JP4079533B2 - Ceramic molding body sealing method, ceramic molded body sealing apparatus, porous ceramic member manufacturing method, and ceramic filter manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is the production of a number of sealing methods of through holes longitudinally juxtaposed the columnar ceramic body, the ceramic molded body of the sealing device, the porous ceramic member using a sealing and ceramic molded bodies by the above sealing method The present invention relates to a method and a method for producing a ceramic filter using a porous ceramic member obtained by the above production method .
[0002]
[Prior art]
Recently, it has been a problem that particulates contained in exhaust gas discharged from internal combustion engines such as vehicles such as buses and trucks and construction machines cause harm to the environment and the human body.
Various ceramic filters that purify exhaust gas by collecting particulates in the exhaust gas by passing the exhaust gas through a porous ceramic have been proposed.
[0003]
In general, a ceramic filter 40 includes a plurality of porous ceramic members 30 as shown in FIG. Further, as shown in FIG. 5, the porous ceramic member 30 has a large number of through holes 31 arranged in parallel in the longitudinal direction, and a partition wall 33 that separates the through holes 31 functions as a filter.
[0004]
That is, in the through-hole 31 formed in the porous ceramic member 30, either the end portion on the inlet side or the outlet side of the exhaust gas is sealed by the filler 32, and the exhaust gas flowing into the one through-hole 31 is After passing through the partition wall 33 that always separates the through holes 31, the gas flows out from the other through holes 31, and when the exhaust gas passes through the partition wall 33, the particulates are captured by the partition wall 33, and the exhaust gas is exhausted. Is purified.
[0005]
Conventionally, when manufacturing such a porous ceramic member 30, first, a ceramic powder, a binder, and a dispersion medium liquid are mixed to prepare a mixed composition for manufacturing a molded body, By performing extrusion molding or the like, a columnar ceramic molded body in which a large number of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween is produced and cut into a predetermined length.
[0006]
Next, the obtained ceramic molded body is dried to disperse moisture, thereby obtaining a dried ceramic molded body having a certain strength and easy to handle, and subsequently, through holes of the ceramic molded body. The end portion is sealed with a sealing paste mainly composed of ceramic powder constituting the ceramic molded body.
Then, the porous ceramic member 30 was manufactured by baking the ceramic molded body.
[0007]
FIG. 6A is a sectional view schematically showing a conventional sealing device, and FIG. 6B is a partially enlarged sectional view showing a part thereof.
In the sealing step, conventionally, as shown in FIG. 6, a mask 21 in which openings 21a are formed in a sealing pattern is provided on a side surface, and a stirring piece 12 is provided therein, and the inside is a sealing port. The sealing process as described below was performed using the sealing paste discharge tank 20 filled with the paste 15 for use.
[0008]
When the ceramic molded body 1 moves to a portion where the sealing paste discharge tank 20 is installed through a predetermined conveyance path or the like, first, the mask 21 is moved by moving the sealing paste discharge tank 20. The ceramic molded body 1 is brought into contact with the end surface 1a. At this time, the opening 21a and the through-hole 2 part of the ceramic molded body 1 are in a positional relationship just opposite each other.
Subsequently, when the sealing paste 15 is stirred by moving the stirring piece 12 up and down while applying a slight pressure to the sealing paste 15, the sealing paste 15 flows, and the sealing paste 15 is opened in the mask 21. The sealing paste 15 penetrates into the end portion of the through hole 2 of the ceramic molded body 1.
When the filling of the sealing paste 15 is completed by the above process, the sealing paste discharging tank 20 is moved in the opposite direction to the initial direction, and the mask 21 is separated from the end face of the ceramic molded body 1 to complete the sealing process. .
[0009]
However, since the sealing paste 15 has a high viscosity, when the mask 21 is separated from the end face of the ceramic molded body 1, the sealing paste 15 is in a so-called stringing state, and as shown by A in FIG. Protrusions were formed on the end face, or downward sagging occurred as indicated by B.
[0010]
When protrusions and the like are formed on the end surface of the ceramic molded body 1, the protrusions are also formed as they are on the end surface of the fired porous ceramic member. That is, a plurality of porous ceramic members are then bundled and bonded, processed into the shape of the filter 40 shown in FIG. 4, and then the sealing material 42 is applied to the periphery thereof.
When applying the sealing material 42, a film is attached to the end surface portion so that the sealing material 42 does not adhere to the end surface of the filter 40, but if the protrusion is formed on the end surface, the film is completely adhered to the end surface. However, there was a problem that the sealing material 42 would flow into the end face portion.
[0011]
Furthermore, as shown by C in FIG. 7, when the sag of the sealing paste 15 is large, the sealing paste 15 flows into the other through-holes 2 of the ceramic molded body that should not be sealed and seals. There was also a problem.
[0012]
[Problems to be solved by the invention]
The present invention has been made to solve these problems, and seals through holes that should not be sealed without forming protrusions or sagging made of a sealing paste on the end surface of the ceramic molded body. A sealing method for a ceramic molded body that can be appropriately sealed without causing problems such as, a sealing device used for sealing the ceramic molded body, and a porous body using a ceramic molded body sealed by the sealing method It is an object of the present invention to provide a method for producing a porous ceramic member and a method for producing a ceramic filter using the porous ceramic member obtained by the above production method .
[0013]
[Means for Solving the Problems]
In the first aspect of the present invention, the end of the through-hole of the columnar ceramic molded body in which a large number of through-holes are arranged in parallel in the longitudinal direction with a partition wall therebetween is sealed with a sealing paste containing ceramic powder as a main component. A method of sealing a ceramic molded body, wherein a mask having openings formed in a sealing pattern is brought into contact with an end surface of the ceramic molded body, and then the sealing paste is removed from the openings of the mask. Ceramic molding, wherein the mask is pulled away from the end face of the ceramic molded body after the operation of reducing the cross-sectional area of the end face of the through-hole of the sealing paste is performed. It is a body sealing method.
[0014]
The second aspect of the present invention is a sealing paste containing ceramic powder as a main component at the end of the through-hole of a columnar ceramic molded body in which a large number of through-holes are arranged in parallel in the longitudinal direction across a partition wall. A method of sealing a ceramic molded body to be sealed, wherein a mask in which an opening is formed in a sealing pattern is brought into contact with an end surface of the ceramic molded body, and then the sealing paste is removed from the opening of the mask. Intruding into the through hole of the molded body, and then performing an operation of reducing the volume of the sealing paste in the vicinity of the end face of the through hole, and then separating the mask from the end face of the ceramic molded body. This is a method of sealing a ceramic molded body.
[0015]
Further, the third aspect of the present invention is a sealing paste containing ceramic powder as a main component at the end of the through-hole of the columnar ceramic molded body in which a large number of through-holes are arranged in parallel in the longitudinal direction across the partition walls. A sealing device for sealing, wherein a mask in which openings are formed in a sealing pattern is installed on a side surface and configured to be movable in an arbitrary direction, and the above-mentioned discharge tank The stirring piece arranged inside and the position inside the discharge tank a little away from the mask are arranged to face each opening and configured to move in the opening direction. A sealing apparatus for a ceramic molded body comprising a plurality of pins.
Moreover, 4th this invention is a manufacturing method of the porous ceramic member characterized by baking the ceramic molded object sealed by the sealing method of the ceramic molded object of 1st or 2nd this invention.
According to a fifth aspect of the present invention, there is provided a method for producing a ceramic filter, comprising binding a plurality of porous ceramic members produced by the method for producing a porous ceramic member of the fourth aspect of the invention.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a sealing method and a sealing device for a ceramic molded body of the present invention will be described with reference to the drawings.
[0017]
In the first aspect of the present invention, the end of the through-hole of the columnar ceramic molded body in which a large number of through-holes are arranged in parallel in the longitudinal direction with a partition wall therebetween is sealed with a sealing paste containing ceramic powder as a main component. A method of sealing a ceramic molded body, wherein a mask having openings formed in a sealing pattern is brought into contact with an end surface of the ceramic molded body, and then the sealing paste is removed from the openings of the mask. Ceramic molding, wherein the mask is pulled away from the end face of the ceramic molded body after the operation of reducing the cross-sectional area of the end face of the through-hole of the sealing paste is performed. It is a body sealing method.
[0018]
The ceramic molded body to be subjected to the sealing treatment in the first aspect of the present invention is formed with ceramic powder and a binder as main components, and after mixing these to prepare a mixed composition for manufacturing a molded body Then, after the extrusion of the mixed composition, etc., it is dried to produce a columnar ceramic molded body in which a number of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween.
[0019]
The ceramic powder is not particularly limited, and examples thereof include non-oxide ceramic powders such as silicon carbide, silicon nitride, aluminum nitride, boron nitride, titanium nitride, and titanium carbide; alumina, cordierite, mullite, silica, zirconia, Examples thereof include oxide ceramic powders such as titania.
Of these, silicon carbide, silicon nitride, aluminum nitride, etc., which are excellent in heat resistance, are preferable.
[0020]
The particle size of these ceramic powders is not particularly limited, but those having less shrinkage in the subsequent firing process are preferred. For example, 100 parts by weight of powder having an average particle size of about 0.3 to 50 μm and 0.1 A combination of 5 to 65 parts by weight of powder having an average particle diameter of about 1.0 μm is preferable.
[0021]
The binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
Usually, the amount of the binder is preferably about 1 to 10 parts by weight with respect to 100 parts by weight of the ceramic powder.
Examples of the dispersion medium liquid that imparts fluidity to the mixed composition include organic solvents such as benzene; alcohols such as methanol, water, and the like.
[0022]
In the first aspect of the present invention, first, a mask having an opening formed in a sealing pattern is brought into contact with the end face of the ceramic molded body, and the sealing paste is passed from the opening of the mask to the through hole of the ceramic molded body. To invade.
[0023]
The opening formed in the mask may have the same shape as the cross section of the through hole of the ceramic molded body to be sealed, or may have a smaller shape. By making the shape smaller than the cross-section of the through-hole, it becomes difficult to form protrusions and sagging, but if the opening is too small, the discharge amount of the sealing paste may be reduced, and sealing may not be complete.
Therefore, the shape of the opening is appropriately determined depending on the size of the through hole of the ceramic molded body, the viscosity of the sealing paste, and the like.
[0024]
The sealing paste is not particularly limited, but is preferably one that is easily integrated with the ceramic molded body when fired, is substantially the same component as the slurry used when producing the ceramic molded body, or Those in which a dispersion medium is further added to them are preferable.
[0025]
The method for allowing the sealing paste to enter the through-hole of the ceramic molded body from the opening of the mask is not particularly limited, and examples thereof include a method for allowing the sealing paste to enter by applying a certain amount of the sealing paste to the mask. However, as shown in FIG. 1 (a), a mask 11 is installed on the side surface, a stirring piece 12 is provided in the mask 11 and the inside thereof is filled with the sealing paste 15, and the sealing paste discharge tank 10 is filled therewith. Is preferable because the sealing efficiency is good.
[0026]
In this case, the method of allowing the sealing paste 15 to enter the end of the through-hole 2 from the opening 11a may be the same as in the conventional case, and the stirring piece 12 is moved up and down while applying a slight pressure to the sealing paste 15. By moving the sealing paste 15 to flow, the sealing paste 15 is discharged from the opening of the mask 11 and enters the end of the through hole 2 of the ceramic molded body 1.
[0027]
Thereafter, an operation of reducing the cross-sectional area (hereinafter also simply referred to as “paste cross-sectional area”) at the end face 1a of the through-hole 2 of the sealing paste 15 is performed.
Various methods are conceivable as operations for reducing the paste cross-sectional area. The first method includes an operation of shifting the mask along the end face of the ceramic molded body.
[0028]
FIG. 2A is a front view schematically showing a state after the mask is displaced along the end face 1a of the ceramic molded body 1, and FIG. 2B is a view when the state of FIG. It is a front view which shows an example, (c) is a front view which shows another example when the state of (a) is seen from the mask side.
As shown in FIG. 2B, the mask 11 is shifted upward, or the mask 11 is shifted obliquely upward as shown in FIG. The cross-sectional area, that is, the area of the overlapping portion between the opening 11a of the mask 11 and the end face of the through-hole 2 in FIGS.
[0029]
After that, when the mask 11 is pulled away from the end surface 1a of the ceramic molded body 1 while the paste cross-sectional area is reduced, the sealing paste 15 does not draw the excess yarn, and the projection is formed on the end surface portion of the ceramic molded body 1. Formation or drooping can be prevented.
In this method, the mask 11 can be shifted until the paste cross-sectional area after shifting the mask 11 decreases to about 50% of the paste cross-sectional area before shifting the mask 11.
[0030]
A second operation method for reducing the paste cross-sectional area is a method of using a pin and allowing the pin to enter the opening of the mask.
FIG. 3B is a cross-sectional view schematically showing a method of reducing the paste cross-sectional area using this pin.
As shown in FIG. 3B, first, as shown by the solid line, the pin 23a is arranged at a position facing the opening slightly apart from the opening 11a, and then, shown by the alternate long and short dash line. As described above, the pin 23a is allowed to enter the end surface 1a of the ceramic molded body 1 to reduce the paste cross-sectional area.
[0031]
After that, when the mask 11 is pulled away from the end surface 1a of the ceramic molded body 1 while the paste cross-sectional area is reduced, the sealing paste 15 does not draw the excess yarn, and the projection is formed on the end surface portion of the ceramic molded body 1. Formation or drooping can be prevented.
In this method, the pin 23a can be moved until the paste volume after the pin 23a is moved is 0% of the paste volume before the pin 23a is moved, that is, until the hole 11a is completely blocked.
[0032]
The shape of the pin 23a is not particularly limited. Further, the shape of the tip is not limited to the conical shape shown in FIG. 3B, but may be a curved shape such as a spherical shape or a cylindrical shape.
In FIG. 3B, the mask 11 is tapered, but such a taper may not be formed.
[0033]
According to the second aspect of the present invention, the end of the through hole of the columnar ceramic molded body in which a large number of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween is sealed with a sealing paste mainly composed of ceramic powder. A method of sealing a ceramic molded body, wherein a mask having openings formed in a sealing pattern is brought into contact with an end surface of the ceramic molded body, and then the sealing paste is removed from the openings of the mask. A ceramic molding characterized in that after the operation of reducing the volume of the sealing paste in the vicinity of the end face of the through hole is performed, the mask is pulled away from the end face of the ceramic molded body. It is a body sealing method.
[0034]
In the second aspect of the present invention, the shape of the ceramic molded body, the sealing paste, and the opening of the mask to be subjected to the sealing process may be the same as in the first aspect of the present invention.
Further, the method of allowing the sealing paste to enter the through hole of the ceramic molded body from the opening of the mask may be the same as in the first aspect of the present invention.
[0035]
Thereafter, in the second aspect of the present invention, an operation of reducing the volume in the vicinity of the end face of the through hole of the sealing paste (hereinafter also simply referred to as paste volume) is performed.
As an operation for reducing the paste cross-sectional area, for example, a method of using a pin and allowing the pin to enter the opening of the mask can be cited.
[0036]
3A to 3C are cross-sectional views schematically showing a method of reducing the paste volume using a pin.
As shown in FIGS. 3A to 3C, when the sealing paste 15 enters the through hole 2 from the opening 11a of the mask 11, first, as shown by the solid line, the pins 13a, 23a , 53a are arranged at positions away from the opening 11a, and then the pins 13a, 23a, 53a are inserted into the opening 11a of the mask 11 as shown by the alternate long and short dash line to reduce the paste volume. FIG. 3A shows a state in which the volume V inside the opening 11a decreases. However, the present invention is not limited to this volume V, and it is sufficient that the volume related to stringing can be reduced. As in the case of the first aspect of the present invention, the shape of the pin tip is not particularly limited.
[0037]
Thereafter, when the mask 11 is pulled away from the end surface 1a of the ceramic molded body 1 while the paste volume is reduced, the sealing paste 15 does not draw any excess yarn, and a protrusion is formed on the end surface portion of the ceramic molded body 1. Or dripping can be prevented.
[0038]
According to a third aspect of the present invention, the ends of the through holes of the columnar ceramic molded body in which a large number of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween are sealed with a sealing paste mainly composed of ceramic powder. A sealing device for sealing, in which a mask having openings formed in a sealing pattern is installed on a side surface and configured to be movable in an arbitrary direction, and inside the discharge tank A plurality of stirring pieces disposed at positions slightly apart from the mask inside the discharge tank, facing each opening, and configured to move in the opening direction. A sealing device for a ceramic molded body comprising a pin.
[0039]
The shape of the ceramic molded body, the sealing paste, and the opening of the mask, which are the objects of the ceramic molded body sealing device of the present invention, are the same as in the case of the ceramic molded body sealing method.
Fig.1 (a) is sectional drawing which shows typically the sealing apparatus of the ceramic molded body of this invention, (b) is the partial expanded sectional view which shows a part of said sealing apparatus.
The sealing paste discharge tank 10 is provided with a pin support 13b that supports and fixes a plurality of pins 13a, and the pins 13a can move in the direction of the opening 11a of the mask 11. Other than that, the configuration is the same as that of the conventional sealing paste discharge tank 20 shown in FIG.
[0040]
These pins 13a are arranged at positions slightly apart from the mask 11 inside the sealing paste discharge tank 10 so as to face the respective apertures 11a, and as described above by moving the pin support 13b. In addition, the pin 13 a moves in the direction of the opening 11 a of the mask 11.
[0041]
The sealing method using the sealing device of the present invention is a sealing method using the sealing method of the first and second aspects of the present invention.
That is, in the same manner as in the conventional sealing device, the mask 11 installed in the sealing paste discharge tank 10 is brought into contact with the end surface 1a of the ceramic molded body 1 and a little pressure is applied to the sealing paste 15 while stirring pieces. 12, the sealing paste 15 is stirred and discharged from the opening of the mask 11, and the end portion of the through hole 2 of the ceramic molded body 1 is filled with the sealing paste 15.
[0042]
Subsequently, by moving the pin support 13b, the pin 13a is moved in the direction of the opening 11a of the mask 11, and the pin 13a is intruded into the end surface 1a of the ceramic molded body 1 to reduce the paste cross-sectional area, Alternatively, the pin 13a is inserted into the opening 11a of the mask 11 to reduce the paste volume.
Thereafter, the sealing paste discharge tank 20 is moved as it is, and the mask 11 is separated from the end face of the ceramic molded body 1 to complete the sealing step.
By performing the sealing process using the sealing device of the present invention, it is possible to prevent the protrusion of the sealing paste from being formed on the end face of the ceramic molded body 1 or the sagging.
The operation of shifting the mask along the end face of the ceramic molded body can be performed using the sealing paste discharging apparatus 10 of the third aspect of the present invention or using the conventional sealing paste discharging apparatus 20.
[0043]
The sealing device for a ceramic molded body according to the present invention includes a control device incorporating a microcomputer, receives a control signal from the control device, and moves the ceramic molded body and paste paste tank 10 for sealing, The movement of 20, the movement of the pin support 13b, etc. can be automatically performed.
[0044]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.
[0045]
Example 1
70 parts by weight of α-type silicon carbide powder having an average particle diameter of 30 μm, 30 parts by weight of β-type silicon carbide powder having an average particle diameter of 0.28 μm, 5 parts by weight of methylcellulose, 4 parts by weight of a dispersant, and 20 parts by weight of water are uniformly mixed. The mixed composition of the raw materials was prepared by mixing.
This mixed composition was filled in an extruder and a ceramic molded body was produced at an extrusion speed of 10 cm / min. This ceramic molded body had a size of 50 mm × 50 mm × 300 mm, the number of through holes was 324, and the length of one side of the through holes was 1.5 mm.
[0046]
Next, using the sealing paste discharging device shown in FIG. 1, using the pin having the shape shown in FIG. 3 (b), the sealing paste was made to enter the end of the through hole of the ceramic molded body, and then the pin Was made to enter the opening to reduce the paste cross-sectional area to 70%, and then the mask was pulled away from the end face of the ceramic molded body to complete the sealing process.
[0047]
After that, the ceramic molded body after the sealing treatment is dried, and the percentage of the dried paste for sealing projects 0.5 mm or more from the end face of the ceramic molded body with respect to the number of through-holes subjected to the sealing treatment. (Hereinafter referred to as the protrusion ratio).
As a result, the protrusion rate was 30%.
[0048]
Example 2
The same ceramic molded body as in Example 1 was used as the ceramic molded body to be sealed. Further, as the sealing paste discharging device, the sealing paste discharging device 10 shown in FIG. 1 is used, and after the sealing paste 15 has entered the end of the through hole 2 of the ceramic molded body 1, the mask 11 is moved diagonally upward. After shifting the paste cross-sectional area to 60%, the mask 11 was pulled away from the end face 1a of the ceramic molded body 1 to complete the sealing process.
Then, as a result of measuring the protrusion ratio in the same manner as in Example 1, the protrusion ratio was 25%.
[0049]
Example 3
The same ceramic molded body as in Example 1 was used as the ceramic molded body to be sealed. Further, as the sealing paste discharge device, the sealing paste discharge device 10 shown in FIG. 1 is used, and the pin 13a having the shape shown in FIG. After penetrating the end of the through hole 2 of the pin, the pin 13a is penetrated into the opening 11a, and the volume (V) of the opening 11a of the mask 11 shown in FIG. The mask was pulled away from the end face of the ceramic molded body, and the sealing process was completed.
Then, as a result of measuring the protruding rate in the same manner as in Example 1, the protruding rate was 20%.
[0050]
Comparative Example 1
The same ceramic molded body as in Example 1 was used as the ceramic molded body to be sealed. Further, as the sealing paste discharge device, the conventional sealing paste discharge device 20 shown in FIG. 6 is used. After the sealing paste 15 has entered the end of the through hole 2 of the ceramic molded body 1, the mask 21 is simply used. The sealing process was performed by the conventional method of pulling apart from the end surface 1a of the ceramic molded body 1.
Then, as a result of measuring the protruding rate in the same manner as in Example 1, the protruding rate was as large as 50%.
[0051]
【The invention's effect】
Since the ceramic molded body sealing method of the first and second inventions is as described above, the ceramic molded body should not be sealed without forming protrusions or sagging made of a sealing paste on the end face of the ceramic molded body. The sealing process can be appropriately performed without causing a problem such as sealing the through hole.
[0052]
Further, since the sealing device of the ceramic molded body of the present invention is as described above, by using this sealing device, without forming protrusions or sagging made of a sealing paste on the end surface of the ceramic molded body, Sealing processing can be performed appropriately without causing problems such as sealing through-holes that should not be sealed.
[Brief description of the drawings]
1A is a sectional view schematically showing a sealing device for a ceramic molded body of the present invention, and FIG. 1B is a partially enlarged sectional view showing a part of the sealing device.
2A is a cross-sectional view schematically showing a method for sealing a ceramic molded body of the present invention, and FIGS. 2B and 2C are views schematically showing a method for sealing a ceramic molded body of the present invention. FIG.
3A to 3C are cross-sectional views schematically showing a method for sealing a ceramic molded body of the present invention.
FIG. 4 is a perspective view schematically showing a ceramic filter.
5A is a perspective view schematically showing a porous ceramic member, and FIG. 5B is a cross-sectional view taken along line AA in FIG. 5A.
6A is a cross-sectional view schematically showing a conventional sealing device for a ceramic molded body, and FIG. 6B is a partially enlarged cross-sectional view showing a part of the sealing device.
FIG. 7 is a cross-sectional view schematically showing a state that becomes a problem when a conventional ceramic molding body sealing method is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ceramic molded object 1a End surface 2 Through-hole 3 Partition 10 Sealing paste discharge tank 11 Mask 11a Opening hole 12 Stirring piece 13a, 23a, 53a Pin 13b Pin support 15 Sealing paste 30 Porous ceramic member 31 Through-hole 32 Filler 33 Bulkhead 40 Ceramic filter

Claims (7)

  A ceramic molded body sealing method in which a plurality of through-holes are arranged in parallel in the longitudinal direction across a partition wall, and the end portions of the through holes are sealed with a sealing paste mainly composed of ceramic powder. Then, after contacting the mask formed with an opening in the shape of a sealing pattern on the end surface of the ceramic molded body, the paste for sealing enters the through hole of the ceramic molded body from the opening of the mask, Next, after the operation of reducing the cross-sectional area of the end surface of the through hole of the sealing paste is performed, the mask is separated from the end surface of the ceramic molded body.   A ceramic molded body sealing method in which the end of the through hole of a columnar ceramic molded body in which a large number of through holes are arranged in parallel in the longitudinal direction across a partition wall is sealed with a sealing paste mainly composed of ceramic powder. Then, after contacting the mask formed with an opening in the shape of a sealing pattern on the end surface of the ceramic molded body, the paste for sealing enters the through hole of the ceramic molded body from the opening of the mask, Next, after the operation of reducing the volume of the sealing paste in the vicinity of the end face of the through hole is performed, the mask is separated from the end face of the ceramic formed body.   The method for sealing a ceramic molded body according to claim 1, wherein after the sealing paste is made to enter the through hole of the ceramic molded body from the opening of the mask, an operation of shifting the mask along the end surface of the ceramic molded body is performed.   3. The method for sealing a ceramic molded body according to claim 1 or 2, wherein after the sealing paste is made to enter the through-hole of the ceramic molded body from the opening of the mask, the pin is inserted into each opening of the mask.   A sealing device for sealing the end of the through-hole of a columnar ceramic molded body in which a large number of through-holes are arranged in parallel in the longitudinal direction across a partition wall with a sealing paste mainly composed of ceramic powder. A sealing paste discharging tank configured so that a mask in which openings are formed in a sealing pattern is installed on the side surface and movable in an arbitrary direction; and a stirring piece disposed inside the discharging tank; And a plurality of pins arranged to be opposed to the respective apertures at positions slightly apart from the mask inside the discharge tank and configured to be movable in the aperture direction. A sealing device for a ceramic molded body. A method for producing a porous ceramic member, wherein the ceramic molded body sealed by the sealing method according to claim 1 is fired. A method for producing a ceramic filter, comprising binding a plurality of porous ceramic members produced by the production method according to claim 6.

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