JP2008221202A - Filter and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cheap filter which has a high strength and air permeability, and which does not require any expensive equipment while enabling a surface collection. <P>SOLUTION: The filter comprises a filter body 5 constituted by rolling a base fabric-type body 3 having a thick diameter raw material and a coarse mesh into a cylinder, and a filter surface body 7 wound around the outside or the inside of the filter body 5. The filter surface body 7 has the constitution that the surface of a surface fabric-type body 9 having a smaller diameter raw material than the base fabric-type body 3, and a finer mesh than the base fabric-type body 3, keeps a surface film having a finer pore than the surface fabric-type body 9 bonded by a bonding technique such as an adhesion or a thermal fusion. <P>COPYRIGHT: (C)2008,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, various types of filters have been used as collection means for separating and filtering fine dust from gaseous or liquid fluids. When classified by filter shape, pleated filters, cylindrical filters, flat plates Filter.

  For example, as shown in Patent Document 1 and Patent Document 2, the pleated filter is obtained by processing a pleated filter material into a cylindrical shape, because of its simple structure and low pressure loss. , The most commonly used.

  The cylindrical filter is a cylindrical filter having a circular or oval cross-sectional shape. In addition, as a form of the cylindrical filter, for example, a form in which a filter medium such as a cloth or a nonwoven fabric is provided inside or outside a support body (retainer) such as a bowl having a circular cross section, or a sintered body is used as the filter medium. There is a form. For example, in Patent Document 3, a heat-fusible conjugate fiber is composed of a fiber assembly layer fused through a heat-fusible component.

  The flat filter is a tubular filter having a corrugated cross section and a rectangular shape as a whole, and has a flat plate shape when viewed from the outside. For example, as shown in Patent Document 4, a corrugated plate is formed in a rectangular cross section, and when viewed from the outside, it is flat as a whole. In Patent Document 4, a sintered body is used as a filter medium. In addition, there is also a form in which a filter medium such as a cloth or a nonwoven fabric is provided on the inside or outside of a support (retainer) such as a bowl having a rectangular cross section.

  Moreover, as a raw material used for the filter medium of the conventional filter mentioned above, there exist cloth-like bodies, such as cloth containing a nonwoven fabric, or a sintered compact.

In addition, as the structure of the filter medium of the conventional filter described above, a form constituted by a substantially uniform mesh, a form constituted by a fine mesh on the surface of the filter medium for the purpose of collecting the surface of dust, and patent literature As shown in FIG. 3, there is a form in which a foreign material is put in the center of the filter medium. For example, when the surface of the filter medium is constituted by a fine mesh, there are a form in which fine particles are adhered to the surface, a form in which microfibers are attached, a form in which a fine film is attached, and the like.
Japanese Patent No. 2507456 Japanese Utility Model Publication No. 8-1510 Japanese Patent No. 3677836 JP 2003-126627 A

  By the way, in the above-mentioned conventional filter, although the apparent surface area of the pleated filter is large, dust is likely to be clogged between the pleats, so that its lifetime is generally about one year. Further, when the filtration pressure is increased, the air pressure or the liquid pressure causes the pleats to closely contact each other, so that there is a problem that the performance such as the air volume or the liquid volume (fluid volume) is likely to deteriorate due to the small effective surface area. . In order to solve this problem, in Patent Document 2, a net-like spacer is provided between the pleats of the filter medium on the downstream (airflow) side of the filter medium.

  The spacer is provided outside the filter medium in the case of an internal pressure type that filters from the central part to the peripheral part of the sealed container, and is provided inside the filter medium in the case of an external pressure type that filters from the peripheral part of the closed container toward the central part. It is done. However, it is difficult to interpose the above-mentioned mesh spacer between the pleats. Further, since the spacer has a pressure loss, the liquid permeability or the air permeability is lowered, and the number of pleats of the filter medium is reduced because the spacer is provided. Therefore, the provision of the spacer for the reason that the filtration area becomes small, on the other hand, has a problem that the whole filter is complicated and the cost is increased, and the capability is lowered in another aspect. Furthermore, it has not been solved that dust is easily clogged between the pleats and the life is short.

  In the conventional cylindrical filter, the shape is simple, but since the surface area is small, it is necessary to increase the number of filters. Further, when a cloth-like body such as cloth or non-woven fabric is used as a filter medium, for example, a support (retainer) such as a saddle-like body is required, and therefore the cloth or non-woven fabric rubs against the support (retainer). There was a problem that it was damaged early. On the other hand, when a strong sintered body is used as a filter medium, there is a problem that an expensive mold and a sintering furnace are required.

  In a conventional flat filter, when a cloth material such as cloth or non-woven fabric is used as a filter medium, it is necessary to receive a fluid pressure on a wide surface and a support (retainer) to maintain strength. In addition, there is a problem that the filter medium is rubbed with the support (retainer) and damaged early. On the other hand, when a sintered body having strength is used as a filter medium, the cross-sectional shape is complicated, so that there is a problem that a more expensive mold and sintering furnace are required than in the case of the above-described cylindrical filter.

  Moreover, in the case of a cloth-like material such as cloth or non-woven fabric, the strength of the material used for the filter medium of the conventional filter is low (insufficient), so pleating is performed or the strength is maintained. Therefore, there is a problem that the cost is high.

  On the other hand, in the case of a sintered body, since uniformity is a premise, there is a problem in that the cost is increased because the entire filter is applied when providing conductivity. Further, in order to increase the strength of the sintered body, it is necessary to increase the thickness. In addition, since it is difficult to balance strength and elasticity, multilayering is difficult.

  In addition, in the structure of the filter medium of the conventional filter, in the form constituted by a substantially uniform mesh, dust is likely to clog because the dust enters the filter component, so there is a problem that the life is short. there were. On the other hand, in the form in which the surface is constituted by a fine mesh, there is a problem in that the cost is high because an advanced technique is required.

In order to achieve the problem to be solved by the above invention, the filter of the present invention is a large-diameter material and a filter main body configured by winding a coarse mesh base cloth-like body into a cylindrical shape,
A filter surface body wound around the outside or the inside of the filter body, the surface of the surface cloth-like body having a smaller diameter than the base cloth-like body and having a mesh finer than the base cloth-like body in advance. And a filter surface body formed by bonding a surface film having finer pores than the surface cloth-like body by a bonding technique such as adhesion or heat fusion.

Further, the filter of the present invention is a filter main body that is a large diameter material and has a coarse mesh thickness of 1.0 mm or more and does not use a support formed by winding a base cloth-like body into a cylindrical shape,
A filter intermediate body wound around the outer side or the inner side of the filter body, wherein the intermediate filter body is made of an intermediate cloth material having a finer diameter than the base cloth body and having a finer mesh than the base cloth body. Body,
The surface of the surface cloth-like body wound around the outside or inside of the filter intermediate body, and having a mesh smaller than the intermediate cloth-like body and having a finer mesh than the intermediate cloth-like body in advance. And a filter surface body formed by bonding a surface film having finer pores than the surface cloth-like body by a bonding technique such as adhesion or heat fusion. .

  In the filter of the present invention, it is preferable that the filter main body, the filter intermediate body, and the filter surface body are bonded to each other by a bonding technique such as adhesion or heat fusion, and no support is used.

  In the filter according to the present invention, in the filter, the surface film constituting the surface cloth-like body is preferably a porous film or microfiber having micropores.

  In the filter of the present invention, the filter surface body is preferably composed of only one layer.

  Moreover, the filter of this invention WHEREIN: It is preferable that the surface cloth-like body of the said filter surface body contains the conductive fiber in the said filter.

  Moreover, the filter of this invention WHEREIN: It is preferable that the said cylindrical cross section is circular shape, star shape, or corrugated plate shape in the said filter.

Further, the filter manufacturing method of the present invention is a thick material, and a base cloth-like body of a coarse mesh is wound around a rotating shaft into a plurality of layers to form a cylindrical filter body,
On the outside of the filter body, fine pores finer than the surface cloth-like body are formed on the surface of the surface cloth-like body that has a smaller diameter than the base cloth-like body and has a finer mesh than the base cloth-like body. Winding the filter surface body constructed by bonding the surface film with bonding technology such as adhesion or heat fusion,
A cylindrical filter is manufactured by bonding the filter body and the filter surface body by a bonding technique such as adhesion or heat fusion.

Further, the filter manufacturing method of the present invention is a thick material, and a base cloth-like body of a coarse mesh is wound around a rotating shaft into a plurality of layers to form a cylindrical filter body,
On the outside of the filter body, a filter intermediate body made of an intermediate cloth body having a finer diameter than the base cloth body and a mesh finer than the base cloth body is wound,
Fine pores finer than the surface cloth-like body are formed on the surface of the surface cloth-like body having a finer diameter than the intermediate cloth-like body and having a finer mesh than the intermediate cloth-like body. A filter surface body constructed by bonding a surface film having a surface with a bonding technique such as adhesion or heat fusion,
A cylindrical filter is manufactured by bonding the filter body, the filter intermediate body, and the filter surface body by a bonding technique such as adhesion or heat fusion.

Further, the filter manufacturing method of the present invention is such that a surface film having fine pores finer than the surface cloth-like body is bonded or heat-melted on the surface of the fine cloth surface cloth-like body in advance. The filter surface body, which is constructed by joining techniques such as wearing, is wound around the rotating shaft,
A cylindrical filter body is formed on the outside of the filter surface body by winding a base cloth body having a larger diameter than the surface cloth body and having a mesh coarser than the surface cloth body into a plurality of layers. ,
A cylindrical filter is manufactured by bonding the filter body and the filter surface body by a bonding technique such as adhesion or heat fusion.

Further, the filter manufacturing method of the present invention is such that a surface film having fine pores finer than the surface cloth-like body is bonded or heat-melted on the surface of the fine cloth surface cloth-like body in advance. The filter surface body, which is constructed by joining techniques such as wearing, is wound around the rotating shaft,
On the outside of the filter surface body, a filter intermediate body composed of an intermediate cloth-like body having a mesh larger than the filter surface body and having a coarser mesh than the filter surface body is wound,
On the outside of this filter intermediate body, a base cloth-like body made of a material larger in diameter than the filter intermediate body and having a mesh coarser than the filter intermediate body is wound into a plurality of layers to form a cylindrical filter body,
A cylindrical filter is manufactured by bonding the filter body, the filter intermediate body, and the filter surface body by a bonding technique such as adhesion or heat fusion.

  In the filter manufacturing method of the present invention, in the filter manufacturing method, the surface film constituting the surface cloth-like body is preferably a porous film or microfiber having micropores.

  In the filter manufacturing method of the present invention, the cylindrical filter is preferably formed into a star-shaped or corrugated cross-sectional shape from the cylindrical filter.

  As will be understood from the means for solving the problems as described above, according to the filter of the present invention, it has high strength and air permeability, and enables surface collection, a sintering furnace, a mold, etc. It is possible to provide an inexpensive filter that does not require such expensive and large-scale equipment.

  In addition, since the surface of the surface cloth having a finer mesh than that of the surface cloth-like body is bonded to the surface of the surface cloth-like body having a finer mesh than the base cloth-like body of the filter body in advance, the surface film By maintaining a stable strength, the quality of the surface film is stabilized, and it is possible to handle a thin surface film that is difficult to handle even without special large-scale equipment, so that the cost can be reduced.

  In addition, the surface film is weak in strength, but since it is supported by the surface cloth at an appropriate interval, there is an action and effect that does not generate excessive stress in the surface film. In addition, since the filter surface body is supported by the filter body having a higher strength, the pressure applied to the surface film is gradually dispersed through the surface cloth so as to reduce the stress concentration and transmitted to the filter body. Long life can be achieved.

  In addition, since the surface film is supported by the coarser cloth cloth and then supported by the filter body having a large gap, the amount of air passing through the filter or the amount of liquid (fluid amount) can be increased.

  In addition, by forming the filter body by winding the base cloth-like body around the rotating shaft in a plurality of layers, the structure in the thickness direction of the filter can be easily changed, so that the strength and rigidity of the filter can be controlled. By the way, the control of the strength and rigidity of the filter greatly influences the performance such as the service life and the removal property. For example, in order to improve the life of the filter, it is necessary to increase the strength by increasing the thickness of the filter. However, if the filter is increased in thickness, the elasticity is lowered and the scraping property is deteriorated. Therefore, since the configuration in the thickness direction of the filter can be easily changed, the characteristics of the filter can be easily controlled according to needs. Further, since the rigidity of the filter body can be increased, it is not necessary to use a support such as a retainer, and a filter having a simple structure and a low cost can be made.

  Further, according to the filter of the present invention, the same effect as the above-described filter can be obtained. However, since the filter intermediate body is interposed between the filter main body and the filter surface body, the pressure applied to the surface film is stressed. Since it is gradually transmitted from the surface cloth to the filter body via the filter intermediate so as to reduce concentration, the strong stress applied to the filter is distributed more easily and efficiently than in the case of the filter described above. Can receive. Others are the same.

  Also, in any case of the filter manufacturing method of the present invention, the surface of the surface cloth-like body in which the filter surface body has a finer mesh than the base cloth-like body of the filter body or the intermediate cloth-like body of the filter intermediate body in advance. In addition, since the surface film with fine pores finer than this surface cloth was joined, the surface film maintained stable strength, the surface film quality was stable, and there was no special large-scale equipment. However, it is possible to handle a thin surface film that is difficult to handle, so that the cost can be reduced.

  Moreover, since the base cloth-like body can be wound around a rotating shaft in a plurality of layers and the configuration in the thickness direction of the filter can be easily changed, the strength and rigidity of the filter can be controlled. In addition, either the internal pressure type or the external pressure type can be selected by simply selecting the necessary constituent members of the base cloth-like body, the intermediate cloth-like body, and the filter surface body and changing the order of winding the constituent members around the rotating shaft. Since the filter can also be manufactured by a simple manufacturing method, a filter having an excellent effect as described above can be manufactured at low cost.

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

  Referring to FIGS. 1A to 1C, the filter 1 according to the first embodiment is basically a large-diameter material having a strong strength for supporting the filter 1 itself, and The filter body 5 is formed by winding a base cloth-like body 3 such as a coarse mesh nonwoven fabric or woven fabric into a cylindrical shape, and the filter surface body 7 is wound around the outside of the filter body 5. In addition, the filter surface body 7 is previously formed on the surface of the surface cloth-like body 9 such as a nonwoven fabric or a woven fabric having a finer diameter than the base cloth-like body 3 and a finer mesh than the base cloth-like body 3. A surface film 11 having finer pores than the surface cloth-like body 9 is bonded by a bonding technique such as adhesion or heat fusion. The filter surface body 7 is wound so that the surface cloth-like body 9 side is in contact with the base cloth-like body 3 of the filter body 5.

  The filter main body 5 and the filter surface body 7 are joined by a joining technique such as adhesion or heat fusion.

More specifically, as the filter body 5, in this embodiment, the base cloth-like 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 (corresponding to the density of the nonwoven fabric of 0.05 to 0.07 g / cm ³ ), this nonwoven fabric 3A is wound into a plurality of layers and formed into a cylindrical shape, and this cylindrical thickness That is, the total thickness of the plurality of layers of the nonwoven fabric 3A is 1.0 to 5.0 mm and / or a conventional support is not used.

  As the nonwoven fabric 3A, materials such as PP (polypropylene), PE (polyethylene) including low density polyethylene and high density polyethylene, or a 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.

  Further, the multiple layers of the nonwoven fabric 3A are bonded 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.

Moreover, as said filter surface body 7, in this embodiment, the surface cloth-like body 9 has a diameter of, for example, 10 to 100 μm and a pore diameter of 5 μm smaller than the nonwoven fabric 3A (the density of the nonwoven fabric is 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 ) and a nonwoven fabric 9A having a pore diameter of 5 to 400 μm. The surface of the nonwoven fabric 9A is finer than 10 μm finer than the nonwoven fabric 9A. For example, the porous film 11A or the microfiber 11B as the surface film 11 having holes is bonded by a bonding technique such as adhesion or heat fusion.

  In addition, since the raw material of resin similar to the nonwoven fabric 3A mentioned above is used as said nonwoven fabric 9A, detailed description is abbreviate | omitted.

  The porous membrane 11A has fine pores with a diameter of 10 μm or less, such as a PTFE membrane. Since this PTFE membrane is a Teflon (registered trademark) material, the adhesion of dust is weak, so the collected dust is likely to fall. The porous film 11A 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 11B has a fiber diameter of 10 μm or less and has a hole with a diameter of 10 μm or less. For example, the microfiber 11B such as Teflon (registered trademark), polyethylene, polypropylene, cellulose, or the like is formed into a sheet shape such as a nonwoven fabric. It is a sheet made of the above-mentioned object, is relatively inexpensive, is easy to add heat resistance and flame retardancy by performing surface treatment, and can improve dust releasability. Specifically, the fiber diameter is 0.01 to 10 μm.

  In addition, for bonding the nonwoven fabric 9A and the surface film 11, the same adhesive as the above-mentioned multiple-layer adhesive of the non-woven fabric 3A is used. Since it is the same as fusion, detailed description is abbreviate | omitted.

  As described above, a preliminarily constructed filter surface body 7 is wound around the outer side of the cylindrical filter main body 5 by one layer and joined by a joining technique such as adhesion or heat fusion, thereby FIG. As shown in FIG. 1, the cylindrical filter 1 according to the first embodiment is completed. Note that the length L of the cylindrical filter 1 is, for example, 10 to 5000 mm.

  At this time, for the adhesion between the filter main body 5 and the filter surface body 7, the same adhesive as the above-mentioned plural layers of the nonwoven fabric 3 </ b> A is used. Since it is the same as the heat fusion of the layers, detailed description is omitted.

  When bonding the above layers by bonding or heat fusion, generally, the layers of the filter body 5 are first bonded, and then the filter surface body 7 is bonded to the filter body 5. However, the layers of the filter main body 5 and the filter surface body 7 can be bonded simultaneously.

  In the first embodiment, the filter surface body 7 is wound around the outside of the filter body 5 as shown in FIG. 1A, but the filter surface body 7 is wound inside the filter body 5. You may be. That is, in the external pressure type in which the filter is filtered from the periphery of the cylindrical filter 1 toward the center, the filter surface body 7 is wound around the outside of the filter body 5, but is filtered from the center of the filter 1 toward the periphery. In the internal pressure type, the filter surface body 7 is wound inside the filter body 5.

  In both the external pressure type and the internal pressure type, the surface cloth-like body 9 constituting the filter surface body 7 is wound so that the filter body 5 is in contact therewith. That is, the surface film 11 constituting the filter surface body 7 is located on the outermost side or the innermost side.

  With the above configuration, the strength and breathability of the filter 1 are ensured by the tubular filter body 5 in which the base cloth-like body 3 having a large material diameter and a coarse mesh is wound in a plurality of layers. In addition to this, the filter surface body 7 provided with the surface film 11 having fine holes is provided on the surface side of the filter 1 (outside or inside of the cylindrical filter body 5), so that a good dust trapping is achieved. Collection performance is secured. That is, it is possible to provide an inexpensive filter 1 that has high strength and air permeability and does not require expensive and large-scale equipment such as a sintering furnace or a mold while enabling good surface collection. it can.

  The filter surface body 7 has a surface film 11 having fine pores finer than the surface cloth-like body 9 on the surface of the surface cloth-like body 9 having a finer mesh than the base cloth-like body 3 of the filter body 5 in advance. Therefore, the surface film 11 can maintain a stable strength. For example, since the surface film 11 having fine pores finer than the surface cloth-like body 9 is weak in strength, if the surface film 11 is directly attached to the cylindrical filter body 5, problems such as tearing or overlapping of the surface film 11 occur. Will occur frequently. However, the thin surface film 11 is difficult to handle due to its low strength. However, since the strength is maintained by previously bonding the surface film 11 to the surface cloth body 9 as described above, the quality of the surface film 11 is improved. Can be stabilized and can be handled easily without any special large-scale equipment, so that the cost can be reduced.

  More specifically, since the particles of, for example, the porous film 11A as the surface film 11 constitute a bridge with the fibers of, for example, the nonwoven fabric 9A as the surface cloth-like body 9, and have many support points, the surface film 11 The tensile force due to the pressure is applied to the fibers of the nonwoven fabric 9A of the surface cloth-like body 9, and the surface film 11 is supported by the surface cloth-like body 9. That is, although the surface film 11 is weak in strength, it is supported by the surface cloth-like body 9 at an appropriate interval, so that the surface cloth-like body 9 has an action and an effect that does not generate excessive stress on the surface film 11.

  Moreover, since the surface cloth-like body 9 is supported by the filter body 5 composed of a plurality of layers of the base cloth-like body 3 having a higher strength, the surface cloth so that the pressure applied to the surface film 11 reduces stress concentration. It is gradually transmitted to the filter body 5 through the body 9. Therefore, since the strong stress applied to the filter 1 is basically dispersed and received by the filter body 5 having a high strength, the long life of the filter 1 can be obtained.

  Therefore, since the porous film 11A of the surface film 11 has fine pores, it can collect fine particle dust, improve the efficiency of surface filtration, and as described above, the porous film 11A of the surface film 11 After the surface cloth-like body 9 is supported by the filter body 5 having a large gap after being supported by the surface cloth-like body 9 at an appropriate interval, it has an appropriate and wide opening as a whole, and the passage of fluid Since the area can be increased, it is possible to provide the long-life filter 1 without reducing the air volume or the liquid volume (fluid volume).

  Further, since the filter main body 5 is formed by winding the base cloth-like body 3 into a plurality of layers in a cylindrical shape, the thickness direction of the filter main body 5, that is, the filter 1 is changed by changing the number of turns of the base cloth-like body 3. Therefore, the strength and rigidity of the filter 1 can be controlled.

  Incidentally, the control of the strength and rigidity of the filter 1 greatly influences the performance such as the lifespan and the removal property. For example, in order to improve the life of the filter 1, it is necessary to increase the strength by increasing the thickness of the filter 1. However, if the filter 1 is increased in thickness, the elasticity is lowered and the scraping property is deteriorated. Therefore, since the configuration in the thickness direction of the filter 1 can be easily changed, the characteristics of the filter 1 can be easily controlled according to needs.

  Next, a filter 13 according to a second embodiment of the present invention will be described with reference to the drawings. The same members as those of the filter 1 of the first embodiment described above are denoted by the same reference numerals, and in particular, differences from the filter 1 of the first embodiment will be described, and detailed description of similar parts will be omitted. .

  2A to 2C, the filter 13 is different from the filter 1 described above in that a filter intermediate 15 is interposed between the filter main body 5 and the filter surface body 7 similar to the filter 1. There is in being. That is, a filter body 5 formed by winding the base cloth-like body 3 into a cylindrical shape, a filter intermediate body 15 wound around the outside of the filter body 5, and a filter surface body wound around the outside of the filter intermediate body 15 7.

  The filter intermediate body 15 is composed of an intermediate cloth body 17 such as a nonwoven fabric or a woven fabric having a smaller diameter than the base cloth body 3 of the filter body 5 and a finer mesh than the base cloth body 3. Has been. The filter surface body 7 is wound so that the surface cloth-like body 9 side is in contact with the intermediate cloth-like body 17 of the filter intermediate body 15.

  Further, the filter main body 5, the filter intermediate body 15, and the filter surface body 7 are joined by a joining technique such as adhesion or heat fusion.

More specifically, as the filter main body 5, the base cloth-like body 3 has a diameter of, for example, 5 to 300 μm and a pore diameter of 10 μm (the density of the nonwoven fabric is 0.4 to 4), as in the first embodiment. 0.6 g / cm ³ equivalent) ～1000Myuemu (density 0.05~0.07g / cm ³ equivalent to a nonwoven fabric) and nonwoven 3A having this non-woven fabric 3A is wound in a plurality of layers is formed into a cylindrical shape The cylindrical thickness, that is, the total thickness of the plurality of layers of the nonwoven fabric 3A is 1.0 to 5.0 mm. In addition, the multiple layers of the nonwoven fabric 3A are joined by a joining technique such as adhesion or heat fusion.

Moreover, as said filter intermediate body 15, in 2nd Embodiment, the intermediate | middle cloth-like body 17 is a diameter of 10-100 micrometers, for example, and the hole diameter is 10 micrometers from the nonwoven fabric 3A (the density of a nonwoven fabric is 0.4-0.6 g / cm ³ ) to 500 μm (the density of the nonwoven fabric is equivalent to 0.05 to 0.1 g / cm ³ ) Non-woven fabric 17A having a pore diameter of 10 to 500 μm, and this non-woven fabric 17A is one layer on the outside of the cylindrical filter body 5 Or it is wound around multiple layers. For example, the thickness of the filter intermediate 15, that is, the total thickness of one layer or a plurality of layers of the nonwoven fabric 17 </ b> A is 1 to 5 mm.

  In addition, since the raw material of resin similar to the nonwoven fabric 3A of the filter main body 5 mentioned above is used as the nonwoven fabric 17A as the intermediate | middle cloth-like body 17 of the filter intermediate body 15, detailed description is abbreviate | omitted.

Moreover, as said filter surface body 7, similarly to 1st Embodiment mentioned above, the surface cloth-like body 9 is a diameter of 10-100 micrometers, for example, and the hole diameter 5 micrometers finer than the nonwoven fabric 17A (the density of a nonwoven fabric is 0.00. It is a nonwoven fabric 9A having a thickness of 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 ), and the surface of the nonwoven fabric 9A is 10 μm or less finer than the nonwoven fabric 9A. For example, the porous film 11A or the microfiber 11B as the surface film 11 having the fine holes is bonded by a bonding technique such as adhesion or heat fusion.

  Since the porous film 11A or the microfiber 11B is the same as that of the first embodiment described above, detailed description thereof is omitted.

  The filter surface body 7 is wound by one layer around the outer side of the cylindrical filter intermediate body 15 and joined by a joining technique such as adhesion or heat fusion, whereby the filter 13 of the second embodiment is completed. To do. Note that the length L of the cylindrical filter 13 is, for example, 10 to 5000 mm.

  At this time, the same adhesive as that in the first embodiment is used for bonding the filter body 5, the filter intermediate body 15 and the filter surface body 7. On the other hand, in the case of thermal fusion, Since this is the same as that of the first embodiment, detailed description thereof is omitted.

  When joining the above layers by adhesion or heat fusion, generally, the layers of the filter body 5 are first joined, and then the filter intermediate body 15 is joined to the filter body 5 and then the filter body 5 is joined. The filter surface body 7 is joined to the filter intermediate body 15. However, the layers of the filter main body 5, the filter intermediate body 15, and the filter surface body 7 can be bonded simultaneously.

  In the second embodiment, as shown in FIG. 2A, a filter intermediate body 15 is wound around the filter body 5 and a filter surface body 7 is wound around the filter intermediate body 15. However, the filter intermediate body 15 may be wound inside the filter body 5, and the filter surface body 7 may be wound inside the filter intermediate body 15. That is, in the external pressure type in which the filter is filtered from the periphery of the cylindrical filter 13 toward the center, the filter surface body 7 is wound on the outermost side of the filter 13, but is filtered from the center of the filter 1 toward the periphery. In the internal pressure type, the filter surface body 7 is wound on the innermost side of the filter 13.

  Note that, in both the external pressure type and the internal pressure type, the surface cloth-like body 9 constituting the filter surface body 7 is wound so that the filter intermediate body 15 is in contact therewith. That is, the surface film 11 constituting the filter surface body 7 is located on the outermost side or the innermost side.

  Further, the action and effect of the filter 13 according to the second embodiment of the present invention is different from the filter 1 of the first embodiment in that the filter intermediate body 15 is composed of the filter body 5 and the filter surface body 7. By being interposed, the pressure applied to the surface film 11 is gradually transmitted from the surface cloth-like body 9 to the filter main body 5 via the filter intermediate body 15 so as to reduce the stress concentration. The strong stress applied to the filter body 5 is distributed more comfortably and efficiently than in the case of the filter 1 of the first embodiment, and is received by the filter body 5. The rest is almost the same as in the first embodiment, and a detailed description thereof will be omitted.

  Next, another embodiment according to the filters 1 and 13 of the first and second embodiments described above will be described.

  By containing conductive fibers in, for example, the non-woven fabric 9A as the surface cloth-like body 9 of the filter surface body 7 constituting the filters 1 and 13, the generation of static electricity can be prevented, and an electrostatic countermeasure can be easily taken. Become.

  In the first and second embodiments described above, the filter surface body 7 is wound only on one layer around the outer side of the cylindrical filter body 5, but is not necessarily limited to one layer. However, if the filter surface body 7 is wound around two or more layers, the surface film 11 of the filter surface body 7 becomes a plurality of layers, and air permeability is reduced. It is desirable to have only one layer.

  Further, even when conductive fibers are contained in, for example, the nonwoven fabric 9A as the surface cloth-like body 9, it is desirable that the filter surface body 7 has only one layer for the reason that expensive conductive treatment is made inexpensive.

  Next, a filter 19 according to a third embodiment of the present invention will be described with reference to the drawings. Note that members similar to those of the filters 1 and 13 of the first and second embodiments described above are described with the same reference numerals.

  Referring to FIG. 3, the filters 1 and 13 of the first and second embodiments are hollow cylindrical filters, but a star-shaped cross section as shown in FIG. 3 from the hollow cylindrical shape. Can be transformed into a hollow star-shaped cylindrical star filter. In the cross section of the filter 19 in FIG. 3, the thick portion has the same configuration as the filters 1 and 13 shown in FIGS. 1 and 2, but the details are omitted.

  As a method for forming the filter 19, for example, a star column mold having a star-shaped cross section is inserted into the hollow cylinder of the filters 1 and 13. Next, by applying heat and applying pressure from the periphery of the filters 1 and 13 using a sheet metal processing machine such as a press machine, the filters 1 and 13 are pressed against the outer periphery of the mold of the star column. Can be bent.

  The operation and effect of the filter 19 according to the third embodiment of the present invention are substantially the same as those of the filters 1 and 13 of the first and second embodiments described above, and detailed description thereof is omitted.

  Next, a filter 21 according to a fourth embodiment of the invention will be described with reference to the drawings. Note that members similar to those of the filters 1 and 13 of the first and second embodiments described above are described with the same reference numerals.

  Referring to FIG. 4, the filters 1 and 13 of the first and second embodiments are hollow cylindrical filters, but corrugated plates as shown in FIG. 4 from the hollow cylindrical shape. The cylindrical filter formed in a rectangular cross section can be transformed into a flat plate-like filter as a whole when viewed from the outside. In the cross section of the filter 21 in FIG. 4, the thick portion has the same configuration as the filters 1 and 13 shown in FIGS. 1 and 2, but the details are omitted.

  The method of forming the filter 21 is the same as that of the filter 19 of the third embodiment described above. For example, a columnar mold having a cross section similar to the cross section of the filter 21 shown in FIG. The filter 1 or 13 is inserted into the hollow cylinder. Next, by applying heat and applying pressure from the periphery of the filters 1 and 13 using a sheet metal working machine such as a press working machine, the filters 1 and 13 are pressed against the outer periphery of the mold to be bent. It can be carried out.

  The operation and effect of the filter 21 according to the fourth embodiment of the present invention are the same as those of the filters 1 and 13 of the first and second embodiments described above, and detailed description thereof is omitted.

  Next, a filter manufacturing method according to an embodiment of the present invention will be described with reference to the drawings. That is, since it is a method of manufacturing the filters 1 and 13 of the first and second embodiments described above, the same members as those of the first and second embodiments are denoted by the same reference numerals, Detailed description is omitted.

Referring to FIG. 5, as the filter manufacturing apparatus 23 used in this embodiment, there is a first raw fabric 25 made of a large-diameter material and a coarse mesh base cloth-like body 3 formed in a roll shape. It is wound around the first driven roll 27. In this embodiment, the base cloth-like body 3 has a diameter of, for example, 5 to 300 μm and a coarse pore diameter of 10 μm (corresponding to 0.4 to 0.6 g / cm ³ in density of the nonwoven fabric) to 1000 μm (in terms of the density of the nonwoven fabric). Non-woven fabric 3A having 0.05 to 0.07 g / cm ³ equivalent).

Further, the second original fabric 29 formed by rolling the intermediate cloth-like body 17 having a smaller diameter than the base cloth-like body 3 and having a mesh smaller than that of the base cloth-like body 3 becomes the second driven roll 31. It is wound. In this embodiment, the intermediate cloth 17 has a diameter of 10 to 100 μm, for example, and a pore diameter of 10 μm (corresponding to a density of the nonwoven fabric of 0.4 to 0.6 g / cm ³ ) to 500 μm (of the nonwoven fabric). This is a nonwoven fabric 17A having a density of 0.08 to 0.1 g / cm ³ .

  Further, a third original fabric 33 in which the filter surface body 7 is formed in a roll shape is wound around the third driven roll 35. The filter surface body 7 is preliminarily formed on the surface of the surface cloth body 9 having a smaller diameter than the intermediate cloth body 17 and a finer mesh than the intermediate cloth body 17. The surface film 11 having finer fine holes is joined by a joining technique such as adhesion or heat fusion.

In this embodiment, the filter surface body 7 has a surface cloth-like body 9 having a diameter of 10 to 100 μm, for example, and a pore size of 5 μm smaller than the nonwoven fabric 17A (corresponding to a density of the nonwoven fabric of 0.5 to 0.7 g / cm ^3). ) ～400Myuemu (a nonwoven 9A having 0.1~0.12g / cm ³ equivalent) at a density of the nonwoven fabric, the surface film 11 having the nonwoven 9A finer 10μm following micropores on the surface of the nonwoven 9A For example, the porous film 11A or the microfiber 11B is bonded by a bonding technique such as adhesion or heat fusion.

  Since the porous film 11A or the microfiber 11B is the same as that of the first embodiment described above, detailed description thereof is omitted.

  Further, on the front side (right side in FIG. 5) of the first original fabric 25, the second original fabric 29, and the third original fabric 33, the base cloth-like body 3 of the first original fabric 25, and the second original fabric For example, a driving roll 37 serving as a rotating shaft for winding the intermediate cloth body 17 of 29 and the filter surface body 7 of the third original fabric 33 is provided so as to be rotated by a driving motor (not shown). Furthermore, a pressure-bonding roll 39 that presses against the base cloth-like body 3, the intermediate cloth-like body 17 and the filter surface body 7 wound around the drive roll 37 is provided.

  The crimping roll 39 may be a heating roll or a crimping roll for thermocompression bonding the base cloth-like body 3, the intermediate cloth-like body 17, or the filter surface body 7. When the cloth-like body 17 and the filter surface body 7 are bonded with an adhesive, a simple pressure roll may be used.

  Further, when the base cloth-like body 3 of the first original fabric 25 is wound around the drive roll 37, a first cutter 41 for cutting the wound base cloth-like body 3 with a predetermined length, and the base cloth-like body In order to heat-melt the first adhesive spray 45 for applying the adhesive 43 or the base cloth-like body 3 on the inner surface side of the first heater 54, a first heater 54 is provided.

  When the intermediate cloth-like body 17 of the second original fabric 29 is wound around the drive roll 37, a second cutter 47 for cutting the wound intermediate cloth-like body 17 with a predetermined length, and the intermediate cloth-like body A second heater 55 is provided to thermally melt the second adhesive spray 49 for applying the adhesive 43 on the inner surface side of the 17 or the intermediate cloth-like body 17.

  Further, when the filter surface body 7 of the third original fabric 33 is wound around the drive roll 37, the third cutter 51 for cutting the wound filter surface body 7 by a predetermined length, and the inner surface of the filter surface body 7 A third heater 56 is provided to thermally melt the third adhesive spray 53 for applying the adhesive 43 on the side or the filter surface body 7.

  In addition, although not shown in figure between the 1st original fabric 25, the 2nd original fabric 29, the 3rd original fabric 33, and the drive roll 37, the base cloth-like body 3, the intermediate cloth-like body 17, and the filter surface body 7 are not shown. After being cut by the first, second, and third cutters 41, 47, and 51, respectively, they are guided so as not to loosen, and are again sent to the drive roll 37 without any trouble.

  The first, second, and third adhesive sprays 45, 49, and 53 are not used when the base cloth-like body 3, the intermediate cloth-like body 17, and the filter surface body 7 are joined by heat fusion. Or not provided.

  A method of manufacturing the filter 1 according to the first embodiment using the filter manufacturing apparatus 23 will be described particularly in the case of joining by thermal fusion. At this time, the second original fabric 29 does not operate.

  First, the base cloth-like body 3 of the first original fabric 25 is wound around the drive roll 37 in a plurality of layers while being melted by the first heater 54. That is, the base cloth-like body 3 is cut to a predetermined length by the first cutter 41, and the entire base cloth-like body 3 after being cut is wound around the drive roll 37. At this time, the base cloth-like body 3 is pressed by the side of the driving roll 37 while being heated by the pressure roll 39 of the heating roll, so that the base cloth-like bodies 3 of a plurality of layers are joined to each other by heat-sealing. A filter body 5 is formed.

  Next, the filter surface body 7 of the third raw fabric 33 is outside the cylindrical filter body 5 wound around the drive roll 37, and the surface cloth-like body 9 constituting the filter surface body 7 is the filter body 5. One layer is wound so as to be in contact with the base cloth-like body 3. That is, the filter surface body 7 is cut to a predetermined length by the third cutter 51, and all of the cut filter surface body 7 is wound around the outer side of the filter body 5 by one layer. At this time, the filter surface body 7 is melted by the third heater 56 and pressed against the drive roll 37 while being heated by the pressure roll 39, so that the filter surface body 7 is thermally bonded to the filter body 5. As shown in FIG. 1C, the cylindrical filter 1 having a length L of, for example, 10 to 5000 mm is formed. Subsequently, the filter 1 is completed by being extracted from the drive roll 37.

  In addition, since the effect | action and effect of the filter 1 manufactured as mentioned above are the same as that of the filter 1 of 1st Embodiment mentioned above, detailed description is abbreviate | omitted.

  Next, a method for manufacturing the filter 13 according to the second embodiment using the above-described filter manufacturing apparatus 23 will be described, particularly in the case of joining by thermal fusion.

  First, the base cloth-like body 3 of the first original fabric 25 is wound around the drive roll 37 in a plurality of layers while being melted by the first heater 54. That is, the base cloth-like body 3 is cut to a predetermined length by the first cutter 41, and the entire base cloth-like body 3 after being cut is wound around the drive roll 37. At this time, the base cloth-like body 3 is pressed by the side of the driving roll 37 while being heated by the pressure roll 39 of the heating roll, so that the base cloth-like bodies 3 of a plurality of layers are joined to each other by heat-sealing. A filter body 5 is formed.

  Next, the intermediate cloth-like body 17 of the second raw fabric 29 is melted by the second heater 55 on the outside of the base cloth-like body 3 of the cylindrical filter body 5 wound around the drive roll 37, and one layer is formed. Or it is wound around multiple layers. That is, the intermediate cloth-like body 17 is cut to a predetermined length by the second cutter 47, and the entire cut intermediate cloth-like body 17 is wound around the outside of the filter body 5. At this time, the intermediate cloth-like body 17 is pressed to the driving roll 37 side while being heated by the pressure-bonding roll 39, so that the intermediate cloth-like body 17 is joined to the filter body 5 by heat fusion. 15 is formed.

  Next, the filter surface body 7 of the third raw fabric 33 is disposed outside the cylindrical filter intermediate body 15 wound around the filter body 5, and the surface cloth-like body 9 constituting the filter surface body 7 is disposed in the middle of the filter. One layer is wound while the intermediate cloth 17 is melted by the third heater 56 so as to come into contact with the intermediate cloth 17 of the body 15. That is, the filter surface body 7 is cut to a predetermined length by the third cutter 51, and the entire cut filter surface body 7 is wound around the outer side of the filter intermediate body 15 by one layer. At this time, the filter surface body 7 is pressed to the drive roll 37 side while being heated by the pressure-bonding roll 39, so that the filter surface body 7 is bonded to the filter intermediate body 15 by heat fusion, and FIG. The cylindrical filter 13 having a length L of, for example, 10 to 5000 mm is formed as shown in FIG. Next, the filter 13 is completed by being extracted from the drive roll 37.

  In addition, since the effect | action and effect of the filter 13 manufactured as mentioned above are the same as that of the filter 13 of 2nd Embodiment mentioned above, detailed description is abbreviate | omitted.

  Next, a method for manufacturing a filter that is a modification of the filter 1 of the first embodiment, that is, an internal pressure type filter having the filter surface body 7 provided on the innermost side, using the filter manufacturing apparatus 23 described above, In particular, the case of joining by thermal fusion will be described. In this case, the internal pressure type filter can be manufactured by exchanging the positions of the first original fabric 25 and the third original fabric 33 in FIG. At this time, the second original fabric 29 does not operate.

  First, the filter surface body 7 of the third original fabric 33 is wound only by one layer so that the surface film 11 side constituting the filter surface body 7 is in contact with the drive roll 37. At this time, the filter surface body 7 was cut by the third cutter 51 at a predetermined length where the ends overlap each other, and the entire cut filter surface body 7 was wound around the outer side of the drive roll 37 by one layer and overlapped. Stabilize the ends by thermocompression bonding or gluing.

  Next, a plurality of base cloth-like bodies 3 of the first original fabric 25 are melted by the first heater 54 outside the surface cloth-like body 9 constituting the cylindrical filter surface body 7 wound around the drive roll 37. Wrapped around the layer. That is, the base cloth-like body 3 is cut at a predetermined length by the first cutter 41, and the entire base cloth-like body 3 after being cut is wound around the filter surface body 7. At this time, the base cloth-like body 3 is pressed by the side of the driving roll 37 while being heated by the pressure roll 39 of the heating roll, so that the base cloth-like bodies 3 of a plurality of layers are joined to each other by heat fusion. The filter main body 5 is formed, and the filter main body 5 is joined to the filter surface body 7 by heat fusion to form a cylindrical filter. Next, this filter is completed by being extracted from the drive roll 37.

  The operation and effect of the internal pressure type filter manufactured as described above are the same as those of the filter 1 of the first embodiment described above, and detailed description thereof is omitted.

  Next, a method for manufacturing a filter that is a modification of the filter 13 of the second embodiment, that is, an internal pressure type filter having the filter surface body 7 on the innermost side, using the filter manufacturing apparatus 23 described above, In particular, the case of joining by thermal fusion will be described. In this case, the internal pressure type filter can be manufactured by exchanging the positions of the first original fabric 25 and the third original fabric 33 in FIG.

  First, the filter surface body 7 of the third original fabric 33 is wound only by one layer so that the surface film 11 side constituting the filter surface body 7 is in contact with the drive roll 37. At this time, the filter surface body 7 is cut to a predetermined length by the third cutter 51, and all of the cut filter surface body 7 is wound around the outer side of the drive roll 37 by one layer.

  Next, the intermediate cloth 17 of the second raw fabric 29 is melted by the second heater 55 outside the surface cloth 9 constituting the cylindrical filter surface 7 wound around the drive roll 37. One layer or a plurality of layers are wound. That is, the intermediate cloth-like body 17 is cut to a predetermined length by the second cutter 47, and the entire cut intermediate cloth-like body 17 is wound around the outer surface of the filter surface body 7. At this time, the intermediate cloth-like body 17 is pressed to the drive roll 37 side while being heated by the pressure-bonding roll 39, so that the intermediate cloth-like body 17 is joined to the filter surface body 7 by heat fusion, so that the filter intermediate A body 15 is formed.

  Next, the base cloth-like body 3 of the first raw fabric 25 is wound around a plurality of layers while being melted by the first heater 54 on the outside of the cylindrical filter intermediate body 15 wound around the surface cloth-like body 9. . That is, the base cloth-like body 3 is cut to a predetermined length by the first cutter 41, and the entire base cloth-like body 3 after being cut is wound around the filter intermediate body 15. At this time, the base cloth-like body 3 is pressed by the side of the driving roll 37 while being heated by the pressure roll 39 of the heating roll, so that the base cloth-like bodies 3 of a plurality of layers are joined to each other by heat fusion. The filter main body 5 is formed, and the filter main body 5 is joined to the filter intermediate body 15 by heat fusion to form a cylindrical filter. Next, this filter is completed by being extracted from the drive roll 37.

  The operation and effect of the internal pressure filter manufactured as described above is the same as that of the filter 13 of the second embodiment described above, and detailed description thereof is omitted.

  In the above-described various filter manufacturing methods, the base cloth-like body 3, the intermediate cloth-like body 17, and the filter surface body 7 have been described as being joined by thermal fusion, but instead of the thermal fusion joining method. In the case of bonding with the adhesive 43, the adhesive 43 is sprayed from the first, second, and third adhesive sprays 45, 49, and 53 shown in FIG. 17 or the inner surface of the filter surface body 7 is coated with an adhesive 43 and is crimped by a simple crimping roll 39 instead of a heating roll. Alternatively, after applying an adhesive with the first, second, and third adhesive sprays 45, 49, and 53, heating with the first, second, and third heaters 54, 55, and 56, Even if it is crimped by the crimping roll 39, it can be handled.

  In addition, since the effect | action and effect of the various filters manufactured in this way are the same as that of the filters 1 and 13 of the 1st and 2nd embodiment mentioned above correspondingly, detailed description is abbreviate | omitted.

(A) is sectional drawing of the filter of 1st Embodiment of this invention, (B) is sectional drawing which shows the partial detail of (A), (C) is 1st Embodiment. It is a perspective view which shows the schematic whole. (A) is sectional drawing of the filter of 2nd Embodiment of this invention, (B) is sectional drawing which shows the partial detail of (A), (C) is 2nd Embodiment. It is a perspective view which shows the schematic whole. It is sectional drawing of the star-shaped filter which post-processed the filter of FIG. 1 or FIG. It is sectional drawing of the flat filter which carried out the post-processing of the filter of FIG. 1 or FIG. It is a schematic explanatory drawing of the manufacturing apparatus of the filter used by embodiment of this invention.

Explanation of symbols

1 filter (of the first embodiment)
3 Base cloth-like body 3A Non-woven fabric 5 Filter body 7 Filter surface body 9 Surface cloth-like body 9A Non-woven fabric 11 Surface membrane 11A Porous membrane 11B Microfiber 13 Filter (of the second embodiment)
DESCRIPTION OF SYMBOLS 15 Filter intermediate body 17 Intermediate cloth-like body 17A Nonwoven fabric 23 Filter manufacturing apparatus 25 1st original fabric 27 1st driven roll 29 2nd original fabric 31 2nd driven roll 33 3rd original fabric 35 3rd driven roll 37 Drive roll 39 Pressure roll 41 First cutter 45 First adhesive spray 47 Second cutter 49 Second adhesive spray 51 Third cutter 53 Third adhesive spray 54 First heater 55 Second heater 56 Third heater

Claims (13)

A filter main body formed by winding a base cloth-like body having a large diameter and a coarse mesh into a cylindrical shape,
A filter surface body wound around the outside or the inside of the filter body, the surface of the surface cloth-like body having a smaller diameter than the base cloth-like body and having a mesh finer than the base cloth-like body in advance. And a filter surface body formed by bonding a surface film having finer pores than the surface cloth-like body by a bonding technique such as adhesion or heat fusion. A filter body composed of a thick material and a coarse mesh having a thickness of 1.0 mm or more and a base cloth-like body wound in a cylindrical shape;
A filter intermediate body wound around the outer side or the inner side of the filter body, wherein the intermediate filter body is made of an intermediate cloth material having a finer diameter than the base cloth body and having a finer mesh than the base cloth body. Body,
The surface of the surface cloth-like body wound around the outside or inside of the filter intermediate body, and having a mesh smaller than the intermediate cloth-like body and having a finer mesh than the intermediate cloth-like body in advance. And a filter surface body formed by bonding a surface film having finer pores than the surface cloth-like body by a bonding technique such as adhesion or heat fusion.   3. The filter according to claim 1, wherein the filter main body, the filter intermediate body, and the filter surface body are bonded to each other by a bonding technique such as adhesion or heat fusion, and no support is used.   The filter according to claim 1, 2, or 3, wherein the surface film constituting the surface cloth-like body is a porous film or microfiber having micropores.   The filter according to claim 1, wherein the filter surface body is composed of only one layer.   The filter according to claim 1, 2, 3, 4 or 5, wherein the surface cloth-like body of the filter surface body contains conductive fibers.   The filter according to claim 1, 2, 3, 4, 5 or 6, wherein the cylindrical cross section has a circular shape, a star shape or a corrugated plate shape. A cylindrical filter body is formed by winding a base cloth-like body with a large diameter and a coarse mesh into a plurality of layers around a rotation axis.
On the outside of the filter body, fine pores finer than the surface cloth-like body are formed on the surface of the surface cloth-like body that has a smaller diameter than the base cloth-like body and has a finer mesh than the base cloth-like body. Winding the filter surface body constructed by bonding the surface film with bonding technology such as adhesion or heat fusion,
A filter manufacturing method comprising manufacturing a cylindrical filter by bonding the filter body and the filter surface body by a bonding technique such as adhesion or heat fusion. A cylindrical filter body is formed by winding a base cloth-like body with a large diameter and a coarse mesh into a plurality of layers around a rotation axis.
On the outside of the filter body, a filter intermediate body made of an intermediate cloth body having a finer diameter than the base cloth body and a mesh finer than the base cloth body is wound,
Fine pores finer than the surface cloth-like body are formed on the surface of the surface cloth-like body having a finer diameter than the intermediate cloth-like body and having a finer mesh than the intermediate cloth-like body. A filter surface body constructed by bonding a surface film having a surface with a bonding technique such as adhesion or heat fusion,
A filter manufacturing method comprising manufacturing a cylindrical filter by bonding the filter main body, the filter intermediate body, and the filter surface body by a bonding technique such as adhesion or heat fusion. A surface film having fine pores finer than the surface cloth-like body is bonded to the surface of the fine cloth surface cloth-like body in advance using a bonding technique such as adhesion or heat fusion. Wind the filter body around the rotation axis,
A cylindrical filter body is formed on the outside of the filter surface body by winding a base cloth body having a larger diameter than the surface cloth body and having a mesh coarser than the surface cloth body into a plurality of layers. ,
A filter manufacturing method comprising manufacturing a cylindrical filter by bonding the filter body and the filter surface body by a bonding technique such as adhesion or heat fusion. A surface film having fine pores finer than the surface cloth-like body is bonded to the surface of the fine cloth surface cloth-like body in advance using a bonding technique such as adhesion or heat fusion. Wind the filter body around the rotation axis,
On the outside of the filter surface body, a filter intermediate body composed of an intermediate cloth-like body having a mesh larger than the filter surface body and having a coarser mesh than the filter surface body is wound,
On the outside of this filter intermediate body, a base cloth-like body made of a material larger in diameter than the filter intermediate body and having a mesh coarser than the filter intermediate body is wound into a plurality of layers to form a cylindrical filter body,
A filter manufacturing method comprising manufacturing a cylindrical filter by bonding the filter main body, the filter intermediate body, and the filter surface body by a bonding technique such as adhesion or heat fusion.   12. The method for producing a filter according to claim 8, 9, 10 or 11, wherein the surface film constituting the surface cloth-like body is a porous film or microfiber having micropores.   The method for producing a filter according to any one of claims 8 to 12, wherein the cylindrical filter is formed into a star-shaped or corrugated cross-sectional shape.

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