JPH08281016A - Compression filter plate of filter press - Google Patents

Abstract

PURPOSE: To increase the durability of a compression filter plate of a filter press by surely sealing a base plate and a compression elastic body in the peripheral edge parts of the filter plate to surely prevent the leakage of compressed fluid at the time of compression filtration, particularly high pressure compression and also not to apply more pressure than required to a soft sealing material such as rubber. CONSTITUTION: This compression filter plate 1 of the filter press is equipped with a base plate 3 and a compression elastic body 4 with which at least one surface of both the front and the rear surfaces of the base plate 3 is covered. On both the front and the rear surfaces of the peripheral edge part of the base plate 3, frame-shaped projecting parts 5 are formed, and on the frame-shaped projecting part 5 on the side covered with the compression elastic body 4, an annular recessed part 6 is formed. Inside the annular recessed part 6, a sealing material 7 consisting of an elastic body 4 such as rubber more flexible than the compression elastic body 4 is housed. When the filter plate 1 is tightened, the junction between the base plate 3 and a peripheral edge part 4a of the compression elastic body 4 is sealed through the sealing material 7 consisting of the flexible elastic body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press filter plate for a filter press.

[0002]

2. Description of the Related Art Conventionally, a press filter plate of a filter press is
A substrate and a rubber or synthetic resin squeezing elastic body covering both front and rear surfaces of the substrate are provided, and frame front projections are provided on the front and rear surfaces of the peripheral edge of the filter plate substrate. An annular concave portion is provided on the peripheral portion of the elastic body for compression, and an annular convex portion partially fitted in the annular concave portion and protruding toward the substrate is provided on the peripheral edge of the elastic body for compression. The portion was pressed by the adjacent filter plates, and the entire annular convex portion of the compression elastic body was pressed into the annular concave portion on the substrate side.

[0003]

However, in such a conventional squeezing filter plate, the rubber or synthetic resin, which is the material of the elastic body for squeezing, has a relatively high hardness and is hard, and at the time of its production, the squeezing filter is used. Since the accuracy of the thickness parallelism of the peripheral edge of the elastic body is poor, there is a problem in that the compressed fluid cannot be sufficiently sealed when the filter plate is tightened, and the compressed fluid may leak especially during high-pressure compression.

The object of the present invention is to solve the above-mentioned problems of the prior art, and to reliably seal the substrate and the elastic body for pressing at the peripheral portion of the filter plate, and in the case of pressing and filtering, especially during high-pressure pressing. Another object of the present invention is to provide a squeezing filter plate of a filter press which can surely prevent the squeezing fluid from leaking and which does not apply an excessive pressure to the sealing material and has excellent durability.

[0005]

In order to achieve the above-mentioned object, the present invention provides a squeeze filter of a filter press including a substrate and an elastic body for squeezing at least one of the front and rear surfaces of the substrate. In the plate, frame-shaped convex portions are provided on both front and rear sides of the peripheral edge of the substrate, and a ring-shaped concave portion is provided in the frame-shaped convex portion on the side covered with the elastic body for compression. A sealing material made of an elastic material that is softer than that of the elastic material is contained, and when the filter plate is tightened, the space between the substrate and the peripheral portion of the compression elastic material is sealed via the sealing material made of a soft elastic material. The squeeze plate of a filter press, which is designed to be used, is the main point.

In the above description, the material of the elastic body for pressing is synthetic resin such as polypropylene resin or synthetic rubber. Here, the hardness of the elastic body for compression is 90 to 95 °.
(JIS A).

On the other hand, the material of the sealing material is an elastic body made of rubber or synthetic resin which is softer than the elastic body for compression and has a hardness of 50 to 80 °, preferably 6 °.
It is 0 to 70 ° (JIS A).

In the squeezing filter plate, there may be a case where the peripheral edge portion of the squeezing elastic body is provided with an annular convex portion projecting toward the substrate side and a case where it is not provided.

In the former case, in the embodiment in which the annular convex portion of the peripheral edge portion of the compression elastic body is partially fitted into the annular concave portion from the outside of the sealing material made of the elastic body such as soft rubber, At the time of tightening the plate, the sealing material is pushed into the annular recess by the peripheral edge portion of the elastic body for compression and the annular projection, and the sealing material is brought into close contact with the inner surface of the annular recess, thereby achieving the sealing action of the sealing material. Alternatively, when the sealing material is arranged so as to face a portion other than the annular convex portion of the peripheral edge portion of the elastic body for compression, a seal is formed at the peripheral edge portion of the compression filter plate when tightening the filter plate. The material is
The elastic body for compression is pressed by a portion other than the annular convex portion of the peripheral portion of the elastic body for compression and pushed into the annular concave portion, and is brought into close contact with the inner surface of the concave portion, whereby the sealing action of the sealing material is performed.

In the latter case, when the peripheral edge portion of the compression elastic body is not provided with an annular projection protruding toward the substrate side, the sealing material is pressed by the peripheral edge portion of the compression elastic body when the filter plate is tightened. Is pushed into the annular recessed portion and is brought into close contact with the inner surface of the recessed portion, whereby the sealing action of the sealing material is achieved.

In any case, before tightening the filter plate, the outer surface of the peripheral portion of the squeezing elastic body is made to protrude from the surface of the frame-shaped convex portion of the substrate by a required height, and the filter plate is At the time of tightening, the peripheral edge of the squeezing elastic body is pressed against the adjacent filter plate so that the outer surface thereof is substantially flush with the surface of the frame-shaped convex portion of the substrate.

[0012]

According to the squeezing filter plate of the above filter press, the annular concave portion is provided in the frame-shaped convex portion of the peripheral portion of the filter plate substrate on the side covered with the elastic body for squeezing, and inside the annular concave portion,
A seal member made of an elastic material such as rubber that is softer than the elastic material for compression is stored. When the filter plate is tightened, the sealing material is deformed by a constant tightening force, and the substrate and the peripheral portion of the compression elastic body are reliably sealed via the sealing material.
After that, the frame-shaped convex portions of the adjacent filter plates come into close contact with each other through the filter cloth, and the stock solution and the filtrate are sealed. for that reason,
No more pressure than necessary is applied to the sealing material.

Therefore, the rubber or synthetic resin, which is the material of the compression elastic body, has a relatively high hardness and is hard, and even when the accuracy of the thickness parallelism of the peripheral edge portion of the compression elastic body is poor at the time of its manufacture. , Which can be absorbed by a sealing material made of a relatively soft rubber or an elastic body made of synthetic resin housed in the annular recess of the substrate, and therefore, when tightening the filter plate, the sealing material is removed from the substrate at the periphery of the filter plate. It is possible to reliably seal the compression elastic body, and to perform compression filtration, especially 15
It is possible to reliably prevent the squeezing fluid from leaking even during high-pressure squeezing due to a high pressure of up to ²⁰ kg / cm ² . In addition, since the sealing material is not subjected to excessive pressure, the squeezing filter plate has excellent durability.

[0014]

Embodiments of the present invention will now be described with reference to the drawings.

In this specification, front and rear, left and right are based on FIG. 1, the front means the left side of FIG. 1, the rear means the same right side, and the left means the back side of the drawing sheet and the right side. The same side shall be referred to.

1 to 3 show a first embodiment of the present invention.

First, referring to FIG. 1, in the squeezing type filter press, a squeezing filter plate (1) and an ordinary filtering plate (2) arranged in parallel and alternately slide forward and backward on both left and right side bars (not shown). It is supported freely.

The squeezing filter plate (1) comprises a substrate (3) and a squeezing elastic body (4) (4) (4) (4) covered with a front and rear surfaces of the substrate (3) and having a hardness of 93 ° (JIS A). ) And. Further, the peripheral edge of the substrate (3) is provided with frame-shaped protrusions (5) (5) protruding to the front and rear sides, and these frame-shaped protrusions (5) (5) have annular recesses (6). ) (6) are provided respectively, and a sealing material (7) made of synthetic rubber, which is softer than the elastic body for compression (4), is housed inside each annular recess (6). The hardness of the sealing material (7) of this example is 65 ° (JIS A).

On the other hand, the ordinary filter plate (2) is provided with frame-shaped protrusions (15) and (15) projecting to the front and rear sides on its peripheral edge, and a large number of filtrate grooves are provided on the filter surface (16) at the center. (17) is provided.

Filter cloths (13) and (13) are covered on the front and rear surfaces of the squeezing filter plate (1) and the ordinary filter plate (2), respectively.

Each pressing elastic body (4) of the pressing filter plate (1) has a peripheral edge portion (4a) which is brought into contact with the frame-shaped convex portion (5) of the substrate (3).
Cover the central part of the substrate (3) and put the filtrate groove on the filtration surface (11).
It is composed of a filtering part (4b) having (12) and an inclined part (4c) along the inclined surface of the frame-shaped convex part (5) in the middle of both.

An annular convex portion (8) protruding toward the substrate (3) side is provided at a side edge portion of the peripheral edge portion (4a) of the compression elastic body (4), and the annular convex portion (8) is provided. Is partially fitted into the annular recess (6) from the outside of the seal material (7). In this embodiment, a concave portion (18) is provided in the longitudinal direction on the outer surface of the seal material (7), and the annular convex portion (8) on the compression elastic body (4) side is the seal material (7). It is fitted in the recess (18) of the.

As shown in detail in FIG. 2, the bottom surface (6a) of the annular recess (6) of each frame-shaped projection (5) of the substrate (3) is a vertical surface. Further, in the same figure, of the outer peripheral surface (6b) and the inner peripheral surface (6c) of the annular recess (6) facing each other vertically,
The outer peripheral surface (6b) is a tapered surface that is inclined downward toward the adjacent filter plate (2), while the inner peripheral surface (6b) is
c) is a horizontal plane. Therefore, the annular recess (6)
The inside is wider than the opening.

Also, the sealing material contained in the annular recess (6)
The outer peripheral surface (7b) of (7) is the outer peripheral surface (6) of the annular recess (6).
Corresponding to the shape of b), it has a similar tapered surface, and the inner peripheral surface (7c) of the sealing material (7) is the inner peripheral surface of the annular recess (6).
Corresponding to the shape of (6c), the surface is horizontal.

End face (14) of peripheral edge (4a) of elastic body (4) for compression
Has a similar tapered surface corresponding to the shape of the outer peripheral surface (6b) of the annular recess (6).

As described above, the outer peripheral surface (6b) of the annular recess (6) is a tapered surface which is inclined downward toward the adjacent filter plate (2), and the seal is correspondingly formed. The outer peripheral surface (7b) of the material (7) and the end surface (14) of the peripheral edge portion (4a) of the elastic body (4) for compression are formed into the same tapered surface by the so-called dovetail-shaped fitting. Sealant (7) and squeezing elastic
This is so that the peripheral edge portion (4a) of (4) is less likely to escape from the annular recessed portion (6).

Further, a concave surface (7a) having an arc-shaped cross section is provided on the side surface of the sealing material (7) on the substrate side so as to release the deformed portion of the sealing material (7) when the filtering plate is tightened. In the state before tightening 1), the concave surface (7a) of the sealing material (7) and the annular recess
A space (10) is formed between the bottom surface (6a) of (6).

A vertical step (9) is provided on each of the frame-shaped projections (5) of the squeezing filter plate (1) along the center of the annular plate (6) toward the filter plate. In the state before tightening (1), the step
A void (10) is formed between the (9) and the peripheral edge portion (4a) of the compression elastic body (4) facing the gap (10).

It should be noted that a concave surface (8a) having an arcuate cross section is provided at the tip of the annular convex portion (8) of the elastic body (4) for compression, and the filter plate
In the state before tightening (1), there is a gap (10) between the concave surface (8a) at the tip of the annular convex portion (8) and the bottom surface of the concave portion (18) of the seal material (7).
Are formed.

1 and 2 show a squeezing filter plate (1) and an ordinary filtering plate.
The state before tightening (2) is shown, and in this state, the annular concave portion (6) of each frame-shaped convex portion (5) of the press filter plate (1) is shown.
The sealing material (7) is not completely fitted in the inner part of the ring, and a part of it protrudes outward from the opening of the annular recess (6) and is outside the peripheral edge (4a) of the elastic body (4) for compression. The surface protrudes from the surface of the frame-shaped convex part (5) of the substrate (3) by the required height, and the surface of the peripheral edge part (4a) of the elastic body for compression (4) is the frame shape of the ordinary filter plate (2) side. The convex portions (15) are brought into contact with each other via the filter cloths (13) and (13) covered with the convex portions (15). In addition, the peripheral edge (4a) of the elastic body for compression (4)
Beyond the tapered end face (14) of the outside, there is a gap (5) between the frame-shaped protrusion (5) of the squeezing filter plate (1) and the frame-shaped protrusion (15) of the ordinary filter plate (2). 10) is formed, and the frame-shaped convex portion of the substrate (3) is formed.
A space (10) is formed between the stepped portion (9) provided in (5) and the peripheral edge portion (4a) of the compression elastic body (4) facing the stepped portion (9).

A filter chamber (20) is formed between the filter surfaces (11) and (16) covered with the filter cloths (13) and (13) of both filter plates (1) and (2). Has been.

Now, when the squeezing filter plate (1) and the ordinary filtering plate (2) are clamped together by a cylinder (not shown) provided in the loose head of the filter press, as shown in FIG. Peripheral part (4a) of the elastic body (4) for compression of the filter plate (1)
Are pressed against the base plate (3) of the squeezing filter plate (1) and the ordinary filter plate (2) adjacent to the base plate (3) so that the outer surface of the elastic body peripheral edge (4a) is
It is made almost flush with the surface of the frame-shaped convex part (5) of
The sealing material (7) made of soft rubber is pushed into the annular concave portion (6) by the peripheral edge portion (4a) of the elastic body for compression (4) and the annular convex portion (8). At this time, the peripheral portion of the elastic body for compression (4)
The inner surface of (4a) is pressed against the stepped portion (9) of the frame-shaped convex portion (5), and the sealing material (7) is the bottom surface (6a) and side peripheral surface (6b) of the annular recess (6). It can be attached closely to 6c).

As described above, when the filter plates (1) and (2) are tightened, the sealing material (7) is deformed by a constant tightening force,
The substrate (3) of (1) and the peripheral edge portion (4a) of the elastic body (4) for compression are securely sealed via the sealing material (7).

That is, the polypropylene resin, which is the material of the elastic body for compression (4), has a relatively high hardness and is hard, and the thickness of the peripheral edge portion (4a) of the elastic body for compression (4a) at the time of its manufacture is equal to that of the polypropylene resin. Even if the accuracy is poor, use this as an annular recess in the substrate (3).
(6) It can be absorbed by the sealing material (7) made of relatively soft rubber contained in the inside.

Therefore, when the filter plates (1) and (2) are tightened, the substrate (3) and the elastic body (4) for pressing are pressed at the peripheral edge of the press filter plate (1).
The peripheral edge part (4a) can be surely sealed with the sealing material (7), and it is pressed and filtered, especially 15 to 20 kg / cm ^2.
It is possible to reliably prevent the compressed fluid from leaking during high-pressure pressing due to such high pressure.

When the two filter plates (1) and (2) are tightened, the frame-shaped convex portion (1) of the press filter plate (1) outside the end face (14) of the peripheral edge part (4a) of the elastic body (4) for pressing. 5) and the frame-shaped convex part (15) of the ordinary filter plate (2), the void (10) disappears, and the adjacent filter plate is removed.
(1) The frame-shaped protrusions (5) (15) of (2) adhere to each other through the filter cloths (13) (13), and the stock solution and the filtrate are sealed. Also, along with this, the stepped portion (9) of the frame-shaped convex portion (5) of the substrate (3)
And the gap (10) between the peripheral portion (4a) of the elastic body for compression (4) facing this is also eliminated, and the inner surface of the elastic peripheral portion (4a) and the step (9) are Abutting each other, annular recess
(6) The sealing material (7) inside is not overloaded.

Then, in this state, a squeezing fluid is introduced between the substrate (3) and the squeezing elastic body (4) to squeeze the cake (not shown) in the filter chamber (20) to squeeze the squeezing fluid. , Annular recess
(6) The seal material (7) pushed into the inside of the recess (6) and brought into close contact with the inner surface of the recessed portion (6) can surely seal, and the leakage of the compressed fluid can be surely prevented. Moreover, such deformation of the sealing material (7) caused by pressing is within the elastic limit range that does not cause permanent set.
Even if the tightening of (1) and (2) is repeated, the peripheral edge part (4a) of the compression elastic body (4) can always be reliably sealed, and the compression filter plate (1) has excellent durability. .

FIG. 4 shows a second embodiment of the present invention. Here, the difference from the case of the first embodiment is that
An annular convex portion (8) relatively wide and protruding toward the substrate (3) side is provided along the side edge of the peripheral edge portion (4a) of the compression elastic body (4).

When tightening the filter plates (1) and (2), press the filter plate
At the peripheral edge of (1), the sealing material (7) made of soft rubber is pushed into the annular recess (6) by the inner surface of the peripheral edge (4a) of the elastic body for compression (4) and the annular protrusion (8). The inner surface of the annular recess (6) is tightly adhered, and the base plate (3) and the peripheral edge (4a) of the elastic body (4) for compression are securely sealed via the sealing material (7). is there.

FIG. 5 shows a third embodiment of the present invention. Here, the difference from the case of the first embodiment is that
A seal made of soft rubber, in which a wider annular projection (8) protruding toward the substrate (3) is provided along the side edge of the peripheral edge (4a) of the elastic body (4) for compression. The material (7) has a substantially rectangular cross section, and is arranged closer to the center of the filter plate than the annular projection (8), and the sealing material (7) is a peripheral edge of the elastic body excluding the wide annular projection (8). At the point facing the portion (4a) of the portion (4a), and before tightening the filter plate (1), the tip surface of the wide annular convex portion (8) and the annular concave portion (6) are Bottom (6a)
A gap (10) is formed between and.

When tightening the filter plates (1) and (2), press the filter plate
At the periphery of (1), the sealing material (7) has a wide annular projection.
The bottom surface (6a) and the inner peripheral surface of the annular recess (6) are pressed by the portion (4d) of the peripheral portion (4a) of the elastic body for compression excluding (8).
It is closely adhered to (6c), and the sealing action of the sealing material (7) is fulfilled.

FIG. 6 shows a fourth embodiment of the present invention. Here, the difference from the case of the first embodiment is that
A wide annular projection (8) is provided apart from the side edge of the peripheral edge (4a) of the elastic body for compression (4), and the sealing material (7) made of soft rubber has a substantially rectangular cross section. In addition to having the ring-shaped convex portion (8) arranged on the filter plate peripheral side, the sealing material (7),
Elastic body peripheral part (4a) part (4d) excluding wide annular convex part (8)
Between the tip of the wide annular convex portion (8) and the bottom surface (6a) of the annular concave portion (6) before the filter plate (1) is tightened. (10) is formed.

When tightening the filter plates (1) and (2), press the filter plate
At the periphery of (1), the sealing material (7) has a wide annular projection.
It is pressed by the part (4d) of the elastic body peripheral part (4a) excluding (8) and is brought into close contact with the bottom surface (6a) and the outer peripheral surface (6b) of the annular recess (6), and the sealing material (7) The sealing action is achieved by.

FIG. 7 shows a fifth embodiment of the present invention. Here, the difference from the case of the first embodiment is that
In the peripheral part (4a) of the elastic body for compression (4), two annular convex parts (8) protruding toward the substrate (3) side on both upper and lower sides excluding the central part.
(8) is provided, both ring-shaped protrusions (8) (8) A sealing material made of soft rubber having a substantially rectangular cross section in the middle between the two.
(7) is arranged, and the sealing material (7) is opposed to the portion (4d) of the elastic body peripheral portion (4a) between both annular convex portions (8) and (8). A concave groove (21) is further provided at the center of the bottom surface (6a) of the annular concave portion (6) of the frame-shaped convex portion (5) of the plate (1), and the concave groove (21) has a substantially rectangular cross section. At the point where a part of the sealing material (7) is fitted and before the filter plate (1) is tightened, the tip end surfaces of the two annular convex portions (8) (8) and the annular concave portion (6). The gaps (10) and (10) are formed between the bottom surface (6a) and the bottom surface (6a).

When tightening the filter plates (1) and (2), press the filter plate
At the peripheral edge of (1), the sealing material (7) has two annular protrusions.
(8) It is pressed by the part (4d) of the elastic body peripheral part (4a) except (8), and is brought into close contact with the bottom surface (6a) of the annular recess (6), and the sealing action of the sealing material (7) is exerted. It will be fulfilled.

FIG. 8 shows a sixth embodiment of the present invention. Here, the difference from the case of the first embodiment is that
The point is that the peripheral portion (4a) of the compression elastic body (4) is not provided with the annular convex portion (8).

Therefore, at the time of tightening the filter plates (1) and (2), the peripheral edge portion (4) of the elastic body (4) for compression is provided at the peripheral edge portion of the compression filter plate (1).
The sealing material (7) made of soft rubber is pushed into the annular recess (6) by the inner surface of (a), and is brought into close contact with the inner surface of the annular recess (6), so that the substrate (3) and the elastic body for compression ( 4) Perimeter
(4a) is surely sealed via the sealing material (7).

Since the other points of the second to sixth embodiments are substantially the same as those of the first embodiment, the same components are designated by the same reference numerals in the drawings.

In each of the above embodiments, the squeezing filter plate (1)
Substrate (3) The seal material (7) housed in the annular concave part (6) of the frame-shaped convex part (5) at the peripheral edge of the base plate (3) is designed to allow the deformed seal material (7) to escape. Concave surface with arcuate cross section (7a)
However, the cross-sectional shape of the seal material (7) is not limited to the one shown in the figure, and may be another shape such as a hollow shape.

Further, in the embodiment, the substrate (3) of the pressing filter plate (1)
The front and rear surfaces of the pressing elastic body (4) (4) are covered, but in the present invention, the pressing elastic body (4) is applied to one of the front and rear surfaces of the substrate (3). Is similarly applied.

Further, the embodiment shows a squeezing type filter press in which the squeezing filter plate (1) and the ordinary filtering plate (2) are alternately arranged. The invention is similarly applied to a squeezing type filter press in which only) are arranged in parallel, and a so-called compound type filter press in which squeezing filter plates and filter frames are alternately arranged.

[0052]

INDUSTRIAL APPLICABILITY As described above, the present invention provides a squeezing filter plate of a filter press including a substrate and an elastic body for squeezing covered on at least one of the front and rear surfaces of the substrate. Frame-shaped protrusions are provided on both sides, and a ring-shaped recess is provided in the frame-shaped protrusion on the side covered with the elastic body for compression. Inside the ring-shaped recessed portion, a softer elasticity than the elastic body for compression is provided. A sealing material consisting of a body is stored,
At the time of tightening the filter plate, the substrate and the peripheral portion of the elastic body for compression are hermetically sealed via a sealing material. Therefore, rubber or synthetic resin, which is the material of the elastic body for compression, has a relatively high hardness and is hard, and even if the accuracy of the thickness parallelism of the peripheral portion of the elastic body for compression is poor at the time of its manufacture, It can be absorbed by the sealing material made of an elastic body such as relatively soft rubber or synthetic resin housed in the annular concave portion of the substrate. It is possible to reliably seal the elastic body for use, and it is possible to surely prevent the leakage of the compressed fluid during compression filtration, especially during high-pressure compression.
Moreover, since the sealing material is not subjected to pressure more than necessary, the squeezing filter plate has an effect of excellent durability.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of the present invention and showing a state before tightening of a squeeze filter plate and a normal filter plate.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged cross-sectional view of the main part of the same, showing a partial cross-sectional view of the compressed filter plate and the normal filter plate when tightened.

FIG. 4 is an enlarged sectional view of an essential part showing a second embodiment of the present invention,
This corresponds to FIG.

FIG. 5 is an enlarged sectional view of an essential part showing a third embodiment of the present invention,
This corresponds to FIG.

FIG. 6 is an enlarged sectional view of an essential part showing a fourth embodiment of the present invention,
This corresponds to FIG.

FIG. 7 is an enlarged sectional view of an essential part showing a fifth embodiment of the present invention,
This corresponds to FIG.

FIG. 8 is an enlarged sectional view of an essential part showing a sixth embodiment of the present invention,
This corresponds to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 squeezing filter plate 2 ordinary filter plate 3 substrate 4 squeezing elastic body 4a peripheral part 5 frame-shaped convex part 6 annular concave part 7 soft sealing material 8 annular convex part

Claims (1)

[Claims] 1. A squeezing filter plate of a filter press comprising a substrate (3) and an elastic body (4) for squeezing which is covered on at least one of the front and rear surfaces thereof. Frame-shaped projections (5) (5) are provided on both sides, and a ring-shaped recess (6) is provided in the frame-shaped projection (5) on the side covered with the elastic body for compression (4). Inside the part (6), a sealing material (7) made of an elastic body that is softer than the elastic body (4) for compression.
When the filter plate (1) is tightened, the substrate (3) and the peripheral edge (4a) of the elastic body (4) for compression are sealed via a seal material (7) made of a soft elastic body. A squeezing plate of a filter press, which is designed to be hermetically sealed.