is wound inside or inside the fiber reinforcement layer 25 ′ while being bonded to a resin. Also, as shown in FIG. 2, when the fiber cloth 23a is wound, it is wound together with a release sheet 26 having releasability from the resin, and the interface of the release sheet 26 is peeled off after the resin is cured. The example including the process of excising the performed part is shown.

  In this embodiment, as shown in FIG. 2, on the extended fiber cloth 23a, the part where the resin sheet 24 is placed, the part where the resin 25 is applied, and the release sheet 26 are arranged in order from the leading end side of the winding. A placed part, a part to which the hot melt adhesive 27 is applied, and a part having only a fiber cloth are provided.

  The portion where the resin 25 is applied is preferably provided for 1 to 5 turns so that the strength of the fiber reinforcing layer 25 ′ can be sufficiently obtained. The hot melt adhesive 27 is provided for hot melt bonding so that the last tightening force is not loosened, and is applied in the width direction and temporarily fixed until the resin is cured.

  As the release sheet 26, any sheet having releasability from the resin may be used, and a sheet coated with a silicone resin, a fluororesin, various release agents, etc. in addition to a sheet or film such as PE, PP, or PET. , Film, paper and the like. The release sheet 26 is preferably wound with a length of one or more rounds. The resin sheet 24 may be adhered to the resin of the fiber reinforcement layer 25 ′, or may be adhered by providing an adhesive layer on the resin sheet 24.

  As the resin sheet 24, those having good adhesion with the cylindrical roll R and preferably followable are preferable. For example, sheets of PP, PE, polyvinyl chloride (PVC), polystyrene (PS), rubber, A film etc. are mentioned. Such a resin sheet 24 can also be used as a display label. When used as a display label, printing for display or the like is attached to the outer peripheral side, and about one turn is involved. The display label can be provided over substantially the entire width in the width direction. On the display label, a product name, a company name, an appropriate design, and the like can be displayed.

  In the case where the resin sheet 24 is to be wound, any position near the surface of the wound body or the surface of the fiber reinforcing layer 25 ′ may be used. Further, the fiber reinforcing layer 25 ′ can be formed in multiple layers depending on the length of winding, and in that case, it can be installed in the middle of the fiber reinforcing layer 25 ′.

  A cylindrical wound body R is wound on such an extended portion while applying tension to the rear end side of the winding, and hot melt bonding is performed as shown in FIG. obtain. This is cured by heating or the like in this state. The conditions at the time of curing are appropriately set according to the type of resin and adhesive used.

  The resin sealing of the separation membrane unit U (cylindrical winding body R) and the curing of the resin of the fiber reinforcement layer 25 ′ may be performed separately, but in the present invention, the separation membrane unit U (cylindrical winding) is used. It is preferable to simultaneously perform the resin sealing of the rotating body R) and the curing of the resin of the fiber reinforcing layer 25 ′. In that case, it is preferable to use the same kind of resin as both resins. That is, when performing the curing reaction by heating, it is preferable to use a resin containing a thermosetting resin such as a urethane-based adhesive or an epoxy-based adhesive.

  After the resin is cured, the interface of the release sheet 26 is peeled off, and the peeled portion is excised to form a spiral membrane element in which a fiber reinforcing layer 25 'having a flatter outer surface is formed as shown in FIG. Is obtained.

  The spiral wound membrane element R may be trimmed at both ends in order to adjust the axial length of the cylindrical wound body R after resin sealing. Further, a perforated end member for preventing deformation (such as a telescope), a sealing material, a reinforcing material, and the like can be provided as necessary.

[Other Embodiments]
(1) In the above-described embodiment, an example in which one permeate-side flow path member has a fiber cloth extended to the outer peripheral side has been shown. However, the permeate-side flow path member has a fiber cloth connected to the outer peripheral side. It may be a thing. In that case, the fiber reinforcing layer is formed by using a fiber cloth connected to the rear end side of the winding and having a resin applied to the fiber cloth as the permeate side channel material.

  When connecting the fiber cloth to the permeate-side channel material, it is also possible to use a glass fiber cloth such as a glass cloth, a metal fiber cloth such as a metal mesh screen, etc. in addition to a fiber cloth made of resin. In that case, the thickness of the connected fiber cloth is preferably 0.1 to 1 mm, and more preferably 0.2 to 0.5 mm.

  In addition, the fiber reinforcement layer may be formed by having a fiber cloth in which a plurality of (for example, two sheets to the total number of leaves) permeation-side flow path members are extended or connected to the outer peripheral side. In that case, when apply | coating the adhesives 4 and 6, resin may be apply | coated to the fiber cloth extended or connected, and it may wind after lamination | stacking.

  (2) In the above-described embodiment, an example in which the permeation-side flow path material fixed to the central tube is made of fiber cloth and has an extended fiber cloth is shown, but the permeation side that is not fixed to the central tube A fiber cloth may be extended or connected to the channel to form a fiber reinforcing layer.

  (3) In the above-described embodiment, as shown in FIG. 2, the portion where the resin sheet 24 is placed, the portion where the resin 25 is applied, the portion where the release sheet 26 is placed, and the portion where the hot melt adhesive 27 is applied Although an example in which only a fiber cloth part is provided has been shown, in the present invention, all or part of it can be omitted except for the part to which the resin 25 is applied.

  (4) In the above-described embodiment, when the separation membrane unit is manufactured, the separation membrane is folded in half and the supply-side flow path material is sandwiched. However, the separation membrane unit is folded back alternately using a continuous separation membrane. It is also possible to sandwich the supply-side channel material and the permeation-side channel material. In that case, it suffices to provide a cut-out portion of the permeate-side channel material only for the both-end sealed portions.

  (5) In the above-described embodiment, as shown in FIG. 1, the permeation-side channel material 3 is overlapped on the separation membrane 1 folded in half so as to sandwich the supply-side channel material 2, and the adhesive 4 In the present invention, it is also possible to apply the adhesives 4 and 6 on the separation membrane 1 that is folded in two on the permeate-side channel material 3.

(6) In the above embodiments, as shown in FIG. 1, using a plurality of separation membrane units U, an example is shown of producing a spiral membrane element comprising a plurality of membrane leaves, in the present invention, using a set of separation membrane unit U, may be produced spiral membrane element comprising one membrane leaf. In that case, the one permeation | transmission side channel material to be used has a fiber cloth extended or connected to the outer peripheral side.

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

Example 1
First, a membrane leaf unit comprising a Nitto Denko RO membrane ES20 and a PP supply side channel material having a thickness of 0.7 mm was prepared. Next, the tip of a 0.3 mm-thick PET permeation-side channel material is fixed to a PPE hollow center tube having a diameter of 32 mm. It was loaded while applying.

  Next, the membrane leaf unit loaded while applying tension by rotating the hollow central tube around the shaft was wound. After winding the membrane leaf unit, the display resin sheet was continuously wound in a length corresponding to the circumference of the wound body. Next, the polyurethane resin was applied to the permeation side channel material at the rear of the resin sheet so as to impregnate the entire surface with a length corresponding to the circumferential length of the wound body, and then continuously wound.

  Subsequently, the release sheet was placed on the permeate-side channel material so that the release sheet completely covered the outside of the fiber reinforced resin. A hot melt resin was applied in the width direction to a portion immediately after the release sheet was wound, and temporarily fixed so that the wound wound body was not loosened.

  After the resin was cured, the outer layer of the release sheet was cut open, and the release sheet was peeled off to produce a spiral membrane element. The outer surface of the membrane element became smooth, and the display of the display resin sheet inside the fiber reinforced layer was fully visible. Further, the fiber reinforced layer showed a strength sufficient to withstand actual operation.

Example 2
In Example 1, an adhesive having a thixotropic property (polyurethane resin, a two-component adhesive in which polyurethane and polyisocyanate are mixed) is used as an adhesive for a sealing portion, and as a resin to be applied to a permeate-side channel material, A spiral membrane element was produced in the same manner as in Example 1 except that a low-viscosity epoxy resin (a two-component curable resin in which bisphenol A type epoxy resin and polyamidoamine were mixed) was used. The viscosity of the viscosity of the adhesive and the resin, using a # 6 rotor with BH type viscometer under conditions of 20 rpm, was used are each 28000mPa · s and 2000 mPa · s.

  When the adhesive is applied and in a stationary state after winding, the adhesive does not flow and the shape is maintained, and at the time of winding, a sealing portion free from resin loss can be formed due to thixotropy. It was. Further, the outer surface of the obtained membrane element was smooth, the resin impregnation property was good and the transparency was improved, and the display of the resin sheet for display inside the fiber reinforced layer could be seen more clearly. Further, the fiber reinforced layer showed a strength sufficient to withstand actual operation.

Process drawing which shows an example of the manufacturing method of the spiral type membrane element of this invention Process drawing which shows an example of the manufacturing method of the spiral type membrane element of this invention Process drawing which shows an example of the manufacturing method of the spiral type membrane element of this invention Front view showing an example of the spiral membrane element of the present invention Process drawing showing an example of a conventional method for manufacturing a spiral membrane element Partially broken perspective view showing an example of a conventional spiral membrane element

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Separation membrane 2 Supply side channel material 3 Permeation side channel material 4 Adhesive 5 Center pipe 6 Adhesive 23 Fiber cloth 23a Fiber cloth (extended part)
24 resin sheet 25 resin 25 'fiber reinforced resin 26 release sheet 27 hot melt adhesive R cylindrical wound body U separation membrane unit

Claims (3)

A step of forming a cylindrical wound body by spirally winding a separation membrane, a supply-side channel material, and a permeate-side channel material around a perforated central tube; and a supply-side fluid and a permeation side A method of manufacturing a spiral membrane element comprising a step of forming a sealing portion for preventing mixing of fluids,
Using at least one permeate-side channel material among the permeate-side channel materials, having a fiber cloth extended or connected to the rear end side of the winding and having a resin applied to the fiber cloth, When forming the cylindrical wound body, the fiber cloth is wound around the outer periphery of the cylindrical wound body together with a release sheet having releasability from the resin, and then the resin is cured, A method for producing a spiral-type membrane element, comprising a step of peeling the interface of the release sheet after curing and cutting the peeled portion. Using an adhesive having a thixotropic property in forming the sealing portion, the manufacturing method of the spiral membrane element of claim 1 wherein a resin of low viscosity from the adhesive as a resin to be applied to the fiber fabric . The viscosity of the adhesive is 5000 to 100000 mPa · s at 20 rpm using a BH viscometer using a # 6 rotor, and the viscosity of the resin applied to the fiber cloth is 100 to 10000 mPa · s under the same conditions. The method for producing a spiral membrane element according to claim 2, which is s.

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