JP2002102625A - Honeycomb filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honeycomb filter excellent in functionality and dust collection prosperities, having a pressure loss and excellent collection efficiency. SOLUTION: The honeycomb filter comprises a sheet having open gasp consisting of a large number of pleated ridge and trough parts formed thereto, formed using perforated films. The honeycomb filter comprises a nonwoven fabric formed on perforated fibers and the sheet having open gasp consisting of a large number of pleated ridge and trough parts formed thereto. The filter is preferably formed by laminating a flat second sheet to the sheet (first second) so as to form a honeycomb structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb filter, and more particularly, to a filter having excellent dust collecting property and low pressure loss.
The present invention relates to a honeycomb filter which has a high collection efficiency and can impart functionality such as deodorization.

[0002]

2. Description of the Related Art As an air filter used for an air conditioner, an air purifier, an automobile, etc., for example, an electret non-woven fabric is formed into a pleated shape, and an air current is passed through the pleated shape.
There is known a device that adsorbs and removes fine particles such as dust and dust in the air by static electricity. In general, a special activated carbon layer is provided for removing odors and the like. As a method for producing an electret nonwoven fabric, for example, a method of forming a nonwoven fabric by a melt blow method using a polyolefin such as polypropylene and applying a high DC voltage to the obtained nonwoven fabric is disclosed in Japanese Patent Application Laid-Open No. Sho 6
No. 0-168511, JP-A-2-197110, and the like. In addition, Japanese Patent Publication No. 56-47299
The publication discloses a technique used as a filter.

[0003] However, the filter using the electretized nonwoven fabric having the above-described structure has a problem in that the pressure loss is limited, and there is a problem that the collection life of the fine particles is short because the fine particles are easily clogged. In order to solve such a problem, a filter in which the above-mentioned electret nonwoven fabric is formed into a honeycomb shape has been proposed (Japanese Patent Publication No. 51-52323, etc.). Honeycomb filter A
In general, as shown in the perspective view (a) of FIG. 1 and the partial cross-sectional view of the element (b), a flat sheet 2 ′ has a plurality of peaks 3 ′ and valleys 4 ′ continuously. 'Are stacked in multiple stages.

[0004] Such a honeycomb filter has a low pressure loss and contributes to energy saving by reducing the power consumption of home electric appliances, especially air conditioners, and also improves the collection performance by using electretized nonwoven fabric. . However, all of the functions such as low pressure loss, high trapping performance, long life, and deodorization cannot be satisfied, and there is no known filter that satisfies these requirements.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a honeycomb filter having excellent functionality and dust collecting property, low pressure loss, and excellent collection efficiency.

[0006]

In order to solve the above-mentioned problems, in the present invention, there is provided a honeycomb filter comprising a sheet formed of a perforated film and having a continuous void formed by a large number of fold-shaped peaks and valleys. Is provided.

Further, there is provided a honeycomb filter formed of a nonwoven fabric formed of perforated fibers and formed of a sheet in which continuous voids are formed in a plurality of fold-shaped peaks and valleys. It is a preferred embodiment of the present invention that the perforated fiber is a defibrated yarn obtained by defibrating a perforated film.

[0008] In the honeycomb filter of the present invention,
It is preferable that the first sheet has a honeycomb shape in which a flat second sheet is laminated on the first sheet. Further, it is preferable that the second sheet is a nonwoven fabric made of the perforated film or perforated fiber.

In a preferred aspect of the honeycomb filter according to the present invention, the first sheet and the second sheet are alternately laminated, and a contact portion between a peak or a valley of the first sheet and the second sheet is fused. Alternatively, it is desirable that they are bonded.

[0010] In the honeycomb filter of the present invention, it is preferable that the sheet is electretized because the filter performance can be enhanced.

[0011] In a preferred embodiment of the honeycomb filter of the present invention, the surface area of the perforated film or perforated fiber is desirably 20 cm ² / g or more.

Further, in the honeycomb filter of the present invention, the perforated film or perforated fiber contains at least one agent selected from a deodorant, an antibacterial agent, an antiviral agent, a gas adsorbent, activated carbon and a photocatalyst. It is particularly preferable to have the various functions together.

Further, it is a preferred embodiment of the present invention that the perforated film is a film obtained by subjecting a film formed using a resin containing a filler to a stretching treatment.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the honeycomb filter of the present invention will be described in detail. The honeycomb filter of the present invention is a perforated film (which may be electretized), and is composed of a sheet (first sheet) in which a continuous void is formed by a large number of fold-shaped peaks and valleys. . The honeycomb-like structure preferably has a flat second surface with the first sheet.
It is formed by laminating sheets.

The perforated film is a resin film in which countless fine holes (either through holes or holes that do not penetrate) are formed. The resin is preferably made of a thermoplastic resin because molding and processing are easy, and polyolefin, polyester, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, and modified products thereof (halogen atom, carbonyl group, carboxyl group, etc.) are preferable. Groups having a nitro group or a nitro group in a polymer molecule) and a thermoplastic resin comprising a mixture thereof. Among them, a non-polar polyolefin-based polymer or a polyolefin composition containing the polyolefin-based polymer as a main component is easily electretized, which is described later, and is excellent in persistence of its charge and collection performance. preferable. The polyolefin composition may contain a small amount of a polyolefin polymer having a polar group.

Examples of the polyolefin polymer having a polar group include: (A) a copolymer of a monomer having a polar group and an α-olefin, for example, pentabromophenyl methacrylate;
Copolymer of 4,6-tribromophenyl methacrylate or the like with α-olefin such as ethylene or propylene; (B) Modification by introducing a polar group into side chain or main chain of polyolefin by oxidation or halogenation A polyolefin, for example, polyethylene or polypropylene, which is oxidized or chlorinated to introduce a carbonyl group, a nitro group, or a chlorine atom in the molecule; (C) a polyolefin or a polymer of the above (B), A modified polyolefin obtained by graft copolymerization of a monomer having a group, for example, a polymer alone such as a modified polyolefin modified with a modified monomer such as an unsaturated carboxylic acid or a derivative thereof, or a mixture thereof is exemplified.

Here, the polyolefin-based polymer or the polyolefin as a base polymer of the modified polyolefin is a homopolymer of α-olefin, a copolymer of two or more α-olefins, or a copolymer selected from these. A mixture of more than one species. As the α-olefin, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, isopentene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-
Hexadecene, 1-octadecene, 1-eicosene and the like can be mentioned.

Specific examples of the polyolefin include polyethylene, polypropylene, poly 1-butene, poly 4-methyl-1-pentene, ethylene / propylene copolymer, ethylene / 1-butene copolymer, ethylene / 4-methyl- Examples thereof include 1-pentene copolymer, propylene / 1-butene copolymer, and 4-methyl-1-pentene / 1-decene copolymer. Among them, polypropylene, poly 1-butene, poly 4-methyl, which are high in strength, easy to adjust to an appropriate melt viscosity, and easy to mold by melt blow method.
1-Pentene is preferred, and polypropylene is particularly preferred because it is inexpensive and easy to mold, and is easily electretized.

When a polyolefin composition containing an unmodified polyolefin and a modified polyolefin is used as a main material of the perforated film, the content ratio of the modified polyolefin / unmodified polyolefin in the polyolefin composition is usually 0.1% by weight. 1 / 99.9-20 / 80
And preferably about 1/99 to 5/95. In addition, the polyolefin composition, in addition to the modified polyolefin and the unmodified polyolefin, various additives, such as an antioxidant, an ultraviolet absorber, a pigment, a dye, a nucleating agent, and a filler within a range that does not impair the purpose of the present invention. Agents, slip agents, anti-blocking agents, lubricants, flame retardants, plasticizers and the like.

The perforated film is a film in which a myriad of fine holes are perforated. The method for producing the film is not only a method using a needle hole processing method, but also a physical method such as a perforation method using laser or plasma. , A method of adding a filler and performing a stretching treatment, a method of adding a plasticizer to form a film, and extracting the film, and a method of using a foaming agent.

In the method of stretching by adding a filler, for example, a resin composition to which an inorganic filler or an organic filler is added as a filler is used. In specific examples of the filler, as the inorganic filler, oxides and hydroxides of alkaline earth metals,
Carbonates, sulfates and silicates; examples include oxides, hydroxides, carbonates, sulfates and silicates of Group III elements of the Periodic Table, and organic fillers such as wood flour and pulp. Cellulose powder; crosslinked product powder such as silicone and phenol. Among these, inorganic fillers,
In particular, a porous inorganic filler is preferable from the viewpoint of improving the adhesiveness of the film. Instead of the filler, a functional powder such as a deodorant, an antibacterial agent, a gas adsorbent, a photocatalyst, or activated carbon, which will be described later, can also be used.

The particle size of the filler is usually 0.1 to 10
It is about μm, preferably about 0.5 to 5 μm. The content weight ratio of the resin to the filler in the resin composition (resin / filler) is usually 30/70 to 80/20.

The resin composition to which the filler is added is formed into a film by a known method such as an inflation molding method or a T-die extrusion molding. Next, a stretching treatment is performed to obtain a perforated film. The stretching treatment may be uniaxial stretching or biaxial stretching. At this time, the stretching temperature is adjusted in a temperature range from room temperature to below the melting point of the resin, and the stretching is performed at a stretching ratio of 1.2 to 8 times, preferably 2 to 6 times. Thereby, the porosity is 50%.
As described above, a perforated film having an air permeability of 300 sec or more can be obtained.

In the method of extracting after forming a film by adding a plasticizer, first, the resin composition to which the plasticizer is added
It is formed into a film by a known method such as die extrusion.
The resin used here is preferably a polyolefin-based polymer, and more preferably polypropylene or polyethylene.

The plasticizer to be added has a molecular weight of 200
A hydrocarbon plasticizer that is solid at room temperature of 0 or less is preferable,
Specific examples include lower n-alkanes such as docosan, trichosane, tetracosane, and triacontan, paraffin wax, and polyethylene wax. The content weight ratio of the resin to the plasticizer (resin / plasticizer) in the resin composition is usually 20/80 to 75/25.

The formed film is immersed in a solvent capable of extracting and removing the plasticizer, for example, a hydrocarbon solvent such as n-hexane, cyclohexane, or n-butane, and the plasticizer is extracted at a heating temperature of 90 ° C. or lower. Removed. After drying, the film is stretched to obtain a perforated film. In the stretching process,
When the stretching temperature is, for example, 60 ° C. or more and less than 135 ° C., uniaxial stretching or biaxial stretching, preferably biaxial stretching,
The film is stretched at a magnification of at least 3 times and at least 3 times the width. Thereby, a porous film having a surface area of 70 m ² / g or more, a porosity of 35% or more, and an air permeability of 500 sec or more can be obtained. The extraction of the plasticizer may be performed after the stretching treatment.

A similar perforated film can be obtained by a similar method in which the combination of the plasticizer and the extraction solvent is changed. For example, when water (including an acidic or alkaline aqueous solution) or hot water is used as the extraction solvent, a water-soluble powder whose melting point or decomposition temperature is higher than the melting point of the film material, specifically, sodium chloride, chloride, Powders such as barium, sodium carbonate, polyvinyl alcohol and the like can be used in place of the plasticizer. When alcohol is used as the extraction solvent, an alcohol-soluble powder having a melting point or a decomposition temperature higher than the melting point of the film material can be used instead of the plasticizer.

Further, when a removal method using an air stream or vibration is used in place of the removal using the extraction solvent, various kinds of powders that are not compatible with the material in the film forming can be used without limitation in place of the plasticizer. Can be used. Specific examples include calcium carbonate, metal powder, and mixtures thereof. These powders are added to a resin to form a film, and a perforated film is obtained in the same manner as in the above-described method of adding a filler and performing a stretching treatment. Aspirate and remove. At this time, it is effective to vibrate the film with a sound wave, an air wave, or a vibration machine. It is preferable that the porous film thus obtained also has the same surface area, porosity, and air permeability as described above.

In the method using a foaming agent, a foam can be easily molded by adding a foaming agent to a resin and keeping the resin under foam molding temperature conditions. As the foaming agent, depending on the molding method and molding temperature of the resin foam, sodium bicarbonate, sodium carbonate, azide compound, azodicarbonamide, p-toluenesulfonyl semicarbazide, decomposable foaming agent such as trihydrazinotriazine, and It is appropriately selected from evaporating foaming agents such as aliphatic hydrocarbons, chlorinated aliphatic hydrocarbons, and inert gases. The perforated film used in the present invention needs to be at least a hole having an opening on the surface, and the foam is in a state of closed cells on the film surface and does not have an opening on the surface. In this case, a hole having an opening can be formed by physically roughening or shaving both surfaces of the film. In this case, the expansion ratio of the film is usually 2 to 100 times.

A perforated film having holes and slits which are physically drilled is a film having an innumerable number of minute holes, cuts, or slit-shaped openings with narrow gaps. Examples include a processing method and a needle hole processing method, and a physical method such as a perforation method using laser or plasma. As an example of the laser drilling method, there is a hole drilling using a carbon dioxide laser, and the diameter is 1 mm.
Processing up to 50 μm is possible.

Among these methods for producing a perforated film,
A method of performing a stretching treatment by adding a filler is preferable. The porous film thus obtained has a porosity of 5% or more, preferably 10% or more, more preferably 20 to 80%, and a surface area (measured by a mercury intrusion porosimeter) of 20 cm ² / g or more. , Preferably 0.0022 to 100
m ² / g, more preferably 0.0025~80m ² / g,
The average pore diameter is about 5 μm, and the thickness is usually 10 to 200 μm.
It is.

The perforated film of the present invention is more preferably an electretized film. The electretization treatment can be performed by applying a DC voltage to the film. The value of the applied DC voltage is appropriately selected according to the shape of the electrodes to be used, the distance between the electrodes, etc., the amount of charged charges required for the electretization filter, the processing speed, and the like.
For example, when the distance between the electrodes is 8 mm, at least -5 k
V, preferably -6 to -30 kV, applied to the film.

The method for applying the DC voltage may be any known method, and is not particularly limited. For example,
A method in which a film is passed between a pair of electrodes to which a DC voltage is applied; a method in which a corona discharge or a pulse-like high voltage is applied to the surface of the film; A method such as a method of applying a voltage can be used.

The electretization of the film may be performed at the time of molding or after the molding. In particular, it is preferable to perform an electretization process on a perforated film having a myriad of fine holes, since the surface charge density increases with an increase in the surface area of the film.

The average surface charge density of the electret film, in that it can exhibit sufficient dust collecting performance as an electret is usually, 1 × 10 ^-11 coulombs / cm ² or more, preferably 5 × 10 ^{- 10} coulombs / cm ² or more.

The honeycomb filter of the present invention further comprises:
It is a nonwoven fabric (which may be electretized) made of perforated fibers, and is a sheet (first sheet) in which a continuous void is formed by a large number of fold-like peaks and valleys. The honeycomb-like structure preferably has a flat second surface with the first sheet.
It is formed by laminating sheets.

The perforated fiber is a fiber made of a resin filament having a number of fine holes (both may be through holes or holes that do not penetrate). The resin is preferably made of a thermoplastic resin in that molding and processing are easy, and the same resin as exemplified in the above-described perforated film can be used.

The perforated fiber is preferably a defibrated yarn obtained by defibrating the perforated film. Fibrillation processing, after slitting the perforated film, and then stretching,
Alternatively, the stretching is performed by slitting after stretching to prepare a stretched tape and fibrillating the tape. Next, a web is formed by a dry or wet method, and entangled to obtain a nonwoven fabric. The basis weight of the nonwoven fabric is usually 5-200
g / m ^2, preferably from 20 to 100 g / m ^2.

The nonwoven fabric made of perforated fibers used in the present invention is more preferably an electretized one.
The electretization treatment can be performed in the same manner as in the case of the above-mentioned perforated film.

In the present invention, the perforated film or perforated fiber forming the filter material is at least one functional agent selected from a deodorant, an antibacterial agent, an antiviral agent, a gas adsorbent, activated carbon and a photocatalyst. Is preferable. Examples of the functional agent include activated carbon, charcoal, bamboo charcoal, Otani stone powder, and zeolite having deodorizing and various gas adsorption functions; silver zeolite, copper zeolite, which also has an antibacterial action against various bacteria such as Escherichia coli, MRSA, and Staphylococcus aureus; Titanium oxide (photocatalyst), zinc oxide; various phenols such as catechin and apple polyphenol that have antibacterial and antiviral activity; silica gel, sodium chloride, charcoal, and bamboo charcoal with dehumidifying function; tourmaline and distant / near with negative ion generating function Ceramics having a function of generating infrared rays can be used.

When these agents are powders, they are kneaded into the materials used for the production of perforated films and perforated fibers, or dissolved or dispersed in a solvent, and are applied to the surface of perforated films and perforated fibers. It can be contained by a method such as coating. Among these agents, those formed into a fibrous material can be contained as perforated fibers as they are, or mixed with perforated fibers and used as a nonwoven fabric.

Among the above-mentioned chemicals, those which can be used as a filler for producing the above-mentioned perforated film include:
The stretching in the manufacturing process is particularly preferable because the drug kneaded in the resin is easily exposed on the surface.

A film obtained by solidifying a functional fiber, for example, an activated carbon fiber, an antibacterial fiber (copper, silver, etc.), a fibrous material composed of surface-coated fiber or mixed fiber, or a functional powder with a binder is used as described above. It can also be used as a perforated film.

Hereinafter, a production example of the honeycomb filter of the present invention will be specifically described. As shown in FIG. 2A, a sheet made of a nonwoven fabric (which may be electret) made of a perforated film or a perforated fiber is continuously bent, and a large number of peaks 3 and valleys 4 are continuously formed. The first sheet 1 having the above is manufactured. Next, the first sheet 1 is
Superimposed on a flat second sheet 2, the valleys 4 of the bottom 4 ₁ second fused or bonded to the surface of the sheet 2, as shown in FIG. 2 (b), to produce a unit 5. Then, after predetermined number making such unit 5, as shown in FIG. 2 (c), the first unit 5 ₁ and a second unit 5 ₂ stacked, the first unit 5 ₁ a mountain portion 3 of the top portion 3 _1, the second unit 5 ₂ fusion or adhering to the lower surface, further, similarly to the third unit 5 ₃ laminated on the second unit 5 _2, the second unit 5 a top portion of the _second ridge portions, fused or adhered to a lower surface of the third unit _3.

By repeating this laminating and fusing or bonding step, a structure having honeycomb-shaped voids 6 is formed.
Here, the first sheet 1 and the second sheet 2 may be the same film or different films, but are preferably a perforated film or a nonwoven fabric made of perforated fibers.

The honeycomb filter of the present invention has a honeycomb height h (shown in FIG. 1) of usually 10 mm or less, preferably 0.1 to 5 mm, more preferably 0.2 to 3 m.
m, and the width w of the honeycomb (shown in FIG. 1) is usually 10 mm or less, preferably 0.2 to 5 mm, and more preferably 0.1 mm or less.
5 to 3 mm. In particular, by using a perforated film, especially an electret perforated film, the height h and width w of the honeycomb can be significantly reduced as compared with those using a conventional nonwoven fabric, so that the collection efficiency is dramatically improved. Can be done.

The honeycomb-shaped air filter of the present invention has excellent dust collecting properties, low pressure loss, high collection efficiency, and can easily contain a functional agent in the filter material. Rich in functionality. It operates household air purifiers and air conditioner air purifier filters that use low-power fans, exhaust cleaner exhaust filters, air purifier filters for large facilities such as hospitals and buildings, and operates bioindustries and precision electronic devices. Clean filters for production equipment and rooms; filters for air purification of automobiles, buses, airplanes, etc. Filters containing functional agents in filter media include air conditioning filters for food storage warehouses, rooms, refrigerators, etc. Air-conditioning filters for buildings and rooms for animal breeding; gas adsorption filters for exhaust gas from factories, laboratories, equipment, etc .; adsorption filters for formalin odor peculiar to museums, museums, newly built rooms, etc .; It is preferably used for a filter such as a filter for adsorbing trace amounts of gas in intake air.

[0048]

Industrial Applicability The honeycomb filter of the present invention has excellent dust collecting properties, low pressure loss, high collection efficiency, and can be preferably used for various air cleaning filters. Further, a filter material containing a functional agent in a filter material is excellent in deodorization and other functions and can be suitably applied to an air-conditioning filter, a gas adsorption filter and the like.

[0049]

EXAMPLES <Preparation of Sheet> [Preparation Example 1] Density 0.91 g / cm ³ , MFR (ASTM D12
Titanium oxide powder (Lionite, Lionion, average particle size: 5) was added to 100 parts by weight of homopolypropylene having a 6.5 g / 10 min.
30 parts by weight), and put into an extruder to be melted.
Was formed. Next, this film was subjected to hot roll stretching in the MD direction to obtain a perforated film having a thickness of 20 μm (surface area: 0.17 m ² / g, porosity: 15%). The perforated film was charged by a charge applying device to which a DC voltage of -20 kV was applied to obtain a sheet.

[Production Example 2] For comparison, a film was produced in the same manner as in the above-mentioned sheet production example 1 except that the titanium oxide powder was not blended, and this was used as a sheet.

[Production Example 3] The perforated film obtained in Production Example 1 was charged by a charge application device to which a DC voltage of -20 kV was applied, and then defibrated through a defibration cutter.
A nonwoven fabric was prepared by a card method to obtain a sheet.

[Preparation Example 4] For comparison, a nonwoven fabric was prepared in the same manner as in Sheet Preparation Example 3 except that the titanium oxide powder was not used, and this was used as a sheet.

[Examples 1 and 2] The sheet and the sheet obtained in the above-mentioned production example were continuously bent by using a heating roll having a peak and a valley, and the height from the bottom of the valley to the top of the ridge was obtained. A first sheet having a length of 1.7 mm and a pitch of 3.0 mm and having a large number of peaks and valleys continuously formed was prepared. This first
The sheet is superimposed on a flat second sheet of the same sheet, and the contact portion between the bottom of the valley of the first sheet and the surface of the second sheet is bonded using a hot-melt adhesive.
A unit as shown in (b) was prepared. Using the 90 units, a width of 2
A filter having a length of 55 mm, a length of 165 mm and a depth of 5 mm was prepared. Using this filter, the pressure loss and the collection efficiency were measured, and the deodorizing performance and antibacterial deodorizing performance were also evaluated. Table 1 shows the results.

[Comparative Examples 1 and 2] Filters were produced from the sheets obtained in the above production examples and the same method as in Examples 1 and 2, and each measurement and evaluation were performed. Table 1 shows the results.

[0055]

[Table 1]

Measurement of Collection Efficiency The collection efficiency was measured using an apparatus schematically shown in FIG. First, the aerosol generator (manufactured by Nippon Kagaku Kogyo) 21 to N
aCl particles (particle size: 0.3 to 0.5 μm) were supplied through an air filter 22 into a chamber 23 into which clean air was introduced. After the concentration of NaCl in the chamber becomes constant (2 to 6 × 10 ⁶ / cm ³ ), suction is performed in the direction of the arrow by the suction device 24 through the filter sample 25 arranged at the bottom of the chamber 23. NaC on the upstream 26 and downstream 27 sides of the filter sample 25 when the wind speed passing through the filter becomes a constant speed (1 m / sec)
The l particle concentration C _in and C _out, a particle counter (Rion Co. KC-01B) 28a, respectively, determined by 28b, was determined trapping efficiency by the following equation. 29
Is a flow meter, and 30 is a flow control valve. Collection efficiency (%) = (1−C _out / C _in ) × 100

Measurement of pressure loss Using a differential pressure gauge (KD146 manufactured by Yamatake Honeywell Co.), the measurement was performed simultaneously with the measurement of the collection efficiency. However, the wind speed is 1m / sec
And Deodorizing Performance Using a measurement box and a cigarette smoker described in JEM1467, the filter sample was attached to a commercially available air purifier, and a 1-hour dust collection performance test was performed. A sensory test was conducted by 20 persons for the smell of the cigarette in the measurement box, and evaluated according to the following criteria. ○ The number of persons whose cigarette odor is reduced is 10 or more, and the number of persons whose cigarette odor is not reduced is less than 10 persons. Based on the unified test method by the Evaluation Committee for Antibacterial and Deodorant Performance Textile Products (SEK), Staphylococcus aureus was inoculated on the evaluation sample and nylon standard white cloth (unprocessed), and the number of viable bacteria after 18 hours of culture was counted. The bacteriostatic activity value was determined by the following equation. Bacteriostatic activity value = log B-log CB: Number of bacteria after 18 hours of cultivation of a nylon standard white cloth, C: Number of bacteria of an evaluation sample after 18 hours of culturing. The case where the bacteriostatic activity value was 2.2 or more was evaluated as having antibacterial and deodorant performance, and the case where it was less than 2.2 was evaluated as having no antibacterial and deodorant performance. The measurement was performed using a surface area mercury intrusion porosimeter (Autoscan-33 Porosimeter, product name of Yuasa Ionics). The weight of the porosity sample is measured, the virtual thickness Tw is obtained from the density of the resin in a dense state, and the actual thickness of the sample (by a commercially available thickness measuring device) To is obtained by the following equation. Was. Porosity (%) = {(To−Tw) / To} × 100

[Brief description of the drawings]

FIG. 1A is a perspective view showing a conventional honeycomb air filter, and FIG. 1B is a sectional view of a part of the filter element.

FIG. 2 is a diagram illustrating an example of a method for manufacturing an air filter according to the present invention.

FIG. 3 is a schematic diagram showing a configuration of an apparatus used for measuring a collection efficiency.

[Explanation of symbols]

A Honeycomb Filter h Honeycomb Height w Honeycomb Width 1 First Sheet 2 Second Sheet 3 Crests 4 Valleys 5 Units 6 Voids 21 Aerosol Generator 22 Air Filter 23 Chamber 24 Suction Device 25 Filter Sample 26 Upstream 27 Downstream 28a, 28b Particle counter 29 Flow meter 30 Flow control valve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 39/14 B01D 39/14 G B32B 3/28 B32B 3/28 C 5/18 101 5/18 101 5 / 26 5/26 5/32 5/32 (72) Inventor Yoshihiro Saku 3-5-2 Kasumigaseki, Chiyoda-ku, Tokyo Mitsui Chemicals, Inc.F-term (reference) 4D019 AA01 BA13 BB03 BB08 BC01 BC05 BC06 BC07 BC10 BD10 CA01 CB06 4F100 AA21 AA21H AA37A AA37B AA37C AA37H AK07 AT00A AT00B AT00C BA01 BA02 BA03 BA04 BA05 BA08 BA10B BA10C BA14 CA12 CA12A CA12B CA12C CA23A CA23B CA23C DC01 DD1206 DJG01B01 DG01A DG01A DG01A DG01A JG10B JG10C JK01 JL00 JL08A JL08B JL08C YY00A YY00B YY00C

Claims (10)

[Claims] 1. A honeycomb filter comprising a sheet made of a perforated film and having continuous voids formed in a large number of ridges and valleys. 2. A non-woven fabric formed of perforated fibers,
A honeycomb filter made of a sheet in which continuous voids are formed in a large number of ridges and valleys. 3. The honeycomb filter according to claim 2, wherein the perforated fiber is a defibrated yarn obtained by defibrating a perforated film. 4. The honeycomb filter according to claim 1, wherein a flat second sheet is laminated on the first sheet made of the sheet. 5. The honeycomb filter according to claim 4, wherein the flat second sheet is the nonwoven fabric made of the perforated film or perforated fiber. 6. The method according to claim 4, wherein the first sheet and the second sheet are alternately laminated, and a contact portion between a peak or a valley of the first sheet and the second sheet is fused or bonded. The honeycomb filter according to the above. 7. The honeycomb filter according to claim 1, wherein the sheet is electret. 8. The honeycomb filter according to claim 1, wherein the surface area of the perforated film or perforated fiber is 20 cm ² / g or more. 9. The perforated film or perforated fiber contains at least one agent selected from deodorants, antibacterial agents, antiviral agents, gas adsorbents, activated carbon and photocatalysts. The honeycomb filter according to any one of the preceding claims. 10. The film according to claim 1, wherein the perforated film is a film obtained by stretching a film formed using a resin containing a filler.
The honeycomb filter according to any one of the above.