JP2008126138A - Gas removing filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas removing filter with high gas permeability and adsorption capacity of gaseous impurity components, and a long service life. <P>SOLUTION: This gas removing filter is composed by stacking two-dimensional mesh-like structures 1 having adsorbability, and has structure of through-holes 3 keeping the size of the mesh formed by continuously disposing the two-dimensional mesh-like structures 1 aligning meshes in relation to the air advancing direction 2 when taking in air. Continuous disposing of the structures 1 with aligned meshes allows the presence of the through-holes 3 near to the size of the mesh in the filter. Air flows selectively through air passages 26 provided by the through-holes 3, providing the gas removing filter having a long service life and high gas permeability. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air cleaning gas removal filter that removes gaseous impurity components.

  In recent years, in the field of air purification, in addition to the general living environment, a very small amount of gas is used, as represented by chemical filters used in semiconductor manufacturing processes in clean rooms of semiconductor manufacturing plants and precision electronics manufacturing plants. There is a need for a long-life filter that removes impurities and maintains high cleanliness air. As this type of gas removal filter, a gas removal filter having a form as described in Patent Document 1 and Patent Document 2 has been proposed.

  The gas removal filter described in Patent Document 1 is a storage case filled with a particulate adsorbent having pores and an increased surface area. Porous plates are provided at an air inlet and an outlet. Yes. The perforated plate has an opening for allowing air to pass therethrough, and the size of the opening is smaller than the particle size of the adsorbent so that the adsorbent does not fall out of the storage case.

Moreover, the gas removal filter described in Patent Document 2 is one in which an adsorbent is supported on a three-dimensional network structure using an adhesive. As this three-dimensional network structure, one having large-diameter continuous pores such as a network polyurethane foam is used.
JP 09-220425 A JP 11-226338 A

  The lifetime of the gas removal filter depends on the amount of gaseous impurity components that can be adsorbed. Therefore, in order to extend the service life, it is necessary to increase the filling amount of the adsorbent. However, if the filling amount of the adsorbent is increased, the volume of the breathable portion is reduced and the air permeability is reduced, so that the pressure loss is reduced. It gets bigger. When the pressure loss increases, the power cost for blowing air increases in order to produce the specified air volume, so a gas removal filter with low pressure loss is required. Therefore, in extending the life of the gas removal filter, an important issue is how much adsorbent is supported on the filter while extending the life while maintaining air permeability so as not to increase pressure loss.

  The gas removal filter of Patent Document 1 has a problem that the passage through which the air passes is small and the air permeability is low because the storage case is filled with the adsorbent without gaps. Moreover, since the gas removal filter of patent document 2 uses the three-dimensional network structure in which the ventilation path is formed at random as a base material, it is easy to produce nonuniformity in air permeability even in the same filter, and the place where air easily passes. Since it breaks through relatively quickly, there is a problem that the life of the entire filter is shortened.

  The present invention solves such conventional problems, and an object of the present invention is to provide a gas removal filter having high air permeability and a long life.

  In order to achieve the above object, the gas removal filter of the present invention is a gas removal filter formed by laminating two-dimensional network structures having adsorbing ability, and has a mesh pattern with respect to the direction of air travel when air is taken in. By arranging the two-dimensional network structure continuously in a uniform manner, a through-hole that maintains the size of the mesh is formed.

  Further, in the gas removal filter according to claim 1, when a plurality of two-dimensional network structures having different aperture ratios are stacked, the aperture ratio of the two-dimensional network structure having the smallest aperture ratio is equal to the aperture ratio of the filter itself. It is characterized by being laminated so as to be the same.

  The gas removal filter according to claim 1 or 2, wherein when the two-dimensional network structure is stacked, the mesh of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure is air. By arranging continuously so as to be parallel to the traveling direction of the air when taking in the air, the direction of the air passage provided by the through-hole formed by the lamination of the mesh is the same as that of the air when taking in the air. It is characterized by being parallel to the traveling direction.

  The gas removal filter according to any one of claims 1 to 3, wherein when the two-dimensional network structure is stacked, the mesh of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure is formed. When the air is taken in, the direction of the air passage provided by the through holes formed by the mesh openings is continuously arranged by shifting by a distance smaller than the thickness of the net when viewed from the air traveling direction when taking in the air. It is inclined with respect to the air traveling direction.

  The gas removal filter according to any one of claims 1 to 4, wherein when the two-dimensional network structure is stacked, the number of meshes per unit area is the same, and the upstream two-dimensional network structure has a thick mesh. By using a thing smaller than the thickness of the mesh of the two-dimensional network structure on the downstream side adjacent to each other, the through-hole formed by the mesh lamination is gradually reduced as it goes downstream. Is.

  6. The gas removal filter according to claim 1, wherein the two-dimensional network structure on the most downstream side is alternately closed and the two-dimensional network structure on the most downstream side is closed. In this network, adjacent meshes are alternately closed so as to be opposite to the upstream two-dimensional network structure.

  The gas removal filter according to any one of claims 1 to 6, wherein when the two-dimensional network structure is stacked, a plurality of rod-shaped members are inserted to automatically align the mesh. .

  Further, in the gas removal filter according to claim 7, when the rod-like member is bent, the air passage provided by the through hole is automatically bent.

  The gas removal filter according to any one of claims 1 to 8, wherein a fine sheet having air permeability is provided on an upstream surface, a downstream surface, or both surfaces of the gas removal filter. It is.

  The gas removal filter according to any one of claims 1 to 9, wherein a sheet provided on the upstream surface, the downstream surface, or both surfaces of the gas removal filter has an adsorbing ability.

  The gas removal filter according to any one of claims 1 to 10, wherein a sheet provided on the upstream surface or the downstream surface of the filter, or both surfaces has a function of collecting dust in the air. To do.

  The gas removal filter according to any one of claims 1 to 11, wherein an adsorption functional group is present in the two-dimensional network structure.

  The gas removal filter according to any one of claims 1 to 12, wherein an adsorbent is supported on the two-dimensional network structure.

  The gas removal filter according to any one of claims 1 to 13, wherein the gas removal filter is formed in a pleated shape.

  The gas removal filter of the present invention is a gas removal filter formed by laminating two-dimensional network structures having adsorbability, and the two-dimensional network structures are aligned with the traveling direction of air when air is taken in. By continuously disposing the through-holes, the through-holes that retain the size of the mesh and the through-holes that adsorb not only the surfaces of the walls that form the through-holes but also the laminated surfaces of the two-dimensional network structures are provided. Since it is formed, a gas removal filter having high air permeability and a long life can be obtained.

  In addition, when a plurality of two-dimensional network structures having different aperture ratios are stacked, the two-dimensional network structure having the smallest aperture ratio is stacked so that the aperture ratio is the same as the aperture ratio of the filter itself. Since the contactable area between the adsorption site and the gaseous impurity component is increased without reducing the rate, a gas removal filter having high air permeability and high removal efficiency can be obtained.

  When the two-dimensional network structure is stacked, the mesh of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure is parallel to the air traveling direction when air is taken in. By arranging continuously, the direction of the air passage provided by the through-hole formed by the mesh lamination is parallel to the traveling direction of the air when taking in the air, so that the air is received. A gas removal filter having the least resistance and high air permeability can be obtained.

  In addition, when stacking two-dimensional network structures, the thickness of the network is viewed from the direction of air flow when air is taken in the meshes of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure. Since the direction of the air passage provided by the through-holes formed by the mesh stack is inclined with respect to the direction of air travel when air is taken in The amount of air passing through the filter without contacting the wall surface of the mouth is reduced, and the wall surface length of the through-hole is longer than in the case where the filter is not inclined, so that a gas removal filter with high gas removal efficiency can be obtained.

  In addition, when stacking two-dimensional network structures, the number of meshes per unit area is the same, and the thickness of the upstream two-dimensional network structure is adjacent to the downstream two-dimensional network structure. By using the one smaller than the thickness, the through-hole formed by the mesh lamination becomes gradually smaller as it goes downstream, reducing the air passing through the filter without contacting the wall surface of the through-hole and removing gas A highly efficient gas removal filter can be obtained.

  In addition, with respect to the mesh of the two-dimensional network structure on the most upstream side, adjacent meshes are alternately closed, and the mesh of the two-dimensional network structure on the most downstream side is opposite to that of the upstream two-dimensional network structure. As the adjacent meshes are alternately closed so that the air flows, the air is forced to move to the adjacent through-holes through the stack of the two-dimensional network structures, and the two-dimensional network structure is less likely to contact the air. Since adsorption sites existing in the vicinity of the contact points between the objects act efficiently, a gas removal filter with high gas removal efficiency can be obtained.

  Further, by inserting a plurality of rod-shaped members when laminating the two-dimensional network structure, the meshes are automatically aligned, so that a gas removal filter that can easily stack the two-dimensional network structure can be obtained.

  Further, since the air passage provided by the through-hole is automatically bent due to the bending of the rod-shaped member, the length of the air passage can be increased, so that a gas removal filter with high gas removal efficiency can be obtained. Obtainable.

  In addition, a fine sheet with air permeability is provided on the upstream surface, downstream surface, or both surfaces of the filter, so that the adsorbent may fall off the filter even when subjected to external force such as impact or vibration. A gas removal filter in which the adsorbent does not flow downstream can be obtained.

  Moreover, since the sheet | seat provided in the upstream surface of the filter, the downstream surface, or both surfaces has adsorption | suction ability, the gas removal filter which can adsorb | suck a larger amount of gaseous impurity components can be obtained.

  Moreover, the sheet | seat provided in the upstream surface of the filter, the downstream surface, or both surfaces has a function which collects the dust in air, and collects not only the gaseous impurity component but the dust in the air. The gas removal filter which can be obtained can be obtained.

  Further, since the adsorption functional group is present in the two-dimensional network structure, it is possible to obtain a gas removal filter capable of efficiently adsorbing the gaseous impurity component and suppressing the re-release of the gaseous impurity component.

  Further, since the adsorbent is carried on the two-dimensional network structure, a large amount of gaseous impurity components can be adsorbed.

  Moreover, since it is formed in a pleat shape, it is possible to obtain a gas removal filter that has higher air permeability and that further enhances the collection performance of gaseous impurity components and dust in the air.

  In order to achieve the above object, the gas removal filter of the present invention is a gas removal filter formed by laminating two-dimensional network structures having adsorbing ability, and has a mesh pattern with respect to the direction of air travel when air is taken in. By arranging the two-dimensional network structure continuously in a uniform manner, a through-hole that maintains the size of the mesh is formed. A state where the meshes are aligned with respect to the direction of air movement when air is taken in. Specifically, the two-dimensional network structure existing on the downstream side does not block the two-dimensional network structure on the upstream side. In addition, since the two-dimensional network structure is continuously arranged, the filter has an inner diameter close to the size of the mesh and has a through-hole that penetrates from the most upstream side to the most downstream side, Air selectively flows through this through hole. Therefore, a narrow space is formed as in the case where the meshes are randomly stacked, and the pressure loss does not increase greatly, and the air permeability is provided. Furthermore, since the size of the through-hole can be easily changed by changing the size of the mesh, it is easy to freely change the contact efficiency such as making the eyes fine when the gas removal filter is thin. is there.

  In addition, when a plurality of two-dimensional network structures having different aperture ratios are stacked, the two-dimensional network structure having the smallest aperture ratio is stacked so that the aperture ratio is the same as the aperture ratio of the filter itself. It is what. When two-dimensional network structures with the same shape are overlapped, the two-dimensional network structures come in contact with each other and block the adsorption site, making it difficult to fully utilize the adsorption performance of the filter, but two-dimensional network structures with different aperture ratios. When the objects are stacked, the contact area between the two-dimensional network structures decreases, and the portion blocking the adsorption site decreases, so that the adsorption site can be used efficiently. In addition, the aperture ratio of the gas removal filter itself can be maintained by stacking so that the mesh of the two-dimensional network structure having the smallest aperture ratio is not blocked by the two-dimensional network structure having a large aperture ratio. Since it can, it has the effect | action that air permeability is not impaired.

  When the two-dimensional network structure is stacked, the mesh of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure is parallel to the air traveling direction when air is taken in. By arranging continuously, the direction of the air flow path provided by the through-hole formed by the lamination of the mesh is parallel to the air traveling direction when taking in the air. Is. Since the through-hole is parallel to the air traveling direction when taking in the air, it has an effect that the resistance received by the inflowing air from the wall surface of the through-hole is reduced and the pressure loss is reduced.

  In addition, when stacking two-dimensional network structures, the thickness of the network is viewed from the direction of air flow when air is taken in the meshes of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure. The direction of the air passage provided by the through-holes formed by the mesh stack is inclined with respect to the air traveling direction when taking in air. It is what. If the gas removal filter is thin, the contact time with the adsorption site may be short, so it may not be possible to remove the gaseous impurity component. However, the progress of the air when taking in air through the ventilation path provided by the through hole By inclining with respect to the direction, air easily contacts the wall surface, reducing the air passing through the gas removal filter without contacting the adsorption site, and increasing the length of the wall surface of the through-hole and increasing the contact time. It has the effect of high gas removal efficiency.

  In addition, when stacking two-dimensional network structures, the number of meshes per unit area is the same, and the thickness of the upstream two-dimensional network structure is adjacent to the downstream two-dimensional network structure. By using a material having a thickness smaller than that of the thickness, the through-hole formed by the lamination of the mesh gradually decreases as it goes downstream. By doing so, the air passage provided by the through-hole becomes a mortar-like shape, making it easy for air to contact the wall surface, reducing the air passing through the filter without contacting the adsorption site, and increasing the length of the wall surface of the through-hole. Therefore, the contact time is long, and the gas removal efficiency is high.

  In addition, with respect to the mesh of the two-dimensional network structure on the most upstream side, adjacent meshes are alternately closed, and the mesh of the two-dimensional network structure on the most downstream side is opposite to that of the upstream two-dimensional network structure. The adjacent meshes are alternately closed so as to be. By passing air in the direction perpendicular to the traveling direction of air when air is taken in between the layers of the two-dimensional network structure, that is, when the air is taken in, the filtration area is increased and the air passing speed is reduced. It has the effect of enhancing the air permeability and the collection performance of gaseous impurity components and dust.

  In addition, when the two-dimensional network structure is laminated, a plurality of rod-like members are inserted to automatically align the mesh. When a plurality of through-holes are fixed by the rod-shaped member, the meshes are aligned at places other than the fixed portion, so that the through-holes having the same shape are formed easily and automatically.

  Further, since the rod-like member is bent, the air passage provided by the through hole is automatically bent. Since the two-dimensional network structure is laminated along the bent rod-shaped member, the air passage provided by the through hole is automatically bent, and the air passage is also bent at a place other than the fixed portion. Have. Moreover, it has the effect | action that the shape of the ventilation path provided by the through-hole can be easily changed by changing the shape of a rod-shaped member.

  Further, a fine sheet having air permeability is provided on the upstream surface or downstream surface of the filter, or both surfaces. For example, it is important to prevent the adsorbent carried on the surface of the two-dimensional network structure from dropping off from the filter and to prevent the adsorbent from flowing out to the downstream side of the filter in order to prevent contamination of air and the use environment. By providing a sheet that is breathable but finer than the size of the adsorbent on the upstream surface, downstream surface, or both surfaces of the filter, the adsorbent falls off the filter, or the adsorbent is downstream of the filter. It has the effect that it can be prevented from flowing out to the side.

  Moreover, the sheet | seat provided in the upstream surface of the filter, the downstream surface, or both surfaces has the adsorption | suction ability. By using as a sheet a fiber group having an adsorption capacity such as an ion exchange nonwoven fabric, it has an effect of increasing the adsorption capacity of the entire filter and extending the life.

  Moreover, the sheet | seat provided in the upstream surface of the filter, the downstream surface, or both surfaces has the function to collect the dust in air. For example, by providing polypropylene on the upstream surface or downstream surface of the filter, or both surfaces, by forming a sheet by blowing polypropylene into a fiber form by melt-blowing and performing charging treatment, not only gaseous impurity components It has the effect | action that the gas removal filter which can also collect the dust in air can be obtained.

  Further, the adsorption functional group is present in the two-dimensional network structure. The adsorptive functional group has an action of removing gaseous impurity components by chemical adsorption or the like. In gas adsorption by chemical adsorption or the like, it is difficult to re-release the gaseous impurity component once adsorbed, so that a filter with less re-release can be provided. In addition, since the two-dimensional network structure has an adsorption capacity and plays the role of a base material and an adsorbent at the same time, it has a large total adsorption amount and a long life, and has a low pressure loss with a well-shaped through-hole. A filter can be provided.

  Also, the adsorbent is carried on the two-dimensional network structure. Since the adsorbent has a large amount of pores and gas adsorption sites, it has the action of adsorbing a large amount of gaseous impurity components, so that a long-life filter can be provided by supporting the adsorbent on a two-dimensional network structure. Can do.

  Moreover, it is formed in a pleated shape. Using a gas removal filter composed of a two-dimensional network structure with adsorption capacity as a filter medium, this filter medium is formed into a pleated shape, that is, a bellows shape, and air is passed through the pleat surface of the filter medium, thereby increasing the filtration area. Thus, the air passage speed is reduced, and the air permeability and the performance of collecting gaseous impurity components and dust are improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
In the gas removal filter formed by laminating the two-dimensional network structure 1 having adsorbability, the air passage 6 provided by the through-hole 3 is aligned with the air traveling direction 2 when air is taken in. FIG. 1 shows a perspective view of a gas removal filter in which the two-dimensional network structure 1 is continuously arranged so that it is parallel to the air traveling direction 2 when the air is taken in. A side cross-sectional view at the position is shown in FIG. As shown in FIGS. 1 and 2, a through-hole 3 having a diameter substantially the same as that of the mesh is formed by the mesh of the two-dimensional network structure 1 arranged continuously.

  Although not shown in FIG. 1, the two-dimensional network structure 1 has a particulate adsorbent 5 supported on the surface of the two-dimensional network structure 1 as shown in FIG. Therefore, the gas flowing in from the ventilation direction selectively passes through the inside of the through-hole 3 as shown in the example 4 of the air flow, and the gaseous impurity component contained in the air is granular supported on the wall surface of the through-hole 3. It is removed by contacting and adsorbing to the adsorbent 5.

  Examples of the shape of the mesh of the two-dimensional network structure 1 include shapes that are easily arranged regularly, such as polygons and circles. The mesh size of the two-dimensional network structure 1 is preferably an average radius of about 0.5 to 10 mm because sufficient air permeability is obtained. Moreover, since the thickness of the net | network of the two-dimensional network structure 1 is about 0.1-3 mm, since the load amount of adsorption agent can be increased, maintaining the intensity | strength as a base material, it is preferable. The thickness of the two-dimensional network structure 1 is preferably about 0.1 to 3 mm. However, when the filter thickness is as thin as possible, the number of layers that can be stacked increases, so the area on which the adsorbent can be supported increases. In addition, there is an advantage that the shape of the air passage 6 formed by the through-hole 3 can be easily changed.

  The number of stacked layers varies depending on the application and required performance, but is preferably about 5 to 50 because the shape of the through-hole 3 formed is easily stabilized. Since the shape of the two-dimensional network structure 1 greatly affects the pressure loss, the adsorption efficiency, and the like, it is preferable to determine in consideration of the required pressure loss, the filter thickness, and the like.

  Examples of the material of the two-dimensional network structure 1 include a plastic net, a net woven with organic fibers and inorganic fibers, a metal wire net, and a punching metal. A non-volatile resin is used because it does not generate gaseous impurity components or particulate impurity components from itself, and is flexible and highly elastic so that it will not be damaged even if it is subjected to pleating or external impact. It is desirable to use it.

  The particulate adsorbent 5 to be supported has a particulate shape, and various types are exemplified, and mainly activated carbon, ion exchange resin, zeolite, etc. are mentioned, and the particle diameter is preferably about 0.2 to 10 mm. . Adsorbed activated carbon and cationic ion exchange resins impregnated with acids such as phosphoric acid are used for adsorption and collection of alkaline gases such as ammonia, and carbon dioxide is used for adsorption and collection of acidic gases such as hydrochloric acid gas, sulfuric acid gas, nitric acid gas and boron. An impregnated activated carbon or an anion ion exchange resin impregnated with potassium or the like is often used, and an adsorbed activated carbon not adhering with a chemical substance is often used for the adsorption and collection of organic gases such as dioctyl phthalate, dibutyl phthalate and toluene. In addition, the particle diameter may not be uniform, and when the wall surface of the through-hole 3 is uneven, a method such as changing the particle diameter of the granular adsorbent 5 for every two-dimensional network structure 1 is used. May be.

  As an adhesive used for supporting the particulate adsorbent 5 on the two-dimensional network structure 1, it is preferable to use an adhesive having adhesiveness even at room temperature because the particulate adsorbent 5 can be easily supported. Examples of the pressure-sensitive adhesive include acrylic, vinyl acetate, and urethane-based pressure-sensitive adhesives. In particular, when a hot melt pressure-sensitive adhesive is used that has been added to SIS or SBS thermoplastic polymer, the adhesive itself This is preferable because it has an advantage that almost no gaseous impurity components are generated from the above.

  As a method for supporting the particulate adsorbent 5 on the two-dimensional network structure 1, the surface of the two-dimensional network structure 1 is obtained by impregnating the two-dimensional network structure 1 with an aqueous slurry in which an adhesive is dispersed in water and then drying. For example, after adhering an adhesive to the two-dimensional network structure 1, the particulate adsorbent 5 is sprinkled on the two-dimensional network structure 1.

  Alternatively, the adhesive is attached to the surface of the two-dimensional network structure 1 by spraying it on the two-dimensional network structure 1 in a state where the hot-melt pressure-sensitive adhesive is kept at the melting temperature or higher and the flowability of the adhesive is increased. And the like, and then the particulate adsorbent 5 is sprinkled and supported on the two-dimensional network structure 1. By such a method, the particulate adsorbent 5 is uniformly dispersed and supported on the surface of the two-dimensional network structure 1.

  In this embodiment, the particulate adsorbent 5 is carried. However, when the powdery adsorbent is carried on the two-dimensional network structure 1 or an adsorbing functional group is introduced, the adsorbent is loaded. This is preferable because the deformation of the mesh shape is suppressed as much as possible. The powdery adsorbent to be supported is in the form of a powder, and various types can be mentioned, but mainly the above-mentioned impregnated activated carbon impregnated with an acid or alkali component, non-adherent charcoal or ion exchange resin without any adhering, Zeolite etc. are mentioned, and an average particle size of about 10 μm to 500 μm is desirable. By adsorbing such a powdery adsorbent on the two-dimensional network structure 1, it is possible to impart adsorbability.

  As a supporting method, the two-dimensional network structure 1 is immersed in a slurry in which a powdery adsorbent is dispersed in a binder such as colloidal silica and then dried, or a hot melt resin adhesive and a powdery adsorbent are mixed. It is desirable to apply powder and heat and cool, or add a powdery adsorbent to the two-dimensional network structure 1 in advance. When importance is attached to prevention of powder falling, adsorbing functional groups are introduced into the two-dimensional network structure 1 by graft polymerization or the like without using a powdery adsorbent, or the two-dimensional network structure 1 It is preferable to introduce adsorbing functional groups in advance by mixing ion exchange fibers, activated carbon fibers, and the like.

(Embodiment 2)
Gas laminated so that the aperture ratio of the two-dimensional network structure 1 having the smallest aperture ratio is the same as the aperture ratio of the filter itself when a plurality of two-dimensional network structures 1 having different aperture ratios are stacked. A side sectional view of the removal filter is shown in FIG. Originally, the particulate adsorbent 5 is present on the surface of the two-dimensional network structure 1, but is omitted for easy understanding of the filter structure. In the gas removal filter shown in this embodiment, the size of the two-dimensional network structure 1 having a large aperture ratio is an integral multiple of the two-dimensional network structure 1 having a small aperture ratio, for example, in the gas removal filter shown in FIG. The two-dimensional network structure 1 having a larger aperture ratio and the two-dimensional network structure 1 having a smaller aperture ratio are alternately laminated so that the skeletons of the respective networks overlap each other in a projection manner.

  For this reason, the space 7 is formed in the portion of the two-dimensional network structure 1 having a large aperture ratio where there is no net skeleton. Accordingly, the skeleton of the two-dimensional network structure 1 having a small aperture ratio is not blocked, and the adsorption site in this portion can be efficiently used, and at the same time, the two-dimensional network structure 1 having a small aperture ratio. As a result, when a plurality of two-dimensional network structures 1 having different aperture ratios are stacked, the aperture ratio of the two-dimensional network structure 1 having the smallest aperture ratio is the aperture ratio of the filter itself. Therefore, it is possible to prevent a wasteful increase in pressure loss.

  As shown in FIG. 3, there is a portion where adjacent ventilation paths 6 are connected by a space 7 formed by the two-dimensional network structure 1 having a large aperture ratio. Since the air can go back and forth between the air passages 6, the pressure loss is reduced. Further, since the two-dimensional network structures 1 are less in contact with each other than in the case where the adjacent ventilation paths 6 are not connected as shown in FIG. The capacity can be increased.

(Embodiment 3)
When the two-dimensional network structure 1 is stacked, the network viewed from the air traveling direction 2 when air is taken in the mesh of the downstream two-dimensional network structure 1 adjacent to the upstream two-dimensional network structure 1. The direction of the air passage 6 provided by the through-holes 3 formed by mesh lamination is inclined with respect to the air traveling direction 2 when air is taken in. FIG. 4 shows a side sectional view of the gas removal filter. Originally, the particulate adsorbent 5 is present on the surface of the two-dimensional network structure 1, but is omitted for easy understanding of the filter structure.

  As shown in FIG. 4, the meshes are shifted little by little so that the length of the air passage 6 is inclined and becomes longer. As a result, the air passage 6 provided by the through-hole 3 is inclined with respect to the air traveling direction 2 when air is taken in. Therefore, the length of the ventilation path 6 provided by the through-hole 3 is longer than that of the non-inclined one, and the gas contact time can be extended. Further, as shown in the example 4 of the air flow, since the air travels along the wall surface of the through hole 3, the air easily comes into contact with the wall surface of the through hole 3, and the air passing through the filter is reduced without contacting the adsorption site. Removal efficiency is increased.

  As the angle of inclination increases, the length of the air passage 6 provided by the through-hole 3 can be increased. However, since the pressure loss increases, it is desirable to change according to the required performance.

  Preferably, if the inclination is such that the opposite side is visible when viewed from the air traveling direction 2 when air is taken in, the effect can be obtained without significantly impairing the air permeability.

(Embodiment 4)
When the two-dimensional network structure 1 is stacked, the number of meshes per unit area is the same, and the mesh of the upstream two-dimensional network structure 1 is adjacent to the downstream two-dimensional network structure 1 network. FIG. 5 shows a side cross-sectional view of the gas removal filter that gradually decreases as the through-hole 3 formed by the lamination of the meshes becomes the downstream side by using the one having a thickness smaller than the thickness. Originally, the particulate adsorbent 5 is present on the surface of the two-dimensional network structure 1, but is omitted for easy understanding of the filter structure.

  As shown in FIG. 5, since the thickness of the mesh of the two-dimensional network structure 1 gradually increases as it goes downstream, the diameter of the through-hole 3 becomes smaller as it goes downstream. Since the wall length is longer than when the thickness is uniform and the diameter of the through-hole 3 is uniform, the contact efficiency is increased. Further, since the shape of the air passage 6 provided by the through-hole 3 is a mortar shape, the air travels along the wall surface of the through-hole 3, so that the air easily contacts the wall surface of the through-hole 3 and comes into contact with the adsorption site. Since the air passing through the filter can be reduced without any increase, the removal efficiency is increased.

  Further, the two-dimensional network structure 1 is set so that the thickness of the two-dimensional network structure 1 on the most upstream side is about 30 to 80% of the thickness of the two-dimensional network structure 1 on the most downstream side. Is preferable because the length of the wall surface of the through-hole 3 can be increased without impairing the amount of the particulate adsorbent 5 carried and the gas removal efficiency is increased.

(Embodiment 5)
Regarding the mesh of the two-dimensional network structure 1 on the most upstream side, the adjacent meshes are alternately closed, and the two-dimensional network structure 1 on the upstream side of the mesh of the two-dimensional network structure 1 on the most downstream side is defined as FIG. 6 is a side sectional view of a gas removal filter in which adjacent meshes are alternately closed so as to be reversed. Originally, the particulate adsorbent 5 is present on the surface of the two-dimensional network structure 1, but is omitted for easy understanding of the filter structure.

  As shown in FIG. 6, the gas that has flowed in cannot be passed straight through the filter in the air travel direction 2 when air is taken in because the most downstream mesh is blocked. Therefore, the air travels in a direction orthogonal to the air travel direction 2 when taking in the air so as to cover a gap existing between the two-dimensional network structure 1 stacks, and moves to the adjacent through-hole 3 again. It goes straight in the air traveling direction 2 when taking in air. Therefore, the flow area when the filtration area increases and the air passes is smaller than when the air goes straight and passes through the gas removal filter, the adsorption and collection performance of gaseous impurity components is improved, and the pressure loss is increased. The effect of reducing and improving air permeability is obtained.

  In addition, since air passes through all the surfaces of the two-dimensional network structure 1, the adsorption sites sandwiched between the two-dimensional network structure 1 can be used effectively, so that the lifetime is increased. In the case of this embodiment, if the two-dimensional network structures 1 are too close to each other, there is no gap through which air passes. Therefore, when the granular adsorbent 5 or the like is used as the adsorbent, the gap between the adsorbents is automatically reduced. Since it becomes a passage, it is preferable.

  As a method of closing the mesh, the same material as that of the two-dimensional network structure 1 in which the mesh is alternately closed in advance may be used, or after the adsorbent is loaded, the air-permeable material 8 may be used. The non-breathable material 8 is not particularly limited, but it is preferable to use the above-described hot melt adhesive or the like with less gassing property.

(Embodiment 6)
FIG. 7 shows a side sectional view of the gas removal filter in which the air passage 6 provided by the through-hole 3 is automatically bent by bending the rod-like member 9. Originally, the particulate adsorbent 5 is present on the surface of the two-dimensional network structure 1, but is omitted for easy understanding of the filter structure. As shown in FIG. 7, since the two-dimensional network structure 1 is continuously laminated along the rod-shaped member 9, the air passage 6 provided by the through-hole 3 at a position away from the rod-shaped member 9 is also automatically provided. The shape is the same as that of the rod-shaped member 9.

  Therefore, if the rod-shaped member 9 is installed outside the area where the filter takes in air, the shape of the through-hole 3 can be fixed without reducing the aperture ratio. Moreover, since the shape of the ventilation path 6 provided by the through-hole 3 can be changed only by changing the shape of the rod-shaped member 9, it is possible to easily form the ventilation path 6 having a shape that is difficult to form normally.

  Examples of the shape of the rod-shaped member 9 include a straight line, a wavy shape, a spiral, a zigzag, or a combination thereof. The filter shape becomes more stable as the number of rod-shaped members 9 increases. However, if the rod-shaped member 9 is present in the air passage surface, the pressure loss increases, so that it is fixed at the frame portion outside the area where the filter takes in air. It is preferable to do. If the thickness of the rod-shaped member 9 is approximately the same as that of the mesh, the fixing is preferable. If the shape of the cross section is the same as that of the mesh, the fixing may be further increased.

  Further, the material of the rod-shaped member 9 may be made of a resin having low gas generating property when installed in the air passage surface, but it is preferable to install it outside the air passage surface because it can be more firmly fixed with a metal such as stainless steel.

(Embodiment 7)
The gas removal filter described in the first embodiment is used as the gas removal filter medium 10, and fine sheets 11 having air permeability are provided on both sides of the filter, and the sheet 11 has an adsorbing capacity to collect dust. FIG. 8 shows a perspective view of a gas removal filter having a collecting function. As the sheet 11 having air permeability and fine mesh, specifically, a non-woven fabric obtained by combining fibers with heat or a resin binder to form a sheet is used.

  Even if the granular adsorbent 5 is fixed to the two-dimensional network structure 1, the granular adsorbent 5 does not necessarily drop off from the two-dimensional network structure 1, and the granular adsorbent 5 flows out to the downstream side during use. Or the particulate adsorbent 5 may fall off the filter during handling and contaminate the use environment. By providing the sheets 11 on the upstream surface and the downstream surface of the filter, the particulate adsorbent 5 can be prevented from falling off the filter. As the sheet 11, a nonwoven fabric having a fiber diameter of 1 μm or more and 50 μm or less manufactured by a spunbond method or a thermal bond method and having a vent hole diameter of 5 μm or more and 100 μm or less is suitably used according to the particle size of the granular adsorbent 5 to be used. If used, it is preferable because it prevents contamination on the downstream side without omission.

  Also, a dust collecting filter medium having a function of collecting dust as the sheet 11, for example, polypropylene is blown into a fiber by a melt blow method to form a sheet, and an electrostatic filter medium or glass fiber prepared by charging is combined with a squeeze binder. By using such a glass fiber filter medium, it is possible to efficiently collect not only gaseous impurity components but also dust in the air, and it can be used as an air purification filter in an indoor environment such as a home or office. Further, when ion exchange fibers, activated carbon fibers, or the like are added at the time of producing the sheet 11 to provide adsorption ability, the total adsorption amount of the filter is increased and the life can be extended.

  In addition, although the gas removal filter of a present Example has provided the sheet | seat 11 in the upstream surface and the downstream surface, if the adsorbent is completely fixed to the two-dimensional network structure 1 so that it may not fall off from the filter, it is a sheet | seat. Even if 11 is provided on either the upstream surface or the downstream surface, or the sheet 11 is not provided, a gas removal filter having the same effect can be obtained.

  Examples of the sheet 11 include various kinds of organic fibers, inorganic fibers, resins, and the like. In addition, an adsorption functional group is introduced into the sheet 11 by graft polymerization, or ion exchange fibers, activated carbon fibers, and the like are mixed in advance. In this case, the total adsorption capacity is increased and the adsorption efficiency is increased.

(Embodiment 8)
FIG. 9 shows a perspective view of a gas removal filter in which the gas removal filter described in Embodiment 1 is used as the gas removal filter medium 10 and the gas removal filter medium 10 is formed in a pleat shape. In order to form the pleat shape, the gas removal filter medium 10 is easily bent, and it is necessary that the bent portion does not break. Therefore, the material of the two-dimensional network structure 1 is preferably a resin.

  When the gas removal filter medium 10 is formed in a pleat shape, the filtration area increases as compared with a flat plate that is not formed in a pleat shape, and the flow rate when air is allowed to pass is reduced. Adsorption and collection performance is improved, and pressure loss is reduced and air permeability is improved. In addition, when the gas removal filter medium 10 is pleated, if the pleat depth is 20 mm or more and the pleat interval is 2 mm or more, air can easily pass between the pleat ridges, improving air permeability and adsorption collection performance. Therefore, it is preferable. Further, it is preferable that the gas removal filter medium 10 has a thickness of 1 mm or more and 10 mm or less because it can be easily folded into a pleated shape.

  The gas removal filter of the present invention has high air permeability and adsorption capacity, has a long life, and can remove gaseous impurity components over a long period of time while reducing the power cost for air blowing of an air purifier equipped with the gas removal filter. It can be used as a filter.

The perspective view of the gas removal filter as described in Embodiment 1 of this invention Side surface sectional drawing of the gas removal filter as described in Embodiment 1 Side surface sectional drawing of the gas removal filter as described in Embodiment 2 Side surface sectional drawing of the gas removal filter as described in Embodiment 3 Side surface sectional drawing of the gas removal filter as described in Embodiment 4 Side surface sectional drawing of the gas removal filter as described in Embodiment 5 Side surface sectional drawing of the gas removal filter as described in Embodiment 6 Side surface sectional drawing of the gas removal filter as described in Embodiment 7 Side surface sectional drawing of the gas removal filter as described in Embodiment 8

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Two-dimensional network-like structure 2 Air moving direction at the time of taking in air 3 Through-hole 4 Example of air flow 5 Granular adsorbent 6 Air passage 7 Space 8 Non-breathable material 9 Bar-shaped member 10 Gas removal filter medium 11 Sheet

Claims (14)

In a gas removal filter formed by laminating two-dimensional network structures with adsorption capacity, by arranging the two-dimensional network structures continuously with the mesh aligned with the direction of air movement when air is taken in A gas removal filter characterized in that a through-hole holding the size of the mesh is formed. When two or more two-dimensional network structures having different aperture ratios are stacked, the two-dimensional network structure having the smallest aperture ratio is stacked so that the aperture ratio is the same as the aperture ratio of the filter itself. The gas removal filter according to claim 1. When stacking a two-dimensional network structure, the network of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure is parallel to the air traveling direction when air is taken in The direction of the air flow path provided by the through-hole formed by the lamination of the mesh is parallel to the traveling direction of the air when taking in the air. The gas removal filter according to 1 or 2. When stacking a two-dimensional network structure, it is smaller than the thickness of the mesh when viewed from the direction of air flow when taking in the mesh of the downstream two-dimensional network structure adjacent to the upstream two-dimensional network structure. It is characterized by the fact that the direction of the air passage provided by the through-holes formed by laminating the mesh is inclined with respect to the air traveling direction when taking in the air, continuously arranged with a shift by a distance. The gas removal filter according to any one of claims 1 to 3. When stacking two-dimensional network structures, the number of meshes per unit area is the same, and the thickness of the upstream two-dimensional network structure is larger than the thickness of the adjacent downstream two-dimensional network structure. 5. The gas removal filter according to claim 1, wherein by using a smaller one, the through-hole formed by the mesh lamination gradually becomes smaller toward the downstream side. As for the mesh of the two-dimensional network structure on the most upstream side, adjacent meshes are alternately closed, and the mesh of the two-dimensional network structure on the most downstream side is opposite to the upstream two-dimensional network structure. 6. The gas removal filter according to claim 1, wherein adjacent meshes are alternately closed. The gas removal filter according to any one of claims 1 to 6, wherein when the two-dimensional network structure is laminated, the meshes are automatically aligned by inserting a plurality of rod-shaped members. The gas removal filter according to claim 7, wherein the air passage provided by the through-hole is automatically bent by bending the rod-shaped member. The gas removal filter according to any one of claims 1 to 8, wherein a fine sheet having air permeability is provided on an upstream surface, a downstream surface, or both surfaces of the gas removal filter. The gas removal filter according to any one of claims 1 to 9, wherein a sheet provided on the upstream surface, the downstream surface, or both surfaces of the gas removal filter has adsorption ability. The gas removal filter according to any one of claims 1 to 10, wherein a sheet provided on an upstream surface, a downstream surface, or both surfaces of the gas removal filter has a function of collecting dust in the air. . The gas removal filter according to any one of claims 1 to 11, wherein an adsorption functional group is present in the two-dimensional network structure. The gas removal filter according to any one of claims 1 to 12, wherein an adsorbent is loaded on the two-dimensional network structure. The gas removal filter according to claim 1, wherein the gas removal filter is formed in a pleat shape.

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