JPH05305213A - Air purifying sheet and air purifying filter using the same - Google Patents

Abstract

PURPOSE:To provide an air purifying sheet capable of fixing particles of an active substance in a state capable of sufficiently developing the adsorbing activity action of said substance and excellent in the removing effect of a malodor and harmful gas and an air purifying filter using said sheet. CONSTITUTION:Adhesive layers 2 are provided to both surfaces of a sheet base material 1 and active particles 3 are fixed to the sheet base material 1 in such a state that they are partially embedded in the adhesive layers 2. The active particles 3 are at least one kind of a substance selected from the group consisting of activated carbon, a silica gel, activated alumina, zeolite and a catalyst and the thickness of each of the adhesive layers 2 is 1/2-1/10 the mean particle size of active particles 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purification sheet which has active particles and purifies air by a gas adsorption action, and an air purification filter obtained by processing the air purification sheet into a filter shape.

[0002]

2. Description of the Related Art Recently, there has been an increasing demand for air purification for removing malodorous or harmful gas components in the air. That is, in the living space and the office space, the need for air purification for removing a bad odor such as a cigarette odor is increasing with the sealing and the orientation of comfort. On the other hand, in manufacturing sites in the production industry, an offensive odor such as an organic chlorine solvent and a hydrocarbon solvent may be generated, and a harmful gas may be generated, and there is an increasing demand for air purification due to the necessity of improving the working environment.

[0003] Conventionally, as materials used for cleaning these air, activated carbon, silica gel, activated alumina, zeolite, and adsorbents or catalytic reaction active substances such as catalysts (in the present specification, these substances are collectively referred to as these substances. There is an active substance). In this manner, the adsorbent is used to remove the malodorous and harmful components in the air by adsorption, and the reactive substance is used to decompose and remove the malodorous and harmful components by the chemical reaction of the catalyst.

Since the active substance itself is a powder or granules, in order to fix the substance and maintain good contact with air, a trace amount has been conventionally used in an activated alumina carrier having pores. The catalyst is supported, or this substance is mixed with an adhesive and molded into a sheet, beads, granules, pellets or a porous body for use.

That is, in the air purification sheet 10 shown in FIG. 4, the active substance 11 and the adhesive component 12 are mixed and then extruded into a sheet form.

In the sheet shown in FIG. 5, an adhesive layer 14 is provided on the sheet base material 13, and the adhesive layer 14 is provided.
The active substance 15 is brought into contact with and fixed to the sheet base material 13. In these sheets, the active substance is often adhered and fixed to urethane and ceramic materials having a mesh structure or paper and aluminum materials having a honeycomb structure.

Further, in the sheet shown in FIG. 6, the active substance 18 and the adhesive component 17 are mixed and coated on the sheet base material 16 (JP-A-2-273512).

[0008]

However, although the active substance is used because of its active adsorption and reaction, the adhesive itself for fixing the powder or granules has the adsorption and reaction action. Often there is no such effect or inferior. Moreover, as a result of these adhesives covering the surface of the active ingredient, the action of the active substance is often diminished.

That is, in the air purification sheet shown in FIG. 4, since the active substance 11 is coated on the adhesive component 12, the active substance 11 and the air directly contact with each other in a small area. Be done. Further, in order to reduce this adverse effect as much as possible, it is conceivable to use a point-adhesive type adhesive, but if this is done, the adhesive strength of the active substance will decrease.

In the air purification sheet shown in FIG. 5, the active substance 15 is formed only by the surface contact with the adhesive layer 14.
Therefore, there is a drawback that the adhesive strength is low. Therefore, the active substance is easily released during use, and the amount of the active substance cannot be increased.

Further, in the air purification sheet shown in FIG. 6, the active substance 18 can be prevented from coming off, but since the active substance 18 is covered with the adhesive component 17, the active substance 18 is covered with the adhesive component 17.
Similar to the sheet of 1), it has the drawback that the active properties are impaired.

As described above, in each of the conventional sheets, the adhesive strength of the active substance is low, or the active substance is mixed with the adhesive and used, so that the properties of the active substance cannot be sufficiently exhibited. There are drawbacks. For this reason, the conventional air purification filters have the drawbacks of low practicality and low effect of removing bad odors or harmful gases.

The present invention has been made in view of the above problems, and particles of an active substance can be fixed in a state in which the active action thereof can be sufficiently exerted, and an excellent effect of removing malodor and harmful gas is obtained. An object is to provide an air purification sheet and an air purification filter using the same.

[0014]

An air purification sheet according to the present invention comprises a sheet base material, an adhesive layer provided on the surface of the sheet base material, and a part of the adhesive layer embedded in the adhesive layer. And adsorbent particles fixed to the sheet base material,
The adsorbent particles are activated carbon, silica gel, activated alumina,
It is characterized in that it is at least one kind of particles selected from the group consisting of zeolite and catalyst.

Further, the air purification filter according to the present invention is
Providing a plurality of cuts in the air purification sheet, by pulling the sheet to open the portion of the cut to form ventilation holes, or to form the air purification sheet in a corrugated shape, further the surface of the sheet It is characterized in that a plurality of ventilation passages are processed and formed in the direction along.

In this case, the sheet base material includes plain paper, flame-retardant paper, glass fiber paper, carbon fiber paper and the like, as well as aluminum and copper thin metal plates (foil).

Examples of the adhesive layer include a thermoplastic resin adhesive, a thermosetting resin adhesive, and an inorganic adhesive. In the present invention, a portion of at least one active particle selected from the group consisting of activated carbon, silica gel, activated alumina, zeolite and catalyst is embedded in this adhesive layer and fixed to the sheet base material. There is.

[0018]

In the present invention, while holding the adhesive,
Since the sheet base material that holds the shape of the entire sheet is provided separately from the adhesive layer, the amount of adhesive can be smaller than when the shape is maintained only with the active substance and the adhesive, and the active Since only a part of the particles themselves are embedded in the adhesive layer, the contact interface between the particles of the active substance and the adhesive is small. Therefore, the adhesive is prevented from covering the surface of the active substance and adversely affecting its action. Furthermore, since a part of the particles of the active substance are embedded and adhered in a thin adhesive layer, the adhesive strength is high, and therefore the above-mentioned active substance inherently has the action characteristics (adsorption or active decomposition action). The active particles can be firmly fixed without damaging the particles.

In particular, the thickness of the thin adhesive layer provided on the base sheet is preferably 1/2 to 1/10 of the average particle diameter of the active substance adhered by the adhesive layer. When the thickness is in this range, the adhesive strength is practically sufficient. Further, in order to obtain sufficient action characteristics of the active substance, it is preferable that the thickness of the adhesive layer is within this range.

The active substance may be provided on only one side of the sheet base material, or may be provided on both sides thereof. When both sides of the sheet base material are used, an adhesive layer may be provided on both sides of the sheet base material and the active particles may be fixed by the adhesive layer.

Further, a large number of cuts are provided in the sheet,
By pulling this sheet, in the air purifying filter in which the cut portion is opened and the ventilation hole is provided, ventilation can be performed in the direction perpendicular to the surface of the sheet base material through the ventilation hole.

Further, it is also possible to obtain an air purifying filter by corrugating the above-mentioned sheet base material provided with an active substance, and processing and forming so that a large number of ventilation passages are provided in a direction parallel to the sheet base material.

In these air purification filters, air is purified by the active particles as it passes through the ventilation holes or ventilation passages.

[0024]

EXAMPLE An air purifying sheet and a filter according to an example of the present invention will be described below with reference to the accompanying drawings and comparison with a comparative example.

First, an example of the structure of the air purification sheet according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the adhesive layers 2 are thinly formed on both sides of the sheet base material 1, some of the particles 3 of the active substance are embedded in the adhesive layer 2, and the active particles 3 are formed by the adhesive layer 2. Is fixed to the sheet base material 1.

The air purification sheet thus constructed is
A filter can be constructed as shown in FIGS. As shown in FIG. 2, the air purification sheet 5 is provided with a large number of notches 6, and the sheet 5
As shown in FIG. 3, the vent hole 7 can be formed by pulling the notch 6 in the direction orthogonal to the length direction of the notch 6. This makes it possible to obtain an air purification filter through which air flows through the vent 7.

Next, the characteristics of the thus-constructed air purification sheet and the air purification filter using the same will be described in comparison with the characteristics of the conventional or comparative product.

Example 1 Base material sheet; basis weight (weight per unit area of 1 m ² ) is 80 g /
m ² Water-resistance imparting liner paper adhesive; Acrylic resin adhesive applied to both sides of this base sheet to a thickness of 65 μm Active substance; Crushed activated carbon with an average particle size of 280 μm Adhesion situation; As shown in FIG. Double-sided Adhesion Adhesion Method: Activated carbon powder particles 3 are sprinkled on the base material sheet 1 coated with the adhesive layer 2 and pressed by a rubber roller to adhere them, and then the sheet base material 1 is vibrated to generate excess unbonded activated carbon particles. 3 was removed.

As a result, in this example, as the activated carbon-impregnated paper, it was possible to obtain a large amount of activated carbon particles impregnated with 380 g / m ² , and the adhesive strength was also sufficient. In addition, since the activated carbon that can be impregnated in a large amount is arranged in a state where it exhibits sufficient activity, its adsorption effect is high. On the other hand, in the conventional sheet shown in FIG. 6, the activated carbon impregnation amount is 90%.
It was about g / m ² .

Example 2 Substrate sheet: Aluminum foil having a thickness of 70 μm Adhesive; Hot-melt adhesive is applied to both sides of this substrate sheet to a thickness of 80 μm Active substance; Deodorant-impregnated silica gel having an average particle size of 350 μm 30 %, 70% by weight of crushed activated carbon with an average particle size of 280 μm
Adhesion of the mixed material on both sides Adhesion condition: Same as in Example 1 (FIG. 1) Adhesion method: Same as in Example 1, but induction heating was performed immediately before pressing the rubber roller.

As a result, an air purification sheet having an impregnated amount of 540 g / m ² was obtained.

Example 3 Substrate sheet; Glass fiber paper having a basis weight of 120 g / m ² Adhesive; Inorganic adhesive applied to both sides to a thickness of 220 μm Active substance; Fe-Mn-based catalyst having an average particle size of 350 μ Adhesive on both sides Adhesive condition: Since glass fiber paper is a porous sheet,
The same bonding method as in Example 1 (FIG. 1), except that the base material was also soaked with the adhesive; after the bonding treatment was carried out in the same manner as in Example 1, the temperature was raised to 450 ° C. in the atmosphere. Heat treatment was carried out for an hour to solidify the inorganic adhesive.

As a result, a catalyst sheet having an excellent heat resistance of 450 ° C. and excellent catalyst characteristics was obtained.

Example 4 The air purification sheet impregnated with the activated carbon obtained in Example 1 was used, and the depth of the valley was 2.6 mm.
After molding into a corrugated shape with a mountain pitch of 5.9 mm,
This was used as an ozone decomposition filter for a dry copying machine. Filter size is width 200mm, height 60mm, thickness 2
It is 0 mm. The ozone concentration at the entrance was 1 ppm, the wind velocity on the filter surface was 2 m / sec, and the temperature and humidity were 20 ° C and 60%, respectively. As a result, as shown in Table 1 below, the filter of Example 4 was excellent in ozone decomposing performance as compared with the conventional filter, and the pressure loss was also extremely small.

[0035]

[Table 1]

Accordingly, a filter having a low pressure loss and an ozone resolution comparable to that of a high cell product was obtained.

Example 5 The deodorizing sheet obtained in Example 2 was provided with a large number of notches 6 as shown in FIG. 2, and the sheet 5 was stretch-formed into an expanded lattice as shown in FIG. 3 to obtain a filter. Was manufactured. The deodorizing filter of this embodiment has a pressure loss of 0.2 mmAq as a result of being installed at the air conditioner discharge port with a passing surface wind velocity of 4 m / sec.
(Head pressure) or less, and could be used in a state without excessive wind noise. The specifications such as filter cost and deodorizing performance were also satisfied.

Example 6 The catalyst sheet obtained in Example 3 was attached to the inner wall surface of a microwave oven and subjected to deodorization during cooking and heating. As a result, the effect of preventing offensive odor scattering to the outside was obtained.

[0039]

As described above, according to the present invention,
Since the active substance can be fixed firmly and in a large amount without impairing the adsorption performance of a malodorous component or the like or the decomposition performance of ozone or the like, an extremely excellent air purification sheet and air purification filter can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an air purification sheet according to an embodiment of the present invention.

FIG. 2 is a diagram showing an air purification filter according to an embodiment of the present invention.

FIG. 3 is a diagram showing a usage state of the air purification filter of the same.

FIG. 4 is a view showing a conventional air purification sheet.

FIG. 5 is a view showing another conventional air purification sheet.

FIG. 6 is a view showing still another conventional air purification sheet.

[Explanation of symbols]

 1; Sheet Base Material 2; Adhesive Layer 3; Active Particles 5; Sheet 6; Notches 7; Vents 11, 15, 18; Active Substances 12, 17; Adhesive Components

Claims (5)

[Claims] 1. A sheet base material, an adhesive layer provided on the surface of the sheet base material, and active particles partially embedded in the adhesive layer and fixed to the sheet base material. The air purification sheet, wherein the active particles are particles of at least one selected from the group consisting of activated carbon, silica gel, activated alumina, zeolite and catalysts. 2. The air purification sheet according to claim 1, wherein the thickness of the adhesive layer is 1/2 to 1/10 of the average particle diameter of the active particles. 3. The air purification sheet according to claim 1, wherein the adhesive layer and the active particles are provided on both front and back surfaces of the base material. 4. The air purification sheet according to claim 1, wherein a plurality of cuts are provided, and by pulling the sheet, the cut portion is opened to form a ventilation hole. A characteristic air purification filter. 5. The air purification sheet according to claim 1, wherein the air purification sheet is formed into a corrugated shape, and a plurality of ventilation passages are formed in a direction along the surface of the sheet. Air purification filter.