JPH0938419A - Membrane type filter plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change the shape of a filtrate passage in a membrane type filter plate. SOLUTION: In a membrane type filter plate prepared by laminating diaphragm membranes 2 each consisting of an elastic material forming a recessed filter part-abutting part 2a and a seal abutting part 2b abutted on a peripheral seal part 1b on the periphery and fitted on a core plate 1 to which a recessed filter part 1a is provided in the center and the peripheral seal part 1b is formed in the periphery, nets 3 made of plastic are fixed, on the surfaces of at least the recessed filter part-abutting parts 2a of the diaphragm membranes 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called membrane filter plate provided with a diaphragm membrane (compressed membrane) for squeezing a cake (filter cake) formed on a filter cloth in a filtration operation by a filter press. Regarding

[0002]

2. Description of the Related Art In recent years, in the field of filtration as well, in order to save energy and labor, high dehydration of cake has been demanded,
Press type filter presses are becoming mainstream. The squeezing type filter press machine is designed and manufactured so that the sludge is press-fitted by a pump and the cake produced by the filtration operation is further squeezed by the diaphragm membrane provided in the filtration chamber.

This diaphragm membrane is made of natural rubber (NR).
A membrane main body is made of synthetic rubber, various engineering plastics, thermoplastic elastomers, etc., and a large number of ridge projections or grooves with irregularities are provided on the surface of the membrane main body to provide a passage for the filtrate. Is.

[0004]

In this diaphragm membrane, a passage for filtrate provided on the surface of the membrane body (in other words, a ridge projection or an unevenness provided on the surface of the membrane body) is fixed, and In order to change the flow passage for the filtrate so as to be suitable for the individual filtration operation conditions, it is necessary to prepare the same number of molds for forming the diaphragm membrane.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems by changing the shape of the filtrate passage without changing the diaphragm film forming die. , A core-shaped plate 1 having a hollow filtering portion 1a provided at the center and a peripheral sealing portion 1b at the peripheral edge, a hollow filtering portion abutting portion 2a, and a seal contact that abuts the peripheral sealing portion 1b at the peripheral edge In the membrane type filter plate in which the diaphragm membrane 2 made of an elastic material and having the portion 2b is overlapped and attached, the plastic net 3 is fixed to at least the surface of the hollow filtration portion contact portion 2a of the diaphragm membrane 2. It is in a membrane type filter plate characterized by being provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the membrane filter plate of the present invention, and FIG. 2 is a partial sectional view showing another example of the membrane filter plate of the present invention.

The membrane filter plate of the present invention is provided with a hollow filtering portion 1a at the center and a peripheral sealing portion 1b at the periphery.
A core plate 1 formed by forming a core plate having a substantially same shape as the core plate,
It is composed of a diaphragm membrane 2 made of an elastic material and having a hollow filtration portion contact portion 2a and a seal contact portion 2b.

The core plate 1 is made of polyethylene resin, polypropylene resin, or the like by press molding or extrusion molding to form a thick original plate having a rectangular shape or a shape close to the final product, and a hollow filtering portion 1a is provided in the center thereof. At the same time, a peripheral edge seal portion 1b is formed on the peripheral edge. An inflow hole for filtrate is provided at the central portion or an appropriate place.

The diaphragm membrane 2 comprises a membrane body and a plastic net 3. The membrane body has a flat plate-shaped hollow filter contact portion 2a having substantially the same shape as the hollow filter portion 1a of the core plate 1, and a seal contact portion 2b that contacts the peripheral edge seal portion 1b of the core plate 1. Made of elastic material.

The membrane body is made of natural rubber (NR), styrene rubber (SBR), ethylene propylene rubber (EPT).
It is formed by using synthetic rubber such as the above, further engineering plastic such as polyolefin or polyester, or thermoplastic elastomer.

The plastic net, which is attached to the surface of the membrane main body in a superposed manner, is a mesh of high density polyethylene, low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc., and has a mesh size of 4 mm. .About.8 mm, thickness 2 mm to 4 mm, and a net having a quadrangular or rhombic shape are preferably used.

To fix one or more of these plastic nets to the surface of the membrane body, an adhesive is interposed, thermocompression bonding is performed, and fasteners such as strings, wires, screws, and bolts are used. It is done by doing. When using a fastener such as a string, wire, screw, bolt, etc., if a hole is made in the membrane body, fill the hole from the core plate side, etc., and the filtrate will leak from this hole. Need not to.

In the example shown in FIG. 2, the net 3 is replaced with bolts 4 or the like.
And the backing material 22 is laminated on the back surface of the diaphragm film 2 to prevent the filtrate from leaking. The backing material 22 may be provided on the entire surface or partially. When it is provided over the entire surface, it is preferable to use the same material as that of the membrane body so as not to impair the flexibility and extensibility of the membrane body.

[0014]

According to the present invention, it is possible to form a filtrate passage of any shape by selecting the mesh shape of the plastic net to be fixed on the surface of the diaphragm film. Further, since it is not necessary to form irregularities on the surface of the diaphragm film, an extrusion molding method or the like can be adopted instead of the compression molding method using a mold, and there is also an effect of improving the productivity of the diaphragm film.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the membrane filter plate of the present invention.

FIG. 2 is a partial cross-sectional view showing another example of the membrane filter plate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 core plate 1a hollow filter part 1b peripheral seal part 2 diaphragm membrane 2a hollow filter contact part 2b seal contact part 3 plastic net

Claims (1)

[Claims] 1. A core plate 1 having a hollow-shaped filter portion 1a provided at the center and a peripheral edge seal portion 1b formed at the periphery, a core plate 1 having a hollow filter portion abutting portion 2a and the peripheral edge seal portion 1b at the periphery. In a membrane type filter plate in which diaphragm membranes 2 made of an elastic material and having seal contacting portions 2b in contact with each other are stacked and attached, at least the surface of the diaphragm-shaped filter contacting portion 2a of the diaphragm film 2 is made of a plastic net. Three
Membrane type filter plate characterized by being fixed.