JP5861450B2 - Flame retardant deodorizing filter - Google Patents

Description

  The present invention relates to a flame retardant deodorizing filter for removing harmful gas components incorporated in electronic devices such as copiers, printers, multi-function OA machines, computers, projectors, POD printers, etc., with low pressure loss and high efficiency. The present invention relates to a flame retardant deodorizing filter. The toxic gas component referred to here includes not only harmful gas components that affect the human body and the environment, but also gases that cause problems inside the electronic equipment.

  In recent years, electronic devices such as copiers, printers, multi-function OA machines, computers, projectors, and POD printers have been increasingly integrated and miniaturized. It is becoming indispensable. In addition, various components contained in components such as ink, toner, etc. used for printing, plastics constituting the main body of electronic equipment, rubber used in various joints, etc. are gasified, and harmful gas components It is discharged into the room along with exhaust heat. In addition, since a high voltage is used in a copying machine, a laser printer, and the like, not only the gas components but also harmful gas components such as ozone are discharged. In recent years, due to increased awareness of environmental issues, emission regulations have been implemented for harmful gas components. For example, in Germany, an environmental label “BAM (Blue Angel Mark)” has been established, and environmental performance standards to be achieved for each electronic device are defined.

  In order to reduce harmful gas components discharged from the electronic apparatus, a deodorizing filter is incorporated in the electronic apparatus. Since the deodorizing filter is incorporated in an electronic device, it not only excels in removing harmful gas components, but it is essential to acquire a flame retardant standard UL (Underwriters Laboratories Inc.) (see Non-Patent Document 1).

A flame-retardant ozone VOC removal filter for removing ozone and VOC by being incorporated in electronic devices such as laser printers and various air conditioners is well known. For example, Patent Document 1 describes a multilayer deodorizing filter medium in which two or more different types of deodorized powder particles are supported on a cover material made of fabric.
However, the filter medium of Patent Document 1 has a fiber web only on one side, and the hot-melt resin connected at the time of combustion melts, and the deodorized granular material drops as a flammable substance, so that the flame retardancy is insufficient. There was a problem.

  An adsorption sheet containing an adsorbent and a thermoplastic resin between base material layers is disclosed (for example, see Patent Documents 2 and 3). In these adsorbing sheets, there are base material layers above and below the adsorbing layer, but since these adsorbing sheets do not contain a flame retardant in the base material, the base material melts during combustion and is further mixed with the adsorbent. There was a problem that the thermoplastic resin melted and the adsorbent dropped as a flame retardant, resulting in insufficient flame retardancy.

  Patent Document 4 describes that potassium carbonate is added to activated carbon in order to improve the ozone removal performance by activated carbon. Alkali metal compounds and alkaline earth metals added to assist the ozone decomposition function are described. Because the combustion of activated carbon during combustion and the cover material melts, the adsorbent is dripped as a flammable substance, resulting in insufficient flame retardancy, and adhering to the activated carbon as the adsorbent. There was a problem that the VOC performance deteriorated.

  Patent Document 1 describes that activated carbons or activated carbon and a cover material are connected or fixed by a hot-melt resin, but in the formation of a sheet using a hot-melt resin or a nonwoven fabric, the adhesion between the activated carbons is insufficient. Therefore, there has been a problem that activated carbon drops frequently during normal use, and that activated carbon is dropped as a flammable substance during combustion, and sufficient flame retardancy cannot be obtained. The term “normal use” as used herein refers to use at a temperature condition of −20 to 80 ° C.

  Patent Document 5 describes that a deodorant powder is adhered to a synthetic resin net with a binder. However, since the deodorizer is immersed in a binder solution, the deodorization performance is deteriorated or the deodorizer layer is handled or used. There was a problem of dropping out.

As described above, deodorizing filters for removing harmful gas components incorporated in electronic devices such as copiers, printers, multi-function OA machines, computers, projectors, and POD printers, use activated carbon for the purpose of VOC adsorption. A material having a large specific surface area is used, and various chemical substances are added to improve the chemical ozone treatment performance. Although flame retardancy can be improved by applying a flame retardant to the filter medium, the amount of chemical substances attached is limited and satisfactory ozone performance cannot be obtained.
In addition, if the activated carbon layer does not contain thermoplastic resin binder particles, not only the activated carbon particles are dropped off during normal use, but the activated carbon particles are dropped as a flammable substance during the combustion test, and sufficient flame retardancy is There was a problem that it could not be obtained.

  In addition, there is a thickness limitation for making a pleated shape with a conventionally known deodorizing filter, it is difficult to increase the amount of adsorbent filled in the intermediate layer, and adsorption with a small particle size to improve the collection efficiency When an agent is used, it is difficult to achieve both life and efficiency because it is necessary to reduce the amount of adsorbent and to make the front and back fiber layers dense from the viewpoint of ventilation resistance.

Japanese Patent Laid-Open No. 11-57467 JP 2008-206550 A JP 2007-301434 A JP 2008-114109 A Japanese Patent No. 3544161

UL 94: Standard for Safety Tests for Flammability of Plastic Materials for Parts in Devices and Applications.

  The present invention was devised in view of the above-described state of the art, and is incorporated into electronic devices such as copiers, printers, multi-function OA machines, computers, projectors, and POD printers to remove harmful gas components. An object of the present invention is to provide a deodorizing filter that can be used and that has sufficient flame retardancy during combustion.

  As a result of intensive research to achieve the above object, the present inventor has made it possible to achieve high efficiency while suppressing an increase in pressure loss by using a fabric carrying activated carbon particles on the upstream side, and a fiber that carbonizes during combustion. The cover material is used as a cover material, and the cover material is made flame retardant, so that the cover material does not melt at the time of combustion, and the falling off of the activated carbon particles from the activated carbon layer can be suppressed. Reached completion.

That is, the present invention is as follows.
1. A deodorizing filter formed by laminating an activated carbon sheet and a activated carbon sheet carrying activated carbon particles on the surface and / or inside of a fabric comprising at least a surface mainly composed of a thermoplastic resin, and flowing the activated carbon supported cloth into the deodorizing filter. The flame-retardant deodorizing filter is arranged on the side and the activated carbon sheet is arranged on the outflow side.
2. The activated carbon sheet comprises an activated carbon layer and a cover material provided on both surfaces thereof, and the cover material is at least 30% or more of at least one kind of fiber selected from cellulose fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, and phenol fiber. Containing 10 to 80% by weight of a phosphorus-based flame retardant with respect to the weight of the cover material, and the activated carbon particles in the activated carbon layer are fixed by the polyester resin or polyamide resin binder particles, ^2. The flame-retardant deodorizing filter according to 1 above, wherein the basis weight is 50 to 400 g / m ² .
3. 3. The flame retardant deodorizing filter according to 1 or 2 above, wherein the activated carbon layer is a mixture of activated carbon particles and polyester resin or polyamide resin binder particles in an amount of 1 to 15% by weight based on the weight of the activated carbon particles.

  The flame-retardant deodorizing filter of the present invention is obtained by the cover material that does not melt at the time of combustion. By laminating the activated carbon sheet having adhesive properties and the activated carbon-supporting fabric, a filter satisfying both high-efficiency flame retardancy and VOC removal / ozonolysis performance with low pressure loss can be obtained.

The schematic sectional drawing of the flame-retardant deodorizing filter of this invention is shown.

Hereinafter, the flame-retardant deodorizing filter of the present invention will be described in detail.
As shown in FIG. 1, the flame retardant deodorizing filter of the present invention has an activated carbon supporting material in which activated carbon particles are supported on the surface and / or inside of a fabric composed of fibers made of thermoplastic resin at least on one side. Fabric C is used. Moreover, it consists of the activated carbon layer A and the cover material B provided on both surfaces thereof, and the cover material B uses an activated carbon sheet containing fibers that are carbonized during combustion and flame-retarded. In the activated carbon layer A, activated carbon particles are fixed by thermoplastic resin binder particles.

  As a form of the fabric used for the activated carbon-supported fabric C of the present invention, a woven fabric, a knitted fabric, a nonwoven fabric, or a composite fabric obtained by appropriately combining these can be selected as appropriate. Specifically, those prepared by the spunbond method, meltblown method, card method or wet papermaking, and further, these various webs may be entangled with needle punch or high pressure water flow.

  The fibers constituting the activated carbon-supported fabric C are made of at least one or two or more kinds of thermoplastic resins on the surface, and the fiber surface has a single composition having a single composition or a plurality of components concentrically in cross section. It can be set as composite fibers, such as the arranged core-sheath type fiber.

  The step of fixing and supporting the activated carbon particles on the surface and / or inside of the fabric includes a method of spraying an air stream containing heated activated carbon particles on the fabric, a method of allowing the heated activated carbon particles to fall naturally on the fabric, and heated activated carbon. After applying any method such as exposing the fabric to the fluidized bed of particles, it is preferable to cool the fabric until the activated carbon particles are fixed, and to remove excess activated carbon not fixed to the fabric surface with air or the like.

  The average particle diameter of the activated carbon particles supported on the activated carbon-supporting fabric C is preferably equal to or less than the fiber diameter on which the activated carbon particles are supported.

The activated carbon particles used for the activated carbon layer A in the filter of the present invention are not particularly limited as long as harmful gas components can be removed. For example, coal-based activated carbon, coconut shell activated carbon, wood-based activated carbon, and the like can be used. The specific surface area of the activated carbon particles used is preferably 1000 m ² / g or more, more preferably 1400~2000m ² / g. If the specific surface area is less than 1000 m ² / g, toluene removal performance may be lowered.

  The average particle diameter of the activated carbon particles of the present invention is not particularly limited, but is preferably 50 to 850 μm. When the average particle diameter is less than 50 μm, dust and the like are generated, so that the handleability is deteriorated, and when it exceeds 850 μm, formation of the activated carbon layer may be difficult. In particular, the particle size of the activated carbon particles carried on the fiber made of a thermoplastic resin is preferably 50 to 250 μm.

  For the activated carbon particles of the present invention, impregnated activated carbon particles impregnated with an alkali metal compound and an alkaline earth metal compound may be used to assist the ozonolysis function.

  Specific examples of the alkali metal compound and the alkaline earth metal compound include alkali metal hydroxides such as sodium, potassium and lithium, oxides, carbonates, bicarbonates, acetates, and oxalic acid. Salts, phosphates, sulfates, succinates, phthalates, salts of aqueous solutions such as hydrogen phthalate, halides and the like can be mentioned. Alkaline earth metal compounds include alkaline earth metal hydroxides such as calcium, magnesium and barium, salts of aqueous solutions such as oxides, carbonates, bicarbonates, acetates, oxalates and phosphates. And halides.

  The activated carbon layer A of the present invention preferably contains thermoplastic resin binder particles in order to adhere the components of the activated carbon layer to each other and improve the handleability when forming the activated carbon layer. As the thermoplastic resin binder particles, a thermoplastic resin having a large critical oxygen index (LOI value) such as a polyester resin, a urea resin, a polyamide resin, or a polyimide resin can be used. Among these resins, polyester resins and polyamide resins are preferable from the viewpoints of economy and availability.

  The average particle diameter of the thermoplastic resin binder particles is not particularly limited, but is preferably 1.0 to 150 μm. More preferably, it is 5.0-80 micrometers. When the average particle diameter is less than 1.0 μm, dust and the like are generated, so that the handleability is deteriorated, and when it exceeds 150 μm, there is a possibility that the activated carbon is not mixed uniformly.

  The melting point of the thermoplastic resin binder particles is preferably 80 ° C. to 150 ° C. in consideration of the environmental temperature of office equipment and the like. More preferably, it is 100 degreeC-130 degreeC.

  The fluidity at the time of melting of the thermoplastic resin binder particles is an MI value described in JIS K 7210, preferably 1 to 80 g / 10 min. More preferably, it is 3-30 g / 10min. If it is this range, activated carbon can be adhere | attached firmly, preventing the coating | cover of the surface of activated carbon.

The activated carbon particle content in the activated carbon layer A is preferably 50 to 400 g / m ² . More preferably, it is 100-350 g / m < ² >. More preferably, it is 200-300 g / m < ² >. When the content of the activated carbon particles is less than 50 g / m ² , the performance of removing harmful gases such as toluene is lowered. When the content exceeds 400 g / m ² , the activated carbon becomes more effective as a combustion product, and therefore satisfies the UL standard. I can't.

  The content of the thermoplastic resin binder particles in the activated carbon layer A is preferably 1 to 15 parts by weight with respect to 100 parts by weight of the activated carbon particles. More preferably, it is 3 to 10 parts by weight. If the content of the thermoplastic resin binder particles is less than 1 part by weight, the activated carbon layer may not be firmly fixed and may peel off. If the content exceeds 15 parts by weight, both flame retardancy and VOC / ozone performance must be satisfied. May not be possible.

  The flame-retardant deodorizing filter of the present invention needs to have a fabric as the cover material B on both surfaces of the activated carbon layer A. With such a laminated structure, the activated carbon can be prevented from falling off during the combustion test. The fabric to be used is not particularly limited, but can be composed of, for example, a nonwoven fabric, a knitted fabric, or a woven fabric, and a nonwoven fabric is particularly preferable. From the viewpoint of preventing the activated carbon particles from falling off during the formation of the filter, those having a particle size smaller than the particle size of the activated carbon particles are preferable.

  As a nonwoven fabric, what is made from the fiber containing the 1 type or more fiber selected from a cellulose fiber, a polyvinyl alcohol fiber, a polyacrylonitrile fiber, and a phenol fiber is preferable. It is preferable that 30 to 100% of any of these fibers is contained in order to maintain the fiber shape during combustion.

  As a method for producing the nonwoven fabric, a thermal bond method, a chemical bond method, a needle punch method, a spunlace method (a hydroentanglement method), or the like can be used. It is also preferable that the fabric is made of fibers spun by kneading a flame retardant.

Although the fabric weight and thickness of the fabric used for the cover material B are not particularly limited, the fabric weight is preferably 10 g / m ^{2 to} 45 g / m ² and the thickness is 0.05 mm to ² mm. If the basis weight is less than 10 g / m ² , the activated carbon particles fall off from the fabric during processing of the activated carbon sheet, and if it exceeds 45 g / m ² , the workability during formation of the activated carbon sheet may be deteriorated. If the thickness is less than 0.05 mm, the activated carbon particles fall off from the fabric during sheet processing, and if it exceeds 2 mm, the handleability during formation of the activated carbon sheet may be deteriorated. Here, the thickness of the fabric refers to the thickness measured at 7 gf / cm ² load.

  In the present invention, the fabric used for the cover material B preferably contains a flame retardant. This is because the presence of a flame retardant in the fabric has the effect of making the fabric itself flame retardant and the effect of maintaining the fiber shape of the fabric during combustion.

  The flame retardant contained in the fabric used for the cover material B is preferably a phosphorus-based flame retardant from the viewpoint of the flame retardant effect, and is applied to the fabric and dried, so that a water-soluble flame retardant such as guanidine phosphate, Ammonium phosphate and ammonium polyphosphate are more preferable.

  The fabric used for the cover material B preferably contains 10 to 80% by weight of the flame retardant with respect to the fabric weight. More preferably, it is 20 to 70% by weight. If the amount is less than 10% by weight, the flame retardancy of the entire filter may be insufficient. If the amount exceeds 80% by weight, the workability of attaching the flame retardant may be deteriorated and a problem such as an increase in pressure loss may occur. is there.

  The activated carbon layer A and the cover material B can be laminated and integrated by the thermoplastic resin binder particles in the activated carbon layer A or a separately provided adhesive layer.

As the adhesive layer, for example, a paste-like thermoplastic resin printed in the form of dots on the fabric, a spray of thermoplastic resin powder, or a spun web-shaped hot melt nonwoven fabric obtained by melt spinning the thermoplastic resin There are things such as. Basis weight of the adhesive layer is preferably ^{5~50g / m 2, 10~30g / m} 2 is more preferable.

  As the thermoplastic resin, a polyamide resin, a polyester resin, a polyurethane resin, a polyolefin resin, a polyolefin-modified resin, or the like can be used alone or in combination. Examples of the polyolefin-modified resin include ethylene-vinyl acetate copolymer, saponified ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer. Examples thereof include a polymer, an ethylene-maleic acid copolymer, and an ionomer resin (a heat-sensitive resin obtained by adding a metal to an ethylene-methacrylic acid copolymer). Moreover, although it is possible for the thermoplastic resin to contain a flame retardant, it is preferable that no flame retardant is contained in order to obtain excellent adhesiveness.

  Examples of a method of laminating the activated carbon layer A and the cover material B with an adhesive layer include a method using an adhesive and a method of laminating and integrating using a hot melt resin such as a hot melt nonwoven fabric or thermoplastic resin binder particles. There is no particular limitation. In order to laminate and integrate the cover material and the activated carbon particles with an adhesive or a thermoplastic resin, for example, a method of laminating a fabric, a hot melt nonwoven fabric, activated carbon particles, and integrating the laminated sheet by heat processing or the like, There is a method in which a fabric to which a heat-adhesive resin is attached is prepared and activated carbon particles are sandwiched between the fabrics to form a sheet. The latter method, in which the fabric with the pre-adhered heat-adhesive resin is prepared, is preferred because it has the advantage of reducing troubles in the production process.

The basis weight and thickness of the hot melt nonwoven fabric are not particularly limited, but the basis weight is preferably 5 g / m ^{2 to} 20 g / m ² and the thickness is preferably 0.05 mm to 0.5 mm. If the basis weight exceeds 20 g / m ² , the pressure loss of the filter may increase. When the thickness exceeds 0.5 mm, the handleability at the time of forming the activated carbon layer may be deteriorated. Further, if the basis weight is less than 5 g / m ² and the thickness is less than 0.05 mm, the adhesiveness is inferior and delamination may occur. Here, the thickness of the fabric refers to the thickness measured at a load of 7 gf / cm ² .

  The flame retardant deodorizing filter peel strength of the present invention is preferably 5 gf / cm to 100 gf / cm. More preferably, it is 15 gf / cm-80 gf / cm. If the peel strength is less than 5 gf / cm, the adhesive force between the cover material B and the activated carbon layer A is weak, and there is a possibility of causing delamination during sheet preparation.

  In the present invention, the activated carbon-supporting fabric A and the activated carbon sheet are laminated. When laminating the fabric A and the activated carbon sheet, they may be simply stacked and attached with a frame, or may be partially joined with various adhesives or binders.

  In the method of the present invention, as a method of using the laminated filter medium of the activated carbon-supporting fabric A and the activated carbon sheet, the activated carbon-supporting fabric A is disposed on the odor inflow side, the activated carbon sheet side is disposed on the outflow side, and gas is removed.

  The deodorizing filter of the present invention configured as described above does not drop activated carbon particles in the activated carbon layer not only during normal use but also during combustion, so it can not only effectively remove harmful gas components, but also UL. It has high flame retardancy that satisfies standard 94HF-1.

  Hereinafter, although an example shows an operation effect of a deodorizing filter of the present invention concretely, the present invention is not limited at all by these. In addition, the evaluation method of the characteristic value measured in the Example is shown below.

(Flame retardance)
Evaluation was carried out by a horizontal combustion test described in Non-Patent Document 1. In this horizontal combustion test, a supporting wire mesh that can place a test piece at a predetermined height is used, and absorbent cotton (marked cotton) is placed under the wire mesh at a distance of 175 ± 25 mm. A test piece that is cut into a strip shape of 150 ± 1 mm in length and 50 ± 1 mm in width on this wire mesh, and in addition, a total of two marked lines are written in advance from one end in the length direction to each position of 60 mm and 125 mm. Is installed. In the combustion test, after the test piece is placed horizontally, a flame is applied to the end portion described above from below the wire mesh for 60 ± 1 second, and then the flame is separated from the test piece. Timing from this point,
[A] Time when flame disappeared (residual flame) [b] Time when flame and red heat disappeared (residual dust) [c] Time when flame or red heat front reached 125 mm mark, or test specimen marked 125 mm Record three types of time, the time when combustion or red heat stopped before. Such an evaluation test is performed five times, and evaluation is performed according to two classifications of “94HF-1” or “94HF-2” as shown in Table 1 below.

(Toluene removal rate)
Air having a toluene concentration of 5 ppm was passed through the filter sample at a wind speed of 10 cm / second, and the toluene concentrations (ppm) at the inlet and outlet sides of the column were measured. The measurement conditions were a temperature of 25 ° C. and a humidity of 50%. These measured values were substituted into the following equation to calculate the toluene removal rate (%). In addition, in order to obtain | require initial efficiency, the toluene removal rate in 1 minute after the measurement start was calculated | required.

Toluene removal rate [%] = {1- (exit side toluene concentration [ppm] / inlet side toluene concentration [ppm])} × 100

(Ozone removal rate)
Air having an ozone concentration of 4 ppm was passed through the filter sample at a wind speed of 10 cm / second, and the ozone concentrations (ppm) at the inlet and outlet sides of the column were measured. The measurement conditions were a temperature of 25 ° C. and a humidity of 50%. These measured values were substituted into the following formula to calculate the ozone removal rate (%). In addition, in order to obtain | require initial efficiency, the ozone removal rate in 1 minute after the measurement start was calculated | required.

Ozone removal rate [%] = {1- (exit side ozone concentration [ppm] / inlet side ozone concentration [ppm])} × 100

(Average particle diameter)
Each particle was observed with a scanning electron microscope (SEM), the diameter of 100 particles was measured, and the average diameter was calculated therefrom.

(Adjustment of flame retardant)
A flame retardant solution comprising 50 parts of a phosphorus-based flame retardant liquid (aqueous solution in which a flame retardant was dissolved in water: dispersion concentration 60%) and 50 parts of water was prepared.

Example 1
(Preparation of cover material)
A rayon fiber / polyethylene terephthalate (hereinafter referred to as “PET”) fiber (weight ratio 70:30) mixed spunlace nonwoven fabric (weight per unit 24 g / m ² , thickness 0.16 mm) is impregnated with the flame retardant aqueous solution and dried. 34 g / m ² of cover material was obtained. Each cover material was a cover material in which a phosphorous flame retardant was attached to the fiber surface of a spunlace as a fabric, and the cover material contained 10 g / m ² of the phosphorous flame retardant.
(Activated carbon supported fabric)
Next, it is subjected to PET fiber (2.2 dtex, fiber length 51 mm), rayon fiber (1.7 dtex-fiber length 40 mm) card process, needle punch process, and the fibers are heat-sealed in a heat treatment process at 130 ° C. A fabric having a basis weight of 15 g / m ² was obtained. Next, the activated carbon particles (average particle diameter: 10 μm) were heated to 130 ° C., sprayed, and cooled to obtain a fabric having a basis weight of 20 g / m ² in which the activated carbon particles fixed to 5 g / m ² on the fiber surface.
(Activated carbon sheet)
On the flame retardant cover material, 150 parts by weight of activated carbon particles (average particle diameter: 500 μm) and 10.5 g / m ^{2 of} thermoplastic resin binder particles (average particle diameter: 50 μm, PET resin) were mixed. After sprinkling things to form an activated carbon layer, a cover material is stacked on the activated carbon layer, and then sandwiched between iron plates heated to 140 ° C. and heat-pressed for 1 minute, and the thermoplastic resin binder particles The activated carbon layer was fixed to produce an activated carbon sheet. The basis weight at this time was 228.5 g / m ² .
According to the above procedure, the activated carbon-supported fabric produced was placed on the gas inflow side, and the activated carbon sheet was placed on the gas outflow side and laminated to obtain the deodorizing filter medium of the example.

(Comparative Example 1)
The activated carbon sheet produced in the example was used on the gas inflow side, and the activated carbon-supported fabric produced in the example was used on the gas outflow side.

(Comparative Example 2)
Only the activated carbon sheet of the example was used in a single layer.

(Comparative Example 3)
Only the fabric carrying the activated carbon particles of the example was used.

(Comparative Example 4)
Next, the structure was the same as that of the example except that the activated carbon particles were bonded to the activated carbon-supported fabric.

(Comparative Example 5)
Except that the activated carbon particles were bonded and formed with a binder, the arrangement was the same as in the example.

(Comparative Example 6)
A fabric in which activated carbon particles are bonded and formed with a binder is arranged on the gas outflow side, and an activated carbon sheet is arranged on the gas inflow side.

  Table 2 shows the filter configurations and toluene / ozone performance evaluation results obtained in Example 1 and Comparative Examples 1 to 5.

  As is apparent from Table 2, in the embodiment which is the newly developed product, toluene and ozone can be removed effectively both in the initial removal rate and the life as compared with any of the comparative examples. In Comparative Example 1, it was confirmed that even if the structure was the same as that of the example, the gas could be removed more effectively depending on the arrangement relationship. From Comparative Example 1 and Comparative Example 2, it can be seen that although there is an effect of the fabric on ozone, the influence of the arrangement relationship is large. Further, Comparative Examples 3 and 4 have a very low removal performance due to a small amount of activated carbon, and Comparative Examples 5 and 6 have a performance degradation when the activated carbon particles are bonded with a binder.

  Since the flame-retardant deodorizing filter of the present invention is excellent in the removal of harmful gas components and flame retardancy, it is included in the exhaust gas of electronic devices such as copiers, printers, multifunctional OA machines, computers, projectors, and POD printing machines. It can be suitably used for a flame retardant deodorizing filter for removing contained harmful gas components, a flame retardant deodorizing filter used for a refrigerator, a toilet deodorizer, and the like.

DESCRIPTION OF SYMBOLS 1 Activated carbon particle 2 Thermoplastic resin powder A Activated carbon layer B Cover material C Activated carbon carrying | support cloth

Claims (3)

And activated carbon fabric at least the surface is stuck carrying heating activated carbon particle surface and / or inside of the fabric consisting mainly of fibers of a thermoplastic resin, a deodorizing filter obtained by laminating an active carbon sheet,
Before SL activated carbon sheet is composed of a charcoal layer and a cover material provided on both surfaces, the cover member is at least cellulose fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, one or more fibers selected from phenol fibers 30 % Or more, containing 10 to 80% by weight of a phosphorus flame retardant with respect to the weight of the cover material, and activated carbon particles in the activated carbon layer fixed by polyester resin or polyamide resin binder particles. ,
A flame-retardant deodorizing filter, wherein the activated carbon-supporting fabric is disposed on the inflow side, and the activated carbon sheet is disposed on the outflow side. Flame retardant deodorizing filter according to claim 1 having a basis weight of the activated carbon layer of activated carbon sheet is 50 to 400 g / ^{m 2.}   The flame retardant deodorizing filter according to claim 1 or 2, wherein the activated carbon layer is a mixture of activated carbon particles and polyester resin or polyamide resin binder particles in an amount of 1 to 15% by weight based on the weight of the activated carbon particles.