JPH11262614A - Filter member and filter using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate disposal as well as to reduce cost by forming a filter member for removing gaseous components, dust and oil components in gases predominantly from an expanded graphite sheet. SOLUTION: Expanded graphite can easily capture impurities such as gaseous components, dust and oil components in gases, also has the function of a molecular sieve and can therefore capture the gaseous components on the molecular level. Since expanded graphite has particularly high surface activity and a lipophilic surface, it is excellent in property of adsorbing particulates of oil components, etc., or particulates having lipophilic surfaces such as soot. The desired filter is obtd. using an expanded graphite sheet. At this time, a filtermember 1 is formed so that recesses 3, protrusions 2 and/or through holes or concavities are provided to the surface to increase the surface area of the filter member 1 coming in contact with gases. A bent structure is preferably adopted as the recesses 3 and the protrusions 4 to easily form the rugged shape and gas passages are easily ensured at the time of forming the filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter member for removing gas components, dust and oil in a gas, and a filter using the same.

[0002]

2. Description of the Related Art Conventionally, bag filters have been used as filters used in the above-mentioned fields. However, since bag filters are made of a Teflon mesh material, which is a resin material, they have low heat resistance (about 250 ° C.). But the price is high. Furthermore, removal of gas components cannot be expected. In addition, non-combustible Teflon is difficult to dispose of, and when it is regenerated, the running cost is high. For example, it is necessary to frequently remove dust.

[0003] In addition, there is a filter made of an electrostatic precipitator, a filter member made of activated carbon or activated coke, but the electric precipitator has a high price, a high running cost and low heat resistance, like the bag filter. In addition, gas components cannot be removed. Activated carbon and activated coke filter members are also discarded and removed (dust removal is not expected),
They do not satisfy their handling properties in a well-balanced manner.

[0004]

SUMMARY OF THE INVENTION The present invention provides a filter having excellent heat resistance, low cost, low running cost, easy disposal, and capable of collecting any of gas components, dust, oil and the like. And a filter member forming the same.

[0005]

The filter member according to the first aspect of the present invention mainly comprises a sheet-like expanded graphite sheet.

Expanded graphite has a specific surface area of 20 to 22 m ² /
g, and easily captures impurities such as gas components, dust, and oil in the contacted gas by physical adsorption. In addition, since expanded graphite is an intercalation compound, it also has a molecular sieving function. Therefore, impurity gas components in the gas can be captured at the molecular level. In particular, since it has a high surface activity and a lipophilic surface, it is excellent in adsorbability of fine particles such as oil or fine particles having a lipophilic surface such as soot.

[0007] Expanded graphite is excellent in heat resistance and chemical resistance, and thus maintains stable shape retention and impurity trapping function even in a high temperature region (450 ° C) due to incineration gas or the like.

On the other hand, since it is made of expanded graphite, it is completely lost by incineration, so that it can be easily disposed of in an incinerator after use.

Further, since expanded graphite has flexibility and processability, it is advantageous in that it can be easily processed into an arbitrary shape, has excellent handleability, and is less expensive than Teflon or the like.

Therefore, a filter having the above-described functions and effects can be obtained by forming a filter using the above-mentioned filter member so that the gas contacts the surface of the expanded graphite sheet.

The filter member of the present invention preferably has an uneven shape on the surface and / or has a through hole and / or a depression on the surface.

With such a structure, the surface area of the filter member that comes into contact with the gas increases, and the ability to trap impurities increases.

[0013] More preferably, the uneven shape is provided.
Or as described in 4, it is good to be a bent structure and / or to form a groove shape on the surface of the sheet-like expanded graphite sheet.

By adopting such a shape, it is possible to easily form an uneven shape, and it is easy to secure a gas flow path when a filter is formed.

According to a sixth aspect of the present invention, there is provided a filter member in which at least the entire surface or a part of the highly oriented portion of the surface on the main surface side is removed, and / or the entire surface or a part thereof is erected. It may be made to form a thin-leafed graphite portion that has been expanded.

Due to the pressure applied when the expanded graphite is formed into a sheet, a state in which the expanded graphite particles are densely and highly oriented occurs on the sheet surface, and the crystal plane at that portion is pressed and adhered substantially parallel to the surface. It has been done. By performing the surface treatment as described above, the highly oriented state of the expanded graphite particles is eliminated, the specific surface area is increased to 25 to 27 m ² / g, and the ability to capture impurities in gas, particularly to capture fine particles, is increased. In addition, the interlayer portion is exposed on the surface, and the molecular sieve function is also improved.
In addition, in the high orientation state, cracks and the like are likely to occur on the surface, and it is difficult to form a bent structure. However, by eliminating the high orientation state, the surface becomes flexible, and processing into various shapes is easy. become. Furthermore, when coating or the like is performed on the surface as described below, in a highly oriented state, an adhesive or the like hardly penetrates between the graphite particles, and the coating layer is easily peeled off. Etc. are less likely to occur.

In the filter member of the present invention, at least the whole or a part of the surface on the main surface side is coated with a material having another impurity trapping function such as activated carbon and / or slaked lime. It may be.

By providing a coating layer, it becomes possible to capture more kinds of impurities.

The filter according to claim 8 of the present invention comprises:
A gap formed by laminating the sheet-like filter member made of expanded graphite having no irregularities on the surface and the filter member according to any one of claims 2 to 7 above is used as a gas flow path.

With the above-described structure, the gas flow path can be easily formed, and the size, the number, and the like of the gas flow path can be arbitrarily set. Further, since there is no auxiliary equipment, it is advantageous in terms of running cost.

Since the expanded graphite is excellent in flexibility and workability, the filter can be formed into various shapes while having the above-described structure. Can have a compact shape such as a cylindrical shape or a rectangular parallelepiped shape.

The filter member according to claim 11 of the present invention is a strip-shaped expanded graphite sheet.

When the filter member is made of flake-shaped expanded graphite, it has the advantage of the above-mentioned expanded graphite, and the surface area of the filter member that comes into contact with gas increases, so that the ability to capture impurities increases. Further, by filling the filter member in a container having a predetermined shape to form a filter as described later, a filter having an arbitrary shape and size can be easily formed.

The filter member according to claim 11 of the present invention preferably has an uneven shape on the surface and / or has a through hole and / or a depression on the surface, as described in claim 12 or 15.

With such a structure, the surface area of the filter member that comes into contact with the gas increases, and the ability to trap impurities increases.

[0026] More preferably, the concave and convex shape is the following.
As described in 3 or 14, it is a folded structure,
It is preferable that a groove shape is formed on the surface of the expanded graphite sheet.

By adopting such a shape, it is possible to easily form an uneven shape, and it is easy to secure a gas flow path when a filter is formed.

According to a fifteenth aspect of the present invention, as described in the sixteenth aspect, the filter member is obtained by removing the whole surface or a part of the high orientation part of the surface and / or standing up the whole surface or a part. It may be made to form a thin-leafed graphite portion that has been expanded.

By performing the above surface treatment,
As in the case of the filter member according to the sixth aspect, the expanded graphite particles do not have a high orientation state, and the ability to trap impurities in gas and the function of molecular sieving are increased. In the highly oriented state, cracks and the like are likely to be generated on the surface, and it is difficult to form a bent structure. However, by eliminating the highly oriented state, the surface becomes flexible and can be easily processed into various shapes. Become. Furthermore, when coating or the like is performed on the surface as described below, in a highly oriented state, an adhesive or the like hardly penetrates between the graphite particles, and the coating layer is easily peeled off. Etc. are less likely to occur.

The filter member according to the eleventh aspect of the present invention is, as described in the seventeenth aspect, coated on the entire surface or a part thereof with a material having an impurity trapping function such as activated carbon and / or slaked lime. It may be as follows.

By providing the coating layer, it becomes possible to capture more kinds of impurities.

A filter according to claim 18 of the present invention is obtained by filling the filter member according to any one of claims 11 to 17 into a container having a predetermined shape.

With the above structure, the specific surface area of the filter is increased, and a filter having an arbitrary shape and size can be easily formed. Further, since there is no auxiliary equipment, it is advantageous in terms of running cost.

A filter according to a nineteenth aspect of the present invention is a filter obtained by integrally forming expanded graphite particles into a predetermined shape by applying pressure, and has a density of 0.1 to 1.0.
g / cm ³ .

With the above structure, the specific surface area of the filter is increased, and a filter having an arbitrary shape and size can be easily formed. Further, since there is no auxiliary equipment, it is advantageous in terms of running cost.

The filter according to claim 20 of the present invention is characterized in that a mixture of expanded graphite particles and a material having an impurity trapping function such as activated carbon and / or slaked lime is integrally formed into a predetermined shape by applying pressure. Become.

By including another material having an impurity trapping function, it becomes possible to trap more kinds of impurities in addition to the trapping function by the expanded graphite particles.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 is a perspective view showing the shape of a filter member made of expanded graphite, which is one embodiment of the present invention. The filter member of FIG. 1 is made of a sheet-like expanded graphite sheet, and has a continuous chevron-shaped bent structure so that the surface has an uneven shape. The size (width and height of peaks or projections or valleys or depressions), spacing, and spacing of the folded structure, the sheet-like filter member having no irregularities on its surface, and the above-mentioned filter member are overlapped to form a filter. There is no particular limitation as long as a desired void portion is formed when formed. Furthermore, a wrinkled shape may be used instead of a clear bent structure.

Further, in the bent structure, the respective convex portions 2 (concave portions 3) need not be parallel to each other as long as a desired gap is formed when the above-described filter is formed.

The planar shape and size of the filter member of the present invention may be appropriately set depending on the shape and size of the filter formed using the filter member.

For example, in a shape as shown in FIG.
In the case of a filter member of 0 mm × 300 mm, the width x of the uneven portion in the drawing is 15 mm, and the difference in height of the uneven portion is 10 mm.
The degree is good.

The expanded graphite sheet is obtained by integrally forming expanded graphite particles obtained by expanding graphite crystals into a sheet, and may be a commercially available sheet.

The method of forming the bent structure is not particularly limited, and it can be formed, for example, by bending a flat expanded graphite sheet. In addition, as a method of bending, a generally used method such as a method using a gear or a hammering roller can be used.

Further, another embodiment of the filter member of the present invention will be described below. Another Embodiment 1 FIG. 2 is a perspective view showing the shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention. The filter member shown in FIG. 2 has a thin leaf-like graphite portion which rises and spreads over the entire surface of the main surface side surface of the filter member shown in FIG. 1 so that there is no highly oriented portion.

Means for forming the expanded thin leaf graphite portion include, for example, microblasting, ultrasonic irradiation, laser beam irradiation, and the like. In order to employ the microblasting, the following conditions should be satisfied.
That is, if the expanded graphite is commercially produced, the dimension in the width direction (the direction perpendicular to the laminating direction) is 1 mm or less, and from this point, the particles used in the microblasting are: Those having a particle diameter of 1 mm or less are preferred. Considering the gap in the direction of lamination of the expanded graphite particles, it is preferable to use a microblast having a particle diameter of 10 to 20 μm. Examples of particles at the time of microblasting include SiC, glass beads, iron powder, walnut powder, and plastic beads.

[Second Embodiment] Alternatively, the filter member of FIG. 1 may be obtained by removing the entire surface or a part of the highly oriented portion of the main surface of the filter member.

Examples of the method for removing the highly oriented component include microblasting, ultrasonic irradiation, and laser light irradiation. Specifically, for example, the particle size is 50 to 100.
Micro-blasting using particles such as walnut powder of μm, the weight of the expanded graphite substrate is preferably 0.5 to
A removal treatment is performed to reduce the weight within a range of 3%, and a diffraction peak value by X-ray diffraction of a surface layer portion of the expanded graphite base material exposed by the removal treatment is set to a range of 26.52 ° to 26.48 °. Thereby, the surface layer portion also has a configuration in which the compressed graphite particles having the same size and large thickness as the inner layer portion are randomly arranged.

The surface treatment states such as the formation of the flared graphite portion that rises and expands or the removal of the highly oriented portion may be mixed. In the case of microblasting, both states appear.

The surface treatment such as formation of the thin leaf-like graphite portion which is raised and expanded or removal of the highly oriented portion may be performed at least on the main surface side which is the gas flow path side when the filter is formed. , May be applied to the other surface, and may be a part instead of the entire surface.

Third Embodiment FIG. 3 is a perspective view showing the shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention. The filter member of FIG. 3 has the same shape as the filter member of FIG. 1, and further has a through hole and / or a depression on the surface. Also, only through holes,
Alternatively, only the depressions or a combination thereof may be used.

The size (hole diameter), cross-sectional shape,
The number, arrangement, and the like to be formed are not particularly limited, and are appropriately set within a range that does not inhibit the operation of the present invention.

The means for forming the through-holes or depressions include, for example, drilling or embossing.

[Embodiment 4] The above-described surface modification and formation of through holes may be combined. FIG. 4 is a perspective view showing a shape of a filter member made of expanded graphite which is another example of the embodiment of the present invention.
Further, through holes and / or depressions are formed on the surface.

[Fifth Embodiment] FIG. 5 is a perspective view showing a shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention. The filter member of FIG. 5 is obtained by coating the entire surface of the main surface of the filter member of FIG. 4 with activated carbon or the like, and has a state in which activated carbon particles adhere to the surface.

The material to be coated is not limited to activated carbon, and any other material that imparts a function of trapping impurities to the expanded graphite surface, such as slaked lime, does not impair the function of the present invention. There is no particular limitation on the range.

Examples of the method for coating activated carbon, slaked lime, etc. include a method using an adhesive, a method using a double-sided adhesive tape (shown in FIG. 8), and a pressure bonding method. Either method can be performed by a method generally used generally.

[Another Embodiment 6] The surface unevenness of the filter member of the present invention may be other than a folded structure.
FIGS. 6A and 6B are perspective views showing the shape of a filter member as another example of the embodiment of the present invention. Each of the filter members of FIG. 6 is made of a sheet-like expanded graphite sheet and has a groove shape on the surface. Groove shape, size (recess,
Alternatively, when the filter is formed by stacking the sheet-like filter member having no irregularities on the surface and the filter member, a desired gap portion is formed. If it is, there is no particular limitation.

In the groove shape, the convex portions 2 (concave portions 3) do not have to be parallel to each other as long as a desired void portion is formed when the above-described filter is formed.
Further, as for each convex portion (concave portion), the convex portion and the concave portion may correspond as shown in FIG. 6A, or one surface of the filter member and the other surface as shown in FIG. 6B. In terms of aspects, they may be independent.

The planar shape and size of the filter member may be appropriately set according to the shape and size of a filter formed using the filter member.

For example, in the case of a filter member having a shape as shown in FIG.
In the figure, the width x ′ of the convex portion is 5 mm, the width x ″ of the concave portion is 5 mm,
It is preferable that the difference y 'in height between the uneven portions is about 5 mm.

The method for forming the groove shape is not particularly limited. For example, the groove shape may be formed by cutting the surface of a flat expanded graphite sheet, or the sheet may be formed in advance so as to have a desired groove shape. May be.

The above-described filter member of the present invention is used as a filter having a void formed by laminating the filter member and a sheet-like filter member made of expanded graphite having no irregularities on its surface as a gas flow path. Can be

FIG. 7 is a perspective view showing the shape of a filter according to one embodiment of the present invention. The filter shown in FIG. 7 is obtained by stacking a filter member as shown in FIG. 5 and a flat expanded graphite sheet as shown in FIG. 8, and forming a gap between the surfaces of the filter as a gas flow path. As such, it has a cylindrical overall shape wound in a spiral shape.

The overall shape and size of the filter are not particularly limited as long as a desired gas flow rate can be obtained, and the overall shape may be another shape such as a rectangular parallelepiped. Further, a filter member having an uneven shape on the surface and a flat plate-shaped filter member may be formed so as to overlap in a concentric shape or a similar shape in the outer peripheral direction. Furthermore, the number of layers to be stacked in the outer peripheral direction of the filter is not particularly limited, as a single layer in which the filter member having the uneven shape on the surface and the flat filter member are stacked.

As a method of forming a filter member having an uneven shape on the surface and a filter member in a flat plate shape into a cylindrical or rectangular parallelepiped shape, a method of bonding with an adhesive or an adhesive tape, or fixing with a jig or the like is used. And the like.

In the above-described filter, the flat expanded graphite sheet is also formed with a thin leaf-like graphite portion which is raised and expanded.
Or surface modification such as removal of highly oriented parts, activated carbon,
Coating of a material imparting a function such as slaked lime with another impurity trapping function or the like, formation of a through hole, or the like may be performed. (However, excluding the formation of through holes in the outermost peripheral surface of the filter)

The present invention further provides a filter member which is a strip-shaped expanded graphite sheet. FIG. 9 shows the shape of a strip-shaped expanded graphite sheet as the embodiment.

[Alternative Embodiment 7] The filter member, which is the strip-shaped expanded graphite sheet, has the same bent structure and groove shape as the previous embodiment or [Alternative Embodiment 6] on the surface. You may have.

[Alternative Embodiment 8] Further, as shown in FIG. 10, the filter member which is the strip-shaped expanded graphite sheet has the same surface modification as [Alternative Embodiment 1] or [Alternative Embodiment 2]. Quality may be given.

[Embodiment 9] Further, as shown in FIG. 11, the filter member, which is the strip-shaped expanded graphite sheet, has through holes and / or depressions on the surface similarly to [Embodiment 3]. May be provided.

[Embodiment 10] The above-described surface modification and formation of through holes and / or depressions may be combined. FIG. 12 shows a structure in which a through hole is further formed in the filter member of FIG. 10 in a direction perpendicular to the surface.

[Alternative Embodiment 11] The filter member, which is the flake-shaped expanded graphite sheet, has an entire surface or a part of the surface of which captures impurities such as activated carbon and slaked lime, as in [Alternative Embodiment 5]. Materials imparting functions such as functions may be coated.

The filter member which is a strip-shaped expanded graphite sheet as described above can be obtained by cutting a flat expanded graphite sheet. In addition, the above-mentioned other embodiments 7-1
The filter member such as 1 can be obtained by further performing the same treatment as in the other embodiments 1 to 6 on the filter member obtained by cutting, or by cutting the filter members of the other embodiments 1 to 6.

The size of the strip-shaped filter member is not particularly limited as long as a desired impurity trapping function and a gas throughput can be obtained when forming a filter as described below.

The method of cutting the strip-shaped filter member is not particularly limited, and a method of cutting sheets in general can be used.

The strip-shaped filter member of the present invention is used as a filter having the filter member and an arbitrary gap formed by filling a container having a predetermined shape as a gas flow path. FIG. 14 is a perspective view showing a shape of a filter according to one embodiment of the present invention, which is formed by filling the filter member of FIG. 9 into a cylindrical container.

In the filter formed from the strip-shaped filter member, the container for accommodating the filter member has at least a gas inlet and a gas outlet, and includes, for example, a container made of a mesh material. . The shape is not particularly limited as long as a desired gas throughput can be obtained, and examples thereof include a cylindrical shape or a rectangular parallelepiped shape.

According to the present invention, the expanded graphite particles are integrally formed into a predetermined shape by applying pressure, and the density is 0.1%.
To provide a filter of ~1.0g / cm ^3. FIG.
Indicates a filter according to the embodiment.

The graphite particles forming the filter include expanded graphite particles as shown in FIG.

Further, the expanded graphite particles shown in FIG. 13 are mixed with activated carbon, slaked lime and other materials having a function of trapping impurities, etc., and integrated into a predetermined shape by applying pressure as in the filter shown in FIG. The filter may be formed by molding. The mixing ratio between the expanded graphite particles and a material having a function such as an impurity trapping function, and the density of the filter are not particularly limited as long as a desired impurity trapping function and gas throughput can be obtained.

The filter can be formed by a general method such as pressure forming.

The filters shown in FIGS. 7, 14 and 15 of the present invention can be used in combination of the same or different types, and can be used in combination with other activated carbon filters and the like. Can also.

Hereinafter, the effects of the present invention will be described in detail with reference to Test Examples and Examples. Test Example 1 A long expanded graphite sheet (Pillafoil ^R : manufactured by Nippon Pillar Industry Co., Ltd.) having a thickness of 0.38 mm and a width of 30 mm was coated on one surface with SiC powder having a particle diameter of 10 to 20 μm, and air pressure was 2 kg / cm. FIG. 17 shows the surface states before and after the microblasting after microblasting in Sample ² (Samples B to D and Sample A have no processing). Sample A: Before micro blast processing Sample B: Micro blast processing 10 seconds Sample C: Micro blast processing 20 seconds Sample D: Micro blast processing 60 seconds

Test Example 2 The filter of Example 1 was housed in a basket with a lid having a diameter of 390 mm and placed in a flow path of actual waste gas in an incinerator, and the adsorption of dust and dioxins was measured. Table 1 shows the results.

[0085]

[Table 1]

Test Example 3 The filter of Example 3 (the filter of Example 1 + activated carbon filter) was installed in the flow path of the actual waste gas of the incinerator (the filter of Example 1 was on the upstream side). The adsorptivity of dust and dioxins was measured. Table 2 shows the results.

[0087]

[Table 2]

[0088]

Example 1 A long expanded graphite sheet having a thickness of 0.38 mm and a width of 30 mm (Pillar Foil ^R : manufactured by Nippon Pillar Industry Co., Ltd.) was coated on one surface with SiC powder having a particle diameter of 10 to 20 μm. Microblasting is performed at a pressure of 2 kg / cm ² to form a thin-leafed graphite portion that rises and expands in a part. A double-sided pressure-sensitive adhesive tape smaller in width than the expanded graphite sheet is adhered in the lengthwise direction of the expanded graphite sheet, and commercially available powdered activated carbon (MA mark: Taihei Chemical Industry Co., Ltd.) is uniformly scattered on the remaining adhesive surface. Coating. Further, the expanded graphite sheet is bent by being passed between two gears, and as shown in FIG. 1, the width x of the uneven portion x = 5 mm and the difference y in the height of the uneven portion as shown in FIG.
= 2 mm filter member was prepared. The filter member and a flat elongated graphite sheet (Pillafoil ^R : manufactured by Nippon Pillar Industry Co., Ltd.) having a thickness of 0.38 mm and a width of 30 mm are superimposed on each other as shown in FIG. 8 and spirally wound. Turn to 240m diameter as shown in Fig. 7
m of cylindrical filter was formed. The filters were stacked in five stages in the direction of the gas flow path to obtain the filter of Example 1.

Example 2 In the same manner as in Example 1, an expanded graphite sheet formed by microblasting and forming an expanded thin leaf-like graphite portion on a part was cut into an arbitrary size of 1 mm to 20 mm. About 1 kg of the obtained strip was stored in a basket with a lid having a diameter of 390 mm and a height of 50 mm, and a filter as shown in FIG. 14 was formed.

Example 3 Example 1 was combined with the filter of Example 1 and a commercially available activated carbon filter (Diahope: manufactured by Mitsubishi Chemical Corporation).
Example 3 in which the filter of FIG.
And

[0091]

The filter member of the present invention comprises a gas component,
Both dust and oil can be trapped and have excellent heat resistance, and the filter made of the filter member can be used stably even at high temperatures. In addition, since it is formed mainly of a material that can be incinerated, disposal processing is simple and low running cost is achieved.

By making the filter member of the present invention a specific shape, the specific surface area is increased, and the function of trapping impurities can be enhanced.

[0093] Further, the impurity trapping function can be further enhanced by surface modification, coating of a material imparting a function such as activated carbon, slaked lime or the like with another impurity trapping function, or formation of through holes. .

The filter of the present invention does not require any additional equipment, and is advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a shape of a filter member made of expanded graphite, which is one embodiment of the present invention.

FIG. 2 is a perspective view showing a shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention.

FIG. 3 is a perspective view showing a shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention.

FIG. 4 is a perspective view showing a shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention.

FIG. 5 is a perspective view showing a shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention.

FIGS. 6A and 6B are perspective views each showing a shape of a filter member made of expanded graphite, which is another example of the embodiment of the present invention.

FIG. 7 is a perspective view showing a shape of a filter which is one of the embodiments of the present invention.

FIG. 8 is a view showing a state in which a filter member having irregularities on its surface and a flat expanded graphite sheet are stacked.

FIG. 9 is a view showing a shape of a filter member which is a strip-shaped expanded graphite sheet.

FIG. 10 is a view showing the shape of another example of the embodiment of the filter member which is the flaky expanded graphite sheet of the present invention.

FIG. 11 is a view showing the shape of another example of the embodiment of the filter member which is the flaky expanded graphite sheet of the present invention.

FIG. 12 is a view showing the shape of another example of the embodiment of the filter member which is the flaky expanded graphite sheet of the present invention.

FIG. 13 is a diagram showing a shape of an example of expanded graphite particles.

FIG. 14 is a diagram illustrating an example of an embodiment of a filter formed by filling a strip-shaped expanded graphite sheet into a container having a predetermined shape.

FIG. 15 is a diagram showing an example in which expanded graphite particles are integrally formed into a predetermined shape by applying pressure, and have a density of 0.1 to 1.
It is a figure showing an example of an embodiment of a filter of 0 g / cm ³ .

FIG. 16 is a diagram for explaining a state of a thin leaf-like graphite portion which is raised and expanded.

FIG. 17 is a photograph substituted for a drawing,
FIG. 17A is an SEM photographic image showing the surface state of the expanded graphite sheet before microblasting, and FIGS.
(D) is an SEM photographic image showing the state after microblasting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter member 2 Convex part 3 Concave part 4 Surface treatment part 5 Through-hole 6 Activated carbon particle 7 Filter 8 Coating part 9 Double-sided tape 10 Void part (gas flow path) 12 Filter member 13 Expanded graphite particles 14, 15 Filter 16 Holding container 17 Flat filter member 18 Expanded graphite 19 Thin-leaf graphite portion 20 Expanded graphite sheet 20a Expanded graphite sheet main surface

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 16, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The filter member of the present invention preferably has an uneven shape on the surface and / or has a through hole and / or a depression on the surface.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013] More preferably, the concavo-convex shape is a bent structure and / or a groove is formed on the surface of the sheet-like expanded graphite sheet.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

According to the first aspect of the present invention, at least the entire surface or a part of the highly oriented portion of the surface on the main surface side is removed, and / or the entire surface or a part thereof is erected. To form an expanded thin leaf graphite portion.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

In the filter member of the present invention, at least the entire surface or a part of the surface on the principal surface side is coated with a material having another impurity trapping function such as activated carbon and / or slaked lime. It may be.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

The filter according to the present invention is such that a void formed by laminating a sheet-like filter member made of expanded graphite having no irregularities on the surface and the above-described filter member serves as a gas flow path. There may be.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

Since expanded graphite is excellent in flexibility and workability, it is possible to form the filter into various shapes while having the above-described structure. For example, the entire shape is compact such as cylindrical or rectangular parallelepiped. It can be shaped.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

The filter member according to the present invention may be a strip-shaped expanded graphite sheet.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

The filter member made of a flake-shaped expanded graphite sheet preferably has an uneven surface and / or has a through hole and / or a depression on the surface.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

More preferably, the uneven shape is a bent structure and / or a groove is formed on the surface of the expanded graphite sheet.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

The filter member made of a flake-like expanded graphite sheet is obtained by removing a highly oriented part of the entire surface or a part of the surface thereof, and / or erecting and expanding the entire sheet or a part thereof. A portion may be formed.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Change

[Correction contents]

By performing the above surface treatment,
As in the case of the filter member according to the first aspect, the highly oriented state of the expanded graphite particles is eliminated, and the function of trapping impurities in gas and the function of molecular sieving are increased. In the highly oriented state, cracks and the like are likely to be generated on the surface, and it is difficult to form a bent structure. However, by eliminating the highly oriented state, the surface becomes flexible and can be easily processed into various shapes. Become. Furthermore, when coating or the like is performed on the surface as described below, in a highly oriented state, an adhesive or the like hardly penetrates between the graphite particles, and the coating layer is easily peeled off. Etc. are less likely to occur.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

The filter member made of a flake-shaped expanded graphite sheet has activated carbon and / or
Alternatively, another material having an impurity trapping function such as slaked lime may be coated.

[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

The filter according to the present invention may be such that the above-described filter member is filled in a container having a predetermined shape.

[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction contents]

The filter according to the present invention is a filter obtained by integrally forming expanded graphite particles into a predetermined shape by applying pressure, and may have a density of 0.1 to 1.0 g / cm ³ .

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

The filter according to claim 3 of the present invention comprises:
A mixture of the expanded graphite particles and a material having a function of trapping impurities such as activated carbon and / or slaked lime is integrally formed into a predetermined shape by applying pressure.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Susumu Yasuko, inventor 541, 541, Shimouchi jinji bat, Mita City, Hyogo Prefecture Inside the Mita Plant of Nippon Pillar Industry Co., Ltd. No. 541 of the character hitting ground in the Mita factory of Nippon Pillar Industry Co., Ltd. (72) Inventor Kimihito Ueuchi No. 541 of the character hitting ground of Shimouchi in Mita city, Hyogo Prefecture No. 1 in the Mita factory of Nippon Pillar Industry Co., Ltd.

Claims (20)

[Claims] 1. A filter member mainly comprising a sheet-like expanded graphite sheet. 2. The filter member according to claim 1, wherein the surface of the filter member has an uneven shape. 3. The filter member according to claim 2, wherein the concave-convex shape has a bent structure. 4. The filter member according to claim 2, wherein the irregular shape is formed by forming a groove on the surface of the sheet-like expanded graphite sheet. 5. The filter member according to claim 1, wherein the filter member has a through hole and / or a depression on a surface. 6. At least the entire surface or at least a part of the highly oriented portion of the surface on the main surface side is removed, and / or the thin leaf-like graphite portion which is erected and expanded on the entire surface or at least part is formed. The filter member according to any one of claims 1 to 5, wherein: 7. The filter member according to claim 1, wherein at least the whole or a part of the surface on the main surface side is coated with activated carbon and / or slaked lime. 8. A gas flow path formed by laminating a sheet-like filter member made of expanded graphite having no irregularities on its surface and the filter member according to any one of claims 2 to 7. A filter characterized by the following. 9. The filter according to claim 8, wherein the overall shape is cylindrical. 10. The filter according to claim 8, wherein the whole shape is a rectangular parallelepiped. 11. A filter member comprising a strip-shaped expanded graphite sheet. 12. The filter member according to claim 11, wherein the surface of the filter member has an uneven shape. 13. The method according to claim 1, wherein the uneven shape is formed by bending an expanded graphite sheet.
2. The filter member according to 2. 14. The filter member according to claim 12, wherein the uneven shape is formed by forming a groove on the surface of the expanded graphite sheet. 15. The filter member according to claim 11, wherein the filter member has a through hole and / or a depression on a surface. 16. The method according to claim 16, wherein the entire surface or a part of the surface is highly oriented, and / or the entire surface or a part of the surface is formed to have an expanded thin leaf graphite portion. The filter member according to any one of claims 11 to 15. 17. The filter member according to claim 11, wherein the entire surface or a part of the surface is coated with activated carbon and / or slaked lime. 18. A filter, wherein the filter member according to claim 11 is filled in a container having a predetermined shape. 19. A filter obtained by integrally forming expanded graphite particles into a predetermined shape by applying pressure, wherein the filter has a density of 0.1 to 1.0 g / cm ³ . 20. A filter comprising a mixture of expanded graphite particles, activated carbon and / or slaked lime, integrally formed into a predetermined shape by applying pressure.