JPH07227513A - Air filter - Google Patents

Abstract

PURPOSE:To easily exchange a filter on an appliance, to easily burn it and reduce the burnt volume and to easily prevent leakage of dust-containing air from an opening between the appliance main body and the filter. CONSTITUTION:An outer peripheral side face of a filter medium 1 is surrounded with a frame 2 and also fixed with an adhesive 3 to form the air filter 8. An electret processing is performed at least on the outer peripheral side face of the frame 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter used in a building air conditioner, a home air cleaner, etc. More specifically, the filter can be easily replaced and incinerated and reduced in volume, and can be attached to a device body for sealing. It is related to the filter which raised.

[0002]

2. Description of the Related Art Conventionally, an air filter installed in a building air conditioner, a small air cleaner, or the like (hereinafter referred to as a device body) prevents leakage of air between the device body and the air filter when replacing the filter. Therefore, it is attached to a filter housing or the like of the main body of the device via a foam sheet packing having closed cells inside, a rubber packing, or the like. In addition, the frame material is made of metal, wood, synthetic resin, etc. having high rigidity and good dimensional stability so that the packing can be compressed and adhered to the device body. It is generally integrated in.

However, in the above-mentioned conventional air filter, it is difficult to separate both members from each other because the frame and the filter medium are usually made of different materials at the time of discarding and burying. In addition, the frame needs to be strong and have precise dimensions, which increases material cost and weight. Furthermore, when fixing the filter to the device body, there were many problems such as special knowledge and technology required for replacement, such as crimping with a screw or a spring so that the packing comes into close contact with the device body.

In order to solve these problems, for example, in Japanese Utility Model Publication No. 4-14095, the problem of increase in material cost and weight is solved by forming the frame with a non-woven fabric having a coarse and dense two-layer structure having elasticity in the thickness direction. In addition, without a packing, a frame and a filter housing are fitted and sealed to facilitate replacement, or like a filter disclosed in Japanese Patent Laid-Open No. 5-103936. By forming a non-woven fabric in which fibers are partially thermocompression-bonded and impregnated with a synthetic resin,
There is known one that solves the problem of insufficient frame strength disclosed in Japanese Utility Model Publication No. 4-14095.

However, in these conventional filters, even if the frame material is the non-woven fabric frame, air leakage from the gap between the outer periphery of the frame formed when the filter is attached and the device body cannot be avoided. In order to avoid air leakage with a filter made of such a frame material, it is necessary to increase the rigidity of the frame material to prevent deformation, and to strictly control the external dimensions of the filter, thus increasing costs and making assembly difficult. Was a factor.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional filter, facilitates replacement of the filter with the device body and incineration and volume reduction, and includes dust and the like between the device body and the filter. An object is to provide an air filter that can easily prevent air from leaking.

[0007]

An air filter according to the present invention is an air filter in which a filter medium is fixed to an inner peripheral surface of a frame surrounding an outer peripheral side surface of the filter medium with an adhesive,
At least an outer peripheral side surface of the frame is subjected to electret processing.

In this case, it is preferable that a part or all of the frame is made of a fibrous sheet or film that has been subjected to electret processing. The frame is composed of two or more layers of a core material and a fibrous sheet or film, and at least the outer peripheral surface of the frame is provided with an electret-processed fibrous sheet or film. May be.

Here, the material of the filter medium is not particularly limited, and examples thereof include synthetic resins such as polyolefin, polyester, polycarbonate and polyamide, and synthetic resins such as polyfluorine type, acrylic type and vinyl chloride type. Alternatively, a glass sheet or the like formed on a fibrous sheet is preferable. As the form of these fibrous sheets, for example, non-woven fabric, knitted fabric, paper-like material and the like are suitable. Further, a part or all of the filter material having such a material or form may be subjected to electret processing which will be described later, or may be used by appropriately bonding other various filter materials in order to obtain a desired filtering performance. Alternatively, in order to increase the area of the filter medium, a filter medium bent in a corrugated form may be used. As the material of the frame, various kinds of synthetic resins that can be electret processed, preferably synthetic resins having an electric insulating property of 10 ¹³ Ω · cm or more are used. Such a material is preferably a synthetic resin such as polyolefin, polyester, polycarbonate, or polyamide, or a polyfluorine-based, acrylic-based, or vinyl chloride-based synthetic resin. Among them, the polyolefin-based resin is preferable because of the stabilization of electret performance. A synthetic resin is more preferable, and a polypropylene-based synthetic resin is particularly preferable. A fibrous sheet or film is formed by using such a material. The electret processing applied to this frame is a processing method disclosed in, for example, Japanese Patent Application Laid-Open No. 61-186568, and various known electret methods such as thermal electret method, electro-electret method, and radio. This is a processing method in which a sheet or the like is charged by applying an electret method, a mechano-electret method, or the like. Further, in the case of forming into a fibrous sheet or film, it is more preferable to use a low-density and high-bulk non-woven fabric having a thickness of 1 mm or more in order to improve the dust capturing performance, because the adhesion between the frame and the filter housing is increased. In addition, carrying, mounting,
In order to obtain a frame rigidity that allows the shape of the device to be retained when used in the device body, a core material and a plurality of electretized sheets may be laminated and bonded together. In this case, it is necessary to dispose the electretized sheet on at least the outer peripheral surface of the frame. For the core material, for example, cardboard, synthetic resin non-woven fabric, synthetic resin film, or the like is appropriately selected so that the required frame rigidity can be obtained and the incineration process is easy.

As an adhesive, carry the filter,
It suffices that the adhesive strength is such that the shape can be maintained during mounting and use, and it is preferable to use a hot-melt adhesive, an emulsion adhesive, or a reactive adhesive. Also,
As an adhesion means other than the adhesive, a double-sided adhesive tape, a heat fusion method or the like may be used.

[0011]

According to the air filter of the present invention according to claims 1, 2, and 3, since at least the outer peripheral surface of the frame is electretized, the dust in the fluid supplied to the equipment body such as the air conditioner is Not only does it collide with the frame and be collected, but it is more strongly attracted to the outer peripheral surface of the frame by Coulomb force. As a result, even if there is a slight gap between the outer peripheral surface of the filter and the filter housing of the device body, dust will not be adsorbed on the frame and leak to the downstream side of the filter.

According to the air filter of the fourth aspect of the present invention, the frame material can be incinerated, and the volume of incineration waste can be easily reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an air filter 8 according to the present invention, showing a state in which it is mounted on a filter housing 7 of a device body such as an air conditioner.

In the figure, 1 is a filter medium bent in a corrugated shape, 2 is a frame for fixing the outer peripheral side surface of the filter medium 1 in a close contact state,
Reference numeral 3 represents an adhesive agent for bonding both members. The arrow direction indicates the flow direction of air.

FIG. 2 is a partially enlarged view of the frame 2 of FIG.

In this embodiment, each of the filter media 1 was manufactured by the melt-blowing method, and two non-woven fabrics that had been electret-processed in advance, that is, a basis weight of 80 g / m ² , a thickness of 0.6 mm and an average fineness of 0. 8d polypropylene non-woven fabric, unit weight is 50g / m ² , thickness 0.4mm,
A polypropylene non-woven fabric having an average fineness of 0.04d is laminated and ultrasonically bonded to be integrated.

The frame 2 is formed by adhering a core material 4 and an electretized sheet 5 with a hot melt adhesive 6, and the core material 4 is a water-repellent thick paper having a thickness of 1 mm. Electretized sheet 5 has a basis weight of 200 g / m
^2. A spunbonded nonwoven fabric made of polypropylene having a thickness of 2.0 mm and an average fineness of 5 d, which has been subjected to electret processing.

The adhesive 3 for adhering and fixing the filter medium 1 and the frame 2 is a polyolefin-based hot melt adhesive.

Then, after the filter medium 1 and the frame 2 are cut into a predetermined size, the filter medium 1 is bent into a corrugated shape having a fold height of 15 mm, and an adhesive agent is applied to the frame 2 so that the fold spacing becomes about 6 mm. By fixing at 3, the external dimensions are 210m long
The air filter 8 of the present invention having m, width 150, and depth 15 mm was obtained.

[0021]

[Comparative Example] For comparison, an air filter was manufactured by using a frame that had not been subjected to electret processing and using the other conditions as in Example.

The filters of these Examples and the filters of Comparative Examples were mounted on an air purifier, and the measured air volume was 40 m.
Collection efficiency at ³ / h (collection efficiency = number of particles collected by filter /
The number of inflowing particles) and the initial pressure drop of the filter were measured. The collection efficiency was measured and calculated with a particle counter (model KC-01B) manufactured by Rion Co., Ltd., targeting atmospheric dust having a particle size of 0.3 to 0.5 μm.

Table 1 below summarizes these results.

[0024]

[Table 1] As shown in Table 1, it was found that the air filter 8 of the present invention showed less dust leakage to the downstream side and higher collection efficiency than that of the comparative example. Also, it was very easy to install it in an air purifier.

[0025]

EFFECTS OF THE INVENTION The air filter of the present invention according to claims 1, 2, and 3 is provisionally provided with an electret process on at least the outer peripheral side surface of the frame which is a contact surface with a filter housing of an air conditioner or the like. Even if there is a gap between the outer peripheral surface of the frame and the outer peripheral side surface of the frame, the outer peripheral surface of the frame adsorbs dust in the fluid due to the Coulomb force. Therefore, in the air filter of the present invention, dust does not leak to the downstream side of the filter. As a result, it is not necessary to pay attention to the fitting accuracy of the air conditioner and the filter, and it is not necessary to increase the dimensional accuracy of the frame. In addition, the accuracy of the work is not required when mounting or replacing the filter.

In the air filter of the present invention according to claim 4, since the frame material is made of synthetic resin, it can be incinerated and the volume of incinerated waste can be easily reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an air filter according to the present invention.

FIG. 2 is a partially enlarged view of the frame of the air filter of FIG.

[Explanation of symbols]

 1: Filter material 2: Frame 3: Adhesive 4: Core material 5: Electretized sheet 6: Hot melt adhesive 7: Filter housing 8: Air filter

Claims (4)

[Claims] 1. An air filter in which a filter medium is fixed to an inner peripheral surface of a frame surrounding an outer peripheral side surface of the filter medium with an adhesive, wherein at least the outer peripheral side surface of the frame is subjected to electret processing. A characteristic air filter. 2. The air filter according to claim 1, wherein a part or all of the frame is made of a fibrous sheet or film which has been subjected to electret processing. 3. The frame comprises two or more layers of a core material and a fibrous sheet or film, and at least the outer peripheral surface of the frame is provided with an electret-processed fibrous sheet or film. The air filter according to claim 1, wherein: 4. The air filter according to claim 1, wherein the electret-treated portion of the frame is formed of polyolefin, polyester, polycarbonate, polyamide, polyfluorine, acrylic or vinyl chloride synthetic resin.