JP2008272692A - Filter and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter which prevents the generation of scratches while keeping surface catching and washing properties and is highly durable against repetitive pressures by washing. <P>SOLUTION: The filter comprises: a filter body 3 which is the material of a large diameter and provided with pores of a large diameter; a microfiltration membrane 5 provided on the outer side or inner side of the filter body 3, which is the material of a diameter smaller than the filter body 3 and provided with micropores finer than the filter body 3; and a protective film 7 provided on the outer side or inner side of the microfiltration membrane 5, which is the material of the diameter larger than the microfiltration membrane 5 and provided with the pores of the diameter larger than the microfiltration membrane 5 and is the material of the diameter equal to or smaller than the filter body 3 and provided with pores finer than the filter body 3. The respective layers of the filter body 3, the microfiltration membrane 5 and the protective film 7 are joined with each other by the joining technique of bonding or heat fusion or the like. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter and a method for manufacturing the same, and more particularly to a filter used in a filtration device for separating fine dust from a gaseous or liquid fluid and a method for manufacturing the same.

  Conventionally, as a collecting means for separating and filtering fine dust from a gaseous or liquid fluid, bag-shaped bag filters and pleat filters made of fibers such as cloth, cellulose, felt, and resin particles are melted on the surface. A filter element made of a continuous porous molded body (sintered body) that is attached and sintered is known.

  However, the former bag filter is supported by a retainer, and the surface pores are minute and uniform, so the surface collection is excellent and the collected dust can be easily removed. When back pressure is repeatedly applied to the bag filter to remove it, the bug filter will be broken due to friction with the retainer, and fine dust accumulates in the bag filter, resulting in one to six years. There was a problem that clogging occurred in the degree and the air volume decreased. In the latter filter element, the size of the pores of the sintered body is about 1/4 to 1/5 of the diameter of the resin particles. For example, since pores of about 10 μm are formed for a resin particle diameter of 50 μm, only large particles of dust can be collected. If the diameter of the resin particles is reduced to reduce the size of the holes, there is a problem that the air resistance increases.

  Therefore, in order to solve the above-mentioned problem, the first conventional filter includes a strong support and fine particles at a position of ¼ to 2/3 of the filter thickness from the inner wall of the filter. The microfiltration layer which becomes is laminated. A filter corresponding to this is disclosed in Patent Document 1. Further, the cylindrical filter of Patent Document 2 is a glass in which a heat-fusible conjugate fiber is wound on the inner layer portion of the filter and has a fiber diameter thinner than the fiber diameter of the heat-fusible conjugate fiber over the upper layer portion. A glass fiber nonwoven fabric layer made of fibers is inserted, the glass fiber nonwoven fabric layer is inserted into the circumferential surface of 1/3 to 4/5 of the thickness from the inner surface of the filter, and the porosity is 96% or more, The thickness is 10-50% of the filter thickness.

  Moreover, as a filter of the 2nd prior art example, the fine particle is affixed on the surface of the filter main body which has intensity | strength as a microfiltration layer by joining techniques, such as adhesion | attachment. For example, in the filters of Patent Documents 3 to 5, for example, fluororesin is used as a microfiltration layer on the surface of a continuous porous molded body (sintered body) obtained by fusing and sintering resin particles such as polyethylene on the surface. Alternatively, it is a sintered filter formed by adhering a coating layer of fine particles of other resin or the like with, for example, an adhesive. That is, the pores of the sintered body become a large number of small gaps due to fine particles such as fluororesin.

  As a third conventional filter, a porous sheet (or a porous film) such as a PTFE membrane (polytetrafluoroethylene) is pasted as a microfiltration layer on the surface of a strong filter body. . For example, in the filter of Patent Document 6, for example, a porous sheet (or film) having fine pores is adhered to the surface of a continuous porous molded body (sintered body) obtained by sintering resin particles such as polyethylene. It is a sintered body filter attached to the surface by a method such as fusion. Examples of the porous sheet include porous sheets (or porous films) such as PE polyethylene, PP polypropylene, and PTFE membrane.

As another filter of the third conventional example, a fine hole is formed on the surface of a filter body made of cloth-like fibers such as a relatively thick nonwoven fabric having a diameter of several μm to several hundred μm. A sheet (or film) made of very thin fibers such as a porous film or a microfiber film is attached as a microfiltration layer.
JP 56-49605 A Japanese Patent No. 3677836 Japanese Patent No. 3330153 JP-A-11-262613 JP-A-11-276824 JP-A-8-173727

  By the way, the first conventional filter has a short life because supplementary particles such as dust collected by the microfiltration layer are obstructed by the support and cannot be removed even if back pressure cleaning or pulse cleaning is performed. There was a problem.

  Further, in the second conventional filter, the microfiltration layer made of fine particles is bonded and formed on the surface layer of the filter body with a thickness of several μm to several tens of μm. The air permeability and liquid permeability can be recovered by back pressure cleaning and pulse cleaning, but when the filter is manufactured, the surface is easily damaged by a jig or the like. In addition, during handling of the filter, for example, during back pressure cleaning or pulse cleaning, peeling of the microfiltration layer is likely to occur due to insufficiently adhered portions or the above scratches. Furthermore, there has been a problem that peeling of the microfiltration layer occurs even when the adhesive layer deteriorates due to aging.

  In the third conventional filter, the surface layer to which a porous sheet (or porous film) such as a PTFE membrane or Teflon (registered trademark) is attached is thin with a thickness of several μm to several tens of μm. There was a problem of being easily scratched. Moreover, since said porous sheet (or porous film) has weak adhesive strength, peeling may occur by back pressure washing or pulse washing. When this peeling occurred, the film strength was weak due to the thin film thickness, which sometimes broke. Further, there is a problem that the filter is easily damaged during handling.

In order to achieve the problem to be solved by the above invention, a filter of the present invention is a large-diameter material and a filter body having large-diameter pores,
A microfiltration membrane provided on the outside or the inside of the filter body, a material having a smaller diameter than the filter body, and a microfiltration membrane having finer pores than the filter body,
A protective membrane provided outside or inside the microfiltration membrane, having a larger diameter than the microfiltration membrane and having pores larger in diameter than the microfiltration membrane and having the same or smaller diameter as the filter body It is composed of a material and a protective film having pores smaller than the filter body, and
The filter main body, the microfiltration membrane, and the protective membrane are bonded to each other by a bonding technique such as adhesion or heat fusion.

The filter of this invention is a large-diameter material and a filter body having large-diameter pores,
A first protective film provided outside or inside the filter body, the first protective film having the same or a small diameter as the filter body and having pores smaller than the filter body;
A microfiltration membrane provided outside or inside the first protective membrane, the microfiltration membrane having a smaller diameter than the first protective membrane and having finer pores than the first protective membrane; ,
A second protective membrane provided on the outside or inside of the microfiltration membrane, having a diameter larger than that of the microfiltration membrane and having pores larger in diameter than the microfiltration membrane and being equivalent to the filter body Or a small-diameter material and a second protective film having pores finer than the filter body, and
The filter main body, the first protective film, the microfiltration film, and the second protective film are bonded to each other by a bonding technique such as adhesion or heat fusion.

  In the filter of the present invention, the filter main body is a sintered body having a large-diameter resin and large-diameter pores, or a large-diameter material and a coarse mesh base cloth-like body. It is preferable that it is the cylindrical body comprised by winding at least 1 layer or more.

  In the filter of the present invention, it is preferable that in the filter, the microfiltration membrane is an adhesive layer made of a fine particle material, or a porous membrane or a microfiber membrane having micropores.

  In the filter of the present invention, the protective film is preferably coated with a resin having dust releasability.

  Moreover, the filter of this invention WHEREIN: It is preferable that the said protective film is thickness of 10 micrometers-1000 micrometers in the said filter.

The filter manufacturing method of the present invention is a large-diameter material, and forms a filter body having large-diameter pores,
By spraying a fine particle material on the outside or inside of this filter body with an adhesive, a material having a smaller diameter than the filter body and forming a microfiltration membrane having finer pores than the filter body,
On the outside or inside of the microfiltration membrane, a material having a diameter larger than that of the microfiltration membrane, and having a pore having a diameter larger than that of the microfiltration membrane, and a material having the same or a small diameter as the filter body, and the filter body A protective film having finer pores is bonded by a bonding technique such as adhesion or heat fusion.

The filter manufacturing method of the present invention is a large-diameter material, and forms a filter body having large-diameter pores,
In advance, the material of the protective film having the same or smaller diameter as that of the filter body and having pores smaller than that of the filter body, and having fine pores smaller than that of the protective film and smaller than that of the protective film. A protective membrane with a microfiltration membrane is constructed by bonding the microfiltration membrane with a bonding technique such as adhesion or heat fusion.
The protective membrane with a microfiltration membrane is bonded by a bonding technique such as adhesion or heat fusion so that the microfiltration membrane contacts the outside or the inside of the filter body.

The filter manufacturing method of the present invention is a large-diameter material, and forms a filter body having large-diameter pores,
A first protective film having a pore equivalent to or smaller in diameter than the filter main body and having pores smaller than the filter main body in advance, a material having a smaller diameter than the first protective film, and the first protective film A microfiltration membrane having a finer pore and a second protective membrane under the same conditions as the first protective membrane are sequentially joined as a sandwich structure by a bonding technique such as adhesion or heat fusion. Construct a protective film with
The protective film with a microfiltration membrane is bonded by a bonding technique such as adhesion or heat fusion so that the first protective film is in contact with the outside or the inside of the filter body.

  Further, the filter manufacturing method of the present invention is the above filter manufacturing method, wherein the microfiltration membrane is formed by spraying a fine particle material with an adhesive, or a porous membrane or microfiber membrane having micropores. It is preferable to form.

  In the method for producing a filter according to the present invention, it is preferable that the filter body is formed of a sintered body having a large diameter resin and having large diameter pores.

  Also, the filter manufacturing method of the present invention is the above filter manufacturing method, wherein the filter main body is a cylinder having a large diameter material and a coarse mesh base cloth-like body wound around at least one layer around a rotating shaft. It is preferable to form in a shape.

  In the filter manufacturing method of the present invention, it is preferable that the protective film is coated with a resin having dust releasability on the protective film.

  Moreover, the manufacturing method of the filter of this invention WHEREIN: It is preferable that the said protective film is formed in thickness of 10 micrometers-1000 micrometers in the manufacturing method of the said filter.

  As will be understood from the means for solving the above problems, according to the filter of the present invention, the surface of the microfiltration membrane is held by the protective membrane, so that the microfiltration membrane by back pressure cleaning or pulse cleaning is used. Can be prevented from being damaged or peeled off over a wide range.

  In addition, since the surface of the microfiltration membrane is held by the protective membrane, there is no direct contact between the microfiltration membrane and, for example, a manufacturing jig in the filter manufacturing process. The situation can be prevented.

  In addition, when attaching or removing the filter to a dust collector or filtration device, even if the filter is accidentally bumped against another object, it does not directly hit the microfiltration membrane, and the protective membrane is only scratched. There is no reduction.

  In addition, since the microfiltration membrane is held by a strong protective film, the force applied to the microfiltration membrane during back pressure cleaning and pulse cleaning can be dispersed, so that the filter is hardly deteriorated even when the filter is used for a long time. Moreover, the microfiltration membrane can be prevented from being broken to a minimum extent.

  Further, according to the filter of the present invention, in addition to the effect of the filter described above, since the both sides of the microfiltration membrane have a sandwich structure sandwiched between the first protective film and the second protective film, When pressure is generated from either side of the microfiltration membrane during pulse cleaning or normal filtration, either the first protective membrane or the second protective membrane against this pressure It can be reliably supported. The lifetime of the filter can be improved.

  Further, according to the filter manufacturing method of the present invention, since the protective film is provided on the surface of the microfiltration membrane, the manufacturing jig does not directly contact the microfiltration membrane in the filter manufacturing process. It is possible to prevent a situation where the filter membrane is damaged. Furthermore, it is possible to prevent scratches, scratches, and the like during handling.

  In addition, according to the filter manufacturing method of the present invention, since the microfiltration membrane is previously formed on one surface of the protective membrane, the characteristics of the microfiltration membrane can be confirmed in advance at this time, so that the stability of quality can be improved. it can. In addition, since the microfiltration membrane is formed on the uniform plane of the protective membrane, the microfiltration membrane is uniform and stable. As a result, the filtration performance is improved. Moreover, there is almost no material loss for expensive microfiltration membranes.

  Also, according to the filter manufacturing method of the present invention, a protective membrane with a microfiltration membrane having a sandwich structure in which both surfaces of the microfiltration membrane are sandwiched between the first protective membrane and the second protective membrane in advance. In addition to the effects similar to those of the filter manufacturing method described above, even if pressure is generated from either side of the microfiltration membrane when back pressure cleaning, pulse cleaning, or normal filtration is performed, It is possible to make a long-life filter that is reliably supported by either the first protective film or the second protective film against pressure.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIGS. 1 (A) and 1 (B), the filter 1 according to this embodiment is basically made of a material having a large diameter filter body 3 having strong strength for supporting the filter 1 itself. And it has large diameter pores. A microfiltration membrane 5 for separating and filtering fine dust from a gaseous or liquid fluid is provided outside or inside the filter body 3. A protective film 7 for protecting the microfiltration membrane 5 is provided outside or inside the microfiltration membrane 5. Further, the layers of the filter main body 3, the microfiltration membrane 5, and the protective membrane 7 are bonded to each other by a bonding technique such as adhesion or heat fusion.

  Examples of the adhesive used at this time include vinyl resin, phenol resin, melanin resin, resorcinol resin, acrylonitrile resin, and urethane resin. Moreover, when heat-sealing each said layer, it carries out at the heating temperature of 100-250 degreeC, for example.

  The protective film 7 is a material having a smaller diameter than the filter body 3 and has pores finer than the filter body 3, and the microfiltration membrane 5 is a material having a smaller diameter than the protective film 7, and It has fine pores finer than the protective film 7.

  Moreover, in the external pressure type which filters from the periphery of the filter 1 toward the center, each layer of the microfiltration membrane 5 and the protective film 7 is provided in order on the outer side of the filter body 3, but from the center of the filter 1 to the periphery. In the internal pressure type that filters toward the inside, the layers of the microfiltration membrane 5 and the protective membrane 7 are sequentially provided inside the filter body 3.

  Next, various specific embodiments will be described in more detail based on the basic configuration described above in the filter 1 of the embodiment of the present invention.

The filter 9 of the first embodiment, the above-mentioned filter body 3, a particle diameter D ₁ of several tens μm~ several hundred μm in the resin which is a material, the particle size of more specifically 50μm or more resins A relatively coarse particle is used which is composed of a sintered body 11 composed of D ₁ skeleton particles and having pores with a diameter d ₁ of 25 to 100 μm. For example, the particle diameter _{D 1} of the resin is sintered bodies 11 of 50μm or more PE (polyethylene).

The manufacturing method of the filter 9 of the first embodiment will also be described. As shown in FIG. 1A, the microfiltration membrane 5 is made of, for example, Teflon (registered trademark). of 10μm particulate material 13 consisting of the particle diameter D ₂ of the following resins by blowing with adhesive on the outside or inside of the filter body 3, the porous membrane is formed having the following diameters d ₂ of the micropores 5μm Is done.

Since this porous film is a Teflon (registered trademark) material, the adhesion of the dust is weak, so the collected dust is likely to fall. The porous membrane is not limited to the above-mentioned Teflon (registered trademark) material, and may be made of other materials such as polyethylene, polypropylene, and cellulose. Also, specifically, a sub-micron (10μm~0.1μm) from the particle diameter _{D 2} microns.

  Further, as described above, the protective film 7 is attached to the surface of the microfiltration membrane 5 formed outside or inside the filter body 3 as described above so as to shift from the state of FIG. 1A to FIG. 1B. The filter 9 is completed by being attached and joined by a joining technique such as adhesion or heat fusion.

  At this time, the protective film 7 selects a thickness and a mesh size that do not prevent the trapped particles collected by the microfiltration membrane 5 from being separated from the microfiltration membrane 5 by back pressure cleaning or pulse cleaning. For example, the thickness is preferably 20 μm or more, and preferably 100 mesh or more. In this embodiment, it is made of a thin film having a thickness of, for example, 10 μm to several hundred μm made of a material such as a nonwoven fabric.

  The protective film 7 is coated with Teflon (registered trademark) or the like, so that the protective film 7 itself can improve the peelability of the collected matter such as dust.

  Further, as another manufacturing method of the filter 9 of the first embodiment, as shown in FIG. 2A, the surface on one side of the protective film 7 similar to that of the above-described embodiment is previously provided. Similarly to the above-described embodiment, the fine particle material 13 is sprayed with an adhesive, or the PTFE film 15 or the microfiber film 17 is pasted and bonded by a bonding technique such as adhesion or heat fusion, so that the microfiltration membrane 5 is used. The protective film 19 with a microfiltration membrane is created.

  Next, the microfiltration membrane 5 is brought into contact with the outside or the inside of the filter body 3 so that the protective membrane 19 with the microfiltration membrane shifts from the state of FIG. 2A to FIG. 2B. The filter 9 is completed by bonding with a bonding technique such as adhesion or heat fusion.

  In this case, when the microfiltration membrane 5 is formed on one surface of the protective membrane 7, the characteristics of the microfiltration membrane 5 can be confirmed in advance, so that the quality can be improved stably. This point is particularly effective when the microfiltration membrane 5 is formed using the fine particle material 13. Further, since the fine particle material 13 can be uniformly coated on a wide uniform surface of the protective film 7, there is an advantage that the loss of the fine particle material 13 is reduced, in other words, there is almost no material loss for the expensive microfiltration membrane. . As a result, the filtration performance is improved.

  Incidentally, when the fine particle material 13 is sprayed on the surface of the filter main body 3 as shown in FIG. Intrusion may occur and problems such as close clogging may occur. In particular, when the unevenness of the surface of the filter body 3 is large, it is difficult to uniformly attach the fine particle material 13, so that the thickness of the microfiltration membrane 5 varies greatly. These problems can be solved by forming the microfiltration membrane 5 on one surface of the protective film 7 in advance as shown in FIGS.

  Also, the PTFE membrane 15 has fine pores with a diameter of 10 μm or less, and since it is a Teflon (registered trademark) material, the adhesion of dust is weak, so the collected dust is likely to fall. is there. The PTFE film 15 is not limited to the above-mentioned Teflon (registered trademark) material, but may be made of other materials such as polyethylene, polypropylene, and cellulose. Specifically, the pore diameter is from micron to submicron (0.01 μm to 10 μm).

  The microfiber membrane 17 has a fiber diameter of 10 μm or less and a hole with a diameter of 10 μm or less. For example, a non-woven fabric of a microfiber membrane such as Teflon (registered trademark), polyethylene, polypropylene, cellulose, etc. It is a sheet made of a sheet-like object such as, and is relatively inexpensive. By performing a surface treatment, heat resistance and flame retardancy can be easily added, and dust releasability can be improved. Specifically, the fiber diameter is 0.01 to 10 μm.

  With the above-described configuration, the filter 9 (that is, the filter 1) of the first embodiment is arranged so that the microfiltration membrane 5 is outside even if the microfiltration membrane 5 is peeled off from the filter body 3 during back pressure cleaning or pulse cleaning. Or since it is hold | maintained by the protective film 7 from the inner side, the microfiltration membrane 5 can be prevented from being damaged or peeled off in a wide range.

  Further, since the protective film 7 is provided on the outer side or the inner side of the microfiltration membrane 5, for example, a manufacturing jig does not directly contact the microfiltration membrane 5 in the manufacturing process of the filter 9. Thus, it is possible to prevent a situation in which the weakly weak microfiltration membrane 5 is damaged. Furthermore, it is possible to prevent scratches, scratches, and the like during handling.

  In addition, when the filter 9 is attached to and removed from the dust collector or the filtration device, even if the filter 9 is accidentally hit against the frame of the above device, it does not directly hit the thin precision filtration membrane 5 and scratches the protective membrane 7. Therefore, the performance of the filter 9 is not deteriorated.

  In addition, since the pressure of back pressure cleaning or pulse cleaning is directly applied to the microfiltration membrane 5, when used for a long period of time, conventionally, the microfiltration membrane 5 was torn due to fatigue or peeled off from the filter body 3. However, in the filter 9 of this embodiment, since the microfiltration membrane 5 is held by the strong protective film 7, the force applied to the microfiltration membrane 5 can be dispersed. There is almost no deterioration. Moreover, the microfiltration membrane 5 can be prevented from being broken to a minimum range.

  Next, the filter 21 according to the second embodiment will be described. Note that differences from the filter 9 of the first embodiment described above will be mainly described, and the same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  3 and 4, in the filter 9 of the first embodiment described above, the filter body 3 is the sintered body 11, but in the filter 21 of the second embodiment, the filter body 3 has a large diameter. This is a cylindrical body formed by winding the base cloth-like body 23 having a coarse mesh in at least one layer. For example, the filter 21 in FIG. 3 is a cylindrical body formed by winding the base cloth-like body 23 into four layers, and the filter 21 in FIG. 4 is a so-called single-layer structure in which only one layer of the base cloth-like body 23 is wound. This is a cylindrical body composed of the base cloth-like body 23.

  The basic structure of the filter body 3, the microfiltration membrane 5, and the protective membrane 7, and the layers of the microfiltration membrane 5 and the protective membrane 7 are substantially the same as those of the filter 9 of the first embodiment described above. It is.

More specifically, the base cloth-like body 23 constituting the filter body 3 has a diameter of, for example, 5 to 300 μm and a pore diameter of 10 μm (corresponding to a density of nonwoven fabric of 0.4 to 0.6 g / cm ³ ) to 1000 μm (nonwoven fabric). The non-woven fabric 23A having a density of 0.05 to 0.07 g / cm ³ ), and this non-woven fabric 23A is wound into one layer or a plurality of layers and formed into a cylindrical shape. The cylindrical thickness, that is, the total thickness of one layer or a plurality of layers of the nonwoven fabric 23A is 1.0 to 5.0 mm.

  In addition, as nonwoven fabric 23A, materials, such as PP (polypropylene), PE (polyethylene) containing low density polyethylene and high density polyethylene, or the mixture of PP and PE, are used. Other resins used include polyolefins such as propylene and other α-olefins and copolymers, polyesters such as polyethylene terephthalate, copolymerized polyesters and low melting point plastic polyesters, and polyamides such as nylon 6 and nylon 66. Or a synthetic resin made of a thermoplastic resin such as polystyrene, vinyl chloride, thermoplastic elastomer, or a mixture thereof.

  Moreover, the multiple layers of the nonwoven fabric 23A are joined by a joining technique such as adhesion or heat fusion. Since adhesion and heat fusion at this time are the same as those described in the filter 1 of the above-described embodiment, detailed description thereof is omitted.

The protective film 7 is as described above. In the second embodiment, for example, the diameter is 10 to 100 μm, and the pore diameter is 5 μm smaller than the nonwoven fabric 23A as the base cloth-like body 23 (with the density of the nonwoven fabric). A nonwoven fabric 7A having a thickness of 0.5 to 0.7 g / cm ³ ) to 400 μm (corresponding to a density of the nonwoven fabric of 0.1 to 0.12 g / cm ³ ) is used. In addition, as said nonwoven fabric 7A, since the raw material of resin similar to the nonwoven fabric 23A mentioned above is used, detailed description is abbreviate | omitted.

  Further, as the microfiltration membrane 5, the fine particle material 13 is sprayed with an adhesive, or a PTFE membrane 15 or a microfiber membrane 17 having fine pores of 5 μm or less finer than the nonwoven fabric 7A is adhered or adhered. The microfiltration membrane 5 is formed by bonding with a bonding technique such as heat fusion. Note that the fine particle material 13, the PTFE film 15, and the microfiber film 17 are the same as those of the filter 9 of the above-described embodiment, and thus detailed description thereof is omitted.

  The adhesion and thermal fusion between the nonwoven fabric 7A as the protective film 7 and the microfiltration membrane 5 are the same as those described in the filter 9 (1) of the above-described embodiment, and thus detailed description thereof is omitted. .

Further, the manufacturing method of the filter 21 according to the second embodiment will be described. Similarly to the case described with reference to FIG. 1, the fine particle material 13 is sprayed on the surface of the filter body 3 with an adhesive so as to be 5 μm or less. microfiltration membrane 5 is formed of a porous membrane having micropores of diameter d _2.

  Next, the protective film 7 is affixed to the surface of the microfiltration membrane 5 and bonded by a bonding technique such as adhesion or heat fusion, whereby the filter 21 is completed.

  Further, another manufacturing method of the filter 21 according to the second embodiment will be described. Similarly to the case described with reference to FIG. 2, fine particles are previously formed on the surface of one side of the protective film 7 similar to that of the above-described embodiment. Protection with a microfiltration membrane is formed by spraying the material 13 with an adhesive, or by attaching a PTFE membrane 15 or a microfiber membrane 17 and bonding them with a bonding technique such as adhesion or heat fusion to form the microfiltration membrane 5 A film 19 is created.

  Then, a pre-configured protective membrane 19 with a microfiltration membrane is wound by one layer so that the microfiltration membrane 5 is in contact with the outside of the filter body 3 and bonded by a bonding technique such as adhesion or heat fusion. As a result, as shown in FIGS. 5A and 5B, the cylindrical filter 21 is completed. Note that the length L of the cylindrical filter 21 is, for example, 10 to 5000 mm.

  At this time, adhesion and thermal fusion between the filter main body 3 and the protective film 19 with the microfiltration membrane are the same as those described in the filter 9 (1) of the above-described embodiment, and thus detailed description thereof is omitted. .

  When joining the above layers by bonding or heat fusion, generally, the layers of the filter body 3 are first joined, and then the protective film 19 with a microfiltration membrane is joined to the filter body 3. . However, the layers of the filter body 3 and the protective film 19 with a microfiltration membrane can be bonded simultaneously.

  Here, as shown in FIGS. 5A and 5B, the protective film 19 with a microfiltration membrane is wound around the outside of the filter body 3, but the protective membrane 19 with a microfiltration membrane is It may be wound inside the filter body 3. That is, in the external pressure type in which the filter is filtered from the periphery of the cylindrical filter 21 toward the center, the protective film 19 with a microfiltration membrane is wound around the outside of the filter body 3, but from the center of the filter 21 toward the periphery. In the internal pressure type for filtering, the protective membrane 19 with a microfiltration membrane is wound inside the filter body 3. For example, after the protective membrane 19 with a microfiltration membrane that is configured in advance is wound around a drive roll as a rotating shaft, for example, by one layer and joined with a wrap margin, outside the protective membrane 19 with a microfiltration membrane, The base cloth-like body 23 is wound in one layer or a plurality of layers to form the filter body 3. At this time, the protective film 19 with a microfiltration membrane and the base cloth-like body 23 wound around the drive roll are preliminarily coated with an adhesive and are pressed from the outside with a pressure-bonding roll or pressed and heated with a heating roll. Heat-sealed.

  In both the external pressure type and the internal pressure type, the protective film 19 with a microfiltration membrane is wound so that the side of the microfiltration membrane 5 is in contact with the filter body 3. That is, the protective film 19 is positioned on the outermost side or the innermost side to hold the microfiltration membrane 5.

  Since the operation and effect of the filter 21 of the second embodiment manufactured as described above are substantially the same as those described in the filter 9 of the first embodiment described above, detailed description thereof is omitted.

  Further, the filter 21 of the second embodiment described above is a hollow cylindrical filter as shown in FIG. 5B, for example, but the cylindrical filter 21 is bent to form, for example, a hollow cylinder. Can be transformed into a hollow star-shaped cylindrical star-shaped filter having a star-shaped cross section, a rectangular filter having a generally rectangular cross-section with a corrugated plate, or other pleated filters having a cross-sectional shape. it can.

  As a method for forming the pleated filter, for example, a star column mold having a star-shaped cross section is inserted into the hollow cylinder of the filter 21. Next, by applying heat and applying pressure from the periphery of the filter 21 using a sheet metal working machine such as a press working machine, the filter 21 is pressed against the outer periphery of the mold of the star column and bent. It can be performed.

  Next, a filter 25 according to another embodiment of the present invention will be described. Note that differences from the filter 1 of the above-described embodiment will be mainly described, and the same members are denoted by the same reference numerals and detailed description thereof will be omitted.

  6A and 6B, the difference between the filter 25 and the filter 1 of the above-described embodiment is that the configuration of the microfiltration membrane 5 and the protective membrane 7 provided outside or inside the filter body 3 is different. It is in. That is, the basic structure of the filter 25 is that the first protective film 7B having the same conditions as the protective film 7 is provided on the outer side or the inner side of the filter body 3, and the outer side of the first protective film 7B or A microfiltration membrane 5 is provided on the inner side, and a second protective film 7 </ b> C having the same conditions as the protective membrane 7 is provided on the outer side or the inner side of the microfiltration membrane 5. In other words, a protective film 27 with a microfiltration membrane having a sandwich structure in which both surfaces of the microfiltration membrane 5 are sandwiched between the first protective film 7B and the second protective film 7C is provided outside or inside the filter body 3. It has been.

  The layers of the filter main body 3, the first protective film 7B, the microfiltration film 5 and the second protective film 7C are bonded to each other by a bonding technique such as adhesion or heat fusion. Since the adhesion and heat fusion are the same as those described in the filter 9 (1) of the above-described embodiment, detailed description thereof is omitted.

  Next, various specific embodiments will be described in more detail based on the basic configuration described above in the filter 25 of the embodiment of the present invention.

  A filter 29 and a manufacturing method thereof according to the third embodiment will be described. Note that differences from the filter 9 of the first embodiment described above will be mainly described, and the same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  6A and 6B, as the filter body 3 of the filter 29, the sintered body 11 similar to that of the first embodiment is used. Further, as shown in FIG. 6A, the first implementation is performed on the surface of one side of the first protective film 7B under the same conditions as the protective film 7 of the first embodiment described above. The fine filtration membrane 5 is formed by spraying the fine particle material 13 with an adhesive in the same manner as in the above embodiment, or bonding the PTFE film 15 or the microfiber film 17 by a bonding technique such as adhesion or thermal fusion. Next, a second protective film 7C having the same conditions as those of the protective film 7 of the first embodiment is attached to the surface of the microfiltration membrane 5 and bonded by a bonding technique such as adhesion or heat fusion. Then, a protective membrane 27 with a microfiltration membrane is prepared.

  Next, the first protective film 7B is brought into contact with the outside or the inside of the filter body 3 so that the protective film 27 with the microfiltration membrane shifts from the state of FIG. 6A to FIG. 6B. The filter 29 is completed by being attached in this manner and joined by a joining technique such as adhesion or heat fusion.

  From the above, the manufacturing method of the filter 29 is to manufacture the protective film 27 with a microfiltration membrane having a sandwich structure in which both surfaces of the microfiltration membrane 5 are sandwiched between the first protective film 7B and the second protective film 7C in advance. By doing so, the same effects as the manufacturing method of the first filter 9 described above, for example, it is possible to improve the quality of the microfiltration membrane 5 stably, reduce the material loss for expensive microfiltration membrane, The effect is obtained.

  Moreover, the manufactured filter 29 has a sandwich structure in which both sides of the microfiltration membrane 5 are sandwiched between the first protective film 7B and the second protective film 7C in addition to the same effect as the first filter 9 described above. Therefore, for example, when a normal filtering action is performed, the pressure by the gas or liquid to be filtered can be reliably supported by the first protective film 7B, while, on the other hand, during back pressure cleaning or pulse cleaning Since the pressure can be reliably supported by the second protective film 7C, the life of the filter 29 can be improved.

  Next, the filter 31 and the manufacturing method thereof according to the fourth embodiment will be described. The difference from the filter 21 of the second embodiment and the filter 29 of the third embodiment will be mainly described, and the same members as those in the second and third embodiments are denoted by the same reference numerals. Detailed description will be omitted.

  Referring to FIGS. 7 and 8, the filter 31 has a base cloth-like body 23 made of a material having a large diameter and a coarse mesh, like the filter 21 of the second embodiment described above. It is the cylindrical body comprised by winding at least 1 layer or more. For example, the filter 31 of FIG. 7 is a cylindrical body formed by winding the base cloth-like body 23 into four layers, and the filter 31 of FIG. 8 is a so-called single-layer structure in which only one layer of the base cloth-like body 23 is wound. This is a cylindrical body composed of the base cloth-like body 23.

  In addition, a protective film 27 with a microfiltration membrane is prepared in advance as in the case of the filter 29 of the third embodiment described above. That is, the fine particle material 13 is sprayed on the surface of one side of the first protective film 7B similar to that of the third embodiment with an adhesive as in the case of the third embodiment, or the PTFE film 15 or the microfiber film. The microfiltration membrane 5 is formed by pasting 17 and joining by a joining technique such as adhesion or heat fusion. Next, a second protective film 7C similar to that of the third embodiment is attached to the surface of the microfiltration membrane 5 and bonded by a bonding technique such as adhesion or heat fusion, thereby protecting the microfiltration membrane. A film 27 is created.

  Subsequently, a preliminarily constructed protective membrane 27 with a microfiltration membrane is wound only by one layer so as to contact the first protective membrane 7B on the outside of the filter body 3, and bonding technology such as adhesion or heat fusion is used. The cylindrical filter 31 is completed by joining together. At this time, the adhesion and thermal fusion between the filter main body 3 and the protective film 27 with the microfiltration membrane are the same as those described in the second embodiment, and a detailed description thereof will be omitted.

  Further, as described above, when the protective film 27 with the microfiltration membrane is wound around the outside of the filter body 3, the external pressure filter 31 is formed, but the protective membrane 27 with the microfiltration membrane is wound inside the filter body 3. If it is used, the internal pressure filter 31 is used. The specific manufacturing method is substantially the same as that described in the second embodiment, and the second protective film 7C is wound on the outermost or innermost side.

  Since the operation and effect of the filter 31 of the fourth embodiment manufactured as described above are substantially the same as those described in the filter 29 of the third embodiment described above, detailed description thereof is omitted.

(A), (B) is the schematic explanatory drawing of the manufacturing method of the filter of the 1st Embodiment of this invention, and the partially expanded sectional view of the said filter. (A), (B) is the schematic explanatory drawing of the other manufacturing method of the filter of 1st Embodiment of this invention, and the partially expanded sectional view of the said filter. It is a fragmentary sectional view showing an example of a filter of a 2nd embodiment of this invention. It is a fragmentary sectional view showing other examples of a filter of a 2nd embodiment of this invention. (A) is schematic sectional drawing which shows the whole filter of 2nd Embodiment of this invention, (B) is a perspective view of (A). (A), (B) is the schematic explanatory drawing of the manufacturing method of the filter of the 3rd Embodiment of this invention, and the partially expanded sectional view of the said filter. It is a fragmentary sectional view showing an example of a filter of a 4th embodiment of this invention. It is a fragmentary sectional view showing other examples of a filter of a 4th embodiment of this invention.

Explanation of symbols

1 filter (of the basic configuration of this embodiment)
3 Filter body 5 Microfiltration membrane 7 Protective membrane 7A Non-woven fabric (of protective membrane 7)
7B First protective film (of protective film 7)
7C Second protective film (of protective film 7)
9 Filter (of the first embodiment)
11 Sintered body 13 Fine particle material (microfiltration membrane)
15 PTFE membrane (microfiltration membrane)
17 Microfiber membrane (microfiltration membrane)
19 Protective membrane with microfiltration membrane 21 Filter (of the second embodiment)
23 Base cloth-like body 23A Non-woven fabric (of base cloth-like body 23)
25 filters (basic configuration of other embodiments)
27 Protective membrane with microfiltration membrane (sandwich structure)
29 Filter 31 of the third embodiment Filter of the fourth embodiment

Claims (14)

A filter body having a large diameter material and a large diameter pore;
A microfiltration membrane provided on the outside or the inside of the filter body, a material having a smaller diameter than the filter body, and a microfiltration membrane having finer pores than the filter body,
A protective membrane provided outside or inside the microfiltration membrane, having a larger diameter than the microfiltration membrane and having pores larger in diameter than the microfiltration membrane and having the same or smaller diameter as the filter body It is composed of a material and a protective film having pores smaller than the filter body, and
A filter characterized in that the filter main body, the microfiltration membrane, and the protective film are bonded to each other by a bonding technique such as adhesion or thermal fusion. A filter body having a large diameter material and a large diameter pore;
A first protective film provided outside or inside the filter body, the first protective film having the same or a small diameter as the filter body and having pores smaller than the filter body;
A microfiltration membrane provided outside or inside the first protective membrane, the microfiltration membrane having a smaller diameter than the first protective membrane and having finer pores than the first protective membrane; ,
A second protective membrane provided on the outside or inside of the microfiltration membrane, having a material larger in diameter than the microfiltration membrane and having pores larger in diameter than the microfiltration membrane and being equivalent to the filter body Or a small-diameter material and a second protective film having pores finer than the filter body, and
A filter, wherein the filter main body, the first protective film, the microfiltration film, and the second protective film are bonded to each other by a bonding technique such as adhesion or thermal fusion.   A cylindrical shape in which the filter body is made of a large-diameter resin and a sintered body having large-diameter pores or a large-diameter material and a coarse mesh base cloth-like body wound around at least one layer. The filter according to claim 1, wherein the filter is a body.   4. The filter according to claim 1, wherein the microfiltration membrane is an adhesive layer made of a fine particle material, a porous membrane having micropores, or a microfiber membrane.   5. The filter according to claim 1, wherein the protective film is coated with a resin having dust releasability.   The filter according to claim 1, 2, 3, 4 or 5, wherein the protective film has a thickness of 10 µm to 1000 µm. Form a filter body with large-diameter material and large-diameter pores,
By spraying a fine particle material on the outside or inside of this filter body with an adhesive, a material having a smaller diameter than the filter body and forming a microfiltration membrane having finer pores than the filter body,
On the outside or inside of the microfiltration membrane, a material having a diameter larger than that of the microfiltration membrane, and having a pore having a diameter larger than that of the microfiltration membrane, and a material having the same or a small diameter as the filter body, and the filter body A method for producing a filter, characterized in that a protective film having finer pores is bonded by a bonding technique such as adhesion or heat fusion. Form a filter body with large-diameter material and large-diameter pores,
In advance, a material having a pore diameter smaller than that of the protective film and finer pores than that of the protective film is provided on one side of the protective film having a pore equivalent to or smaller in diameter than the filter body and having pores smaller than that of the filter body. A protective membrane with a microfiltration membrane is constructed by bonding the microfiltration membrane with a bonding technique such as adhesion or thermal fusion.
A method for producing a filter, wherein the protective membrane with a microfiltration membrane is bonded by a bonding technique such as adhesion or heat fusion so that the microfiltration membrane is brought into contact with the outside or the inside of the filter body. Form a filter body with large-diameter material and large-diameter pores,
A first protective film having a pore that is equal to or smaller in diameter than the filter main body and having pores smaller than the filter main body, a material having a smaller diameter than the first protective film, and the first protective film A microfiltration membrane having finer pores and a second protective membrane under the same conditions as the first protective membrane are joined together in order by a bonding technique such as bonding or heat fusion as a sandwich structure. Construct a protective film with
A method for producing a filter, characterized in that the protective membrane with a microfiltration membrane is joined by a joining technique such as adhesion or thermal fusion so that the first protective membrane is in contact with the outside or inside of the filter body.   10. The method for producing a filter according to claim 8 or 9, wherein the microfiltration membrane is formed by spraying a fine particle material with an adhesive, or a porous membrane or a microfiber membrane having micropores. .   The method for manufacturing a filter according to claim 7, 8, 9, or 10, wherein the filter body is formed of a sintered body having a large diameter resin and having large diameter pores.   The filter body is formed in a cylindrical shape by winding a base cloth-like body made of a large diameter material and having a coarse mesh around at least one layer around a rotating shaft. The manufacturing method of the filter of description.   The filter manufacturing method according to claim 7, wherein the protective film is coated with a resin having dust releasability.   The method for manufacturing a filter according to claim 7, wherein the protective film is formed to a thickness of 10 μm to 1000 μm.

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