JP2008030469A - Manufacturing method of grain encapsulation honeycomb structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a grain encapsulation honeycomb structure in which the grain encapsulation honeycomb structure in which the deposition of the deposit to the end surface is reduced when used for a filter or the like can be easily manufactured at a low cost in a manner that the homogenization of the encapsulation depth especially, the grain encapsulation depth by the slurry grain encapsulation member in the honeycomb structure periphery is easily uniformized. <P>SOLUTION: In the manufacturing method of the grain encapsulation honeycomb structure in which the grain encapsulation section is formed in one open end of a predetermined cell of a cylindrical honeycomb structure 15 in which two or more cells 16 which serve as a channel of a fluid by a porous bulkhead are partitioned in a honeycomb shape, a grain encapsulation component 12 formed in a desired shape and inserted into a cell 16 passage in which the grain encapsulation is carried out includes a plastic material which presents a viscous fluidity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a plugged honeycomb structure. Furthermore, when used in a filter or the like, the production of a plugged honeycomb structure capable of producing a plugged honeycomb structure with reduced deposit accumulation on its end face easily and at low cost Regarding the method. More specifically, the present invention relates to a method for manufacturing a plugged honeycomb structure capable of easily uniformizing the plugging depth of the honeycomb structure.

  In recent years, in various fields including chemical, electric power, steel, and industrial waste treatment, as a filter for dust collection used for environmental measures such as pollution prevention, product recovery from high temperature gas, etc., heat resistance, A plugged honeycomb structure made of ceramic having excellent corrosion resistance is used. For example, such a plugged honeycomb structure is used as a dust collection filter used in a high temperature, corrosive gas atmosphere such as a diesel particulate filter (DPF) that collects particulates discharged from a diesel engine. It is used suitably (for example, patent document 1).

  As shown in FIG. 5, the plugged honeycomb structure used as a dust collecting filter as described above has a cylindrical shape having a porous partition wall 22 that defines a plurality of cells 24 serving as fluid flow paths. A honeycomb structure 23 and a plugging member 26 that plugs one opening of a predetermined cell and plugs the other opening of the remaining cells are provided. In the plugged honeycomb structure 21 shown in FIG. 5, the plugging members 26 plug the inlet side end surfaces B and the outlet side end surfaces C of the plurality of cells 24 alternately.

  The plugged honeycomb structure 21 as described above is obtained by obtaining a cylindrical unfired honeycomb structure having porous partition walls that define a plurality of cells serving as fluid flow paths by extrusion molding. A plugging slurry containing ceramic is formed in one opening of a predetermined cell of the obtained unfired honeycomb structure or the honeycomb structure obtained by firing the unfired honeycomb structure and the other opening of the remaining cells. It can manufacture by baking after filling.

  Furthermore, as a method for manufacturing a plugged honeycomb structure used as a dust collecting filter as described above, for example, an adhesive sheet or the like is attached to one end face of a honeycomb formed body that is an unfired ceramic dried body. , Forming a mask by punching only the portion corresponding to the cell to be plugged (plugged cell) such as the adhesive sheet by laser processing using image processing, etc., and forming the honeycomb with the mask attached The end face of the body is immersed in a slurry (ceramic slurry), the plugging cells of the honeycomb formed body are filled with the slurry to form a plugged portion, and the same process is performed on the other end face of the honeycomb formed body In addition, there has been proposed a method of obtaining a plugged honeycomb structure by drying and firing (see, for example, Patent Document 1).

JP 2001-3000922 A JP 2005-270755 A

  The manufacturing method of the plugged honeycomb structure as described above is required to uniformly plug with a slurry-like plugging member containing a ceramic slurry in order to make the depth of the plugged portion uniform. ing. Therefore, it is necessary to level the liquid level of the slurry-like plugging member in the container containing the slurry-like plugging member containing the ceramic slurry. However, even in the step of leveling the liquid level of the slurry-like plugging member, the slurry-like plugging member escapes to the side surface of the honeycomb structure at the outer periphery of the honeycomb structure. The problem that the depth of the plugged portion by the sealing member tends to be shallow has not been solved.

  As a result of intensive studies focusing on the composition of the plugging member of the honeycomb structure, the present inventor is a method for easily uniforming the depth of the plugged portion in the honeycomb structure. Providing a simple plugging method that eliminates the need for leveling the liquid level of the slurry-like plugging member in a container containing a stopper and allows the depth of the plugging portion to be easily uniformized and adjusted. The present invention has been achieved as a problem to be solved.

  In order to achieve the above object, the present invention provides the following method for manufacturing a plugged honeycomb structure.

[1] A plug in which a plugged portion is formed at one open end of a predetermined cell of a tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the method for manufacturing a sealed honeycomb structure, the plugging member formed in a predetermined shape to be inserted into the cell passage to be plugged includes a plastic material exhibiting viscous fluidity. A method for manufacturing a honeycomb structure.

[2] The method for manufacturing a plugged honeycomb structure according to [1], wherein the plugging member includes a heat-foamable resin and / or a water-absorbing resin.

[3] The method for manufacturing a plugged honeycomb structure according to [1] or [2], wherein the plugging member includes a gel-like substance.

[4] The plugging member according to any one of [1] to [3], wherein the plugging member contains at least one of gelatin, agar, tofu, konjac, starch, and silica gel. A method for manufacturing a stationary honeycomb structure.

[5] The plugging member is expanded by heating or water absorption after the plugging member reaches a predetermined position in the cell passage, whereby the plugging portion is fixedly formed in the cell passage. The method for manufacturing a plugged honeycomb structure according to any one of [1] to [4].

[6] After placing the plugging member on the holding part of the fixed mold having the holding part corresponding to the predetermined plugging pattern, the plugging member is pressed against the end surface of the honeycomb structure, thereby plugging the member. Is inserted into the end portion of the cell passage to be plugged to form a plugged portion. The method for manufacturing a plugged honeycomb structure according to any one of the above [1] to [5].

[7] The eye according to any one of [1] to [6], wherein the plugging member is inserted in the middle of the cell passage to be plugged to form a plugging portion. A method for manufacturing a sealed honeycomb structure.

The production method of the present invention has the following effects.
That is, the plugging member contains a plastic material exhibiting viscous fluidity, a polymer material that increases in volume by heating and / or addition, and a gel-like substance, whereby the cell passage of the honeycomb structure of the plugging member Insertion into the inside becomes easy, and after insertion, the plugging member is expanded by heating and heating, and the plugging member is easily fixed in the honeycomb cell passage. With these actions, the depth of the plugged portion can be easily made uniform, and at the same time, the depth of the plugged portion due to the slurry-like plugged member at the outer peripheral portion of the honeycomb structure is likely to be shallow. Can solve the problem. In addition, the depth of the plugged portion can be easily adjusted.

  Hereinafter, referring to the specific embodiments of the present invention shown in FIGS. 1 (a), (b) and (c) to FIGS. 4 (a) and 4 (b), the method for manufacturing the plugged honeycomb structure of the present invention will be described. Although the present invention will be described in detail, the present invention is not construed as being limited thereto, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention. It can be added.

  The plugging member used in the present invention is produced by adding a plastic material exhibiting viscous fluidity to the ceramic powder for slurry. A plastic material that exhibits viscous fluidity is a substance that has plasticity among synthetic resins, plastics, synthetic polymers, natural polymers, and inorganic polymers, and exhibits viscous fluidity as it is or when heated or hydrolyzed. Say. For example, a thermoplastic resin can be mentioned. The thermoplastic resin generally means a resin that becomes soft when heated to a glass transition temperature or a melting point and can be molded into a desired shape, and is easily fluidized by heating. For example, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, acrylic resin, and the like can be given.

  Furthermore, the plugging member used in the present invention preferably contains a heat-foamable resin and / or a water-absorbing resin. The heat-foamable resin and / or water-absorbent resin refers to a polymer material whose volume expands due to heat swelling, heat foaming, water absorption swelling, and the like. Examples thereof include a water-absorbing polymer material, a heat-foamable polymer material, and a wettable polymer material.

  The water-absorbing polymer generally means a polymer that has a property of absorbing and expanding in a short time when it comes into contact with liquid water, and can absorb 100 to 1000 times as much water as its own weight. Exists. In particular, a polymer in which 1 g of powder absorbs 1 liter of water instantaneously and gels due to its own weight and exhibits fluidity and plasticity may be referred to as a highly water absorbent resin.

  The water-absorbing polymer has the property of absorbing water to swell and hydrogel. Swelling generally refers to a phenomenon in which a gel absorbs a liquid and increases its volume. For example, when it swells with water, water molecules enter between the macromolecules, It is understood that the elasticity of the crosslinked mesh is balanced.

  As the water-absorbing polymer, alkaline hydrolyzate of starch-acrylonitrile copolymer, sodium acrylate-functional monomer copolymer, starch-sodium acrylate copolymer, carboxymethylcellulose, vinyl alcohol-acrylic acid copolymer And alkali saponified products of polyacrylic acid.

  The heat-foamable polymer is a thin hollow resin spherical shell that contains a gas and has a property that the resin spherical shell expands due to the expansion of the gas when heated at 100 to 200 ° C. Examples of the polymer material that increases in volume by heating and increases in volume include polystyrene, styrene-ethylene copolymer, polyurethane, and urethane-ethylene copolymer.

  Furthermore, the plugging member used in the present invention is generated by adding a gel-like substance. A gel generally refers to a state in which colloidal particles are aggregated and solidified with independent mobility. Preferred examples of the gel-like substance include gelatin, agar, tofu, konjac, starch, and silica gel. In the present invention, these substances can be used alone for a plugging member or in combination. Among these substances, gelatin, agar, starch, and silica gel are preferred because a certain quality product can be obtained industrially. For example, gelatin is swollen by water and dispersed from a gel state by heating or dissolving in warm water to form a sol. Gelatin sols flow viscously but solidify upon cooling to form gels.

  In the present invention, a fixed mold having a holding portion corresponding to a predetermined plugging pattern is formed. As shown in FIGS. 1A, 1B, and 1C, the fixed mold 11 may have a single plate-like body in which a recess 14 is formed, or in FIGS. 2A, 2B, and 2C. As described above, the cavity 4 may be formed between the two plate-like bodies 2 and 3. When the plugging member is fixed to the fixed mold, the plugging member can be fixed in a solidified state by the gel-like substance contained in the plugging member, so that it can be easily pushed into a desired cell. When the plugging member is press-fitted into the cells of the honeycomb structure, by heating, for example, the gel-like substance contained in the plugging member can be given fluidity. A predetermined plugging portion is easily formed by press-fitting into a predetermined position of the cell of the structure.

  In the present invention, the plugging member is fixed not only at the cell passage entrance but also at a predetermined position in the cell passage. For example, due to the flow of the plugging member by heating, for example, mechanical insertion by a push-up rod, for example, compression of the polymer resin that increases the volume of the plugging member, It is fixed at a predetermined position inside the cell. Accordingly, the depth of the plugged portion can be easily made uniform, and at the same time, the depth of the plugged portion can be easily adjusted.

  A tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls is manufactured, for example, by the method described in Patent Document 2. For example, a cylindrical unfired honeycomb structure having porous partition walls that form a plurality of cells serving as fluid flow paths can be obtained by extruding a forming raw material containing ceramic. The molding raw material containing ceramic is preferably a ceramic powder such as cordierite, mullite, alumina, spinel, silicon carbide, silicon nitride, lithium aluminum silicate, aluminum titanate, etc., kneaded with a binder or dispersion medium added. Can be used. Although there is no restriction | limiting in particular as a method of extrusion molding, For example, conventionally well-known methods, such as extrusion molding using a vacuum extrusion molding machine, can be used.

  Hereinafter, with respect to the steps of the present invention, the formation of the plugging member on the fixed mold and the entry into the cells of the honeycomb structure will be described with reference to FIGS. 1 (a), (b), and (c) to FIGS. The press-fitting will be described.

  FIGS. 1A, 1B, and 1C are schematic views showing a process of press-fitting into a honeycomb cell after a plugging member is arranged in a fixed mold. In FIGS. 1A and 1B, reference numeral 11 denotes a fixed mold. The plugging member 12 (12a, 12b) is fixed to the fixed mold 11, and the shape thereof is a plugging member 12a having a sharp tip as shown in FIG. As the plugging member 12b, it is particularly desirable that the tip is narrow because it is easier to press fit into the cell. The plugging member 12 fixed to the fixed mold 11 is pressed into the cell 16 by pressing the end face of the honeycomb structure 15 as shown in FIG.

  2A, 2B, and 2C show an example in which the fixed mold 1 includes a lower mold 2 and an upper mold 3, and a cavity 4 is formed. As shown in FIGS. 2 (a) and 2 (b), the cavity 4 is connected to the plugging member storage portion 6 by a tubular portion 5 in which the fixed die 1 is provided in the lower die 2. Then, as shown in FIG. 2A, the plugging member 7 passes through the tubular portion 5 from the plugging member reservoir 6 to the cavity 4 in the fixed mold 1 by pressurization, and the cavity 4 in the fixed mold 1 is pressed. The plugging member 7 is formed. Next, as shown in FIG. 2B, the plugging member 7 is fixed on the lower mold 2 of the fixed mold 1 by removing the upper mold 3 of the fixed mold 1. Next, as shown in FIG. 2 (c), the plugging member 7 fixed to the fixed mold 1 presses the end face of the honeycomb structure 8 so that the plugging member 7 is press-fitted into the cell 9, and the end face It is plugged with a part.

  FIGS. 3A and 3B show an embodiment in which a plugging member 35 disposed on a fixed mold 34 is press-fitted into a cell 37 of a honeycomb structure 36 and plugged inside the cell 37. ing. In this embodiment, the plugging member 35 is pushed up to a predetermined position in the cell 37 passage by the push-up bar 33 by mechanically pushing up the push-up bar holding plate 32. Then, when the plugging member 35 reaches a predetermined position in the cell 37 passage, water-absorbing polymer resin in which the water supplied to the plugging member 35 through the push-up bar 33 is added to the plugging member 35 is used. Is absorbed and swells to expand the plugging member 35, whereby the plugging member 35 is fixed and plugged inside the cell 37. When the heat-foamable resin is added to the plugging member 35, the plugging member 35 is heated to a predetermined temperature or more when the plugging member 35 reaches a predetermined position in the cell 37 passage. As a result, the plugging member 35 is fixed inside the cell 37 and plugged.

  4 (a) and 4 (b) show another embodiment in which plugging is performed inside the cells of the honeycomb structure 44, similarly to FIGS. 3 (a) and 3 (b). In this embodiment, an example in which the plugging pushing means pushes in with a pressurized fluid such as pressurized air is shown. The plugging member 43 disposed on the fixed mold 42 is pushed to a predetermined position in the cell passage of the honeycomb structure 44 by the pressurized fluid 46 stored in the fluid storage part 41. Also in this case, when the plugging member 43 reaches a predetermined position in the cell 47 passage, water is supplied to the pressurized fluid 46 to swell the water-absorbing polymer resin added to the plugging member 43. By expanding the plugging member 43, the plugging member 43 is fixed inside the cell 47 and plugged. Further, when the heat-foamable resin is added to the plugging member 43, the plugging member 43 is heated to a predetermined temperature or higher when the plugging member 43 reaches a predetermined position in the cell 47 passage. As a result, the plugging member 43 is fixed inside the cell 47 and plugged.

  The method of mechanically pushing in the plugging member using a push-up bar or the method of pushing in with a pressurized fluid such as pressurized air can be applied not only to press-fitting into the cell but also to fixing at the cell passage inlet. Can do. The plugging member can be fixed at a predetermined position of the cell by adjusting the pressure of the push-up bar, the addition of water to the water-absorbing polymer resin, and the heating of the heat-foamable resin.

  The plugging member can also be used in a state covered with a thin resin. In this case, when the plugging member reaches a predetermined position in the cell passage, the plugged portion is formed inside the cell by eluting the resin covered by heating.

  In the present invention, the type of ceramic powder for slurry used for the plugging member is not particularly limited, and for example, the same ceramic powder contained in a forming raw material for extruding the honeycomb structure is used. You may use different things.

  In the practice of the present invention, ceramic powder, for example, cordierite powder, which is kneaded by adding a binder or a dispersion medium, can be suitably used as a slurry-like plugging member. For example, a plugging member can be prepared by adding water, a binder, and glycerin to cordierite powder.

Further, the honeycomb structure of the embodiment of the present invention has a cylindrical shape in which a plurality of cells that have porous partition walls and serve as fluid flow paths are defined by the partition walls. The material of the honeycomb structure of the present invention is any one selected from the group consisting of cordierite, silicon carbide, alumina, mullite, aluminum titanate, and LAS (lithium aluminum silicate) from the viewpoint of strength, heat resistance, and the like. The seed is preferably the main crystalline phase. If the slurry of the slurry-like plugging member is made the same as that of the honeycomb structure, there is an effect that the thermal expansion coefficients of both coincide. The honeycomb structure has a circular cross-sectional shape (bottom shape) perpendicular to the central axis, but may be, for example, an ellipse, an oval, a polygon such as a quadrangle, an irregular shape, or the like. Further, the cross section of the cell (the cross section perpendicular to the axial direction of the honeycomb structure) is not particularly limited and is preferably a quadrangle, but may be a polygon such as a triangle or a hexagon. Further, the porosity and average pore diameter of the partition walls are not particularly limited, and may be any porosity and average pore diameter in a ceramic that can be used for exhaust gas treatment or the like. The thickness of the partition wall is not particularly limited, but if the partition wall thickness is too thick, the pressure loss when the fluid permeates may increase, and if it is too thin, the mechanical strength may be insufficient. There is. The thickness of the partition wall is preferably 100 to 1000 μm, and more preferably 200 to 800 μm. The cell density is not particularly limited, but is preferably 5 to 300 cells / cm ² , more preferably 10 to 100 cells / cm ² , and 15 to 50 cells / cm ^2. Particularly preferred.

  Although there is no restriction | limiting in particular as a method of drying a plugging member, For example, the method of mounting on a hotplate etc. and drying, the hot air drying which blows and dries with a hot air, etc. can be mentioned. Moreover, microwave drying, far-infrared drying, electric heater drying, etc. can also be used.

  The obtained plugged honeycomb structure precursor is fired to obtain a plugged honeycomb structure. The method for firing the plugged honeycomb structure precursor is not particularly limited, and can be performed in accordance with a firing step in a conventionally known method for manufacturing a plugged honeycomb structure. According to such a method for manufacturing a plugged honeycomb structure, for example, when used in a dust collection filter or the like, a plugged honeycomb structure in which the accumulation of deposits on the end surface thereof is reduced is simple and easy. It can be manufactured at a low cost.

  Further, in the method for manufacturing a plugged honeycomb structure of the present embodiment, an end face sealing member made of a combustible substance can be used. In this case, the end face sealing member may be eliminated when the plugged honeycomb structure precursor is fired. By comprising in this way, it is not necessary to remove an end surface sealing member, Therefore A manufacturing process can be simplified. In particular, when the end face sealing member disappears by firing, the end face sealing member is preferably composed of a flammable substance that disappears at the time of firing without disappearing or deforming during drying, For example, an end face sealing member made of polyvinyl chloride or the like can be cited as a suitable example.

  In the method for manufacturing a plugged honeycomb structure of the present embodiment, a mask can be used. In this case, when the plugged honeycomb structure precursor is fired, the mask covering the openings of the cells other than the predetermined cells may be eliminated. If it does in this way, the process which removes a mask can also be skipped by making an end surface sealing member and a mask lose | disappear at the time of baking simultaneously, and a manufacturing process can be simplified.

  In the method for manufacturing a plugged honeycomb structure of the present embodiment, a catalyst is provided on the inner surface of the partition wall and / or the inside thereof with respect to the plugged honeycomb structure obtained by the above-described method. It may be supported. For example, when a plugged honeycomb structure is used as the DPF, it is preferable to support a catalyst having a function of promoting the combustion of deposits (particulate matter) trapped in the partition walls. Preferred examples of such a catalyst include noble metal-based Pt, Pd, Rh and the like, and non-metallic perovskite-type catalysts. The method for supporting the catalyst can be performed according to the conventional method for supporting the catalyst on a filter such as DPF.

  EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited to these Examples.

(Example 1)
Using cordierite-forming raw materials mainly composed of talc, kaolin, and alumina as molding raw materials, water and binders are mixed, dispersed, mixed, and kneaded, and the raw materials are extruded into a cylindrical shape by a kneader. Extrusion molding by a molding machine, extrusion molding using a die having a cell structure of a square cell of 12 mil / 300 cpsi (0.30 mm / 46.5 (cell / cm ² )) and a cell pitch of 1.47 mm to form a molded body Got. Next, both end surfaces of the obtained molded body were alternately plugged, dried and fired to obtain a honeycomb structure with an outer wall. Then, plugging was performed by the method shown in FIGS. 1A, 1B and 1C using the obtained honeycomb structure with an outer wall.

  As the plugging material, the same cordierite-forming raw material is used as the main raw material of talc, kaolin and alumina as the honeycomb structure, and water, polyethylene, heat-foamable resin and water-absorbing resin are added to 100 parts by weight of raw material. On the other hand, 20 parts by weight of water, 10 parts by weight of heat-foamed resin, 0.5 parts by weight of water-absorbing resin, 0.5 parts by weight of polyethylene are added, and a small amount of methylcellulose, glycerin, and surfactant are added to the mixture. A plugging material was obtained.

  A large number of round plugging members 12 are molded by press-fitting and filling the plugging material having plasticity with a molding plate having the same round depression as a fixed mold having a large number of round depressions. With the plugging member removed and the plugging member fitted into the fixed mold, the plugging member is inserted into the cell by pressing the honeycomb structure into the cell. Formed. Thereafter, by drying the plugging portion, the foamable resin expands and expands while the plugging material has plasticity, and moisture evaporates while the plugging member is firmly fixed in the cell. . After the drying, the honeycomb structure with the plugged portions was fired again, whereby the plugged portions were fired to form the same cordierite plugged portions as the honeycomb structured body. Plugging was performed before the honeycomb structure was fired, and the honeycomb structure and the plugged portion were fired at the same time to form the same cordierite plugging portion as the honeycomb structure.

  The plugged honeycomb structure obtained by the manufacturing method according to the present invention is used in various fields including chemical, electric power, steel, industrial waste treatment, environmental measures such as pollution prevention, and product recovery from high-temperature gas. Filters for dust collection used in applications such as diesel filters, especially diesel particulate filters (DPF) that collect particulates discharged from diesel engines, etc., dust collection filters used in high-temperature, corrosive gas atmospheres Is preferably used.

(A) (b) (c) is an embodiment of the present invention, and is a schematic diagram showing a process of press-fitting into a honeycomb cell after a plugging member is arranged in a fixed mold. (A) (b) (c) is another embodiment of the present invention, and includes a step of press-fitting into a honeycomb cell after a plugging member is disposed in a fixed mold composed of a lower mold and an upper mold. It is a schematic diagram shown. (A) (b) is another embodiment of the present invention, and includes a step in which a plugging member disposed on a fixed mold is press-fitted into a cell of a honeycomb structure and plugged inside the cell. It is a schematic diagram shown. (A) (b) is another embodiment of the present invention, and is a schematic diagram showing a process of plugging inside cells of a honeycomb structure. It is sectional drawing which shows the structure of a plugged honeycomb structure.

Explanation of symbols

2: lower mold, 3: upper mold, 4: cavity, 5: tubular portion, 6: plugging member reservoir, 7: plugging member, 8: honeycomb structure, 9: cell, 10: fixed mold, 11: fixed mold, 12 (12a, 12b): plugging member, 14: depression, 15: honeycomb structure, 16: cell, 21: plugged honeycomb structure, 22: porous partition wall, 23: honeycomb Structure: 24: Cell, 26: Plugging member, B: Cell inlet side end face, C: Cell outlet side end face, 32: Pusher bar holding plate, 33: Pusher bar, 34: Fixed mold, 35: Eye Sealing member, 36: honeycomb structure, 37: cell, 41: fluid reservoir, 42: fixed mold, 43: plugging member, 44: honeycomb structure, 46: pressurized fluid, 47: cell.

Claims (7)

A plugged honeycomb in which a plugged portion is formed at one open end of a predetermined cell of a cylindrical honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the structure,
A method for manufacturing a plugged honeycomb structure, wherein a plugging member formed in a predetermined shape to be inserted into a cell passage to be plugged includes a plastic material exhibiting viscous fluidity.   The method for manufacturing a plugged honeycomb structure according to claim 1, wherein the plugging member includes a heat-foamable resin and / or a water-absorbing resin.   The method for manufacturing a plugged honeycomb structure according to claim 1 or 2, wherein the plugging member contains a gel-like substance.   The method for manufacturing a plugged honeycomb structure according to any one of claims 1 to 3, wherein the plugging member contains at least one of gelatin, agar, tofu, konjac, starch, and silica gel. .   The plugging portion is fixedly formed in the cell passage by the expansion of the plugging member by heating or water absorption after the plugging member reaches a predetermined position in the cell passage. Item 5. A method for manufacturing a plugged honeycomb structure according to any one of Items 1 to 4.   After the plugging member is disposed on the holding part of the fixed mold having a holding part corresponding to a predetermined plugging pattern, the plugging member is plugged by pressing the fixed mold against the end face of the honeycomb structure. The plugged honeycomb structure manufacturing method according to any one of claims 1 to 5, wherein the plugged portion is formed by being inserted into an end portion of a cell passage to be stopped.   The plugged honeycomb structure according to any one of claims 1 to 6, wherein the plugged member is inserted in the middle of the cell passage to be plugged to form a plugged portion. Production method.

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