JP2001239113A - Air cleaning filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaning filter generating no rise in pressure loss even if a flow rate of air increases suddenly, not destructed by air pressure, generating no clogging against fine particles such as a cloud of sand, or the like, capable of being regenerated by removing trapped fine particles, capable of being used stably over a long period of time and capable of adsorbing or photodecomposing a harmful substance such as a malodorous substance or an environmental pollutant. SOLUTION: In the air cleaning filter wherein fluted parts 1 and liner parts 2 are alternatly laminated, a large number of small holes 3 are bored in at least one of the fluted parts and the liner parts and air inflow and outflow ports are provided in the direction parallel to the surfaces of the liner parts and right-angled to the tangential lines of the contact parts of the fluted parts and the liner parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be used stably even when the flow rate of air suddenly increases and decreases, and without clogging even if the inflowing air contains fine particles.
The present invention relates to an air purifying filter capable of trapping fine particles, removing the trapped fine particles from the filter and regenerating the fine particles, and stably using the filter for a long time. Furthermore, it can adsorb or decompose and remove harmful substances such as dust and malodorous substances and environmental pollutants other than fine particles,
It relates to an air purification filter.

[0002]

2. Description of the Related Art A conventional air purifying filter is of a so-called filtration type, in which foreign substances are trapped in small gaps where fibers are entangled by passing air through a sheet made of various fibers. In other words, foreign substances have been removed by adsorption to a porous substance together with filtration.

[0003] In these filters, the inflowing air passes through in the thickness direction of the sheet-like material and is filtered. Therefore, when the inflowing air becomes extremely large in a short time, the pressure increases, and the sheet constituting the air cleaning filter is broken. Or the air purification filter itself was broken. Further, if fine particles such as sand and dust are mixed in the air, the sheet surface on the air inflow side is clogged, and the air does not pass and the function as a filter is not performed.

In order to solve the problem of the filter in which the pressure loss increases during use, a liner and a flute are alternately laminated to form a tubular passage as disclosed in Japanese Patent Application Laid-Open Nos. 4-4011 and 7-241491. It is known to lay parallel to the direction of air flow. However, Japanese Unexamined Patent Publication No.
In Japanese Patent Publication No. 11 (1999), since the activated carbon porous body is placed in parallel with the laminate in the direction perpendicular to the air flow, the amount of air flowing through both members changes due to a sudden increase or decrease in the amount of air, and the dust and the like in the air flow become porous. Some are deposited and removed, but are not filtered through the tubular passages of the laminate. Japanese Patent Application Laid-Open No. Hei 7-241491 similarly does not filter fine particles having a large mass such as dust.

[0005]

The problem to be solved by the present invention is as follows.
In addition, even if the flow rate of air suddenly increases or decreases, the pressure loss does not increase, and there is no breakage of the filter due to the increased air pressure.
Thirdly, it is possible to remove fine particles for a long time without clogging due to fine particles such as sand and dust, and thirdly, it is possible to remove trapped fine particles from a filter and regenerate the air, and to use the air cleaner stably for a long time. The purpose is to provide a chemical filter. It is a further object of the present invention to provide an air purifying filter capable of adsorbing or decomposing and removing harmful substances such as dust, malodorous substances and environmental pollutants other than fine particles.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have achieved the above-mentioned object with an air purifying filter having the following configuration.

[0007] (1) In an air purifying filter in which a flute portion and a liner portion are alternately laminated, a plurality of small holes are formed in at least one of the flute portion and the liner portion, and The invention also provides an air purifying filter, wherein an air outflow / inlet port is provided in a direction perpendicular to a tangent line at which the flute portion and the liner portion contact each other. (2) In an air purifying filter in which a flute portion and a liner portion are alternately laminated, a plurality of small holes are formed in the liner portion and the flute portion, and an air outflow / inlet port is provided at right angles to the liner surface. It is an invention of an air purifying filter characterized by the following. (3) The air purifying filter according to (2), wherein the tangents at which the flute portion and the liner portion contact each other are laminated so that the tangents are parallel to each other, and the tangents are used horizontally or inclined. is there. (4) The invention of the air purifying filter according to (2), wherein the flute portion and the liner portion are laminated so that tangents at which the flute portion and the liner portion contact each other are not parallel. (5) The side surface other than the air outflow / inlet is sealed with a housing, and the housing portion of the cylindrical opening formed by the flute portion and the liner portion can be detached (1), (2), (3)
Or, the invention of the air purifying filter according to (4). (6) At least one of the flute portion and the liner portion is provided with one of a photocatalyst, a deodorant, and an adsorbent supported or contained therein (1), (2),
(3) The invention of the air purifying filter according to (4) or (5). (7) At least one of the flute portion and the liner portion is electretized (1),
(2), (3), (4), (5) or (6). (8) The flute portion or the liner portion is a nonwoven fabric
(1), (2), (3), (4), (5), (6) or (7).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an air purifying filter of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in the air cleaning filter of the present invention, the flute portions 1 and the liner portions 2 are alternately laminated so that the grooves of the flute portions are parallel. According to the invention of claim 1, as shown in FIG. 2, the laminate of FIG.
In addition, it is cut at a plane parallel to a tangent line at which the flute part and the liner part come into contact), and is parallel to the liner surface.
The air purifying filter has a structure in which air flows in and out at a right angle to a tangent line at which the flute portion and the liner portion come into contact. In the invention of claim 1, a plurality of small holes 3 are formed in at least one of the flute portion and the liner portion.

A second aspect of the present invention is an air purifying filter having a structure in which the laminate of FIG. 1 is not cut on the a-plane and air flows in and out of the liner surface at right angles as shown in FIG. . In the case of FIG. 3, the air flows at right angles to the liner surface with respect to the air flow flowing in and out in the horizontal direction, and at right angles to the tangent line formed by the contact between the flute portion and the liner portion, and horizontally. A cleaning filter is installed. Claim 3
According to the invention, when the tangent formed by the contact between the flute portion and the liner portion is installed so as to be horizontal or oblique to the air flowing in and out in the horizontal direction, the trapped fine particles cause the flute portion and the liner portion to be in contact with each other. It is preferable because it is fixed in a narrow gap. The invention of claim 4 is an air purifying filter in which the flute members of FIG. 3 are laminated such that tangent lines formed by contact between the flute portion and the liner portion are not parallel. For example, when some flutes and other flutes are stacked so as to be at a right angle, a cylindrical opening composed of a flute and a liner is formed on each side of the rectangle, so that continuous operation can be performed. The trapped fine particles can be discharged.

According to a fifth aspect of the present invention, as shown in FIG. 4, a side surface which is not an air outflow / inlet port is closed by a housing 4, and a cylindrical opening formed by a flute portion and a liner portion is formed. This is an air purifying filter capable of discharging trapped fine particles by allowing the housing portion 5 to be detachable.

FIG. 4 shows an invention of an air purifying filter in which a detachable housing portion 5 is provided on a lateral side of the air purifying filter according to the third aspect of the present invention.

In the present invention, the plurality of small holes formed in the flute portion and the liner portion need to have an opening diameter enough to allow fine particles such as dust to pass through, and are adjusted according to the size of the fine particles mixed with air. . The positions are evenly distributed and opened. The outermost liner portion in FIG. 2 does not need to have a small hole. Further, in the air purifying filter according to the first aspect of the present invention as shown in FIG. 2, depending on the application, it is possible that either the flute portion or the liner portion does not have a hole. In this case, it is preferable that a hole is formed in the flute portion of the air outflow / inlet port. When a plurality of small holes are formed only in the flute portion, when used for outflow / inflow air other than vertical, fine particles in the air tend to be unevenly distributed below the inflow air (underflow of the air flow) due to the specific gravity of the fine particles. Therefore, the particles settled by the liner portion and the flute portion near the bottom can be trapped and removed without soiling other flutes.
When fine particles having a low specific gravity are mixed in the entire inflow air, it is preferable to increase the path length of the air and make small holes in the flute portion and the liner portion in order to trap the fine particles in the entire filter. The repetition of waves in the flute portion may be adjusted according to the application, and it is preferable that at least two or more cylindrical hollow portions are provided in the air flow direction. In the air purifying filter according to the first aspect, the liner member also functions as a mechanical reinforcing member against air pressure.

Further, if a hole is not formed in a portion where the liner portion and the flute portion are in contact with each other or in the vicinity thereof, the fine particles are easily trapped in a narrow space, and the separation is not repeated, so that the trapping of the fine particles is more efficient. be able to.

According to a second aspect of the present invention, there is provided an air purifying filter having a structure in which air flowing in and out flows at right angles to the liner surface and also at right angles to a tangent line at which the flute portion and the liner portion come into contact with each other. In the case of, when the outflow and inflow air other than vertical is used, the trapped fine particles are trapped by the attractive force so as to be sandwiched in a narrow space formed by the contact between the flute portion and the liner portion. It is preferable because the amount of the fine particles soared by the increase or decrease of the amount is extremely small. In particular, it is preferable to use the tangent line horizontally so that the fine particles are efficiently trapped in the narrow space between the liner portion and the flute portion by gravity. The repetition of the lamination of the flute portion and the liner portion may be adjusted according to the application, and it is preferable that at least two or more hollow portions are provided in the air flow direction.

A plurality of small holes 3 are formed in the flute portion and the liner portion. The opening area occupied by the entire hole depends on the amount of air and the opening diameter.
~ 95% is appropriate. The number of holes may be adjusted depending on the application, but can be set from the designed opening diameter and opening area ratio.

The opening diameter of the holes may be slightly larger than the particle diameter. Preferably, it is about 1.2 to 100 times the particle diameter. Also, since the fine particles have a particle size distribution,
By increasing the opening diameter on the upstream side and decreasing the opening diameter on the downstream side, the fine particles having larger diameters can be sequentially trapped. For example, in the upstream part, the opening diameter is made larger than the maximum particle diameter, and the average particle diameter of 2 to 2 goes downstream.
It is preferable to provide a hole having an opening diameter that is seven times as large as the opening diameter, and to provide a hole having an opening diameter as small as one third of the average particle diameter in the downstream portion. When the upstream area and the downstream area are equal or the upstream area is designed to be slightly larger, the entire opening area is preferably uniform since the pressure loss is uniform.

It is also possible to change the opening area ratio from upstream to downstream. For example, in the case where air containing fine particles such as dust is blown rapidly, the opening diameter and the opening area ratio are increased on the upstream side, and the opening diameter and the opening area ratio are reduced on the downstream side to trap large dust and the like, and Sudden inflow pressure can be alleviated by the entire structure in the thickness direction of the filter and can be preferably used. The air purifying filter of the present invention seals the side that is not the outflow / inflow port of the air with a housing to have strength and at the same time prevent leakage to the side, but is preferably formed by a flute portion and a liner portion. By making the housing portion of the cylindrical opening detachable, the trapped fine particles can be cleaned by removing the detached portion. The fine particles can be efficiently removed by using the detachable housing part on the lower side or by rotating the lower part to remove the detachable part.

FIG. 5 shows the action of the present invention for trapping fine particles.
It will be explained by. FIG. 5 is a side sectional view in which the flute portion and the liner portion are laminated, the flute portion and the liner portion are linear, and the outflow and inflow ports of air are left and right. Represents the streamline of the flow. In the cylindrical space formed by the flute portion and the liner portion, the flow of air is entrained, and in the turbulent flow, the fine particles are trapped in the narrow gap formed by the flute portion and the liner portion. Some are trapped in the next space even if they soar again. Further, even if the flow of air rapidly increases or decreases, only the velocity of the fluid passing through the holes changes, and it is unlikely to be broken by pressure as in a normal sheet-like filtration filter.

A photocatalyst, a deodorant or an adsorbent can be carried on the flute portion or the liner portion of the air purifying filter of the present invention, or can be provided so as to be contained in a member, and is constituted by the flute portion and the liner portion. When air convections through the space, it comes into contact with a photocatalyst, a deodorant or an adsorbent, and is preferably cleaned.

The method of providing a photocatalyst, a deodorant or an adsorbent according to the present invention may be carried on a flute portion and a liner portion, may be internally added at the time of forming a sheet-like material, or may be provided on a flute portion and a liner portion. It may be used as a partial structural material of the part. The photocatalyst used in the present invention is a photoreactive semiconductor capable of removing photoreactive harmful substances, and fine titanium oxide particles, zinc oxide particles, tungsten oxide particles, cerium oxide particles and the like can be used. It is preferable to use titanium oxide from the viewpoints of stability in water, toxicity and the like. Titanium oxide is coated with fine metal particles such as platinum, gold, palladium, silver, copper, zinc, and rhodium to further enhance its photocatalytic action, or is oxidized to impart more oxidizing properties due to holes. A coating treatment with a metal oxide such as ruthenium may be performed.

Examples of the adsorbent in the present invention include activated clay, zeolite, sepiolite, halloysite, zinc oxide, porous silica, alumina, magnesium oxide, calcium oxide, activated carbon, and composites thereof. Activated carbon fibers are preferred. In the case of activated carbon fibers, they can also be used as a structural material for a flute portion or a liner portion.

If the flute portion or the liner portion is electretized, the suspended fine particles that pass through the hole are preferably adsorbed to the electretized flute portion or liner portion in the convection process even if they pass through the hole. Fine particles much smaller than the opening diameter can be adsorbed and removed. In particular, it is more preferable that the flute portion or the liner portion be an electret nonwoven fabric.

The electret according to the present invention is one that retains electric polarization semipermanently and applies electric force to the outside, and captures particles by the electrostatic force. Examples of the charging method include an electro-electret, a heat electret, a radio-electret, a mechano-electret, a photo-electret, and a magnet-electret. As a filter material, a copolymer mainly composed of polyethylene terephthalate, polypropylene or propylene is often used. In addition, the film subjected to the charging treatment by corona discharge or the like was cut into a fibrous form, and the fiber was electrified as a heat electret by applying a high voltage during the melt fiber spinning and the melt fiber spinning, or the split fiber electret which was formed into a nonwoven fabric. Melt blown nonwoven fabric electrets, spunbonded nonwoven fabric electrets, and the like can obtain a stable polarization charge. In addition, since the melt blown nonwoven fabric type electret alone has low mechanical strength, a dry nonwoven fabric or a spun bond may be used in some cases.

The liner portion and the flute portion used in the present invention are preferably planar materials having a certain degree of rigidity. Synthetic paper, cloth, nonwoven fabric, wood, plywood, film, glass, steel plate, aluminum plate, tin plate And the like can be used, but it is better to use these materials depending on the application.
When used as an electret, it is preferably used as a nonwoven fabric.

The non-woven fabric is made of polyamide fiber, polyester fiber, polyalkylene paraoxybenzoate fiber, polyurethane fiber, polyvinyl alcohol fiber, polyvinylidene chloride fiber, polyvinyl chloride fiber, polyacrylonitrile fiber, polyolefin fiber. , Synthetic fibers such as phenolic fibers, inorganic fibers such as glass fibers, metal fibers, alumina fibers, activated carbon fibers,
Wood pulp, hemp pulp, natural fibers such as cotton linter pulp, regenerated fibers, or hydrophilic to these fibers,
It is manufactured by various methods using fibers and the like imparted with functions such as flame retardancy, deodorization, adsorption and antibacterial properties.

There are no particular restrictions on the method for producing the nonwoven fabric, and the web obtained by a dry method, a wet papermaking method, a melt blown method, a spunbond method or the like may be subjected to a hydroentanglement method, a needle punch method, a stitch method, depending on the purpose and application. It can be produced by appropriately combining a physical method such as a bonding method, a bonding method using heat such as a thermal bonding method, and a bonding method using an adhesive such as a resin bond to develop strength.

The air purifying filter according to the present invention may carry other fragrances, antibacterial agents, insect repellents, insect repellents, etc. in combination by spray coating or the like.

In the method of laminating the flute portion and the liner portion in the present invention, heat fusing may be performed, or laminating may be performed using an adhesive. The same applies to the joining with the housing. The flute portion in the present invention may be formed by embossing, bending, or the like. Any of a triangular shape, a rectangular trapezoidal shape, and a waveform may be used, but a waveform that easily forms a narrow space is preferable.

[0029]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto unless it departs from the gist thereof.

Example 1 (1) Preparation of Coating Liquid for Coating 100 parts by mass of commercially available colloidal silica ("Cataloid SA", 30% by weight, manufactured by Catalyst Chemical Industry Co., Ltd.) and a commercially available thermoplastic polymer emulsion (manufactured by Toyobo Co., Ltd.) "Vylonal MD-1
930 ”40 wt%) 200 parts by mass and titanium oxide 50
200 parts by weight of the wt% dispersion was mixed to prepare a coating liquid (1) for coating.

(2) Preparation of Liner Member Using a polyester film having a thickness of 200 μm as a support, both surfaces of this film are subjected to corona discharge treatment, and coated so that the coating amount after drying is 10 g / m ^{2 on} one side. A photoreactive harmful substance removing layer is formed on both sides by spray coating with a coating liquid (1) for use to prepare a support having a photoreactive harmful substance removal function, and a hole having an opening diameter of 1 mm is formed on the support. A liner member was formed by piercing randomly so as to be 60%.

(3) Preparation of flute member 30 parts by weight of 1d polyester fiber, 30 parts by weight of polyethylene fiber, and 40 parts by weight of hardwood were made into a slurry, wet paper-made, and had a bulk density of 0.5 g / cm ³ and a thickness of 500 μm. Was obtained. The coating liquid for coating (1) is applied on both sides so that the coating amount after drying is 20 g / m ^{2 on} one side, and holes having an opening diameter of 1 mm are randomly perforated so that the opening area becomes 50%. Further, a flute member was formed by heating and pressing so as to form a corrugated shape having a cycle of 20 mm and an amplitude of 7 mm.

(4) Assembling of the air cleaning filter Twenty sets of the liner member and the flute member are alternately laminated so that the tangent lines at which the flute portion and the liner portion contact each other are parallel to each other. Gluing is performed so that the liner section is parallel to the direction of air inflow and outflow, and the cylindrical space formed by the flute section and the liner section is at right angles. An air purifying filter (FIG. 2) was obtained by arranging three space-like spaces. In addition, a detachable housing was provided at the cylindrical opening formed by the flute portion and the liner portion, and the opening was closed. Further, ultraviolet light is irradiated from the liner surface side and the outflow side of the air.

Example 2 (1) Preparation of Liner Member A quartz glass plate having a thickness of 5 mm and a size of 100 × 100 mm was selected as a support, and a hole having a diameter of 2 mm was formed so as to have an aperture ratio of 60%. The coating liquid for application of Example 1 was sprayed onto both sides so that the coating amount after drying was 50 g / m ^{2 on} one side so that the holes were not blocked, and a photoreactive harmful substance removing layer was formed. A liner member having a reactive harmful substance removing function was prepared.

(2) Preparation of Flute Member A quartz glass plate having a thickness of 5 mm was selected as a support, and the diameter was 2 mm.
mm holes so that the opening area ratio is 60%,
In a heated and softened state, a corrugation having a cycle of 40 mm and an amplitude of 10 mm was stamped to produce a glass corrugated plate having a projection surface of 100 × 100 mm. A flute member having a function of removing photoreactive harmful substances by spraying and applying a coating liquid for application to both sides of the support so as to have a solid content of 50 g / m ² on one side to form a photoreactive harmful substance removal layer. It was created.

(3) Assembling of the air cleaning filter Three sets of the above-mentioned liner member and the flute member are alternately laminated so that the tangent line at which the flute portion contacts the liner portion is parallel between the flute members. Another liner member is provided on the part, the tangents of both are glued, the surface of the liner part is perpendicular to the direction of air inflow and outflow, and a cylindrical shape composed of a flute part and a liner part Was made to be a right angle, and an air purification filter was obtained.
Further, the side surface on which air does not flow in and out was covered with a housing, and a detachable housing was provided at the cylindrical opening formed by the flute portion and the liner portion to close the opening. The casing was made of an elastic plate in which low-density polyethylene was laminated on both sides of urethane rubber. This air purifying filter integrated with the housing can be detachably fitted into a part of the window glass.

Example 3 (1) Preparation of Liner Member Activated carbon having an average particle size of 10 μm was dispersed in a slurry comprising 80 parts by mass of hardwood kraft pulp, 10 parts by mass of polyvinyl alcohol fiber, and 10 parts by mass of activated carbon fiber. Thus, a wet nonwoven fabric having a thickness of 200 μm and an internal mass of 200% by mass was obtained. A hole with an opening diameter of 1 mm is formed in this nonwoven fabric with an opening area of 50%.
A liner member was created by punching randomly so that

(2) Preparation of flute member 10 parts by mass of activated carbon fiber, heat-fused polyethylene fiber 20
Activated carbon having an average particle size of 5 μm is dispersed in a slurry consisting of 10 parts by mass, 10 parts by mass of polyvinyl alcohol fiber, and 40 parts by mass of hardwood, and wet-papermaking is performed. A wet nonwoven fabric of 5 g / cm ³ was obtained. Holes having an opening diameter of 1 mm were randomly drilled so that the opening area became 50%.
5 g / m ² of solid carbon on one side was dried and dried.
A corrugation having a cycle of 20 mm and an amplitude of 7 mm was subjected to a heating embossing process to prepare a 300 μm thick flute member.

(3) Assembling of the air cleaning filter Seven sets of the liner member and the flute member are laminated so that the flute members are parallel to each other, and the tangents of the two members are glued, and the direction of the horizontal flow of air is determined. And the groove of the liner portion is set to be perpendicular to the horizontal line (FIG. 3). An air purifying filter (FIG. 4) was obtained in which the opening was closed so as to be covered by a casing, and one of the casings in the cylindrical opening could be removed.

Example 4 (1) Preparation of Liner Member Activated carbon having an average particle size of 7 μm was coated on both surfaces of the wet nonwoven fabric of Example 3 at a solid content of 5 g / m ^{2 and} dried, and a hole having an opening diameter of 1 mm was formed. Was randomly punched so as to be 50% to prepare a liner member. (2) Preparation of flute member Bulk density consisting of 100% of 1d polyester 0.4 g /
cm ^3, to obtain a wet-laid nonwoven fabric having a thickness of 300 [mu] m, press-heating treatment to, to form 1 cycle 20 mm, the corrugated amplitude 7 mm. During heating, an electric field was applied to generate an electret. Further, a hole of 2 mm was perforated so as to have an opening ratio of 50% to prepare a flute member. (3) Assembly of Air Purification Filter An air purification filter was obtained in the same manner as in Example 3.

Comparative Example 1 Regarding the air purifying filter of Example 3, the flute member and the liner member were not provided with holes, and the grooves of the flute portion were formed so that the liner surface was parallel to the direction of air inflow and outflow. An air purifying filter as shown in FIG. 6 was obtained so as to be parallel.

Comparative Example 2 Using the member of Example 3, the flute portion and the liner portion were wound as shown in FIG. 7, and the groove of the flute portion was made parallel to the direction in which air flows in and out to obtain an air purifying filter. Was.

Comparative Example 3 (2) Preparation of Flute Member 10 parts by mass of activated carbon fiber, polyethylene heat-sealed fiber 20
Activated carbon having an average particle size of 5 μm is dispersed in a slurry consisting of 10 parts by mass of polyvinyl alcohol fiber, 10 parts by mass of polyester fiber, and 30 parts by mass of hardwood, and wet-paper-making is performed, and a thickness obtained by internally adding 10% by mass of activated carbon is used. A wet nonwoven fabric having a thickness of 500 μm and a bulk density of 0.5 g / cm ³ was obtained. Further, 5 g / m ² of activated carbon having an average particle size of 7 μm was applied to both surfaces at a solid content, dried, and embossed in a bowl shape having a diameter of 10 mm and a height of 7 mm so as to form a gap between the nonwoven fabrics. Laminated so that the parts are partially fitted with each other, an outflow / inlet of air is provided in a direction parallel to the laminated nonwoven fabric,
An air purifying filter through which air flows into and out of the gap between the nonwoven fabrics was prepared (see FIG. 8). The embossing is performed so that the incoming air hits one of the embosses.

Test for confirming the effect of the air purifying filter having the structure of the present invention.
The effects of the present invention were confirmed by the following evaluations. <Evaluation Items> Response to Increase / Decrease in Air Flow Confirmation of Removal of Fine Particles in Air Inorganic fine particles having an average particle diameter of 20 μm and a specific gravity of 2.5 were mixed with air, and the state of removal of the fine particles was observed. Long-term use by trapping and regenerating fine particles Confirmation of photocatalytic effect Acetaldehyde was adjusted to a concentration of 10 ppm, and this was flowed at a rate of 2 L / cm ³ per minute to the volume of the filter, and the concentration of acetaldehyde in the air at the outlet was measured. Was measured. Confirmation of removal of methyl mercaptan Methyl mercaptan was adjusted to 10 ppm, and the removal effect was measured by a sensory test.

Evaluation Results The air-cleaning filter of Example 1 did not break down due to air pressure even if the flow of air suddenly increased from the air stagnation state. I was trapped in a small space. Also, the concentration of aldehyde could be removed by 50% or more. The smell of methyl mercaptan was also reduced. When the air purifying filter of Example 2 is used by being attached to a part of a window glass,
The air could be naturally ventilated according to the air flow. In addition, it can trap dust contained in the outside air,
The trapped dust could be removed by opening part of the enclosure. Further, fresh air in which the smell of methyl mercaptan in the outside air was decomposed by sunlight was taken in. The air purifying filter of the third embodiment does not break even if the air flow further increases or decreases as compared with the air purifying filter of the first embodiment, and is stable in the air even when the flow rate changes. It was confirmed that the fine particles were removed. In particular, the fine particles trapped in the narrow space between the flute portion and the liner portion of the filter were held by the unevenness of the nonwoven fabric, and were rarely separated. In addition, acetaldehyde and methyl mercaptan odor could be removed by the effect of activated carbon. Example 4
The air purifying filter of Example 3 was able to obtain the same effect as in Example 3, and was also able to adsorb extremely small soot-like foreign matters such as carbon mist that cause soiling of air. In the air cleaning filters of Comparative Examples 1 and 2, the change in pressure loss was small with respect to the change in the amount of air, but the effect of removing acetaldehyde and methyl mercaptan odor was less than that in Example 3 where the effect was recognized. This is because there is little air contact because the air flows rectified through the cylindrical shape formed by the flute portion and the liner portion. Fine particles such as dust could hardly be trapped. The air purifying filter of Comparative Example 3 had a more deodorizing effect than Comparative Examples 1 and 2 because the air hit the bowl-shaped projection. However, it was not as good as in Example 3. Fine particles such as dust could hardly be trapped.

[0046]

As described above, the air purifying filter of the present invention does not increase the pressure loss even if the flow rate of air sharply increases or decreases, does not damage the filter due to the increased air pressure, and does not cause clogging due to fine particles. Fine particles can be removed over a long period of time, trapped fine particles can be removed from a filter and regenerated, and the device can be used stably for a long period of time. Further, harmful substances such as dust, malodorous substances and environmental pollutants other than fine particles can be adsorbed or decomposed and removed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a laminated body in which flute portions and liner portions are alternately laminated such that grooves of the flute portions are parallel.

FIG. 2 is a diagram showing a plurality of small holes formed in at least one of a flute portion and a liner portion, and a flute portion and a liner portion are alternately laminated so that grooves of the flute portion are parallel to each other; And a perspective view of the air purifying filter provided with an air outflow / inlet port in a direction perpendicular to a tangent line at which the flute section and the liner section come into contact with each other.

FIG. 3 shows a plurality of small holes formed in the liner portion and the flute portion, and the flute portion and the liner portion are alternately laminated so that the grooves of the flute portion are parallel to each other, and an outflow / inflow port of air perpendicular to the liner surface. The perspective view of the air purifying filter characterized by being provided.

FIG. 4 is a perspective view of an air purification filter having a structure in which a side surface other than an air outflow / inflow port is sealed with a housing and a housing portion of a cylindrical opening formed by a flute portion and a liner portion is detachable.

FIG. 5 is a diagram in which a flute portion and a liner portion are laminated, an air flow blown out from a hole 3 is represented by a curved arrow line, a sheet-like flute portion and a liner portion are represented in a linear shape, and air flows out. FIG. 2 is a side sectional view of an air purifying filter having inlets on left and right.

FIG. 6: The flute portion and the liner portion are alternately stacked so that the grooves of the flute portion are parallel to each other, in a direction parallel to the liner surface and also in a direction parallel to a tangent line at which the flute portion and the liner portion contact. FIG. 2 is a perspective view of an air purifying filter outside the present invention provided with an air outflow / inlet port.

FIG. 7 Wounds a laminate in which a pair of band-shaped flute portions and a liner are stacked, and discharges air in a direction parallel to the liner surface and also in a direction parallel to a tangent line where the flute portion and the liner portion are in contact with each other. FIG. 3 is a perspective view of an uninvented air purifying filter provided with an inlet.

FIG. 8 is a perspective view of a bowl-shaped embossed sheet-like material (A), a side view (B) of a state where the embossed portion is laminated so as to be partially fitted, and parallel to the sheet-like material. The side view (C) of the air purifying filter outside invention which is provided with the air outflow / inlet in the direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Flute part 2 Liner part 3 Hole 4 Housing 5 Removable housing part of cylindrical opening formed by flute part and liner part a At right angles to liner surface and at tangent line where flute and liner come into contact Surface to cut parallel to

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C080 AA05 BB02 CC01 CC05 HH05 JJ04 KK08 LL02 MM03 MM04 MM05 MM06 NN05 4D054 AA11 BC16 EA27 4D058 JA12 JA13 JA33 JA34 JB25 JB39 KA01 KA15 PA14 QA05 TA02 TA06

Claims (8)

[Claims] 1. An air purifying filter in which a flute portion and a liner portion are alternately laminated, a plurality of small holes are formed in at least one of the flute portion and the liner portion, and a plurality of small holes are formed in a direction parallel to the liner surface. An air purifying filter, wherein an air outflow / inlet port is provided in a direction perpendicular to a tangent line at which the section and the liner section come into contact with each other. 2. An air purifying filter in which a flute portion and a liner portion are alternately stacked, a plurality of small holes are formed in the liner portion and the flute portion, and an air outflow / inlet port is provided in a direction perpendicular to the liner surface. An air purifying filter, characterized in that: 3. The air purifying filter according to claim 2, wherein the tangents at which the flute portion and the liner portion contact each other are stacked so as to be parallel, and the tangents are used horizontally or inclined. 4. The flute portion and the liner portion are laminated so that a tangent line at which the flute portion and the liner portion contact each other is not parallel between the flutes.
An air purifying filter as described. 5. A side surface other than an air outflow / inlet port is sealed by a housing, and a housing portion of a cylindrical opening formed by a flute portion and a liner portion can be detached. 5. The air purifying filter according to 3 or 4. 6. A photocatalyst, a deodorant, or an adsorbent is carried or provided on at least one of a flute portion and a liner portion. An air purifying filter as described. 7. The air purifying filter according to claim 1, wherein at least one of the flute portion and the liner portion is electretized. 8. The air purifying filter according to claim 1, wherein the flute portion or the liner portion is a nonwoven fabric.