JPS63218227A - Filter medium - Google Patents

Abstract

PURPOSE:To improve processibility and to increase mechanical strength, heat- resistivity, cold-resistivity and durability, by forming the filter medium with plate-shaped laminating body of metallic fiber nonwoven cloth and expanded metal which is sealed at the peripheral part. CONSTITUTION:The expanded metals 1 are laminated on both surfaces of the metallic fiber nonwoven cloth 2 (Fig. 1c), which are, in case of necessity, pressed or rolled with 300-2,000kg/cm<2>, and are preferably punched into disks as shown in Fig. 1a. then, the peripheries of aluminum fiber and aluminum expanded metal are press-jointed as shown in Fig. 1b lest the periphery of the disk should peel off, and a sealing part 4 is formed to obtain the filter medium 5. This filter medium 5 is used as an oil separator or as a filter for filtrating air or gas.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a metal porous filter material, and in particular to a filter that has good filtration performance, air permeability, high bending strength, light weight, and high structural strength. Regarding materials.

<Prior Art> Various materials have been used as filter materials for engine exhaust holes and indoor ventilation holes. These can be broadly classified into those belonging to cloth or carbon fiber systems, and those belonging to sinter systems such as sintered metals and ceramics.

However, cloth, carbon, etc. lack rigidity. Sintered metals, ceramics, etc. have the problem of large variations in porosity and poor plasticity.

The necessary conditions for a filter material are: (i) It must have sufficient corrosion resistance and impact resistance; (if) it can easily return to its original permeability by blowing against the wind, washing with water or brushing; (iii) it cannot be filtered through. (iv) It has sufficient strength; (V) It can be processed into disks, cylinders, etc. at low cost; Ceramic filters have poor impact resistance, filament filters have poor filter shape retention, and sintered metal filters have difficulty adjusting the pores to a desired level.

(Objective of the Invention) The first object of the present invention is to provide a filter material that is easy to process and has mechanical strength, heat and cold resistance, and durability. The present invention aims to provide a filter material that is mechanically strong, heat resistant, cold resistant, and durable, and can strictly control the desired pore size necessary for liquid diffusion.

<Structure of the Invention> A first aspect of the present invention provides a filter material characterized in that the periphery of a plate-like laminate of a metal fiber nonwoven fabric and an X-band metal is sealed.

A second aspect of the present invention provides a filter material characterized in that the periphery of a plate-like laminate of a metal fiber nonwoven fabric, an exband metal, and a net of a predetermined mesh size is sealed.

Here, the metal fiber nonwoven fabric is a metal fiber nonwoven fabric mainly made of metal AJ2, and the Xband metal is
Preferably, it is an exband metal mainly composed of metal AJ2.

Further, it is preferable that the net body is made of stainless steel or carbon fiber.

The present invention will be explained in detail below.

First, the metal fiber nonwoven fabric, the X-band metal, and the predetermined mesh net used in the present invention will be explained.

The metal fiber nonwoven fabric is a cloth-like body made of metal fibers such as AJZ, stainless steel, copper, etc. formed into layers.

Metal fiber refers to metal in the form of fibers, with a cross section of any shape such as triangular or circular, and an effective diameter of approximately 20 to 200 μm.
m, a general term for metal strips with a length of 1 to 20 cm.

Examples of methods for producing metal fibers include 1) a machine processing method by wire drawing, and 2) a method of spinning from molten metal.

Any metal may be used as the metal material, and is used depending on the purpose of the filter material. Metal fibers made of metals such as Ni1An, stainless steel, and alloys thereof are used.

In particular, molten Al mainly composed of metal AJZ is used as a metal fiber.
When using AJ2 series metal fibers spun from AJ2 series metals, the metal fibers are thin and flexible, and have good interlocking with the X-band metal described below, which prevents small pieces of metal from falling off during bending, etc., and is environmentally hygienic. is also safe.

Exband metal, also commonly called lath net, is a thin metal plate with many cuts made and the cuts pulled in a substantially perpendicular direction to form a net-like shape. Since X-Band Metal is not made of fine metal wires woven like gold RIA, the cut cross section of the thin metal sheet is twisted by tensile force, causing twisting that deviates not only at right angles to the plane of the thin metal sheet, but also in parallel and diagonal directions. When the metal fiber nonwoven fabric is pressed onto the metal fiber nonwoven fabric, the metal fiber nonwoven fabric intertwines well with the metal fiber nonwoven fabric.

The material of the X-band metal may be any material, but aluminum, copper, stainless steel, steel, etc. are preferable.

Also, a punched metal having holes of the same shape may be used.

There is no particular limit to the plate thickness, but it is usually 0.211111 to io
+m is used.

If the degree of processing such as cutting and tensioning is selected appropriately depending on the shape and type of the metal fiber, the pressed state between the extended metal and the metal fiber will be good.

The mesh of a predetermined mesh size used in the present invention includes a reinforcing mesh, a protective mesh, and a fine mesh that determines filtration accuracy, and is selected according to the usage conditions of the filter material. Alternatively, several types of mesh having different functions may be stacked in several layers and processed to be integrated.

A filter material using fine mesh is a typical surface filtration type in which solid matter is captured only on the surface of the filtration control layer, and is a filter material with excellent filtration A accuracy and cleaning reproducibility.

In particular, it is preferable that the mesh body is made of SUS or carbon fiber, since it is possible to obtain rod bodies of various mesh sizes with excellent corrosion resistance.

The invention will now be described with reference to preferred embodiments shown in the drawings.

The present invention has a first aspect consisting of a combination of a metal fiber non-woven fabric and an X-band metal, and a second aspect consisting of a combination of a metal fiber non-woven fabric, an X-band metal and a net of a predetermined mesh size. Any method (number of combinations, order of combinations, etc.) may be used and is not limited to the examples described below.

Furthermore, the filter material of the present invention is characterized in that the above combination is formed into a plate-like laminate, and the periphery of this laminate is sealed. Sealing can be done by any means that seals the contents to the extent that they do not leak out, or by heat-pressing, etc., but it can also be done by compressing or rolling at the same time as punching and forming the plate-like laminate. is preferable.

In particular, it is preferable that the Xband metal is an aluminum-based Xband metal and the metal fiber nonwoven fabric is a nonwoven fabric using metal fibers produced from molten aluminum metal by a spinning method. Since aluminum-based nonwoven fabrics and X-band metals are highly malleable, they can be tightly bonded by high pressure during compression or rolling.

In the following explanation, an example using an aluminum-based exband metal and an aluminum-based metal fiber nonwoven fabric will be described, but the present invention is not limited thereto.

(1) The filter material 5 of the present invention is shown in FIGS. 1a to 1C.

In the present invention, the X-band metal 1 shown in FIG. 1C is laminated on both sides of the metal fiber nonwoven fabric 2, and if necessary,
00 kg/cm” by press or roll pressure welding,
Preferably, the disk shape shown in FIG. 1a is punched out, and the first
As shown in Figure b, the filter material 5 is formed by pressing aluminum 1Jliiffl and aluminum exband metal together to form a sealing part 4 so as not to peel off the periphery of the disk.

This filter material is used as an oil mist separator or a filter for filtering air, gas, etc.

A preferred method of use is an oil mist separator as shown in FIG. Oil mist containing moisture is inlet 11
from the stator 12 and rotor 13 to the exhaust valve 1.
4 and an oil mist separator having a filter material 5 according to the invention, the moisture-laden gas is discharged into the atmosphere via an outlet 16 and the oil is recovered via a drain 15.

In this way, if the filter material of the present invention is used in an oil mist separator for exhaust gas from automobiles, etc., it will: 1) Completely remove oil mist from the exhaust, and 2) Coagulate and collect the oil mist, thereby reducing oil consumption. be effective.

(2) As shown in FIGS. 3a and 3b, the filter material 5 of the present invention includes an aluminum-based exband metal 1,
An aluminum-based metal fiber nonwoven fabric 2, a stainless steel, carbon fiber-based, copper-based, aluminum-based or cloth mesh body 3 of a predetermined mesh size, and an aluminum-based exband metal 1 are formed into a predetermined shape and are pressure-welded as necessary. The filter material 5 is then laminated into a plate-like body, and the periphery of this plate-like body is compressed or rolled to form a sealing part 4 to form a filter material 5.

The filtration accuracy is determined by the filter material 5 and the predetermined mesh net 3.

(3) Furthermore, as shown in Figures 4a and 4b, Al
AJl-based X-band metal 1 is applied on both sides of the Al-based metal fiber non-woven fabric 2, and the laminate of the Al-based metal fiber non-woven fabric 2 and X-band metal 1 is pressed or rolled at 300 to 2000 kg/cm2, with an adhesive sheet 6 interposed therebetween. Fine mesh wire mesh or cloth mesh bodies 3 that determine filtration accuracy are laminated, heated and bonded with an adhesive sheet 6, and the sealed portion 4 around this plate-shaped body is compressed or rolled to form a filter material. It is also good to set it to 5. Further, the periphery of the plate-like laminate of the metal fiber nonwoven fabric 2 and the X-band metal 1 may be formed into a sealing portion 4 as described above, and then the net body 3 may be bonded with the adhesive sheet 6.

The material of the adhesive sheet 6 is preferably polyester, polyamide, or ethylene vinyl acetate (EVA), and by adhering these, the fine mesh net 3 with precision is adhered, and a good filter material 5 is created. .

When a cloth material is used for the net body 3, a sound absorbing effect can be obtained depending on the thickness of the cloth material, and the filter material 5 of the present invention can also be used as a good sound filter material (sound absorbing material).

<Example> The present invention will be specifically described below using Examples.

(Example 1) The following materials were prepared for the purpose of investigating the effects of using the filter material of the present invention in an oil mist separator.

i) Al, Exband metal with a thickness of 0.5n+m (center distance in the short direction 3 ll1m, center path in the long direction 1114mm) ii) Al non-woven fabric with an areal density of 1650 g/m2 (Al fiber diameter 100 μm) iii) Same as i) I) 10th) +1ii) Plate thickness? , 6ms This is the first
Combined in layers as shown in Figure c, the diameter 10 shown in Figure 1a is
An oil mist separator was obtained by punching out a centimeter disc shape and simultaneously compressing the aluminum in the peripheral part to 0.8 ton/cm2 or more.

The obtained sample was attached to the filter material 5 shown in FIG. 2, and the state of removal of oil mist during exhaust from the rotary pump was measured. Water removal was almost complete, with 99.9% of water removed.

(Example 2) For the purpose of separating free water mixed into aircraft fuel including jet fuel, gasoline, kerosene, etc. and removing foreign substances at the same time, the purpose was to prevent particles with a diameter of 50 μm from passing through. The present invention was used as a filter material where 45% was desired.

For this purpose, AIl nonwoven fabric alone has a diameter of 50 μm.
Since it is impossible to remove foreign matter, the specified 50 μm
A stainless steel mesh body with a mesh size of , an Al nonwoven fabric, and an Aλ exband metal were used. In other words, moisture is absorbed through a reinforcing mesh (Al nonwoven fabric) and a protective mesh (Au
It consists of a layer that captures the filtration control surface (Exband Metal) and a stainless steel mesh that is a precision filtration layer.

The configuration is shown in Figures 3a and 3b.

I) Al exband metal with a thickness of 0.5 am (same as Example I) 100 am long, 5011 111 m wide
i) Stainless steel wire gauze with mesh size of 50 μm, length 90 mm, width 50+++ m 1v) Similar to f, these were overlapped as shown in Figure 3a, and both sides were compressed to the interatomic distance. Its thickness was approximately 1 m+a.

The produced filter material was used as a separator element.
It was possible to remove more than 99.9% of foreign matter larger than μm and water in oil.

The oil purified by the filter material of the present invention is widely used as fuel, lubricating oil, hydraulic oil, vacuum pump oil, etc. Even a small amount of solid foreign matter mixed into the oil can cause equipment trouble, and the mixing of moisture not only causes the equipment itself to rust, but also accelerates the deterioration of the oil, causing the oil itself to lose its performance. When it comes to aviation fuel, water contamination causes the water in the oil to freeze due to low temperatures, which can clog valves in the fuel system. By using the filter material of the present invention, such risks can be effectively avoided.

<Effects of the Invention> The first aspect of the present invention is an excellent filter material having mechanical strength, heat resistance, cold resistance, and durability, and can be effectively used in oil mist separators and the like.

The second aspect of the present invention is a filter material that can strictly control the desired filtration diameter necessary for the diffusion of gases and liquids, and has excellent mechanical strength, heat and cold resistance, and durability.

[Brief explanation of the drawing]

FIG. 1a is a perspective view of an embodiment of the first aspect of the invention. FIG. 1b is a sectional view taken along line 1-1 in FIG. 1b. FIG. 1c is an exploded perspective view of the embodiment shown in FIG. 1a. FIG. 2 is an explanatory diagram showing the state in which the present invention is applied to an oil mist separator. Figure 3a is an exploded perspective view of an embodiment of the second aspect of the invention. Figure 3b is a cross-sectional view of an embodiment of the second aspect of the invention. FIG. 4a is an exploded perspective view of another embodiment of the second aspect of the invention. FIG. 4b is a sectional view showing another embodiment of the second aspect of the invention. Explanation of symbols 1...Exband metal 2...Metal fiber nonwoven fabric 3...Network 4...Sealing part 5...
Filter material 6...Adhesive sheet 11...Intake port 12...Stator 13...Rotor
14...Exhaust valve 15...Drain
16... Exit patent applicant Unix Co., Ltd. FIG, 1a FfG, 1c FIG, 2 FfG, 3a

Claims (6)

[Claims] (1) A filter material characterized by being formed by sealing the periphery of a plate-like laminate of metal fiber nonwoven fabric and X-band metal. (2) The filter material according to claim 1, wherein the metal fiber nonwoven fabric is a metal fiber nonwoven fabric mainly composed of metal Al, and the Exband metal is an Exband metal mainly composed of metal Al. . (3) A filter material characterized by being formed by sealing the periphery of a plate-like laminate of a metal fiber nonwoven fabric, an X-band metal, and a net of a predetermined mesh size. (4) The filter material according to claim 3, wherein the metal fiber nonwoven fabric is a metal fiber nonwoven fabric mainly composed of metal Al, and the Exband metal is an Exband metal mainly composed of metal Al. . (5) The filter material according to claim 3 or 4, wherein the mesh body is made of stainless steel. (6) The filter material according to any one of claims 3 to 5, wherein the net is made of carbon fiber.