JPH05293321A - Air cleaning filter unit - Google Patents

Abstract

PURPOSE:To obtain the lightweight filter unit capable of being easily handled and capable of being incinerated after use by forming a resin-contg. surface layer on one side and over of a cardboard having specified thickness and density and over and forming a frame with a material having specified holding rate of bending strength and over before and after dipping in water. CONSTITUTION:A cardboard having >=0.5mm thickness and 0.7-1.4g/cm<3> density measured according to JIS-P8188 is used as the material for an air cleaning filter unit. A resin-contg. surface layer is formed on one side and over of the cardboard and held at 25 deg.C and 65% RH for 24hr to form a frame 4, and the bending moment of the frame lowered when dipped in distilled water for 1hr is controlled to >=40% of the bending moment of material measured according to JIS-P8125. Besides, >=80% of the filter medium 3 consists of an org. fiber aggregate.

Description

Detailed Description of the Invention

[0001]

The air cleaning filter unit of the present invention can be widely used in building air conditioners, total heat exchangers, air cleaning equipment and the like. Incidentally, the air cleaning filter unit here is to be attached to the above-mentioned equipment mainly for the purpose of removing dust contained in the air, and is a filter body in which a filter medium is incorporated in a frame member formed of cardboard. That is.

[0002]

2. Description of the Related Art As a conventional air cleaning filter unit, a glass fiber filter material, a non-woven filter material 1 and the like are fold-folded as shown in FIG. The resin 2 is applied thickly and is combined so as to maintain the gap between the folds as shown in FIG. 2 to form a filter medium 3 which is made of plywood, steel plate or the like as shown in FIG. The one assembled into the frame 4 made of an aluminum plate or the like is generally used. However, when the frame material made of plywood, steel plate, aluminum plate or the like as described above is used, there is a drawback that the entire filter unit becomes heavy and the handling property deteriorates. Especially when using a metal frame material can not be incinerated, for example, in the treatment after dismantling equipment and buildings using these, it can not be incinerated,
It becomes a large-scale industrial waste, which requires a considerable cost to dispose of it. Even if a frame material such as plywood that can be incinerated is used, the metal such as screws and nails used as the joining material is incinerated. However, there was still a weight problem, and there was room for improvement as a whole. Therefore, as a method for solving these problems, a frame material using various resins such as polyurethane has been proposed, but when a resin is used, a mold is required for molding the frame material, so that it is often used. It was not suitable for small-lot production of varieties, and it was a source of another problem of exhaust gas treatment during incineration.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and is lightweight, has excellent handleability, can be incinerated after use, and has a large problem of exhaust gas treatment. The present invention intends to provide an air cleaning filter unit that can be significantly reduced.

[0004]

The air-purifying filter of the present invention which has been able to solve the above-mentioned problems comprises a frame member formed of cardboard and a filter medium mounted in a space surrounded by the frame member. The air purifying filter unit according to claim 1, wherein the cardboard has a thickness of 0.5 mm or more, and
Measured density based on P8188 is 0.7-1.4 g / c
m ³ and a resin-containing surface layer was formed on at least one surface thereof, and the resin was further distilled at a bending moment value measured according to JIS P8125 after being kept at 25 ° C. and 65% RH for 24 hours. The bending moment retention rate when the bending moment value is lowered by immersing in water (20 ° C.) for 1 hour is 40% or more, and the filtering medium is 80% or more composed of an organic fiber aggregate. That is the summary.

[0005]

As a result of various studies on various suitable materials to replace the conventional metal frame material, it was found that it is preferable to use thick paper. However, ordinary cardboard and thick Kent paper do not have sufficient strength, and especially when the filter unit is used in an environment with high humidity, the strength of the frame material body decreases due to moisture absorption. Was difficult to maintain.
Therefore, as a result of examining various conditions required for the frame body, it was found that the paper material used should satisfy the following conditions. (1) Measured density based on JIS P8188 is 0.7 to
1.4 g / cm ³ , (2) Thickness is 0.5 mm or more, (3) A resin-containing surface layer is formed on at least one surface thereof, (4) 25 ° C., 65 % R
Bending moment after holding at H for 24 hours (JIS P
8125) must have a bending moment retention of 40% or more when it is immersed in distilled water (20 ° C.) for 1 hour to decrease the bending moment (JIS P8125).

[0006] As long as the above conditions are satisfied, it is lightweight and retains sufficient strength by itself, and is easy to handle. Moisture absorption is suppressed, and even if it absorbs moisture, its form can be maintained, and it can be stably used for a long period of time like metal products. Of course, after disposal, it can be incinerated, and the burden of exhaust gas treatment is small, so there is no problem. The pulp used as the material for the cardboard used in the present invention is not particularly limited.

The cardboard used in the present invention is not intended to be limited as long as it is a paper product satisfying the above conditions, but it does not have sufficient strength with ordinary ball paper or thick Kent paper, Moreover, when used in a severely humid environment, dew condensation occurs on the surface of the frame material, and moisture absorption accompanying this causes a sharp decrease in strength, making it difficult to maintain the form of the frame material.

As a result of various studies, the above (1)-
It has been found that if the frame material is formed using a paper material satisfying the condition (4), the above problems do not occur and all the objects of the present invention can be achieved. The conditions for each of the above materials will be described below.

First, the density was set to 0.7 to 1.4 g / cm ³ , but 0.8 to 1.3 g / cm ³ is more preferable. When the density is too low, it is difficult to maintain the strength as a frame material, and when the density is too high, there are difficulties in bending and the like. The thickness of cardboard is 0.5 mm or more,
It is preferably 1.0 mm or more. This is to ensure the strength required for the frame material.

The resin-containing surface layer is a resin-impregnated layer formed on the surface of a cardboard paper by impregnating the surface of the material paper (only one side or both sides if necessary) with a resin. The resins used here include acrylic resins, phenolic resins, silicone resins, polyolefin resins, polyurethane resins, epoxy resins, polyester resins, vinyl chloride resins, melamine resins, acetic acid. Non-exemplary examples include vinyl resins, polystyrene resins, and cellulose lacquers. By carrying out such a resin treatment, moisture absorption resistance is exhibited (for example, as shown in the examples below, the bending moment value during water absorption is 40% or more, preferably 50% or more, relative to the bending moment before water absorption. Can be retained), strength retention and improved dimensional stability are achieved.

The bending moment after being kept at 25 ° C. and 65% RH for 24 hours (the value measured according to JIS P8125) was lowered by dipping in distilled water (20 ° C.) for 1 hour. The value retention rate must be 40% or more (preferably 50% or more), and 50%
If it is less than 40%, especially less than 40%, there is a problem in that, under use under severe wet conditions, the strength is largely reduced by moisture absorption, and it cannot withstand actual use.

The bending moment value itself after being kept at 25 ° C. and 65% RH for 24 hours does not limit the present invention, but a rough guideline is that when used as a frame material. It is recommended to set the following according to the thickness and width. This is to ensure the mechanical strength when the frame body is assembled. For example: Thickness: 1.2 mm, 1000 gcm or more Thickness: 1.5 mm, 1300 gcm or more Thickness: 1.7 mm, 1500 gcm or more

A frame material made of a paper material satisfying the above conditions is provided with a pleated filter medium in the space portion, and 80% or more of the filter medium is composed of organic fibers. Aggregate is used. Needless to say, any binder can be used for assembling such organic fibers. In short, all the materials that have been used before can be used, but they must be made of combustible materials. It is permissible to add a small amount of inorganic substance.

As a method for obtaining the above high-density cardboard, it is recommended to employ a multi-ply method to reduce the amount of rice per square meter. Examples of the method of resin-treating the surface of the cardboard include a roll coater method, an air knife coater method, an impregnation treatment method, a size press treatment method, and a laminating method.

Further, by subjecting the cardboard and the filter material constituting the frame material to flame-retardant treatment (providing self-extinguishing property),
It exhibits a certain flame retardancy during use, while it can be incinerated after use. As a method of imparting such self-extinguishing property, a method of kneading or adhering a flame retardant such as a halogen compound, a phosphorus compound, or antimony trioxide when forming a resin-containing surface layer on a cardboard is possible. Can be adopted.

The present invention will be described in more detail with reference to the following examples, but the following examples do not limit the present invention.
All modifications and implementations are included in the technical scope of the present invention without departing from the spirit of the description below.

[0017]

【Example】

[Example 1] N-UKP (pulp raw material): 50 parts, L
-BKP (pulp raw material): 50 parts of paper stock, polyacrylamide-based paper strength agent: 0.5 parts and rosin-based sizing agent: 0.8
The cardboard base material obtained by mixing the parts was subjected to calendering treatment, and by changing the drying conditions, calendering pressure, etc., four types of cardboard (Comparative Examples 1 to 4) having different densities were obtained.

Acrylic resin [BF Color W-Dainippon Ink and Chemicals Co., Ltd.] was applied on both sides of the cardboard of Comparative Examples 1 to 4.
004] is applied by a roll coater so that the coating amount is 50 g / m ² , the density is different, and
Cardboard with resin-containing surface layers on both sides (Experimental Example 1
~ 4) was obtained. Further, a commercially available chip cardboard having a thickness of 1.4 mm (without forming the resin-containing surface layer) was used as Comparative Example 5.

Bending moments before and after immersion in water were measured for the thick papers (thickness: about 1.2 to 1.7 mm) of Experimental Examples 1 to 4 and Comparative Examples 1 to 5, and the retention rate of the bending moment was calculated. The results are shown in Table 1 together with the measured values of density. The density of thick paper was measured according to JIS P8188 "Testing method for thickness and density of paper and paperboard".

The bending strength retention rate before and after immersion in water was determined by first holding the thick paper at 20 ° C. and 65% RH for 24 hours, and then measuring the bending moment according to JIS P8125 “Test method for stiffness of paperboard by load bending method”. Is measured
Next, after immersing the cardboard in distilled water at 20 ° C. for 1 hour, the bending moment was measured again according to JIS P8125 “Test method for stiffness of paperboard by load bending method”, and the bending strength retention rate was calculated by the following formula. Bending strength retention rate [%] = (bending moment after immersion in distilled water at 20 ° C for 1 hour / bending moment after holding at 20 ° C and 65RH% for 24 hours)
× 100

[0021]

[Table 1]

From Table 1, the density is 0.7 to 1.4 g / cm.
³ , preferably in the range of 0.8 to 1.3 g / cm ³ and having a surface layer containing a resin, it can be seen that the bending moment retention rate before and after immersion in water can be increased.

Example 2 The thick papers of Experimental Example 3, Comparative Example 3 and Comparative Example 5 were bent into a U-shape shown in FIG. 4 to obtain Experimental Example 5, Comparative Example 6 and Comparative Example 7, respectively. The samples of Experimental Example 5, Comparative Example 6 and Comparative Example 7 were left standing for 24 hours under the conditions of 20 ° C. and 65% RH, and then subjected to a tensile test with the apparatus shown in FIG. The load was measured. After measuring the tensile load, Experimental Example 5, Comparative Example 6 and Comparative Example 7
The sample was immersed in distilled water at 20 ° C. for 1 hour, the tensile load when the amount of deflection reached 9 mm was measured by the same method, and the retention rate of the tensile load was calculated based on the following formula. The results are shown in Table 2. Tensile load retention rate [%] = (Tensile load [Kg] after immersion in distilled water at 20 ° C. for 1 hour / Tensile load at 20 ° C. and 65% RH [Kg]) × 100

[0024]

[Table 2]

From Table 2, Experimental Example 5 has almost the same density of cardboard as Comparative Example 6, and there is almost no difference in tensile strength at 20 ° C. and 65% RH, but tensile strength after immersion in distilled water for 1 hour The load retention rate was larger in Experimental Example 5, and the effect of forming the resin-containing surface layer on the cardboard was confirmed. When Experimental Example 5 is compared with Comparative Example 7, 2
It was confirmed that the tensile strength at 0 ° C. and 65% RH was high, and the retention rate of the tensile load after soaking in distilled water for 1 hour was also high. From these, it is understood that Experimental Example 5 is not only excellent in strength at ordinary temperature and humidity but also excellent in water resistance.

Example 3 Experimental Example 6 A polyolefin polymer filter medium was used as a filter medium, and after folding it into folds so that the fold width was 60 mm, hot melt was performed on the top of the folds so that the distance between the folds was 5 mm. The resin-coated filter medium was used to form a frame with the same paperboard as in Experimental Example 3 to obtain an air purifier filter unit having outer dimensions of 610 × 305 × 65 mm. Comparative Example 8 An air purifier filter unit was obtained in the same manner as in Example 1 except that a 1.6 mm thick bonder steel plate was used as the frame member. Table 3 shows the product weight, the weight after incineration, and the dimensions after incineration of the filter unit for an air purifier obtained as described above.

[0027]

[Table 3]

[0028]

EFFECTS OF THE INVENTION The present invention is constructed as described above, is lightweight and has excellent handleability, and exhibits excellent moisture resistance even in a severely used environment, so that it can be used in a wide range of environments. It can be used in various fields. Furthermore, it can be incinerated after use, and the burden of exhaust gas treatment is also reduced. Further, since the frame member used in the present invention is easy to process, it is possible to cope with low-cost production of a wide variety of products in small quantities.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a developed view of a filter medium.

FIG. 2 is a diagram showing an example of a side view of a filter medium.

FIG. 3 is a diagram showing an example of assembly of an air cleaning filter unit.

FIG. 4 is a view of a member having a U-shaped cross section (also a part of the frame member) used for the strength test.

FIG. 5 is a diagram showing a strength test method in Examples.

[Explanation of symbols]

 1 Filter medium 2 Hot melt resin 4 Frame member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Kamei 2-1-1 Katata, Otsu-shi, Shiga Toyobo Co., Ltd. Research Institute (72) Inventor Hiroyuki Koyanagi 2--2-8 Dojimahama, Kita-ku, Osaka Toyobo Co., Ltd. Head Office (72) Inventor Yoshihiro Saito 2-8, Higashishinmachi, Nagaoka, Niigata Prefecture Shinmei Apartment 201

Claims (1)

[Claims] 1. A filter unit for air cleaning, comprising a frame member formed of thick paper, and a filter medium mounted in a space surrounded by the frame member, wherein the thick paper has a thickness of 0.5 mm or more. In addition, the measured density according to JIS P8188 is 0.7 to 1.4 g / cm ³ , and a resin-containing surface layer is formed on at least one surface thereof, and further, at 25 ° C., 6
In contrast to the bending moment value measured based on JIS P8125 after being kept at 5% RH for 24 hours, the bending moment value was lowered by immersing this in distilled water (20 ° C.) for 1 hour. A filter unit for air cleaning, wherein the retention rate of moment is 40% or more, and the filter medium is composed of 80% or more of an organic fiber aggregate.