JPH08229323A - Porous ceramic filter, its production, extrusion die for producing porous ceramic filter and extruder using the die - Google Patents

Abstract

PURPOSE: To easily impart the function corresponding to a functional material by incorporating a functional material such as magnetic substance, catalyst, ion supplying and ion collecting materials into a porous ceramic filter formed by sintering fine particles. CONSTITUTION: A ceramic filter 10, which is hollow and cylindrical, is formed by sintering fine particles. The water such as pool water to be filtered flows in from the outer periphery 10a of the filter, passes through the thin-walled part 12 and flows out from the inner periphery 10b, and the impurities such as bacteria and oil are collected and recovered. The average diameter of the fine particles constituting such a ceramic filter 10 is continuously increased from the inflow face of the water to be treated toward the inside of the thick- walled part of the filter. Functional materials such as magnetic substance, catalyst, ion supplying or collecting material, dielectric, conductor and semiconductor are appropriately selected in accordance with the use and incorporated into the filter.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to removing these substances from a liquid containing impurities such as organic substances and inorganic substances, pollutant (harmful) substances, and offensive odors, and more particularly, tap water, river water, sea water, Pool water, to obtain clean drinking water or clean water by filtering these substances from water contaminated with organic substances and inorganic substances such as factory or domestic wastewater, or beer by filtering various solid substances and impurities, A high-performance, high-performance porous ceramic filter for producing wine, sake, soy sauce, sauce, juice, fruit juice, food oil, etc., and a method for producing the same, and an extrusion molding die used for producing the porous ceramic filter, and The present invention relates to an extrusion molding device including the same. The present invention also relates to a functionalized porous ceramic filter and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various filtering devices for filtering various pollutants, malodorous substances and impurities which are unsuitable for beverages in order to obtain drinking water from river water, sea water or waste water have been proposed and used. ing. In addition, recently, many water purifiers have been put on the market to remove offensive odors (unpleasant odors) and bad taste due to organic and inorganic substances contained in well water and tap water, and many of them are filtered. The device is in use.

[0003] On the other hand, when solid substances and impurities are removed from fermentation products such as when brewing beer, wine, sake, soy sauce, etc., and solid components are used to obtain sauces, juices, fruit juices, food oils, etc. from foods. Or when removing impurities,
The filtration process is also essential in the food industry. In particular, drinking water, liquor, fruit juice, juice, sauce, food oil, etc. are used for drinking or edibles, so the performance of the purification device is required to be extremely strict, and therefore the filtration used for this is required. The device is also required to have high performance.

Further, with the recent boom in fitness, more and more people are swimming for full-body exercises suitable for promoting health and relieving stress, and more and more people are familiar with the pool regardless of age or sex. Along with this, interest in swimming pool hygiene, especially water quality, is increasing in order to enjoy swimming safely and hygienically, and the requirements for purification equipment that determines the water quality of the pool are becoming more and more stringent. The performance of the filtering device used for this is also increasing.

Furthermore, recently, purification of water in zoos and aquariums, pretreatment for production of pure water for semiconductor production and desalination of seawater, quahouse, 24-hour bath, water treatment for tap water, decolorized water treatment according to environmental standards, etc. It is about to be used for water treatment in a wide range from high level to low level.

A porous ceramic filter is often used as a filtering material (element) of such a filtering device. A porous ceramic filter (hereinafter referred to as a ceramic filter) has three-dimensionally extremely fine filtration spaces (pores) which are preferable for filtration of pools, particularly hot water pools,
It is also possible to preferably filter organic substances such as oil released from the human body, tissues, proteins, bacteria, viruses, etc., which could not be sufficiently filtered by a conventional filter.

As a matter of course, the purification capacity of the ceramic filter is determined by the size of the micropores used for filtration. The smaller the pore size, the better the purification capacity. Further, considering the ease of cleaning by backwashing or the like, it is preferable that trapping of impurities and the like in the liquid to be purified is performed on the surface portion of the ceramic filter. Therefore, it is preferable that the inflow surface of the liquid to be purified is particularly dense in the ceramic filter. However, the ceramic filter is usually prepared by preparing a compound in which fine particles and a binder are kneaded, molding the compound into a predetermined shape by piercing the compound, and firing the molded product. It is not possible to manufacture a ceramic filter having such a structure.

In order to manufacture a ceramic filter having the above structure (the average particle size becomes smaller on the surface), a compound (slurry) composed of ultrafine particles having a smaller particle size was applied to the surface of a molded article and dried. It is also considered to produce a ceramic filter having a suitable particle size distribution in which the inflow surface of the liquid to be purified is particularly dense by performing a subsequent sintering to form a layer of ultrafine particles on the surface. However, this manufacturing method is very time-consuming and time-consuming, and the manufacturing cost of the ceramic filter is also high. Moreover, in order to sufficiently form the layer of ultrafine particles on the surface, it is necessary to repeat the application and drying of the slurry many times. Further, the ceramic filter thus manufactured has a two-layer or multi-layer structure as schematically shown in the vicinity of the surface in FIG. 9, and the base and the coating layer on the base are completely integrated. Absent. Therefore, the thin layer applied during backwashing or filtration is easily peeled off, and this peeling spreads, and as a result, the purifying ability of these parts is lowered and the desired purifying ability may be exhibited. However, there are various practical problems such as shortage of life and short life of the ceramic filter.

On the other hand, since the conventional ceramic filter is not as dense as the surface, if the ceramic filter is subjected to filtration without using a filter aid, impurities and the like will enter from the surface to the inner depth and become clogged. Therefore, cleaning (backwashing) becomes very difficult. Therefore, in a filtration device using a ceramic filter, a fibrous filter aid such as pulp fiber or asbestos, or a layer of particulate filter aid such as diatomaceous earth or lime, a so-called filter aid, is provided on the inflow surface of the filtered water of the filter. The agent layer is formed to make the surface of the filter dense so as to prevent the ceramic filter from being clogged and facilitate backwashing, which is troublesome.

In addition to the filtering action, the filter is desired to perform other functions such as heating, sterilization, control of specific components, pretreatment of special treatment such as pure water or seawater desalination. .

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. At least one surface, preferably the inflow surface of the liquid to be purified has the most dense surface portion, From this surface, the ceramic filter has an ideal particle size distribution in which the (average) particle size of the fine particles forming the ceramic filter continuously increases from the inside toward the thick part, and the cost such as raw material cost is low, Another object of the present invention is to provide a manufacturing method for easily manufacturing the filter, an extrusion molding die for manufacturing a porous ceramic filter used for manufacturing the ceramic filter, and an extrusion molding apparatus including the die.

Another object of the present invention is to provide a ceramic filter with a function according to the functional material by intentionally adding the functional material to the ceramic filter, a method of manufacturing the same, and this filter. It is an object of the present invention to provide an extrusion molding die for manufacturing and an extrusion molding apparatus equipped with this die.

[0013]

That is, the present invention provides a porous ceramic filter obtained by sintering fine particles, wherein the ceramic filter contains a functional material. To do. Here, the ceramic filter is a hollow cylindrical body, or
It is preferable that the tubular body has a central through hole and has a plurality of through holes extending in the same direction as the central through hole in a thick portion between the central through hole and the outer peripheral surface. That is, the present invention is a porous ceramic filter obtained by sintering fine particles, wherein the average particle diameter of the fine particles forming the porous ceramic filter is continuous from at least one surface toward the inside of the thick portion. A porous ceramic filter having a large size. In the present invention, the porous ceramic filter is a hollow cylindrical body, and the average particle diameter of the fine particles is continuous from the outer peripheral surface and / or the inner peripheral surface of the cylindrical body toward the inside of the thick portion. The present invention provides a porous ceramic filter that becomes larger in size. Furthermore, in the present invention, the porous ceramic filter has a central through hole, and a plurality of through holes extending in the same direction as the central through hole are provided in a thick portion between the central through hole and an outer peripheral surface. A cylindrical body having holes, wherein the average particle size of the fine particles forming the porous ceramic filter is at least one of the outer peripheral surface of the cylindrical body, the peripheral surface of the central through hole, and the plurality of through holes. Provided is a porous ceramic filter that continuously increases from any one, any two, or all surfaces selected from the peripheral surface toward the inside of the thick portion.

These ceramic filters preferably contain a functional material. As a functional material,
Any kind of material such as a magnetic material, a catalyst, an ion supply or trapping material, a dielectric material, a conductive material, or a semiconductor can be used as long as it can impart a predetermined function, and an electrode can be provided to apply electricity as needed. Is preferred.

According to the present invention, when a raw material compound containing raw material fine particles and a binder is prepared, the raw material compound is molded into a predetermined shape, and the molded product is sintered to produce a porous ceramic filter, Provided is a method for producing a porous ceramic filter, characterized in that molding is performed while applying ultrasonic vibration to at least one surface of the molded product. In the present invention, the molded product is a tubular body having at least one through hole, and the molding is performed while applying ultrasonic vibration to an outer peripheral surface of the molded product and / or at least one through hole peripheral surface. A method of manufacturing a porous ceramic filter is provided. Furthermore, in the present invention, the molded product has a central through hole, and a plurality of through holes extending in the same direction as the central through hole are provided in a thick portion between the central through hole and the outer peripheral surface. A cylindrical body having, the molding, any one selected from the outer peripheral surface of the molded product, the peripheral surface of the central through hole, and at least one peripheral surface of the through hole formed in the thick portion, Provided is a method for manufacturing a porous ceramic filter, which is performed while applying ultrasonic vibration to any two or all surfaces. The compound can include a functional material. As to the selection of the material, any kind may be added depending on the function to be imparted as described above.

In the above-described method for manufacturing a ceramic filter, it is preferable that the molded product of the ceramic filter extruded by the extruder be subjected to ultrasonic vibration while being compacted. By compacting this molded product, the entire molded product has a dense structure, and the ultrasonic vibration is applied to the surface of the dense structure to improve the transmission of ultrasonic vibrations. It is possible to obtain an ideal ceramic filter in which the particle size is smaller than the inside and the average particle size is continuously increased from the surface to the inner depth.

The present invention is an extrusion molding die used in connection with an extruder when manufacturing a porous ceramic filter, which is used for forming a molded ceramic filter article extruded by the extruder. Disclosed is an extrusion molding die for producing a porous ceramic filter, wherein an ultrasonic transducer is arranged at least at one location inside a die wall. Further, the present invention has at least one through hole.
A die for extrusion molding, which is used by being connected to an extruder when manufacturing a porous ceramic filter having a tubular body having two cavities, the cavity forming an outer wall of a ceramic filter molded product extruded by the extruder. A mold having, and at least one core removably mounted in the mold to form a through hole of the ceramic filter that is arranged to extend in the extrusion direction in a cavity of the mold, There is provided an extrusion molding die for producing a porous ceramic filter, wherein an ultrasonic transducer is arranged in the mold and / or at least one core. Furthermore, the present invention manufactures a porous ceramic filter having a central through hole and having a plurality of through holes extending in the same direction as the central through hole in a thick portion between the through hole and the outer surface. A die for extrusion molding used in connection with an extruder at the time of forming a mold having a space forming an outer space of a ceramic filter molded product extruded by the extruder, and forming the central through hole. A first core that is arranged in the space of the mold for extending in the extrusion direction, and is arranged between the inner wall surface of the mold and the first core for forming the plurality of through holes. Multiple second
A core, and at least one ultrasonic transducer is arranged in at least one element selected from the mold, the first core, and at least one second core. An extrusion molding die for manufacturing a porous ceramic filter is provided.

In the extrusion molding die for producing ceramics described above, a structure in which the space through which the molded product of the ceramic filter extruded by the extruder passes is squeezed from the base end to the end of the die, and means for compacting the molded product by this is provided. It is highly preferable to provide. The consolidating means may be formed by reducing the passing cavity of the molded product composed of the mold and the core, and as one specific example, gradually reducing the diameter of the mold portion and gradually expanding the diameter of the core. Is good. Any other structure may be used as long as it has the diaphragm structure.

Furthermore, the present invention provides an extrusion molding apparatus in which the above-mentioned die is connected to an extruder.

The porous ceramic filter of the present invention, the method for producing the same, the extrusion molding die for producing the porous ceramic filter, and the extrusion molding apparatus equipped with this die will be described in detail.

The present invention provides the following inventions. (1) Ceramic filter (1-a) Filter containing functional material (1-b) Filter with dense surface (1-c) Filter with dense surface and containing functional material (2) Ceramic filter Method of manufacturing the filter described in (1-a), (1-B) and (1-c) above. (3) Ceramic filter manufacturing die (4) Ceramic filter continuous manufacturing apparatus equipped with the above die

The porous ceramic filter of the present invention (hereinafter referred to as a ceramic filter) has extremely fine pores three-dimensionally formed by sintering fine particles and is discharged from the human body. It is a filter that can filter not only the oil and tissue that are generated but also impurities such as microorganisms such as viruses and bacteria. And, as described at the beginning of the specification, the filter is applicable in various industrial fields.

FIG. 1 is a schematic view showing one embodiment of a ceramic filter, (a) is a plan view and (b) is (a).
Bb line sectional drawing of each is shown. The ceramic filter 10 of the illustrated example is a hollow cylindrical body formed by sintering fine particles, and the ceramic filter 1 shown in FIG.
In the purification apparatus using 0, a liquid to be filtered (purified) such as pool water (= liquid to be purified, hereinafter referred to as unpurified water for convenience) is supplied to the outer periphery of the ceramic filter 10 and the outer periphery of the cylindrical body. It flows in from the surface 10a, passes through the thick portion 12, flows out from the inner peripheral surface 10b, and is recovered, or, conversely, is supplied to the center through hole 14 and flows in from the inner peripheral surface 10b to remove the thick portion 12. By passing through and collecting from the outer peripheral surface 10a, impurities to be removed such as bacteria and oil are trapped by the ceramic filter 10 and removed from the unpurified water, and finally the unpurified water is purified. .

In the ceramic filter of the present invention, the average particle size of the fine particles forming the filter is continuously increased from at least one surface, preferably from the inflow surface of unpurified water toward the inside of the thick portion of the filter. And a ceramic filter 10 of the illustrated example.
Is an example in which the average particle diameter of fine particles continuously increases from the outer peripheral surface 10a (surface layer surface) toward the inside of the thick portion 12. That is, it becomes finer as it approaches the outer peripheral surface. FIG. 2 schematically shows the change in the average particle size.

FIG. 2A is a partially enlarged view of the upper right portion of the ceramic filter 10, showing the ceramic filter 10.
2B, the average particle diameter of the fine particles constituting the element continuously increases from the outer peripheral surface 10a toward the inside. This is schematically shown in a graph in FIG. The curve of FIG. 2 (c) has a different slope according to various factors such as the particle size composition of the compound, the frequency of application of ultrasonic waves, and time, but it does not differ that the curve continuously increases from the surface 10a toward the inside. That is, in this aspect, the filtration space of the ceramic filter 10 is the outer peripheral surface 1
0a is the most dense, and has an integrated structure in which the average particle size increases continuously from the outer peripheral surface 10a toward the inside,
The ceramic filter 10 is suitably used for a purification device that supplies unpurified water from the outer peripheral surface 10a.

The ceramic filter 1 of the present invention as described above
0 is the inflow surface of unpurified water, that is, in the illustrated example,
Since the outer peripheral surface 10a is extremely dense and the filtration space can be configured to gradually expand in the flow direction of water,
Impurities are intensively trapped in the vicinity of the outer peripheral surface 10a, and a very high purification capacity can be exhibited. Furthermore, since the impurities are captured almost on the inflow surface of the unpurified water, the impurities once trapped by backwashing can be more easily and satisfactorily removed from the ceramic filter for cleaning, resulting in long-term cleaning. It is possible to realize a long-life ceramic filter that does not require replacement due to clogging, and it is possible to perform good cleaning efficiency and highly efficient operation associated with the cleaning effect. Moreover, by making the inflow surface of the unpurified water sufficiently dense, it is possible to eliminate the filter aid that was required in the conventional ceramic filter, and it is possible to further improve the operating efficiency of the purification device. it can.

Further, in the ceramic filter which performs the step of applying the slurry containing ultrafine particles to the surface of the above-mentioned molded body and sintering it, as shown in FIG. It has a multilayer structure such as a layer applied by slurry coating on top, the layers are not sufficiently integrated, the upper layer 92 is thin, and the particle size distribution is configured so as not to be gradual and continuous. As described above, the fine particle layer 92 on the surface is peeled off from the lower layer 90 due to the impact during the formation of the auxiliary agent layer and backwashing, and this is easily transmitted, which is a practical problem, as described above. The filter 10 has a continuous average particle size distribution structure as shown in FIG. 2 instead of a layer structure, and is integrally structured, so that the layer separation does not occur, and the filter 10 has a predetermined size. Ability of Can be expressed over a long period of time,
Also in this respect, a long-life ceramic filter can be realized.

The ceramic filter of the present invention has a basic structure in which the average particle size of the fine particles forming the filter continuously increases from the inflow surface of the unpurified water toward the inside, and therefore, In a hollow cylindrical ceramic filter such as the ceramic filter 10 of the illustrated example, the average particle diameter of the fine particles forming the filter is from the outer peripheral surface 10a and / or the inner peripheral surface 10b toward the inside,
It grows continuously.

For example, in another aspect, the average particle diameter of the fine particles forming the ceramic filter 10 continuously increases from the inner peripheral surface 10b toward the inside of the thick portion 12. That is, according to this aspect, the filtration space of the ceramic filter has the most dense inner peripheral surface 10b and continuously increases from the inner peripheral surface 10b toward the inside. It is suitable for use in a purifying device that supplies water.

Further, in another aspect, the average particle size of the fine particles forming the ceramic filter 10 continuously increases from both the inner peripheral surface 10b and the outer peripheral surface 10a toward the inside of the thick portion 12. That is, according to this aspect, the inner peripheral surface 10b and the outer peripheral surface 10a of the ceramic filter have the most dense filtering space, and the inner peripheral surface 10a and the outer peripheral surface 10a of the ceramic filter 10 continuously increase in size. It is preferably used when the unpurified water is selectively supplied from both of the center through hole 14a and the center through hole 14a.

FIG. 3 is a schematic view showing another embodiment of the ceramic filter of the present invention, in which (a) is a plan view and (b) is a plan view.
Shows respective sectional views taken along line bb. The above-described ceramic filter 10 shown in FIG. 1 is a hollow cylindrical body having the center through hole 14, but the ceramic filter 20 shown in FIG. 3 is as shown in FIGS. 3 (a) and 3 (b). In addition to the central through hole 44, a plurality of through holes 43 are provided in the thick portion 42 of the cylindrical body defined by the outer peripheral surface 42a and the inner peripheral surface 42b. In the illustrated example, the through hole 43
Are formed in the thick portion 42, and the cross-sectional shape thereof is an elliptical shape, but the number and shape are not particularly limited.

In addition to the central through hole 44, the ceramic filter 20 has a plurality of through holes 43 in the thick portion 42. Therefore, the illustrated ceramic filter 20
Can filter unpurified water by the following two methods. (1) The same kind or different kinds of unpurified water is caused to flow not only in the outer periphery of the ceramic filter 20 but also in the central through hole 44,
The same or different unpurified water is introduced from both the outer peripheral surface 42a and the inner peripheral surface 42b to collect the purified water from the through hole 43, or the unpurified water is supplied from the through hole 43 to supply the unpurified water to the through hole 43. By inflowing from the wall surface and distilling the purified water from both the outer peripheral surface 42a and the inner peripheral surface 42b, the treatment capacity can be greatly improved, and the purified water can be supplied to different places. (2) In this ceramic filter 20, the thick portion 4
The unpurified water is made to flow from the outer peripheral surface 42a of the No. 2 to collect the primary purified water in the through hole 43, and the primary purified water is further permeated through the ceramic filter and is made to flow out from the inner peripheral surface 42b to be collected from the central through hole 44. By supplying the unpurified water to the central through hole 44 in the opposite direction or by
By passing the unpurified water from b through the through hole 43 to the outer peripheral surface 42a, the unpurified water can be filtered in two stages, and the degree of purification of water such as pool water can be significantly improved.

Like the ceramic filter 10 described above, the ceramic filter 20 of the present invention is also made by sintering fine particles, and the average particle size of the particles forming the filter is such that the inflow surface of the unpurified water is The structure is dense and changes continuously toward the inside.

For example, in one aspect of the ceramic filter 20 according to the present invention, the average particle size of the fine particles forming the ceramic filter 20 is directed from both the outer peripheral surface 42a and the inner peripheral surface 42b toward the inside of the thick portion 42. It grows continuously. That is, in this aspect, the filtration space of the ceramic filter 20 has the outer peripheral surface 42 a and the inner peripheral surface 4.
2b is the most dense, and has a configuration in which it increases continuously from both surfaces toward the inside of the thick portion 42, that is, toward the through hole 43. Therefore, in this embodiment, the ceramic filter 20
The same or different unpurified water is supplied from the outer circumference and the central through hole 44 of the No. 1 to the unpurified water from both the outer peripheral surface 42a and the inner peripheral surface 42b, and the purified water is collected from the through hole 43 to the purifying device. It is preferably used.

In another aspect of the ceramic filter 20, the average particle size of the fine particles forming the ceramic filter 20 continuously increases from the wall surface of the through hole 43 toward the inside of the thick portion 42. That is, in this aspect, the filtration space of the ceramic filter 20 is the through hole 43.
Has the most dense wall surface, and has a configuration in which it continuously increases in the thick portion 42, that is, in the direction of the outer peripheral surface 42a and the inner peripheral surface 42b. Therefore, in this embodiment, the through hole 43
The unpurified water is supplied to the outer peripheral surface 4
It is suitable for use in a purifying device that causes purified water to flow out and be collected from 2a and the inner peripheral surface 42b.

Further, in another mode of the ceramic filter 20, the average particle size of the fine particles forming the ceramic filter 20 is from the outer peripheral surface 42a, the inner peripheral surface 42b and the wall surface of the through hole 43 to the inside of the thick portion 42. It becomes larger continuously. That is, in this aspect, the filtration space of the ceramic filter 20 has the outer peripheral surface 42a and the inner peripheral surface 42b.
Further, the wall surface of the through hole 43 is the most dense, and has a configuration in which it increases continuously from each surface toward the inside of the thick portion 42. Therefore, this aspect can be utilized so that unpurified water of the same kind or different kinds can be supplied from either the outer peripheral surface 42a and the central through hole 44 or the through hole 43.

In the ceramic filter 20 according to the present invention having the central through hole 44 and the through hole 43, in addition to these aspects, for example, either one of the outer peripheral surface 42a and the inner peripheral surface 42b is provided. From the unpurified water inflow surface of the ceramic filter 20 to the thick portion 42, such as a structure in which the average particle diameter increases from the inside to the inside, and only one surface in the radial direction of the ceramic filter 20 in the inner peripheral surface of the through hole 43 is dense. It is possible to use all configurations in which the average particle size of the fine particles forming the ceramic filter continuously increases toward the inside of the.

In addition to the ceramic filters 10 and 20 described above, the ceramic filter of the present invention may have, for example, a tubular structure having two or more through holes, or a plate-like shape. Ceramic filters, etc.
It can be suitably used for all ceramic filters having a known shape. Further, the ceramic filter of the present invention,
The average particle size of fine particles may be continuously increased from the entire surface of the surface having the ceramic filter toward the inside, and the average particle size may be continuously increased from a part of the surface to the inside. It may be Further, the continuous change of the average particle size may be in the entire depth direction (flow direction of water) of the ceramic filter, or may be in the middle of the depth direction to the inside.

Further, the ceramic filter may contain a functional material. For example, depending on the function to be imparted, when it is desired to impart conductivity, to impart dielectric property, to impart magnetism, or to supply or trap ions, to impart a catalytic action, etc. Contains a functional material. The electrodes can then be placed on or in connection with the ceramic filter, if desired. Note that in a ceramic filter that imparts functionality, the average particle size of the fine particles that form the filter does not necessarily have to increase continuously from at least one surface toward the inside, and even for filters that do not consider the particle size distribution. The present invention includes. That is, a filter having a conventional structure (for example, the one shown in FIG. 1) having functionality is included in the present invention. The one shown in FIG. 3 is also suitable.

Next, the functional material will be exemplified. (1) Insulation (high insulation) Alumina (Al ₂ O ₃ ), aluminum nitride (Al
N), diamond, etc. (2) Dielectric properties Zinc oxide, lithium niobate, strontium titanate (SrTiO ₃ ) and the like. (3) Conductivity Silicon carbide (SiC), molybdenum silicide (MoS)
i ₂ ), semiconducting barium titanate (BaTiO ₃ ), iron oxide, vanadium oxide, tin oxide, titania, copper oxide, zinc oxide, zinc oxide varistor, stabilized zirconia, β ″ -alumina, plating sand Such.

(4) Magnetic properties Zn-Mn-ferrite, SrO.6Fe ₂ O ₃ , acicular γ-iron oxide, etc. (5) Ion supply or trapping material A ceramic material which has been treated so as to be able to exchange ions, or which originally has ion exchangeability. (6) Catalyst Materials that perform oxidation, reduction, and other catalytic reactions.

For example, if the filter can be heated to a constant high temperature, the fluid can be heated and sterilized at the same time, and backwashing is easy. In that case, the conductive or dielectric material of (3) is used, and electrodes are provided in the filter so that electricity can be applied. In addition, with the material of (4), it is possible to remove a large amount of Mg and Ca in water, remove / decrease / increase Na and K, or remove heavy metals or coloring materials, which enables the production of pure water, desalination of seawater, and hardening of water. It can be used as various special water treatments such as water softening, selective addition addition of predetermined ions and reduction, or pretreatment of special water treatments. In order to return the ceramic filter that has captured ions, metals, etc. to the initial state, the eluent or exchange liquid may be passed in reverse, and the backwash in this application is simply backwash with water or pressurized air. Not only in the case but also in the case of backwashing so as to recover the functionality with a melt or an exchange liquid, it includes the operation of recovering the function at the start of use. Further, the filter can be air-baked as it is by applying an electric current for cleaning.

The ceramic filters of the present invention having the continuous change in average particle size from the inflow surface (at least one surface) of the unpurified water to the inside, including the ceramic filters 10 and 20 described above, are as follows. The method for producing a ceramic filter according to the present invention shown in (1) can be suitably and continuously produced in large quantities, particularly inexpensively. The method for producing a ceramic filter of the present invention (hereinafter referred to as a production method) basically uses a molding technique using fine particles as a raw material, such as extrusion molding or injection molding, and sinters the obtained molded product. The ceramic filter is manufactured by the method, but molding is performed while applying ultrasonic vibration to at least one surface of the molded product. By applying such vibration, smaller fine particles move to the vibration source side due to the difference in particle diameter of the raw material fine particles and the resulting weight difference. Therefore, the average particle size of the fine particles forming the ceramic filter (molded product) becomes smaller as the surface gets closer to the vibration, and the average particle size distribution shown in FIG. It is possible to produce the ceramic filter of the present invention with a very dense inflow surface. It is not always necessary to apply vibration when adding the above-mentioned functional material to the filter.

In such a manufacturing method of the present invention,
First, a raw material compound containing raw material fine particles and a binder is prepared. When imparting the above-mentioned functionality to the filter, the above-mentioned functional material is appropriately selected and added to the compound. There is no particular limitation on the type of raw material fine particles used in the production method of the present invention, that is, the fine particles forming the above-described ceramic filter 10 (20) of the present invention, and all of those used in known ceramic filters can be used. It is available. Specifically, aluminum oxide (alumina), zirconium oxide (zirconia), titanium oxide (titania), yttrium oxide, silicon oxide (silica), silicon carbide, silicon nitride, calcium silicate, aluminum silicate, corundum (steel ball), koji Illustrative examples include wright, mullite, and the like, and a complex formed by appropriately mixing two or more of these.

The particle size of the fine particles is not particularly limited,
The thickness may be appropriately selected according to the ability required for the ceramic filter, but is usually about 0.1 μm to 100 μm. In the present invention, utilizing ultrasonic vibration during molding,
Since a gradient distribution of the average particle size is formed in the water permeation direction of the thick part, it is not necessary to carefully arrange the particle sizes of the fine particles, and even if an inexpensive raw material having a large particle size width (particle size distribution) is used,
A high-performance ceramic filter can be realized.

Further, the binder is not particularly limited, and various kinds of binders used when producing a fine particle molded product by extrusion molding or injection molding can be used. Specifically, various alcohols, celluloses such as methyl cellulose and ethyl cellulose, starch, vinyl resins,
Examples include various waxes, thermoplastic polyolefins such as polyethylene and polypropylene, and polyvinyl acetate compounds. In addition to fine particles and binder, various additives such as lubricants such as propylene glycol, glycerin, stearic acid and its salts, and sintering aids such as silica, carbon, boron and magnesia are added to the raw material compound. Of course it is okay. The raw material compound may be prepared by a known method.

After preparing such a raw material compound, a molded product corresponding to the intended ceramic filter is produced by extrusion molding, injection molding or the like. Here, in the manufacturing method of the present invention, molding is performed while applying ultrasonic vibration to at least one surface of the molded product on which filtration is to be performed. Since the fine particles of the raw material of the ceramic filter are produced by crushing the raw material lump, all do not have a uniform particle size unless they are highly sized, and usually the particle size is It has a certain width, that is, a particle size distribution. The production method of the present invention is to mold a raw material compound while applying ultrasonic vibration to at least one surface of a molded product, and by applying ultrasonic vibration during or after molding, the difference in particle size and weight of the raw material fine particles is obtained. Depending on the difference, small particles in the raw material compound move to the vibration source side. Therefore, the average particle size of the fine particles forming the ceramic filter (molded product) continuously decreases as it approaches the surface to which vibration is applied. Ceramic filters having an average particle size distribution, as shown, can be manufactured.

Specifically, when the ceramic filter 10 according to the embodiment of the present invention shown in FIG. 2 is manufactured, ultrasonic vibration may be applied to the outer peripheral surface 10a during or after molding. Similarly in the following, during or after molding,
In the second mode, on the inner peripheral surface 10b, on the third mode, on the outer peripheral surface 10a and the inner peripheral surface 10b, and in the case of the ceramic filter 20 shown in FIG. 3, in the first mode, the outer peripheral surface 42a and the inner peripheral surface 42a. The peripheral surface 42 b, the wall surface of the through hole 43 in the second aspect, and the outer peripheral surface 42 in the third aspect.
It suffices to apply ultrasonic vibration to a, the inner peripheral surface 42b, and the wall surface of the through hole 43, respectively. However, it is preferable to apply the ultrasonic vibration while molding the ceramic filter.

Here, the ultrasonic waves refer to all the sound waves used for the change of an object or a substance, regardless of the frequency, without the purpose of listening (the ultrasonic waves issued by Nikkan Kogyo Shimbun). Refer to the latest hand-held ultrasonic technology etc. Therefore, the ultrasonic vibration in the present invention refers to vibration of all frequencies currently used as ultrasonic waves, specifically, vibration of about several kHz to 20 MHz. In the present invention, the frequency of ultrasonic vibration is appropriately determined according to the shape and particle size of the fine particles used, the type of binder, the viscosity of the compound, and the like.
Moreover, the time for applying ultrasonic vibration may be appropriately determined according to the particle size distribution of the raw material fine particles to be used. In addition, in an extruder and the like described later, this time can be approximated by a residence time from when the raw material compound is supplied to the molding die to when the molded product is discharged.

As a method of applying ultrasonic vibration to the corresponding wall surface of the molded body, a mold for injection molding or extrusion molding, or a portion corresponding to the wall surface to be vibrated of the core is
A method of arranging (embedding) the ultrasonic transducer is exemplified.

A molded product having an average particle size distribution gradient is produced in this manner and then sintered in the same manner as an ordinary ceramic filter to obtain the ceramic filter of the present invention.
The sintering method is not particularly limited, and known sintering such as pressureless sintering in an inert atmosphere, an oxidizing atmosphere, a reducing atmosphere, or reduced pressure (vacuum) sintering, uniaxial or isotropic pressure sintering, etc. Various methods are available. Further, the sintering conditions such as temperature, atmosphere, pressure and time are not particularly limited, and may be appropriately determined according to the type of raw material fine particles, binder and the like.

FIG. 4 is a schematic sectional view of the extrusion molding apparatus of the present invention for carrying out the above-described manufacturing method of the present invention, FIG. The cross section of line b is
7 is a sectional view taken along line cc in FIG. 7, and FIG. 8 is a view taken in the direction of arrow d. The extrusion molding machine of the present invention includes the ceramic filter extrusion molding die 50 (hereinafter referred to as the molding die 50) of the present invention, and an extruder 62 for extruding a raw material compound into the extrusion molding die 50. As the extruder 62, all known extruders used for extrusion molding machines such as a screw feeder, a single-screw or multi-screw extrusion kneader, and the like can be used.

The illustrated molding die 50 of the present invention is for manufacturing the ceramic filter 20 having the central through hole 44 and the plurality of through holes 43 shown in FIG. 3 described above. Basically, as shown,
It comprises a die part 52, a second die part 54, a third die part 56, a fourth die part 58, and a total of ten fifth die parts 60, 60 ... And has a substantially cylindrical shape.

The first die part 52 has a substantially cylindrical shape, and by a total of eight bolts 64, 64 ...
It is connected and fixed to the extruder 62. That is, the molding die 50 of the illustrated example is wholly connected to the extruder 62 by connecting the first die portion 52 to the extruder 62, and the raw material compound is the extruder 6 as shown by the arrow A.
2 to the first die part 52 through cavity (cavity)
52a. Incidentally, reference numeral 64a shown in FIG.
Is a screw hole into which the bolt 64 is screwed. like this,
The molding die 50 of the present invention can be detachably used as an attachment, and by preparing molding dies corresponding to ceramic filters of various shapes, it is possible to easily cope with the manufacture of many kinds of ceramic filters. It is possible.

The second die portion 54 basically has a cylindrical shape, and is connected and fixed to the downstream end surface of the first die portion 52 by a total of eight bolts 66. As shown in FIGS. 4, 6 and 7, ten beams 68, 68 ... Are stretched in the radial direction in the through cavity 54a of the second die portion 54, and the center of the through cavity 54a, that is, all The central columns 70 corresponding to the central through holes 44 of the ceramic filter 20 are provided at the tips of the beams 68, 68.
Is formed, and the central pillar portion 70 of each beam 68, 68.
And the inner wall surface of the second die portion 54 between the pillar portions 72, 72 corresponding to the through holes 43 of the ceramic filter 20.
Is formed. In the illustrated example, in order to secure the strength, the central pillar portion 70 and the pillar portion 72 are connected to each other by the beam 68, but the beam is not always necessary unless the strength of each pillar portion touches during the extrusion of the compound. Absent. FIG.
As shown in FIG. 5, the central pillar portion 70 and the pillar portion 72 slightly protrude from the second die portion 54 on the upstream side and enter the through cavity 52 a of the first die portion 52. The second die portion 54 is provided on the downstream side of the central pillar portion 70 and the pillar portion 72.
Penetration cavity 5 of third die portion 56 which projects further and is described later
6a, and extends to the vicinity of the downstream end surface (discharge portion) of the third die portion 56. The downstream end of the central pillar portion 70 is fixed to the fourth die portion 58, and the pillar portions 72, 72 ...
The downstream end of is fixed to the fifth die portion 60, 60 ...

The diameter of the cavity 56a of the third die portion 56 is
The diameter is gradually reduced in the downstream direction and has a substantially cylindrical shape having a through cavity 56a having a constant diameter in the vicinity of the discharge portion on the downstream side, and is fixed to the second die portion 54 by a bolt 80. The fourth die portion 58 is a columnar body having a shape corresponding to the center through hole 44 of the ceramic filter 20, and the downstream end of the center column portion 70 of the second die portion 54 is fixed and supported by two bolts 58a. . Further, the fifth die portions 60, 60 ... Are columnar bodies having a shape corresponding to the through holes 43 of the ceramic filter 20, and the downstream end of the column portions 72, 72. It is fixedly supported by 60a. In FIG. 8, the bolt 60a is omitted to simplify the drawing.

In such a molding die 50, the raw material compound is extruded from the extruder 62 into the molding die 50 in the direction of arrow A, supplied to the first die portion 52, and passed through the second die portion to the third die portion. It is discharged from the end face of the portion 56. At this time, the inner wall surfaces of the first die portion 52 to the third die portion 56, and the through cavity 54 a of the second die portion 54 and the through cavity 56 of the third die portion 56.
The central pillar portion 70 and the fourth die portion 58 corresponding to the central through hole 44 of the ceramic filter 20 arranged in a.
The pillar portion 72 and the fifth die portion 60 corresponding to the through hole 43 of the ceramic filter 20 are molded into a shape corresponding to the ceramic filter 20.

Therefore, in the molding die 50 of the illustrated example, the peripheral wall portions of the first die portion 52, the second die portion 54 and the third die portion 56 are ceramic filter 20.
Of the first core, the pillar portions 72, 72, ... And the sixth die portion 60, in which the central pillar portion 70 and the fifth die portion 58 form the central through hole 44 of the ceramic filter 20. , 60 ... Are second cores forming the through holes 43, 43 ... of the ceramic filter 20.

Here, an accommodating hole 71 is formed in the central column portion 70 of the second die portion 54 of the molding die 50, and an ultrasonic vibrator (ultrasonic vibration motor) held by a fixed pipe 82 is formed therein. 74 are arranged, and the accommodating holes 73 are equally spaced in the circumferential direction (4 mm) in the peripheral wall part 54 b of the second die part 54.
8 pipes are formed at intervals of 5 °, and fixed pipes 8 are formed here.
A total of eight ultrasonic transducers 76 held by No. 4 are arranged. The fixed pipes 82 and 84 also serve as a drive power source for the ultrasonic transducer and a cooling water supply line. It is preferable that these pipes are not passed through the cavities 54a, 56a through which the ceramic compound passes as much as possible.

By performing extrusion molding while driving each ultrasonic transducer, ultrasonic vibration is propagated inward from the surface of the ceramic filter and the inner peripheral surface of the second die portion 54, that is, The inner peripheral surface of the mold and the central column portion 70 of the second die portion 54, that is, the first core, are ultrasonically vibrated, and the surfaces corresponding to the respective ceramic filters 20, that is, the outer peripheral surface 42a and the inner peripheral surface 42b.
Is extruded under ultrasonic vibration.
As a result, as described above, the small particles move toward the vibration source side, that is, toward the outer peripheral surface 42a and the inner peripheral surface 42b, and the average particle diameter of the fine particles continuously increases from the outer peripheral surface 42a and the inner peripheral surface 42 toward the inside. It is possible to manufacture an enlarged ceramic filter of the present invention (its green molded product).

Similarly, the second ceramic filter 20 is manufactured by arranging ultrasonic transducers on the pillar portions 72, 72 ... And the sixth dies 60, 60. The third ceramic filter 20 can be manufactured by disposing the ultrasonic transducers on all of the mold, the first core, and the second core.

The type of ultrasonic transducer (electroacoustic transducer) that can be used is not particularly limited, and nickel, nickel-
Known ultrasonic waves such as magnetostrictive oscillators using chromium alloy, magnetostrictive ferrite, etc., electrostrictive oscillators using barium titanate, lead zirconate titanate, etc., piezoelectric oscillators using quartz, lithium sulfate, etc. All oscillators are available.

The arrangement position and the number of ultrasonic transducers are not limited to the illustrated example, and a plurality of transducers may be arranged on the central column portion 70, and they may be arranged on the peripheral wall portion 54b of the second die 54. The number of vibrators may be 7 or less, or 9 or more. It should be noted that the larger the number of vibrators, the better the formation of the change in average particle size, but the number of vibrators is appropriately determined according to the strength of the mold or core, the viscosity (fluidity) of the raw material compound, etc. do it. Further, in the illustrated example, the ultrasonic transducers are evenly arranged in the center of the first core and in the circumferential direction of the ceramic filter, but the present invention is not limited to this, and the ultrasonic transducers may be eccentric. It is also possible to reduce the average particle size at a specific position on the wall surface of the ceramic filter by arranging them or arranging a plurality of ultrasonic transducers at biased positions.

In the extrusion molding die 50 for producing a porous ceramic filter of the present invention, the ceramic material is extruded from the extruder 62 into the die 50 as shown by the arrow A, and is molded into a predetermined structure by the die 50 until extruded. It is preferable to provide a means for compacting the ceramics itself during the period. Although this consolidation is performed to some extent by ultrasonic waves, it is preferable to provide the die structure with a consolidation means in addition to this. In the die 50 of the present invention, the consolidating means has a cross-sectional area in a plane perpendicular to the extrusion direction of the extrusion passage (for example, the cavities 52a, 54a, 56a) through which the ceramic material extruded from the extruder 62 passes in the extrusion direction forward direction. It is preferable to make it smaller as it goes. That is, the extrusion passage is gradually or gradually converged or combined so as to be narrowed or converged in the extrusion direction so as to obtain a predetermined ceramic filter.

Such a compacting means is not always necessary depending on the ceramic filter to be obtained. For example, in the production of a ceramic filter that uses coarse particles and needs to have a coarse porous structure, this corresponds to the case where only molding is required after extrusion by an extruder. Alternatively, when the consolidation of the ceramic filter is completed at a separate place, the consolidation means is not necessary, and the molded product of the consolidated ceramic filter may be finally molded while applying ultrasonic vibration.

An example of the structure of the consolidation means will be described, but the configuration is not limited to this. In a preferred embodiment of the molding die 50 illustrated in FIG. 4, the central column portion 70 of the second die portion 54, that is, the first core, gradually and gradually expands in diameter in the extrusion direction, and the through cavity of the third die 56 is formed. 56a, that is, the mold has a configuration in which the diameter gradually and sharply decreases in the extrusion direction. With such a configuration, the molding pressure of extrusion molding can be increased, the density of fine particles in the molded product can be increased, and a ceramic filter having excellent mechanical strength can be realized. It should be noted that the second core may also be configured to gradually increase the diameter in the extrusion direction, if necessary.

The molding die 50 is a first die which can be separated from each other.
~ It is constituted by the fifth die part. Therefore, by exchanging each die part, various shapes,
It is possible to manufacture a ceramic filter (unsintered molded product) having a size. For example, the second die part 5
By exchanging the fourth, fourth die portion 58 and the fifth die portion 60, the size, position and shape of the central through hole 44 and the through hole 43 of the ceramic filter 20 can be changed, and the third die portion 56. The outer diameter and shape of the ceramic filter 20 can be changed by replacing the.

The molding die 50 described above manufactures the ceramic filter 20 shown in FIG. 3, but the second core, that is, the pillar portions 72, 72 ... And the sixth die portions 60, 60. By using an extrusion molding die having no ..., the first to third aspects of the present invention shown in FIG.
In other words, it is of course possible to manufacture a ceramic filter in the form of, that is, a hollow cylindrical shape.

The ceramic filter, the method for manufacturing the same, the extrusion molding die and the extrusion molding apparatus including the same according to the present invention have been described above in detail, but the present invention is not limited to the above-mentioned examples, and the gist of the present invention is not limited thereto. Of course, various changes and improvements may be made without departing from the scope.

[0070]

As described in detail above, the ceramic filter of the present invention has added functionality, and in addition to the functionality, the inflow surface of water is the most dense, and the average particle size is Since it changes continuously, it has a very high purification capacity, and since backlog cleaning is easy because most of the impurities are trapped on the ceramic filter surface,
In addition, there is no fear of delamination as in the case of rapid operation. further,
According to the manufacturing method and the extrusion molding apparatus of the present invention, such an excellent ceramic filter can be manufactured easily and with good efficiency.

[Brief description of drawings]

1A and 1B are conceptual views showing an example of a ceramic filter of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a sectional view taken along line bb.

2A is a partially enlarged view of the ceramic filter shown in FIG. 1, FIG. 2B is a view conceptually showing a change in average particle size of fine particles in the vicinity of the outer peripheral surface thereof, and FIG. 2C is this ceramic filter. It is the figure which made the graph the change of the average particle diameter of.

3A and 3B are conceptual views showing another example of the ceramic filter of the present invention, in which FIG. 3A is a plan view and FIG. 3B is a sectional view taken along the line bb.

FIG. 4 is a schematic sectional view of an extrusion molding machine of the present invention.

5 is an exploded view taken along line aa of FIG. 4. FIG.

6 is a cross-sectional view taken along the line bb of FIG.

7 is a sectional view taken along line cc of FIG.

FIG. 8 is a view in the direction of the arrow d in FIG.

FIG. 9 is a view conceptually showing the vicinity of the surface of a conventional ceramic filter.

[Explanation of symbols]

 10, 20 Ceramic filter 12, 42 Thick part 14, 44 Center through hole 43 Through hole 50 (Porous ceramic filter extrusion) molding die 52 First die portion 52a, 54a, 56a Through cavity 54 Second die portion 56 Third Die part 58 Fourth die part 60 Fifth die part 62 Extruder 70 Central column part 71,73 Storage hole 72 Column part 74,76 Ultrasonic transducer 82,84 Pipe 90 Molded body layer 92 Upper layer particle layer

Claims (42)

[Claims] 1. A porous ceramic filter obtained by sintering fine particles, wherein the ceramic filter contains a functional material. 2. The functional material is at least one selected from a magnetic material, a catalyst, an ion supplying material and an ion trapping material.
The porous ceramic filter according to claim 1, which is a seed. 3. The porous ceramic filter according to claim 1, wherein the functional material is a dielectric, a conductor or a semiconductor. 4. The porous ceramic filter according to claim 1, further comprising an electrode. 5. The porous ceramic filter according to claim 1, wherein the ceramic filter is a hollow cylindrical body. 6. The ceramic filter has a central through hole and a plurality of through holes extending in the same direction as the central through hole in a thick portion between the central through hole and an outer peripheral surface. The porous ceramic filter according to any one of claims 1 to 4, which is a tubular body. 7. A porous ceramic filter obtained by sintering fine particles, wherein the average particle diameter of the fine particles forming the porous ceramic filter is continuous from at least one surface toward the inside of the thick portion. Porous ceramic filter characterized by being large. 8. The porous ceramic filter is a hollow cylindrical body, and the average particle diameter of the fine particles is continuous from the outer peripheral surface and / or the inner peripheral surface of the cylindrical body toward the inside of the thick portion. The porous ceramic filter according to claim 7, which has a large size. 9. The porous ceramic filter is a tubular body having a plurality of through holes, and the average particle size of the fine particles is
The porous ceramic filter according to claim 7, wherein the cylindrical ceramic member continuously increases in size from the outer peripheral surface of the tubular body and / or the peripheral surface of at least one through hole toward the inside of the thick portion. 10. The porous ceramic filter has a central through hole, and a plurality of through holes extending in the same direction as the central through hole in a thick portion between the central through hole and the outer peripheral surface. And a mean particle size of the fine particles is
The porous ceramic filter according to claim 7, further increasing continuously from the peripheral surface of the central through hole toward the inside of the thick portion. 11. The porous ceramic filter has a central through hole, and a plurality of through holes extending in the same direction as the central through hole at a thick portion between the central through hole and the outer peripheral surface. The porous body according to claim 7, wherein the average particle diameter of the fine particles is continuously increased from at least one peripheral surface of the plurality of through holes toward the inside of the thick portion. Ceramic filter. 12. The porous ceramic filter has a central through hole, and a plurality of through holes extending in the same direction as the central through hole at a thick portion between the central through hole and the outer peripheral surface. And a mean particle size of fine particles forming a porous ceramic filter, wherein the outer diameter of the cylindrical body, the peripheral surface of the central through hole, and the circumference of at least one of the plurality of through holes. The porous ceramic filter according to claim 7, wherein the porous ceramic filter continuously increases from any one, any two or all of the surfaces toward the inside of the thick portion. 13. The porous ceramic filter according to claim 7, wherein the ceramic filter contains a functional material. 14. The functional material is at least one selected from a magnetic material, a catalyst, an ion supplying material and an ion trapping material.
The porous ceramic filter according to claim 13, which is a seed. 15. The porous ceramic filter according to claim 13 or 14, wherein the functional material is a dielectric, a conductor or a semiconductor. 16. The porous ceramic filter according to claim 13, further comprising an electrode. 17. A raw material compound containing fine raw material particles and a binder is prepared, the raw material compound is molded into a predetermined shape, and the molded product is sintered to produce a porous ceramic filter. And a method for producing a porous ceramic filter, which is performed while applying ultrasonic vibration to at least one surface of the molded product. 18. The molded product is a tubular body having at least one through hole, and the molding is performed while applying ultrasonic vibration to the outer peripheral surface of the molded product and / or the peripheral surface of at least one through hole. The method for manufacturing a porous ceramic filter according to claim 17. 19. The molded product has a central through hole, and has a plurality of through holes extending in the same direction as the central through hole in a thick portion between the central through hole and the outer peripheral surface. It is a cylindrical body, the molding, any one selected from the outer peripheral surface of the molded product, the peripheral surface of the central through hole, and at least one peripheral surface of the through hole formed in the thick portion, any The method for producing a porous ceramic filter according to claim 17, wherein ultrasonic vibration is applied to two or all of the surfaces. 20. The method of manufacturing a porous ceramic filter according to claim 17, wherein the compound contains a functional material. 21. The functional material is at least one selected from a magnetic material, a catalyst, an ion supplying material and an ion trapping material.
The method for manufacturing a porous ceramic filter according to claim 20, which is a seed. 22. The method for manufacturing a porous ceramic filter according to claim 20, wherein the functional material is a dielectric, a conductor or a semiconductor. 23. A raw material compound containing fine raw material particles and a binder is prepared, the raw material compound is molded into a predetermined shape, and the molded product is sintered to produce a porous ceramic filter. A method for producing a porous ceramic filter, wherein ultrasonic vibration is applied to at least one surface of the molded product, and the molded product is compacted. 24. The molded product is a cylindrical body having at least one through hole, and the molding is performed by applying ultrasonic vibration to the outer peripheral surface of the molded product and / or the peripheral surface of at least one through hole. The method according to claim 2, wherein the product is compacted.
4. The method for manufacturing the porous ceramic filter according to item 3. 25. The molded product has a central through hole and a plurality of through holes extending in the same direction as the central through hole in a thick portion between the central through hole and the outer peripheral surface. It is a cylindrical body, the molding, any one selected from the outer peripheral surface of the molded product, the peripheral surface of the central through hole, and at least one peripheral surface of the through hole formed in the thick portion, any The method for producing a porous ceramic filter according to claim 23, wherein ultrasonic vibration is applied to two or all of the surfaces and the molded product is consolidated. 26. The method of manufacturing a porous ceramic filter according to claim 23, wherein the compound contains a functional material. 27. The method for producing a porous ceramic filter according to claim 26, wherein the functional material is at least one selected from a magnetic material, a catalyst, an ion supplying material and an ion trapping material. 28. The method for manufacturing a porous ceramic filter according to claim 26, wherein the functional material is a dielectric, a conductor or a semiconductor. 29. A die for extrusion molding used in connection with an extruder when manufacturing a porous ceramic filter, the die wall for forming a molded article of the ceramic filter extruded by the extruder. An extrusion molding die for producing a porous ceramic filter, characterized in that an ultrasonic transducer is disposed at at least one of them. 30. A die for extrusion molding, which is used by being connected to an extruder when producing a cylindrical porous ceramic filter having at least one through hole, the ceramic being extruded by the extruder. A mold having a cavity forming an outer space of a filter molded product, and a mold removably mounted in the mold to form a through hole of the ceramic filter arranged in the cavity of the mold so as to extend in an extrusion direction. An extrusion molding die for producing a porous ceramic filter, comprising at least one core, and an ultrasonic transducer arranged on the mold and / or at least one core. 31. The extrusion molding die for producing a porous ceramic filter according to claim 30, wherein the core is removable or replaceable. 32. A porous ceramic filter having a central through hole and having a plurality of through holes extending in the same direction as the central through hole in a thick portion between the through hole and the outer surface is manufactured. A die for extrusion molding used in connection with an extruder at the time of forming a mold having a space forming an outer space of a ceramic filter molded product extruded by the extruder and for forming the center through hole. A first core that is arranged to extend in the extrusion direction in the mold space, and is arranged between an inner wall surface of the mold and the first core for forming the plurality of through holes. A plurality of second cores, the mold, the first core, and at least one second core
An extrusion molding die for producing a porous ceramic filter, wherein at least one ultrasonic transducer is arranged on at least one element selected from a core. 33. The extrusion molding die for producing a porous ceramic filter according to claim 32, wherein the first core and the second core are removable or replaceable. 34. A die for extrusion molding used in connection with an extruder when manufacturing a porous ceramic filter, the die wall for forming a molded article of the ceramic filter extruded by the extruder. An extrusion molding die for producing a porous ceramic filter, wherein an ultrasonic transducer is disposed at at least one of the locations, and a means for compacting the molded product is provided. 35. A die for extrusion molding, which is used by being connected to an extruder when producing a cylindrical porous ceramic filter having at least one through hole, the ceramic being extruded by the extruder. A mold having a cavity forming an outer space of a filter molded product, and a mold removably mounted in the mold to form a through hole of the ceramic filter arranged in the cavity of the mold so as to extend in an extrusion direction. A porous ceramic having at least one core, an ultrasonic transducer being arranged in the mold and / or at least one core, and having means for compacting the molded product. Extrusion molding die for filter manufacturing. 36. The consolidating means comprises a mold portion having a diameter gradually decreasing in the extrusion direction and at least one core portion having a diameter gradually increasing in the extrusion direction.
An extrusion molding die for producing the porous ceramic filter described in 1. 37. The extrusion molding die for producing a porous ceramic filter according to claim 34 or 35, wherein the core is removable or replaceable. 38. A porous ceramic filter having a central through hole and having a plurality of through holes extending in the same direction as the central through hole in a thick portion between the through hole and an outer surface is manufactured. A die for extrusion molding used in connection with an extruder at the time of forming a mold having a cavity forming an outer space of a ceramic filter molded product extruded by the extruder and for forming the center through hole. A first core disposed in the cavity of the mold so as to extend in the extrusion direction, and disposed between an inner wall surface of the mold for forming the plurality of through holes and the first core. A plurality of second cores, the mold, the first core, and at least one second core
An extrusion molding die for producing a porous ceramic filter, wherein at least one ultrasonic transducer is arranged in at least one element selected from a core, and a means for compacting the molded product is provided. 39. The compacting means comprises a mold portion having a diameter gradually reduced in the extrusion direction, and a first portion having a diameter gradually increased in the extrusion direction.
39. Extrusion die for producing a porous ceramic filter according to claim 38, comprising a core part and / or at least one second core part. 40. The extrusion molding die for producing a porous ceramic filter according to claim 38, wherein the first core and the second core are removable or replaceable. 41. An extruder for extruding a raw material compound containing raw material fine particles and a binder, and an extrusion molding die for producing a porous ceramic filter according to claim 29, which is attached to an extrusion port of the extruder. An extrusion-molding apparatus comprising: 42. An extruder for extruding a raw material compound containing raw material fine particles and a binder, and an extrusion molding die for producing a porous ceramic filter according to claim 34, which is attached to an extrusion port of the extruder. An extrusion-molding apparatus comprising: