JP2011093240A - Streaming laminate sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a streaming laminate sheet capable of transmitting fluid along a space between two sheets. <P>SOLUTION: The space between two sheets of plastic films 11, 11 arranged so as to face each other is made to be a fluid passage Z and a plastic wire-shaped body 13 formed in a mesh shape is arranged in the fluid passage Z, wherein the plastic wire-shaped body 13 is adhered to the two sheets of plastic films 11, 11 so as not to intercept the fluid passage Z. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flow-through laminated sheet used as a pipe for a fluid such as liquid or gas. More specifically, the present invention is composed of two plastic films arranged so as to face each other. The present invention relates to a flow-through laminated sheet that serves as a fluid flow path and allows fluid such as liquid or gas to flow in the surface direction of the sheet.

  Electrodialysis desalination of electrolyte solution was first developed in the 1950s for the purpose of desalination of brine. After that, seawater concentration for the production of salt, soy sauce and whey desalination, It is used for desalination from various electrolyte solutions such as rationalization of chemical manufacturing processes, wastewater treatment, and separation of impurities in wine.

  The electrodialysis apparatus used for electrodialysis as described above has a large number of chamber frames (also referred to as spacers) placed between a pair of electrodes, and between adjacent chamber frames, An anion exchange membrane or an cation exchange membrane is sandwiched, and the anion exchange membrane and the cation exchange membrane are alternately arranged as a whole, and each chamber frame is partitioned by the anion exchange membrane and the cation exchange membrane. (Energization part) will be formed. In such an ion exchange chamber, the chamber in which the cation exchange membrane is located on the negative electrode side and the anion exchange membrane on the positive electrode side is a desalination chamber, the anion exchange membrane is located on the negative electrode side, and the cation is on the positive electrode side. The chamber where the exchange membrane is located is a concentrating chamber, and the desalting chamber and the concentrating chamber are alternately arranged. That is, when energization is performed while circulating the treatment solution (electrolyte solution) in the desalting chamber, the cations in the treatment solution supplied to the desalting chamber pass through the cation exchange membrane and move to the adjacent negative electrode concentration chamber. Then, the anion in the treatment liquid passes through the anion exchange membrane and moves to the adjacent positive electrode-side concentration chamber. In this way, when the treatment solution is circulated and supplied to the desalting chamber and at the same time the aqueous salt solution is circulated to the concentration chamber, the desalination of the treatment solution is performed and at the same time, a concentrated solution having an increased salt concentration can be obtained. .

  As can be understood from the above description, each chamber frame has a communication hole serving as a flow path for the treatment liquid and the concentrated liquid, and a flow distribution portion that connects the communication hole and the desalination chamber or the concentration chamber. The liquid supply section for supplying the liquid to the desalting chamber or the concentration chamber and the liquid discharge section for discharging the liquid from the desalination chamber or the concentration chamber are both provided with such communication holes and flow distributions. Thus, the treatment liquid is circulated in the desalting chamber and the concentrated liquid is circulated in the concentration chamber.

  By the way, in the electrodialysis apparatus having the structure as described above, an ion exchange membrane (cation exchange membrane or anion exchange membrane) is sandwiched between the chamber frames, so that the anion exchange membrane in the distribution section In order to reliably prevent contact with the cation exchange membrane and to ensure a stable flow path in the distribution section, a resin net is placed inside the distribution section, but the ion exchange membrane covers the chamber frame. Therefore, there is a problem that liquid leakage from the distribution portion is likely to occur. That is, in the distribution portion, liquid leakage may occur from between the ion exchange membrane and the chamber frame. For example, a part of the liquid supplied to the desalting chamber may flow into the concentration chamber due to liquid leakage.

  In order to avoid such a problem, in Patent Document 1, a reinforcing sheet having a high elastic modulus is provided so as to block a part of the flow distribution portion (portion on the ion exchange chamber side) formed in the chamber frame (gasket). Has been proposed.

JP 2001-224930 A

  However, when the reinforcing sheet is provided as described above, the reinforcing sheet has high flexibility (elasticity), so that the reinforcing sheet falls on the net disposed in the distribution section, and in particular, adjacent ions If the fluid pressure in the exchange chamber is different and the fluid pressure in the ion exchange chamber on one side is high, the reinforcing sheet will bend together with the ion exchange membrane, making it difficult to effectively suppress fluid leakage. End up. For example, when deformation such as bending occurs, the liquid pressure in the distribution section acts to press the ion exchange membrane against the wall surface of the chamber frame, so there is a problem of liquid leakage from the distribution section to the adjacent ion exchange chamber. Although it does not occur so much, the liquid pressure in the ion exchange chamber acts in a direction to move the ion exchange membrane away from the wall surface of the chamber frame, so that liquid leakage from the ion exchange chamber to the adjacent distribution section occurs.

  The reinforcing sheet as described above is affixed to the chamber frame so as to close the distribution portion, and an ion exchange membrane is sandwiched between the adjacent chamber frames so as to cover the reinforcing sheet. Therefore, a step due to the presence of the reinforcing sheet is inevitably generated in the portion of the ion exchange membrane located on the distribution section, and a gap due to the step is easily formed. As a result, the above-described liquid leakage is likely to occur. The effect of preventing liquid leakage is low.

Furthermore, the reinforcing sheet is provided so as to cover the flow distribution portion, but a part of the reinforcing sheet must be prevented from protruding into the ion exchange chamber side or the communication hole. When the reinforcing sheet protrudes to the ion exchange chamber side, etc., this protruding portion is located in the space and is in a free state, so it is easily affected by the hydraulic pressure and is likely to bend due to the hydraulic pressure. This is because the reinforcing effect of the sheet is reduced. Therefore, it is necessary to attach the reinforcing sheet with high precision so as to cover only the distribution portion, and the problem that the attaching operation is extremely troublesome is also inherent.
In terms of performance, the method proposed in Patent Document 1 has a problem that the electrical resistance value is increased by increasing the thickness of the ion exchange chamber (interval between adjacent ion exchange membranes) by the thickness of the reinforcing sheet. There is also.

That is, an object of the present invention is to provide a flow-through laminated sheet that performs fluid transmission between two sheets.
Another object of the present invention is to be disposed in the communication hole formed in the chamber frame in the electrodialysis apparatus in particular, and it is possible to effectively prevent liquid leakage and perform liquid transmission. An object of the present invention is to provide a flow-through laminated sheet that can be disposed without increasing the thickness.

  According to the present invention, a space between two plastic films arranged so as to face each other is a fluid flow path, and a plastic filament formed in a mesh shape is formed in the fluid flow path. There is provided a flow-through laminated sheet, wherein the plastic linear body is adhered to the two plastic films so as not to block the fluid flow path.

In the flow-through laminated sheet of the present invention,
(1) The thickness of the plastic film is in the range of 10 to 1000 μm, and the space between the two plastic films forming the fluid flow path is in the range of 100 to 10000 μm.
(2) the porosity of the fluid channel is in the range of 10 to 90%;
(3) The plastic film is made of polyester or polyolefin, the rigidity value (stiffness) of the film is 10 N / m or more at 15 to 40 ° C., and the mesh-like filament is made of polyolefin.
(4) The mesh-like striated body is obtained by extrusion molding, and is composed of an upper striated line and a lower striated line intersecting each other, and the upper striated line and the lower striated line are integrally formed at the intersecting portion. The upper surface of the upper filament is bonded to the upper plastic film, and the lower surface of the lower filament is bonded to the lower plastic film,
(5) to be used in a liquid supply part or a liquid discharge part to an ion exchange chamber formed by two ion exchange membranes in an electrodialysis apparatus;
Is preferred.

  In the flow-through laminated sheet of the present invention, a mesh-like plastic filament (that is, a net) is disposed in a space serving as a fluid flow path between two plastic films. The wire is bonded and fixed to the filament so as not to block the fluid flow path. That is, this flow-through laminated sheet has a strong waist and high resistance to surface pressure because the entire surface direction of the plastic film is evenly supported by the filaments. For example, even when a pressure such as hydraulic pressure is applied to the plastic film in the surface direction, the deformation is effectively prevented, and therefore the disadvantage that the fluid flow path is closed by the pressure in the surface direction is effectively avoided. can do.

  That is, according to the present invention, the plastic film and the mesh-like linear body are bonded and integrated, and then cut into a flow-distribution part mold with high accuracy, whereby the plastic film and the mesh-like wire are obtained. Liquid leakage can be prevented without shifting from the strip.

  As understood from the above advantages, the flow-through laminated sheet of the present invention is used by being disposed in a liquid supply section or a liquid discharge section to an ion exchange chamber formed by two ion exchange membranes in an electrodialysis apparatus. It is most effective to be done. That is, by arranging this flow-laminated laminated sheet in the flow distribution section at the liquid supply section or the liquid discharge section, the ion exchange membranes that are sandwiched between the chamber frames so as to cover the flow-through laminated sheet and into the flow distribution section The drop can be effectively prevented and the liquid can be passed stably.

  In addition, the flow-laminated laminated sheet has a structure in which two plastic films are bonded so as to face each other with a net that has been conventionally arranged in the flow-distributing portion interposed therebetween. Unlike the conventionally known reinforcing sheet that is attached to the sheet, the sheet itself can be adhered and fixed to the inside of the flow distribution section. Therefore, if the size is set so as to match the size of the flow distribution section formed by overlapping the chamber frames, the level difference that causes liquid leakage like the reinforcing sheet will be formed on the surface of the chamber frame. It is not formed, and the overflow of the flow-through laminated sheet from the distribution part is effectively prevented. Furthermore, even if the flow-through laminated sheet fixed inside the flow distribution section protrudes from the flow distribution section to the ion exchange chamber side or the communication hole, the protruding plastic film is formed by the internal mesh-like filaments. Since it is held, there is an advantage that the influence of such a protrusion on the liquid leakage is extremely small.

  In addition, if the flow laminated sheet is set to the same size as the communication hole, a part of the side surface of the flow laminated sheet is spot-fitted by heat welding or adhesion using an adhesive. Can be fixed easily. In addition, as described above, this flow-through laminated sheet has a small influence on the liquid leakage from the protruding portion from the flow distribution section, so that its positional accuracy is not so required. Very easy.

  Furthermore, since the flow-through laminated sheet of the present invention has a mesh-like plastic filament disposed in the fluid flow path, the fluid flow is uniform with respect to the entire surface direction of the plastic film. In addition to the use in the electrodialysis apparatus as described above, the present invention is applied to various uses.

For example, since a plastic film surface becomes a heat transfer surface by flowing a coolant such as water or a heating medium such as heated steam in the fluid flow path, the heat exchange body for cooling or heating the flow-through laminated sheet Can be used as
Moreover, since the flow of the fluid in a fluid flow path becomes complicated along a linear body, it can also be used as a static mixer for mixing 2 types of gas or liquid, for example. That is, the two liquids to be mixed with each other are passed through the flow-through laminated sheet, so that the mixed liquid is automatically mixed without performing special stirring or the like.
Furthermore, if an antibacterial agent or the like is kneaded into the plastic forming the striatum, this flow-through laminated sheet can also be used as an air filter.

It is a disassembled perspective view of the flow-through laminated sheet of this invention. It is a side view of the flow-through laminated sheet of FIG. It is a figure which shows schematic structure of the die | dye used when extruding the linear body used for the flow-through lamination sheet of FIG. It is explanatory drawing for demonstrating the principle of the electrodialysis apparatus in which the flow-through lamination sheet of FIG. 1 is used. It is a disassembled perspective view of the principal part of the electrodialysis apparatus which performs the electrodialysis of FIG. It is a perspective view which expands and shows the communicating hole part of the chamber frame of the electrodialysis apparatus shown by FIG. It is a sectional side view of the principal part of the electrodialysis apparatus shown by FIG.

<Structure of flow-through laminated sheet>
Referring to the exploded perspective view of FIG. 1 and the side view of FIG. 2, the flow-through laminated sheet of the present invention, indicated as a whole by 10, has two plastic films 11 (the upper sheet is arranged so as to face each other). 11a, the lower sheet is indicated by 11b), and a mesh-like plastic linear body (ie, net) 13 positioned between them and bonded and fixed to each of the two plastic films 11, 11. It is composed of

  That is, the space A (see FIG. 2) between the two plastic films 11 is a flow path through which fluid flows, and the filament 13 is disposed in this space. Therefore, the filament 13 must be bonded to each of the two plastic films 11 so as not to block this flow path.

  The linear body 13 as described above can be produced by various methods, and is not particularly limited, for example, knitting or weaving of a thermoplastic resin thread (strand), but productivity and the plastic film 11 From the viewpoint of bonding strength, it is preferable to produce by integral extrusion molding of a thermoplastic resin. In FIG.1 and FIG.2, the filament 3 produced by integral extrusion molding of the thermoplastic resin is shown.

  Such integral extrusion can be performed by a known method described in, for example, Japanese Patent Publication No. 34-4185 and Japanese Patent Laid-Open No. 53-49170. As an example, as shown in FIG. 3, for example, the die mold provided at the tip of the extruder is composed of an outer mold 1 that can rotate relatively and a core mold 2 provided inside the outer mold. Use a structure. A plurality of grooves 1a serving as resin flow paths are formed on the inner surface of the outer mold 1 at appropriate intervals. On the other hand, a plurality of grooves 2a serving as resin flow paths are formed on the outer surface of the core mold 2 at appropriate intervals. Has been. Therefore, the mesh-like filament 13 is obtained by melt-extruding the resin while relatively rotating the outer mold 1 and the core mold 2 (usually rotating in opposite directions to each other). Can do. That is, the portion that is pushed out when the groove 1 a and the groove 2 a are matched becomes the bridging portion (intersection point) X of the linear body 13. According to such a method, by adjusting the rotational speed of the outer mold 1 and the core mold 2, the size of the opening of the filament 13 can be easily adjusted.

  The filaments extruded into a cylindrical shape as described above are cooled and solidified to stabilize the shape, and then taken up and cut. The cooling and solidification is performed, for example, by introducing it into water immediately after extrusion. At this time, it is preferable to place a cylindrical mandrel (sizing) in the water and perform extrusion so as to wrap the mandrel. In other words, by cooling and solidifying while pressing the molten cylindrical filament in the mandrel, the inner diameter of the cylindrical filament can be adjusted according to the outer diameter of the mandrel. For example, if the circumferential length of the cylindrical linear body is adjusted to an appropriate size according to the application, post-processing such as shape adjustment becomes easy. The take-up / cutting after being cooled and solidified in this way is carried out by a method known per se, whereby the sheet-like mesh-like filaments 13 can be obtained.

  By the way, the mesh-like linear body 13 obtained by the extrusion integral molding as described above is obtained by performing melt extrusion using the rotating outer mold 1 and the core mold 2 to join the molten resin flow. Therefore, the upper line 13a located on the upper side and the lower line 13b located on the lower side extend in a direction intersecting with each other, and the intersecting part is a bridging part X. Accordingly, in the flow-through laminated sheet 10 in which the linear body 13 having such a structure is bonded and fixed to the two plastic films 11, the upper surface of the upper linear line 13a is bonded to the lower surface of the upper plastic film 11a, and the lower side The lower surface of the filament 13b is bonded to the upper surface of the lower plastic film 11b. Accordingly, a mesh-like linear body 13 is provided between the two plastic films 11 so as not to block the flow path. In addition, in this case, the adhesive portion with the upper film 11a and the adhesive portion with the lower film 11b extend linearly so as to intersect with each other, and therefore, the entire surface of each plastic film 11 is uniformly meshed. The linear body 13 can be firmly bonded and fixed, and the fluid can pass through the entire annular flow path Z in which such a linear body 13 is provided.

In the case where the mesh-like line 13 is formed by weaving the strands, the lines that intersect each other extend in the same plane, and there is no difference in height between the two, but the intersecting portion (that is, the bridge) The tangle X) is thicker than the other parts. Therefore, when the linear body 13 is bonded and fixed between the two plastic films 11, the joint portions are the upper and lower surfaces of the bridging portion X, and are uniformly meshed across the entire surface of the plastic film 11. The body 13 can be fixed so as not to block the flow path A.
However, in the filament 13 obtained by strand weaving, the joint portions with the plastic film 11 are scattered, and therefore, from the viewpoint of the joint strength, the monolithic extrusion is more effective than such a filament. The filament 13 obtained by molding is more preferable.

In the present invention, the plastic material forming the film 11 and the striate body 13 may be a thermoplastic resin known per se, such as low density polyethylene, high density polyethylene, polypropylene, poly 1-butene, poly 4 methyl-1. -Olefin resins such as pentene or random or block copolymers of α-olefins such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, and cyclic olefin copolymers; ethylene / vinyl acetate copolymer Polymers, ethylene / vinyl alcohol copolymers, ethylene / vinyl copolymer resins such as ethylene / vinyl chloride copolymers; polystyrene, acrylonitrile / styrene copolymers, ABS, α-methylstyrene / styrene copolymers, etc. Styrene resin; polyvinyl chloride, polyvinylidene chloride, salt Vinyl resins such as vinyl chloride / vinylidene chloride copolymer, polymethyl acrylate, polymethyl methacrylate; amide resins such as nylon 6, nylon 6-6, nylon 6-10, nylon 11 and nylon 12; polyethylene terephthalate, Polyester resins such as polybutylene terephthalate and polyethylene naphthalate; polycarbonate; polyphenylene oxide; biodegradable resin such as polylactic acid; and the like can be used according to the application and required characteristics of the flow-through laminated sheet. . Of course, these thermoplastic resins can be used alone or in the form of a blend of two or more.
Moreover, in this thermoplastic resin, various additives may be mix | blended according to the use. For example, when this flow-through laminated sheet 10 is used as an air filter or the like, an antibacterial agent typified by a metal or a metal compound such as silver or silver oxide is appropriately added to the thermoplastic resin material for the filament 13. It is suitable to mix | blend in quantity.

  Moreover, the material which forms the plastic film 11 and the filament 13 may be the same, and may differ. When both are formed of the same material, it is not necessary to use an adhesive, and heat sealing (thermocompression bonding) with a sheet-like filament 13 sandwiched between two plastic films 11 Thus, both can be joined. When both are formed of different materials, an adhesive layer is appropriately formed on the adhesive side surface of the plastic film 11 by coating, coextrusion, etc., and in this state, heat sealing is performed in the same manner as described above. By performing the above, the intended flow-through laminated sheet 10 can be obtained. The adhesive to be used is not particularly limited, and an appropriate one is selected according to the material of the film 11 and the striated body 13, but generally an adhesive that can be easily bonded by heat sealing, for example, anhydrous An acid-modified olefin resin such as ethylene modified with an unsaturated carboxylic acid such as malein is used.

  In the flow-through laminated sheet 10 of the present invention, when used by being installed in a distribution part of a chamber frame of an electrodialysis apparatus to be described later, from the viewpoint of strength, etc., use at room temperature, particularly in the range of 15 to 40 ° C. It is preferable to use a plastic film 11 having a rigidity (stiffness) of 10 N / m or more at a temperature. As a material of such a plastic film 11, polyester or polyolefin represented by polyethylene terephthalate is suitable. In addition, from the viewpoint of cost, extrudability, and the like, a polyolefin-based resin is suitable as the material for the filament 13.

  In the present invention, the thickness d of the plastic film 11 and the distance d (corresponding to the thickness of the filament 13) between the two plastic films 11 serving as the flow path Z are not particularly limited. However, in general, the thickness of the film 11 is preferably in the range of 10 to 1000 μm, particularly 30 to 200 μm so that the above-described rigidity can be obtained depending on the material. . If the thickness is too thin, the flow-through laminated sheet 10 becomes weak, particularly when applied to an electrodialysis apparatus, the resistance to fluid pressure is reduced, and the ion exchange membrane support function is lowered. The pressure tends to cause the ion exchange membrane to fall into the communication hole, and liquid leakage tends to occur. Furthermore, it becomes easy to bend easily, cutting with a cutter etc. becomes difficult, and shape adjustment according to a use becomes difficult. Moreover, if this thickness is too thick, excessive pressure or heating is required, for example, during heat sealing, etc. As a result, the filament 13 itself may be crushed and the flow path Z may be blocked. Furthermore, the heat conductivity is lowered, and the use of the flow-through laminated sheet may be limited. For example, application as a heat exchanger becomes difficult.

  Further, the distance d between the two plastic films 11 is generally preferably in the range of 100 to 10,000 μm, particularly 30 to 2000 μm. That is, if the distance d (thickness of the striate body 13) is too small, the striate body 13 is crushed during heat sealing, the flow path Z is narrowed, and the flow of the fluid is deteriorated. The path Z may be blocked and the fluid may not flow. Furthermore, if the distance d is larger than the above range, there is no problem depending on the application. For example, when the flow-through laminated sheet 10 is applied to an electrodialyzer, this thickness is the thickness of the chamber frame used in the electrodialyzer. Therefore, when the ion exchange membrane is sandwiched between the chamber frames, a step is generated at the boundary between the flow distribution portion and the chamber frame, and this step is liable to cause liquid leakage.

In the present invention, the flow-through laminated sheet 10 in which the plastic film 11 having the thickness as described above is used and the interval d is set in the above range has a porosity (volume ratio) of the fluid flow path Z. It is preferable to be in the range of 10 to 90%, particularly 20 to 80%. That is, when the volume ratio is small, the flow of the fluid is lowered, and the transmission efficiency of the fluid through the sheet 10 may be lowered. Moreover, when the porosity is too large, the function of the mesh-like linear body 13 as a support decreases, and as a result of the rigidity of the film 11 decreasing, for example, when applied to an electrodialyzer, The ion exchange membrane falls into the communication hole due to the pressure, and liquid leakage is likely to occur.
Such adjustment of the porosity is easily performed by adjusting the size of the opening formed by the mesh-like filaments 13.

  In the flow-through laminated sheet 10 of the present invention having the above-described structure, the thickness, interval d, and porosity of the plastic film 11 are within the above-described ranges, and the Young's modulus of the laminated sheet 10 itself is 5 GPa or more, particularly It is preferable to set so as to be in a range of 6 GPa or more. That is, by making the Young's modulus in such a range and imparting rigidity, the deformation can be effectively prevented, excellent resistance to external pressure in the surface direction can be imparted, and flowability can be ensured. .

  Also, so-called plastic cardboard is known as a laminated body having a structure similar to the flow-through laminated sheet 10 of the present invention. Such plastic cardboard is used for allowing fluid to flow in the surface direction. Is inappropriate. That is, since this corrugated cardboard has a structure in which a corrugated plastic base sheet is provided between two plastic sheets, the space between the two plastic sheets is finely divided. As a result, it is possible to circulate the fluid, but the distribution performance is extremely low. Furthermore, the joints between the two plastic films and the corrugated plastic base sheet do not cross each other and extend in parallel, so the fluid flow is specified in one direction, depending on the application. When it is provided at a predetermined part, it is necessary to attach it in consideration of its direction, and the attaching operation may be extremely troublesome. Furthermore, the rigidity is lowered, and deformation is likely to occur. On the other hand, in the flow-through laminated sheet 10 of the present invention, since the plastic film 11 is bonded to the mesh-like linear body 13, the flow path Z between the two plastic films 11 is not divided. However, since the fluid flows through the entire flow path, the flow performance is extremely high, and the joint portion between the two plastic films 11 and the linear member 13 intersects each other to form a line. Therefore, the bonding strength is extremely high, and thus the rigidity is high. Furthermore, the flow of the fluid is not directional, and therefore there is an advantage that the work of attaching the flow-through laminated sheet 10 can be performed without considering the flow direction of the fluid.

  As described above, the flow-through laminated sheet 10 of the present invention described above is most preferably used by being provided in a communication hole formed in a chamber frame used for forming an ion exchange chamber of an electrodialyzer. Although suitable, it can also be used as a heat exchanger, a static mixer, an air filter or the like. In addition, when it is necessary to specify the inlet side and the outlet side of the fluid depending on the application or the attachment portion, the flow-laminated laminated sheet 10 is an upper film except for the inlet side and the outlet side portions. 11a and the lower film 11b can be overlapped to seal this portion.

  When the flow-through laminated sheet 10 of the present invention is used as a heat exchanger, the thickness of the plastic film 11 is in the range of 10 to 1000 μm, and the two fluid passages are formed. The space d between the plastic films 11 and 11 is preferably in the range of 0.1 to 10 mm. Moreover, when using as a heat exchanger, it is necessary to seal a part of opening part, and depending on the thickness, it can also be used in a multilayer. Such a heat exchanger can be suitably used for cooling a liquid such as an acid (sulfuric acid, hydrochloric acid, nitric acid) that may cause corrosion if it is made of metal (stainless steel, iron, etc.). .

Even when the flow-through laminated sheet 10 is used as a static mixer, the thickness of the plastic film 11 is preferably in the range of 10 to 1000 μm. The space distance d between the plastic films 11 is preferably in the range of 100 to 10,000 μm. Even in this case, it is necessary to seal the opening, and depending on the thickness, it is possible to use multiple layers.
Further, when the flow-through laminated sheet 11 is used as an air filter, it can be used in the same manner as when used as a static mixer. In this case, the net resin to be used contains an adsorbent or an antibacterial agent. Let it be used.

<Principle of electrodialyzer>
Hereinafter, the aspect at the time of applying the flow-through lamination sheet 10 of this invention to an electrodialysis apparatus is demonstrated.

  Referring to FIG. 4, in the electrodialysis apparatus, cation exchange membrane C and anion exchange membrane A are alternately arranged between negative electrode 20 and positive electrode 30, and an ion exchange chamber is provided between these ion exchange membranes. Is formed. That is, the ion exchange chamber is a desalting chamber 25 and a concentration chamber 27. As understood from FIG. 4, the desalting chamber 25 has a cation exchange membrane C and a positive electrode 30 with respect to the cation exchange membrane C. The concentration chamber 27 is composed of an anion exchange membrane A and a cation exchange membrane C located on the positive electrode 30 side with respect to the anion exchange membrane A. ing. Accordingly, a large number of desalting chambers 25 and concentration chambers 27 are alternately arranged.

In the electrodialysis apparatus having such a structure, for example, a voltage is applied between the positive electrode 30 and the negative electrode 20, a treatment liquid containing a salt such as NaCl is circulated and supplied to the desalting chamber 25, and the concentration chamber 27 is supplied to the concentration chamber 27. When the dilute electrolyte is energized while circulating, the cations (Na ⁺ ions) in the treatment liquid pass through the cation exchange membrane C to the concentration chamber 27 adjacent to the negative electrode 20 side. On the other hand, the anion (Cl ⁻ ) in the treatment liquid passes through the anion exchange membrane A and moves to the concentration chamber 27 adjacent to the positive electrode 30 side. In this case, although it depends on the characteristics of the anion exchange membrane, normally, the permeation of giant anions is prevented. In this way, desalting is performed from the processing solution circulated and supplied to the desalting chamber 25, and the salt concentration in the dilute electrolytic solution circulated and supplied to the concentration chamber 27 gradually increases. Eventually, it will be recovered as a highly concentrated aqueous salt solution.

When an exchange membrane having high monovalent selectivity is used as the cation exchange membrane C, for example, migration of polyvalent cations such as Ca ²⁺ contained in the treatment liquid to the concentration chamber 27 side is prevented. Only monovalent cations such as ⁺ ions can be selectively transferred to the concentration chamber 27 side, whereby high-purity monovalent salts can be recovered.

  In the electrodialysis performed in this way, it goes without saying that the treatment solution circulated and supplied to the desalting chamber 25 or the dilute electrolyte circulated and supplied to the concentration chamber 27 passes through the ion exchange membrane. Therefore, it is necessary to prevent leakage to the adjacent ion exchange chamber.

  Therefore, in the electrodialysis apparatus for effectively performing the electrodialysis as described above, as shown in FIG. 5, a large number of chamber frames 40 are arranged so as to overlap each other. The cation exchange membrane C or the anion ion exchange membrane A are alternately sandwiched so as to have the structure shown in FIG. 4, and the space in each chamber frame 40 is the above-described ion exchange chamber (desalting chamber 25 or It is a concentration chamber 27).

  Each chamber frame 40 has openings 41 and 41 for flowing the processing liquid supplied to the desalting chamber 25 and the processing liquid discharged from the desalting chamber 25, and a dilute electrolytic solution supplied to the concentration chamber 27 ( Alternatively, openings 43 and 43 are formed through which the electrolyte solution concentrated to increase the salt concentration) and the electrolyte solution discharged from the concentration chamber 25 flow.

  Further, the chamber frame 40 having a space serving as the desalting chamber 25 is formed with a flow distribution portion 45 that connects the communication hole 41 and the space serving as the desalting chamber 25. Similarly, a flow distribution portion 47 that connects the communication hole 43 and the space that becomes the concentrating chamber 25 is formed in the chamber frame 40 that has a space that becomes the concentrating chamber 27. That is, the liquid is supplied from these communication holes 41 and 43 to the desalting chamber 25 or the concentration chamber 27 through the distribution portions 45 and 47, and the liquid supplied to the desalination chamber 25 or the concentration chamber 27 is further supplied to the distribution portion. The structure is such that it is discharged and returned to the communication hole 41 or 43 through 45 or 47.

  Since the ion exchange membrane (cation exchange membrane C or anion exchange membrane A) is sandwiched between the chamber frames 40 as described above, this chamber frame 40 is a spacer for preventing contact between adjacent ion exchange membranes. As a function. Further, in order to allow the liquid to flow through the communication holes 41 and 43, the ion exchange membrane sandwiched between the chamber frames 40 is formed with openings 41 'and 43' corresponding to these.

  That is, by conducting current while circulating the treatment liquid and the diluted electrolyte as described above, desalting is performed in the desalting chamber 25, and the salt concentration of the liquid flowing through the concentration chamber 27 gradually increases. It will be followed.

  The flow laminated sheet 10 of the present invention described above is mounted in the flow distribution portions 45 and 47 of the chamber frame 40 described above, and the liquid flowing through the communication hole 41 or the communication hole 43 passes through the flow path Z of the sheet 10. The liquid supplied into the desalting chamber 25 or the concentration chamber 27 and simultaneously supplied to the desalting chamber 25 or the concentration chamber 27 is returned to the communication hole 41 or the communication hole 43 through the flow path Z of the sheet 10. It is.

  In FIG. 6 showing the distribution portion in an enlarged manner, the flow-through laminated sheet 10 attached to the distribution portion 45 (47) has substantially the same thickness, length and width as the chamber frame 40. It has a size substantially equal to (47), and is fixed to the flow distribution section 45 (47) by heat fusion by spot-heating the side surface.

  Further, referring also to the side sectional view of FIG. 7 in which the energization part (ion exchange chamber) of the electrodialyzer is shown, the ion exchange membranes C and A cover the flow distribution part 45 (47). Thus, the portion covering the flow distribution portion 45 (47) is supported by the flow-flowing laminated sheet 10. That is, when electrodialysis is performed by energization while circulating the treatment liquid and the diluted electrolyte, it is substantially the same that the liquid pressure in the desalting chamber 25 and the liquid pressure in the concentration chamber 27 are always set to be the same. In general, a pressure difference is generated between the two because of the difficulty. Therefore, such a differential pressure causes the ion exchange membranes C and A to bend, and as a result, the portion covering the flow distribution portion 45 (47) may fall into the flow distribution portion 45 (47). is there. When such a drop occurs, the liquid supplied into the desalting chamber 25 originally leaks into the adjacent concentrating chamber 27, or conversely, the liquid introduced into the concentrating chamber 27 enters the adjacent desalting chamber 25. May leak. Furthermore, the liquid in the desalination chamber 25 to be discharged from the flow distribution section 45 to the communication hole 41 leaks into the adjacent flow distribution section 47 or the liquid in the concentration chamber 27 to be discharged from the distribution section 47 to the communication hole 43. It may leak into the adjacent distribution section 45. When such leakage occurs, it is natural that the desalting efficiency by electrodialysis is reduced.

  However, in the present invention, the flow-distributing portion 45 (47) is provided with the high-flow-flow laminated sheet 10 and is configured so that the liquid flows through the flow path Z in the sheet 10. The drop of the ion exchange membranes C and A due to such a differential pressure can be effectively prevented.

  For example, the flow-through laminated sheet 10 of the present invention is not provided, a normal net is attached in the distribution section 45 (47), and a flexible reinforcing sheet is applied to the surface of the chamber frame 40 so as to cover the distribution section 45 (47). When it is attached to the sheet, the reinforcing sheet is flexible, so that the drop of the ion exchange membranes C and A due to the differential pressure cannot be effectively prevented. Further, even if a high-strength sheet is used as the reinforcing sheet, a step is generated in the ion exchange membranes C and A in the vicinity of the flow distribution portion 45 (47) due to the attachment of the reinforcing sheet. As a result, the aforementioned liquid leakage is likely to occur. However, in the present invention, the flow-through laminated sheet 10 has almost the same size as the distribution portion 45 (47) and is provided in the inside thereof, so that no step is generated in the ion exchange membranes C and A. Therefore, it is possible to effectively prevent liquid leakage due to such a step.

  Further, when the reinforcing sheet is attached to the chamber frame 40, if the reinforcing sheet protrudes to the ion exchange chamber 25 (27) side, the protruding part is in a free state. It is bent together with the ion exchange membranes C and A by the pressure, and does not show any reinforcing effect. However, in the present invention, even if the flow-through laminated sheet 10 protrudes from the distribution portion 45 (47), the plastic film 11 is firmly bonded and fixed to the filament 13, so that it protrudes due to the differential pressure. The portion does not bend, and the ion exchange membranes C and A can be firmly held in this portion, and the bending can be effectively prevented and liquid leakage can be surely prevented.

  The excellent effects of the present invention will be described by the following experimental examples, but the present invention is not limited to these examples.

<Example 1>
(Production of flow-through laminated sheets)
A cylindrical die was attached to the tip of a 65 mm extruder. This cylindrical die has an outer mold and a core mold as shown in FIG. 3 at the lower end, and the outer mold and the core mold rotate in opposite directions. While the high-density polyethylene was charged into the above-mentioned extruder and melted by heating at 170 to 210 ° C., extrusion through the cylindrical die was performed to extrude a cylindrical product of a continuous net downward. The extruded net was guided to a mandrel (sizing) in a water tank, cooled and solidified, and then opened in the extrusion direction to obtain a net mounted inside the flow-through laminated sheet. The obtained net had a thickness of 850 μm and a shielding rate per unit area of 60%.

  The resulting net is sandwiched between two polyester (PET) films (thickness of 50 μm, laminated with a hot melt adhesive) and heated to adhere at 100 to 120 ° C. to produce a flow laminated sheet (distribution plate). did. The space interval of the obtained flow-through laminated sheet is 840 μm, and the porosity of the fluid flow path is 80%.

(Preparation of ion exchange membrane)
A polyethylene microporous film with a thickness of 25 μm and 55 μm was added to a mixed solution consisting of 90 parts by weight of chloromethylstyrene, 10 parts by weight of divinylbenzene (57% product), 5 parts by weight of benzoyl peroxide, and 10 parts by weight of tributyl acetylcitrate. It was immersed and the mixed solution was filled in the voids of the microporous film. Subsequently, the microporous film was taken out from the mixed solution, and both sides of the microporous film were coated using a 100 μm polyester film as a release material, and then heat polymerization was performed at 80 ° C. for 8 hours. The obtained membrane was reacted in an aqueous trimethylamine solution at room temperature for 24 hours to obtain a quaternary ammonium type anion exchange membrane. The thickness of the obtained anion exchange membrane was 29 μm and 62 μm.

(Internal leakage test)
Using an Astro Co., Ltd. electrodialyzer asylizer AC02 (concentration chamber and desalination chamber is composed of 10 chambers each), remove the net in the distribution section and remove the flow-through laminated sheet cut out to the same size as the removed net. Installed. As the ion exchange membrane, the ion exchange membrane prepared as described above was incorporated. Next, water is passed through the electrodialyzer, and the inlet pressure of the fluid is adjusted to 0.05 MPa, 0.08 MPa, 0.10 MPa, and from the desalination chamber side to the concentration chamber side at each inlet pressure. The amount of water transfer was measured. The results are shown in Table 1. After the completion of each experiment, the ion exchange membrane was taken out and observed, and as a result, the generation of wrinkles caused by the drop of the ion exchange membrane into the distribution section was not observed, and the flatness was maintained.

<Comparative Examples 1-2>
An internal leakage test was performed in the same manner as in the example except that the flow distribution part was replaced with the existing net from the flow-through laminated sheet. The measurement results are shown in Table 1. After the completion of each experiment, the ion exchange membrane was taken out and observed, and as a result, wrinkles were generated due to the drop of the ion exchange membrane into the distribution section.

  Further, as a comparative example, even if the configuration is the same as in Example 1, when the film is placed on the net, the film and the net are likely to be misaligned, and leakage is likely to occur from the misaligned portion. . In addition, this method has poor work efficiency and it is difficult to produce a stable product.

<Example 2>
(Use as heat exchanger)
Using a polyethylene terephthalate film with a thickness of 50 μm and a polyethylene net with a thickness of 750 μm, a distribution laminated sheet was prepared. As a result of flowing the cooling water at 15 ° C. into the 200 mm × 200 mm inside of the produced distribution laminated sheet and measuring the temperature at the four corner surface portions of the distribution lamination sheet, the measurement temperatures of the four measurement points are within 1 ° C. Therefore, it was confirmed that the cooling water in the sheet was evenly distributed.

<Example 3>
(Use as a static mixer)
Similarly to Example 2, a flow-through laminated sheet was produced using a polyethylene terephthalate film having a thickness of 50 μm and a polyethylene net having a thickness of 750 μm. Two liquids different from the two directions on the inlet side, which is the longitudinal direction, were allowed to flow into the 300 mm × 100 mm inside of the produced distribution laminated sheet, and discharged from the outlet side on the side opposite to the inlet side. Different two liquids were colored by adding different indicators in advance, and it was confirmed that the two liquids discharged on the outlet side were uniformly stirred.

10: Flow-through laminated sheet 11: Plastic film 13: Mesh-like striate body Z: Fluid flow path C: Ion exchange membrane A: Anion exchange membrane 25: Desalination chamber 27: Concentration chamber 40: Chamber frames 41, 43: Communication hole 45, 47: Distribution section

Claims (6)

  A space between two plastic films arranged so as to face each other serves as a fluid flow path, and a plastic filament formed in a mesh shape is disposed in the fluid flow path. A flow-through laminated sheet, wherein the strip is bonded to the two plastic films so as not to block the fluid flow path.   2. The thickness of the plastic film is in a range of 10 to 1000 μm, respectively, and a space interval between two plastic films forming the fluid flow path is in a range of 100 to 10,000 μm. Flow-through laminated sheet.   The flow-through laminated sheet according to claim 1, wherein the fluid channel has a porosity of 10 to 90%.   4. The plastic film is made of polyester or polyolefin, the stiffness value (stiffness) of the film is 10 N / m or more at 15 to 40 ° C., and the mesh-like filament is made of polyolefin. The flow-through laminated sheet according to any one of the above.   The mesh-like striated body is obtained by extrusion molding, and is composed of an upper striated line and a lower striated line that intersect each other, and the upper striated line and the lower striated line are integrally connected at the intersecting portion. The flow path according to any one of claims 1 to 4, wherein an upper surface of the upper filament is bonded to a plastic film positioned above, and a lower surface of the lower filament is bonded to a plastic film positioned below. Laminated sheet.   The flow-through laminated sheet according to any one of claims 1 to 5, wherein the flow-through laminated sheet is provided in a liquid supply unit or a liquid discharge unit to an ion exchange chamber formed by two ion exchange membranes in an electrodialysis apparatus.

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