JPH07328350A - Protector for liquid filtration filter and its manufacture - Google Patents

Abstract

PURPOSE:To provide a protector for a liquid filtration filter of good filtration speed, in which a damage to the liquid filtration filter formed by friction is not generated and the high filtration efficiency can be maintained. CONSTITUTION:A protector 1 for a liquid filtration filter is composed of a columnar or polygonal pillar-shaped molded body formed by laminating at least two layers or more of paper or a nonwoven fabric base impregated with a phenolic resin solution and heat curing the phenolic resin, and openings 2 or cut channel sections are formed on the side face of the molded body in the protector 1 for the liquid filtration filter, and a manufacturing method for the above is also provided. Further a liquid filtration filter 3 is fixed on the inner side or the outer side of the protector 1 for the liquid filtration filter in a liquid filtration filter unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protector for a liquid filtration filter for efficiently removing particles contained in a liquid to obtain a clean liquid. More specifically, processing scraps contained in the working fluid of an electric discharge machine used for metal stamping, cutting, etc., and super-cutting used in processes such as cutting, polishing, and etching of substrate wafers in IC production. For filter material for efficiently removing processing dust contained in pure water to obtain a clean liquid, and filter material for efficiently fixing filter material for filtering various liquids such as automobile engine oil and fuel It concerns protectors.

[0002]

2. Description of the Related Art Conventionally, in a filter for liquid filtration, an engine oil for automobiles, fuel for various liquids such as fuels used in electric discharge machines and IC production processes, a mixed paper sheet of natural pulp and organic fiber and phenol are used. Sheets impregnated with resin, polyester non-woven fabric (spunbond)
However, there are problems such as low filtration efficiency and short life.

That is, a conventional filter medium has a function of capturing particles inside the filter medium, and uses a relatively coarse filter medium to extend the life, and until the particles enter the filter medium and fill the voids of the filter medium to some extent. The target filtration efficiency cannot be obtained. When the voids of the filter medium are filled, there is a problem that the pressure loss increases and the liquid permeability deteriorates to shorten the life, or the particles inside the filter medium flow out from the inside of the filter medium and the efficiency deteriorates.

Further, there is a porous sheet of fluororesin or the like as a high-performance filter, but it is expensive, so that it is limited to a special purpose and is not suitable as a filter medium for treating a large amount of liquid such as an electric discharge machine or an IC production process. Is.

As a method for solving these problems, a filter medium using fibrillated organic fibers has been developed (Japanese Patent Laid-Open No. 59-92011). However, when such a fiber is used alone to produce it by an ordinary wet papermaking method, the runoff from the wire is large,
Manufacturing problems such as wire clogging are unavoidable.

Even if a filter medium is obtained, the filter medium obtained is very dense due to the fine fibers, and as a result, although high filtration efficiency is obtained, it has high filtration resistance and is not suitable for practical use. When a monofilament fiber having a relatively large diameter is contained in an attempt to reduce the filtration resistance, the fine fibers are more likely to be washed away in the papermaking process, resulting in a significant decrease in filtration efficiency and insufficient performance.

In Japanese Patent Application Laid-Open No. 3-12208, an organic fiber fibrillated to have a fiber diameter of 1 μm or less, a fiber diameter of 1
By blending ultrafine organic fibers of ˜5 μm and organic fibers having a fiber diameter of 5 μm or more, aggregation of fibrillated organic fibers is suppressed, a homogeneous network is formed, and further calendering is applied to the surface of the filter medium. Improves smoothness and has a surface filtration mechanism.

Since this filter medium has a surface filtration mechanism,
The filtration performance and life are very good. However, since the thickness of the filter medium is very thin and there is no waist (hardness), it cannot be pleated. Furthermore, since the wet strength is very weak, when it is used in a filter for an electric discharge machine, a filter for an automobile engine oil, or a filter for an automobile fuel, it is broken by the pressure of the liquid.

Further, Japanese Patent Laid-Open Nos. 61-268321, 61-268325, 61-275495 and the like exemplify a filter medium having a two-layer structure with a density gradient. Balances filtration efficiency and life by combining two layers of filter media, and is basically different from the method of obtaining filtration performance on the filter media surface (filter media layer only).

A filter medium which solves the above-mentioned drawbacks and problems, has a low filtration resistance, a high filtration efficiency, a good fold processability, and a high wet strength is formed of an organic fiber having a specific shape and a fibrous organic material. With a filter medium using a binder and controlling the average void diameter, and an organic fiber having a fiber diameter of 7 μm or more,
At least one kind of synthetic fiber of polyolefin type, polyamide type, polyester type, acrylic type, vinylon type, and at least one of polyester type, polyolefin type, vinyl chloride vinyl acetate type fibrous organic binder
Contains 10 to 70% by weight and 30 to 150 g / m ²
It has been developed by combining a support having a grammage of 1 to a papermaking unit.

Originally, as a protector for a liquid filtration filter, a metal cylinder or a plastic cylinder having many holes on its side was used, and a folded filter medium was installed or fixed in the cylinder. There are the following problems in using the protector for a liquid filtration filter as described above for a high-efficiency filter medium.

That is, when the folded filter medium is not fixed in the protector for the liquid filtration filter, the filter medium moves in the cylinder due to the circulation of the liquid, the pressure fluctuation, and the vibration. Rubbing against the cylindrical wall and the opening of the protector for the liquid filtration filter,
The life of the liquid filtration filter was shortened.

The folded filter medium can be fixed in a cylinder with an adhesive or the like. However, in the filter medium obtained by combining organic fibers, shrinkage due to a dry / wet difference, a liquid pressure fluctuation, or a liquid temperature difference occurs. Since the degree of shrinkage is significantly different from the degree of shrinkage of a metal protector or a plastic protector, the folded filter medium is unnecessarily compressed, resulting in a reduction in filtration area and a reduction in filtration efficiency. There was a problem.

[0014]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to provide a protector for a liquid filtration filter, when fixing the liquid filtration filter to the protector, the same level of expansion / contraction as the liquid filtration filter. And the difference in shrinkage between the protector and the liquid filtration filter due to the difference in dryness / humidity, fluctuation in liquid pressure, or difference in liquid temperature is small, and even when the liquid filtration filter is not fixed to the protector, abrasion of the folds (EN) It is an object to provide a protector for a liquid filtration filter, which provides a high-performance liquid filtration filter unit having a short life and a long life.

[0015]

As a method for solving these problems, as a result of studying the application as a protector to various liquid filtration filters, a liquid filtration filter which can obtain excellent filter characteristics which has never been obtained. The inventors have found a protector for use and completed the present invention.

That is, the protector for a liquid filtration filter of the present invention is a columnar or polygonal columnar molded body in which at least two layers of paper or non-woven fabric substrate impregnated with phenol resin are laminated with an adhesive layer interposed. It is characterized by consisting of.

The molded body can be improved in filtration efficiency by providing an opening or a kerf on the side surface of the molded body.

Further, the liquid filtration filter unit of the present invention is characterized in that the liquid filtration filter is fixed and integrated inside or outside the protector for the liquid filtration filter.

In the method for producing a protector for a liquid filtration filter of the present invention, a substrate made of paper or nonwoven fabric is impregnated with a phenol resin and dried, and an adhesive is applied to at least one surface of the phenol resin-impregnated substrate. The phenol resin-impregnated base material is molded via the adhesive while laminating two or more layers on a cylindrical or polygonal columnar molded body, and a side surface of the molded body is provided with an opening or a kerf, and heat treatment is performed. Then, the adhesive and the phenol resin are dried and cured to be manufactured.

Further, in the method for producing a protector for a liquid filtration filter of the present invention, a substrate made of paper or non-woven fabric is impregnated with a phenol resin and dried, and an adhesive is applied to at least one surface of the phenol resin impregnated substrate. Then, two or more layers of the phenol resin-impregnated base material are laminated via the adhesive to form a laminated plate, and the laminated plate is molded into a cylindrical or polygonal molded body, and an opening is formed on the side surface of the molded body. Part or kerf, and heat treatment to dry and cure the adhesive and the phenolic resin.

Further, in the above-mentioned method for producing a protector for a liquid filtration filter, a step of introducing a phenol resin solution again after introducing an opening or a kerf into the side surface of the molded body is introduced and heat treatment is carried out. By drying and curing the adhesive and the phenol resin, the adhesive and the phenol resin can withstand continuous use for a long time.

The protector for a liquid filtration filter of the present invention will be described in detail below. The protector for a liquid filtration filter of the present invention comprises a thin and high-performance filter material having excellent surface filtration performance, and a support having good liquid permeability, high strength, and good fold folding property, which are integrated by papermaking. The resulting liquid filtration filter is a protector for a liquid filtration filter, which is installed or fixed in a protector for a liquid filtration filter having a similar degree of shrinkage to extend the life of a high-performance liquid filtration filter.

In the protector for a liquid filtration filter of the present invention, as a paper or non-woven fabric substrate impregnated with a phenolic resin, for example, a common natural wood pulp containing a softwood pulp, a hardwood pulp, and a mixed softwood pulp as a main component is used. Pulp paper, veneer base paper, titanium base paper, high-quality paper, coated paper, kraft paper, Kent paper, general-purpose paper mainly composed of wood pulp, such as pure white roll, or synthetic polymer fiber, depending on the application If possible, a non-woven fabric containing glass fiber as a main component, a synthetic paper, a laminated paper, or a composite material thereof may be used.

Regarding the thickness of the paper or non-woven fabric substrate,
Although not particularly limited, a base material having good folding resistance and tensile strength characteristics is preferable, and its basis weight is preferably 40 to 550 g / m ² .

Materials used for the paper or non-woven fabric substrate include, for example, dry pulp such as wood pulp, synthetic pulp, various polymer compounds, additives, fillers, starch derivatives, polyacrylamide, polyvinyl alcohol derivatives and gelatin. Enhancer, fatty acid salt, rosin derivative, size agent such as dialkyl ketene dimer emulsion, melamine resin, urea resin, wet paper strength enhancer such as epoxidized polyamide, stabilizer, pigment, dye, antioxidant, fluorescent whitening Agents, various latexes, inorganic electrolytes, pH adjusters and the like, and these can be used in an appropriate combination.

In the present invention, the phenolic resin used for impregnating a paper or a non-woven fabric substrate is a normal paper-
The phenol resin used for the phenol laminate can be used. In the present invention, cresol, xylenol, trimethylphenol, allylphenol, alkenylphenol, polyhydric phenol, polyphenol belonging to phenols such as polyphenols, the term phenol resin as a generic term for resins that cure by reacting with aldehydes such as formaldehyde. To use.

Examples of the phenol resin include a dry oil-modified phenol resin, a dry oil / aromatic hydrocarbon formaldehyde-modified phenol resin, a polybutadiene-modified phenol resin, an alkylphenol-modified phenol resin, and the like. Can be improved. The phenols that are the basis of the phenol resin can also be used without limitation, such as phenol, m-cresol, 3,5-xylenol, p-alkylphenol, and resorcin. These resins can be used as a phenol resin solution dissolved in a solvent such as alcohol, or as an aqueous emulsion, or as a water-soluble phenol resin (resole).

As a method of impregnating a paper or non-woven fabric substrate with a phenol resin, any method such as a usual dipping method, coating method, spraying method, size pressing method, tab size method or internal addition method can be used. You can When impregnating with a phenol resin, one or more phenol resins may be mixed or may be impregnated sequentially.
When the phenol resin is impregnated, the phenol resin is diluted with an organic solvent such as water, alcohol or toluene in order to control the depth of impregnation into the base material and the amount of adhesion, or a binder resin is used in combination. It doesn't matter.
In addition, it is possible to pre-cure a part of the phenol resin before using it with an adhesive for lamination.

The amount of the phenol resin impregnated into the paper or non-woven fabric substrate varies depending on the type of the substrate, but is 10 to 60% by weight. Here, when the impregnated amount of the phenol resin is less than this range, effective curing is not performed, and the fiber component of the paper or the non-woven fabric substrate may fall off during use, leading to a decrease in strength. If the amount of the phenol resin impregnated is more than this range, the strength before heat treatment decreases,
A good laminate may not be obtained in some cases.

In order to cure the phenolic resin, a crosslinking agent such as formaldehyde, a modifier such as aniline, an acid catalyst such as hydrochloric acid and oxalic acid, a basic catalyst such as ammonia and hexamethylenetetramine, and a curing agent are mixed and used. It doesn't matter.

The curing temperature and curing time of the phenol resin are 20 to 300 ° C. for 1 minute to 10 days, and more preferable curing conditions are 100 ° C. to 260 ° C.
It is about from minutes to 20 hours, and can be appropriately changed depending on the types of the base material and the phenol resin. The protector for a liquid filtration filter of the present invention has sufficient water resistance, oil resistance, pressure resistance, and strength due to the effect of the impregnated phenol resin, and can withstand continuous use for a long time.

In the protector for a liquid filtration filter of the present invention, the thickness of the laminated sheet of the phenol resin-impregnated base material is appropriately 1 to 20 mm, and more preferably 2 mm.
10 mm is suitable. If the thickness of the laminated plate is thinner than this range, the strength is not sufficient and it may be damaged during handling after use.If it is thicker than this range, the filtration resistance increases even with the same porosity. There are also problems in terms of cost.

In the protector for a liquid filtration filter of the present invention, the opening area or kerf provided on the side surface of the molded body has an opening area of 1 to 80% with respect to the area of the entire side surface.
It is more preferably 2 to 70%. If the opening area is smaller than this range, a sufficient flow rate cannot be obtained and the filtration resistance rises. Even if the opening area is larger than this range, there is no merit in the filter function, and the effect of strength reduction cannot be ignored.

The shape of the opening or kerf may be any shape such as a circle, an ellipse, a rectangle, a rectangle, a rhombus, and an irregular shape. Further, the strength of the opening can be improved by impregnating or coating the phenol resin again after providing the opening or the kerf.

In the liquid filtration filter unit of the present invention, the liquid filtration filter is fixed to and integrated with the protector for the liquid filtration filter. The liquid filtration filter can be improved in filtration efficiency by using the liquid filtration filter in a state where the surface area is increased by folding it. The liquid filtration filter is used by being installed or fixed inside or outside the protector for the liquid filtration filter. The fold-folded liquid filtration filter and the liquid filtration filter protector may be adhered to the protector at the ridge portion. Alternatively, for example, a liquid filtration filter may be installed outside the cylindrical protector, and both may be bonded together with a holding plate attached to the upper and lower parts thereof. Furthermore, without adhering the protector for liquid filter and the liquid filter,
It is also possible to use it with easy removal.

The protector for a liquid filtration filter of the present invention has a wet swelling property, a pressure swelling property and a temperature swelling property comparable to those of the liquid filtration filter to be housed, as compared with the conventionally used metal protector or plastic protector. Since it has, a gap is created between the liquid filtration filter and the protector for the liquid filtration filter due to changes in dryness, pressure, temperature, or the like, or the liquid filtration filter is compressed to form an unnecessary tarmi portion and overlap with each other, resulting in a surface area. It never decreases. Therefore, it has a feature that good filtration characteristics are maintained under any conditions. Further, since there is no extreme difference in hardness between the liquid filtration filter and the protector, even if the liquid filtration filter moves within the protector due to pressure fluctuations, etc., the liquid filtration filter is rubbed against the protector. Less likely to deteriorate. As a result, it is possible to improve the life of the liquid filtration filter unit when there is a fluctuation in the delivery pressure of the filtrate.

In the present invention, as an adhesive used for laminating and molding a paper or non-woven fabric substrate impregnated with a phenol resin, for example, a curable vinyl acetate resin, a curable vinyl emulsion resin, a curable acrylic resin is used. The acid ester copolymer resin, modified acrylic copolymer resin, epoxy resin, reactive hot melt resin and the like can be used alone or in combination. The use of a curing agent to cure the adhesive does not matter. The amount of the adhesive applied varies depending on the type of the base material, but the dry solid content per layer is 5 to 5
0 g / m ² is suitable.

In order to obtain the protector for a liquid filtration filter of the present invention, a method of molding a paper or non-woven fabric substrate impregnated with a phenol resin is carried out by applying an adhesive to the ribbon-shaped substrate and forming a spiral in multiple layers. A method of winding, a method of winding the base material in a cylindrical shape many times while applying an adhesive, a semicircle (for example, a shape like a rain gutter) or a quadrant to a flat plate having the base material applied with an adhesive Any method such as a method of performing embossing and combining them into a columnar shape may be used. As a matter of course, the effect of the present invention is not impaired even if the shape of the molded body is not only a cylindrical shape but also a polygonal pillar shape such as a square pillar shape.

The filter material for liquid filtration filters housed in the protector for liquid filtration filters of the present invention will be described below.

The filter material for a liquid filtration filter used in the present invention comprises a thin and high-performance filter material having excellent surface filtration performance, and a support having good liquid permeability, high strength and good fold foldability. It is preferable to use a liquid filtration filter that is integrated together, and particularly when such a high-efficiency filter medium is used, the effect of the protector for a liquid filtration filter of the present invention is easily obtained.

For example, a liquid filter having the following structure is used. As the filter material, 5 to 40% by weight of organic fibers fibrillated to have a fiber diameter of 1 μm or less, 5 to 70% by weight of ultrafine organic fibers having a fiber diameter of 1 to 5 μm, and 20 to 70% by weight of organic fibers having a fiber diameter of 5 μm or more % Of organic fibers, a fibrous organic binder is used for a part or all of the above organic fibers, and has an average void diameter of 1 to 10 μm and a basis weight of 5 to 50 g / m ^2. .

The support is an organic fiber having a fiber diameter of 7 μm or more, and is made of at least one kind of polyolefin-based, polyamide-based, polyester-based, acrylic-based, and vinylon-based synthetic fibers. Containing 10 to 70% by weight of at least one kind of vinyl chloride vinyl acetate type fibrous organic binder, and
It has a basis weight of ˜150 g / m ² .

Liquid filtration obtained by combining a thin and high-performance filter material having excellent surface filtration performance with a support having good liquid permeability, high strength, and good fold folding property, and integrating them. A filter is preferably used.

[0044]

[Operation] In immobilization of high efficiency liquid filtration filter,
The protector for a liquid filtration filter of the present invention which accommodates this is formed by laminating a paper or non-woven fabric base material impregnated with a phenol resin via an adhesive layer, molding, and heat treating to cure the phenol resin. It consists of a columnar or polygonal columnar molded body. The protector may have a gap between the liquid filtration filter and the protector due to changes in dryness, pressure, temperature, or the like, or the liquid filtration filter may be compressed to form an unnecessary tarmi portion and overlap with each other to reduce the surface area. It is possible to exhibit good filtration characteristics.
Although it is considered from the viewpoint of hardness of the material, deterioration of the liquid filtration filter due to friction with the protector due to pressure fluctuation or the like is less likely to occur, and the life of the liquid filtration filter unit can be improved.

[0045]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Preliminary Operation 1 (Preparation of Liquid Filter 1) 15 parts of Kevlar fine fiber (Tiara 400S, manufactured by Daicel Chemical Co., Ltd.), ultrafine polyester fiber (manufactured by Asahi Kasei Corporation,
0.1 denier x 3 mm, diameter about 3 μm) and polyester fiber (manufactured by Teijin Ltd., 0.5 denier x 5 mm, diameter about 7)
40 parts of a mixture with 40 μm), heat-bonding (core-sheath type) polyester fiber (Unitika 4080, 2 denier x 5)
45 parts by weight (mm, diameter: about 15 μm) were mixed to prepare an aqueous slurry, and a filter material having a basis weight of 20 g / m ² was formed from these slurries using a standard square handmade paper machine.

20 parts of polyester fiber (manufactured by Teijin Ltd., 0.5 denier × 5 mm, diameter about 7 μm), vinylon fiber (manufactured by Kuraray Co., Ltd., 1 denier × 6 mm, diameter about 10 μm)
30 parts, heat-adhesive (core-sheath type) polyester fiber (Unitika 4080, 2 denier x 5 mm, diameter about 15)
μm) 50 parts to prepare an aqueous slurry, and the basis weight is 80% from these slurries using a standard square handmade paper machine.
A support of g / m ² was formed.

The filter material in the form of a wet paper and the support were made into a sheet and integrated, and then pressed and dried to obtain a sheet. Thereafter, an anionic acrylic latex to be 5 g / m ² on this sheet (Nippon acrylic Co., primers Le HA-
16) was impregnated with a size press and dried with an air dryer to obtain a liquid filtration filter 1.

Preliminary Operation 2 (Liquid Filtration Filter 2) Commercially available element for liquid filtration filter OA-800E
Liquid filter 2 (made by Awa Paper Co., Ltd .; single layer structure)
Used as.

Example 1 As a base material for a protector for a liquid filtration filter, a kraft paper having a basis weight of 300 g / m ² was coated with a phenol resin (Sumilite Resin PR manufactured by Sumitomo Dures Co., Ltd.) by a dipping method.
-51464) was impregnated so that the solid content was 20% and dried to obtain a phenol resin-impregnated base material. An adhesive (Kanebo-NSC Co., Ltd., Durolock 142-2150, containing 1% by weight of curing agent catalyst 142-2301) on one surface of the phenol resin-impregnated base material 40 g / m ²
Was applied in an application amount of, and five layers were laminated in a columnar shape. On the side surface of the obtained cylindrical molded body, punch 6 mm
Open φ holes corresponding to 5% of the total area, then 1
The phenol resin was cured by heat treatment at 80 ° C. for 30 minutes to obtain the desired protector for liquid filtration filter. Apply adhesive to a part of the ridges of the liquid filter 1 or the liquid filter 2 that has been fold-folded,
It was placed in the protector and adhered to obtain a liquid filtration filter unit.

Example 2 As a base material for a protector for a liquid filtration filter, 50% of NBKP having a basis weight of 200 g / m ² and an organic binder fiber 5 were used.
A non-woven fabric consisting of 0% was mixed with a phenol resin alcohol solution (Sumilite Resin PR-5008 manufactured by Sumitomo Dures Co., Ltd.
7) was impregnated so that the solid content was 40% and dried to obtain a phenol resin-impregnated base material. A phenol resin-impregnated base material was slit into a ribbon shape, and an adhesive agent (manufactured by Konishi Co., Ltd., Bond CE500) was applied to one surface of the slit material in a coating amount of 30 g / m ² , and nine sheets were stacked and laminated in a spiral shape. . 8 mm by pressing on the side surface of the obtained cylindrical molded body.
By opening φ holes corresponding to 20% of the total side area, immersing the phenol resin again in the bath of the phenol resin to adhere the phenol resin, and after heat treatment at 160 ° C. for 2 hours, the phenol resin is removed. After curing, a desired protector for a liquid filtration filter was obtained. The fold-folded liquid filtration filter 1 or liquid filtration filter 2 was directly installed in the protector to obtain a liquid filtration filter unit.

Example 3 As a base material for a protector for a liquid filtration filter, a kraft paper having a basis weight of 150 g / m ² was coated with a phenol resin (Sumilite Resin PR manufactured by Sumitomo Dures Co., Ltd.) by a dipping method.
-50781) was impregnated to a solid content of 30% and dried to obtain a phenol resin-impregnated base material. An adhesive (Kanebo-NSC Co., Ltd., Durolock 142-2150, containing 1% by weight of curing agent catalyst 142-2301) on one surface of the phenol resin-impregnated base material 30 g / m ²
The coating amount was applied, 10 sheets were stacked without drying, placed in a semi-circular mold, and hot pressed at 200 ° C. for 20 minutes to obtain a semi-circular molded body. A 10 mmφ hole was opened in the semi-circular molded body by pressing so as to correspond to 50% of the total side area, and two semi-circular shapes were combined with an adhesive to form a cylindrical molded body. The obtained columnar molded body was heat-treated at 180 ° C. for 1 hour to cure the phenol resin and obtain a desired protector for a liquid filtration filter. Liquid filter 1 with folds
Alternatively, an adhesive was applied to a part of the ridges of the liquid filtration filter 2, placed in a protector and adhered to obtain a liquid filtration filter unit.

Comparative Example 1 As a protector for a liquid filtration filter, a thickness of 2 mm
A 10 mmφ hole was formed in the stainless steel plate of No. 1 by 50% of the total side area, and after bending into a columnar shape, it was adhered by welding to obtain the protector. An adhesive was applied to a part of the ridges of the fold-folded liquid filtration filter 1 or the liquid filtration filter 2, and the adhesive was placed in the protector and adhered to obtain a liquid filtration filter unit.

Comparative Example 2 As a protector for a liquid filtration filter, a thickness of 2 mm
A 10 mmφ hole was formed in the stainless steel plate of No. 1 by 50% of the total side area, and after bending into a columnar shape, it was adhered by welding to obtain the protector. The fold-folded liquid filtration filter 1 or liquid filtration filter 2 was directly installed in the protector to obtain a liquid filtration filter unit.

Comparative Example 3 As a protector for a liquid filtration filter, a thickness of 2 mm
A cylindrical acrylic plate with a 10 mmφ hole on all sides
The protector was obtained by opening holes corresponding to the percentage. An adhesive was applied to a part of the ridges of the fold-folded liquid filtration filter 1 or the liquid filtration filter 2, and the adhesive was placed in the protector and adhered to obtain a liquid filtration filter unit.

Comparative Example 4 As a protector for a liquid filtration filter, a thickness of 2 mm
A cylindrical acrylic plate with a 10 mmφ hole on all sides
The protector was obtained by opening holes corresponding to the percentage. The fold-folded liquid filtration filter 1 or liquid filtration filter 2 was directly installed in the protector to obtain a liquid filtration filter unit.

[Test] For the measurement of filtration efficiency and filtration speed, JIS Type 8 powder diluted with water to a concentration of 0.05% was used as a test liquid and measured by the following methods. .

1. Filtration efficiency After wetting the filter medium with water, 20 liters of the test liquid was filtered 10 times by periodically changing the filtration area to 1 m ² and the differential pressure to ΔP = 50 to 420 mmHg. 10μ
The number of m particles is measured by the liquid particle counter (KL-
It was measured in 01). The unit of filtration efficiency is (%).

2. Filtration rate The filtration rate was obtained from the filtration time during the above-mentioned filtration performance test. The unit of filtration rate is (cc / cm ² · min).

[0060]

[Table 1]

As shown in Examples 1 to 3 in Table 1 above, the liquid filtration filter unit using the protector for a liquid filtration filter of the present invention has a filtration efficiency and a filtration rate even when the filtrate pressure varies. Is good. In particular, when the liquid filtration filter 1 which is a high efficiency filter is used, the effect is remarkable. On the other hand, as seen in Comparative Examples 1 to 4, in the case of using the metal protector or the plastic protector, the filtration efficiency or the filtration speed is inferior even if the same liquid filtration filter is used. This is because the liquid filtration filter is unnecessarily compressed and the substantial filtration area is reduced, resulting in a decrease in filtration speed, or the friction between the liquid filtration filter and the protector causing damage to the liquid filtration filter, resulting in filtration efficiency. It is thought that this will lead to a decrease in

[0062]

The protector for a liquid filtration filter of the present invention can be expanded and contracted to the same extent as the liquid filtration filter, so that the filtration speed is good and the liquid filtration filter is not damaged by friction. High filtration efficiency can be maintained over a period of time.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a liquid permeation filter is housed inside a hexagonal column-shaped liquid permeation filter protector.

FIG. 2 is a perspective view showing a state in which the liquid permeation filter is housed outside a hexagonal column-shaped liquid permeation filter protector.

[Explanation of symbols]

 1 Protector for Liquid Filtration Filter 2 Opening Portion 3 Liquid Filtration Filter 4 Liquid Permeation Filter Unit

Claims (7)

[Claims] 1. A protector for a liquid filtration filter comprising a columnar or polygonal columnar molded body in which at least two layers of paper or a non-woven fabric substrate impregnated with a phenol resin are laminated with an adhesive layer interposed therebetween. 2. The protector for a liquid filtration filter according to claim 1, wherein the molded body is provided with an opening portion or a cut groove portion on a side surface of the molded body. 3. A liquid filtration filter unit in which a liquid filtration filter is fixed inside or outside the protector for a liquid filtration filter according to claim 1. 4. A method for producing a protector for a liquid filtration filter, wherein a substrate made of paper or non-woven fabric is impregnated with a phenol resin and dried, and an adhesive is applied to at least one surface of the phenol resin impregnated substrate, The phenol resin-impregnated base material is molded through an adhesive while laminating two or more layers on a columnar or polygonal columnar molded body, and a side surface of the molded body is provided with an opening or a kerf and heat-treated. A method for producing a protector for a liquid filtration filter, which comprises producing the adhesive and the phenol resin by drying and curing. 5. A method for producing a molded product by forming an opening or a kerf on the side surface of the molded product, impregnating it with a phenol resin solution again, and heat-treating it to dry and cure the adhesive and the phenol resin. The method for producing a protector for a liquid filtration filter according to claim 4, which is characterized in that. 6. A method for producing a protector for a liquid filtration filter, wherein a substrate made of paper or a nonwoven fabric is impregnated with a phenol resin and dried, and an adhesive is applied to at least one surface of the phenol resin impregnated substrate, Two or more layers of the phenol resin-impregnated base material are laminated via an adhesive to form a laminated plate, and the laminated plate is molded into a cylindrical or polygonal molded body,
A method for producing a protector for a liquid filtration filter, characterized in that an opening portion or a kerf portion is formed on a side surface of the molded body, and heat treatment is performed to dry and cure the adhesive and the phenol resin. 7. A method in which a molded body is provided with an opening portion or a kerf portion, then impregnated with a phenol resin solution again, and heat-treated to dry and cure the adhesive and the phenol resin to produce the adhesive. 7. The method for producing a protector for a liquid filtration filter according to claim 6.