JP4219161B2 - Spiral type membrane element and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spiral membrane element that separates specific components present in various fluids (liquid or gas) and a method for manufacturing the same. More specifically, the present invention relates to an improvement in a method for forming a sealing structure near both side edges of a film.
[0002]
[Prior art]
A conventional spiral membrane element is a perforated hollow tube comprising a set of laminated bodies (membrane leaves) in which three sides are sealed in a bag shape with a permeate-side channel material interposed on the permeate side of two membranes. There has been known a structure in which the connected laminated body is wound in a spiral shape with a supply-side channel material interposed therebetween. Also known is a method using a plurality of laminated bodies (film leaves) in order to shorten the flow path length on the permeate side.
[0003]
The basic structure of the latter is that a laminated body in which a supply-side channel material is arranged on the membrane supply side and a permeation-side channel material is arranged on the permeation side is spirally wound around a perforated hollow tube. The one having a sealing structure for preventing the passage and the permeate-side flow path from communicating directly is generally used. More specifically, a single or a plurality of laminates of a membrane material group including a bi-fold membrane leaf sandwiching the supply-side channel material on the separation layer side of the membrane and a permeate-side channel material adjacent thereto are provided. What was wound around the hollow tube of a hole is already well-known (for example, refer patent document 1).
[0004]
As a manufacturing method of such a spiral membrane element, as shown in FIGS. 6A to 6C, first, a membrane leaf 3 composed of a folded membrane 1 and a supply-side channel material 2, and a permeate-side channel The material 4 is placed in an overlapping manner, and this is shifted by a certain distance (the length obtained by dividing the outer peripheral length of the hollow tube 5 by the number of the membrane leaves 3) to produce a laminated body. A method of winding around the empty tube 5 is employed. FIG. 6 illustrates a form in which the film leaves 3 are not continuous independently (single leaves), but a form in which the films 1 of the film leaves 3 are continuous is also known.
[0005]
As a method of sealing so that the supply-side flow path and the permeation-side flow path of such a membrane element do not communicate with each other, normally, before winding the membrane leaf, both side edges of the membrane leaf and the tip of the membrane leaf A method in which a two-component mixed urethane resin or the like is applied as an adhesive to the (winding end portion) and is allowed to cure in a stationary state after winding. However, the mixed resin has various problems as follows. First, since the mixed resin is viscous, wrinkles may occur due to material misalignment that occurs during winding, and the sealing performance may be incomplete. Second, when a mixed resin is used, man-hours and material (resin) costs increase. Third, the mixed resin is hardened immediately after mixing and the time until the end of winding is limited.
[0006]
Further, as a technique for using a heat-fusible material for sealing, as shown in FIGS. 7A to 7B, on both side edges and the tip of the separated channel material (permeation side channel material 4). A method is known in which a hot-melt type tape-like adhesive T is temporarily fixed and adhered to the separation membrane 1 by irradiation with electromagnetic waves (see, for example, Patent Document 2). According to this method, there is no problem of material misalignment due to the viscosity of the mixed resin, and an adhesive application step is not required, and the process time can be shortened.
[0007]
[Patent Document 1]
US Pat. No. 3,417,870 (first page, FIG. 2)
[Patent Document 2]
JP-A-7-204471 (2nd page, FIG. 3)
[0008]
[Problems to be solved by the invention]
However, in the method using the tape-like adhesive, as shown in FIG. 7A, the tape-like adhesive T is temporarily fixed on the surface of the permeate-side flow path member 4 and is not sufficiently impregnated inside. Even if the fusion is performed, as shown in FIG. 7B, the resin is not sufficiently filled in the gap portion of the permeate-side channel material 4, and bubbles or nests 4a are formed in the central portion of the permeate-side channel material 4. Tends to remain. When the permeation-side flow path and the supply-side flow path communicate with each other through the nest 4a, the sealing performance of the sealing structure is impaired, and the membrane separation performance is degraded. In addition, in the winding process and the like, there is a problem that the tape-like adhesive is easily dropped and turned up, and management of temporary fixing conditions and winding conditions becomes complicated.
[0009]
Accordingly, an object of the present invention is to provide a spiral membrane element capable of greatly improving the sealing performance of the sealing structure and simplifying the manufacturing process while taking advantage of the use of the heat-fusible material, and the manufacturing thereof. It is to provide a method.
[0010]
[Means for Solving the Problems]
  The above object can be achieved by the present invention as follows..
[0011]
  That isThe spiral membrane element manufacturing method of the present invention includes a step of forming a laminate in which a supply-side channel material is disposed on the membrane supply side and a permeation-side channel material is disposed on the permeation side, and at least the laminate is provided. In a method for manufacturing a spiral membrane element, comprising a step of spirally winding around a hollow tube of a hole, and a step of forming a sealing structure for preventing the supply-side channel and the permeate-side channel from communicating directly with each other. In forming a sealing structure in the vicinity of both side edges of the film,Molten by heatingHeat fusible materialPermeate side channel materialIn the gapBy impregnation and solidification, pre-filled with heat-fusible material so that it protrudes from the surface of the permeate-side channel material., Its heat-fusible materialHeat againA sealing structure is formed by heat fusion to the film. In the above, after forming a laminated body using the permeation-side flow path material filled with the heat-fusible material, the laminate is wound around and heated in the state after the winding to heat the heat-fusion. It is preferable to wear.
[0013]
    [Function and effect]
  BookAccording to the manufacturing method of the invention, in forming the sealing structure near both side edges of the film, the permeation-side flow path material in which the gap portion is previously filled with the heat-fusible material is used, and the heat-fusible material is In order to form a sealing structure by heat-sealing to the film, compared with the method of heat-sealing with a tape-like adhesive temporarily fixed to the permeate-side flow path material as in the conventional method, Since bubbles and nest removal hardly remain, the sealing performance of the sealing structure can be greatly improved. In addition, problems such as a drop in yield due to falling off and turning of the tape-like adhesive are reduced, and management of temporary fixing conditions and winding conditions can be simplified. In addition, since a sealing structure is formed using a heat-fusible material, there are many advantageous aspects in the manufacturing process as compared with a sealing structure using a mixed resin (two-component adhesive).
[0014]
After forming a laminated body using a permeate-side channel material filled with the heat-fusible material, the laminate is wound around the hollow tube and heated in the state after the winding to perform the heat-sealing. In the case of winding, since it is not heat-sealed, the winding process can be performed smoothly, and since the gap is filled with the heat-fusible material in advance, a sufficient seal can be obtained by heating in the wound state. Sex can be secured. In the conventional method using a tape-like adhesive, it is advantageous to heat-seal before winding in order to ensure the sealing performance, but there are problems such as generation of wrinkles in the winding process. May occur.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A to FIG. 3B are process diagrams schematically showing an example of a method for manufacturing a spiral membrane element of the present invention. In this embodiment, after forming laminated body S1 using the permeation | transmission side flow path material 4 filled with the heat-fusible material 11, it winds around the hollow tube 5, and heats in the state after winding. An example of performing heat fusion is shown.
[0016]
As shown in FIGS. 1A to 2B, the production method of the present invention is a laminate in which a supply-side channel material 2 is disposed on the supply side of the membrane 1 and a permeation-side channel material 4 is disposed on the permeation side. Forming the body S1. In the present embodiment, as shown in FIGS. 2A to 2B, the continuous membrane 1 is used, and the supply-side channel material 2 is transmitted to the supply side of the alternately folded film 1 and transmitted to the transmission side. The example which arrange | positions the side channel material 4 is shown.
[0017]
First, as shown in FIG. 1A, both ends of a continuous film 1 are partially heat-sealed (densified) to form a fused portion 1a. Although this step can be omitted, in order to improve the sealing performance of the sealing structure in the vicinity of both side edges of the film 1, it is preferable to perform heat fusion in advance. As the continuous film, for example, a width of 500 to 2000 mm, preferably a width of 900 to 1200 mm is used. In this case, heat fusion (heat sealing, ultrasonic welder, etc.) is continuously performed with a width of 50 mm or less between the regions of 100 mm from both ends while feeding it from the roll. Preferably, heat fusion is performed with a width of 30 mm or less between regions of 30 mm from both ends.
[0018]
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 for permeation. Specifically, a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane, Examples include reverse osmosis membranes, ion exchange membranes, gas separation membranes, and dialysis membranes. As the material of the membrane, a polymer membrane such as polyolefin such as polypropylene or polyethylene, polysulfone, polyethersulfone, polystyrene, polyacrylonitrile, cellulose acetate, polyamide, polyimide, fluororesin, or the like can be used. The membrane 1 may have a reinforcing layer such as a porous support layer. In that case, the permeate-side flow path member 4 is generally disposed on the reinforcing layer side.
[0019]
Next, as shown in FIG. 1 (b), the heat-fusible material 11 is filled in the voids in the vicinity of both side edges (sealing structure forming position) of the permeation-side channel material 4. As the permeation side channel material 4, any conventionally known permeation side channel material can be used as the spiral membrane element, and any of net, mesh, wire woven fabric, fiber woven fabric, non-woven fabric, etc. may be used. Further, the material may be any of natural polymers, rubbers, metals, etc., in addition to resins such as polypropylene, polyethylene, polyethylene terephthalate (PET), polyamide, epoxy, and urethane. However, when elution from the channel material becomes a problem during the separation operation or the like, it is preferable to select the material in consideration thereof.
[0020]
The thickness of the permeate side channel material 4 is preferably 0.2 to 1 mm, and the porosity in the thickness direction of the permeate side channel material 4 is preferably 10% or more and 60% or less. Moreover, when the permeation | transmission side flow-path material 4 is net shape, it is preferable that the pitch is 0.3 mm or more and 5 mm or less.
[0021]
The heat-fusible material 11 may be any material that is solid at room temperature and can be fused by heating, such as ethylene / vinyl acetate copolymer (EVA), polyethylene, polyurethane, acrylic resin, terpene resin, rosin resin, Other thermoplastic resins, thermoplastic elastomers, mixtures thereof, etc. can be used in addition to hot melt adhesives such as
[0022]
As a filling method, any of a method of impregnating and solidifying a material in a molten state, a method of removing a solvent after impregnating a material in a solution state, a method of filling and melting a fine particle material inside may be used. However, from the viewpoint of reliably filling the gaps in the permeate-side flow path material 4, a method of impregnating and solidifying the molten material is preferable, and the molten material is extruded into the permeate-side flow path material 4 and developed. A material such as a tape or string may be impregnated by heating with a mold or another heater.
[0023]
In the present invention, in particular, as shown in FIG. 4A, two permeating rolls 21 having molding grooves 21a that are continuous in the circumferential direction are opposed to each other, and the permeation-side channel material 4 is passed between the rotating rolls 21. A method of impregnating the heat-fusible material 11 in a molten state (or a softened state) is preferable. At this time, the solid heat-fusible material 11 may be brought into a molten state (or a softened state) by heating with a roll 21 or a heater. In particular, heat is applied to the permeate-side channel material 4 before passing the roll 21. A method of spreading and impregnating the fusible material 11 in a molten state is preferable.
[0024]
According to this method, as shown in FIG. 4 (b), the expanded heat-fusible material 11 a is impregnated into the permeate-side flow path material 4, and this passes between the rolls 21, thereby forming the forming groove. The heat-fusible material 11 having a thickness and width corresponding to the depth and width of 21a is formed.
[0025]
The thickness in the state where the heat-fusible material 11 is filled is preferably 0 to 1.0 mm, particularly preferably 0 to 0.5 mm, higher than the surface of the permeate-side channel material 4. If it is thinner than this, the sealing property after heat fusion tends to be insufficient, and if it is thicker than this, the loss of the effective film area due to the spread of the heat-fusible resin, etc. There is a tendency that the looseness of winding due to the spread of the film causes insufficient sealing performance after heat fusion.
[0026]
Next, as shown in FIG. 1C, the permeation-side flow path member 4 is temporarily fixed on the permeation side (lower side of the drawing) of the membrane 1. As a temporary fixing method, any of a method of partially heat-sealing the heat-fusible material 11 and a method of using a temporary fixing tape may be used, but the heat-fusible material 11 is partially heat-sealed. The method is preferred. It is preferable to carry out the heat-sealing conditions at a lower temperature than in the subsequent fusion process.
[0027]
Next, as shown in FIG. 1 (c), the reinforcing adhesive tape 12 has a width of 10 to 100 mm at an equal interval on the supply side (upper side of the drawing), a length of 500 to 2000 mm, etc. Attach it so that there are no wrinkles in the width direction at intervals. Preferably, the adhesive tape 12 having a width of 10 to 50 mm is attached at regular intervals of 500 to 1500 mm in the length direction. The adhesive tape 12 may be any PET tape. This is the portion that becomes the mountain fold side and the valley fold side when folded continuously.
[0028]
In the present invention, when the film 1 is folded, it is preferable that grooves, creases, compacted lines, perforations, and the like are formed in advance along the folding line of the film 1. As a specific forming method, for example, there is a method in which a linear or perforated blade or rotary blade is pressed and sandwiched from the upper side as a receiving side, for example, a grooved mold, a grooved roll, or a pair of rolls. .
[0029]
Next, as shown to Fig.2 (a), when the supply side flow-path material 2 of width 500-2000mm, for example, preferably 900-1200mm is cut | disconnected to 500-2000mm, and the adhesive tape 12 is affixed, for example The supply-side channel material 2 is fixed alternately. The fixing method includes heat fusion, staple, tape, resin, etc., but an ultrasonic welder is preferable.
[0030]
As the supply-side channel material 2, any conventionally known supply-side channel material can be used as the spiral membrane element, and any of a net, a mesh, a wire woven fabric, a fiber woven fabric, a nonwoven fabric, a grooved sheet, a corrugated sheet, and the like may be used. . The material may be any of natural polymers, rubber, metals, etc., in addition to resins such as polypropylene, polyethylene, polyethylene terephthalate (PET), polyamide and the like. However, when elution from the channel material becomes a problem during the separation operation or the like, it is preferable to select the material in consideration thereof.
[0031]
The thickness of the supply-side channel material 2 is preferably 0.3 mm or more and 2 mm or less, and the porosity in the thickness direction of the supply-side channel material 2 is preferably 10% or more and 70% or less. Moreover, when the supply side flow-path material 2 is net shape, it is preferable that the pitch is 0.5 mm or more and 10 mm or less.
[0032]
Next, as shown in FIG. 2B, the substantially central portion of the portion of the adhesive tape 12 to which the supply side flow path member 2 is fixed is folded back so that the supply side flow path member 2 is inside. It is folded back by the set leaf to obtain a laminate S1. The folding can be performed using a hand or a jig, or using an apparatus that automates the folding. The number of set leaves is, for example, 15 to 50 leaves for an 8-inch size. At this time, the folded portion on the side sandwiching the permeate-side flow path member 4 is not folded.
[0033]
At the time of the above, it is preferable to perform heating and pressurization when the film 1 is folded or after folding in order to stabilize the crease, maintain the shape, and increase the strength. Specifically, a method of sandwiching the folded portion using a pair of heating plates, a method of passing between a pair of heated rolls, a method of pushing the folded portion into a heating body in which a gap capable of holding the folded portion is formed, etc. It is done. This heating and pressurization may be performed at the time of folding or after folding, or at the time of folding and after folding, but it is preferable to hold the heating and pressing state for a certain time after folding.
[0034]
In this invention, as shown to Fig.3 (a)-(b), it has the process of winding this laminated body S1 around the perforated hollow tube 5 spirally. In the present embodiment, an example in which winding is performed after the winding start side of the laminate S1 is directly fixed or fixed to the hollow tube 5 is shown.
[0035]
First, as shown in FIG. 3 (a), the winding start portion corresponding to the first membrane 1 to which the permeation-side flow path member 4 is temporarily fixed is fixed to the hollow tube 5, and each leaf is attached to the circle of the hollow tube 5. It is fixed or arranged at an interval according to the circumference.
[0036]
As the hollow tube 5, any conventionally known tube can be used. For example, it may be a perforated hollow tube made of metal, fiber reinforced plastic, plastic, ceramics, or the like. Any known hole shape, size, position, number, etc. may be employed depending on the type of film.
[0037]
The outer diameter and length of the hollow tube 5 are appropriately determined according to the size of the spiral membrane element. For example, the outer diameter is 10 to 100 mm and the length is 500 to 2000 mm, preferably the outer diameter is 12 to 38 mm and the length is 900 to 1200 mm. In this example, the hollow tube 5 is a permeate-side flow channel (for example, a water collection tube).
[0038]
As a method of fixing the laminated body S1 (membrane leaf) to the hollow tube 5, in addition to heat fusion and ultrasonic fusion, adhesion by an adhesive, adhesion tape, double-sided tape, adhesion by a heat fusion material, mechanical Any fixing may be used. The fixing sites can be corrected by the arrangement of the film or the like, not necessarily at regular intervals, but are preferably at substantially regular intervals. In the case of substantially equal intervals, it is preferable to set the interval obtained by dividing the outer peripheral length of the hollow tube 5 by the number of membrane leaves to be fixed.
[0039]
Next, a spiral winding process is performed. As shown in FIG. 3B, the hollow tube 5 is rotated while the single or plural rolls 15 are pressed against the outer periphery of the wound body R1. It is preferable to perform the times.
[0040]
As a method of rotating the hollow tube 5, a conventional winding device can be used. The hollow tube 5 may be set and rotated on a winding chuck. The rotation speed is, for example, 10 mm / min to 50 m / min as the peripheral speed of the outer peripheral portion of the wound body R1.
[0041]
In the above case, the roll 15 may be any one that is rotatable or has a rotational braking force or driving force, but is preferably one that is rotatable or has a minute braking force. In the present invention, the laminate S1 may be wound to the end by the winding process as described above, but the hollow tube is pressed while pressing one or more rolls 15 with a stronger pressure during or after the winding. You may implement the process of rotating 5 and winding wound body R1. In the case of the continuous leaf type as in the present embodiment, it is possible to temporarily fold the outer peripheral side of the leaf by winding to the end. In the above-described tightening step, the tightening state can be controlled by controlling the pressure and speed. In addition, you may wind an exterior sheet | seat around the wound body R1 after winding.
[0042]
The present invention includes a step of forming a sealing structure for preventing the supply-side channel and the permeate-side channel from communicating directly with each other. As shown in FIG. In forming the stopper structure A1, the permeation-side flow path material 4 in which the heat-fusible material 11 is filled in the gap portion in advance is used, and the heat-fusible material 11 is heat-sealed to the film 1 to provide a sealing structure. Form.
[0043]
In the present embodiment, the heat sealing is performed by heating in the state of the wound body R1 after winding. Although the heat fusion conditions depend on the type of the heat-fusible material 11, the heating temperature is preferably 90 to 160 ° C, more preferably 110 to 130 ° C. The heating time is preferably 30 to 90, although it depends on the heating temperature. In addition to the method of performing direct heating, heat fusion may be performed by a method of heating using electromagnetic waves such as microwaves and high frequencies, infrared rays, and other energy rays. A method using electromagnetic waves is described in detail in JP-A-7-204471.
[0044]
In the present invention, a sealing structure other than the sealing structure A1 may be further formed, but this step can be performed in the same manner as in the conventional method. This step may be performed at any time, and may be performed in a plurality of steps. For example, a step of forming the sealing structure A2 by sealing a portion closer to the hollow tube 5 on the inner peripheral side than the sealing structure in the vicinity of both side edges of the membrane 1 may be performed separately. Further, when using a plurality of membrane leaves without using a continuous membrane, a step of sealing the outer edge of the membrane 1 may be performed. Regarding the sealing process of the sealing structure A2, in addition to heat fusion and ultrasonic fusion using a heat fusion tape, adhesion by an adhesive, adhesive tape, double-sided tape, adhesion by a heat fusion material, etc. are carried out. May be. For the latter sealing step, in addition to these methods, the above-described method using the permeation-side channel material 4 in which the heat-fusible material 11 is previously filled in the gap is effective. This will be described in detail later.
[0045]
In addition, after winding, in order to remove the residual stress of the sealed portion that has been heat-sealed, heat treatment is performed at an appropriate temperature, or the winding process is heated at a temperature at which heat-sealing etc. is not separated. You may go while. Further, after the winding step, an outer peripheral channel material such as a net may be wound around the outer peripheral surface of the film 1.
[0046]
The spiral membrane element of the present invention can be suitably manufactured by the manufacturing method of the present invention. That is, as shown in FIG. 3 (c), the laminated body S1 in which the supply-side channel material 2 is arranged on the supply side of the membrane 1 and the permeation-side channel material 4 is arranged on the permeation side becomes a perforated hollow tube 5. In the spiral membrane element wound in a spiral shape and having a sealing structure for preventing the supply-side flow path and the permeation-side flow path from communicating directly, the sealing structure A1 in the vicinity of both side edges of the film 1 In this structure, the membrane 1 is heat-sealed by a heat-fusible material 11 that is filled in the gap portion of the permeate-side channel material 4 so as to communicate with the front and back. Specific materials, shapes, structures, etc. are as described above.
[0047]
[Other Embodiments]
(1) In the above-mentioned embodiment, after forming a laminated body using the permeation | transmission side flow path material filled with the heat-fusible material, it winds to a hollow tube and heats in the state after winding. Although an example in which heat sealing is performed has been described, a sealing structure may be formed by performing heat sealing before winding around a hollow tube.
[0048]
(2) In the above-described embodiment, an example of winding a continuous leaf using a continuous film as a laminated body has been shown. However, in the present invention, a plurality of single leaves are prepared and a laminated body is formed using the single leaf. Later, this may be wound around a hollow tube. Alternatively, only one set of long single leaves may be used and wound around a hollow tube.
[0049]
In that case, as a method for sealing the outer side edge of the film, the method using the permeation-side flow path material in which the gap portion is previously filled with the heat-fusible material is effective. For example, as shown in FIG. 5, the supply side channel material 2 is used by filling the heat-sealable material 11 in the portions corresponding to the both sides of the membrane leaf and the tip of the membrane leaf of the transmission side channel material 4. A bifold membrane leaf sandwiched between the membrane 1 and the supply side of the membrane 1 is inserted and fixed between the two permeation-side flow path members 4, wound around the central tube, and then heat-sealed. Also in this case, after the heat-sealable material 11 is continuously filled on both sides of the permeate-side channel material 4 by the method using the same roll as described above, and further, the heat-sealable material 11 in the width direction is filled. By cutting, the permeation-side flow path material 4 in which the heat-fusible material 11 is previously filled in the gaps in the vicinity of the three sides can be produced.
[0050]
(3) In the above-described embodiment, an example in which the permeation-side flow path material is fixed to the porous sheet so that the hollow tube is used as the permeation-side flow path has been described. In some cases, the supply-side channel material may be fixed to the porous sheet so that the hollow tube serves as the supply-side channel.
[0051]
(4) In the above-described embodiment, an example in which a permeation-side flow path material is disposed on the permeation side of the continuous membrane, and then a supply-side flow path material is disposed on the supply side, and this is alternately folded to form a laminate. As shown, the order of arrangement and the order relationship with folding may be any.
[0052]
【Example】
Examples and the like specifically showing the configuration and effects of the present invention will be described below.
[0053]
Example 1
In accordance with the steps shown in FIGS. 1 (a) to 3 (b), a spiral membrane element was produced under the following materials and conditions, and evaluated.
[0054]
While the RO membrane ES10 manufactured by Nitto Denko Corporation was fed out, heat sealing was continuously performed on both side edges. Moreover, the hot-melt resin (manufactured by Ashara Chemical Co., Ltd., EVA) is impregnated so that the thickness from the surface of the permeate-side channel material (tricot type, polyester resin) is 0.1 mm by passing between the rolls -Filled. This was partially heated and temporarily adhered to the permeate side surface of the membrane. The tape was affixed across the width direction at equal intervals on the supply-side film surface at the fold line. After affixing the tape, a metal thin plate was applied to the crease, and a load was applied to the receiving side with a mold, and the supply side was scored in the direction of the valley. A supply-side channel material cut to a required size was prepared, and the supply-side channel material was fixed to the portion where the tape was applied as a fold portion with an ultrasonic welder. The substantially central portion of the tape portion to which the supply-side flow path material was fixed was bent, and bent by the number of set membrane leaves. At this time. The opposite folded portion (supply side mountain fold side) was not folded. In order to increase the strength of the crease, hot pressing was performed with air pressure. In this way, a laminate was prepared.
[0055]
A hollow tube was set in the winding chuck of the assembly assembled as described above, and the entire membrane leaf was wound up by rotating the chuck at a constant speed. At this time, the roll was applied to the element with a constant pressure from two directions to align the end faces. In the case of the continuous leaf type, the outer peripheral side was temporarily folded. After rotating a certain number of times, one roll was further applied and tightened. At this time, there were no wrinkles, folds or deviations in the membrane leaf.
[0056]
The wound element was allowed to stand in a dryer at 130 ° C. for 1 hour to fuse the hot melt resin, and then returned to room temperature and solidified. As for the element that had been solidified, air permeation was performed on the permeate side of the leaf from the central tube in water at a pressure of 0.05 MPa, and as a result of checking the sealing performance, no bubbles were observed from the supply side. Further, as a result of measuring the film characteristics, the predetermined film performance was satisfied.
[Brief description of the drawings]
FIG. 1 is a process chart schematically showing an example of a method for producing a spiral membrane element of the present invention.
FIG. 2 is a process chart schematically showing an example of a method for producing a spiral membrane element of the present invention.
FIG. 3 is a process diagram schematically showing an example of a method for producing a spiral membrane element of the present invention.
4 is a process diagram showing a part of the process shown in FIG. 1 in more detail.
FIG. 5 is an explanatory view showing another example of the manufacturing method of the spiral membrane element of the present invention.
FIG. 6 is a process diagram schematically showing an example of a conventional method for manufacturing a spiral membrane element.
FIG. 7 is an explanatory view showing a heat-sealed state of a conventional method for manufacturing a spiral membrane element.
[Explanation of symbols]
1 Membrane
2 Supply-side channel material
4 Permeation side channel material
5 Hollow tube
11 Heat-sealable material
S1 Laminate
R1 roll
A1 Sealing structure near both sides of the film

Claims (3)

A step of forming a laminated body in which a supply-side channel material is arranged on the supply side of the membrane and a permeation-side channel material is arranged on the permeate side, and a step of winding at least this laminate in a spiral shape around a perforated hollow tube And a method of manufacturing a spiral membrane element having a step of forming a sealing structure so that the supply-side channel and the permeate-side channel do not directly communicate with each other.
In forming a sealing structure in the vicinity of both side edges of the membrane, a permeation-side flow path material is obtained by impregnating and solidifying a void portion of the permeation-side flow path material with a heat-fusible material that has been melted by heating. Spiral type film characterized by pre-filling a heat-fusible material so as to protrude from the surface of the film and heating the heat-fusible material again to heat-fuse the film to form a sealing structure Element manufacturing method.   After forming a laminated body using a permeate-side flow path material filled with the heat-fusible material, the laminate is wound around the hollow tube and heated in the state after the winding to perform the heat-sealing. The method for producing a spiral membrane element according to claim 1. While passing through the permeation-side passage material between two rolls having molding grooves circumferentially continuous, by Rukoto impregnated with heat-fusible material, the thickness corresponding to the depth and width of the forming groove The method for manufacturing a spiral membrane element according to claim 1 or 2, wherein the heat-fusible material is formed.

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