JP6773701B2 - Jig for drying a square columnar honeycomb molded body, a drying method, and a method for manufacturing a square columnar honeycomb fired product. - Google Patents

Description

The present invention relates to a jig for drying a square columnar honeycomb molded body. The present invention also relates to a method for drying a square columnar honeycomb molded body. The present invention also relates to a method for producing a square columnar honeycomb fired product.

A ceramic structure having a honeycomb structure formed by a plurality of cells serving as a fluid flow path is used as a heat exchange member, a catalyst carrier, a filter, and the like. In particular, such a honeycomb structure is generally produced by adding water or various additives to a ceramic raw material, kneading the mixture, extruding the honeycomb structure into a columnar honeycomb structure, and then performing a drying step and a firing step.

As the volume of the honeycomb molded body increases, it becomes more susceptible to damage due to thermal shock. For this reason, the honeycomb molded body may be divided into a plurality of square columnar honeycomb structure segments, which may be joined and integrated into a structure (International Publication No. 2003/031371, International Publication No. 2016/159063, etc.). ). However, in the drying process of the honeycomb molded body, the honeycomb molded body is likely to be deformed such as bent or twisted, and therefore, if the honeycomb molded body is deformed such as bent or twisted, there is a problem that joining becomes difficult. Therefore, conventionally, various methods have been proposed in order to suppress deformation during drying.

Japanese Unexamined Patent Publication No. 2001-130970 describes a drying method that combines a microwave drying step of drying a ceramic molded body with microwaves and a hot air drying step of further drying the formed body dried with microwaves with hot air. Has been done.

Japanese Patent Laying-Open No. 2003-285312 describes drying in which at least a part of the outer peripheral wall is covered by using a guide that covers the outer peripheral wall so as not to come into contact with the outer peripheral wall or to come into contact with the outer peripheral wall. A method for drying a honeycomb molded product, which comprises a step, is described. In the publication, it is preferable that the pressing force from the guide to the outer peripheral wall when the outer peripheral wall comes into contact with the guide during drying is less than 0.2 MPa, or that microwave drying and hot air drying are combined. Are listed.

Japanese Patent Application Laid-Open No. 2001-130973 describes a method for drying a ceramic molded product that has been dried by microwaves and further dried by hot air, which comprises drying an upper jig and a lower jig provided with a pressure applying means. A method is described in which a ceramic molded product is surrounded from above and below in a close contact state by using a jig, and the ceramic molded product is dried while applying a pressure of 0.4 to 0.6 MPa.

In Japanese Unexamined Patent Publication No. 2001-19533, a drying jig consisting of two separated jigs was used to surround almost the entire side surface of the ceramic molded product having a honeycomb structure parallel to the longitudinal direction in a close contact state. A method of irradiating a ceramic molded product with a microwave in a state to dry the ceramic molded product is described.

International Publication No. 2003/031371 International Publication No. 2016/159063 Japanese Unexamined Patent Publication No. 2001-130970 Japanese Unexamined Patent Publication No. 2003-285312 Japanese Unexamined Patent Publication No. 2001-130973 Japanese Unexamined Patent Publication No. 2001-19533

As described in the above prior art document, conventionally, the honeycomb molded body is dried by a method of combining microwave drying and hot air drying or a method of drying the honeycomb molded body in a state of being pressurized with a drying jig. Attempts have been made to suppress deformation during drying.

However, the conventional method requires a large-capacity fan to send high-speed hot air, and the drying efficiency is not necessarily high.

In addition, since there are multiple types of honeycomb molded products with different cross-sectional dimensions, the conventional drying jig surrounds the molded product in a close contact state, so it must have a unique shape that matches the cross-sectional dimensions of the product. there were. For this reason, it is necessary to hold a dedicated drying jig for each type of product having different cross-sectional dimensions, which causes labor and cost for producing various types of drying jigs. It also took time to secure a space for securing various types of drying jigs and to replace the drying jigs according to the types having different cross-sectional dimensions.

In view of the above matters, it is an object of the present invention to provide a jig for drying a square columnar honeycomb molded body capable of increasing the drying efficiency in one embodiment. Another object of the present invention is to provide a drying jig that can be applied to a square columnar honeycomb molded body having various cross-sectional dimensions in another embodiment.

The present inventor has obtained the following findings as a result of diligent studies to solve the above problems.

In the hot air drying by the conventional method, there is a space around the honeycomb molded body placed on the jig. Since the surrounding space has low fluid resistance, hot air tends to flow out into the surrounding space without passing through the inside of the honeycomb molded body having high fluid resistance. Therefore, the wind speed passing through the inside of the honeycomb molded body tends to decrease. Therefore, it is advantageous to improve the drying efficiency by increasing the fluid resistance around the honeycomb molded body with the drying jig to suppress the hot air flowing out to the periphery of the honeycomb molded body and promoting the wind speed passing through the inside of the honeycomb molded body. is there.

Further, the drying jig can be provided with a movable mechanism that can move according to the cross-sectional dimension of the bottom surface of the honeycomb molded body, which is suitable for a square columnar honeycomb molded body having various cross-sectional dimensions. It is advantageous to provide.

The present invention has been completed based on the above findings, and is exemplified below.

[1]
A jig for drying a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
The inlet of the drying gas and
Drying gas outlet and
A tubular side wall extending from the inlet to the outlet,
First, which is arranged inside the side wall, has a V-groove portion extending from the inlet side toward the outlet side and contacting two adjacent side surfaces of the honeycomb molded body to suppress deformation of the honeycomb molded body. With orthodontic members
A V-groove portion that is arranged inside the side wall, extends from the inlet side toward the outlet side, and contacts the two side surfaces of the honeycomb molded body facing the two side surfaces to suppress deformation of the honeycomb molded body. The second orthodontic member provided and
A bypass blocking member arranged in the space to prevent the drying gas from bypassing from the inlet to the outlet through the space between the honeycomb molding and the side wall.
A jig for drying.
[2]
When the bypass blocking member is observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, the first straightening member and the second straightening member correspond to the diagonal dimension of the bottom surface of the honeycomb molded body. The drying jig according to [1], which includes a movable portion that is movable in a direction connecting the vertices of both V-groove portions of the member.
[3]
The drying jig according to [2], wherein the bypass blocking member includes a first movable portion that works with the first straightening member.
[4]
The drying jig according to [3], wherein the bypass blocking member includes a second movable portion that works with the second straightening member.
[5]
The drying jig according to any one of [1] to [4], wherein the bypass blocking member has a wall surface perpendicular to the extending direction of the first straightening member and the second straightening member.
[6]
The drying jig according to any one of [1] to [5], wherein the bypass blocking member is arranged at two or more locations in the direction from the inlet to the outlet.
[7]
The bypass blocking member is connected to the first inner surface of the side wall and is connected to the first bypass blocking member that holds the first straightening member and the second inner surface facing the first inner surface of the side wall. (Ii) The drying jig according to any one of [1] to [6], which includes a second bypass blocking member for holding the straightening member.
[8]
The first bypass blocking member has both a fixed wall connected to the first inner surface of the side wall and an overlapping portion of the fixed wall along the wall surface of the fixed wall, and both the first straightening member and the second straightening member. The drying jig according to [7], which is provided with a movable wall that is movable in a direction connecting the vertices of the V-groove portion of the above, and is interlocked with the first straightening member by holding the first straightening member.
[9]
The second bypass blocking member has both a fixed wall connected to the second inner surface of the side wall and an overlapping portion of the fixed wall along the wall surface of the fixed wall, and both the first straightening member and the second straightening member. The drying jig according to [8], which includes a movable wall that moves in a direction connecting the vertices of the V-groove portion of the above, and the movable wall interlocks with the second straightening member by holding the second straightening member.
[10]
The drying jig according to [8], wherein the second bypass blocking member includes a fixing wall connected to the second inner surface of the side wall, and the fixing wall holds the second straightening member.
[11]
Any of [7] to [10] that can be separated into a first jig including the first straightening member and the first bypass blocking member and a second jig including the second straightening member and the second bypass blocking member. The drying jig according to item 1.
[12]
The item according to any one of [1] to [11], wherein a plurality of sets of a first straightening member and a second straightening member for the honeycomb molded body are provided in parallel, and a plurality of the honeycomb molded bodies can be accommodated. Drying jig.
[13]
When the bypass blocking member is observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, the first straightening member and the first straightening member and the second straightening member correspond to the diagonal dimension of the bottom surface of the honeycomb molded body. (Ii) The drying jig according to [12], which includes a movable portion that is independently movable in a direction connecting the vertices of both V-groove portions of the straightening member.
[14]
The drying jig according to any one of [1] to [13], wherein the first straightening member is arranged on the upper side in the vertical direction and the second straightening member is arranged on the lower side in the vertical direction.
[15]
In the drying jig according to any one of [1] to [14], the honeycomb molded body containing water is sandwiched between the first straightening member and the second straightening member, and the above-mentioned from the entrance. A method for drying a honeycomb molded product, which comprises a step of flowing a drying gas toward an outlet.
[16]
The drying method according to [15], wherein the wind speed of the drying gas passing through the cells of the honeycomb molded body is 2 m / s or more.
[17]
The drying method according to [15] or [16], wherein the temperature of the drying gas is 80 to 180 ° C.
[18]
The drying method according to any one of [15] to [17], wherein the water content of the honeycomb molded product at the start of the step of flowing the drying gas is 8% by mass to 72% by mass.
[19]
The drying method according to any one of [15] to [18], wherein the honeycomb molded product at the end of the step of flowing a drying gas is absolutely dried with a water content of 0% by mass.
[20]
The drying method according to any one of [15] to [19], which comprises a step of microwave drying the honeycomb molded product before carrying out the step of flowing a drying gas.
[21]
A step of forming a honeycomb molded body containing water, which is a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
A step of drying the honeycomb molded product by carrying out the drying method according to any one of [15] to [20].
The step of firing the dried honeycomb molded body and
A method for producing a baked honeycomb product including.
[22]
A jig for drying a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
The inlet of the drying gas and
Drying gas outlet and
A tubular side wall extending from the inlet to the outlet,
First, which is arranged inside the side wall, has a V-groove portion extending from the inlet side toward the outlet side and contacting two adjacent side surfaces of the honeycomb molded body to suppress deformation of the honeycomb molded body. With orthodontic members
A V-groove portion that is arranged inside the side wall, extends from the inlet side toward the outlet side, and contacts the two side surfaces of the honeycomb molded body facing the two side surfaces to suppress deformation of the honeycomb molded body. The second orthodontic member provided and
When observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, one or both of the first straightening member and the second straightening member correspond to the diagonal dimension of the bottom surface of the honeycomb molded body. A movable mechanism for moving in the direction connecting the vertices of the V-grooves of both the first straightening member and the second straightening member,
A jig for drying.
[23]
The drying jig according to [22], wherein only one of the first straightening member and the second straightening member is movable.
[24]
The drying jig according to [22], wherein both the first straightening member and the second straightening member are movable.
[25]
The item according to any one of [22] to [24], wherein a plurality of sets of a first straightening member and a second straightening member for the honeycomb molded body are provided in parallel, and a plurality of the honeycomb molded bodies can be accommodated. Drying jig.
[26]
When observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, the movable mechanism has the first straightening member and the first straightening member according to the diagonal dimension of the bottom surface of the honeycomb molded body. (Ii) The drying jig according to [25], which includes a movable portion that is independently movable in a direction connecting the vertices of both V-groove portions of the straightening member.
[27]
The drying jig according to any one of [22] to [26], wherein the first straightening member is arranged on the upper side in the vertical direction and the second straightening member is arranged on the lower side in the vertical direction.
[28]
In the drying jig according to any one of [22] to [27], the honeycomb molded body containing water is sandwiched between the first straightening member and the second straightening member, and the above-mentioned from the entrance. A method for drying a honeycomb molded product, which comprises a step of flowing a drying gas toward an outlet.
[29]
The drying method according to [28], wherein the wind speed of the drying gas passing through the cells of the honeycomb molded body is 2 m / s or more.
[30]
The drying method according to [28] or [29], wherein the temperature of the drying gas is 80 to 180 ° C.
[31]
The drying method according to any one of [28] to [30], wherein the water content of the honeycomb molded product at the start of the step of flowing the drying gas is 8% by mass to 72% by mass.
[32]
The drying method according to any one of [28] to [31], wherein the honeycomb molded product at the end of the step of flowing a drying gas is absolutely dried with a water content of 0% by mass.
[33]
The drying method according to any one of [28] to [32], which comprises a step of microwave-drying the honeycomb molded product before carrying out the step of flowing a drying gas.
[34]
A step of forming a honeycomb molded body containing water, which is a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
A step of drying the honeycomb molded product by carrying out the drying method according to any one of [28] to [33].
The step of firing the dried honeycomb molded body and
A method for producing a baked honeycomb product including.

According to the drying jig according to the embodiment of the present invention, the bypass blocking member increases the fluid resistance around the honeycomb molded body, suppresses the hot air flowing out around the honeycomb molded body, and passes through the honeycomb molded body. The proportion of the honeycomb can be increased and the drying efficiency can be improved. Therefore, according to the drying jig, the energy consumption during hot air drying can be reduced, and the production cost of the honeycomb fired product can be expected to be reduced.

According to the drying jig according to another embodiment of the present invention, it can be applied to a square columnar honeycomb molded body having various cross-sectional dimensions. Therefore, it is possible to reduce the labor and cost of manufacturing various types of drying jigs as in the conventional case. In addition, it is possible to save a space for securing various types of drying jigs and a time for replacing the drying jigs according to the types having different cross-sectional dimensions. Therefore, according to the drying jig, it is expected that the production cost of the honeycomb fired product will be reduced.

It is a perspective view which shows an example of a square columnar honeycomb molded body schematically. A state in which a square columnar honeycomb molded body is placed on the lower jig (second jig) provided in the drying jig according to the embodiment of the present invention and the upper jig (first jig) is opened. It is a perspective view to explain. Regarding the drying jig according to the embodiment of FIG. 2, a state in which a square columnar honeycomb molded body placed on the lower jig (second jig) is sandwiched between the upper jig (first jig) from above. It is a perspective view to explain. It is a front view of the fixed wall functioning as a bypass blocking member connected to the upper inner surface (first inner surface) of the side wall of the drying jig according to the embodiment of FIG. It is a front view of the movable wall which functions as a bypass prevention member in the drying jig which concerns on embodiment of FIG. It is a front view of the fixed wall which functions as a bypass prevention member connected to the lower inner surface (second inner surface) of the side wall of the drying jig which concerns on embodiment of FIG.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The present invention is not limited to the following embodiments, and the following embodiments are appropriately modified or improved based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that those skilled in the art also fall within the scope of the present invention. Each embodiment and / or each feature can be combined.

(1. Honeycomb molded body)
FIG. 1 shows a schematic perspective view of an example of a square columnar honeycomb molded body to which the drying jig according to the present invention can be applied. In the square columnar honeycomb molded body 1, a plurality of cells 3 extending from the first bottom surface 5 to the second bottom surface 6 are partitioned by the partition wall 2 inside the outer wall 4. The shape of the honeycomb molded body is not particularly limited as long as it is a square pillar, but is typically a square pillar with a rectangular bottom surface, and more typically a square pillar with a square bottom surface.

The shape of the cell in the cross section perpendicular to the flow path direction of the cell is not limited, but is preferably a quadrangle, a hexagon, an octagon, or a combination thereof. In the honeycomb molded body 1 shown in FIG. 1, the shape of the cell 3 in the cross section perpendicular to the flow path direction of the cell 3 is rectangular. Of these, squares and hexagons are preferred.

The honeycomb molded body can be formed into a desired columnar honeycomb molded body by kneading a raw material composition containing a ceramic raw material, water, and a binder to form a clay, and then extruding the clay. Additives such as a surfactant and a pore-forming material can be added to the raw material composition as needed. In extrusion molding, a mouthpiece having a desired overall shape, cell shape, partition wall thickness, cell density and the like can be used.

The ceramic raw material is not limited, but is an oxide-based ceramics such as alumina, mulite, zirconia, cordierite, cordierite raw material, titania, spinel, aluminum titanate and lithium aluminum silicate, silicon carbide, silicon nitride and nitrided. Non-oxide ceramics such as aluminum can be mentioned. Further, a silicon carbide-metal silicon composite material, a silicon carbide / graphite composite material, or the like can also be used.

The water content of the honeycomb molded product before the drying step is preferably 10 to 90 parts by mass, more preferably 10 to 60 parts by mass with respect to 100 parts by mass of the ceramic raw material. It is even more preferably 10 to 40 parts by mass. When the water content of the honeycomb molded body is 10 parts by mass or more with respect to 100 parts by mass of the ceramic raw material, it is easy to obtain the advantage that the quality of the clay is easily stabilized. When the water content of the honeycomb molded product is 90 parts by mass or less with respect to 100 parts by mass of the ceramic raw material, the amount of shrinkage during drying can be reduced and deformation can be suppressed. In the present specification, the water content of the honeycomb molded product refers to a value measured by the drying weight loss method.

In one embodiment of the honeycomb molding, all cells may be penetrated from the first surface to the second bottom surface. Further, in another embodiment of the honeycomb molded body, a plurality of first cells extending from the first bottom surface to the second bottom surface, the first bottom surface is opened, and the second bottom surface is sealed, and the first bottom surface. It is possible to have a cell structure in which a plurality of second cells extending from the second bottom surface to the second bottom surface and the second bottom surface is sealed and the first bottom surface is opened are alternately arranged adjacent to each other with a partition wall in between. The method for sealing the bottom surface of the honeycomb molded product is not particularly limited, and a well-known method can be adopted.

(2. Drying jig)
In FIG. 2, a square columnar honeycomb molded body is placed on the lower jig (second jig) provided in the drying jig according to the embodiment of the present invention, and the upper jig (first jig) is shown. A perspective view illustrating a state in which the jig is open is described. In FIG. 3, regarding the drying jig according to the embodiment of FIG. 2, a square columnar honeycomb molded body placed on the lower jig (second jig) is used on the upper jig (first jig). A perspective view explaining the state of sandwiching from above is described. FIG. 4 shows a front view of a fixed wall that functions as a bypass blocking member and is connected to the upper inner surface (first inner surface) of the side wall of the drying jig according to the embodiment of FIG. FIG. 5 shows a front view of a movable wall that functions as a bypass blocking member in the drying jig according to the embodiment of FIG. FIG. 6 shows a front view of a fixed wall that functions as a bypass blocking member and is connected to the lower inner surface (second inner surface) of the side wall of the drying jig according to the embodiment of FIG.

The material of the drying jig 100 is not limited, but examples thereof include aluminum, stainless steel, iron, resin, and ceramics, and aluminum is preferable when it is manufactured by machining.

The drying jig 100 for the square columnar honeycomb molded body 1 according to the embodiment of FIG. 2 is
Drying gas inlet 101 and
Drying gas outlet 102 and
A tubular side wall 103 extending from the inlet 101 to the outlet 102,
A V-groove portion which is arranged inside the side wall 103, extends from the inlet 101 side toward the outlet 102 side, and contacts two adjacent side surfaces of the honeycomb molded body 1 to suppress deformation of the honeycomb molded body 1. The first orthodontic member 110 provided with 112 and
It is arranged inside the side wall 103, extends from the inlet 101 side toward the outlet 102 side, and contacts the two side surfaces of the honeycomb molded body 1 facing the two side surfaces to suppress deformation of the honeycomb molded body 1. Second straightening member 120 provided with a V-groove portion 112 for
To be equipped.

In the drying jig 100 according to the embodiment of FIG. 2, the first straightening member 110 is arranged on the upper side in the vertical direction, and the second straightening member 120 is arranged on the lower side in the vertical direction. The honeycomb molded body 1 is placed on the drying jig 100 so that a pair of sides extending in the flow path direction of the cell are arranged in the vertical direction. When observed from the extending direction of the V-groove portion 112 (X direction in the drawing), the length of each of the two inner surfaces constituting the V-groove portion 112 of the lower second straightening member 120 is the upper first straightening member. It can be longer than the length of each of the two inner surfaces forming the V-groove 112 of 110. The lower second straightening member needs to be large enough to receive the honeycomb compacts of various cross-sectional dimensions. On the other hand, the upper first straightening member is sufficient if the honeycomb molded body 1 can be suppressed. If the upper first straightening member is made excessively large, when the honeycomb molded body having a small cross-sectional size is dried, the upper first straightening member comes into contact with the lower second straightening member before coming into contact with the honeycomb molded body. Therefore, the honeycomb molded body cannot be suppressed. That is, it is preferable to reduce the length of each of the two inner side surfaces forming the V-groove portion of the upper first straightening member so that the honeycomb molded body having a small cross-sectional size can be straightened.

Specifically, when observed from the extending direction of the V-groove portion 112 (X direction in the drawing), the length of each of the two inner side surfaces constituting the V-groove portion of the upper first straightening member is L ₁ , and the lower portion. Assuming that the length of each of the two inner surfaces constituting the V-groove portion of the second straightening member on the side is L ₂ , it is preferable that L ₁ / L ₂ ≤ 0.9, and L ₁ / L ₂ ≤ 0. It is more preferably 8 and even more preferably L ₁ / L ₂ ≤ 0.7. However, if L ₁ is too small, the honeycomb molded body cannot be sufficiently fixed during drying, or the effect of correcting the warp and / or deformation of the honeycomb molded body that occurs during drying becomes small. Therefore, 0.1 ≦ L ₁ / L ₂ It is preferable that 0.2 ≦ L ₁ / L _2, and even more preferably 0.3 ≦ L ₁ / L ₂ .

In the drying jig 100 according to the embodiment of FIG. 2, the V-groove portion 112 of the first straightening member 110 constitutes the V-groove portion 112, although there may be an error due to deformation such as bending or twisting of the honeycomb molded body 1. The two inner surfaces are designed to be parallel to the two adjacent upper side surfaces of the honeycomb compact 1. In other words, in the drying jig 100 according to the embodiment of FIG. 2, when observed from the extending direction of the V-groove portion 112, the apex angle of the V-groove portion 112 of the first straightening member 110 is adjacent to the honeycomb molded body 1. It substantially matches the angle formed by the two upper sides. The apex angle of the V-groove portion 112 of the first straightening member 110 may be appropriately set according to the shape of the honeycomb molded body, but is 90 ° when the bottom surface of the honeycomb molded body is rectangular (including a square). be able to. As a result, the two inner side surfaces forming the V-groove portion 112 of the first straightening member 110 can be brought into contact with the two adjacent upper side surfaces of the honeycomb molded body 1, respectively.

Similarly, in the drying jig 100 according to the embodiment of FIG. 2, although there may be an error due to deformation such as bending or twisting of the honeycomb molded body 1, the V-groove portion 112 of the second straightening member 120 has a V-groove portion 112. The two inner side surfaces constituting the honeycomb molded body 1 are designed to be parallel to the two adjacent lower side surfaces of the honeycomb molded body 1. In other words, in the drying jig 100 according to the embodiment of FIG. 2, when observed from the extending direction of the V-groove portion 112, the apex angle of the V-groove portion 112 of the second straightening member 120 is adjacent to the honeycomb molded body 1. It matches the angle formed by the two lower sides. The apex angle of the V-groove portion 112 of the second straightening member 120 may be appropriately set according to the shape of the honeycomb molded body, but is 90 ° when the bottom surface of the honeycomb molded body is rectangular (including a square). be able to. As a result, the two inner side surfaces forming the V-groove portion 112 of the second straightening member 120 can come into contact with the two adjacent lower side surfaces of the honeycomb molded body 1, respectively.

Therefore, in a state where the honeycomb molded body 1 containing water is sandwiched between the first straightening member 110 and the second straightening member 120 in the drying jig 100, the drying gas is blown from the inlet 101 toward the outlet 102. When flowed, the drying gas can flow through the cells of the honeycomb molded body 1 to accelerate the drying of the honeycomb molded body 1. Further, since the honeycomb molded body 1 contains water, the shape straightening effect and the deformation suppressing effect can be received by the pressure from the V groove portions 112 of the first straightening member 110 and the second straightening member 120, respectively. A dried body of the honeycomb molded body 1 having excellent accuracy can be obtained.

The pressure on the honeycomb molded body 1 when the honeycomb molded body 1 is sandwiched between the first straightening member 110 and the second straightening member 120 is such that the material and water content of the honeycomb molded body are enhanced so that the shape straightening effect and the deformation suppressing effect are enhanced. It may be set appropriately in consideration of. In the drying jig 100 of the square columnar honeycomb molded body 1 according to the embodiment of FIG. 2, the pressure due to its own weight is applied by the upper first straightening member 110. The method of applying the pressure is not limited to its own weight, and the pressure may be applied from the outside. Regardless of the type of honeycomb compact to be dried, the upper limit of the pressure value is the value at which the honeycomb compact is not deformed by pressure, while it is sufficient to correct the warp and / or deformation of the honeycomb compact that occurs during drying. Pressure value becomes the lower limit value. Since this range differs depending on the type of the honeycomb molded body to be dried, the pressure value may be set appropriately for the type of the honeycomb molded body.

(2-1 Movable mechanism)
The drying jig 100 according to the embodiment of FIG. 2 has the first straightening member 110 and the second straightening member 120 when observed from the extending direction of the V-groove portion 112 of both the first straightening member 110 and the second straightening member 120. One or both of 120 connect the vertices of the V-grooves 112 of both the first straightening member 110 and the second straightening member 120 according to the diagonal dimension of the bottom surface of the honeycomb molded body (Y-axis in the drawing). Direction. Hereinafter, a movable mechanism 130 for moving in the “V-groove facing direction”) is provided. By providing the movable mechanism, one drying jig 100 can be applied to a square columnar honeycomb molded body having various cross-sectional dimensions. Therefore, it is possible to reduce the labor and cost of manufacturing various types of drying jigs as in the conventional case. In addition, it is possible to save a space for securing various types of drying jigs and a time for replacing the drying jigs according to the types having different cross-sectional dimensions.

The movable mechanism 130 may be configured so that only one of the first straightening member 110 and the second straightening member 120 is movable, or both the first straightening member and the second straightening member are movable. May be good. However, as in the embodiment shown in FIG. 2, when the honeycomb molded body is sandwiched between the first straightening member 110 and the second straightening member 120 from the vertical direction, only the upper first straightening member 110 is movable. It suffices if the mechanism 130 is configured.

In the drying jig 100 according to the embodiment of FIG. 2, the movable mechanism 130 has a fixing portion 130a connected to the first inner surface 103a of the side wall 103 and a V-groove facing direction in a predetermined range with respect to the fixing portion 130a. A movable portion 130b that is relatively movable and interlocks with the first straightening member 110 by holding the first straightening member 110 is provided. In order to stably hold the first straightening member 110, the movable mechanism 130 is provided at one or more positions on the inlet 101 side and the outlet 102 side of the center of the V groove portion 112 of the first straightening member 110 in the extending direction. Is preferable.

The method of connecting the fixing portion 130a to the first inner surface 103a of the side wall 103 is not particularly limited, and examples thereof include welding, screw fastening, and hooking. The method in which the movable portion 130b holds the first straightening member 110 is also not particularly limited, and examples thereof include welding, screw fastening, and hooking. In the drying jig 100 according to the embodiment of FIG. 2, the fixing portion 130a is connected to the first inner surface 103a of the side wall 103 by screwing. Further, in the drying jig 100 according to the embodiment of FIG. 2, the movable portion 130b has a pair of hook portions 136 that are locked to the lower end portion of the first straightening member 110.

In the drying jig 100 according to the embodiment of FIG. 2, the V-groove facing direction is the vertical direction, and the first inner surface 103a of the side wall 103 is located on the upper side. Since the V-groove facing direction is the vertical direction, there is an advantage that the weight of the first jig 100a can be used as the pressure applied to the honeycomb molded body 1. However, the V-groove facing direction is not limited to the vertical direction, and may be oriented in the horizontal direction or the diagonal direction.

The mechanism for moving the movable portion 130b relative to the fixed portion 130a in the direction facing the V-groove is not particularly limited, and any known mechanism may be adopted. In the embodiment of FIG. 2, one of the fixed portion 130a or the movable portion 130b has a hole portion 132 extending in the direction opposite to the V groove for limiting the moving range, and the other of the fixed portion 130a or the movable portion 130b has the hole. It has a protrusion 134 that is inserted into the portion 132. With this mechanism, the movable portion 130b can slide relative to the fixed portion 130a in the direction facing the V-groove. The hole 132 for limiting the movement range may be a through hole, but it can also be formed in a groove shape without penetrating.

(2-2 Bypass blocking member)
The drying jig 100 according to the embodiment of FIG. 2 prevents the drying gas from bypassing from the inlet 101 to the outlet 102 through the space between the honeycomb molded body 1 and the side wall 103. The bypass blocking members 130 and 140 are arranged in the space. It is preferable that the bypass blocking members 130 and 140 extend in a direction perpendicular to the extending direction of the V-groove portion 112 of both the first straightening member 110 and the second straightening member 120. In order to effectively prevent the drying gas from bypassing, the bypass blocking members 130 and 140 are hot air when observed from the extending direction of the V groove portion 112 of both the first straightening member 110 and the second straightening member 120. It is preferable that the leakage portion cross-sectional area / the total cross-sectional area of the hot air flow path is extended so as to be 10% or less, more preferably it is extended so as to be 6% or less, and it is extended so as to be 2% or less. It is even more preferable to do so. The bypass blocking member increases the fluid resistance around the honeycomb molded body, suppresses the hot air flowing out around the honeycomb molded body, increases the proportion of hot air passing through the honeycomb molded body, and can improve the drying efficiency. Here, the cross-sectional area of the hot air leak portion refers to the drying jig when the drying jig is observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, except for the honeycomb molded body. It is the total cross-sectional area of the part surrounded by the side wall that penetrates from the entrance to the exit (the part where the exit can be seen from the entrance). Further, the total cross-sectional area of the hot air flow path is the side wall of the drying jig including the honeycomb molded body when the drying jig is observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member. It is the total cross-sectional area of the part surrounded by.

In the embodiment shown in FIG. 2, the bypass blocking members 130 and 140 have a wall surface perpendicular to the extending direction of the first straightening member 110 and the second straightening member 120. With this configuration, it is possible to enhance the effect of suppressing the drying air from flowing out to the periphery of the honeycomb molded body.

In the embodiment shown in FIG. 2, two or more bypass blocking members 130 and 140 are arranged in the direction from the inlet 101 to the outlet 102. This configuration also makes it possible to effectively prevent the drying air from flowing out to the periphery of the honeycomb molded body.

In the embodiment shown in FIG. 2, the bypass blocking members 130 and 140 are connected to the first inner surface 103a of the side wall 103 and hold the first straightening member 110, and the first bypass blocking member 130 and the side wall 103. It is provided with a second bypass blocking member 140 which is connected to the second inner surface 103b facing the first inner surface 103a and holds the second straightening member 120. According to this configuration, the bypass preventing members 130 and 140 can also have a role of holding the first straightening member 110 and the second straightening member 120, which contributes to the reduction of the number of parts of the drying jig 100.

The first bypass blocking member 130 and the second bypass blocking member 140 are preferably arranged on the same plane in order to enhance the effect of suppressing the drying air from flowing out to the periphery of the honeycomb molded body.

In order to stably hold the first straightening member 110, the first bypass blocking member 130 is provided at one location on the inlet 101 side and one on the outlet 102 side of the center of the V groove portion 112 of the first straightening member 110 in the extending direction. It is preferable to provide the above. Similarly, in order to stably hold the second straightening member 120, the second bypass blocking member 140 is located on the inlet 101 side and the outlet 102 side of the center of the V groove portion 112 of the second straightening member 120 in the extending direction, respectively. It is preferable to provide one or more places.

The bypass blocking members 130 and 140 may be connected and fixed to the inner surface of the side wall 103. However, in that case, when the dimensions of the honeycomb molded body in the direction facing the V-groove fluctuate, the space between the honeycomb molded body 1 and the side wall 103 cannot be sufficiently shielded by the bypass blocking members 130 and 140, and the drying air cannot be sufficiently shielded. Bypass route may occur. Therefore, it is preferable that the bypass blocking members 130 and 140 are movable so that the bypass blocking function can be stably obtained even if the V-groove facing direction of the honeycomb molded body fluctuates. That is, it is desirable that at least one of the first bypass blocking member 130 and the second bypass blocking member 140, preferably the upper first bypass blocking member 130, also has the above-mentioned movable mechanism.

Therefore, in the drying jig 100 according to the embodiment of FIG. 2, when the first bypass blocking member 130 is observed from the extending direction of the V-groove portion 112 of both the first straightening member 110 and the second straightening member 120, A movable portion 130b that moves in a direction connecting the vertices of the V-groove portions 112 of both the first straightening member 110 and the second straightening member 120 (direction facing the V-groove) according to the diagonal dimension of the bottom surface of the honeycomb molded body 1. To be equipped.

The movable portion of the bypass blocking member may be configured to be interlocked with only one of the first straightening member 110 and the second straightening member 120, or may be interlocked with both the first straightening member 110 and the second straightening member 120. It may be configured as follows. However, as in the embodiment of FIG. 2, when the honeycomb molded body is sandwiched between the first straightening member 110 and the second straightening member 120 from the vertical direction, the movable portion of the bypass blocking member is only the upper first straightening member 110. It is enough to work with.

The mechanism by which the movable portion of the bypass blocking member is interlocked with the first straightening member 110 is not particularly limited. For example, when the bypass blocking member includes the first bypass blocking member 130 described above, the first bypass blocking member 130 is described below. It can be configured as follows. That is, in one embodiment, the first bypass blocking member 130 has an overlapping portion of the fixed wall 130a connected to the first inner surface 103a of the side wall 103 and the fixed wall 130a along the wall surface of the fixed wall 130a. However, a movable wall 130b that is movable in a direction connecting the vertices of the V-grooves of both the first straightening member 110 and the second straightening member 120 is provided, and the movable wall 130b holds the first straightening member 110. (1) Interlocks with the straightening member 110. The same description applies to the mechanism when the second bypass blocking member 140 has a movable portion (not shown) interlocking with the second straightening member 120.

The mechanism for moving the movable wall 130b relative to the fixed wall 130a in the direction facing the V-groove is not particularly limited, and any known mechanism may be adopted. In the embodiment shown in FIG. 2, one of the fixed wall 130a or the movable wall 130b has a hole 132 extending in the direction opposite to the V groove for limiting the moving range, and the other of the fixed wall 130a or the movable wall 130b is said to be the same. It has a protrusion 134 that is inserted into the hole 132. With this mechanism, the movable wall 130b can slide relative to the fixed wall 130a in the direction facing the V-groove. The length of the hole 132 in the direction facing the V-groove may be set within a range in which the movable wall 130b can move along the wall surface of the fixed wall 130a while having an overlapping portion with the fixed wall 130a. The hole 132 for limiting the movement range may be a through hole, but it can also be formed in a groove shape without penetrating.

On the other hand, there is no particular limitation on the configuration when the bypass blocking member does not interlock with the second straightening member 120, but when the bypass blocking member includes the above-mentioned second bypass blocking member 140, the second bypass blocking member 140 is used. It can be configured as follows. That is, as shown in FIG. 2, in one embodiment, the second bypass blocking member 140 includes a fixed wall 140b connected to a second inner surface 103b facing the first inner surface 103a of the side wall 103, and the fixed wall 140b. Holds the second straightening member 120.

The drying jig 100 according to the embodiment of FIG. 2 includes a plurality of sets of a first straightening member 110 and a second straightening member 120 for a honeycomb molded body in parallel, and can accommodate a plurality of honeycomb molded bodies 1. It has become. With this configuration, a plurality of honeycomb molded bodies 1 can be dried at the same time in a single drying process, so that production efficiency can be improved. The distance between the sets of the first straightening member 110 and the second straightening member 120 may be appropriately set according to the assumed dimensions of the honeycomb molded body 1 so as not to interfere with each other.

In this case, the bypass blocking members 130 and 140 have diagonal dimensions of the bottom surface of each honeycomb molded body 1 when observed from the extending direction of the V-groove portion 112 of both the first straightening member 110 and the second straightening member 120. Therefore, it is preferable to provide a movable portion 130b that can move independently in the direction connecting the vertices of the V-groove portions 112 of both the first straightening member 110 and the second straightening member 120. As a result, a plurality of honeycomb molded bodies 1 having different diagonal dimensions can be appropriately accommodated in one drying jig 100.

The drying jig 100 according to the embodiment of FIG. 2 includes a first jig 100a including a first straightening member 110 and a first bypass blocking member 130, and a second straightening member 120 and a second bypass blocking member 140. It can be separated into two jigs 100b. With this configuration, the honeycomb molded body 1 can be easily attached to and detached from the drying jig 100. When assembling the first jig 100a and the second jig 100b, both may be fixed by using an arbitrary fixing means. Examples of the fixing means include a method of cutting a female screw on one jig and fastening it with a screw, a method of fixing with a bolt and a nut, a method of fixing with a clamp, and the like.

(3. Drying method)
The water-containing honeycomb molded body can be dried with hot air using the drying jig according to the present invention to remove the water. The honeycomb molded body may be dried only by hot air drying using the drying jig according to the present invention, but in the drying process, the amount of water between the portion close to the surface of the honeycomb molded body and the inside of the honeycomb molded body is increased. A large difference is likely to occur, and the honeycomb molded body may be warped or cracked. Further, if it is attempted to dry slowly so as not to cause such warpage or cracks, it is necessary to dry for a long time in order to dry to near absolute drying.

Therefore, before the hot air drying performed by using the drying jig according to the present invention, pre-drying is performed to remove a part of the moisture of the honeycomb molded body by an electromagnetic wave heating method such as microwave drying or high-frequency dielectric heating drying. It is preferable to keep it. When the drying by the electromagnetic wave heating method is carried out, a well-known drying method such as an external heating method such as hot air drying and superheated steam drying may be appropriately combined.

In a preferred embodiment, the moisture content of the honeycomb molded body at the start of flowing a drying gas for hot air drying using the drying jig according to the present invention is 8% by mass or more. When the moisture content of the honeycomb molded body at the start of hot air drying is 8% by mass or more, the drying jig according to the present invention is used for warping or deformation of the honeycomb molded body that may occur in the preliminary drying in the previous stage. The correction effect of hot air drying can be enhanced. The water content of the honeycomb molded product at the start of hot air drying is preferably 8% by mass or more, more preferably 13% by mass or more, and even more preferably 27% by mass or more.

Further, in a preferred embodiment, the water content of the honeycomb molded body at the start of flowing the drying gas for hot air drying using the drying jig according to the present invention is 72% by mass or less. When the water content of the honeycomb molded product at the start of hot air drying is 72% by mass or less, there is an advantage that the drying time can be shortened. The water content of the honeycomb molded product at the start of hot air drying is preferably 72% by mass or less, more preferably 48% by mass or less, and even more preferably 32% by mass or less.

The moisture content of the honeycomb molded product is measured by the dry weight loss method. Specifically, it is calculated by (1-honeycomb molded body weight at absolute drying / honeycomb molded body weight) × 100 (%).

The drying gas generated by the hot air generator (not shown) can be sent to the drying gas inlet 101. In order to improve the drying efficiency, the outlet of the hot air generator and the inlet 101 of the drying gas are connected via a duct so that substantially the entire amount of the drying gas generated by the hot air generator flows into the drying jig 100. It is preferable to do so. The type of the drying gas is not limited, for example, air is preferable, but the gas is not limited to air as long as it has hygroscopicity and can dry the honeycomb molded product.

The temperature of the drying gas sent to the inlet 101 of the drying gas is not limited, but is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and 120 ° C. in order to shorten the drying time. The above is even more preferable. Further, in order to prevent the honeycomb molded body from being removed from the binder, the temperature of the drying gas sent to the inlet 101 of the drying gas is preferably 180 ° C. or lower, more preferably 160 ° C. or lower, and 140 ° C. or lower. It is even more preferable to do so.

The drying gas sent to the inlet 101 of the drying gas flows in from the first bottom surface of the honeycomb molded body 1, passes through the cell, and then flows out from the second bottom surface. After that, the drying gas flows out from the outlet 102 of the drying gas. While the honeycomb molded body 1 is being dried, the direction in which the drying gas is sent can be switched by alternately switching the drying gas inlet 101 and the drying gas outlet 102. However, it is preferable to fix the inlet 101 of the drying gas and the outlet 102 of the drying gas and keep the direction in which the drying gas is sent constant from the viewpoint of suppressing the occurrence of sharpness and cracks in the honeycomb molded body 1.

The higher the wind speed of the drying gas, the shorter the drying time, and the easier it is to suppress the deformation of the honeycomb molded body. Therefore, the wind speed of the drying gas passing through the flow path of the cell is preferably 2.0 m / s or more, and more preferably 4.0 m / s or more. Further, since the effect of shortening the drying time by increasing the wind speed is limited, the wind speed of the drying gas passing through the flow path of the cell is preferably 10 m / s or less, more preferably 9 m, in consideration of economic efficiency. It is less than / s. In the present specification, the wind speed of the drying gas passing through the flow path of the cell is a value measured by a thermal anemometer conforming to JIS T8202-1997.

From the viewpoint of reducing the variation in the total pore volume in the cell flow path direction of the honeycomb molded body, the water content of the honeycomb molded body at the end of the step of flowing the drying gas is 2.0% by mass or less. Therefore, it is desirable to carry out the drying step so as to be preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. There is no particular reason to set the lower limit, and the water content of the honeycomb molded product at the end of the step of flowing the drying gas may be absolute drying of 0% by mass.

(4. Baking)
After the drying step is carried out, the honeycomb structure made of ceramics can be manufactured by firing the dried honeycomb molded body. A degreasing step to remove the binder can also be performed before firing. Further, after drying, it is possible to perform an outer peripheral grinding process for increasing the cylindricity or a slit process on the outer peripheral wall, if necessary. Further, it is also possible to cut the honeycomb molded body so as to have a length in the flow path direction of a predetermined cell according to the required specifications. These processes may be performed at any timing before degreasing / firing and after degreasing / firing, but when the strength after degreasing / firing is high and the processing difficulty is high as in the case of Si impregnation firing, degreasing is performed. -It is preferable to carry out before firing. The degreasing condition and the firing condition may be any known condition, but it is preferable to appropriately set the temperature, time and atmosphere according to the raw material system. Typical degreasing conditions and firing conditions for producing a heat exchange member are illustrated below.

Although the binder and the molding aid are necessary at the time of molding, they are not needed in the end, so it is preferable to carry out a degreasing step of removing them before firing. From the viewpoint of ease of burning the binder, the heating temperature of the honeycomb molded product in the degreasing step is preferably 300 ° C. or higher, more preferably 350 ° C. or higher, and even more preferably 400 ° C. or higher. The heating temperature of the honeycomb molded product in the degreasing step is preferably 600 ° C. or lower, more preferably 550 ° C. or lower, and even more preferably 500 ° C. or lower in order to suppress the manufacturing cost during degreasing.

From the viewpoint of the ease of burning the binder, the heating time of the honeycomb molded product at the above heating temperature is preferably 1 hour or more, more preferably 2 hours or more, and further preferably 3 hours or more. More preferred. In order to suppress the manufacturing cost at the time of degreasing, the heating time of the honeycomb molded product at the above heating temperature is preferably 10 hours or less, more preferably 8 hours or less, and further preferably 6 hours or less. More preferred.

The atmosphere for carrying out the degreasing step can be, for example, an atmospheric atmosphere, an inert atmosphere, or a reduced pressure atmosphere. Among these, it is preferable to create an inert atmosphere and a reduced pressure atmosphere that prevent insufficient sintering due to oxidation of the raw material and easily reduce the oxide contained in the raw material.

Examples of the firing method include, but are not limited to, reaction sintering, recrystallization sintering, reduced pressure Si impregnation, normal pressure Si impregnation, and Si bond SiC. Reaction sintering refers to a firing method in which a molded product made of SiC and C is impregnated with molten Si and SiC is obtained by the reaction of C and Si. Recrystallization sintering refers to a firing method in which SiC particles formed at high density are sintered at a high temperature of 2000 ° C. or higher. Decompression Si impregnation refers to a firing method in which metallic silicon is impregnated under reduced pressure. Normal pressure Si impregnation refers to a firing method in which metallic silicon is impregnated under normal pressure. Si-bonded SiC refers to a firing method in which a raw material mixture composed of SiC and Si is fired to obtain a sintered body having a structure in which SiC is held by Si. When the binder is removed, a gap corresponding to the gap is formed in the molded product. Therefore, a method of melting the metallic silicon and impregnating the gap with Si by firing while in contact with the metallic silicon is preferable. By using such a Si-impregnated sintered body, mechanical strength, thermal conductivity, and the like can be increased.

The firing is preferably carried out in an inert atmosphere and a reduced pressure atmosphere because it prevents insufficient sintering due to oxidation of the raw material and easily reduces the oxide contained in the raw material. Examples of the inert atmosphere include a nitrogen gas atmosphere, a rare gas atmosphere such as argon, or a mixed gas atmosphere thereof.

The firing temperature is preferably 1350 ° C. or higher, more preferably 1400 ° C. or higher, and even more preferably 1450 ° C. or higher in order to sufficiently perform sintering. The firing temperature is preferably 2200 ° C. or lower, more preferably 1800 ° C. or lower, and even more preferably 1600 ° C. or lower in order to suppress the manufacturing cost at the time of firing.

In order to sufficiently perform sintering, the heating time of the molded product at the above firing temperature is preferably 0.25 hours or more, more preferably 0.5 hours or more, and more preferably 0.75 hours or more. Is even more preferable. In order to reduce the manufacturing cost at the time of firing, the heating time of the molded product at the above firing temperature is preferably 5 hours or less, more preferably 4 hours or less, and even more preferably 3 hours or less. preferable.

The firing furnace is not particularly limited, but an electric furnace, a gas furnace, or the like can be used.

The ceramic honeycomb structure according to the present invention can be used, for example, as a heat exchange member, a catalyst carrier, a filter, or the like.

1 Honeycomb molded body 2 Partition 3 Cell 4 Outer side wall 5 First bottom surface 6 Second bottom surface 100 Drying jig 100a First jig 100b Second jig 101 Drying gas inlet 102 Drying gas outlet 103 Side wall 103a Side wall First inner surface 103b Second inner surface 110 of the side wall 110 First straightening member 112 V groove 120 Second straightening member 130 Movable mechanism (first bypass blocking member)
140 Second bypass blocking member 130a Fixed part (fixed wall)
130b Movable part (movable wall)
140b Fixed wall 132 Hole 134 Protrusion 136 Hook

Claims (34)

A jig for drying a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
The inlet of the drying gas and
Drying gas outlet and
A tubular side wall extending from the inlet to the outlet,
First, which is arranged inside the side wall, has a V-groove portion extending from the inlet side toward the outlet side and contacting two adjacent side surfaces of the honeycomb molded body to suppress deformation of the honeycomb molded body. With orthodontic members
A V-groove portion that is arranged inside the side wall, extends from the inlet side toward the outlet side, and contacts the two side surfaces of the honeycomb molded body facing the two side surfaces to suppress deformation of the honeycomb molded body. The second orthodontic member provided and
A bypass blocking member arranged in the space to prevent the drying gas from bypassing from the inlet to the outlet through the space between the honeycomb molding and the side wall.
A jig for drying. The bypass blocking member is the first straightening member and the second straightening member according to the diagonal dimension of the bottom surface of the honeycomb molded body when observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member. The drying jig according to claim 1, further comprising a movable portion that is movable in a direction connecting the vertices of both V-groove portions of the member. The drying jig according to claim 2, wherein the bypass blocking member includes a first movable portion that interlocks with the first straightening member. The drying jig according to claim 3, wherein the bypass blocking member includes a second movable portion that interlocks with the second straightening member. The drying jig according to any one of claims 1 to 4, wherein the bypass preventing member has a wall surface perpendicular to the extending direction of the first straightening member and the second straightening member. The drying jig according to any one of claims 1 to 5, wherein the bypass blocking member is arranged at two or more locations in the direction from the inlet to the outlet. The bypass blocking member is connected to the first inner surface of the side wall and is connected to the first bypass blocking member holding the first straightening member and the second inner surface facing the first inner surface of the side wall, and is the first. (Ii) The drying jig according to any one of claims 1 to 6, further comprising a second bypass blocking member for holding the straightening member. The first bypass blocking member has both a fixed wall connected to the first inner surface of the side wall and an overlapping portion of the fixed wall along the wall surface of the fixed wall, and both the first straightening member and the second straightening member. The drying jig according to claim 7, further comprising a movable wall movable in a direction connecting the vertices of the V-groove portion of the above, and interlocking with the first straightening member by holding the first straightening member. The second bypass blocking member has both a fixed wall connected to the second inner surface of the side wall and an overlapping portion of the fixed wall along the wall surface of the fixed wall, and both the first straightening member and the second straightening member. The drying jig according to claim 8, further comprising a movable wall movable in a direction connecting the vertices of the V-groove portion of the above, and interlocking with the second straightening member by holding the second straightening member. The drying jig according to claim 8, wherein the second bypass blocking member includes a fixing wall connected to the second inner surface of the side wall, and the fixing wall holds the second straightening member. Any one of claims 7 to 10 that can be separated into a first jig including the first straightening member and the first bypass blocking member and a second jig including the second straightening member and the second bypass blocking member. The drying jig described in. The drying according to any one of claims 1 to 11, wherein a plurality of sets of a first straightening member and a second straightening member for the honeycomb molded body are provided in parallel, and the plurality of sets of the honeycomb molded body can be accommodated. Jig. When the bypass blocking member is observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, the first straightening member and the first straightening member and the second straightening member correspond to the diagonal dimension of the bottom surface of the honeycomb molded body. (Ii) The drying jig according to claim 12, further comprising a movable portion that is independently movable in a direction connecting the vertices of both V-groove portions of the straightening member. The drying jig according to any one of claims 1 to 13, wherein the first straightening member is arranged on the upper side in the vertical direction and the second straightening member is arranged on the lower side in the vertical direction. In the drying jig according to any one of claims 1 to 14, the honeycomb molded body containing water is sandwiched between the first straightening member and the second straightening member, and from the inlet to the outlet. A method for drying a honeycomb molded product, which comprises a step of flowing a drying gas toward the body. The drying method according to claim 15, wherein the wind speed of the drying gas passing through the cells of the honeycomb molded body is 2 m / s or more. The drying method according to claim 15 or 16, wherein the temperature of the drying gas is 80 to 180 ° C. The drying method according to any one of claims 15 to 17, wherein the water content of the honeycomb molded product at the start of the step of flowing a drying gas is 8% by mass to 72% by mass. The drying method according to any one of claims 15 to 18, wherein the moisture content of the honeycomb molded product at the end of the step of flowing a drying gas is absolute drying of 0% by mass. The drying method according to any one of claims 15 to 19, which comprises a step of microwave-drying the honeycomb molded body before carrying out the step of flowing a drying gas. A step of forming a honeycomb molded body containing water, which is a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
A step of drying the honeycomb molded product by carrying out the drying method according to any one of claims 15 to 20;
The step of firing the dried honeycomb molded body and
A method for producing a baked honeycomb product including. A jig for drying a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
The inlet of the drying gas and
Drying gas outlet and
A tubular side wall extending from the inlet to the outlet,
First, which is arranged inside the side wall, has a V-groove portion extending from the inlet side toward the outlet side and contacting two adjacent side surfaces of the honeycomb molded body to suppress deformation of the honeycomb molded body. With orthodontic members
A V-groove portion that is arranged inside the side wall, extends from the inlet side toward the outlet side, and contacts the two side surfaces of the honeycomb molded body facing the two side surfaces to suppress deformation of the honeycomb molded body. The second orthodontic member provided and
When observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, one or both of the first straightening member and the second straightening member correspond to the diagonal dimension of the bottom surface of the honeycomb molded body. A movable mechanism for moving in the direction connecting the vertices of the V-grooves of both the first straightening member and the second straightening member,
A jig for drying. The drying jig according to claim 22, wherein only one of the first straightening member and the second straightening member is movable. The drying jig according to claim 22, wherein both the first straightening member and the second straightening member are movable. The drying according to any one of claims 22 to 24, wherein a plurality of sets of a first straightening member and a second straightening member for the honeycomb molded body are provided in parallel, and the plurality of sets of the honeycomb molded body can be accommodated. Jig. When the movable mechanism is observed from the extending direction of the V-groove portion of both the first straightening member and the second straightening member, the first straightening member and the first straightening member and the second straightening member correspond to the diagonal dimension of the bottom surface of the honeycomb molded body. (Ii) The drying jig according to claim 25, further comprising a movable portion that is independently movable in a direction connecting the vertices of both V-groove portions of the straightening member. The drying jig according to any one of claims 22 to 26, wherein the first straightening member is arranged on the upper side in the vertical direction and the second straightening member is arranged on the lower side in the vertical direction. In the drying jig according to any one of claims 22 to 27, the honeycomb molded body containing water is sandwiched between the first straightening member and the second straightening member, and from the inlet to the outlet. A method for drying a honeycomb molded product, which comprises a step of flowing a drying gas toward the body. The drying method according to claim 28, wherein the wind speed of the drying gas passing through the cells of the honeycomb molded body is 2 m / s or more. The drying method according to claim 28 or 29, wherein the temperature of the drying gas is 80 to 180 ° C. The drying method according to any one of claims 28 to 30, wherein the honeycomb molded body has a water content of 8% by mass to 72% by mass at the start of the step of flowing a drying gas. The drying method according to any one of claims 28 to 31, wherein the moisture content of the honeycomb molded product at the end of the step of flowing a drying gas is absolute drying of 0% by mass. The drying method according to any one of claims 28 to 32, which comprises a step of microwave-drying the honeycomb molded body before carrying out the step of flowing a drying gas. A step of forming a honeycomb molded body containing water, which is a square columnar honeycomb molded body having a plurality of cells extending from one bottom surface to the other bottom surface and serving as a fluid flow path.
A step of drying the honeycomb molded product by carrying out the drying method according to any one of claims 28 to 33.
The step of firing the dried honeycomb molded body and
A method for producing a baked honeycomb product including.