JPS63137725A - Filter for cleaning air - Google Patents

Abstract

PURPOSE:To enhance air cleaning efficiency and make the life of cleaning longer by putting adsorbents such as active carbon and the like into cells of honeycomb-shaped substrate, bonding both surfaces thereof with non-woven cloths with cobweb-shaped bonding sheets and constituting a filter to clean air. CONSTITUTION:A honeycomb-shaped substrate 1 and a non-woven cloth 2 are bonded together on one side only by a cobweb-shaped bonding sheet 4 through hot press or the like, and then an adsorbent 2 is sprayed uniformly over the same. Then, by placing a cobweb-shaped bonding sheet 4 over the same, on which a non-woven cloth 3 is placed, and heating up by a hot press or the like, a filter A to clean air is formed. The honeycomb-shaped substrate 1 is prepared by curing lightly with phenol resin or the like after folding an aluminum sheet or the like and bonding with an adsorbent, and cutting the same into pieces of given size. For the bonding sheet 4, a cobweb-shaped bonding sheet with high opening ratio constituted with solvent-free and heat fusion-type resin being fibrillated is used.

Description

[Detailed Description of the Invention] Industrial Application Fields The demand for arbor and deodorization in general households is becoming stronger year by year. Demand for removing cigarette odors and odors from beds and toilets is increasing in proportion to improvements in the airtightness of buildings and improvements in air conditioning efficiency.

The present invention relates to an air purifying filter for use in an air purifier based on such requirements.

BACKGROUND OF THE INVENTION Conventionally, this type of filter has been used by simply filling a flat or zigzag filter case with adsorbent particles. This method has drawbacks such as changes in the filling rate due to transportation and vibration, generation of fine powder and contamination, and changes in the flow path of the processing fluid, making it impossible to achieve the desired purification performance.

Furthermore, in order to compensate for these drawbacks, various filter processing methods have been proposed in recent years. That is, as shown in FIG. 6, the adsorbent 2 is directly sprayed on a thermoplastic resin nonwoven fabric 16 and bonded with heat to form a filter, or as shown in FIG. 7, a rubber-based, vinyl-based, or acrylic-based The adsorbent 2 is bonded to a nonwoven fabric, a three-dimensional mesh elastic sheet 16, etc. by selecting an adhesive such as the above adhesive.

Problems to be Solved by the Invention The former has drawbacks such as a weak bonding force between the adsorbent 2 and the nonwoven fabric 16, and the components attached to the adsorbent deteriorate due to heat during heating. Also, the fluid pressure drop was high. In the latter case, since adhesives are used, solvents and solutes can have a considerable effect on the adsorption capacity of the adsorbent, resulting in decreased adsorption capacity, uneven distribution of the adsorbent, or an increase in the amount of adsorbent used. It has drawbacks such as increased pressure loss and is not necessarily satisfactory in terms of performance and processing.

In view of these points, the present inventors have developed an air purifying filter that can be used as an air purification filter without impairing the adsorption performance of activated carbon, etc., and which has a low pressure drop when fluid (air) is passed through it even when a large amount of adsorbent is used. The present invention also aims to obtain an air purifying filter with excellent processability and economical efficiency.

Means for Solving the Problems Accordingly, the present invention is made by putting an adsorbent such as activated carbon into the cells of a honeycomb-like base material, and bonding nonwoven fabric to both sides with a web-like adhesive sheet.

Function: The filter with the above structure has extremely little influence of the adhesive on the adsorbent, etc., and even though it is uniformly distributed and uses a large amount of adsorbent, it has a low pressure drop and a low air purification rate. The present invention provides an air purifying filter with high and long service life.

Example Specific examples will be described below based on the drawings.

FIG. 1 is an overall view of the filter, and FIG. 2 is a partially enlarged view thereof. FIG. 3 is an enlarged view of the honeycomb-shaped base material.

The honeycomb-shaped base material 1, which serves as the filter base material, is made by bending aluminum thin plates, kraft paper, etc., joining them with adhesive, and then lightly curing them with phenolic resin etc. so as not to change the dimensions significantly. Then, the filter is cut into the vertical dimension W, the horizontal dimension W, and the thickness dimension C according to the size required for the filter dimensions.

The size of a cell is generally expressed as one dimension, and this one dimension and the C dimension largely control the adsorption performance of the filter.

In other words, the optimum dimensions are set based on the particle size of the adsorbent 2 such as activated carbon, the amount used, and the pressure drop.

In general, 8 dimensions are 2H to 16fl (12a was used in the example) and C dimensions are 3 to 20 fl (quantum, f5a'm
) is easy to use.

In the cells 6 of such a honeycomb-like base material 1, there are crushed activated carbon, granulated activated carbon, activated carbon impregnated with a chemical effective against odor components, activated clay, and zeolite.

An adsorbent 2 such as silica or alumina is uniformly filled. The particle size of the adsorbent 2 is determined based on the adsorption capacity,
Generally 4 mesh ~ 20 mesh (approximately 6aM
~1 tm) is used. In the example, 6 to 1
2 mesh (approximately 4 fl to 2 fl) of crushed charcoal was used.

One or more types of adsorbent may be selected, but
In the example, for aldehyde and ammonia.

We selected three types for hydrocarbons.

Next, the nonwoven fabric 3 is polyester or acrylic.

Fibrous (1d~
10d) A nonwoven fabric that retains some elasticity like cotton, and has a basis weight of 10 to 60 J/m.

Use one with a pressure loss of 16 Aq or less when the wind speed is 1 m/sec.

The adhesive sheet 4 for bonding the honeycomb-shaped base material 1 and the nonwoven fabric 3 is a nonwoven fabric made of solvent-free heat-sealing resin (nylon, acrylic, etc.) and having a high aperture ratio, that is, a spider web. Use a shaped adhesive sheet.

As a processing procedure, first, a honeycomb-shaped base material 1 and a nonwoven fabric 2 are bonded on one side only by hot pressing or the like using a spider web-shaped adhesive sheet 3, and then the adsorbent 2 is uniformly sprinkled thereon. By applying vibration and leveling with a brush, etc., the amount of adsorbent 2 to be used can be controlled extremely easily by adjusting the thickness C of the honeycomb.

Next, a spider web-like adhesive sheet 3 is placed on top of the web-like adhesive sheet 3, and a nonwoven fabric 3 is placed on top of this and heated with a hot press or the like to complete the filter A. The conditions for the hot breath are such that the spider web-like adhesive sheet 3 is fused, and the adsorbent 2 is
Set conditions where there is no change or deterioration of the components attached to the material.

(In the example, 130°C x 2 to 5 seconds) The air purifying filter A obtained in this way was
Used in the actual air purifier as shown in the figure. 6 is an air intake port, 7 is an air outlet, 8 is a control unit,
9 is a jig for setting the filter. FIG. 6 shows the internal structure of this air purifier viewed from above. Filter A for air purification is set using a jig 9 as shown in FIG. 1° is a pre-filter that removes large dust particles in the air, 111 is an electrostatic precipitator filter, 12 is a motor, 13
indicates a fan section, and 14 indicates an air flow path. 18 is a discharge electrode of an anode for generating high voltage for electrostatic precipitate, and 19 is a conductor such as a lath wire mesh set after filter A as a counter electrode.

Effects of the Invention The air purifying filter of the present invention obtained in this way allows a larger amount of adsorbent to be used per unit area than the conventional filter shown in FIGS. 6 and 7, and reduces pressure drop. A small filter can be obtained, and in addition, no solvent is used at all, and the degree of direct contact between the adhesive and the adsorbent is extremely small, so there is no reduction in adsorption performance.In addition, the honeycomb cells allow the entire surface to be covered. Uniform adsorption performance is achieved because the adsorbent does not shift to one side during vibration or movement. Table 1 shows an example of the effect.

As shown in Table 1, the effect of the product of the present invention is that there is no reduction in pressure loss and no effect of thermal adhesion as seen in Conventional Example 1, and there is no influence of solvent as seen in Conventional Example 2, and there is no effect on cigarettes. A product with excellent adsorption performance such as odor removal rate and lifespan was obtained. (In Conventional Example 2, the amount used was increased to 300I, but the thickness was too thick and could not be used in this case.)

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the basic configuration of the air purifying filter of the present invention, FIG. 2 is an enlarged view of section B in FIG. 1, FIG. 3 is a perspective view of the honeycomb-shaped base material, FIGS. FIG. 6 is a perspective view and a sectional view of an air purifier in which the air purifying filter of the present invention is used. FIG. 7 is a cross-sectional view of each conventional filter. DESCRIPTION OF SYMBOLS 1...Honeycomb-shaped base material, 2...Adsorbent, 3...Nonwoven fabric, 4...Spiderweb-shaped adhesive sheet, 6... ··cell. Name of agent: Patent attorney Toshio Nakao and 1 other person/
---Honey Kamui friend curtain 2- Adsorption sound 1 3- Lower range 1 4-< f) Next figure 5 Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure self

Claims (1)

[Claims] An air purifying filter made by putting an adsorbent such as activated carbon into the cells of a honeycomb-shaped base material, and bonding nonwoven fabric on both sides with a spider web-shaped adhesive sheet.